drivers/usb/gadget/amd5536udc.c

   1 /*
   2  * amd5536.c -- AMD 5536 UDC high/full speed USB device controller
   3  *
   4  * Copyright (C) 2005-2007 AMD (http://www.amd.com)
   5  * Author: Thomas Dahlmann
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  20  */
  21
  22 /*
  23  * The AMD5536 UDC is part of the x86 southbridge AMD Geode CS5536.
  24  * It is a USB Highspeed DMA capable USB device controller. Beside ep0 it
  25  * provides 4 IN and 4 OUT endpoints (bulk or interrupt type).
  26  *
  27  * Make sure that UDC is assigned to port 4 by BIOS settings (port can also
  28  * be used as host port) and UOC bits PAD_EN and APU are set (should be done
  29  * by BIOS init).
  30  *
  31  * UDC DMA requires 32-bit aligned buffers so DMA with gadget ether does not
  32  * work without updating NET_IP_ALIGN. Or PIO mode (module param "use_dma=0")
  33  * can be used with gadget ether.
  34  */
  35
  36 /* debug control */
  37 /* #define UDC_VERBOSE */
  38
  39 /* Driver strings */
  40 #define UDC_MOD_DESCRIPTION             "AMD 5536 UDC - USB Device Controller"
  41 #define UDC_DRIVER_VERSION_STRING       "01.00.0206 - $Revision: #3 $"
  42
  43 /* system */
  44 #include <linux/module.h>
  45 #include <linux/pci.h>
  46 #include <linux/kernel.h>
  47 #include <linux/delay.h>
  48 #include <linux/ioport.h>
  49 #include <linux/sched.h>
  50 #include <linux/slab.h>
  51 #include <linux/errno.h>
  52 #include <linux/init.h>
  53 #include <linux/timer.h>
  54 #include <linux/list.h>
  55 #include <linux/interrupt.h>
  56 #include <linux/ioctl.h>
  57 #include <linux/fs.h>
  58 #include <linux/dmapool.h>
  59 #include <linux/moduleparam.h>
  60 #include <linux/device.h>
  61 #include <linux/io.h>
  62 #include <linux/irq.h>
  63
  64 #include <asm/byteorder.h>
  65 #include <asm/system.h>
  66 #include <asm/unaligned.h>
  67
  68 /* gadget stack */
  69 #include <linux/usb/ch9.h>
  70 #include <linux/usb/gadget.h>
  71
  72 /* udc specific */
  73 #include "amd5536udc.h"
  74
  75
  76 static void udc_tasklet_disconnect(unsigned long);
  77 static void empty_req_queue(struct udc_ep *);
  78 static int udc_probe(struct udc *dev);
  79 static void udc_basic_init(struct udc *dev);
  80 static void udc_setup_endpoints(struct udc *dev);
  81 static void udc_soft_reset(struct udc *dev);
  82 static struct udc_request *udc_alloc_bna_dummy(struct udc_ep *ep);
  83 static void udc_free_request(struct usb_ep *usbep, struct usb_request *usbreq);
  84 static int udc_free_dma_chain(struct udc *dev, struct udc_request *req);
  85 static int udc_create_dma_chain(struct udc_ep *ep, struct udc_request *req,
  86                                 unsigned long buf_len, gfp_t gfp_flags);
  87 static int udc_remote_wakeup(struct udc *dev);
  88 static int udc_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id);
  89 static void udc_pci_remove(struct pci_dev *pdev);
  90
  91 /* description */
  92 static const char mod_desc[] = UDC_MOD_DESCRIPTION;
  93 static const char name[] = "amd5536udc";
  94
  95 /* structure to hold endpoint function pointers */
  96 static const struct usb_ep_ops udc_ep_ops;
  97
  98 /* received setup data */
  99 static union udc_setup_data setup_data;
 100
 101 /* pointer to device object */
 102 static struct udc *udc;
 103
 104 /* irq spin lock for soft reset */
 105 static DEFINE_SPINLOCK(udc_irq_spinlock);
 106 /* stall spin lock */
 107 static DEFINE_SPINLOCK(udc_stall_spinlock);
 108
 109 /*
 110 * slave mode: pending bytes in rx fifo after nyet,
 111 * used if EPIN irq came but no req was available
 112 */
 113 static unsigned int udc_rxfifo_pending;
 114
 115 /* count soft resets after suspend to avoid loop */
 116 static int soft_reset_occured;
 117 static int soft_reset_after_usbreset_occured;
 118
 119 /* timer */
 120 static struct timer_list udc_timer;
 121 static int stop_timer;
 122
 123 /* set_rde -- Is used to control enabling of RX DMA. Problem is
 124  * that UDC has only one bit (RDE) to enable/disable RX DMA for
 125  * all OUT endpoints. So we have to handle race conditions like
 126  * when OUT data reaches the fifo but no request was queued yet.
 127  * This cannot be solved by letting the RX DMA disabled until a
 128  * request gets queued because there may be other OUT packets
 129  * in the FIFO (important for not blocking control traffic).
 130  * The value of set_rde controls the correspondig timer.
 131  *
 132  * set_rde -1 == not used, means it is alloed to be set to 0 or 1
 133  * set_rde  0 == do not touch RDE, do no start the RDE timer
 134  * set_rde  1 == timer function will look whether FIFO has data
 135  * set_rde  2 == set by timer function to enable RX DMA on next call
 136  */
 137 static int set_rde = -1;
 138
 139 static DECLARE_COMPLETION(on_exit);
 140 static struct timer_list udc_pollstall_timer;
 141 static int stop_pollstall_timer;
 142 static DECLARE_COMPLETION(on_pollstall_exit);
 143
 144 /* tasklet for usb disconnect */
 145 static DECLARE_TASKLET(disconnect_tasklet, udc_tasklet_disconnect,
 146                 (unsigned long) &udc);
 147
 148
 149 /* endpoint names used for print */
 150 static const char ep0_string[] = "ep0in";
 151 static const char *ep_string[] = {
 152         ep0_string,
 153         "ep1in-int", "ep2in-bulk", "ep3in-bulk", "ep4in-bulk", "ep5in-bulk",
 154         "ep6in-bulk", "ep7in-bulk", "ep8in-bulk", "ep9in-bulk", "ep10in-bulk",
 155         "ep11in-bulk", "ep12in-bulk", "ep13in-bulk", "ep14in-bulk",
 156         "ep15in-bulk", "ep0out", "ep1out-bulk", "ep2out-bulk", "ep3out-bulk",
 157         "ep4out-bulk", "ep5out-bulk", "ep6out-bulk", "ep7out-bulk",
 158         "ep8out-bulk", "ep9out-bulk", "ep10out-bulk", "ep11out-bulk",
 159         "ep12out-bulk", "ep13out-bulk", "ep14out-bulk", "ep15out-bulk"
 160 };
 161
 162 /* DMA usage flag */
 163 static int use_dma = 1;
 164 /* packet per buffer dma */
 165 static int use_dma_ppb = 1;
 166 /* with per descr. update */
 167 static int use_dma_ppb_du;
 168 /* buffer fill mode */
 169 static int use_dma_bufferfill_mode;
 170 /* full speed only mode */
 171 static int use_fullspeed;
 172 /* tx buffer size for high speed */
 173 static unsigned long hs_tx_buf = UDC_EPIN_BUFF_SIZE;
 174
 175 /* module parameters */
 176 module_param(use_dma, bool, S_IRUGO);
 177 MODULE_PARM_DESC(use_dma, "true for DMA");
 178 module_param(use_dma_ppb, bool, S_IRUGO);
 179 MODULE_PARM_DESC(use_dma_ppb, "true for DMA in packet per buffer mode");
 180 module_param(use_dma_ppb_du, bool, S_IRUGO);
 181 MODULE_PARM_DESC(use_dma_ppb_du,
 182         "true for DMA in packet per buffer mode with descriptor update");
 183 module_param(use_fullspeed, bool, S_IRUGO);
 184 MODULE_PARM_DESC(use_fullspeed, "true for fullspeed only");
 185
 186 /*---------------------------------------------------------------------------*/
 187 /* Prints UDC device registers and endpoint irq registers */
 188 static void print_regs(struct udc *dev)
 189 {
 190         DBG(dev, "------- Device registers -------\n");
 191         DBG(dev, "dev config     = %08x\n", readl(&dev->regs->cfg));
 192         DBG(dev, "dev control    = %08x\n", readl(&dev->regs->ctl));
 193         DBG(dev, "dev status     = %08x\n", readl(&dev->regs->sts));
 194         DBG(dev, "\n");
 195         DBG(dev, "dev int's      = %08x\n", readl(&dev->regs->irqsts));
 196         DBG(dev, "dev intmask    = %08x\n", readl(&dev->regs->irqmsk));
 197         DBG(dev, "\n");
 198         DBG(dev, "dev ep int's   = %08x\n", readl(&dev->regs->ep_irqsts));
 199         DBG(dev, "dev ep intmask = %08x\n", readl(&dev->regs->ep_irqmsk));
 200         DBG(dev, "\n");
 201         DBG(dev, "USE DMA        = %d\n", use_dma);
 202         if (use_dma && use_dma_ppb && !use_dma_ppb_du) {
 203                 DBG(dev, "DMA mode       = PPBNDU (packet per buffer "
 204                         "WITHOUT desc. update)\n");
 205                 dev_info(&dev->pdev->dev, "DMA mode (%s)\n", "PPBNDU");
 206         } else if (use_dma && use_dma_ppb && use_dma_ppb_du) {
 207                 DBG(dev, "DMA mode       = PPBDU (packet per buffer "
 208                         "WITH desc. update)\n");
 209                 dev_info(&dev->pdev->dev, "DMA mode (%s)\n", "PPBDU");
 210         }
 211         if (use_dma && use_dma_bufferfill_mode) {
 212                 DBG(dev, "DMA mode       = BF (buffer fill mode)\n");
 213                 dev_info(&dev->pdev->dev, "DMA mode (%s)\n", "BF");
 214         }
 215         if (!use_dma) {
 216                 dev_info(&dev->pdev->dev, "FIFO mode\n");
 217         }
 218         DBG(dev, "-------------------------------------------------------\n");
 219 }
 220
 221 /* Masks unused interrupts */
 222 static int udc_mask_unused_interrupts(struct udc *dev)
 223 {
 224         u32 tmp;
 225
 226         /* mask all dev interrupts */
 227         tmp =   AMD_BIT(UDC_DEVINT_SVC) |
 228                 AMD_BIT(UDC_DEVINT_ENUM) |
 229                 AMD_BIT(UDC_DEVINT_US) |
 230                 AMD_BIT(UDC_DEVINT_UR) |
 231                 AMD_BIT(UDC_DEVINT_ES) |
 232                 AMD_BIT(UDC_DEVINT_SI) |
 233                 AMD_BIT(UDC_DEVINT_SOF)|
 234                 AMD_BIT(UDC_DEVINT_SC);
 235         writel(tmp, &dev->regs->irqmsk);
 236
 237         /* mask all ep interrupts */
 238         writel(UDC_EPINT_MSK_DISABLE_ALL, &dev->regs->ep_irqmsk);
 239
 240         return 0;
 241 }
 242
 243 /* Enables endpoint 0 interrupts */
 244 static int udc_enable_ep0_interrupts(struct udc *dev)
 245 {
 246         u32 tmp;
 247
 248         DBG(dev, "udc_enable_ep0_interrupts()\n");
 249
 250         /* read irq mask */
 251         tmp = readl(&dev->regs->ep_irqmsk);
 252         /* enable ep0 irq's */
 253         tmp &= AMD_UNMASK_BIT(UDC_EPINT_IN_EP0)
 254                 & AMD_UNMASK_BIT(UDC_EPINT_OUT_EP0);
 255         writel(tmp, &dev->regs->ep_irqmsk);
 256
 257         return 0;
 258 }
 259
 260 /* Enables device interrupts for SET_INTF and SET_CONFIG */
 261 static int udc_enable_dev_setup_interrupts(struct udc *dev)
 262 {
 263         u32 tmp;
 264
 265         DBG(dev, "enable device interrupts for setup data\n");
 266
 267         /* read irq mask */
 268         tmp = readl(&dev->regs->irqmsk);
 269
 270         /* enable SET_INTERFACE, SET_CONFIG and other needed irq's */
 271         tmp &= AMD_UNMASK_BIT(UDC_DEVINT_SI)
 272                 & AMD_UNMASK_BIT(UDC_DEVINT_SC)
 273                 & AMD_UNMASK_BIT(UDC_DEVINT_UR)
 274                 & AMD_UNMASK_BIT(UDC_DEVINT_SVC)
 275                 & AMD_UNMASK_BIT(UDC_DEVINT_ENUM);
 276         writel(tmp, &dev->regs->irqmsk);
 277
 278         return 0;
 279 }
 280
 281 /* Calculates fifo start of endpoint based on preceding endpoints */
 282 static int udc_set_txfifo_addr(struct udc_ep *ep)
 283 {
 284         struct udc      *dev;
 285         u32 tmp;
 286         int i;
 287
 288         if (!ep || !(ep->in))
 289                 return -EINVAL;
 290
 291         dev = ep->dev;
 292         ep->txfifo = dev->txfifo;
 293
 294         /* traverse ep's */
 295         for (i = 0; i < ep->num; i++) {
 296                 if (dev->ep[i].regs) {
 297                         /* read fifo size */
 298                         tmp = readl(&dev->ep[i].regs->bufin_framenum);
 299                         tmp = AMD_GETBITS(tmp, UDC_EPIN_BUFF_SIZE);
 300                         ep->txfifo += tmp;
 301                 }
 302         }
 303         return 0;
 304 }
 305
 306 /* CNAK pending field: bit0 = ep0in, bit16 = ep0out */
 307 static u32 cnak_pending;
 308
 309 static void UDC_QUEUE_CNAK(struct udc_ep *ep, unsigned num)
 310 {
 311         if (readl(&ep->regs->ctl) & AMD_BIT(UDC_EPCTL_NAK)) {
 312                 DBG(ep->dev, "NAK could not be cleared for ep%d\n", num);
 313                 cnak_pending |= 1 << (num);
 314                 ep->naking = 1;
 315         } else
 316                 cnak_pending = cnak_pending & (~(1 << (num)));
 317 }
 318
 319
 320 /* Enables endpoint, is called by gadget driver */
 321 static int
 322 udc_ep_enable(struct usb_ep *usbep, const struct usb_endpoint_descriptor *desc)
 323 {
 324         struct udc_ep           *ep;
 325         struct udc              *dev;
 326         u32                     tmp;
 327         unsigned long           iflags;
 328         u8 udc_csr_epix;
 329         unsigned                maxpacket;
 330
 331         if (!usbep
 332                         || usbep->name == ep0_string
 333                         || !desc
 334                         || desc->bDescriptorType != USB_DT_ENDPOINT)
 335                 return -EINVAL;
 336
 337         ep = container_of(usbep, struct udc_ep, ep);
 338         dev = ep->dev;
 339
 340         DBG(dev, "udc_ep_enable() ep %d\n", ep->num);
 341
 342         if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN)
 343                 return -ESHUTDOWN;
 344
 345         spin_lock_irqsave(&dev->lock, iflags);
 346         ep->desc = desc;
 347
 348         ep->halted = 0;
 349
 350         /* set traffic type */
 351         tmp = readl(&dev->ep[ep->num].regs->ctl);
 352         tmp = AMD_ADDBITS(tmp, desc->bmAttributes, UDC_EPCTL_ET);
 353         writel(tmp, &dev->ep[ep->num].regs->ctl);
 354
 355         /* set max packet size */
 356         maxpacket = le16_to_cpu(desc->wMaxPacketSize);
 357         tmp = readl(&dev->ep[ep->num].regs->bufout_maxpkt);
 358         tmp = AMD_ADDBITS(tmp, maxpacket, UDC_EP_MAX_PKT_SIZE);
 359         ep->ep.maxpacket = maxpacket;
 360         writel(tmp, &dev->ep[ep->num].regs->bufout_maxpkt);
 361
 362         /* IN ep */
 363         if (ep->in) {
 364
 365                 /* ep ix in UDC CSR register space */
 366                 udc_csr_epix = ep->num;
 367
 368                 /* set buffer size (tx fifo entries) */
 369                 tmp = readl(&dev->ep[ep->num].regs->bufin_framenum);
 370                 /* double buffering: fifo size = 2 x max packet size */
 371                 tmp = AMD_ADDBITS(
 372                                 tmp,
 373                                 maxpacket * UDC_EPIN_BUFF_SIZE_MULT
 374                                           / UDC_DWORD_BYTES,
 375                                 UDC_EPIN_BUFF_SIZE);
 376                 writel(tmp, &dev->ep[ep->num].regs->bufin_framenum);
 377
 378                 /* calc. tx fifo base addr */
 379                 udc_set_txfifo_addr(ep);
 380
 381                 /* flush fifo */
 382                 tmp = readl(&ep->regs->ctl);
 383                 tmp |= AMD_BIT(UDC_EPCTL_F);
 384                 writel(tmp, &ep->regs->ctl);
 385
 386         /* OUT ep */
 387         } else {
 388                 /* ep ix in UDC CSR register space */
 389                 udc_csr_epix = ep->num - UDC_CSR_EP_OUT_IX_OFS;
 390
 391                 /* set max packet size UDC CSR  */
 392                 tmp = readl(&dev->csr->ne[ep->num - UDC_CSR_EP_OUT_IX_OFS]);
 393                 tmp = AMD_ADDBITS(tmp, maxpacket,
 394                                         UDC_CSR_NE_MAX_PKT);
 395                 writel(tmp, &dev->csr->ne[ep->num - UDC_CSR_EP_OUT_IX_OFS]);
 396
 397                 if (use_dma && !ep->in) {
 398                         /* alloc and init BNA dummy request */
 399                         ep->bna_dummy_req = udc_alloc_bna_dummy(ep);
 400                         ep->bna_occurred = 0;
 401                 }
 402
 403                 if (ep->num != UDC_EP0OUT_IX)
 404                         dev->data_ep_enabled = 1;
 405         }
 406
 407         /* set ep values */
 408         tmp = readl(&dev->csr->ne[udc_csr_epix]);
 409         /* max packet */
 410         tmp = AMD_ADDBITS(tmp, maxpacket, UDC_CSR_NE_MAX_PKT);
 411         /* ep number */
 412         tmp = AMD_ADDBITS(tmp, desc->bEndpointAddress, UDC_CSR_NE_NUM);
 413         /* ep direction */
 414         tmp = AMD_ADDBITS(tmp, ep->in, UDC_CSR_NE_DIR);
 415         /* ep type */
 416         tmp = AMD_ADDBITS(tmp, desc->bmAttributes, UDC_CSR_NE_TYPE);
 417         /* ep config */
 418         tmp = AMD_ADDBITS(tmp, ep->dev->cur_config, UDC_CSR_NE_CFG);
 419         /* ep interface */
 420         tmp = AMD_ADDBITS(tmp, ep->dev->cur_intf, UDC_CSR_NE_INTF);
 421         /* ep alt */
 422         tmp = AMD_ADDBITS(tmp, ep->dev->cur_alt, UDC_CSR_NE_ALT);
 423         /* write reg */
 424         writel(tmp, &dev->csr->ne[udc_csr_epix]);
 425
 426         /* enable ep irq */
 427         tmp = readl(&dev->regs->ep_irqmsk);
 428         tmp &= AMD_UNMASK_BIT(ep->num);
 429         writel(tmp, &dev->regs->ep_irqmsk);
 430
 431         /*
 432          * clear NAK by writing CNAK
 433          * avoid BNA for OUT DMA, don't clear NAK until DMA desc. written
 434          */
 435         if (!use_dma || ep->in) {
 436                 tmp = readl(&ep->regs->ctl);
 437                 tmp |= AMD_BIT(UDC_EPCTL_CNAK);
 438                 writel(tmp, &ep->regs->ctl);
 439                 ep->naking = 0;
 440                 UDC_QUEUE_CNAK(ep, ep->num);
 441         }
 442         tmp = desc->bEndpointAddress;
 443         DBG(dev, "%s enabled\n", usbep->name);
 444
 445         spin_unlock_irqrestore(&dev->lock, iflags);
 446         return 0;
 447 }
 448
 449 /* Resets endpoint */
 450 static void ep_init(struct udc_regs __iomem *regs, struct udc_ep *ep)
 451 {
 452         u32             tmp;
 453
 454         VDBG(ep->dev, "ep-%d reset\n", ep->num);
 455         ep->desc = NULL;
 456         ep->ep.ops = &udc_ep_ops;
 457         INIT_LIST_HEAD(&ep->queue);
 458
 459         ep->ep.maxpacket = (u16) ~0;
 460         /* set NAK */
 461         tmp = readl(&ep->regs->ctl);
 462         tmp |= AMD_BIT(UDC_EPCTL_SNAK);
 463         writel(tmp, &ep->regs->ctl);
 464         ep->naking = 1;
 465
 466         /* disable interrupt */
 467         tmp = readl(&regs->ep_irqmsk);
 468         tmp |= AMD_BIT(ep->num);
 469         writel(tmp, &regs->ep_irqmsk);
 470
 471         if (ep->in) {
 472                 /* unset P and IN bit of potential former DMA */
 473                 tmp = readl(&ep->regs->ctl);
 474                 tmp &= AMD_UNMASK_BIT(UDC_EPCTL_P);
 475                 writel(tmp, &ep->regs->ctl);
 476
 477                 tmp = readl(&ep->regs->sts);
 478                 tmp |= AMD_BIT(UDC_EPSTS_IN);
 479                 writel(tmp, &ep->regs->sts);
 480
 481                 /* flush the fifo */
 482                 tmp = readl(&ep->regs->ctl);
 483                 tmp |= AMD_BIT(UDC_EPCTL_F);
 484                 writel(tmp, &ep->regs->ctl);
 485
 486         }
 487         /* reset desc pointer */
 488         writel(0, &ep->regs->desptr);
 489 }
 490
 491 /* Disables endpoint, is called by gadget driver */
 492 static int udc_ep_disable(struct usb_ep *usbep)
 493 {
 494         struct udc_ep   *ep = NULL;
 495         unsigned long   iflags;
 496
 497         if (!usbep)
 498                 return -EINVAL;
 499
 500         ep = container_of(usbep, struct udc_ep, ep);
 501         if (usbep->name == ep0_string || !ep->desc)
 502                 return -EINVAL;
 503
 504         DBG(ep->dev, "Disable ep-%d\n", ep->num);
 505
 506         spin_lock_irqsave(&ep->dev->lock, iflags);
 507         udc_free_request(&ep->ep, &ep->bna_dummy_req->req);
 508         empty_req_queue(ep);
 509         ep_init(ep->dev->regs, ep);
 510         spin_unlock_irqrestore(&ep->dev->lock, iflags);
 511
 512         return 0;
 513 }
 514
 515 /* Allocates request packet, called by gadget driver */
 516 static struct usb_request *
 517 udc_alloc_request(struct usb_ep *usbep, gfp_t gfp)
 518 {
 519         struct udc_request      *req;
 520         struct udc_data_dma     *dma_desc;
 521         struct udc_ep   *ep;
 522
 523         if (!usbep)
 524                 return NULL;
 525
 526         ep = container_of(usbep, struct udc_ep, ep);
 527
 528         VDBG(ep->dev, "udc_alloc_req(): ep%d\n", ep->num);
 529         req = kzalloc(sizeof(struct udc_request), gfp);
 530         if (!req)
 531                 return NULL;
 532
 533         req->req.dma = DMA_DONT_USE;
 534         INIT_LIST_HEAD(&req->queue);
 535
 536         if (ep->dma) {
 537                 /* ep0 in requests are allocated from data pool here */
 538                 dma_desc = pci_pool_alloc(ep->dev->data_requests, gfp,
 539                                                 &req->td_phys);
 540                 if (!dma_desc) {
 541                         kfree(req);
 542                         return NULL;
 543                 }
 544
 545                 VDBG(ep->dev, "udc_alloc_req: req = %p dma_desc = %p, "
 546                                 "td_phys = %lx\n",
 547                                 req, dma_desc,
 548                                 (unsigned long)req->td_phys);
 549                 /* prevent from using desc. - set HOST BUSY */
 550                 dma_desc->status = AMD_ADDBITS(dma_desc->status,
 551                                                 UDC_DMA_STP_STS_BS_HOST_BUSY,
 552                                                 UDC_DMA_STP_STS_BS);
 553                 dma_desc->bufptr = cpu_to_le32(DMA_DONT_USE);
 554                 req->td_data = dma_desc;
 555                 req->td_data_last = NULL;
 556                 req->chain_len = 1;
 557         }
 558
 559         return &req->req;
 560 }
 561
 562 /* Frees request packet, called by gadget driver */
 563 static void
 564 udc_free_request(struct usb_ep *usbep, struct usb_request *usbreq)
 565 {
 566         struct udc_ep   *ep;
 567         struct udc_request      *req;
 568
 569         if (!usbep || !usbreq)
 570                 return;
 571
 572         ep = container_of(usbep, struct udc_ep, ep);
 573         req = container_of(usbreq, struct udc_request, req);
 574         VDBG(ep->dev, "free_req req=%p\n", req);
 575         BUG_ON(!list_empty(&req->queue));
 576         if (req->td_data) {
 577                 VDBG(ep->dev, "req->td_data=%p\n", req->td_data);
 578
 579                 /* free dma chain if created */
 580                 if (req->chain_len > 1) {
 581                         udc_free_dma_chain(ep->dev, req);
 582                 }
 583
 584                 pci_pool_free(ep->dev->data_requests, req->td_data,
 585                                                         req->td_phys);
 586         }
 587         kfree(req);
 588 }
 589
 590 /* Init BNA dummy descriptor for HOST BUSY and pointing to itself */
 591 static void udc_init_bna_dummy(struct udc_request *req)
 592 {
 593         if (req) {
 594                 /* set last bit */
 595                 req->td_data->status |= AMD_BIT(UDC_DMA_IN_STS_L);
 596                 /* set next pointer to itself */
 597                 req->td_data->next = req->td_phys;
 598                 /* set HOST BUSY */
 599                 req->td_data->status
 600                         = AMD_ADDBITS(req->td_data->status,
 601                                         UDC_DMA_STP_STS_BS_DMA_DONE,
 602                                         UDC_DMA_STP_STS_BS);
 603 #ifdef UDC_VERBOSE
 604                 pr_debug("bna desc = %p, sts = %08x\n",
 605                         req->td_data, req->td_data->status);
 606 #endif
 607         }
 608 }
 609
 610 /* Allocate BNA dummy descriptor */
 611 static struct udc_request *udc_alloc_bna_dummy(struct udc_ep *ep)
 612 {
 613         struct udc_request *req = NULL;
 614         struct usb_request *_req = NULL;
 615
 616         /* alloc the dummy request */
 617         _req = udc_alloc_request(&ep->ep, GFP_ATOMIC);
 618         if (_req) {
 619                 req = container_of(_req, struct udc_request, req);
 620                 ep->bna_dummy_req = req;
 621                 udc_init_bna_dummy(req);
 622         }
 623         return req;
 624 }
 625
 626 /* Write data to TX fifo for IN packets */
 627 static void
 628 udc_txfifo_write(struct udc_ep *ep, struct usb_request *req)
 629 {
 630         u8                      *req_buf;
 631         u32                     *buf;
 632         int                     i, j;
 633         unsigned                bytes = 0;
 634         unsigned                remaining = 0;
 635
 636         if (!req || !ep)
 637                 return;
 638
 639         req_buf = req->buf + req->actual;
 640         prefetch(req_buf);
 641         remaining = req->length - req->actual;
 642
 643         buf = (u32 *) req_buf;
 644
 645         bytes = ep->ep.maxpacket;
 646         if (bytes > remaining)
 647                 bytes = remaining;
 648
 649         /* dwords first */
 650         for (i = 0; i < bytes / UDC_DWORD_BYTES; i++) {
 651                 writel(*(buf + i), ep->txfifo);
 652         }
 653
 654         /* remaining bytes must be written by byte access */
 655         for (j = 0; j < bytes % UDC_DWORD_BYTES; j++) {
 656                 writeb((u8)(*(buf + i) >> (j << UDC_BITS_PER_BYTE_SHIFT)),
 657                                                         ep->txfifo);
 658         }
 659
 660         /* dummy write confirm */
 661         writel(0, &ep->regs->confirm);
 662 }
 663
 664 /* Read dwords from RX fifo for OUT transfers */
 665 static int udc_rxfifo_read_dwords(struct udc *dev, u32 *buf, int dwords)
 666 {
 667         int i;
 668
 669         VDBG(dev, "udc_read_dwords(): %d dwords\n", dwords);
 670
 671         for (i = 0; i < dwords; i++) {
 672                 *(buf + i) = readl(dev->rxfifo);
 673         }
 674         return 0;
 675 }
 676
 677 /* Read bytes from RX fifo for OUT transfers */
 678 static int udc_rxfifo_read_bytes(struct udc *dev, u8 *buf, int bytes)
 679 {
 680         int i, j;
 681         u32 tmp;
 682
 683         VDBG(dev, "udc_read_bytes(): %d bytes\n", bytes);
 684
 685         /* dwords first */
 686         for (i = 0; i < bytes / UDC_DWORD_BYTES; i++) {
 687                 *((u32 *)(buf + (i<<2))) = readl(dev->rxfifo);
 688         }
 689
 690         /* remaining bytes must be read by byte access */
 691         if (bytes % UDC_DWORD_BYTES) {
 692                 tmp = readl(dev->rxfifo);
 693                 for (j = 0; j < bytes % UDC_DWORD_BYTES; j++) {
 694                         *(buf + (i<<2) + j) = (u8)(tmp & UDC_BYTE_MASK);
 695                         tmp = tmp >> UDC_BITS_PER_BYTE;
 696                 }
 697         }
 698
 699         return 0;
 700 }
 701
 702 /* Read data from RX fifo for OUT transfers */
 703 static int
 704 udc_rxfifo_read(struct udc_ep *ep, struct udc_request *req)
 705 {
 706         u8 *buf;
 707         unsigned buf_space;
 708         unsigned bytes = 0;
 709         unsigned finished = 0;
 710
 711         /* received number bytes */
 712         bytes = readl(&ep->regs->sts);
 713         bytes = AMD_GETBITS(bytes, UDC_EPSTS_RX_PKT_SIZE);
 714
 715         buf_space = req->req.length - req->req.actual;
 716         buf = req->req.buf + req->req.actual;
 717         if (bytes > buf_space) {
 718                 if ((buf_space % ep->ep.maxpacket) != 0) {
 719                         DBG(ep->dev,
 720                                 "%s: rx %d bytes, rx-buf space = %d bytesn\n",
 721                                 ep->ep.name, bytes, buf_space);
 722                         req->req.status = -EOVERFLOW;
 723                 }
 724                 bytes = buf_space;
 725         }
 726         req->req.actual += bytes;
 727
 728         /* last packet ? */
 729         if (((bytes % ep->ep.maxpacket) != 0) || (!bytes)
 730                 || ((req->req.actual == req->req.length) && !req->req.zero))
 731                 finished = 1;
 732
 733         /* read rx fifo bytes */
 734         VDBG(ep->dev, "ep %s: rxfifo read %d bytes\n", ep->ep.name, bytes);
 735         udc_rxfifo_read_bytes(ep->dev, buf, bytes);
 736
 737         return finished;
 738 }
 739
 740 /* create/re-init a DMA descriptor or a DMA descriptor chain */
 741 static int prep_dma(struct udc_ep *ep, struct udc_request *req, gfp_t gfp)
 742 {
 743         int     retval = 0;
 744         u32     tmp;
 745
 746         VDBG(ep->dev, "prep_dma\n");
 747         VDBG(ep->dev, "prep_dma ep%d req->td_data=%p\n",
 748                         ep->num, req->td_data);
 749
 750         /* set buffer pointer */
 751         req->td_data->bufptr = req->req.dma;
 752
 753         /* set last bit */
 754         req->td_data->status |= AMD_BIT(UDC_DMA_IN_STS_L);
 755
 756         /* build/re-init dma chain if maxpkt scatter mode, not for EP0 */
 757         if (use_dma_ppb) {
 758
 759                 retval = udc_create_dma_chain(ep, req, ep->ep.maxpacket, gfp);
 760                 if (retval != 0) {
 761                         if (retval == -ENOMEM)
 762                                 DBG(ep->dev, "Out of DMA memory\n");
 763                         return retval;
 764                 }
 765                 if (ep->in) {
 766                         if (req->req.length == ep->ep.maxpacket) {
 767                                 /* write tx bytes */
 768                                 req->td_data->status =
 769                                         AMD_ADDBITS(req->td_data->status,
 770                                                 ep->ep.maxpacket,
 771                                                 UDC_DMA_IN_STS_TXBYTES);
 772
 773                         }
 774                 }
 775
 776         }
 777
 778         if (ep->in) {
 779                 VDBG(ep->dev, "IN: use_dma_ppb=%d req->req.len=%d "
 780                                 "maxpacket=%d ep%d\n",
 781                                 use_dma_ppb, req->req.length,
 782                                 ep->ep.maxpacket, ep->num);
 783                 /*
 784                  * if bytes < max packet then tx bytes must
 785                  * be written in packet per buffer mode
 786                  */
 787                 if (!use_dma_ppb || req->req.length < ep->ep.maxpacket
 788                                 || ep->num == UDC_EP0OUT_IX
 789                                 || ep->num == UDC_EP0IN_IX) {
 790                         /* write tx bytes */
 791                         req->td_data->status =
 792                                 AMD_ADDBITS(req->td_data->status,
 793                                                 req->req.length,
 794                                                 UDC_DMA_IN_STS_TXBYTES);
 795                         /* reset frame num */
 796                         req->td_data->status =
 797                                 AMD_ADDBITS(req->td_data->status,
 798                                                 0,
 799                                                 UDC_DMA_IN_STS_FRAMENUM);
 800                 }
 801                 /* set HOST BUSY */
 802                 req->td_data->status =
 803                         AMD_ADDBITS(req->td_data->status,
 804                                 UDC_DMA_STP_STS_BS_HOST_BUSY,
 805                                 UDC_DMA_STP_STS_BS);
 806         } else {
 807                 VDBG(ep->dev, "OUT set host ready\n");
 808                 /* set HOST READY */
 809                 req->td_data->status =
 810                         AMD_ADDBITS(req->td_data->status,
 811                                 UDC_DMA_STP_STS_BS_HOST_READY,
 812                                 UDC_DMA_STP_STS_BS);
 813
 814
 815                         /* clear NAK by writing CNAK */
 816                         if (ep->naking) {
 817                                 tmp = readl(&ep->regs->ctl);
 818                                 tmp |= AMD_BIT(UDC_EPCTL_CNAK);
 819                                 writel(tmp, &ep->regs->ctl);
 820                                 ep->naking = 0;
 821                                 UDC_QUEUE_CNAK(ep, ep->num);
 822                         }
 823
 824         }
 825
 826         return retval;
 827 }
 828
 829 /* Completes request packet ... caller MUST hold lock */
 830 static void
 831 complete_req(struct udc_ep *ep, struct udc_request *req, int sts)
 832 __releases(ep->dev->lock)
 833 __acquires(ep->dev->lock)
 834 {
 835         struct udc              *dev;
 836         unsigned                halted;
 837
 838         VDBG(ep->dev, "complete_req(): ep%d\n", ep->num);
 839
 840         dev = ep->dev;
 841         /* unmap DMA */
 842         if (req->dma_mapping) {
 843                 if (ep->in)
 844                         pci_unmap_single(dev->pdev,
 845                                         req->req.dma,
 846                                         req->req.length,
 847                                         PCI_DMA_TODEVICE);
 848                 else
 849                         pci_unmap_single(dev->pdev,
 850                                         req->req.dma,
 851                                         req->req.length,
 852                                         PCI_DMA_FROMDEVICE);
 853                 req->dma_mapping = 0;
 854                 req->req.dma = DMA_DONT_USE;
 855         }
 856
 857         halted = ep->halted;
 858         ep->halted = 1;
 859
 860         /* set new status if pending */
 861         if (req->req.status == -EINPROGRESS)
 862                 req->req.status = sts;
 863
 864         /* remove from ep queue */
 865         list_del_init(&req->queue);
 866
 867         VDBG(ep->dev, "req %p => complete %d bytes at %s with sts %d\n",
 868                 &req->req, req->req.length, ep->ep.name, sts);
 869
 870         spin_unlock(&dev->lock);
 871         req->req.complete(&ep->ep, &req->req);
 872         spin_lock(&dev->lock);
 873         ep->halted = halted;
 874 }
 875
 876 /* frees pci pool descriptors of a DMA chain */
 877 static int udc_free_dma_chain(struct udc *dev, struct udc_request *req)
 878 {
 879
 880         int ret_val = 0;
 881         struct udc_data_dma     *td;
 882         struct udc_data_dma     *td_last = NULL;
 883         unsigned int i;
 884
 885         DBG(dev, "free chain req = %p\n", req);
 886
 887         /* do not free first desc., will be done by free for request */
 888         td_last = req->td_data;
 889         td = phys_to_virt(td_last->next);
 890
 891         for (i = 1; i < req->chain_len; i++) {
 892
 893                 pci_pool_free(dev->data_requests, td,
 894                                 (dma_addr_t) td_last->next);
 895                 td_last = td;
 896                 td = phys_to_virt(td_last->next);
 897         }
 898
 899         return ret_val;
 900 }
 901
 902 /* Iterates to the end of a DMA chain and returns last descriptor */
 903 static struct udc_data_dma *udc_get_last_dma_desc(struct udc_request *req)
 904 {
 905         struct udc_data_dma     *td;
 906
 907         td = req->td_data;
 908         while (td && !(td->status & AMD_BIT(UDC_DMA_IN_STS_L))) {
 909                 td = phys_to_virt(td->next);
 910         }
 911
 912         return td;
 913
 914 }
 915
 916 /* Iterates to the end of a DMA chain and counts bytes received */
 917 static u32 udc_get_ppbdu_rxbytes(struct udc_request *req)
 918 {
 919         struct udc_data_dma     *td;
 920         u32 count;
 921
 922         td = req->td_data;
 923         /* received number bytes */
 924         count = AMD_GETBITS(td->status, UDC_DMA_OUT_STS_RXBYTES);
 925
 926         while (td && !(td->status & AMD_BIT(UDC_DMA_IN_STS_L))) {
 927                 td = phys_to_virt(td->next);
 928                 /* received number bytes */
 929                 if (td) {
 930                         count += AMD_GETBITS(td->status,
 931                                 UDC_DMA_OUT_STS_RXBYTES);
 932                 }
 933         }
 934
 935         return count;
 936
 937 }
 938
 939 /* Creates or re-inits a DMA chain */
 940 static int udc_create_dma_chain(
 941         struct udc_ep *ep,
 942         struct udc_request *req,
 943         unsigned long buf_len, gfp_t gfp_flags
 944 )
 945 {
 946         unsigned long bytes = req->req.length;
 947         unsigned int i;
 948         dma_addr_t dma_addr;
 949         struct udc_data_dma     *td = NULL;
 950         struct udc_data_dma     *last = NULL;
 951         unsigned long txbytes;
 952         unsigned create_new_chain = 0;
 953         unsigned len;
 954
 955         VDBG(ep->dev, "udc_create_dma_chain: bytes=%ld buf_len=%ld\n",
 956                         bytes, buf_len);
 957         dma_addr = DMA_DONT_USE;
 958
 959         /* unset L bit in first desc for OUT */
 960         if (!ep->in) {
 961                 req->td_data->status &= AMD_CLEAR_BIT(UDC_DMA_IN_STS_L);
 962         }
 963
 964         /* alloc only new desc's if not already available */
 965         len = req->req.length / ep->ep.maxpacket;
 966         if (req->req.length % ep->ep.maxpacket) {
 967                 len++;
 968         }
 969
 970         if (len > req->chain_len) {
 971                 /* shorter chain already allocated before */
 972                 if (req->chain_len > 1) {
 973                         udc_free_dma_chain(ep->dev, req);
 974                 }
 975                 req->chain_len = len;
 976                 create_new_chain = 1;
 977         }
 978
 979         td = req->td_data;
 980         /* gen. required number of descriptors and buffers */
 981         for (i = buf_len; i < bytes; i += buf_len) {
 982                 /* create or determine next desc. */
 983                 if (create_new_chain) {
 984
 985                         td = pci_pool_alloc(ep->dev->data_requests,
 986                                         gfp_flags, &dma_addr);
 987                         if (!td)
 988                                 return -ENOMEM;
 989
 990                         td->status = 0;
 991                 } else if (i == buf_len) {
 992                         /* first td */
 993                         td = (struct udc_data_dma *) phys_to_virt(
 994                                                 req->td_data->next);
 995                         td->status = 0;
 996                 } else {
 997                         td = (struct udc_data_dma *) phys_to_virt(last->next);
 998                         td->status = 0;
 999                 }
1000
1001
1002                 if (td)
1003                         td->bufptr = req->req.dma + i; /* assign buffer */
1004                 else
1005                         break;
1006
1007                 /* short packet ? */
1008                 if ((bytes - i) >= buf_len) {
1009                         txbytes = buf_len;
1010                 } else {
1011                         /* short packet */
1012                         txbytes = bytes - i;
1013                 }
1014
1015                 /* link td and assign tx bytes */
1016                 if (i == buf_len) {
1017                         if (create_new_chain) {
1018                                 req->td_data->next = dma_addr;
1019                         } else {
1020                                 /* req->td_data->next = virt_to_phys(td); */
1021                         }
1022                         /* write tx bytes */
1023                         if (ep->in) {
1024                                 /* first desc */
1025                                 req->td_data->status =
1026                                         AMD_ADDBITS(req->td_data->status,
1027                                                         ep->ep.maxpacket,
1028                                                         UDC_DMA_IN_STS_TXBYTES);
1029                                 /* second desc */
1030                                 td->status = AMD_ADDBITS(td->status,
1031                                                         txbytes,
1032                                                         UDC_DMA_IN_STS_TXBYTES);
1033                         }
1034                 } else {
1035                         if (create_new_chain) {
1036                                 last->next = dma_addr;
1037                         } else {
1038                                 /* last->next = virt_to_phys(td); */
1039                         }
1040                         if (ep->in) {
1041                                 /* write tx bytes */
1042                                 td->status = AMD_ADDBITS(td->status,
1043                                                         txbytes,
1044                                                         UDC_DMA_IN_STS_TXBYTES);
1045                         }
1046                 }
1047                 last = td;
1048         }
1049         /* set last bit */
1050         if (td) {
1051                 td->status |= AMD_BIT(UDC_DMA_IN_STS_L);
1052                 /* last desc. points to itself */
1053                 req->td_data_last = td;
1054         }
1055
1056         return 0;
1057 }
1058
1059 /* Enabling RX DMA */
1060 static void udc_set_rde(struct udc *dev)
1061 {
1062         u32 tmp;
1063
1064         VDBG(dev, "udc_set_rde()\n");
1065         /* stop RDE timer */
1066         if (timer_pending(&udc_timer)) {
1067                 set_rde = 0;
1068                 mod_timer(&udc_timer, jiffies - 1);
1069         }
1070         /* set RDE */
1071         tmp = readl(&dev->regs->ctl);
1072         tmp |= AMD_BIT(UDC_DEVCTL_RDE);
1073         writel(tmp, &dev->regs->ctl);
1074 }
1075
1076 /* Queues a request packet, called by gadget driver */
1077 static int
1078 udc_queue(struct usb_ep *usbep, struct usb_request *usbreq, gfp_t gfp)
1079 {
1080         int                     retval = 0;
1081         u8                      open_rxfifo = 0;
1082         unsigned long           iflags;
1083         struct udc_ep           *ep;
1084         struct udc_request      *req;
1085         struct udc              *dev;
1086         u32                     tmp;
1087
1088         /* check the inputs */
1089         req = container_of(usbreq, struct udc_request, req);
1090
1091         if (!usbep || !usbreq || !usbreq->complete || !usbreq->buf
1092                         || !list_empty(&req->queue))
1093                 return -EINVAL;
1094
1095         ep = container_of(usbep, struct udc_ep, ep);
1096         if (!ep->desc && (ep->num != 0 && ep->num != UDC_EP0OUT_IX))
1097                 return -EINVAL;
1098
1099         VDBG(ep->dev, "udc_queue(): ep%d-in=%d\n", ep->num, ep->in);
1100         dev = ep->dev;
1101
1102         if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN)
1103                 return -ESHUTDOWN;
1104
1105         /* map dma (usually done before) */
1106         if (ep->dma && usbreq->length != 0
1107                         && (usbreq->dma == DMA_DONT_USE || usbreq->dma == 0)) {
1108                 VDBG(dev, "DMA map req %p\n", req);
1109                 if (ep->in)
1110                         usbreq->dma = pci_map_single(dev->pdev,
1111                                                 usbreq->buf,
1112                                                 usbreq->length,
1113                                                 PCI_DMA_TODEVICE);
1114                 else
1115                         usbreq->dma = pci_map_single(dev->pdev,
1116                                                 usbreq->buf,
1117                                                 usbreq->length,
1118                                                 PCI_DMA_FROMDEVICE);
1119                 req->dma_mapping = 1;
1120         }
1121
1122         VDBG(dev, "%s queue req %p, len %d req->td_data=%p buf %p\n",
1123                         usbep->name, usbreq, usbreq->length,
1124                         req->td_data, usbreq->buf);
1125
1126         spin_lock_irqsave(&dev->lock, iflags);
1127         usbreq->actual = 0;
1128         usbreq->status = -EINPROGRESS;
1129         req->dma_done = 0;
1130
1131         /* on empty queue just do first transfer */
1132         if (list_empty(&ep->queue)) {
1133                 /* zlp */
1134                 if (usbreq->length == 0) {
1135                         /* IN zlp's are handled by hardware */
1136                         complete_req(ep, req, 0);
1137                         VDBG(dev, "%s: zlp\n", ep->ep.name);
1138                         /*
1139                          * if set_config or set_intf is waiting for ack by zlp
1140                          * then set CSR_DONE
1141                          */
1142                         if (dev->set_cfg_not_acked) {
1143                                 tmp = readl(&dev->regs->ctl);
1144                                 tmp |= AMD_BIT(UDC_DEVCTL_CSR_DONE);
1145                                 writel(tmp, &dev->regs->ctl);
1146                                 dev->set_cfg_not_acked = 0;
1147                         }
1148                         /* setup command is ACK'ed now by zlp */
1149                         if (dev->waiting_zlp_ack_ep0in) {
1150                                 /* clear NAK by writing CNAK in EP0_IN */
1151                                 tmp = readl(&dev->ep[UDC_EP0IN_IX].regs->ctl);
1152                                 tmp |= AMD_BIT(UDC_EPCTL_CNAK);
1153                                 writel(tmp, &dev->ep[UDC_EP0IN_IX].regs->ctl);
1154                                 dev->ep[UDC_EP0IN_IX].naking = 0;
1155                                 UDC_QUEUE_CNAK(&dev->ep[UDC_EP0IN_IX],
1156                                                         UDC_EP0IN_IX);
1157                                 dev->waiting_zlp_ack_ep0in = 0;
1158                         }
1159                         goto finished;
1160                 }
1161                 if (ep->dma) {
1162                         retval = prep_dma(ep, req, gfp);
1163                         if (retval != 0)
1164                                 goto finished;
1165                         /* write desc pointer to enable DMA */
1166                         if (ep->in) {
1167                                 /* set HOST READY */
1168                                 req->td_data->status =
1169                                         AMD_ADDBITS(req->td_data->status,
1170                                                 UDC_DMA_IN_STS_BS_HOST_READY,
1171                                                 UDC_DMA_IN_STS_BS);
1172                         }
1173
1174                         /* disabled rx dma while descriptor update */
1175                         if (!ep->in) {
1176                                 /* stop RDE timer */
1177                                 if (timer_pending(&udc_timer)) {
1178                                         set_rde = 0;
1179                                         mod_timer(&udc_timer, jiffies - 1);
1180                                 }
1181                                 /* clear RDE */
1182                                 tmp = readl(&dev->regs->ctl);
1183                                 tmp &= AMD_UNMASK_BIT(UDC_DEVCTL_RDE);
1184                                 writel(tmp, &dev->regs->ctl);
1185                                 open_rxfifo = 1;
1186
1187                                 /*
1188                                  * if BNA occurred then let BNA dummy desc.
1189                                  * point to current desc.
1190                                  */
1191                                 if (ep->bna_occurred) {
1192                                         VDBG(dev, "copy to BNA dummy desc.\n");
1193                                         memcpy(ep->bna_dummy_req->td_data,
1194                                                 req->td_data,
1195                                                 sizeof(struct udc_data_dma));
1196                                 }
1197                         }
1198                         /* write desc pointer */
1199                         writel(req->td_phys, &ep->regs->desptr);
1200
1201                         /* clear NAK by writing CNAK */
1202                         if (ep->naking) {
1203                                 tmp = readl(&ep->regs->ctl);
1204                                 tmp |= AMD_BIT(UDC_EPCTL_CNAK);
1205                                 writel(tmp, &ep->regs->ctl);
1206                                 ep->naking = 0;
1207                                 UDC_QUEUE_CNAK(ep, ep->num);
1208                         }
1209
1210                         if (ep->in) {
1211                                 /* enable ep irq */
1212                                 tmp = readl(&dev->regs->ep_irqmsk);
1213                                 tmp &= AMD_UNMASK_BIT(ep->num);
1214                                 writel(tmp, &dev->regs->ep_irqmsk);
1215                         }
1216                 } else if (ep->in) {
1217                                 /* enable ep irq */
1218                                 tmp = readl(&dev->regs->ep_irqmsk);
1219                                 tmp &= AMD_UNMASK_BIT(ep->num);
1220                                 writel(tmp, &dev->regs->ep_irqmsk);
1221                         }
1222
1223         } else if (ep->dma) {
1224
1225                 /*
1226                  * prep_dma not used for OUT ep's, this is not possible
1227                  * for PPB modes, because of chain creation reasons
1228                  */
1229                 if (ep->in) {
1230                         retval = prep_dma(ep, req, gfp);
1231                         if (retval != 0)
1232                                 goto finished;
1233                 }
1234         }
1235         VDBG(dev, "list_add\n");
1236         /* add request to ep queue */
1237         if (req) {
1238
1239                 list_add_tail(&req->queue, &ep->queue);
1240
1241                 /* open rxfifo if out data queued */
1242                 if (open_rxfifo) {
1243                         /* enable DMA */
1244                         req->dma_going = 1;
1245                         udc_set_rde(dev);
1246                         if (ep->num != UDC_EP0OUT_IX)
1247                                 dev->data_ep_queued = 1;
1248                 }
1249                 /* stop OUT naking */
1250                 if (!ep->in) {
1251                         if (!use_dma && udc_rxfifo_pending) {
1252                                 DBG(dev, "udc_queue(): pending bytes in "
1253                                         "rxfifo after nyet\n");
1254                                 /*
1255                                  * read pending bytes afer nyet:
1256                                  * referring to isr
1257                                  */
1258                                 if (udc_rxfifo_read(ep, req)) {
1259                                         /* finish */
1260                                         complete_req(ep, req, 0);
1261                                 }
1262                                 udc_rxfifo_pending = 0;
1263
1264                         }
1265                 }
1266         }
1267
1268 finished:
1269         spin_unlock_irqrestore(&dev->lock, iflags);
1270         return retval;
1271 }
1272
1273 /* Empty request queue of an endpoint; caller holds spinlock */
1274 static void empty_req_queue(struct udc_ep *ep)
1275 {
1276         struct udc_request      *req;
1277
1278         ep->halted = 1;
1279         while (!list_empty(&ep->queue)) {
1280                 req = list_entry(ep->queue.next,
1281                         struct udc_request,
1282                         queue);
1283                 complete_req(ep, req, -ESHUTDOWN);
1284         }
1285 }
1286
1287 /* Dequeues a request packet, called by gadget driver */
1288 static int udc_dequeue(struct usb_ep *usbep, struct usb_request *usbreq)
1289 {
1290         struct udc_ep           *ep;
1291         struct udc_request      *req;
1292         unsigned                halted;
1293         unsigned long           iflags;
1294
1295         ep = container_of(usbep, struct udc_ep, ep);
1296         if (!usbep || !usbreq || (!ep->desc && (ep->num != 0
1297                                 && ep->num != UDC_EP0OUT_IX)))
1298                 return -EINVAL;
1299
1300         req = container_of(usbreq, struct udc_request, req);
1301
1302         spin_lock_irqsave(&ep->dev->lock, iflags);
1303         halted = ep->halted;
1304         ep->halted = 1;
1305         /* request in processing or next one */
1306         if (ep->queue.next == &req->queue) {
1307                 if (ep->dma && req->dma_going) {
1308                         if (ep->in)
1309                                 ep->cancel_transfer = 1;
1310                         else {
1311                                 u32 tmp;
1312                                 u32 dma_sts;
1313                                 /* stop potential receive DMA */
1314                                 tmp = readl(&udc->regs->ctl);
1315                                 writel(tmp & AMD_UNMASK_BIT(UDC_DEVCTL_RDE),
1316                                                         &udc->regs->ctl);
1317                                 /*
1318                                  * Cancel transfer later in ISR
1319                                  * if descriptor was touched.
1320                                  */
1321                                 dma_sts = AMD_GETBITS(req->td_data->status,
1322                                                         UDC_DMA_OUT_STS_BS);
1323                                 if (dma_sts != UDC_DMA_OUT_STS_BS_HOST_READY)
1324                                         ep->cancel_transfer = 1;
1325                                 else {
1326                                         udc_init_bna_dummy(ep->req);
1327                                         writel(ep->bna_dummy_req->td_phys,
1328                                                 &ep->regs->desptr);
1329                                 }
1330                                 writel(tmp, &udc->regs->ctl);
1331                         }
1332                 }
1333         }
1334         complete_req(ep, req, -ECONNRESET);
1335         ep->halted = halted;
1336
1337         spin_unlock_irqrestore(&ep->dev->lock, iflags);
1338         return 0;
1339 }
1340
1341 /* Halt or clear halt of endpoint */
1342 static int
1343 udc_set_halt(struct usb_ep *usbep, int halt)
1344 {
1345         struct udc_ep   *ep;
1346         u32 tmp;
1347         unsigned long iflags;
1348         int retval = 0;
1349
1350         if (!usbep)
1351                 return -EINVAL;
1352
1353         pr_debug("set_halt %s: halt=%d\n", usbep->name, halt);
1354
1355         ep = container_of(usbep, struct udc_ep, ep);
1356         if (!ep->desc && (ep->num != 0 && ep->num != UDC_EP0OUT_IX))
1357                 return -EINVAL;
1358         if (!ep->dev->driver || ep->dev->gadget.speed == USB_SPEED_UNKNOWN)
1359                 return -ESHUTDOWN;
1360
1361         spin_lock_irqsave(&udc_stall_spinlock, iflags);
1362         /* halt or clear halt */
1363         if (halt) {
1364                 if (ep->num == 0)
1365                         ep->dev->stall_ep0in = 1;
1366                 else {
1367                         /*
1368                          * set STALL
1369                          * rxfifo empty not taken into acount
1370                          */
1371                         tmp = readl(&ep->regs->ctl);
1372                         tmp |= AMD_BIT(UDC_EPCTL_S);
1373                         writel(tmp, &ep->regs->ctl);
1374                         ep->halted = 1;
1375
1376                         /* setup poll timer */
1377                         if (!timer_pending(&udc_pollstall_timer)) {
1378                                 udc_pollstall_timer.expires = jiffies +
1379                                         HZ * UDC_POLLSTALL_TIMER_USECONDS
1380                                         / (1000 * 1000);
1381                                 if (!stop_pollstall_timer) {
1382                                         DBG(ep->dev, "start polltimer\n");
1383                                         add_timer(&udc_pollstall_timer);
1384                                 }
1385                         }
1386                 }
1387         } else {
1388                 /* ep is halted by set_halt() before */
1389                 if (ep->halted) {
1390                         tmp = readl(&ep->regs->ctl);
1391                         /* clear stall bit */
1392                         tmp = tmp & AMD_CLEAR_BIT(UDC_EPCTL_S);
1393                         /* clear NAK by writing CNAK */
1394                         tmp |= AMD_BIT(UDC_EPCTL_CNAK);
1395                         writel(tmp, &ep->regs->ctl);
1396                         ep->halted = 0;
1397                         UDC_QUEUE_CNAK(ep, ep->num);
1398                 }
1399         }
1400         spin_unlock_irqrestore(&udc_stall_spinlock, iflags);
1401         return retval;
1402 }
1403
1404 /* gadget interface */
1405 static const struct usb_ep_ops udc_ep_ops = {
1406         .enable         = udc_ep_enable,
1407         .disable        = udc_ep_disable,
1408
1409         .alloc_request  = udc_alloc_request,
1410         .free_request   = udc_free_request,
1411
1412         .queue          = udc_queue,
1413         .dequeue        = udc_dequeue,
1414
1415         .set_halt       = udc_set_halt,
1416         /* fifo ops not implemented */
1417 };
1418
1419 /*-------------------------------------------------------------------------*/
1420
1421 /* Get frame counter (not implemented) */
1422 static int udc_get_frame(struct usb_gadget *gadget)
1423 {
1424         return -EOPNOTSUPP;
1425 }
1426
1427 /* Remote wakeup gadget interface */
1428 static int udc_wakeup(struct usb_gadget *gadget)
1429 {
1430         struct udc              *dev;
1431
1432         if (!gadget)
1433                 return -EINVAL;
1434         dev = container_of(gadget, struct udc, gadget);
1435         udc_remote_wakeup(dev);
1436
1437         return 0;
1438 }
1439
1440 /* gadget operations */
1441 static const struct usb_gadget_ops udc_ops = {
1442         .wakeup         = udc_wakeup,
1443         .get_frame      = udc_get_frame,
1444 };
1445
1446 /* Setups endpoint parameters, adds endpoints to linked list */
1447 static void make_ep_lists(struct udc *dev)
1448 {
1449         /* make gadget ep lists */
1450         INIT_LIST_HEAD(&dev->gadget.ep_list);
1451         list_add_tail(&dev->ep[UDC_EPIN_STATUS_IX].ep.ep_list,
1452                                                 &dev->gadget.ep_list);
1453         list_add_tail(&dev->ep[UDC_EPIN_IX].ep.ep_list,
1454                                                 &dev->gadget.ep_list);
1455         list_add_tail(&dev->ep[UDC_EPOUT_IX].ep.ep_list,
1456                                                 &dev->gadget.ep_list);
1457
1458         /* fifo config */
1459         dev->ep[UDC_EPIN_STATUS_IX].fifo_depth = UDC_EPIN_SMALLINT_BUFF_SIZE;
1460         if (dev->gadget.speed == USB_SPEED_FULL)
1461                 dev->ep[UDC_EPIN_IX].fifo_depth = UDC_FS_EPIN_BUFF_SIZE;
1462         else if (dev->gadget.speed == USB_SPEED_HIGH)
1463                 dev->ep[UDC_EPIN_IX].fifo_depth = hs_tx_buf;
1464         dev->ep[UDC_EPOUT_IX].fifo_depth = UDC_RXFIFO_SIZE;
1465 }
1466
1467 /* init registers at driver load time */
1468 static int startup_registers(struct udc *dev)
1469 {
1470         u32 tmp;
1471
1472         /* init controller by soft reset */
1473         udc_soft_reset(dev);
1474
1475         /* mask not needed interrupts */
1476         udc_mask_unused_interrupts(dev);
1477
1478         /* put into initial config */
1479         udc_basic_init(dev);
1480         /* link up all endpoints */
1481         udc_setup_endpoints(dev);
1482
1483         /* program speed */
1484         tmp = readl(&dev->regs->cfg);
1485         if (use_fullspeed) {
1486                 tmp = AMD_ADDBITS(tmp, UDC_DEVCFG_SPD_FS, UDC_DEVCFG_SPD);
1487         } else {
1488                 tmp = AMD_ADDBITS(tmp, UDC_DEVCFG_SPD_HS, UDC_DEVCFG_SPD);
1489         }
1490         writel(tmp, &dev->regs->cfg);
1491
1492         return 0;
1493 }
1494
1495 /* Inits UDC context */
1496 static void udc_basic_init(struct udc *dev)
1497 {
1498         u32     tmp;
1499
1500         DBG(dev, "udc_basic_init()\n");
1501
1502         dev->gadget.speed = USB_SPEED_UNKNOWN;
1503
1504         /* stop RDE timer */
1505         if (timer_pending(&udc_timer)) {
1506                 set_rde = 0;
1507                 mod_timer(&udc_timer, jiffies - 1);
1508         }
1509         /* stop poll stall timer */
1510         if (timer_pending(&udc_pollstall_timer)) {
1511                 mod_timer(&udc_pollstall_timer, jiffies - 1);
1512         }
1513         /* disable DMA */
1514         tmp = readl(&dev->regs->ctl);
1515         tmp &= AMD_UNMASK_BIT(UDC_DEVCTL_RDE);
1516         tmp &= AMD_UNMASK_BIT(UDC_DEVCTL_TDE);
1517         writel(tmp, &dev->regs->ctl);
1518
1519         /* enable dynamic CSR programming */
1520         tmp = readl(&dev->regs->cfg);
1521         tmp |= AMD_BIT(UDC_DEVCFG_CSR_PRG);
1522         /* set self powered */
1523         tmp |= AMD_BIT(UDC_DEVCFG_SP);
1524         /* set remote wakeupable */
1525         tmp |= AMD_BIT(UDC_DEVCFG_RWKP);
1526         writel(tmp, &dev->regs->cfg);
1527
1528         make_ep_lists(dev);
1529
1530         dev->data_ep_enabled = 0;
1531         dev->data_ep_queued = 0;
1532 }
1533
1534 /* Sets initial endpoint parameters */
1535 static void udc_setup_endpoints(struct udc *dev)
1536 {
1537         struct udc_ep   *ep;
1538         u32     tmp;
1539         u32     reg;
1540
1541         DBG(dev, "udc_setup_endpoints()\n");
1542
1543         /* read enum speed */
1544         tmp = readl(&dev->regs->sts);
1545         tmp = AMD_GETBITS(tmp, UDC_DEVSTS_ENUM_SPEED);
1546         if (tmp == UDC_DEVSTS_ENUM_SPEED_HIGH) {
1547                 dev->gadget.speed = USB_SPEED_HIGH;
1548         } else if (tmp == UDC_DEVSTS_ENUM_SPEED_FULL) {
1549                 dev->gadget.speed = USB_SPEED_FULL;
1550         }
1551
1552         /* set basic ep parameters */
1553         for (tmp = 0; tmp < UDC_EP_NUM; tmp++) {
1554                 ep = &dev->ep[tmp];
1555                 ep->dev = dev;
1556                 ep->ep.name = ep_string[tmp];
1557                 ep->num = tmp;
1558                 /* txfifo size is calculated at enable time */
1559                 ep->txfifo = dev->txfifo;
1560
1561                 /* fifo size */
1562                 if (tmp < UDC_EPIN_NUM) {
1563                         ep->fifo_depth = UDC_TXFIFO_SIZE;
1564                         ep->in = 1;
1565                 } else {
1566                         ep->fifo_depth = UDC_RXFIFO_SIZE;
1567                         ep->in = 0;
1568
1569                 }
1570                 ep->regs = &dev->ep_regs[tmp];
1571                 /*
1572                  * ep will be reset only if ep was not enabled before to avoid
1573                  * disabling ep interrupts when ENUM interrupt occurs but ep is
1574                  * not enabled by gadget driver
1575                  */
1576                 if (!ep->desc) {
1577                         ep_init(dev->regs, ep);
1578                 }
1579
1580                 if (use_dma) {
1581                         /*
1582                          * ep->dma is not really used, just to indicate that
1583                          * DMA is active: remove this
1584                          * dma regs = dev control regs
1585                          */
1586                         ep->dma = &dev->regs->ctl;
1587
1588                         /* nak OUT endpoints until enable - not for ep0 */
1589                         if (tmp != UDC_EP0IN_IX && tmp != UDC_EP0OUT_IX
1590                                                 && tmp > UDC_EPIN_NUM) {
1591                                 /* set NAK */
1592                                 reg = readl(&dev->ep[tmp].regs->ctl);
1593                                 reg |= AMD_BIT(UDC_EPCTL_SNAK);
1594                                 writel(reg, &dev->ep[tmp].regs->ctl);
1595                                 dev->ep[tmp].naking = 1;
1596
1597                         }
1598                 }
1599         }
1600         /* EP0 max packet */
1601         if (dev->gadget.speed == USB_SPEED_FULL) {
1602                 dev->ep[UDC_EP0IN_IX].ep.maxpacket = UDC_FS_EP0IN_MAX_PKT_SIZE;
1603                 dev->ep[UDC_EP0OUT_IX].ep.maxpacket =
1604                                                 UDC_FS_EP0OUT_MAX_PKT_SIZE;
1605         } else if (dev->gadget.speed == USB_SPEED_HIGH) {
1606                 dev->ep[UDC_EP0IN_IX].ep.maxpacket = UDC_EP0IN_MAX_PKT_SIZE;
1607                 dev->ep[UDC_EP0OUT_IX].ep.maxpacket = UDC_EP0OUT_MAX_PKT_SIZE;
1608         }
1609
1610         /*
1611          * with suspend bug workaround, ep0 params for gadget driver
1612          * are set at gadget driver bind() call
1613          */
1614         dev->gadget.ep0 = &dev->ep[UDC_EP0IN_IX].ep;
1615         dev->ep[UDC_EP0IN_IX].halted = 0;
1616         INIT_LIST_HEAD(&dev->gadget.ep0->ep_list);
1617
1618         /* init cfg/alt/int */
1619         dev->cur_config = 0;
1620         dev->cur_intf = 0;
1621         dev->cur_alt = 0;
1622 }
1623
1624 /* Bringup after Connect event, initial bringup to be ready for ep0 events */
1625 static void usb_connect(struct udc *dev)
1626 {
1627
1628         dev_info(&dev->pdev->dev, "USB Connect\n");
1629
1630         dev->connected = 1;
1631
1632         /* put into initial config */
1633         udc_basic_init(dev);
1634
1635         /* enable device setup interrupts */
1636         udc_enable_dev_setup_interrupts(dev);
1637 }
1638
1639 /*
1640  * Calls gadget with disconnect event and resets the UDC and makes
1641  * initial bringup to be ready for ep0 events
1642  */
1643 static void usb_disconnect(struct udc *dev)
1644 {
1645
1646         dev_info(&dev->pdev->dev, "USB Disconnect\n");
1647
1648         dev->connected = 0;
1649
1650         /* mask interrupts */
1651         udc_mask_unused_interrupts(dev);
1652
1653         /* REVISIT there doesn't seem to be a point to having this
1654          * talk to a tasklet ... do it directly, we already hold
1655          * the spinlock needed to process the disconnect.
1656          */
1657
1658         tasklet_schedule(&disconnect_tasklet);
1659 }
1660
1661 /* Tasklet for disconnect to be outside of interrupt context */
1662 static void udc_tasklet_disconnect(unsigned long par)
1663 {
1664         struct udc *dev = (struct udc *)(*((struct udc **) par));
1665         u32 tmp;
1666
1667         DBG(dev, "Tasklet disconnect\n");
1668         spin_lock_irq(&dev->lock);
1669
1670         if (dev->driver) {
1671                 spin_unlock(&dev->lock);
1672                 dev->driver->disconnect(&dev->gadget);
1673                 spin_lock(&dev->lock);
1674
1675                 /* empty queues */
1676                 for (tmp = 0; tmp < UDC_EP_NUM; tmp++) {
1677                         empty_req_queue(&dev->ep[tmp]);
1678                 }
1679
1680         }
1681
1682         /* disable ep0 */
1683         ep_init(dev->regs,
1684                         &dev->ep[UDC_EP0IN_IX]);
1685
1686
1687         if (!soft_reset_occured) {
1688                 /* init controller by soft reset */
1689                 udc_soft_reset(dev);
1690                 soft_reset_occured++;
1691         }
1692
1693         /* re-enable dev interrupts */
1694         udc_enable_dev_setup_interrupts(dev);
1695         /* back to full speed ? */
1696         if (use_fullspeed) {
1697                 tmp = readl(&dev->regs->cfg);
1698                 tmp = AMD_ADDBITS(tmp, UDC_DEVCFG_SPD_FS, UDC_DEVCFG_SPD);
1699                 writel(tmp, &dev->regs->cfg);
1700         }
1701
1702         spin_unlock_irq(&dev->lock);
1703 }
1704
1705 /* Reset the UDC core */
1706 static void udc_soft_reset(struct udc *dev)
1707 {
1708         unsigned long   flags;
1709
1710         DBG(dev, "Soft reset\n");
1711         /*
1712          * reset possible waiting interrupts, because int.
1713          * status is lost after soft reset,
1714          * ep int. status reset
1715          */
1716         writel(UDC_EPINT_MSK_DISABLE_ALL, &dev->regs->ep_irqsts);
1717         /* device int. status reset */
1718         writel(UDC_DEV_MSK_DISABLE, &dev->regs->irqsts);
1719
1720         spin_lock_irqsave(&udc_irq_spinlock, flags);
1721         writel(AMD_BIT(UDC_DEVCFG_SOFTRESET), &dev->regs->cfg);
1722         readl(&dev->regs->cfg);
1723         spin_unlock_irqrestore(&udc_irq_spinlock, flags);
1724
1725 }
1726
1727 /* RDE timer callback to set RDE bit */
1728 static void udc_timer_function(unsigned long v)
1729 {
1730         u32 tmp;
1731
1732         spin_lock_irq(&udc_irq_spinlock);
1733
1734         if (set_rde > 0) {
1735                 /*
1736                  * open the fifo if fifo was filled on last timer call
1737                  * conditionally
1738                  */
1739                 if (set_rde > 1) {
1740                         /* set RDE to receive setup data */
1741                         tmp = readl(&udc->regs->ctl);
1742                         tmp |= AMD_BIT(UDC_DEVCTL_RDE);
1743                         writel(tmp, &udc->regs->ctl);
1744                         set_rde = -1;
1745                 } else if (readl(&udc->regs->sts)
1746                                 & AMD_BIT(UDC_DEVSTS_RXFIFO_EMPTY)) {
1747                         /*
1748                          * if fifo empty setup polling, do not just
1749                          * open the fifo
1750                          */
1751                         udc_timer.expires = jiffies + HZ/UDC_RDE_TIMER_DIV;
1752                         if (!stop_timer) {
1753                                 add_timer(&udc_timer);
1754                         }
1755                 } else {
1756                         /*
1757                          * fifo contains data now, setup timer for opening
1758                          * the fifo when timer expires to be able to receive
1759                          * setup packets, when data packets gets queued by
1760                          * gadget layer then timer will forced to expire with
1761                          * set_rde=0 (RDE is set in udc_queue())
1762                          */
1763                         set_rde++;
1764                         /* debug: lhadmot_timer_start = 221070 */
1765                         udc_timer.expires = jiffies + HZ*UDC_RDE_TIMER_SECONDS;
1766                         if (!stop_timer) {
1767                                 add_timer(&udc_timer);
1768                         }
1769                 }
1770
1771         } else
1772                 set_rde = -1; /* RDE was set by udc_queue() */
1773         spin_unlock_irq(&udc_irq_spinlock);
1774         if (stop_timer)
1775                 complete(&on_exit);
1776
1777 }
1778
1779 /* Handle halt state, used in stall poll timer */
1780 static void udc_handle_halt_state(struct udc_ep *ep)
1781 {
1782         u32 tmp;
1783         /* set stall as long not halted */
1784         if (ep->halted == 1) {
1785                 tmp = readl(&ep->regs->ctl);
1786                 /* STALL cleared ? */
1787                 if (!(tmp & AMD_BIT(UDC_EPCTL_S))) {
1788                         /*
1789                          * FIXME: MSC spec requires that stall remains
1790                          * even on receivng of CLEAR_FEATURE HALT. So
1791                          * we would set STALL again here to be compliant.
1792                          * But with current mass storage drivers this does
1793                          * not work (would produce endless host retries).
1794                          * So we clear halt on CLEAR_FEATURE.
1795                          *
1796                         DBG(ep->dev, "ep %d: set STALL again\n", ep->num);
1797                         tmp |= AMD_BIT(UDC_EPCTL_S);
1798                         writel(tmp, &ep->regs->ctl);*/
1799
1800                         /* clear NAK by writing CNAK */
1801                         tmp |= AMD_BIT(UDC_EPCTL_CNAK);
1802                         writel(tmp, &ep->regs->ctl);
1803                         ep->halted = 0;
1804                         UDC_QUEUE_CNAK(ep, ep->num);
1805                 }
1806         }
1807 }
1808
1809 /* Stall timer callback to poll S bit and set it again after */
1810 static void udc_pollstall_timer_function(unsigned long v)
1811 {
1812         struct udc_ep *ep;
1813         int halted = 0;
1814
1815         spin_lock_irq(&udc_stall_spinlock);
1816         /*
1817          * only one IN and OUT endpoints are handled
1818          * IN poll stall
1819          */
1820         ep = &udc->ep[UDC_EPIN_IX];
1821         udc_handle_halt_state(ep);
1822         if (ep->halted)
1823                 halted = 1;
1824         /* OUT poll stall */
1825         ep = &udc->ep[UDC_EPOUT_IX];
1826         udc_handle_halt_state(ep);
1827         if (ep->halted)
1828                 halted = 1;
1829
1830         /* setup timer again when still halted */
1831         if (!stop_pollstall_timer && halted) {
1832                 udc_pollstall_timer.expires = jiffies +
1833                                         HZ * UDC_POLLSTALL_TIMER_USECONDS
1834                                         / (1000 * 1000);
1835                 add_timer(&udc_pollstall_timer);
1836         }
1837         spin_unlock_irq(&udc_stall_spinlock);
1838
1839         if (stop_pollstall_timer)
1840                 complete(&on_pollstall_exit);
1841 }
1842
1843 /* Inits endpoint 0 so that SETUP packets are processed */
1844 static void activate_control_endpoints(struct udc *dev)
1845 {
1846         u32 tmp;
1847
1848         DBG(dev, "activate_control_endpoints\n");
1849
1850         /* flush fifo */
1851         tmp = readl(&dev->ep[UDC_EP0IN_IX].regs->ctl);
1852         tmp |= AMD_BIT(UDC_EPCTL_F);
1853         writel(tmp, &dev->ep[UDC_EP0IN_IX].regs->ctl);
1854
1855         /* set ep0 directions */
1856         dev->ep[UDC_EP0IN_IX].in = 1;
1857         dev->ep[UDC_EP0OUT_IX].in = 0;
1858
1859         /* set buffer size (tx fifo entries) of EP0_IN */
1860         tmp = readl(&dev->ep[UDC_EP0IN_IX].regs->bufin_framenum);
1861         if (dev->gadget.speed == USB_SPEED_FULL)
1862                 tmp = AMD_ADDBITS(tmp, UDC_FS_EPIN0_BUFF_SIZE,
1863                                         UDC_EPIN_BUFF_SIZE);
1864         else if (dev->gadget.speed == USB_SPEED_HIGH)
1865                 tmp = AMD_ADDBITS(tmp, UDC_EPIN0_BUFF_SIZE,
1866                                         UDC_EPIN_BUFF_SIZE);
1867         writel(tmp, &dev->ep[UDC_EP0IN_IX].regs->bufin_framenum);
1868
1869         /* set max packet size of EP0_IN */
1870         tmp = readl(&dev->ep[UDC_EP0IN_IX].regs->bufout_maxpkt);
1871         if (dev->gadget.speed == USB_SPEED_FULL)
1872                 tmp = AMD_ADDBITS(tmp, UDC_FS_EP0IN_MAX_PKT_SIZE,
1873                                         UDC_EP_MAX_PKT_SIZE);
1874         else if (dev->gadget.speed == USB_SPEED_HIGH)
1875                 tmp = AMD_ADDBITS(tmp, UDC_EP0IN_MAX_PKT_SIZE,
1876                                 UDC_EP_MAX_PKT_SIZE);
1877         writel(tmp, &dev->ep[UDC_EP0IN_IX].regs->bufout_maxpkt);
1878
1879         /* set max packet size of EP0_OUT */
1880         tmp = readl(&dev->ep[UDC_EP0OUT_IX].regs->bufout_maxpkt);
1881         if (dev->gadget.speed == USB_SPEED_FULL)
1882                 tmp = AMD_ADDBITS(tmp, UDC_FS_EP0OUT_MAX_PKT_SIZE,
1883                                         UDC_EP_MAX_PKT_SIZE);
1884         else if (dev->gadget.speed == USB_SPEED_HIGH)
1885                 tmp = AMD_ADDBITS(tmp, UDC_EP0OUT_MAX_PKT_SIZE,
1886                                         UDC_EP_MAX_PKT_SIZE);
1887         writel(tmp, &dev->ep[UDC_EP0OUT_IX].regs->bufout_maxpkt);
1888
1889         /* set max packet size of EP0 in UDC CSR */
1890         tmp = readl(&dev->csr->ne[0]);
1891         if (dev->gadget.speed == USB_SPEED_FULL)
1892                 tmp = AMD_ADDBITS(tmp, UDC_FS_EP0OUT_MAX_PKT_SIZE,
1893                                         UDC_CSR_NE_MAX_PKT);
1894         else if (dev->gadget.speed == USB_SPEED_HIGH)
1895                 tmp = AMD_ADDBITS(tmp, UDC_EP0OUT_MAX_PKT_SIZE,
1896                                         UDC_CSR_NE_MAX_PKT);
1897         writel(tmp, &dev->csr->ne[0]);
1898
1899         if (use_dma) {
1900                 dev->ep[UDC_EP0OUT_IX].td->status |=
1901                         AMD_BIT(UDC_DMA_OUT_STS_L);
1902                 /* write dma desc address */
1903                 writel(dev->ep[UDC_EP0OUT_IX].td_stp_dma,
1904                         &dev->ep[UDC_EP0OUT_IX].regs->subptr);
1905                 writel(dev->ep[UDC_EP0OUT_IX].td_phys,
1906                         &dev->ep[UDC_EP0OUT_IX].regs->desptr);
1907                 /* stop RDE timer */
1908                 if (timer_pending(&udc_timer)) {
1909                         set_rde = 0;
1910                         mod_timer(&udc_timer, jiffies - 1);
1911                 }
1912                 /* stop pollstall timer */
1913                 if (timer_pending(&udc_pollstall_timer)) {
1914                         mod_timer(&udc_pollstall_timer, jiffies - 1);
1915                 }
1916                 /* enable DMA */
1917                 tmp = readl(&dev->regs->ctl);
1918                 tmp |= AMD_BIT(UDC_DEVCTL_MODE)
1919                                 | AMD_BIT(UDC_DEVCTL_RDE)
1920                                 | AMD_BIT(UDC_DEVCTL_TDE);
1921                 if (use_dma_bufferfill_mode) {
1922                         tmp |= AMD_BIT(UDC_DEVCTL_BF);
1923                 } else if (use_dma_ppb_du) {
1924                         tmp |= AMD_BIT(UDC_DEVCTL_DU);
1925                 }
1926                 writel(tmp, &dev->regs->ctl);
1927         }
1928
1929         /* clear NAK by writing CNAK for EP0IN */
1930         tmp = readl(&dev->ep[UDC_EP0IN_IX].regs->ctl);
1931         tmp |= AMD_BIT(UDC_EPCTL_CNAK);
1932         writel(tmp, &dev->ep[UDC_EP0IN_IX].regs->ctl);
1933         dev->ep[UDC_EP0IN_IX].naking = 0;
1934         UDC_QUEUE_CNAK(&dev->ep[UDC_EP0IN_IX], UDC_EP0IN_IX);
1935
1936         /* clear NAK by writing CNAK for EP0OUT */
1937         tmp = readl(&dev->ep[UDC_EP0OUT_IX].regs->ctl);
1938         tmp |= AMD_BIT(UDC_EPCTL_CNAK);
1939         writel(tmp, &dev->ep[UDC_EP0OUT_IX].regs->ctl);
1940         dev->ep[UDC_EP0OUT_IX].naking = 0;
1941         UDC_QUEUE_CNAK(&dev->ep[UDC_EP0OUT_IX], UDC_EP0OUT_IX);
1942 }
1943
1944 /* Make endpoint 0 ready for control traffic */
1945 static int setup_ep0(struct udc *dev)
1946 {
1947         activate_control_endpoints(dev);
1948         /* enable ep0 interrupts */
1949         udc_enable_ep0_interrupts(dev);
1950         /* enable device setup interrupts */
1951         udc_enable_dev_setup_interrupts(dev);
1952
1953         return 0;
1954 }
1955
1956 /* Called by gadget driver to register itself */
1957 int usb_gadget_probe_driver(struct usb_gadget_driver *driver,
1958                 int (*bind)(struct usb_gadget *))
1959 {
1960         struct udc              *dev = udc;
1961         int                     retval;
1962         u32 tmp;
1963
1964         if (!driver || !bind || !driver->setup
1965                         || driver->speed != USB_SPEED_HIGH)
1966                 return -EINVAL;
1967         if (!dev)
1968                 return -ENODEV;
1969         if (dev->driver)
1970                 return -EBUSY;
1971
1972         driver->driver.bus = NULL;
1973         dev->driver = driver;
1974         dev->gadget.dev.driver = &driver->driver;
1975
1976         retval = bind(&dev->gadget);
1977
1978         /* Some gadget drivers use both ep0 directions.
1979          * NOTE: to gadget driver, ep0 is just one endpoint...
1980          */
1981         dev->ep[UDC_EP0OUT_IX].ep.driver_data =
1982                 dev->ep[UDC_EP0IN_IX].ep.driver_data;
1983
1984         if (retval) {
1985                 DBG(dev, "binding to %s returning %d\n",
1986                                 driver->driver.name, retval);
1987                 dev->driver = NULL;
1988                 dev->gadget.dev.driver = NULL;
1989                 return retval;
1990         }
1991
1992         /* get ready for ep0 traffic */
1993         setup_ep0(dev);
1994
1995         /* clear SD */
1996         tmp = readl(&dev->regs->ctl);
1997         tmp = tmp & AMD_CLEAR_BIT(UDC_DEVCTL_SD);
1998         writel(tmp, &dev->regs->ctl);
1999
2000         usb_connect(dev);
2001
2002         return 0;
2003 }
2004 EXPORT_SYMBOL(usb_gadget_probe_driver);
2005
2006 /* shutdown requests and disconnect from gadget */
2007 static void
2008 shutdown(struct udc *dev, struct usb_gadget_driver *driver)
2009 __releases(dev->lock)
2010 __acquires(dev->lock)
2011 {
2012         int tmp;
2013
2014         if (dev->gadget.speed != USB_SPEED_UNKNOWN) {
2015                 spin_unlock(&dev->lock);
2016                 driver->disconnect(&dev->gadget);
2017                 spin_lock(&dev->lock);
2018         }
2019
2020         /* empty queues and init hardware */
2021         udc_basic_init(dev);
2022         for (tmp = 0; tmp < UDC_EP_NUM; tmp++)
2023                 empty_req_queue(&dev->ep[tmp]);
2024
2025         udc_setup_endpoints(dev);
2026 }
2027
2028 /* Called by gadget driver to unregister itself */
2029 int usb_gadget_unregister_driver(struct usb_gadget_driver *driver)
2030 {
2031         struct udc      *dev = udc;
2032         unsigned long   flags;
2033         u32 tmp;
2034
2035         if (!dev)
2036                 return -ENODEV;
2037         if (!driver || driver != dev->driver || !driver->unbind)
2038                 return -EINVAL;
2039
2040         spin_lock_irqsave(&dev->lock, flags);
2041         udc_mask_unused_interrupts(dev);
2042         shutdown(dev, driver);
2043         spin_unlock_irqrestore(&dev->lock, flags);
2044
2045         driver->unbind(&dev->gadget);
2046         dev->gadget.dev.driver = NULL;
2047         dev->driver = NULL;
2048
2049         /* set SD */
2050         tmp = readl(&dev->regs->ctl);
2051         tmp |= AMD_BIT(UDC_DEVCTL_SD);
2052         writel(tmp, &dev->regs->ctl);
2053
2054
2055         DBG(dev, "%s: unregistered\n", driver->driver.name);
2056
2057         return 0;
2058 }
2059 EXPORT_SYMBOL(usb_gadget_unregister_driver);
2060
2061
2062 /* Clear pending NAK bits */
2063 static void udc_process_cnak_queue(struct udc *dev)
2064 {
2065         u32 tmp;
2066         u32 reg;
2067
2068         /* check epin's */
2069         DBG(dev, "CNAK pending queue processing\n");
2070         for (tmp = 0; tmp < UDC_EPIN_NUM_USED; tmp++) {
2071                 if (cnak_pending & (1 << tmp)) {
2072                         DBG(dev, "CNAK pending for ep%d\n", tmp);
2073                         /* clear NAK by writing CNAK */
2074                         reg = readl(&dev->ep[tmp].regs->ctl);
2075                         reg |= AMD_BIT(UDC_EPCTL_CNAK);
2076                         writel(reg, &dev->ep[tmp].regs->ctl);
2077                         dev->ep[tmp].naking = 0;
2078                         UDC_QUEUE_CNAK(&dev->ep[tmp], dev->ep[tmp].num);
2079                 }
2080         }
2081         /* ...  and ep0out */
2082         if (cnak_pending & (1 << UDC_EP0OUT_IX)) {
2083                 DBG(dev, "CNAK pending for ep%d\n", UDC_EP0OUT_IX);
2084                 /* clear NAK by writing CNAK */
2085                 reg = readl(&dev->ep[UDC_EP0OUT_IX].regs->ctl);
2086                 reg |= AMD_BIT(UDC_EPCTL_CNAK);
2087                 writel(reg, &dev->ep[UDC_EP0OUT_IX].regs->ctl);
2088                 dev->ep[UDC_EP0OUT_IX].naking = 0;
2089                 UDC_QUEUE_CNAK(&dev->ep[UDC_EP0OUT_IX],
2090                                 dev->ep[UDC_EP0OUT_IX].num);
2091         }
2092 }
2093
2094 /* Enabling RX DMA after setup packet */
2095 static void udc_ep0_set_rde(struct udc *dev)
2096 {
2097         if (use_dma) {
2098                 /*
2099                  * only enable RXDMA when no data endpoint enabled
2100                  * or data is queued
2101                  */
2102                 if (!dev->data_ep_enabled || dev->data_ep_queued) {
2103                         udc_set_rde(dev);
2104                 } else {
2105                         /*
2106                          * setup timer for enabling RDE (to not enable
2107                          * RXFIFO DMA for data endpoints to early)
2108                          */
2109                         if (set_rde != 0 && !timer_pending(&udc_timer)) {
2110                                 udc_timer.expires =
2111                                         jiffies + HZ/UDC_RDE_TIMER_DIV;
2112                                 set_rde = 1;
2113                                 if (!stop_timer) {
2114                                         add_timer(&udc_timer);
2115                                 }
2116                         }
2117                 }
2118         }
2119 }
2120
2121
2122 /* Interrupt handler for data OUT traffic */
2123 static irqreturn_t udc_data_out_isr(struct udc *dev, int ep_ix)
2124 {
2125         irqreturn_t             ret_val = IRQ_NONE;
2126         u32                     tmp;
2127         struct udc_ep           *ep;
2128         struct udc_request      *req;
2129         unsigned int            count;
2130         struct udc_data_dma     *td = NULL;
2131         unsigned                dma_done;
2132
2133         VDBG(dev, "ep%d irq\n", ep_ix);
2134         ep = &dev->ep[ep_ix];
2135
2136         tmp = readl(&ep->regs->sts);
2137         if (use_dma) {
2138                 /* BNA event ? */
2139                 if (tmp & AMD_BIT(UDC_EPSTS_BNA)) {
2140                         DBG(dev, "BNA ep%dout occurred - DESPTR = %x \n",
2141                                         ep->num, readl(&ep->regs->desptr));
2142                         /* clear BNA */
2143                         writel(tmp | AMD_BIT(UDC_EPSTS_BNA), &ep->regs->sts);
2144                         if (!ep->cancel_transfer)
2145                                 ep->bna_occurred = 1;
2146                         else
2147                                 ep->cancel_transfer = 0;
2148                         ret_val = IRQ_HANDLED;
2149                         goto finished;
2150                 }
2151         }
2152         /* HE event ? */
2153         if (tmp & AMD_BIT(UDC_EPSTS_HE)) {
2154                 dev_err(&dev->pdev->dev, "HE ep%dout occurred\n", ep->num);
2155
2156                 /* clear HE */
2157                 writel(tmp | AMD_BIT(UDC_EPSTS_HE), &ep->regs->sts);
2158                 ret_val = IRQ_HANDLED;
2159                 goto finished;
2160         }
2161
2162         if (!list_empty(&ep->queue)) {
2163
2164                 /* next request */
2165                 req = list_entry(ep->queue.next,
2166                         struct udc_request, queue);
2167         } else {
2168                 req = NULL;
2169                 udc_rxfifo_pending = 1;
2170         }
2171         VDBG(dev, "req = %p\n", req);
2172         /* fifo mode */
2173         if (!use_dma) {
2174
2175                 /* read fifo */
2176                 if (req && udc_rxfifo_read(ep, req)) {
2177                         ret_val = IRQ_HANDLED;
2178
2179                         /* finish */
2180                         complete_req(ep, req, 0);
2181                         /* next request */
2182                         if (!list_empty(&ep->queue) && !ep->halted) {
2183                                 req = list_entry(ep->queue.next,
2184                                         struct udc_request, queue);
2185                         } else
2186                                 req = NULL;
2187                 }
2188
2189         /* DMA */
2190         } else if (!ep->cancel_transfer && req != NULL) {
2191                 ret_val = IRQ_HANDLED;
2192
2193                 /* check for DMA done */
2194                 if (!use_dma_ppb) {
2195                         dma_done = AMD_GETBITS(req->td_data->status,
2196                                                 UDC_DMA_OUT_STS_BS);
2197                 /* packet per buffer mode - rx bytes */
2198                 } else {
2199                         /*
2200                          * if BNA occurred then recover desc. from
2201                          * BNA dummy desc.
2202                          */
2203                         if (ep->bna_occurred) {
2204                                 VDBG(dev, "Recover desc. from BNA dummy\n");
2205                                 memcpy(req->td_data, ep->bna_dummy_req->td_data,
2206                                                 sizeof(struct udc_data_dma));
2207                                 ep->bna_occurred = 0;
2208                                 udc_init_bna_dummy(ep->req);
2209                         }
2210                         td = udc_get_last_dma_desc(req);
2211                         dma_done = AMD_GETBITS(td->status, UDC_DMA_OUT_STS_BS);
2212                 }
2213                 if (dma_done == UDC_DMA_OUT_STS_BS_DMA_DONE) {
2214                         /* buffer fill mode - rx bytes */
2215                         if (!use_dma_ppb) {
2216                                 /* received number bytes */
2217                                 count = AMD_GETBITS(req->td_data->status,
2218                                                 UDC_DMA_OUT_STS_RXBYTES);
2219                                 VDBG(dev, "rx bytes=%u\n", count);
2220                         /* packet per buffer mode - rx bytes */
2221                         } else {
2222                                 VDBG(dev, "req->td_data=%p\n", req->td_data);
2223                                 VDBG(dev, "last desc = %p\n", td);
2224                                 /* received number bytes */
2225                                 if (use_dma_ppb_du) {
2226                                         /* every desc. counts bytes */
2227                                         count = udc_get_ppbdu_rxbytes(req);
2228                                 } else {
2229                                         /* last desc. counts bytes */
2230                                         count = AMD_GETBITS(td->status,
2231                                                 UDC_DMA_OUT_STS_RXBYTES);
2232                                         if (!count && req->req.length
2233                                                 == UDC_DMA_MAXPACKET) {
2234                                                 /*
2235                                                  * on 64k packets the RXBYTES
2236                                                  * field is zero
2237                                                  */
2238                                                 count = UDC_DMA_MAXPACKET;
2239                                         }
2240                                 }
2241                                 VDBG(dev, "last desc rx bytes=%u\n", count);
2242                         }
2243
2244                         tmp = req->req.length - req->req.actual;
2245                         if (count > tmp) {
2246                                 if ((tmp % ep->ep.maxpacket) != 0) {
2247                                         DBG(dev, "%s: rx %db, space=%db\n",
2248                                                 ep->ep.name, count, tmp);
2249                                         req->req.status = -EOVERFLOW;
2250                                 }
2251                                 count = tmp;
2252                         }
2253                         req->req.actual += count;
2254                         req->dma_going = 0;
2255                         /* complete request */
2256                         complete_req(ep, req, 0);
2257
2258                         /* next request */
2259                         if (!list_empty(&ep->queue) && !ep->halted) {
2260                                 req = list_entry(ep->queue.next,
2261                                         struct udc_request,
2262                                         queue);
2263                                 /*
2264                                  * DMA may be already started by udc_queue()
2265                                  * called by gadget drivers completion
2266                                  * routine. This happens when queue
2267                                  * holds one request only.
2268                                  */
2269                                 if (req->dma_going == 0) {
2270                                         /* next dma */
2271                                         if (prep_dma(ep, req, GFP_ATOMIC) != 0)
2272                                                 goto finished;
2273                                         /* write desc pointer */
2274                                         writel(req->td_phys,
2275                                                 &ep->regs->desptr);
2276                                         req->dma_going = 1;
2277                                         /* enable DMA */
2278                                         udc_set_rde(dev);
2279                                 }
2280                         } else {
2281                                 /*
2282                                  * implant BNA dummy descriptor to allow
2283                                  * RXFIFO opening by RDE
2284                                  */
2285                                 if (ep->bna_dummy_req) {
2286                                         /* write desc pointer */
2287                                         writel(ep->bna_dummy_req->td_phys,
2288                                                 &ep->regs->desptr);
2289                                         ep->bna_occurred = 0;
2290                                 }
2291
2292                                 /*
2293                                  * schedule timer for setting RDE if queue
2294                                  * remains empty to allow ep0 packets pass
2295                                  * through
2296                                  */
2297                                 if (set_rde != 0
2298                                                 && !timer_pending(&udc_timer)) {
2299                                         udc_timer.expires =
2300                                                 jiffies
2301                                                 + HZ*UDC_RDE_TIMER_SECONDS;
2302                                         set_rde = 1;
2303                                         if (!stop_timer) {
2304                                                 add_timer(&udc_timer);
2305                                         }
2306                                 }
2307                                 if (ep->num != UDC_EP0OUT_IX)
2308                                         dev->data_ep_queued = 0;
2309                         }
2310
2311                 } else {
2312                         /*
2313                         * RX DMA must be reenabled for each desc in PPBDU mode
2314                         * and must be enabled for PPBNDU mode in case of BNA
2315                         */
2316                         udc_set_rde(dev);
2317                 }
2318
2319         } else if (ep->cancel_transfer) {
2320                 ret_val = IRQ_HANDLED;
2321                 ep->cancel_transfer = 0;
2322         }
2323
2324         /* check pending CNAKS */
2325         if (cnak_pending) {
2326                 /* CNAk processing when rxfifo empty only */
2327                 if (readl(&dev->regs->sts) & AMD_BIT(UDC_DEVSTS_RXFIFO_EMPTY)) {
2328                         udc_process_cnak_queue(dev);
2329                 }
2330         }
2331
2332         /* clear OUT bits in ep status */
2333         writel(UDC_EPSTS_OUT_CLEAR, &ep->regs->sts);
2334 finished:
2335         return ret_val;
2336 }
2337
2338 /* Interrupt handler for data IN traffic */
2339 static irqreturn_t udc_data_in_isr(struct udc *dev, int ep_ix)
2340 {
2341         irqreturn_t ret_val = IRQ_NONE;
2342         u32 tmp;
2343         u32 epsts;
2344         struct udc_ep *ep;
2345         struct udc_request *req;
2346         struct udc_data_dma *td;
2347         unsigned dma_done;
2348         unsigned len;
2349
2350         ep = &dev->ep[ep_ix];
2351
2352         epsts = readl(&ep->regs->sts);
2353         if (use_dma) {
2354                 /* BNA ? */
2355                 if (epsts & AMD_BIT(UDC_EPSTS_BNA)) {
2356                         dev_err(&dev->pdev->dev,
2357                                 "BNA ep%din occurred - DESPTR = %08lx \n",
2358                                 ep->num,
2359                                 (unsigned long) readl(&ep->regs->desptr));
2360
2361                         /* clear BNA */
2362                         writel(epsts, &ep->regs->sts);
2363                         ret_val = IRQ_HANDLED;
2364                         goto finished;
2365                 }
2366         }
2367         /* HE event ? */
2368         if (epsts & AMD_BIT(UDC_EPSTS_HE)) {
2369                 dev_err(&dev->pdev->dev,
2370                         "HE ep%dn occurred - DESPTR = %08lx \n",
2371                         ep->num, (unsigned long) readl(&ep->regs->desptr));
2372
2373                 /* clear HE */
2374                 writel(epsts | AMD_BIT(UDC_EPSTS_HE), &ep->regs->sts);
2375                 ret_val = IRQ_HANDLED;
2376                 goto finished;
2377         }
2378
2379         /* DMA completion */
2380         if (epsts & AMD_BIT(UDC_EPSTS_TDC)) {
2381                 VDBG(dev, "TDC set- completion\n");
2382                 ret_val = IRQ_HANDLED;
2383                 if (!ep->cancel_transfer && !list_empty(&ep->queue)) {
2384                         req = list_entry(ep->queue.next,
2385                                         struct udc_request, queue);
2386                         /*
2387                          * length bytes transferred
2388                          * check dma done of last desc. in PPBDU mode
2389                          */
2390                         if (use_dma_ppb_du) {
2391                                 td = udc_get_last_dma_desc(req);
2392                                 if (td) {
2393                                         dma_done =
2394                                                 AMD_GETBITS(td->status,
2395                                                 UDC_DMA_IN_STS_BS);
2396                                         /* don't care DMA done */
2397                                         req->req.actual = req->req.length;
2398                                 }
2399                         } else {
2400                                 /* assume all bytes transferred */
2401                                 req->req.actual = req->req.length;
2402                         }
2403
2404                         if (req->req.actual == req->req.length) {
2405                                 /* complete req */
2406                                 complete_req(ep, req, 0);
2407                                 req->dma_going = 0;
2408                                 /* further request available ? */
2409                                 if (list_empty(&ep->queue)) {
2410                                         /* disable interrupt */
2411                                         tmp = readl(&dev->regs->ep_irqmsk);
2412                                         tmp |= AMD_BIT(ep->num);
2413                                         writel(tmp, &dev->regs->ep_irqmsk);
2414                                 }
2415                         }
2416                 }
2417                 ep->cancel_transfer = 0;
2418
2419         }
2420         /*
2421          * status reg has IN bit set and TDC not set (if TDC was handled,
2422          * IN must not be handled (UDC defect) ?
2423          */
2424         if ((epsts & AMD_BIT(UDC_EPSTS_IN))
2425                         && !(epsts & AMD_BIT(UDC_EPSTS_TDC))) {
2426                 ret_val = IRQ_HANDLED;
2427                 if (!list_empty(&ep->queue)) {
2428                         /* next request */
2429                         req = list_entry(ep->queue.next,
2430                                         struct udc_request, queue);
2431                         /* FIFO mode */
2432                         if (!use_dma) {
2433                                 /* write fifo */
2434                                 udc_txfifo_write(ep, &req->req);
2435                                 len = req->req.length - req->req.actual;
2436                                                 if (len > ep->ep.maxpacket)
2437                                                         len = ep->ep.maxpacket;
2438                                                 req->req.actual += len;
2439                                 if (req->req.actual == req->req.length
2440                                         || (len != ep->ep.maxpacket)) {
2441                                         /* complete req */
2442                                         complete_req(ep, req, 0);
2443                                 }
2444                         /* DMA */
2445                         } else if (req && !req->dma_going) {
2446                                 VDBG(dev, "IN DMA : req=%p req->td_data=%p\n",
2447                                         req, req->td_data);
2448                                 if (req->td_data) {
2449
2450                                         req->dma_going = 1;
2451
2452                                         /*
2453                                          * unset L bit of first desc.
2454                                          * for chain
2455                                          */
2456                                         if (use_dma_ppb && req->req.length >
2457                                                         ep->ep.maxpacket) {
2458                                                 req->td_data->status &=
2459                                                         AMD_CLEAR_BIT(
2460                                                         UDC_DMA_IN_STS_L);
2461                                         }
2462
2463                                         /* write desc pointer */
2464                                         writel(req->td_phys, &ep->regs->desptr);
2465
2466                                         /* set HOST READY */
2467                                         req->td_data->status =
2468                                                 AMD_ADDBITS(
2469                                                 req->td_data->status,
2470                                                 UDC_DMA_IN_STS_BS_HOST_READY,
2471                                                 UDC_DMA_IN_STS_BS);
2472
2473                                         /* set poll demand bit */
2474                                         tmp = readl(&ep->regs->ctl);
2475                                         tmp |= AMD_BIT(UDC_EPCTL_P);
2476                                         writel(tmp, &ep->regs->ctl);
2477                                 }
2478                         }
2479
2480                 } else if (!use_dma && ep->in) {
2481                         /* disable interrupt */
2482                         tmp = readl(
2483                                 &dev->regs->ep_irqmsk);
2484                         tmp |= AMD_BIT(ep->num);
2485                         writel(tmp,
2486                                 &dev->regs->ep_irqmsk);
2487                 }
2488         }
2489         /* clear status bits */
2490         writel(epsts, &ep->regs->sts);
2491
2492 finished:
2493         return ret_val;
2494
2495 }
2496
2497 /* Interrupt handler for Control OUT traffic */
2498 static irqreturn_t udc_control_out_isr(struct udc *dev)
2499 __releases(dev->lock)
2500 __acquires(dev->lock)
2501 {
2502         irqreturn_t ret_val = IRQ_NONE;
2503         u32 tmp;
2504         int setup_supported;
2505         u32 count;
2506         int set = 0;
2507         struct udc_ep   *ep;
2508         struct udc_ep   *ep_tmp;
2509
2510         ep = &dev->ep[UDC_EP0OUT_IX];
2511
2512         /* clear irq */
2513         writel(AMD_BIT(UDC_EPINT_OUT_EP0), &dev->regs->ep_irqsts);
2514
2515         tmp = readl(&dev->ep[UDC_EP0OUT_IX].regs->sts);
2516         /* check BNA and clear if set */
2517         if (tmp & AMD_BIT(UDC_EPSTS_BNA)) {
2518                 VDBG(dev, "ep0: BNA set\n");
2519                 writel(AMD_BIT(UDC_EPSTS_BNA),
2520                         &dev->ep[UDC_EP0OUT_IX].regs->sts);
2521                 ep->bna_occurred = 1;
2522                 ret_val = IRQ_HANDLED;
2523                 goto finished;
2524         }
2525
2526         /* type of data: SETUP or DATA 0 bytes */
2527         tmp = AMD_GETBITS(tmp, UDC_EPSTS_OUT);
2528         VDBG(dev, "data_typ = %x\n", tmp);
2529
2530         /* setup data */
2531         if (tmp == UDC_EPSTS_OUT_SETUP) {
2532                 ret_val = IRQ_HANDLED;
2533
2534                 ep->dev->stall_ep0in = 0;
2535                 dev->waiting_zlp_ack_ep0in = 0;
2536
2537                 /* set NAK for EP0_IN */
2538                 tmp = readl(&dev->ep[UDC_EP0IN_IX].regs->ctl);
2539                 tmp |= AMD_BIT(UDC_EPCTL_SNAK);
2540                 writel(tmp, &dev->ep[UDC_EP0IN_IX].regs->ctl);
2541                 dev->ep[UDC_EP0IN_IX].naking = 1;
2542                 /* get setup data */
2543                 if (use_dma) {
2544
2545                         /* clear OUT bits in ep status */
2546                         writel(UDC_EPSTS_OUT_CLEAR,
2547                                 &dev->ep[UDC_EP0OUT_IX].regs->sts);
2548
2549                         setup_data.data[0] =
2550                                 dev->ep[UDC_EP0OUT_IX].td_stp->data12;
2551                         setup_data.data[1] =
2552                                 dev->ep[UDC_EP0OUT_IX].td_stp->data34;
2553                         /* set HOST READY */
2554                         dev->ep[UDC_EP0OUT_IX].td_stp->status =
2555                                         UDC_DMA_STP_STS_BS_HOST_READY;
2556                 } else {
2557                         /* read fifo */
2558                         udc_rxfifo_read_dwords(dev, setup_data.data, 2);
2559                 }
2560
2561                 /* determine direction of control data */
2562                 if ((setup_data.request.bRequestType & USB_DIR_IN) != 0) {
2563                         dev->gadget.ep0 = &dev->ep[UDC_EP0IN_IX].ep;
2564                         /* enable RDE */
2565                         udc_ep0_set_rde(dev);
2566                         set = 0;
2567                 } else {
2568                         dev->gadget.ep0 = &dev->ep[UDC_EP0OUT_IX].ep;
2569                         /*
2570                          * implant BNA dummy descriptor to allow RXFIFO opening
2571                          * by RDE
2572                          */
2573                         if (ep->bna_dummy_req) {
2574                                 /* write desc pointer */
2575                                 writel(ep->bna_dummy_req->td_phys,
2576                                         &dev->ep[UDC_EP0OUT_IX].regs->desptr);
2577                                 ep->bna_occurred = 0;
2578                         }
2579
2580                         set = 1;
2581                         dev->ep[UDC_EP0OUT_IX].naking = 1;
2582                         /*
2583                          * setup timer for enabling RDE (to not enable
2584                          * RXFIFO DMA for data to early)
2585                          */
2586                         set_rde = 1;
2587                         if (!timer_pending(&udc_timer)) {
2588                                 udc_timer.expires = jiffies +
2589                                                         HZ/UDC_RDE_TIMER_DIV;
2590                                 if (!stop_timer) {
2591                                         add_timer(&udc_timer);
2592                                 }
2593                         }
2594                 }
2595
2596                 /*
2597                  * mass storage reset must be processed here because
2598                  * next packet may be a CLEAR_FEATURE HALT which would not
2599                  * clear the stall bit when no STALL handshake was received
2600                  * before (autostall can cause this)
2601                  */
2602                 if (setup_data.data[0] == UDC_MSCRES_DWORD0
2603                                 && setup_data.data[1] == UDC_MSCRES_DWORD1) {
2604                         DBG(dev, "MSC Reset\n");
2605                         /*
2606                          * clear stall bits
2607                          * only one IN and OUT endpoints are handled
2608                          */
2609                         ep_tmp = &udc->ep[UDC_EPIN_IX];
2610                         udc_set_halt(&ep_tmp->ep, 0);
2611                         ep_tmp = &udc->ep[UDC_EPOUT_IX];
2612                         udc_set_halt(&ep_tmp->ep, 0);
2613                 }
2614
2615                 /* call gadget with setup data received */
2616                 spin_unlock(&dev->lock);
2617                 setup_supported = dev->driver->setup(&dev->gadget,
2618                                                 &setup_data.request);
2619                 spin_lock(&dev->lock);
2620
2621                 tmp = readl(&dev->ep[UDC_EP0IN_IX].regs->ctl);
2622                 /* ep0 in returns data (not zlp) on IN phase */
2623                 if (setup_supported >= 0 && setup_supported <
2624                                 UDC_EP0IN_MAXPACKET) {
2625                         /* clear NAK by writing CNAK in EP0_IN */
2626                         tmp |= AMD_BIT(UDC_EPCTL_CNAK);
2627                         writel(tmp, &dev->ep[UDC_EP0IN_IX].regs->ctl);
2628                         dev->ep[UDC_EP0IN_IX].naking = 0;
2629                         UDC_QUEUE_CNAK(&dev->ep[UDC_EP0IN_IX], UDC_EP0IN_IX);
2630
2631                 /* if unsupported request then stall */
2632                 } else if (setup_supported < 0) {
2633                         tmp |= AMD_BIT(UDC_EPCTL_S);
2634                         writel(tmp, &dev->ep[UDC_EP0IN_IX].regs->ctl);
2635                 } else
2636                         dev->waiting_zlp_ack_ep0in = 1;
2637
2638
2639                 /* clear NAK by writing CNAK in EP0_OUT */
2640                 if (!set) {
2641                         tmp = readl(&dev->ep[UDC_EP0OUT_IX].regs->ctl);
2642                         tmp |= AMD_BIT(UDC_EPCTL_CNAK);
2643                         writel(tmp, &dev->ep[UDC_EP0OUT_IX].regs->ctl);
2644                         dev->ep[UDC_EP0OUT_IX].naking = 0;
2645                         UDC_QUEUE_CNAK(&dev->ep[UDC_EP0OUT_IX], UDC_EP0OUT_IX);
2646                 }
2647
2648                 if (!use_dma) {
2649                         /* clear OUT bits in ep status */
2650                         writel(UDC_EPSTS_OUT_CLEAR,
2651                                 &dev->ep[UDC_EP0OUT_IX].regs->sts);
2652                 }
2653
2654         /* data packet 0 bytes */
2655         } else if (tmp == UDC_EPSTS_OUT_DATA) {
2656                 /* clear OUT bits in ep status */
2657                 writel(UDC_EPSTS_OUT_CLEAR, &dev->ep[UDC_EP0OUT_IX].regs->sts);
2658
2659                 /* get setup data: only 0 packet */
2660                 if (use_dma) {
2661                         /* no req if 0 packet, just reactivate */
2662                         if (list_empty(&dev->ep[UDC_EP0OUT_IX].queue)) {
2663                                 VDBG(dev, "ZLP\n");
2664
2665                                 /* set HOST READY */
2666                                 dev->ep[UDC_EP0OUT_IX].td->status =
2667                                         AMD_ADDBITS(
2668                                         dev->ep[UDC_EP0OUT_IX].td->status,
2669                                         UDC_DMA_OUT_STS_BS_HOST_READY,
2670                                         UDC_DMA_OUT_STS_BS);
2671                                 /* enable RDE */
2672                                 udc_ep0_set_rde(dev);
2673                                 ret_val = IRQ_HANDLED;
2674
2675                         } else {
2676                                 /* control write */
2677                                 ret_val |= udc_data_out_isr(dev, UDC_EP0OUT_IX);
2678                                 /* re-program desc. pointer for possible ZLPs */
2679                                 writel(dev->ep[UDC_EP0OUT_IX].td_phys,
2680                                         &dev->ep[UDC_EP0OUT_IX].regs->desptr);
2681                                 /* enable RDE */
2682                                 udc_ep0_set_rde(dev);
2683                         }
2684                 } else {
2685
2686                         /* received number bytes */
2687                         count = readl(&dev->ep[UDC_EP0OUT_IX].regs->sts);
2688                         count = AMD_GETBITS(count, UDC_EPSTS_RX_PKT_SIZE);
2689                         /* out data for fifo mode not working */
2690                         count = 0;
2691
2692                         /* 0 packet or real data ? */
2693                         if (count != 0) {
2694                                 ret_val |= udc_data_out_isr(dev, UDC_EP0OUT_IX);
2695                         } else {
2696                                 /* dummy read confirm */
2697                                 readl(&dev->ep[UDC_EP0OUT_IX].regs->confirm);
2698                                 ret_val = IRQ_HANDLED;
2699                         }
2700                 }
2701         }
2702
2703         /* check pending CNAKS */
2704         if (cnak_pending) {
2705                 /* CNAk processing when rxfifo empty only */
2706                 if (readl(&dev->regs->sts) & AMD_BIT(UDC_DEVSTS_RXFIFO_EMPTY)) {
2707                         udc_process_cnak_queue(dev);
2708                 }
2709         }
2710
2711 finished:
2712         return ret_val;
2713 }
2714
2715 /* Interrupt handler for Control IN traffic */
2716 static irqreturn_t udc_control_in_isr(struct udc *dev)
2717 {
2718         irqreturn_t ret_val = IRQ_NONE;
2719         u32 tmp;
2720         struct udc_ep *ep;
2721         struct udc_request *req;
2722         unsigned len;
2723
2724         ep = &dev->ep[UDC_EP0IN_IX];
2725
2726         /* clear irq */
2727         writel(AMD_BIT(UDC_EPINT_IN_EP0), &dev->regs->ep_irqsts);
2728
2729         tmp = readl(&dev->ep[UDC_EP0IN_IX].regs->sts);
2730         /* DMA completion */
2731         if (tmp & AMD_BIT(UDC_EPSTS_TDC)) {
2732                 VDBG(dev, "isr: TDC clear \n");
2733                 ret_val = IRQ_HANDLED;
2734
2735                 /* clear TDC bit */
2736                 writel(AMD_BIT(UDC_EPSTS_TDC),
2737                                 &dev->ep[UDC_EP0IN_IX].regs->sts);
2738
2739         /* status reg has IN bit set ? */
2740         } else if (tmp & AMD_BIT(UDC_EPSTS_IN)) {
2741                 ret_val = IRQ_HANDLED;
2742
2743                 if (ep->dma) {
2744                         /* clear IN bit */
2745                         writel(AMD_BIT(UDC_EPSTS_IN),
2746                                 &dev->ep[UDC_EP0IN_IX].regs->sts);
2747                 }
2748                 if (dev->stall_ep0in) {
2749                         DBG(dev, "stall ep0in\n");
2750                         /* halt ep0in */
2751                         tmp = readl(&ep->regs->ctl);
2752                         tmp |= AMD_BIT(UDC_EPCTL_S);
2753                         writel(tmp, &ep->regs->ctl);
2754                 } else {
2755                         if (!list_empty(&ep->queue)) {
2756                                 /* next request */
2757                                 req = list_entry(ep->queue.next,
2758                                                 struct udc_request, queue);
2759
2760                                 if (ep->dma) {
2761                                         /* write desc pointer */
2762                                         writel(req->td_phys, &ep->regs->desptr);
2763                                         /* set HOST READY */
2764                                         req->td_data->status =
2765                                                 AMD_ADDBITS(
2766                                                 req->td_data->status,
2767                                                 UDC_DMA_STP_STS_BS_HOST_READY,
2768                                                 UDC_DMA_STP_STS_BS);
2769
2770                                         /* set poll demand bit */
2771                                         tmp =
2772                                         readl(&dev->ep[UDC_EP0IN_IX].regs->ctl);
2773                                         tmp |= AMD_BIT(UDC_EPCTL_P);
2774                                         writel(tmp,
2775                                         &dev->ep[UDC_EP0IN_IX].regs->ctl);
2776
2777                                         /* all bytes will be transferred */
2778                                         req->req.actual = req->req.length;
2779
2780                                         /* complete req */
2781                                         complete_req(ep, req, 0);
2782
2783                                 } else {
2784                                         /* write fifo */
2785                                         udc_txfifo_write(ep, &req->req);
2786
2787                                         /* lengh bytes transferred */
2788                                         len = req->req.length - req->req.actual;
2789                                         if (len > ep->ep.maxpacket)
2790                                                 len = ep->ep.maxpacket;
2791
2792                                         req->req.actual += len;
2793                                         if (req->req.actual == req->req.length
2794                                                 || (len != ep->ep.maxpacket)) {
2795                                                 /* complete req */
2796                                                 complete_req(ep, req, 0);
2797                                         }
2798                                 }
2799
2800                         }
2801                 }
2802                 ep->halted = 0;
2803                 dev->stall_ep0in = 0;
2804                 if (!ep->dma) {
2805                         /* clear IN bit */
2806                         writel(AMD_BIT(UDC_EPSTS_IN),
2807                                 &dev->ep[UDC_EP0IN_IX].regs->sts);
2808                 }
2809         }
2810
2811         return ret_val;
2812 }
2813
2814
2815 /* Interrupt handler for global device events */
2816 static irqreturn_t udc_dev_isr(struct udc *dev, u32 dev_irq)
2817 __releases(dev->lock)
2818 __acquires(dev->lock)
2819 {
2820         irqreturn_t ret_val = IRQ_NONE;
2821         u32 tmp;
2822         u32 cfg;
2823         struct udc_ep *ep;
2824         u16 i;
2825         u8 udc_csr_epix;
2826
2827         /* SET_CONFIG irq ? */
2828         if (dev_irq & AMD_BIT(UDC_DEVINT_SC)) {
2829                 ret_val = IRQ_HANDLED;
2830
2831                 /* read config value */
2832                 tmp = readl(&dev->regs->sts);
2833                 cfg = AMD_GETBITS(tmp, UDC_DEVSTS_CFG);
2834                 DBG(dev, "SET_CONFIG interrupt: config=%d\n", cfg);
2835                 dev->cur_config = cfg;
2836                 dev->set_cfg_not_acked = 1;
2837
2838                 /* make usb request for gadget driver */
2839                 memset(&setup_data, 0 , sizeof(union udc_setup_data));
2840                 setup_data.request.bRequest = USB_REQ_SET_CONFIGURATION;
2841                 setup_data.request.wValue = cpu_to_le16(dev->cur_config);
2842
2843                 /* programm the NE registers */
2844                 for (i = 0; i < UDC_EP_NUM; i++) {
2845                         ep = &dev->ep[i];
2846                         if (ep->in) {
2847
2848                                 /* ep ix in UDC CSR register space */
2849                                 udc_csr_epix = ep->num;
2850
2851
2852                         /* OUT ep */
2853                         } else {
2854                                 /* ep ix in UDC CSR register space */
2855                                 udc_csr_epix = ep->num - UDC_CSR_EP_OUT_IX_OFS;
2856                         }
2857
2858                         tmp = readl(&dev->csr->ne[udc_csr_epix]);
2859                         /* ep cfg */
2860                         tmp = AMD_ADDBITS(tmp, ep->dev->cur_config,
2861                                                 UDC_CSR_NE_CFG);
2862                         /* write reg */
2863                         writel(tmp, &dev->csr->ne[udc_csr_epix]);
2864
2865                         /* clear stall bits */
2866                         ep->halted = 0;
2867                         tmp = readl(&ep->regs->ctl);
2868                         tmp = tmp & AMD_CLEAR_BIT(UDC_EPCTL_S);
2869                         writel(tmp, &ep->regs->ctl);
2870                 }
2871                 /* call gadget zero with setup data received */
2872                 spin_unlock(&dev->lock);
2873                 tmp = dev->driver->setup(&dev->gadget, &setup_data.request);
2874                 spin_lock(&dev->lock);
2875
2876         } /* SET_INTERFACE ? */
2877         if (dev_irq & AMD_BIT(UDC_DEVINT_SI)) {
2878                 ret_val = IRQ_HANDLED;
2879
2880                 dev->set_cfg_not_acked = 1;
2881                 /* read interface and alt setting values */
2882                 tmp = readl(&dev->regs->sts);
2883                 dev->cur_alt = AMD_GETBITS(tmp, UDC_DEVSTS_ALT);
2884                 dev->cur_intf = AMD_GETBITS(tmp, UDC_DEVSTS_INTF);
2885
2886                 /* make usb request for gadget driver */
2887                 memset(&setup_data, 0 , sizeof(union udc_setup_data));
2888                 setup_data.request.bRequest = USB_REQ_SET_INTERFACE;
2889                 setup_data.request.bRequestType = USB_RECIP_INTERFACE;
2890                 setup_data.request.wValue = cpu_to_le16(dev->cur_alt);
2891                 setup_data.request.wIndex = cpu_to_le16(dev->cur_intf);
2892
2893                 DBG(dev, "SET_INTERFACE interrupt: alt=%d intf=%d\n",
2894                                 dev->cur_alt, dev->cur_intf);
2895
2896                 /* programm the NE registers */
2897                 for (i = 0; i < UDC_EP_NUM; i++) {
2898                         ep = &dev->ep[i];
2899                         if (ep->in) {
2900
2901                                 /* ep ix in UDC CSR register space */
2902                                 udc_csr_epix = ep->num;
2903
2904
2905                         /* OUT ep */
2906                         } else {
2907                                 /* ep ix in UDC CSR register space */
2908                                 udc_csr_epix = ep->num - UDC_CSR_EP_OUT_IX_OFS;
2909                         }
2910
2911                         /* UDC CSR reg */
2912                         /* set ep values */
2913                         tmp = readl(&dev->csr->ne[udc_csr_epix]);
2914                         /* ep interface */
2915                         tmp = AMD_ADDBITS(tmp, ep->dev->cur_intf,
2916                                                 UDC_CSR_NE_INTF);
2917                         /* tmp = AMD_ADDBITS(tmp, 2, UDC_CSR_NE_INTF); */
2918                         /* ep alt */
2919                         tmp = AMD_ADDBITS(tmp, ep->dev->cur_alt,
2920                                                 UDC_CSR_NE_ALT);
2921                         /* write reg */
2922                         writel(tmp, &dev->csr->ne[udc_csr_epix]);
2923
2924                         /* clear stall bits */
2925                         ep->halted = 0;
2926                         tmp = readl(&ep->regs->ctl);
2927                         tmp = tmp & AMD_CLEAR_BIT(UDC_EPCTL_S);
2928                         writel(tmp, &ep->regs->ctl);
2929                 }
2930
2931                 /* call gadget zero with setup data received */
2932                 spin_unlock(&dev->lock);
2933                 tmp = dev->driver->setup(&dev->gadget, &setup_data.request);
2934                 spin_lock(&dev->lock);
2935
2936         } /* USB reset */
2937         if (dev_irq & AMD_BIT(UDC_DEVINT_UR)) {
2938                 DBG(dev, "USB Reset interrupt\n");
2939                 ret_val = IRQ_HANDLED;
2940
2941                 /* allow soft reset when suspend occurs */
2942                 soft_reset_occured = 0;
2943
2944                 dev->waiting_zlp_ack_ep0in = 0;
2945                 dev->set_cfg_not_acked = 0;
2946
2947                 /* mask not needed interrupts */
2948                 udc_mask_unused_interrupts(dev);
2949
2950                 /* call gadget to resume and reset configs etc. */
2951                 spin_unlock(&dev->lock);
2952                 if (dev->sys_suspended && dev->driver->resume) {
2953                         dev->driver->resume(&dev->gadget);
2954                         dev->sys_suspended = 0;
2955                 }
2956                 dev->driver->disconnect(&dev->gadget);
2957                 spin_lock(&dev->lock);
2958
2959                 /* disable ep0 to empty req queue */
2960                 empty_req_queue(&dev->ep[UDC_EP0IN_IX]);
2961                 ep_init(dev->regs, &dev->ep[UDC_EP0IN_IX]);
2962
2963                 /* soft reset when rxfifo not empty */
2964                 tmp = readl(&dev->regs->sts);
2965                 if (!(tmp & AMD_BIT(UDC_DEVSTS_RXFIFO_EMPTY))
2966                                 && !soft_reset_after_usbreset_occured) {
2967                         udc_soft_reset(dev);
2968                         soft_reset_after_usbreset_occured++;
2969                 }
2970
2971                 /*
2972                  * DMA reset to kill potential old DMA hw hang,
2973                  * POLL bit is already reset by ep_init() through
2974                  * disconnect()
2975                  */
2976                 DBG(dev, "DMA machine reset\n");
2977                 tmp = readl(&dev->regs->cfg);
2978                 writel(tmp | AMD_BIT(UDC_DEVCFG_DMARST), &dev->regs->cfg);
2979                 writel(tmp, &dev->regs->cfg);
2980
2981                 /* put into initial config */
2982                 udc_basic_init(dev);
2983
2984                 /* enable device setup interrupts */
2985                 udc_enable_dev_setup_interrupts(dev);
2986
2987                 /* enable suspend interrupt */
2988                 tmp = readl(&dev->regs->irqmsk);
2989                 tmp &= AMD_UNMASK_BIT(UDC_DEVINT_US);
2990                 writel(tmp, &dev->regs->irqmsk);
2991
2992         } /* USB suspend */
2993         if (dev_irq & AMD_BIT(UDC_DEVINT_US)) {
2994                 DBG(dev, "USB Suspend interrupt\n");
2995                 ret_val = IRQ_HANDLED;
2996                 if (dev->driver->suspend) {
2997                         spin_unlock(&dev->lock);
2998                         dev->sys_suspended = 1;
2999                         dev->driver->suspend(&dev->gadget);
3000                         spin_lock(&dev->lock);
3001                 }
3002         } /* new speed ? */
3003         if (dev_irq & AMD_BIT(UDC_DEVINT_ENUM)) {
3004                 DBG(dev, "ENUM interrupt\n");
3005                 ret_val = IRQ_HANDLED;
3006                 soft_reset_after_usbreset_occured = 0;
3007
3008                 /* disable ep0 to empty req queue */
3009                 empty_req_queue(&dev->ep[UDC_EP0IN_IX]);
3010                 ep_init(dev->regs, &dev->ep[UDC_EP0IN_IX]);
3011
3012                 /* link up all endpoints */
3013                 udc_setup_endpoints(dev);
3014                 if (dev->gadget.speed == USB_SPEED_HIGH) {
3015                         dev_info(&dev->pdev->dev, "Connect: speed = %s\n",
3016                                 "high");
3017                 } else if (dev->gadget.speed == USB_SPEED_FULL) {
3018                         dev_info(&dev->pdev->dev, "Connect: speed = %s\n",
3019                                 "full");
3020                 }
3021
3022                 /* init ep 0 */
3023                 activate_control_endpoints(dev);
3024
3025                 /* enable ep0 interrupts */
3026                 udc_enable_ep0_interrupts(dev);
3027         }
3028         /* session valid change interrupt */
3029         if (dev_irq & AMD_BIT(UDC_DEVINT_SVC)) {
3030                 DBG(dev, "USB SVC interrupt\n");
3031                 ret_val = IRQ_HANDLED;
3032
3033                 /* check that session is not valid to detect disconnect */
3034                 tmp = readl(&dev->regs->sts);
3035                 if (!(tmp & AMD_BIT(UDC_DEVSTS_SESSVLD))) {
3036                         /* disable suspend interrupt */
3037                         tmp = readl(&dev->regs->irqmsk);
3038                         tmp |= AMD_BIT(UDC_DEVINT_US);
3039                         writel(tmp, &dev->regs->irqmsk);
3040                         DBG(dev, "USB Disconnect (session valid low)\n");
3041                         /* cleanup on disconnect */
3042                         usb_disconnect(udc);
3043                 }
3044
3045         }
3046
3047         return ret_val;
3048 }
3049
3050 /* Interrupt Service Routine, see Linux Kernel Doc for parameters */
3051 static irqreturn_t udc_irq(int irq, void *pdev)
3052 {
3053         struct udc *dev = pdev;
3054         u32 reg;
3055         u16 i;
3056         u32 ep_irq;
3057         irqreturn_t ret_val = IRQ_NONE;
3058
3059         spin_lock(&dev->lock);
3060
3061         /* check for ep irq */
3062         reg = readl(&dev->regs->ep_irqsts);
3063         if (reg) {
3064                 if (reg & AMD_BIT(UDC_EPINT_OUT_EP0))
3065                         ret_val |= udc_control_out_isr(dev);
3066                 if (reg & AMD_BIT(UDC_EPINT_IN_EP0))
3067                         ret_val |= udc_control_in_isr(dev);
3068
3069                 /*
3070                  * data endpoint
3071                  * iterate ep's
3072                  */
3073                 for (i = 1; i < UDC_EP_NUM; i++) {
3074                         ep_irq = 1 << i;
3075                         if (!(reg & ep_irq) || i == UDC_EPINT_OUT_EP0)
3076                                 continue;
3077
3078                         /* clear irq status */
3079                         writel(ep_irq, &dev->regs->ep_irqsts);
3080
3081                         /* irq for out ep ? */
3082                         if (i > UDC_EPIN_NUM)
3083                                 ret_val |= udc_data_out_isr(dev, i);
3084                         else
3085                                 ret_val |= udc_data_in_isr(dev, i);
3086                 }
3087
3088         }
3089
3090
3091         /* check for dev irq */
3092         reg = readl(&dev->regs->irqsts);
3093         if (reg) {
3094                 /* clear irq */
3095                 writel(reg, &dev->regs->irqsts);
3096                 ret_val |= udc_dev_isr(dev, reg);
3097         }
3098
3099
3100         spin_unlock(&dev->lock);
3101         return ret_val;
3102 }
3103
3104 /* Tears down device */
3105 static void gadget_release(struct device *pdev)
3106 {
3107         struct amd5536udc *dev = dev_get_drvdata(pdev);
3108         kfree(dev);
3109 }
3110
3111 /* Cleanup on device remove */
3112 static void udc_remove(struct udc *dev)
3113 {
3114         /* remove timer */
3115         stop_timer++;
3116         if (timer_pending(&udc_timer))
3117                 wait_for_completion(&on_exit);
3118         if (udc_timer.data)
3119                 del_timer_sync(&udc_timer);
3120         /* remove pollstall timer */
3121         stop_pollstall_timer++;
3122         if (timer_pending(&udc_pollstall_timer))
3123                 wait_for_completion(&on_pollstall_exit);
3124         if (udc_pollstall_timer.data)
3125                 del_timer_sync(&udc_pollstall_timer);
3126         udc = NULL;
3127 }
3128
3129 /* Reset all pci context */
3130 static void udc_pci_remove(struct pci_dev *pdev)
3131 {
3132         struct udc              *dev;
3133
3134         dev = pci_get_drvdata(pdev);
3135
3136         /* gadget driver must not be registered */
3137         BUG_ON(dev->driver != NULL);
3138
3139         /* dma pool cleanup */
3140         if (dev->data_requests)
3141                 pci_pool_destroy(dev->data_requests);
3142
3143         if (dev->stp_requests) {
3144                 /* cleanup DMA desc's for ep0in */
3145                 pci_pool_free(dev->stp_requests,
3146                         dev->ep[UDC_EP0OUT_IX].td_stp,
3147                         dev->ep[UDC_EP0OUT_IX].td_stp_dma);
3148                 pci_pool_free(dev->stp_requests,
3149                         dev->ep[UDC_EP0OUT_IX].td,
3150                         dev->ep[UDC_EP0OUT_IX].td_phys);
3151
3152                 pci_pool_destroy(dev->stp_requests);
3153         }
3154
3155         /* reset controller */
3156         writel(AMD_BIT(UDC_DEVCFG_SOFTRESET), &dev->regs->cfg);
3157         if (dev->irq_registered)
3158                 free_irq(pdev->irq, dev);
3159         if (dev->regs)
3160                 iounmap(dev->regs);
3161         if (dev->mem_region)
3162                 release_mem_region(pci_resource_start(pdev, 0),
3163                                 pci_resource_len(pdev, 0));
3164         if (dev->active)
3165                 pci_disable_device(pdev);
3166
3167         device_unregister(&dev->gadget.dev);
3168         pci_set_drvdata(pdev, NULL);
3169
3170         udc_remove(dev);
3171 }
3172
3173 /* create dma pools on init */
3174 static int init_dma_pools(struct udc *dev)
3175 {
3176         struct udc_stp_dma      *td_stp;
3177         struct udc_data_dma     *td_data;
3178         int retval;
3179
3180         /* consistent DMA mode setting ? */
3181         if (use_dma_ppb) {
3182                 use_dma_bufferfill_mode = 0;
3183         } else {
3184                 use_dma_ppb_du = 0;
3185                 use_dma_bufferfill_mode = 1;
3186         }
3187
3188         /* DMA setup */
3189         dev->data_requests = dma_pool_create("data_requests", NULL,
3190                 sizeof(struct udc_data_dma), 0, 0);
3191         if (!dev->data_requests) {
3192                 DBG(dev, "can't get request data pool\n");
3193                 retval = -ENOMEM;
3194                 goto finished;
3195         }
3196
3197         /* EP0 in dma regs = dev control regs */
3198         dev->ep[UDC_EP0IN_IX].dma = &dev->regs->ctl;
3199
3200         /* dma desc for setup data */
3201         dev->stp_requests = dma_pool_create("setup requests", NULL,
3202                 sizeof(struct udc_stp_dma), 0, 0);
3203         if (!dev->stp_requests) {
3204                 DBG(dev, "can't get stp request pool\n");
3205                 retval = -ENOMEM;
3206                 goto finished;
3207         }
3208         /* setup */
3209         td_stp = dma_pool_alloc(dev->stp_requests, GFP_KERNEL,
3210                                 &dev->ep[UDC_EP0OUT_IX].td_stp_dma);
3211         if (td_stp == NULL) {
3212                 retval = -ENOMEM;
3213                 goto finished;
3214         }
3215         dev->ep[UDC_EP0OUT_IX].td_stp = td_stp;
3216
3217         /* data: 0 packets !? */
3218         td_data = dma_pool_alloc(dev->stp_requests, GFP_KERNEL,
3219                                 &dev->ep[UDC_EP0OUT_IX].td_phys);
3220         if (td_data == NULL) {
3221                 retval = -ENOMEM;
3222                 goto finished;
3223         }
3224         dev->ep[UDC_EP0OUT_IX].td = td_data;
3225         return 0;
3226
3227 finished:
3228         return retval;
3229 }
3230
3231 /* Called by pci bus driver to init pci context */
3232 static int udc_pci_probe(
3233         struct pci_dev *pdev,
3234         const struct pci_device_id *id
3235 )
3236 {
3237         struct udc              *dev;
3238         unsigned long           resource;
3239         unsigned long           len;
3240         int                     retval = 0;
3241
3242         /* one udc only */
3243         if (udc) {
3244                 dev_dbg(&pdev->dev, "already probed\n");
3245                 return -EBUSY;
3246         }
3247
3248         /* init */
3249         dev = kzalloc(sizeof(struct udc), GFP_KERNEL);
3250         if (!dev) {
3251                 retval = -ENOMEM;
3252                 goto finished;
3253         }
3254
3255         /* pci setup */
3256         if (pci_enable_device(pdev) < 0) {
3257                 kfree(dev);
3258                 dev = NULL;
3259                 retval = -ENODEV;
3260                 goto finished;
3261         }
3262         dev->active = 1;
3263
3264         /* PCI resource allocation */
3265         resource = pci_resource_start(pdev, 0);
3266         len = pci_resource_len(pdev, 0);
3267
3268         if (!request_mem_region(resource, len, name)) {
3269                 dev_dbg(&pdev->dev, "pci device used already\n");
3270                 kfree(dev);
3271                 dev = NULL;
3272                 retval = -EBUSY;
3273                 goto finished;
3274         }
3275         dev->mem_region = 1;
3276
3277         dev->virt_addr = ioremap_nocache(resource, len);
3278         if (dev->virt_addr == NULL) {
3279                 dev_dbg(&pdev->dev, "start address cannot be mapped\n");
3280                 kfree(dev);
3281                 dev = NULL;
3282                 retval = -EFAULT;
3283                 goto finished;
3284         }
3285
3286         if (!pdev->irq) {
3287                 dev_err(&dev->pdev->dev, "irq not set\n");
3288                 kfree(dev);
3289                 dev = NULL;
3290                 retval = -ENODEV;
3291                 goto finished;
3292         }
3293
3294         spin_lock_init(&dev->lock);
3295         /* udc csr registers base */
3296         dev->csr = dev->virt_addr + UDC_CSR_ADDR;
3297         /* dev registers base */
3298         dev->regs = dev->virt_addr + UDC_DEVCFG_ADDR;
3299         /* ep registers base */
3300         dev->ep_regs = dev->virt_addr + UDC_EPREGS_ADDR;
3301         /* fifo's base */
3302         dev->rxfifo = (u32 __iomem *)(dev->virt_addr + UDC_RXFIFO_ADDR);
3303         dev->txfifo = (u32 __iomem *)(dev->virt_addr + UDC_TXFIFO_ADDR);
3304
3305         if (request_irq(pdev->irq, udc_irq, IRQF_SHARED, name, dev) != 0) {
3306                 dev_dbg(&dev->pdev->dev, "request_irq(%d) fail\n", pdev->irq);
3307                 kfree(dev);
3308                 dev = NULL;
3309                 retval = -EBUSY;
3310                 goto finished;
3311         }
3312         dev->irq_registered = 1;
3313
3314         pci_set_drvdata(pdev, dev);
3315
3316         /* chip revision for Hs AMD5536 */
3317         dev->chiprev = pdev->revision;
3318
3319         pci_set_master(pdev);
3320         pci_try_set_mwi(pdev);
3321
3322         /* init dma pools */
3323         if (use_dma) {
3324                 retval = init_dma_pools(dev);
3325                 if (retval != 0)
3326                         goto finished;
3327         }
3328
3329         dev->phys_addr = resource;
3330         dev->irq = pdev->irq;
3331         dev->pdev = pdev;
3332         dev->gadget.dev.parent = &pdev->dev;
3333         dev->gadget.dev.dma_mask = pdev->dev.dma_mask;
3334
3335         /* general probing */
3336         if (udc_probe(dev) == 0)
3337                 return 0;
3338
3339 finished:
3340         if (dev)
3341                 udc_pci_remove(pdev);
3342         return retval;
3343 }
3344
3345 /* general probe */
3346 static int udc_probe(struct udc *dev)
3347 {
3348         char            tmp[128];
3349         u32             reg;
3350         int             retval;
3351
3352         /* mark timer as not initialized */
3353         udc_timer.data = 0;
3354         udc_pollstall_timer.data = 0;
3355
3356         /* device struct setup */
3357         dev->gadget.ops = &udc_ops;
3358
3359         dev_set_name(&dev->gadget.dev, "gadget");
3360         dev->gadget.dev.release = gadget_release;
3361         dev->gadget.name = name;
3362         dev->gadget.is_dualspeed = 1;
3363
3364         /* init registers, interrupts, ... */
3365         startup_registers(dev);
3366
3367         dev_info(&dev->pdev->dev, "%s\n", mod_desc);
3368
3369         snprintf(tmp, sizeof tmp, "%d", dev->irq);
3370         dev_info(&dev->pdev->dev,
3371                 "irq %s, pci mem %08lx, chip rev %02x(Geode5536 %s)\n",
3372                 tmp, dev->phys_addr, dev->chiprev,
3373                 (dev->chiprev == UDC_HSA0_REV) ? "A0" : "B1");
3374         strcpy(tmp, UDC_DRIVER_VERSION_STRING);
3375         if (dev->chiprev == UDC_HSA0_REV) {
3376                 dev_err(&dev->pdev->dev, "chip revision is A0; too old\n");
3377                 retval = -ENODEV;
3378                 goto finished;
3379         }
3380         dev_info(&dev->pdev->dev,
3381                 "driver version: %s(for Geode5536 B1)\n", tmp);
3382         udc = dev;
3383
3384         retval = device_register(&dev->gadget.dev);
3385         if (retval) {
3386                 put_device(&dev->gadget.dev);
3387                 goto finished;
3388         }
3389
3390         /* timer init */
3391         init_timer(&udc_timer);
3392         udc_timer.function = udc_timer_function;
3393         udc_timer.data = 1;
3394         /* timer pollstall init */
3395         init_timer(&udc_pollstall_timer);
3396         udc_pollstall_timer.function = udc_pollstall_timer_function;
3397         udc_pollstall_timer.data = 1;
3398
3399         /* set SD */
3400         reg = readl(&dev->regs->ctl);
3401         reg |= AMD_BIT(UDC_DEVCTL_SD);
3402         writel(reg, &dev->regs->ctl);
3403
3404         /* print dev register info */
3405         print_regs(dev);
3406
3407         return 0;
3408
3409 finished:
3410         return retval;
3411 }
3412
3413 /* Initiates a remote wakeup */
3414 static int udc_remote_wakeup(struct udc *dev)
3415 {
3416         unsigned long flags;
3417         u32 tmp;
3418
3419         DBG(dev, "UDC initiates remote wakeup\n");
3420
3421         spin_lock_irqsave(&dev->lock, flags);
3422
3423         tmp = readl(&dev->regs->ctl);
3424         tmp |= AMD_BIT(UDC_DEVCTL_RES);
3425         writel(tmp, &dev->regs->ctl);
3426         tmp &= AMD_CLEAR_BIT(UDC_DEVCTL_RES);
3427         writel(tmp, &dev->regs->ctl);
3428
3429         spin_unlock_irqrestore(&dev->lock, flags);
3430         return 0;
3431 }
3432
3433 /* PCI device parameters */
3434 static const struct pci_device_id pci_id[] = {
3435         {
3436                 PCI_DEVICE(PCI_VENDOR_ID_AMD, 0x2096),
3437                 .class =        (PCI_CLASS_SERIAL_USB << 8) | 0xfe,
3438                 .class_mask =   0xffffffff,
3439         },
3440         {},
3441 };
3442 MODULE_DEVICE_TABLE(pci, pci_id);
3443
3444 /* PCI functions */
3445 static struct pci_driver udc_pci_driver = {
3446         .name =         (char *) name,
3447         .id_table =     pci_id,
3448         .probe =        udc_pci_probe,
3449         .remove =       udc_pci_remove,
3450 };
3451
3452 /* Inits driver */
3453 static int __init init(void)
3454 {
3455         return pci_register_driver(&udc_pci_driver);
3456 }
3457 module_init(init);
3458
3459 /* Cleans driver */
3460 static void __exit cleanup(void)
3461 {
3462         pci_unregister_driver(&udc_pci_driver);
3463 }
3464 module_exit(cleanup);
3465
3466 MODULE_DESCRIPTION(UDC_MOD_DESCRIPTION);
3467 MODULE_AUTHOR("Thomas Dahlmann");
3468 MODULE_LICENSE("GPL");
3469