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/version.h>
  48 #include <linux/delay.h>
  49 #include <linux/ioport.h>
  50 #include <linux/sched.h>
  51 #include <linux/slab.h>
  52 #include <linux/smp_lock.h>
  53 #include <linux/errno.h>
  54 #include <linux/init.h>
  55 #include <linux/timer.h>
  56 #include <linux/list.h>
  57 #include <linux/interrupt.h>
  58 #include <linux/ioctl.h>
  59 #include <linux/fs.h>
  60 #include <linux/dmapool.h>
  61 #include <linux/moduleparam.h>
  62 #include <linux/device.h>
  63 #include <linux/io.h>
  64 #include <linux/irq.h>
  65
  66 #include <asm/byteorder.h>
  67 #include <asm/system.h>
  68 #include <asm/unaligned.h>
  69
  70 /* gadget stack */
  71 #include <linux/usb/ch9.h>
  72 #include <linux/usb_gadget.h>
  73
  74 /* udc specific */
  75 #include "amd5536udc.h"
  76
  77
  78 static void udc_tasklet_disconnect(unsigned long);
  79 static void empty_req_queue(struct udc_ep *);
  80 static int udc_probe(struct udc *dev);
  81 static void udc_basic_init(struct udc *dev);
  82 static void udc_setup_endpoints(struct udc *dev);
  83 static void udc_soft_reset(struct udc *dev);
  84 static struct udc_request *udc_alloc_bna_dummy(struct udc_ep *ep);
  85 static void udc_free_request(struct usb_ep *usbep, struct usb_request *usbreq);
  86 static int udc_free_dma_chain(struct udc *dev, struct udc_request *req);
  87 static int udc_create_dma_chain(struct udc_ep *ep, struct udc_request *req,
  88                                 unsigned long buf_len, gfp_t gfp_flags);
  89 static int udc_remote_wakeup(struct udc *dev);
  90 static int udc_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id);
  91 static void udc_pci_remove(struct pci_dev *pdev);
  92
  93 /* description */
  94 static const char mod_desc[] = UDC_MOD_DESCRIPTION;
  95 static const char name[] = "amd5536udc";
  96
  97 /* structure to hold endpoint function pointers */
  98 static const struct usb_ep_ops udc_ep_ops;
  99
 100 /* received setup data */
 101 static union udc_setup_data setup_data;
 102
 103 /* pointer to device object */
 104 static struct udc *udc;
 105
 106 /* irq spin lock for soft reset */
 107 static DEFINE_SPINLOCK(udc_irq_spinlock);
 108 /* stall spin lock */
 109 static DEFINE_SPINLOCK(udc_stall_spinlock);
 110
 111 /*
 112 * slave mode: pending bytes in rx fifo after nyet,
 113 * used if EPIN irq came but no req was available
 114 */
 115 static unsigned int udc_rxfifo_pending;
 116
 117 /* count soft resets after suspend to avoid loop */
 118 static int soft_reset_occured;
 119 static int soft_reset_after_usbreset_occured;
 120
 121 /* timer */
 122 static struct timer_list udc_timer;
 123 static int stop_timer;
 124
 125 /* set_rde -- Is used to control enabling of RX DMA. Problem is
 126  * that UDC has only one bit (RDE) to enable/disable RX DMA for
 127  * all OUT endpoints. So we have to handle race conditions like
 128  * when OUT data reaches the fifo but no request was queued yet.
 129  * This cannot be solved by letting the RX DMA disabled until a
 130  * request gets queued because there may be other OUT packets
 131  * in the FIFO (important for not blocking control traffic).
 132  * The value of set_rde controls the correspondig timer.
 133  *
 134  * set_rde -1 == not used, means it is alloed to be set to 0 or 1
 135  * set_rde  0 == do not touch RDE, do no start the RDE timer
 136  * set_rde  1 == timer function will look whether FIFO has data
 137  * set_rde  2 == set by timer function to enable RX DMA on next call
 138  */
 139 static int set_rde = -1;
 140
 141 static DECLARE_COMPLETION(on_exit);
 142 static struct timer_list udc_pollstall_timer;
 143 static int stop_pollstall_timer;
 144 static DECLARE_COMPLETION(on_pollstall_exit);
 145
 146 /* tasklet for usb disconnect */
 147 static DECLARE_TASKLET(disconnect_tasklet, udc_tasklet_disconnect,
 148                 (unsigned long) &udc);
 149
 150
 151 /* endpoint names used for print */
 152 static const char ep0_string[] = "ep0in";
 153 static const char *ep_string[] = {
 154         ep0_string,
 155         "ep1in-int", "ep2in-bulk", "ep3in-bulk", "ep4in-bulk", "ep5in-bulk",
 156         "ep6in-bulk", "ep7in-bulk", "ep8in-bulk", "ep9in-bulk", "ep10in-bulk",
 157         "ep11in-bulk", "ep12in-bulk", "ep13in-bulk", "ep14in-bulk",
 158         "ep15in-bulk", "ep0out", "ep1out-bulk", "ep2out-bulk", "ep3out-bulk",
 159         "ep4out-bulk", "ep5out-bulk", "ep6out-bulk", "ep7out-bulk",
 160         "ep8out-bulk", "ep9out-bulk", "ep10out-bulk", "ep11out-bulk",
 161         "ep12out-bulk", "ep13out-bulk", "ep14out-bulk", "ep15out-bulk"
 162 };
 163
 164 /* DMA usage flag */
 165 static int use_dma = 1;
 166 /* packet per buffer dma */
 167 static int use_dma_ppb = 1;
 168 /* with per descr. update */
 169 static int use_dma_ppb_du;
 170 /* buffer fill mode */
 171 static int use_dma_bufferfill_mode;
 172 /* full speed only mode */
 173 static int use_fullspeed;
 174 /* tx buffer size for high speed */
 175 static unsigned long hs_tx_buf = UDC_EPIN_BUFF_SIZE;
 176
 177 /* module parameters */
 178 module_param(use_dma, bool, S_IRUGO);
 179 MODULE_PARM_DESC(use_dma, "true for DMA");
 180 module_param(use_dma_ppb, bool, S_IRUGO);
 181 MODULE_PARM_DESC(use_dma_ppb, "true for DMA in packet per buffer mode");
 182 module_param(use_dma_ppb_du, bool, S_IRUGO);
 183 MODULE_PARM_DESC(use_dma_ppb_du,
 184         "true for DMA in packet per buffer mode with descriptor update");
 185 module_param(use_fullspeed, bool, S_IRUGO);
 186 MODULE_PARM_DESC(use_fullspeed, "true for fullspeed only");
 187
 188 /*---------------------------------------------------------------------------*/
 189 /* Prints UDC device registers and endpoint irq registers */
 190 static void print_regs(struct udc *dev)
 191 {
 192         DBG(dev, "------- Device registers -------\n");
 193         DBG(dev, "dev config     = %08x\n", readl(&dev->regs->cfg));
 194         DBG(dev, "dev control    = %08x\n", readl(&dev->regs->ctl));
 195         DBG(dev, "dev status     = %08x\n", readl(&dev->regs->sts));
 196         DBG(dev, "\n");
 197         DBG(dev, "dev int's      = %08x\n", readl(&dev->regs->irqsts));
 198         DBG(dev, "dev intmask    = %08x\n", readl(&dev->regs->irqmsk));
 199         DBG(dev, "\n");
 200         DBG(dev, "dev ep int's   = %08x\n", readl(&dev->regs->ep_irqsts));
 201         DBG(dev, "dev ep intmask = %08x\n", readl(&dev->regs->ep_irqmsk));
 202         DBG(dev, "\n");
 203         DBG(dev, "USE DMA        = %d\n", use_dma);
 204         if (use_dma && use_dma_ppb && !use_dma_ppb_du) {
 205                 DBG(dev, "DMA mode       = PPBNDU (packet per buffer "
 206                         "WITHOUT desc. update)\n");
 207                 dev_info(&dev->pdev->dev, "DMA mode (%s)\n", "PPBNDU");
 208         } else if (use_dma && use_dma_ppb_du && use_dma_ppb_du) {
 209                 DBG(dev, "DMA mode       = PPBDU (packet per buffer "
 210                         "WITH desc. update)\n");
 211                 dev_info(&dev->pdev->dev, "DMA mode (%s)\n", "PPBDU");
 212         }
 213         if (use_dma && use_dma_bufferfill_mode) {
 214                 DBG(dev, "DMA mode       = BF (buffer fill mode)\n");
 215                 dev_info(&dev->pdev->dev, "DMA mode (%s)\n", "BF");
 216         }
 217         if (!use_dma) {
 218                 dev_info(&dev->pdev->dev, "FIFO mode\n");
 219         }
 220         DBG(dev, "-------------------------------------------------------\n");
 221 }
 222
 223 /* Masks unused interrupts */
 224 static int udc_mask_unused_interrupts(struct udc *dev)
 225 {
 226         u32 tmp;
 227
 228         /* mask all dev interrupts */
 229         tmp =   AMD_BIT(UDC_DEVINT_SVC) |
 230                 AMD_BIT(UDC_DEVINT_ENUM) |
 231                 AMD_BIT(UDC_DEVINT_US) |
 232                 AMD_BIT(UDC_DEVINT_UR) |
 233                 AMD_BIT(UDC_DEVINT_ES) |
 234                 AMD_BIT(UDC_DEVINT_SI) |
 235                 AMD_BIT(UDC_DEVINT_SOF)|
 236                 AMD_BIT(UDC_DEVINT_SC);
 237         writel(tmp, &dev->regs->irqmsk);
 238
 239         /* mask all ep interrupts */
 240         writel(UDC_EPINT_MSK_DISABLE_ALL, &dev->regs->ep_irqmsk);
 241
 242         return 0;
 243 }
 244
 245 /* Enables endpoint 0 interrupts */
 246 static int udc_enable_ep0_interrupts(struct udc *dev)
 247 {
 248         u32 tmp;
 249
 250         DBG(dev, "udc_enable_ep0_interrupts()\n");
 251
 252         /* read irq mask */
 253         tmp = readl(&dev->regs->ep_irqmsk);
 254         /* enable ep0 irq's */
 255         tmp &= AMD_UNMASK_BIT(UDC_EPINT_IN_EP0)
 256                 & AMD_UNMASK_BIT(UDC_EPINT_OUT_EP0);
 257         writel(tmp, &dev->regs->ep_irqmsk);
 258
 259         return 0;
 260 }
 261
 262 /* Enables device interrupts for SET_INTF and SET_CONFIG */
 263 static int udc_enable_dev_setup_interrupts(struct udc *dev)
 264 {
 265         u32 tmp;
 266
 267         DBG(dev, "enable device interrupts for setup data\n");
 268
 269         /* read irq mask */
 270         tmp = readl(&dev->regs->irqmsk);
 271
 272         /* enable SET_INTERFACE, SET_CONFIG and other needed irq's */
 273         tmp &= AMD_UNMASK_BIT(UDC_DEVINT_SI)
 274                 & AMD_UNMASK_BIT(UDC_DEVINT_SC)
 275                 & AMD_UNMASK_BIT(UDC_DEVINT_UR)
 276                 & AMD_UNMASK_BIT(UDC_DEVINT_SVC)
 277                 & AMD_UNMASK_BIT(UDC_DEVINT_ENUM);
 278         writel(tmp, &dev->regs->irqmsk);
 279
 280         return 0;
 281 }
 282
 283 /* Calculates fifo start of endpoint based on preceeding endpoints */
 284 static int udc_set_txfifo_addr(struct udc_ep *ep)
 285 {
 286         struct udc      *dev;
 287         u32 tmp;
 288         int i;
 289
 290         if (!ep || !(ep->in))
 291                 return -EINVAL;
 292
 293         dev = ep->dev;
 294         ep->txfifo = dev->txfifo;
 295
 296         /* traverse ep's */
 297         for (i = 0; i < ep->num; i++) {
 298                 if (dev->ep[i].regs) {
 299                         /* read fifo size */
 300                         tmp = readl(&dev->ep[i].regs->bufin_framenum);
 301                         tmp = AMD_GETBITS(tmp, UDC_EPIN_BUFF_SIZE);
 302                         ep->txfifo += tmp;
 303                 }
 304         }
 305         return 0;
 306 }
 307
 308 /* CNAK pending field: bit0 = ep0in, bit16 = ep0out */
 309 static u32 cnak_pending;
 310
 311 static void UDC_QUEUE_CNAK(struct udc_ep *ep, unsigned num)
 312 {
 313         if (readl(&ep->regs->ctl) & AMD_BIT(UDC_EPCTL_NAK)) {
 314                 DBG(ep->dev, "NAK could not be cleared for ep%d\n", num);
 315                 cnak_pending |= 1 << (num);
 316                 ep->naking = 1;
 317         } else
 318                 cnak_pending = cnak_pending & (~(1 << (num)));
 319 }
 320
 321
 322 /* Enables endpoint, is called by gadget driver */
 323 static int
 324 udc_ep_enable(struct usb_ep *usbep, const struct usb_endpoint_descriptor *desc)
 325 {
 326         struct udc_ep           *ep;
 327         struct udc              *dev;
 328         u32                     tmp;
 329         unsigned long           iflags;
 330         u8 udc_csr_epix;
 331
 332         if (!usbep
 333                         || usbep->name == ep0_string
 334                         || !desc
 335                         || desc->bDescriptorType != USB_DT_ENDPOINT)
 336                 return -EINVAL;
 337
 338         ep = container_of(usbep, struct udc_ep, ep);
 339         dev = ep->dev;
 340
 341         DBG(dev, "udc_ep_enable() ep %d\n", ep->num);
 342
 343         if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN)
 344                 return -ESHUTDOWN;
 345
 346         spin_lock_irqsave(&dev->lock, iflags);
 347         ep->desc = desc;
 348
 349         ep->halted = 0;
 350
 351         /* set traffic type */
 352         tmp = readl(&dev->ep[ep->num].regs->ctl);
 353         tmp = AMD_ADDBITS(tmp, desc->bmAttributes, UDC_EPCTL_ET);
 354         writel(tmp, &dev->ep[ep->num].regs->ctl);
 355
 356         /* set max packet size */
 357         tmp = readl(&dev->ep[ep->num].regs->bufout_maxpkt);
 358         tmp = AMD_ADDBITS(tmp, desc->wMaxPacketSize, UDC_EP_MAX_PKT_SIZE);
 359         ep->ep.maxpacket = desc->wMaxPacketSize;
 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                                 desc->wMaxPacketSize * 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, desc->wMaxPacketSize,
 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, desc->wMaxPacketSize, 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 = __constant_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                 }
1217
1218         } else if (ep->dma) {
1219
1220                 /*
1221                  * prep_dma not used for OUT ep's, this is not possible
1222                  * for PPB modes, because of chain creation reasons
1223                  */
1224                 if (ep->in) {
1225                         retval = prep_dma(ep, req, gfp);
1226                         if (retval != 0)
1227                                 goto finished;
1228                 }
1229         }
1230         VDBG(dev, "list_add\n");
1231         /* add request to ep queue */
1232         if (req) {
1233
1234                 list_add_tail(&req->queue, &ep->queue);
1235
1236                 /* open rxfifo if out data queued */
1237                 if (open_rxfifo) {
1238                         /* enable DMA */
1239                         req->dma_going = 1;
1240                         udc_set_rde(dev);
1241                         if (ep->num != UDC_EP0OUT_IX)
1242                                 dev->data_ep_queued = 1;
1243                 }
1244                 /* stop OUT naking */
1245                 if (!ep->in) {
1246                         if (!use_dma && udc_rxfifo_pending) {
1247                                 DBG(dev, "udc_queue(): pending bytes in"
1248                                         "rxfifo after nyet\n");
1249                                 /*
1250                                  * read pending bytes afer nyet:
1251                                  * referring to isr
1252                                  */
1253                                 if (udc_rxfifo_read(ep, req)) {
1254                                         /* finish */
1255                                         complete_req(ep, req, 0);
1256                                 }
1257                                 udc_rxfifo_pending = 0;
1258
1259                         }
1260                 }
1261         }
1262
1263 finished:
1264         spin_unlock_irqrestore(&dev->lock, iflags);
1265         return retval;
1266 }
1267
1268 /* Empty request queue of an endpoint; caller holds spinlock */
1269 static void empty_req_queue(struct udc_ep *ep)
1270 {
1271         struct udc_request      *req;
1272
1273         ep->halted = 1;
1274         while (!list_empty(&ep->queue)) {
1275                 req = list_entry(ep->queue.next,
1276                         struct udc_request,
1277                         queue);
1278                 complete_req(ep, req, -ESHUTDOWN);
1279         }
1280 }
1281
1282 /* Dequeues a request packet, called by gadget driver */
1283 static int udc_dequeue(struct usb_ep *usbep, struct usb_request *usbreq)
1284 {
1285         struct udc_ep           *ep;
1286         struct udc_request      *req;
1287         unsigned                halted;
1288         unsigned long           iflags;
1289
1290         ep = container_of(usbep, struct udc_ep, ep);
1291         if (!usbep || !usbreq || (!ep->desc && (ep->num != 0
1292                                 && ep->num != UDC_EP0OUT_IX)))
1293                 return -EINVAL;
1294
1295         req = container_of(usbreq, struct udc_request, req);
1296
1297         spin_lock_irqsave(&ep->dev->lock, iflags);
1298         halted = ep->halted;
1299         ep->halted = 1;
1300         /* request in processing or next one */
1301         if (ep->queue.next == &req->queue) {
1302                 if (ep->dma && req->dma_going) {
1303                         if (ep->in)
1304                                 ep->cancel_transfer = 1;
1305                         else {
1306                                 u32 tmp;
1307                                 u32 dma_sts;
1308                                 /* stop potential receive DMA */
1309                                 tmp = readl(&udc->regs->ctl);
1310                                 writel(tmp & AMD_UNMASK_BIT(UDC_DEVCTL_RDE),
1311                                                         &udc->regs->ctl);
1312                                 /*
1313                                  * Cancel transfer later in ISR
1314                                  * if descriptor was touched.
1315                                  */
1316                                 dma_sts = AMD_GETBITS(req->td_data->status,
1317                                                         UDC_DMA_OUT_STS_BS);
1318                                 if (dma_sts != UDC_DMA_OUT_STS_BS_HOST_READY)
1319                                         ep->cancel_transfer = 1;
1320                                 else {
1321                                         udc_init_bna_dummy(ep->req);
1322                                         writel(ep->bna_dummy_req->td_phys,
1323                                                 &ep->regs->desptr);
1324                                 }
1325                                 writel(tmp, &udc->regs->ctl);
1326                         }
1327                 }
1328         }
1329         complete_req(ep, req, -ECONNRESET);
1330         ep->halted = halted;
1331
1332         spin_unlock_irqrestore(&ep->dev->lock, iflags);
1333         return 0;
1334 }
1335
1336 /* Halt or clear halt of endpoint */
1337 static int
1338 udc_set_halt(struct usb_ep *usbep, int halt)
1339 {
1340         struct udc_ep   *ep;
1341         u32 tmp;
1342         unsigned long iflags;
1343         int retval = 0;
1344
1345         if (!usbep)
1346                 return -EINVAL;
1347
1348         pr_debug("set_halt %s: halt=%d\n", usbep->name, halt);
1349
1350         ep = container_of(usbep, struct udc_ep, ep);
1351         if (!ep->desc && (ep->num != 0 && ep->num != UDC_EP0OUT_IX))
1352                 return -EINVAL;
1353         if (!ep->dev->driver || ep->dev->gadget.speed == USB_SPEED_UNKNOWN)
1354                 return -ESHUTDOWN;
1355
1356         spin_lock_irqsave(&udc_stall_spinlock, iflags);
1357         /* halt or clear halt */
1358         if (halt) {
1359                 if (ep->num == 0)
1360                         ep->dev->stall_ep0in = 1;
1361                 else {
1362                         /*
1363                          * set STALL
1364                          * rxfifo empty not taken into acount
1365                          */
1366                         tmp = readl(&ep->regs->ctl);
1367                         tmp |= AMD_BIT(UDC_EPCTL_S);
1368                         writel(tmp, &ep->regs->ctl);
1369                         ep->halted = 1;
1370
1371                         /* setup poll timer */
1372                         if (!timer_pending(&udc_pollstall_timer)) {
1373                                 udc_pollstall_timer.expires = jiffies +
1374                                         HZ * UDC_POLLSTALL_TIMER_USECONDS
1375                                         / (1000 * 1000);
1376                                 if (!stop_pollstall_timer) {
1377                                         DBG(ep->dev, "start polltimer\n");
1378                                         add_timer(&udc_pollstall_timer);
1379                                 }
1380                         }
1381                 }
1382         } else {
1383                 /* ep is halted by set_halt() before */
1384                 if (ep->halted) {
1385                         tmp = readl(&ep->regs->ctl);
1386                         /* clear stall bit */
1387                         tmp = tmp & AMD_CLEAR_BIT(UDC_EPCTL_S);
1388                         /* clear NAK by writing CNAK */
1389                         tmp |= AMD_BIT(UDC_EPCTL_CNAK);
1390                         writel(tmp, &ep->regs->ctl);
1391                         ep->halted = 0;
1392                         UDC_QUEUE_CNAK(ep, ep->num);
1393                 }
1394         }
1395         spin_unlock_irqrestore(&udc_stall_spinlock, iflags);
1396         return retval;
1397 }
1398
1399 /* gadget interface */
1400 static const struct usb_ep_ops udc_ep_ops = {
1401         .enable         = udc_ep_enable,
1402         .disable        = udc_ep_disable,
1403
1404         .alloc_request  = udc_alloc_request,
1405         .free_request   = udc_free_request,
1406
1407         .queue          = udc_queue,
1408         .dequeue        = udc_dequeue,
1409
1410         .set_halt       = udc_set_halt,
1411         /* fifo ops not implemented */
1412 };
1413
1414 /*-------------------------------------------------------------------------*/
1415
1416 /* Get frame counter (not implemented) */
1417 static int udc_get_frame(struct usb_gadget *gadget)
1418 {
1419         return -EOPNOTSUPP;
1420 }
1421
1422 /* Remote wakeup gadget interface */
1423 static int udc_wakeup(struct usb_gadget *gadget)
1424 {
1425         struct udc              *dev;
1426
1427         if (!gadget)
1428                 return -EINVAL;
1429         dev = container_of(gadget, struct udc, gadget);
1430         udc_remote_wakeup(dev);
1431
1432         return 0;
1433 }
1434
1435 /* gadget operations */
1436 static const struct usb_gadget_ops udc_ops = {
1437         .wakeup         = udc_wakeup,
1438         .get_frame      = udc_get_frame,
1439 };
1440
1441 /* Setups endpoint parameters, adds endpoints to linked list */
1442 static void make_ep_lists(struct udc *dev)
1443 {
1444         /* make gadget ep lists */
1445         INIT_LIST_HEAD(&dev->gadget.ep_list);
1446         list_add_tail(&dev->ep[UDC_EPIN_STATUS_IX].ep.ep_list,
1447                                                 &dev->gadget.ep_list);
1448         list_add_tail(&dev->ep[UDC_EPIN_IX].ep.ep_list,
1449                                                 &dev->gadget.ep_list);
1450         list_add_tail(&dev->ep[UDC_EPOUT_IX].ep.ep_list,
1451                                                 &dev->gadget.ep_list);
1452
1453         /* fifo config */
1454         dev->ep[UDC_EPIN_STATUS_IX].fifo_depth = UDC_EPIN_SMALLINT_BUFF_SIZE;
1455         if (dev->gadget.speed == USB_SPEED_FULL)
1456                 dev->ep[UDC_EPIN_IX].fifo_depth = UDC_FS_EPIN_BUFF_SIZE;
1457         else if (dev->gadget.speed == USB_SPEED_HIGH)
1458                 dev->ep[UDC_EPIN_IX].fifo_depth = hs_tx_buf;
1459         dev->ep[UDC_EPOUT_IX].fifo_depth = UDC_RXFIFO_SIZE;
1460 }
1461
1462 /* init registers at driver load time */
1463 static int startup_registers(struct udc *dev)
1464 {
1465         u32 tmp;
1466
1467         /* init controller by soft reset */
1468         udc_soft_reset(dev);
1469
1470         /* mask not needed interrupts */
1471         udc_mask_unused_interrupts(dev);
1472
1473         /* put into initial config */
1474         udc_basic_init(dev);
1475         /* link up all endpoints */
1476         udc_setup_endpoints(dev);
1477
1478         /* program speed */
1479         tmp = readl(&dev->regs->cfg);
1480         if (use_fullspeed) {
1481                 tmp = AMD_ADDBITS(tmp, UDC_DEVCFG_SPD_FS, UDC_DEVCFG_SPD);
1482         } else {
1483                 tmp = AMD_ADDBITS(tmp, UDC_DEVCFG_SPD_HS, UDC_DEVCFG_SPD);
1484         }
1485         writel(tmp, &dev->regs->cfg);
1486
1487         return 0;
1488 }
1489
1490 /* Inits UDC context */
1491 static void udc_basic_init(struct udc *dev)
1492 {
1493         u32     tmp;
1494
1495         DBG(dev, "udc_basic_init()\n");
1496
1497         dev->gadget.speed = USB_SPEED_UNKNOWN;
1498
1499         /* stop RDE timer */
1500         if (timer_pending(&udc_timer)) {
1501                 set_rde = 0;
1502                 mod_timer(&udc_timer, jiffies - 1);
1503         }
1504         /* stop poll stall timer */
1505         if (timer_pending(&udc_pollstall_timer)) {
1506                 mod_timer(&udc_pollstall_timer, jiffies - 1);
1507         }
1508         /* disable DMA */
1509         tmp = readl(&dev->regs->ctl);
1510         tmp &= AMD_UNMASK_BIT(UDC_DEVCTL_RDE);
1511         tmp &= AMD_UNMASK_BIT(UDC_DEVCTL_TDE);
1512         writel(tmp, &dev->regs->ctl);
1513
1514         /* enable dynamic CSR programming */
1515         tmp = readl(&dev->regs->cfg);
1516         tmp |= AMD_BIT(UDC_DEVCFG_CSR_PRG);
1517         /* set self powered */
1518         tmp |= AMD_BIT(UDC_DEVCFG_SP);
1519         /* set remote wakeupable */
1520         tmp |= AMD_BIT(UDC_DEVCFG_RWKP);
1521         writel(tmp, &dev->regs->cfg);
1522
1523         make_ep_lists(dev);
1524
1525         dev->data_ep_enabled = 0;
1526         dev->data_ep_queued = 0;
1527 }
1528
1529 /* Sets initial endpoint parameters */
1530 static void udc_setup_endpoints(struct udc *dev)
1531 {
1532         struct udc_ep   *ep;
1533         u32     tmp;
1534         u32     reg;
1535
1536         DBG(dev, "udc_setup_endpoints()\n");
1537
1538         /* read enum speed */
1539         tmp = readl(&dev->regs->sts);
1540         tmp = AMD_GETBITS(tmp, UDC_DEVSTS_ENUM_SPEED);
1541         if (tmp == UDC_DEVSTS_ENUM_SPEED_HIGH) {
1542                 dev->gadget.speed = USB_SPEED_HIGH;
1543         } else if (tmp == UDC_DEVSTS_ENUM_SPEED_FULL) {
1544                 dev->gadget.speed = USB_SPEED_FULL;
1545         }
1546
1547         /* set basic ep parameters */
1548         for (tmp = 0; tmp < UDC_EP_NUM; tmp++) {
1549                 ep = &dev->ep[tmp];
1550                 ep->dev = dev;
1551                 ep->ep.name = ep_string[tmp];
1552                 ep->num = tmp;
1553                 /* txfifo size is calculated at enable time */
1554                 ep->txfifo = dev->txfifo;
1555
1556                 /* fifo size */
1557                 if (tmp < UDC_EPIN_NUM) {
1558                         ep->fifo_depth = UDC_TXFIFO_SIZE;
1559                         ep->in = 1;
1560                 } else {
1561                         ep->fifo_depth = UDC_RXFIFO_SIZE;
1562                         ep->in = 0;
1563
1564                 }
1565                 ep->regs = &dev->ep_regs[tmp];
1566                 /*
1567                  * ep will be reset only if ep was not enabled before to avoid
1568                  * disabling ep interrupts when ENUM interrupt occurs but ep is
1569                  * not enabled by gadget driver
1570                  */
1571                 if (!ep->desc) {
1572                         ep_init(dev->regs, ep);
1573                 }
1574
1575                 if (use_dma) {
1576                         /*
1577                          * ep->dma is not really used, just to indicate that
1578                          * DMA is active: remove this
1579                          * dma regs = dev control regs
1580                          */
1581                         ep->dma = &dev->regs->ctl;
1582
1583                         /* nak OUT endpoints until enable - not for ep0 */
1584                         if (tmp != UDC_EP0IN_IX && tmp != UDC_EP0OUT_IX
1585                                                 && tmp > UDC_EPIN_NUM) {
1586                                 /* set NAK */
1587                                 reg = readl(&dev->ep[tmp].regs->ctl);
1588                                 reg |= AMD_BIT(UDC_EPCTL_SNAK);
1589                                 writel(reg, &dev->ep[tmp].regs->ctl);
1590                                 dev->ep[tmp].naking = 1;
1591
1592                         }
1593                 }
1594         }
1595         /* EP0 max packet */
1596         if (dev->gadget.speed == USB_SPEED_FULL) {
1597                 dev->ep[UDC_EP0IN_IX].ep.maxpacket = UDC_FS_EP0IN_MAX_PKT_SIZE;
1598                 dev->ep[UDC_EP0OUT_IX].ep.maxpacket =
1599                                                 UDC_FS_EP0OUT_MAX_PKT_SIZE;
1600         } else if (dev->gadget.speed == USB_SPEED_HIGH) {
1601                 dev->ep[UDC_EP0IN_IX].ep.maxpacket = UDC_EP0IN_MAX_PKT_SIZE;
1602                 dev->ep[UDC_EP0OUT_IX].ep.maxpacket = UDC_EP0OUT_MAX_PKT_SIZE;
1603         }
1604
1605         /*
1606          * with suspend bug workaround, ep0 params for gadget driver
1607          * are set at gadget driver bind() call
1608          */
1609         dev->gadget.ep0 = &dev->ep[UDC_EP0IN_IX].ep;
1610         dev->ep[UDC_EP0IN_IX].halted = 0;
1611         INIT_LIST_HEAD(&dev->gadget.ep0->ep_list);
1612
1613         /* init cfg/alt/int */
1614         dev->cur_config = 0;
1615         dev->cur_intf = 0;
1616         dev->cur_alt = 0;
1617 }
1618
1619 /* Bringup after Connect event, initial bringup to be ready for ep0 events */
1620 static void usb_connect(struct udc *dev)
1621 {
1622
1623         dev_info(&dev->pdev->dev, "USB Connect\n");
1624
1625         dev->connected = 1;
1626
1627         /* put into initial config */
1628         udc_basic_init(dev);
1629
1630         /* enable device setup interrupts */
1631         udc_enable_dev_setup_interrupts(dev);
1632 }
1633
1634 /*
1635  * Calls gadget with disconnect event and resets the UDC and makes
1636  * initial bringup to be ready for ep0 events
1637  */
1638 static void usb_disconnect(struct udc *dev)
1639 {
1640
1641         dev_info(&dev->pdev->dev, "USB Disconnect\n");
1642
1643         dev->connected = 0;
1644
1645         /* mask interrupts */
1646         udc_mask_unused_interrupts(dev);
1647
1648         /* REVISIT there doesn't seem to be a point to having this
1649          * talk to a tasklet ... do it directly, we already hold
1650          * the spinlock needed to process the disconnect.
1651          */
1652
1653         tasklet_schedule(&disconnect_tasklet);
1654 }
1655
1656 /* Tasklet for disconnect to be outside of interrupt context */
1657 static void udc_tasklet_disconnect(unsigned long par)
1658 {
1659         struct udc *dev = (struct udc *)(*((struct udc **) par));
1660         u32 tmp;
1661
1662         DBG(dev, "Tasklet disconnect\n");
1663         spin_lock_irq(&dev->lock);
1664
1665         if (dev->driver) {
1666                 spin_unlock(&dev->lock);
1667                 dev->driver->disconnect(&dev->gadget);
1668                 spin_lock(&dev->lock);
1669
1670                 /* empty queues */
1671                 for (tmp = 0; tmp < UDC_EP_NUM; tmp++) {
1672                         empty_req_queue(&dev->ep[tmp]);
1673                 }
1674
1675         }
1676
1677         /* disable ep0 */
1678         ep_init(dev->regs,
1679                         &dev->ep[UDC_EP0IN_IX]);
1680
1681
1682         if (!soft_reset_occured) {
1683                 /* init controller by soft reset */
1684                 udc_soft_reset(dev);
1685                 soft_reset_occured++;
1686         }
1687
1688         /* re-enable dev interrupts */
1689         udc_enable_dev_setup_interrupts(dev);
1690         /* back to full speed ? */
1691         if (use_fullspeed) {
1692                 tmp = readl(&dev->regs->cfg);
1693                 tmp = AMD_ADDBITS(tmp, UDC_DEVCFG_SPD_FS, UDC_DEVCFG_SPD);
1694                 writel(tmp, &dev->regs->cfg);
1695         }
1696
1697         spin_unlock_irq(&dev->lock);
1698 }
1699
1700 /* Reset the UDC core */
1701 static void udc_soft_reset(struct udc *dev)
1702 {
1703         unsigned long   flags;
1704
1705         DBG(dev, "Soft reset\n");
1706         /*
1707          * reset possible waiting interrupts, because int.
1708          * status is lost after soft reset,
1709          * ep int. status reset
1710          */
1711         writel(UDC_EPINT_MSK_DISABLE_ALL, &dev->regs->ep_irqsts);
1712         /* device int. status reset */
1713         writel(UDC_DEV_MSK_DISABLE, &dev->regs->irqsts);
1714
1715         spin_lock_irqsave(&udc_irq_spinlock, flags);
1716         writel(AMD_BIT(UDC_DEVCFG_SOFTRESET), &dev->regs->cfg);
1717         readl(&dev->regs->cfg);
1718         spin_unlock_irqrestore(&udc_irq_spinlock, flags);
1719
1720 }
1721
1722 /* RDE timer callback to set RDE bit */
1723 static void udc_timer_function(unsigned long v)
1724 {
1725         u32 tmp;
1726
1727         spin_lock_irq(&udc_irq_spinlock);
1728
1729         if (set_rde > 0) {
1730                 /*
1731                  * open the fifo if fifo was filled on last timer call
1732                  * conditionally
1733                  */
1734                 if (set_rde > 1) {
1735                         /* set RDE to receive setup data */
1736                         tmp = readl(&udc->regs->ctl);
1737                         tmp |= AMD_BIT(UDC_DEVCTL_RDE);
1738                         writel(tmp, &udc->regs->ctl);
1739                         set_rde = -1;
1740                 } else if (readl(&udc->regs->sts)
1741                                 & AMD_BIT(UDC_DEVSTS_RXFIFO_EMPTY)) {
1742                         /*
1743                          * if fifo empty setup polling, do not just
1744                          * open the fifo
1745                          */
1746                         udc_timer.expires = jiffies + HZ/UDC_RDE_TIMER_DIV;
1747                         if (!stop_timer) {
1748                                 add_timer(&udc_timer);
1749                         }
1750                 } else {
1751                         /*
1752                          * fifo contains data now, setup timer for opening
1753                          * the fifo when timer expires to be able to receive
1754                          * setup packets, when data packets gets queued by
1755                          * gadget layer then timer will forced to expire with
1756                          * set_rde=0 (RDE is set in udc_queue())
1757                          */
1758                         set_rde++;
1759                         /* debug: lhadmot_timer_start = 221070 */
1760                         udc_timer.expires = jiffies + HZ*UDC_RDE_TIMER_SECONDS;
1761                         if (!stop_timer) {
1762                                 add_timer(&udc_timer);
1763                         }
1764                 }
1765
1766         } else
1767                 set_rde = -1; /* RDE was set by udc_queue() */
1768         spin_unlock_irq(&udc_irq_spinlock);
1769         if (stop_timer)
1770                 complete(&on_exit);
1771
1772 }
1773
1774 /* Handle halt state, used in stall poll timer */
1775 static void udc_handle_halt_state(struct udc_ep *ep)
1776 {
1777         u32 tmp;
1778         /* set stall as long not halted */
1779         if (ep->halted == 1) {
1780                 tmp = readl(&ep->regs->ctl);
1781                 /* STALL cleared ? */
1782                 if (!(tmp & AMD_BIT(UDC_EPCTL_S))) {
1783                         /*
1784                          * FIXME: MSC spec requires that stall remains
1785                          * even on receivng of CLEAR_FEATURE HALT. So
1786                          * we would set STALL again here to be compliant.
1787                          * But with current mass storage drivers this does
1788                          * not work (would produce endless host retries).
1789                          * So we clear halt on CLEAR_FEATURE.
1790                          *
1791                         DBG(ep->dev, "ep %d: set STALL again\n", ep->num);
1792                         tmp |= AMD_BIT(UDC_EPCTL_S);
1793                         writel(tmp, &ep->regs->ctl);*/
1794
1795                         /* clear NAK by writing CNAK */
1796                         tmp |= AMD_BIT(UDC_EPCTL_CNAK);
1797                         writel(tmp, &ep->regs->ctl);
1798                         ep->halted = 0;
1799                         UDC_QUEUE_CNAK(ep, ep->num);
1800                 }
1801         }
1802 }
1803
1804 /* Stall timer callback to poll S bit and set it again after */
1805 static void udc_pollstall_timer_function(unsigned long v)
1806 {
1807         struct udc_ep *ep;
1808         int halted = 0;
1809
1810         spin_lock_irq(&udc_stall_spinlock);
1811         /*
1812          * only one IN and OUT endpoints are handled
1813          * IN poll stall
1814          */
1815         ep = &udc->ep[UDC_EPIN_IX];
1816         udc_handle_halt_state(ep);
1817         if (ep->halted)
1818                 halted = 1;
1819         /* OUT poll stall */
1820         ep = &udc->ep[UDC_EPOUT_IX];
1821         udc_handle_halt_state(ep);
1822         if (ep->halted)
1823                 halted = 1;
1824
1825         /* setup timer again when still halted */
1826         if (!stop_pollstall_timer && halted) {
1827                 udc_pollstall_timer.expires = jiffies +
1828                                         HZ * UDC_POLLSTALL_TIMER_USECONDS
1829                                         / (1000 * 1000);
1830                 add_timer(&udc_pollstall_timer);
1831         }
1832         spin_unlock_irq(&udc_stall_spinlock);
1833
1834         if (stop_pollstall_timer)
1835                 complete(&on_pollstall_exit);
1836 }
1837
1838 /* Inits endpoint 0 so that SETUP packets are processed */
1839 static void activate_control_endpoints(struct udc *dev)
1840 {
1841         u32 tmp;
1842
1843         DBG(dev, "activate_control_endpoints\n");
1844
1845         /* flush fifo */
1846         tmp = readl(&dev->ep[UDC_EP0IN_IX].regs->ctl);
1847         tmp |= AMD_BIT(UDC_EPCTL_F);
1848         writel(tmp, &dev->ep[UDC_EP0IN_IX].regs->ctl);
1849
1850         /* set ep0 directions */
1851         dev->ep[UDC_EP0IN_IX].in = 1;
1852         dev->ep[UDC_EP0OUT_IX].in = 0;
1853
1854         /* set buffer size (tx fifo entries) of EP0_IN */
1855         tmp = readl(&dev->ep[UDC_EP0IN_IX].regs->bufin_framenum);
1856         if (dev->gadget.speed == USB_SPEED_FULL)
1857                 tmp = AMD_ADDBITS(tmp, UDC_FS_EPIN0_BUFF_SIZE,
1858                                         UDC_EPIN_BUFF_SIZE);
1859         else if (dev->gadget.speed == USB_SPEED_HIGH)
1860                 tmp = AMD_ADDBITS(tmp, UDC_EPIN0_BUFF_SIZE,
1861                                         UDC_EPIN_BUFF_SIZE);
1862         writel(tmp, &dev->ep[UDC_EP0IN_IX].regs->bufin_framenum);
1863
1864         /* set max packet size of EP0_IN */
1865         tmp = readl(&dev->ep[UDC_EP0IN_IX].regs->bufout_maxpkt);
1866         if (dev->gadget.speed == USB_SPEED_FULL)
1867                 tmp = AMD_ADDBITS(tmp, UDC_FS_EP0IN_MAX_PKT_SIZE,
1868                                         UDC_EP_MAX_PKT_SIZE);
1869         else if (dev->gadget.speed == USB_SPEED_HIGH)
1870                 tmp = AMD_ADDBITS(tmp, UDC_EP0IN_MAX_PKT_SIZE,
1871                                 UDC_EP_MAX_PKT_SIZE);
1872         writel(tmp, &dev->ep[UDC_EP0IN_IX].regs->bufout_maxpkt);
1873
1874         /* set max packet size of EP0_OUT */
1875         tmp = readl(&dev->ep[UDC_EP0OUT_IX].regs->bufout_maxpkt);
1876         if (dev->gadget.speed == USB_SPEED_FULL)
1877                 tmp = AMD_ADDBITS(tmp, UDC_FS_EP0OUT_MAX_PKT_SIZE,
1878                                         UDC_EP_MAX_PKT_SIZE);
1879         else if (dev->gadget.speed == USB_SPEED_HIGH)
1880                 tmp = AMD_ADDBITS(tmp, UDC_EP0OUT_MAX_PKT_SIZE,
1881                                         UDC_EP_MAX_PKT_SIZE);
1882         writel(tmp, &dev->ep[UDC_EP0OUT_IX].regs->bufout_maxpkt);
1883
1884         /* set max packet size of EP0 in UDC CSR */
1885         tmp = readl(&dev->csr->ne[0]);
1886         if (dev->gadget.speed == USB_SPEED_FULL)
1887                 tmp = AMD_ADDBITS(tmp, UDC_FS_EP0OUT_MAX_PKT_SIZE,
1888                                         UDC_CSR_NE_MAX_PKT);
1889         else if (dev->gadget.speed == USB_SPEED_HIGH)
1890                 tmp = AMD_ADDBITS(tmp, UDC_EP0OUT_MAX_PKT_SIZE,
1891                                         UDC_CSR_NE_MAX_PKT);
1892         writel(tmp, &dev->csr->ne[0]);
1893
1894         if (use_dma) {
1895                 dev->ep[UDC_EP0OUT_IX].td->status |=
1896                         AMD_BIT(UDC_DMA_OUT_STS_L);
1897                 /* write dma desc address */
1898                 writel(dev->ep[UDC_EP0OUT_IX].td_stp_dma,
1899                         &dev->ep[UDC_EP0OUT_IX].regs->subptr);
1900                 writel(dev->ep[UDC_EP0OUT_IX].td_phys,
1901                         &dev->ep[UDC_EP0OUT_IX].regs->desptr);
1902                 /* stop RDE timer */
1903                 if (timer_pending(&udc_timer)) {
1904                         set_rde = 0;
1905                         mod_timer(&udc_timer, jiffies - 1);
1906                 }
1907                 /* stop pollstall timer */
1908                 if (timer_pending(&udc_pollstall_timer)) {
1909                         mod_timer(&udc_pollstall_timer, jiffies - 1);
1910                 }
1911                 /* enable DMA */
1912                 tmp = readl(&dev->regs->ctl);
1913                 tmp |= AMD_BIT(UDC_DEVCTL_MODE)
1914                                 | AMD_BIT(UDC_DEVCTL_RDE)
1915                                 | AMD_BIT(UDC_DEVCTL_TDE);
1916                 if (use_dma_bufferfill_mode) {
1917                         tmp |= AMD_BIT(UDC_DEVCTL_BF);
1918                 } else if (use_dma_ppb_du) {
1919                         tmp |= AMD_BIT(UDC_DEVCTL_DU);
1920                 }
1921                 writel(tmp, &dev->regs->ctl);
1922         }
1923
1924         /* clear NAK by writing CNAK for EP0IN */
1925         tmp = readl(&dev->ep[UDC_EP0IN_IX].regs->ctl);
1926         tmp |= AMD_BIT(UDC_EPCTL_CNAK);
1927         writel(tmp, &dev->ep[UDC_EP0IN_IX].regs->ctl);
1928         dev->ep[UDC_EP0IN_IX].naking = 0;
1929         UDC_QUEUE_CNAK(&dev->ep[UDC_EP0IN_IX], UDC_EP0IN_IX);
1930
1931         /* clear NAK by writing CNAK for EP0OUT */
1932         tmp = readl(&dev->ep[UDC_EP0OUT_IX].regs->ctl);
1933         tmp |= AMD_BIT(UDC_EPCTL_CNAK);
1934         writel(tmp, &dev->ep[UDC_EP0OUT_IX].regs->ctl);
1935         dev->ep[UDC_EP0OUT_IX].naking = 0;
1936         UDC_QUEUE_CNAK(&dev->ep[UDC_EP0OUT_IX], UDC_EP0OUT_IX);
1937 }
1938
1939 /* Make endpoint 0 ready for control traffic */
1940 static int setup_ep0(struct udc *dev)
1941 {
1942         activate_control_endpoints(dev);
1943         /* enable ep0 interrupts */
1944         udc_enable_ep0_interrupts(dev);
1945         /* enable device setup interrupts */
1946         udc_enable_dev_setup_interrupts(dev);
1947
1948         return 0;
1949 }
1950
1951 /* Called by gadget driver to register itself */
1952 int usb_gadget_register_driver(struct usb_gadget_driver *driver)
1953 {
1954         struct udc              *dev = udc;
1955         int                     retval;
1956         u32 tmp;
1957
1958         if (!driver || !driver->bind || !driver->setup
1959                         || driver->speed != USB_SPEED_HIGH)
1960                 return -EINVAL;
1961         if (!dev)
1962                 return -ENODEV;
1963         if (dev->driver)
1964                 return -EBUSY;
1965
1966         driver->driver.bus = NULL;
1967         dev->driver = driver;
1968         dev->gadget.dev.driver = &driver->driver;
1969
1970         retval = driver->bind(&dev->gadget);
1971
1972         /* Some gadget drivers use both ep0 directions.
1973          * NOTE: to gadget driver, ep0 is just one endpoint...
1974          */
1975         dev->ep[UDC_EP0OUT_IX].ep.driver_data =
1976                 dev->ep[UDC_EP0IN_IX].ep.driver_data;
1977
1978         if (retval) {
1979                 DBG(dev, "binding to %s returning %d\n",
1980                                 driver->driver.name, retval);
1981                 dev->driver = NULL;
1982                 dev->gadget.dev.driver = NULL;
1983                 return retval;
1984         }
1985
1986         /* get ready for ep0 traffic */
1987         setup_ep0(dev);
1988
1989         /* clear SD */
1990         tmp = readl(&dev->regs->ctl);
1991         tmp = tmp & AMD_CLEAR_BIT(UDC_DEVCTL_SD);
1992         writel(tmp, &dev->regs->ctl);
1993
1994         usb_connect(dev);
1995
1996         return 0;
1997 }
1998 EXPORT_SYMBOL(usb_gadget_register_driver);
1999
2000 /* shutdown requests and disconnect from gadget */
2001 static void
2002 shutdown(struct udc *dev, struct usb_gadget_driver *driver)
2003 __releases(dev->lock)
2004 __acquires(dev->lock)
2005 {
2006         int tmp;
2007
2008         /* empty queues and init hardware */
2009         udc_basic_init(dev);
2010         for (tmp = 0; tmp < UDC_EP_NUM; tmp++) {
2011                 empty_req_queue(&dev->ep[tmp]);
2012         }
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         /* init */
2020         udc_setup_endpoints(dev);
2021 }
2022
2023 /* Called by gadget driver to unregister itself */
2024 int usb_gadget_unregister_driver(struct usb_gadget_driver *driver)
2025 {
2026         struct udc      *dev = udc;
2027         unsigned long   flags;
2028         u32 tmp;
2029
2030         if (!dev)
2031                 return -ENODEV;
2032         if (!driver || driver != dev->driver || !driver->unbind)
2033                 return -EINVAL;
2034
2035         spin_lock_irqsave(&dev->lock, flags);
2036         udc_mask_unused_interrupts(dev);
2037         shutdown(dev, driver);
2038         spin_unlock_irqrestore(&dev->lock, flags);
2039
2040         driver->unbind(&dev->gadget);
2041         dev->driver = NULL;
2042
2043         /* set SD */
2044         tmp = readl(&dev->regs->ctl);
2045         tmp |= AMD_BIT(UDC_DEVCTL_SD);
2046         writel(tmp, &dev->regs->ctl);
2047
2048
2049         DBG(dev, "%s: unregistered\n", driver->driver.name);
2050
2051         return 0;
2052 }
2053 EXPORT_SYMBOL(usb_gadget_unregister_driver);
2054
2055
2056 /* Clear pending NAK bits */
2057 static void udc_process_cnak_queue(struct udc *dev)
2058 {
2059         u32 tmp;
2060         u32 reg;
2061
2062         /* check epin's */
2063         DBG(dev, "CNAK pending queue processing\n");
2064         for (tmp = 0; tmp < UDC_EPIN_NUM_USED; tmp++) {
2065                 if (cnak_pending & (1 << tmp)) {
2066                         DBG(dev, "CNAK pending for ep%d\n", tmp);
2067                         /* clear NAK by writing CNAK */
2068                         reg = readl(&dev->ep[tmp].regs->ctl);
2069                         reg |= AMD_BIT(UDC_EPCTL_CNAK);
2070                         writel(reg, &dev->ep[tmp].regs->ctl);
2071                         dev->ep[tmp].naking = 0;
2072                         UDC_QUEUE_CNAK(&dev->ep[tmp], dev->ep[tmp].num);
2073                 }
2074         }
2075         /* ...  and ep0out */
2076         if (cnak_pending & (1 << UDC_EP0OUT_IX)) {
2077                 DBG(dev, "CNAK pending for ep%d\n", UDC_EP0OUT_IX);
2078                 /* clear NAK by writing CNAK */
2079                 reg = readl(&dev->ep[UDC_EP0OUT_IX].regs->ctl);
2080                 reg |= AMD_BIT(UDC_EPCTL_CNAK);
2081                 writel(reg, &dev->ep[UDC_EP0OUT_IX].regs->ctl);
2082                 dev->ep[UDC_EP0OUT_IX].naking = 0;
2083                 UDC_QUEUE_CNAK(&dev->ep[UDC_EP0OUT_IX],
2084                                 dev->ep[UDC_EP0OUT_IX].num);
2085         }
2086 }
2087
2088 /* Enabling RX DMA after setup packet */
2089 static void udc_ep0_set_rde(struct udc *dev)
2090 {
2091         if (use_dma) {
2092                 /*
2093                  * only enable RXDMA when no data endpoint enabled
2094                  * or data is queued
2095                  */
2096                 if (!dev->data_ep_enabled || dev->data_ep_queued) {
2097                         udc_set_rde(dev);
2098                 } else {
2099                         /*
2100                          * setup timer for enabling RDE (to not enable
2101                          * RXFIFO DMA for data endpoints to early)
2102                          */
2103                         if (set_rde != 0 && !timer_pending(&udc_timer)) {
2104                                 udc_timer.expires =
2105                                         jiffies + HZ/UDC_RDE_TIMER_DIV;
2106                                 set_rde = 1;
2107                                 if (!stop_timer) {
2108                                         add_timer(&udc_timer);
2109                                 }
2110                         }
2111                 }
2112         }
2113 }
2114
2115
2116 /* Interrupt handler for data OUT traffic */
2117 static irqreturn_t udc_data_out_isr(struct udc *dev, int ep_ix)
2118 {
2119         irqreturn_t             ret_val = IRQ_NONE;
2120         u32                     tmp;
2121         struct udc_ep           *ep;
2122         struct udc_request      *req;
2123         unsigned int            count;
2124         struct udc_data_dma     *td = NULL;
2125         unsigned                dma_done;
2126
2127         VDBG(dev, "ep%d irq\n", ep_ix);
2128         ep = &dev->ep[ep_ix];
2129
2130         tmp = readl(&ep->regs->sts);
2131         if (use_dma) {
2132                 /* BNA event ? */
2133                 if (tmp & AMD_BIT(UDC_EPSTS_BNA)) {
2134                         DBG(dev, "BNA ep%dout occured - DESPTR = %x \n",
2135                                         ep->num, readl(&ep->regs->desptr));
2136                         /* clear BNA */
2137                         writel(tmp | AMD_BIT(UDC_EPSTS_BNA), &ep->regs->sts);
2138                         if (!ep->cancel_transfer)
2139                                 ep->bna_occurred = 1;
2140                         else
2141                                 ep->cancel_transfer = 0;
2142                         ret_val = IRQ_HANDLED;
2143                         goto finished;
2144                 }
2145         }
2146         /* HE event ? */
2147         if (tmp & AMD_BIT(UDC_EPSTS_HE)) {
2148                 dev_err(&dev->pdev->dev, "HE ep%dout occured\n", ep->num);
2149
2150                 /* clear HE */
2151                 writel(tmp | AMD_BIT(UDC_EPSTS_HE), &ep->regs->sts);
2152                 ret_val = IRQ_HANDLED;
2153                 goto finished;
2154         }
2155
2156         if (!list_empty(&ep->queue)) {
2157
2158                 /* next request */
2159                 req = list_entry(ep->queue.next,
2160                         struct udc_request, queue);
2161         } else {
2162                 req = NULL;
2163                 udc_rxfifo_pending = 1;
2164         }
2165         VDBG(dev, "req = %p\n", req);
2166         /* fifo mode */
2167         if (!use_dma) {
2168
2169                 /* read fifo */
2170                 if (req && udc_rxfifo_read(ep, req)) {
2171                         ret_val = IRQ_HANDLED;
2172
2173                         /* finish */
2174                         complete_req(ep, req, 0);
2175                         /* next request */
2176                         if (!list_empty(&ep->queue) && !ep->halted) {
2177                                 req = list_entry(ep->queue.next,
2178                                         struct udc_request, queue);
2179                         } else
2180                                 req = NULL;
2181                 }
2182
2183         /* DMA */
2184         } else if (!ep->cancel_transfer && req != NULL) {
2185                 ret_val = IRQ_HANDLED;
2186
2187                 /* check for DMA done */
2188                 if (!use_dma_ppb) {
2189                         dma_done = AMD_GETBITS(req->td_data->status,
2190                                                 UDC_DMA_OUT_STS_BS);
2191                 /* packet per buffer mode - rx bytes */
2192                 } else {
2193                         /*
2194                          * if BNA occurred then recover desc. from
2195                          * BNA dummy desc.
2196                          */
2197                         if (ep->bna_occurred) {
2198                                 VDBG(dev, "Recover desc. from BNA dummy\n");
2199                                 memcpy(req->td_data, ep->bna_dummy_req->td_data,
2200                                                 sizeof(struct udc_data_dma));
2201                                 ep->bna_occurred = 0;
2202                                 udc_init_bna_dummy(ep->req);
2203                         }
2204                         td = udc_get_last_dma_desc(req);
2205                         dma_done = AMD_GETBITS(td->status, UDC_DMA_OUT_STS_BS);
2206                 }
2207                 if (dma_done == UDC_DMA_OUT_STS_BS_DMA_DONE) {
2208                         /* buffer fill mode - rx bytes */
2209                         if (!use_dma_ppb) {
2210                                 /* received number bytes */
2211                                 count = AMD_GETBITS(req->td_data->status,
2212                                                 UDC_DMA_OUT_STS_RXBYTES);
2213                                 VDBG(dev, "rx bytes=%u\n", count);
2214                         /* packet per buffer mode - rx bytes */
2215                         } else {
2216                                 VDBG(dev, "req->td_data=%p\n", req->td_data);
2217                                 VDBG(dev, "last desc = %p\n", td);
2218                                 /* received number bytes */
2219                                 if (use_dma_ppb_du) {
2220                                         /* every desc. counts bytes */
2221                                         count = udc_get_ppbdu_rxbytes(req);
2222                                 } else {
2223                                         /* last desc. counts bytes */
2224                                         count = AMD_GETBITS(td->status,
2225                                                 UDC_DMA_OUT_STS_RXBYTES);
2226                                         if (!count && req->req.length
2227                                                 == UDC_DMA_MAXPACKET) {
2228                                                 /*
2229                                                  * on 64k packets the RXBYTES
2230                                                  * field is zero
2231                                                  */
2232                                                 count = UDC_DMA_MAXPACKET;
2233                                         }
2234                                 }
2235                                 VDBG(dev, "last desc rx bytes=%u\n", count);
2236                         }
2237
2238                         tmp = req->req.length - req->req.actual;
2239                         if (count > tmp) {
2240                                 if ((tmp % ep->ep.maxpacket) != 0) {
2241                                         DBG(dev, "%s: rx %db, space=%db\n",
2242                                                 ep->ep.name, count, tmp);
2243                                         req->req.status = -EOVERFLOW;
2244                                 }
2245                                 count = tmp;
2246                         }
2247                         req->req.actual += count;
2248                         req->dma_going = 0;
2249                         /* complete request */
2250                         complete_req(ep, req, 0);
2251
2252                         /* next request */
2253                         if (!list_empty(&ep->queue) && !ep->halted) {
2254                                 req = list_entry(ep->queue.next,
2255                                         struct udc_request,
2256                                         queue);
2257                                 /*
2258                                  * DMA may be already started by udc_queue()
2259                                  * called by gadget drivers completion
2260                                  * routine. This happens when queue
2261                                  * holds one request only.
2262                                  */
2263                                 if (req->dma_going == 0) {
2264                                         /* next dma */
2265                                         if (prep_dma(ep, req, GFP_ATOMIC) != 0)
2266                                                 goto finished;
2267                                         /* write desc pointer */
2268                                         writel(req->td_phys,
2269                                                 &ep->regs->desptr);
2270                                         req->dma_going = 1;
2271                                         /* enable DMA */
2272                                         udc_set_rde(dev);
2273                                 }
2274                         } else {
2275                                 /*
2276                                  * implant BNA dummy descriptor to allow
2277                                  * RXFIFO opening by RDE
2278                                  */
2279                                 if (ep->bna_dummy_req) {
2280                                         /* write desc pointer */
2281                                         writel(ep->bna_dummy_req->td_phys,
2282                                                 &ep->regs->desptr);
2283                                         ep->bna_occurred = 0;
2284                                 }
2285
2286                                 /*
2287                                  * schedule timer for setting RDE if queue
2288                                  * remains empty to allow ep0 packets pass
2289                                  * through
2290                                  */
2291                                 if (set_rde != 0
2292                                                 && !timer_pending(&udc_timer)) {
2293                                         udc_timer.expires =
2294                                                 jiffies
2295                                                 + HZ*UDC_RDE_TIMER_SECONDS;
2296                                         set_rde = 1;
2297                                         if (!stop_timer) {
2298                                                 add_timer(&udc_timer);
2299                                         }
2300                                 }
2301                                 if (ep->num != UDC_EP0OUT_IX)
2302                                         dev->data_ep_queued = 0;
2303                         }
2304
2305                 } else {
2306                         /*
2307                         * RX DMA must be reenabled for each desc in PPBDU mode
2308                         * and must be enabled for PPBNDU mode in case of BNA
2309                         */
2310                         udc_set_rde(dev);
2311                 }
2312
2313         } else if (ep->cancel_transfer) {
2314                 ret_val = IRQ_HANDLED;
2315                 ep->cancel_transfer = 0;
2316         }
2317
2318         /* check pending CNAKS */
2319         if (cnak_pending) {
2320                 /* CNAk processing when rxfifo empty only */
2321                 if (readl(&dev->regs->sts) & AMD_BIT(UDC_DEVSTS_RXFIFO_EMPTY)) {
2322                         udc_process_cnak_queue(dev);
2323                 }
2324         }
2325
2326         /* clear OUT bits in ep status */
2327         writel(UDC_EPSTS_OUT_CLEAR, &ep->regs->sts);
2328 finished:
2329         return ret_val;
2330 }
2331
2332 /* Interrupt handler for data IN traffic */
2333 static irqreturn_t udc_data_in_isr(struct udc *dev, int ep_ix)
2334 {
2335         irqreturn_t ret_val = IRQ_NONE;
2336         u32 tmp;
2337         u32 epsts;
2338         struct udc_ep *ep;
2339         struct udc_request *req;
2340         struct udc_data_dma *td;
2341         unsigned dma_done;
2342         unsigned len;
2343
2344         ep = &dev->ep[ep_ix];
2345
2346         epsts = readl(&ep->regs->sts);
2347         if (use_dma) {
2348                 /* BNA ? */
2349                 if (epsts & AMD_BIT(UDC_EPSTS_BNA)) {
2350                         dev_err(&dev->pdev->dev,
2351                                 "BNA ep%din occured - DESPTR = %08lx \n",
2352                                 ep->num,
2353                                 (unsigned long) readl(&ep->regs->desptr));
2354
2355                         /* clear BNA */
2356                         writel(epsts, &ep->regs->sts);
2357                         ret_val = IRQ_HANDLED;
2358                         goto finished;
2359                 }
2360         }
2361         /* HE event ? */
2362         if (epsts & AMD_BIT(UDC_EPSTS_HE)) {
2363                 dev_err(&dev->pdev->dev,
2364                         "HE ep%dn occured - DESPTR = %08lx \n",
2365                         ep->num, (unsigned long) readl(&ep->regs->desptr));
2366
2367                 /* clear HE */
2368                 writel(epsts | AMD_BIT(UDC_EPSTS_HE), &ep->regs->sts);
2369                 ret_val = IRQ_HANDLED;
2370                 goto finished;
2371         }
2372
2373         /* DMA completion */
2374         if (epsts & AMD_BIT(UDC_EPSTS_TDC)) {
2375                 VDBG(dev, "TDC set- completion\n");
2376                 ret_val = IRQ_HANDLED;
2377                 if (!ep->cancel_transfer && !list_empty(&ep->queue)) {
2378                         req = list_entry(ep->queue.next,
2379                                         struct udc_request, queue);
2380                         if (req) {
2381                                 /*
2382                                  * length bytes transfered
2383                                  * check dma done of last desc. in PPBDU mode
2384                                  */
2385                                 if (use_dma_ppb_du) {
2386                                         td = udc_get_last_dma_desc(req);
2387                                         if (td) {
2388                                                 dma_done =
2389                                                         AMD_GETBITS(td->status,
2390                                                         UDC_DMA_IN_STS_BS);
2391                                                 /* don't care DMA done */
2392                                                 req->req.actual =
2393                                                         req->req.length;
2394                                         }
2395                                 } else {
2396                                         /* assume all bytes transferred */
2397                                         req->req.actual = req->req.length;
2398                                 }
2399
2400                                 if (req->req.actual == req->req.length) {
2401                                         /* complete req */
2402                                         complete_req(ep, req, 0);
2403                                         req->dma_going = 0;
2404                                         /* further request available ? */
2405                                         if (list_empty(&ep->queue)) {
2406                                                 /* disable interrupt */
2407                                                 tmp = readl(
2408                                                         &dev->regs->ep_irqmsk);
2409                                                 tmp |= AMD_BIT(ep->num);
2410                                                 writel(tmp,
2411                                                         &dev->regs->ep_irqmsk);
2412                                         }
2413
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                 }
2481         }
2482         /* clear status bits */
2483         writel(epsts, &ep->regs->sts);
2484
2485 finished:
2486         return ret_val;
2487
2488 }
2489
2490 /* Interrupt handler for Control OUT traffic */
2491 static irqreturn_t udc_control_out_isr(struct udc *dev)
2492 __releases(dev->lock)
2493 __acquires(dev->lock)
2494 {
2495         irqreturn_t ret_val = IRQ_NONE;
2496         u32 tmp;
2497         int setup_supported;
2498         u32 count;
2499         int set = 0;
2500         struct udc_ep   *ep;
2501         struct udc_ep   *ep_tmp;
2502
2503         ep = &dev->ep[UDC_EP0OUT_IX];
2504
2505         /* clear irq */
2506         writel(AMD_BIT(UDC_EPINT_OUT_EP0), &dev->regs->ep_irqsts);
2507
2508         tmp = readl(&dev->ep[UDC_EP0OUT_IX].regs->sts);
2509         /* check BNA and clear if set */
2510         if (tmp & AMD_BIT(UDC_EPSTS_BNA)) {
2511                 VDBG(dev, "ep0: BNA set\n");
2512                 writel(AMD_BIT(UDC_EPSTS_BNA),
2513                         &dev->ep[UDC_EP0OUT_IX].regs->sts);
2514                 ep->bna_occurred = 1;
2515                 ret_val = IRQ_HANDLED;
2516                 goto finished;
2517         }
2518
2519         /* type of data: SETUP or DATA 0 bytes */
2520         tmp = AMD_GETBITS(tmp, UDC_EPSTS_OUT);
2521         VDBG(dev, "data_typ = %x\n", tmp);
2522
2523         /* setup data */
2524         if (tmp == UDC_EPSTS_OUT_SETUP) {
2525                 ret_val = IRQ_HANDLED;
2526
2527                 ep->dev->stall_ep0in = 0;
2528                 dev->waiting_zlp_ack_ep0in = 0;
2529
2530                 /* set NAK for EP0_IN */
2531                 tmp = readl(&dev->ep[UDC_EP0IN_IX].regs->ctl);
2532                 tmp |= AMD_BIT(UDC_EPCTL_SNAK);
2533                 writel(tmp, &dev->ep[UDC_EP0IN_IX].regs->ctl);
2534                 dev->ep[UDC_EP0IN_IX].naking = 1;
2535                 /* get setup data */
2536                 if (use_dma) {
2537
2538                         /* clear OUT bits in ep status */
2539                         writel(UDC_EPSTS_OUT_CLEAR,
2540                                 &dev->ep[UDC_EP0OUT_IX].regs->sts);
2541
2542                         setup_data.data[0] =
2543                                 dev->ep[UDC_EP0OUT_IX].td_stp->data12;
2544                         setup_data.data[1] =
2545                                 dev->ep[UDC_EP0OUT_IX].td_stp->data34;
2546                         /* set HOST READY */
2547                         dev->ep[UDC_EP0OUT_IX].td_stp->status =
2548                                         UDC_DMA_STP_STS_BS_HOST_READY;
2549                 } else {
2550                         /* read fifo */
2551                         udc_rxfifo_read_dwords(dev, setup_data.data, 2);
2552                 }
2553
2554                 /* determine direction of control data */
2555                 if ((setup_data.request.bRequestType & USB_DIR_IN) != 0) {
2556                         dev->gadget.ep0 = &dev->ep[UDC_EP0IN_IX].ep;
2557                         /* enable RDE */
2558                         udc_ep0_set_rde(dev);
2559                         set = 0;
2560                 } else {
2561                         dev->gadget.ep0 = &dev->ep[UDC_EP0OUT_IX].ep;
2562                         /*
2563                          * implant BNA dummy descriptor to allow RXFIFO opening
2564                          * by RDE
2565                          */
2566                         if (ep->bna_dummy_req) {
2567                                 /* write desc pointer */
2568                                 writel(ep->bna_dummy_req->td_phys,
2569                                         &dev->ep[UDC_EP0OUT_IX].regs->desptr);
2570                                 ep->bna_occurred = 0;
2571                         }
2572
2573                         set = 1;
2574                         dev->ep[UDC_EP0OUT_IX].naking = 1;
2575                         /*
2576                          * setup timer for enabling RDE (to not enable
2577                          * RXFIFO DMA for data to early)
2578                          */
2579                         set_rde = 1;
2580                         if (!timer_pending(&udc_timer)) {
2581                                 udc_timer.expires = jiffies +
2582                                                         HZ/UDC_RDE_TIMER_DIV;
2583                                 if (!stop_timer) {
2584                                         add_timer(&udc_timer);
2585                                 }
2586                         }
2587                 }
2588
2589                 /*
2590                  * mass storage reset must be processed here because
2591                  * next packet may be a CLEAR_FEATURE HALT which would not
2592                  * clear the stall bit when no STALL handshake was received
2593                  * before (autostall can cause this)
2594                  */
2595                 if (setup_data.data[0] == UDC_MSCRES_DWORD0
2596                                 && setup_data.data[1] == UDC_MSCRES_DWORD1) {
2597                         DBG(dev, "MSC Reset\n");
2598                         /*
2599                          * clear stall bits
2600                          * only one IN and OUT endpoints are handled
2601                          */
2602                         ep_tmp = &udc->ep[UDC_EPIN_IX];
2603                         udc_set_halt(&ep_tmp->ep, 0);
2604                         ep_tmp = &udc->ep[UDC_EPOUT_IX];
2605                         udc_set_halt(&ep_tmp->ep, 0);
2606                 }
2607
2608                 /* call gadget with setup data received */
2609                 spin_unlock(&dev->lock);
2610                 setup_supported = dev->driver->setup(&dev->gadget,
2611                                                 &setup_data.request);
2612                 spin_lock(&dev->lock);
2613
2614                 tmp = readl(&dev->ep[UDC_EP0IN_IX].regs->ctl);
2615                 /* ep0 in returns data (not zlp) on IN phase */
2616                 if (setup_supported >= 0 && setup_supported <
2617                                 UDC_EP0IN_MAXPACKET) {
2618                         /* clear NAK by writing CNAK in EP0_IN */
2619                         tmp |= AMD_BIT(UDC_EPCTL_CNAK);
2620                         writel(tmp, &dev->ep[UDC_EP0IN_IX].regs->ctl);
2621                         dev->ep[UDC_EP0IN_IX].naking = 0;
2622                         UDC_QUEUE_CNAK(&dev->ep[UDC_EP0IN_IX], UDC_EP0IN_IX);
2623
2624                 /* if unsupported request then stall */
2625                 } else if (setup_supported < 0) {
2626                         tmp |= AMD_BIT(UDC_EPCTL_S);
2627                         writel(tmp, &dev->ep[UDC_EP0IN_IX].regs->ctl);
2628                 } else
2629                         dev->waiting_zlp_ack_ep0in = 1;
2630
2631
2632                 /* clear NAK by writing CNAK in EP0_OUT */
2633                 if (!set) {
2634                         tmp = readl(&dev->ep[UDC_EP0OUT_IX].regs->ctl);
2635                         tmp |= AMD_BIT(UDC_EPCTL_CNAK);
2636                         writel(tmp, &dev->ep[UDC_EP0OUT_IX].regs->ctl);
2637                         dev->ep[UDC_EP0OUT_IX].naking = 0;
2638                         UDC_QUEUE_CNAK(&dev->ep[UDC_EP0OUT_IX], UDC_EP0OUT_IX);
2639                 }
2640
2641                 if (!use_dma) {
2642                         /* clear OUT bits in ep status */
2643                         writel(UDC_EPSTS_OUT_CLEAR,
2644                                 &dev->ep[UDC_EP0OUT_IX].regs->sts);
2645                 }
2646
2647         /* data packet 0 bytes */
2648         } else if (tmp == UDC_EPSTS_OUT_DATA) {
2649                 /* clear OUT bits in ep status */
2650                 writel(UDC_EPSTS_OUT_CLEAR, &dev->ep[UDC_EP0OUT_IX].regs->sts);
2651
2652                 /* get setup data: only 0 packet */
2653                 if (use_dma) {
2654                         /* no req if 0 packet, just reactivate */
2655                         if (list_empty(&dev->ep[UDC_EP0OUT_IX].queue)) {
2656                                 VDBG(dev, "ZLP\n");
2657
2658                                 /* set HOST READY */
2659                                 dev->ep[UDC_EP0OUT_IX].td->status =
2660                                         AMD_ADDBITS(
2661                                         dev->ep[UDC_EP0OUT_IX].td->status,
2662                                         UDC_DMA_OUT_STS_BS_HOST_READY,
2663                                         UDC_DMA_OUT_STS_BS);
2664                                 /* enable RDE */
2665                                 udc_ep0_set_rde(dev);
2666                                 ret_val = IRQ_HANDLED;
2667
2668                         } else {
2669                                 /* control write */
2670                                 ret_val |= udc_data_out_isr(dev, UDC_EP0OUT_IX);
2671                                 /* re-program desc. pointer for possible ZLPs */
2672                                 writel(dev->ep[UDC_EP0OUT_IX].td_phys,
2673                                         &dev->ep[UDC_EP0OUT_IX].regs->desptr);
2674                                 /* enable RDE */
2675                                 udc_ep0_set_rde(dev);
2676                         }
2677                 } else {
2678
2679                         /* received number bytes */
2680                         count = readl(&dev->ep[UDC_EP0OUT_IX].regs->sts);
2681                         count = AMD_GETBITS(count, UDC_EPSTS_RX_PKT_SIZE);
2682                         /* out data for fifo mode not working */
2683                         count = 0;
2684
2685                         /* 0 packet or real data ? */
2686                         if (count != 0) {
2687                                 ret_val |= udc_data_out_isr(dev, UDC_EP0OUT_IX);
2688                         } else {
2689                                 /* dummy read confirm */
2690                                 readl(&dev->ep[UDC_EP0OUT_IX].regs->confirm);
2691                                 ret_val = IRQ_HANDLED;
2692                         }
2693                 }
2694         }
2695
2696         /* check pending CNAKS */
2697         if (cnak_pending) {
2698                 /* CNAk processing when rxfifo empty only */
2699                 if (readl(&dev->regs->sts) & AMD_BIT(UDC_DEVSTS_RXFIFO_EMPTY)) {
2700                         udc_process_cnak_queue(dev);
2701                 }
2702         }
2703
2704 finished:
2705         return ret_val;
2706 }
2707
2708 /* Interrupt handler for Control IN traffic */
2709 static irqreturn_t udc_control_in_isr(struct udc *dev)
2710 {
2711         irqreturn_t ret_val = IRQ_NONE;
2712         u32 tmp;
2713         struct udc_ep *ep;
2714         struct udc_request *req;
2715         unsigned len;
2716
2717         ep = &dev->ep[UDC_EP0IN_IX];
2718
2719         /* clear irq */
2720         writel(AMD_BIT(UDC_EPINT_IN_EP0), &dev->regs->ep_irqsts);
2721
2722         tmp = readl(&dev->ep[UDC_EP0IN_IX].regs->sts);
2723         /* DMA completion */
2724         if (tmp & AMD_BIT(UDC_EPSTS_TDC)) {
2725                 VDBG(dev, "isr: TDC clear \n");
2726                 ret_val = IRQ_HANDLED;
2727
2728                 /* clear TDC bit */
2729                 writel(AMD_BIT(UDC_EPSTS_TDC),
2730                                 &dev->ep[UDC_EP0IN_IX].regs->sts);
2731
2732         /* status reg has IN bit set ? */
2733         } else if (tmp & AMD_BIT(UDC_EPSTS_IN)) {
2734                 ret_val = IRQ_HANDLED;
2735
2736                 if (ep->dma) {
2737                         /* clear IN bit */
2738                         writel(AMD_BIT(UDC_EPSTS_IN),
2739                                 &dev->ep[UDC_EP0IN_IX].regs->sts);
2740                 }
2741                 if (dev->stall_ep0in) {
2742                         DBG(dev, "stall ep0in\n");
2743                         /* halt ep0in */
2744                         tmp = readl(&ep->regs->ctl);
2745                         tmp |= AMD_BIT(UDC_EPCTL_S);
2746                         writel(tmp, &ep->regs->ctl);
2747                 } else {
2748                         if (!list_empty(&ep->queue)) {
2749                                 /* next request */
2750                                 req = list_entry(ep->queue.next,
2751                                                 struct udc_request, queue);
2752
2753                                 if (ep->dma) {
2754                                         /* write desc pointer */
2755                                         writel(req->td_phys, &ep->regs->desptr);
2756                                         /* set HOST READY */
2757                                         req->td_data->status =
2758                                                 AMD_ADDBITS(
2759                                                 req->td_data->status,
2760                                                 UDC_DMA_STP_STS_BS_HOST_READY,
2761                                                 UDC_DMA_STP_STS_BS);
2762
2763                                         /* set poll demand bit */
2764                                         tmp =
2765                                         readl(&dev->ep[UDC_EP0IN_IX].regs->ctl);
2766                                         tmp |= AMD_BIT(UDC_EPCTL_P);
2767                                         writel(tmp,
2768                                         &dev->ep[UDC_EP0IN_IX].regs->ctl);
2769
2770                                         /* all bytes will be transferred */
2771                                         req->req.actual = req->req.length;
2772
2773                                         /* complete req */
2774                                         complete_req(ep, req, 0);
2775
2776                                 } else {
2777                                         /* write fifo */
2778                                         udc_txfifo_write(ep, &req->req);
2779
2780                                         /* lengh bytes transfered */
2781                                         len = req->req.length - req->req.actual;
2782                                         if (len > ep->ep.maxpacket)
2783                                                 len = ep->ep.maxpacket;
2784
2785                                         req->req.actual += len;
2786                                         if (req->req.actual == req->req.length
2787                                                 || (len != ep->ep.maxpacket)) {
2788                                                 /* complete req */
2789                                                 complete_req(ep, req, 0);
2790                                         }
2791                                 }
2792
2793                         }
2794                 }
2795                 ep->halted = 0;
2796                 dev->stall_ep0in = 0;
2797                 if (!ep->dma) {
2798                         /* clear IN bit */
2799                         writel(AMD_BIT(UDC_EPSTS_IN),
2800                                 &dev->ep[UDC_EP0IN_IX].regs->sts);
2801                 }
2802         }
2803
2804         return ret_val;
2805 }
2806
2807
2808 /* Interrupt handler for global device events */
2809 static irqreturn_t udc_dev_isr(struct udc *dev, u32 dev_irq)
2810 __releases(dev->lock)
2811 __acquires(dev->lock)
2812 {
2813         irqreturn_t ret_val = IRQ_NONE;
2814         u32 tmp;
2815         u32 cfg;
2816         struct udc_ep *ep;
2817         u16 i;
2818         u8 udc_csr_epix;
2819
2820         /* SET_CONFIG irq ? */
2821         if (dev_irq & AMD_BIT(UDC_DEVINT_SC)) {
2822                 ret_val = IRQ_HANDLED;
2823
2824                 /* read config value */
2825                 tmp = readl(&dev->regs->sts);
2826                 cfg = AMD_GETBITS(tmp, UDC_DEVSTS_CFG);
2827                 DBG(dev, "SET_CONFIG interrupt: config=%d\n", cfg);
2828                 dev->cur_config = cfg;
2829                 dev->set_cfg_not_acked = 1;
2830
2831                 /* make usb request for gadget driver */
2832                 memset(&setup_data, 0 , sizeof(union udc_setup_data));
2833                 setup_data.request.bRequest = USB_REQ_SET_CONFIGURATION;
2834                 setup_data.request.wValue = dev->cur_config;
2835
2836                 /* programm the NE registers */
2837                 for (i = 0; i < UDC_EP_NUM; i++) {
2838                         ep = &dev->ep[i];
2839                         if (ep->in) {
2840
2841                                 /* ep ix in UDC CSR register space */
2842                                 udc_csr_epix = ep->num;
2843
2844
2845                         /* OUT ep */
2846                         } else {
2847                                 /* ep ix in UDC CSR register space */
2848                                 udc_csr_epix = ep->num - UDC_CSR_EP_OUT_IX_OFS;
2849                         }
2850
2851                         tmp = readl(&dev->csr->ne[udc_csr_epix]);
2852                         /* ep cfg */
2853                         tmp = AMD_ADDBITS(tmp, ep->dev->cur_config,
2854                                                 UDC_CSR_NE_CFG);
2855                         /* write reg */
2856                         writel(tmp, &dev->csr->ne[udc_csr_epix]);
2857
2858                         /* clear stall bits */
2859                         ep->halted = 0;
2860                         tmp = readl(&ep->regs->ctl);
2861                         tmp = tmp & AMD_CLEAR_BIT(UDC_EPCTL_S);
2862                         writel(tmp, &ep->regs->ctl);
2863                 }
2864                 /* call gadget zero with setup data received */
2865                 spin_unlock(&dev->lock);
2866                 tmp = dev->driver->setup(&dev->gadget, &setup_data.request);
2867                 spin_lock(&dev->lock);
2868
2869         } /* SET_INTERFACE ? */
2870         if (dev_irq & AMD_BIT(UDC_DEVINT_SI)) {
2871                 ret_val = IRQ_HANDLED;
2872
2873                 dev->set_cfg_not_acked = 1;
2874                 /* read interface and alt setting values */
2875                 tmp = readl(&dev->regs->sts);
2876                 dev->cur_alt = AMD_GETBITS(tmp, UDC_DEVSTS_ALT);
2877                 dev->cur_intf = AMD_GETBITS(tmp, UDC_DEVSTS_INTF);
2878
2879                 /* make usb request for gadget driver */
2880                 memset(&setup_data, 0 , sizeof(union udc_setup_data));
2881                 setup_data.request.bRequest = USB_REQ_SET_INTERFACE;
2882                 setup_data.request.bRequestType = USB_RECIP_INTERFACE;
2883                 setup_data.request.wValue = dev->cur_alt;
2884                 setup_data.request.wIndex = dev->cur_intf;
2885
2886                 DBG(dev, "SET_INTERFACE interrupt: alt=%d intf=%d\n",
2887                                 dev->cur_alt, dev->cur_intf);
2888
2889                 /* programm the NE registers */
2890                 for (i = 0; i < UDC_EP_NUM; i++) {
2891                         ep = &dev->ep[i];
2892                         if (ep->in) {
2893
2894                                 /* ep ix in UDC CSR register space */
2895                                 udc_csr_epix = ep->num;
2896
2897
2898                         /* OUT ep */
2899                         } else {
2900                                 /* ep ix in UDC CSR register space */
2901                                 udc_csr_epix = ep->num - UDC_CSR_EP_OUT_IX_OFS;
2902                         }
2903
2904                         /* UDC CSR reg */
2905                         /* set ep values */
2906                         tmp = readl(&dev->csr->ne[udc_csr_epix]);
2907                         /* ep interface */
2908                         tmp = AMD_ADDBITS(tmp, ep->dev->cur_intf,
2909                                                 UDC_CSR_NE_INTF);
2910                         /* tmp = AMD_ADDBITS(tmp, 2, UDC_CSR_NE_INTF); */
2911                         /* ep alt */
2912                         tmp = AMD_ADDBITS(tmp, ep->dev->cur_alt,
2913                                                 UDC_CSR_NE_ALT);
2914                         /* write reg */
2915                         writel(tmp, &dev->csr->ne[udc_csr_epix]);
2916
2917                         /* clear stall bits */
2918                         ep->halted = 0;
2919                         tmp = readl(&ep->regs->ctl);
2920                         tmp = tmp & AMD_CLEAR_BIT(UDC_EPCTL_S);
2921                         writel(tmp, &ep->regs->ctl);
2922                 }
2923
2924                 /* call gadget zero with setup data received */
2925                 spin_unlock(&dev->lock);
2926                 tmp = dev->driver->setup(&dev->gadget, &setup_data.request);
2927                 spin_lock(&dev->lock);
2928
2929         } /* USB reset */
2930         if (dev_irq & AMD_BIT(UDC_DEVINT_UR)) {
2931                 DBG(dev, "USB Reset interrupt\n");
2932                 ret_val = IRQ_HANDLED;
2933
2934                 /* allow soft reset when suspend occurs */
2935                 soft_reset_occured = 0;
2936
2937                 dev->waiting_zlp_ack_ep0in = 0;
2938                 dev->set_cfg_not_acked = 0;
2939
2940                 /* mask not needed interrupts */
2941                 udc_mask_unused_interrupts(dev);
2942
2943                 /* call gadget to resume and reset configs etc. */
2944                 spin_unlock(&dev->lock);
2945                 if (dev->sys_suspended && dev->driver->resume) {
2946                         dev->driver->resume(&dev->gadget);
2947                         dev->sys_suspended = 0;
2948                 }
2949                 dev->driver->disconnect(&dev->gadget);
2950                 spin_lock(&dev->lock);
2951
2952                 /* disable ep0 to empty req queue */
2953                 empty_req_queue(&dev->ep[UDC_EP0IN_IX]);
2954                 ep_init(dev->regs, &dev->ep[UDC_EP0IN_IX]);
2955
2956                 /* soft reset when rxfifo not empty */
2957                 tmp = readl(&dev->regs->sts);
2958                 if (!(tmp & AMD_BIT(UDC_DEVSTS_RXFIFO_EMPTY))
2959                                 && !soft_reset_after_usbreset_occured) {
2960                         udc_soft_reset(dev);
2961                         soft_reset_after_usbreset_occured++;
2962                 }
2963
2964                 /*
2965                  * DMA reset to kill potential old DMA hw hang,
2966                  * POLL bit is already reset by ep_init() through
2967                  * disconnect()
2968                  */
2969                 DBG(dev, "DMA machine reset\n");
2970                 tmp = readl(&dev->regs->cfg);
2971                 writel(tmp | AMD_BIT(UDC_DEVCFG_DMARST), &dev->regs->cfg);
2972                 writel(tmp, &dev->regs->cfg);
2973
2974                 /* put into initial config */
2975                 udc_basic_init(dev);
2976
2977                 /* enable device setup interrupts */
2978                 udc_enable_dev_setup_interrupts(dev);
2979
2980                 /* enable suspend interrupt */
2981                 tmp = readl(&dev->regs->irqmsk);
2982                 tmp &= AMD_UNMASK_BIT(UDC_DEVINT_US);
2983                 writel(tmp, &dev->regs->irqmsk);
2984
2985         } /* USB suspend */
2986         if (dev_irq & AMD_BIT(UDC_DEVINT_US)) {
2987                 DBG(dev, "USB Suspend interrupt\n");
2988                 ret_val = IRQ_HANDLED;
2989                 if (dev->driver->suspend) {
2990                         spin_unlock(&dev->lock);
2991                         dev->sys_suspended = 1;
2992                         dev->driver->suspend(&dev->gadget);
2993                         spin_lock(&dev->lock);
2994                 }
2995         } /* new speed ? */
2996         if (dev_irq & AMD_BIT(UDC_DEVINT_ENUM)) {
2997                 DBG(dev, "ENUM interrupt\n");
2998                 ret_val = IRQ_HANDLED;
2999                 soft_reset_after_usbreset_occured = 0;
3000
3001                 /* disable ep0 to empty req queue */
3002                 empty_req_queue(&dev->ep[UDC_EP0IN_IX]);
3003                 ep_init(dev->regs, &dev->ep[UDC_EP0IN_IX]);
3004
3005                 /* link up all endpoints */
3006                 udc_setup_endpoints(dev);
3007                 if (dev->gadget.speed == USB_SPEED_HIGH) {
3008                         dev_info(&dev->pdev->dev, "Connect: speed = %s\n",
3009                                 "high");
3010                 } else if (dev->gadget.speed == USB_SPEED_FULL) {
3011                         dev_info(&dev->pdev->dev, "Connect: speed = %s\n",
3012                                 "full");
3013                 }
3014
3015                 /* init ep 0 */
3016                 activate_control_endpoints(dev);
3017
3018                 /* enable ep0 interrupts */
3019                 udc_enable_ep0_interrupts(dev);
3020         }
3021         /* session valid change interrupt */
3022         if (dev_irq & AMD_BIT(UDC_DEVINT_SVC)) {
3023                 DBG(dev, "USB SVC interrupt\n");
3024                 ret_val = IRQ_HANDLED;
3025
3026                 /* check that session is not valid to detect disconnect */
3027                 tmp = readl(&dev->regs->sts);
3028                 if (!(tmp & AMD_BIT(UDC_DEVSTS_SESSVLD))) {
3029                         /* disable suspend interrupt */
3030                         tmp = readl(&dev->regs->irqmsk);
3031                         tmp |= AMD_BIT(UDC_DEVINT_US);
3032                         writel(tmp, &dev->regs->irqmsk);
3033                         DBG(dev, "USB Disconnect (session valid low)\n");
3034                         /* cleanup on disconnect */
3035                         usb_disconnect(udc);
3036                 }
3037
3038         }
3039
3040         return ret_val;
3041 }
3042
3043 /* Interrupt Service Routine, see Linux Kernel Doc for parameters */
3044 static irqreturn_t udc_irq(int irq, void *pdev)
3045 {
3046         struct udc *dev = pdev;
3047         u32 reg;
3048         u16 i;
3049         u32 ep_irq;
3050         irqreturn_t ret_val = IRQ_NONE;
3051
3052         spin_lock(&dev->lock);
3053
3054         /* check for ep irq */
3055         reg = readl(&dev->regs->ep_irqsts);
3056         if (reg) {
3057                 if (reg & AMD_BIT(UDC_EPINT_OUT_EP0))
3058                         ret_val |= udc_control_out_isr(dev);
3059                 if (reg & AMD_BIT(UDC_EPINT_IN_EP0))
3060                         ret_val |= udc_control_in_isr(dev);
3061
3062                 /*
3063                  * data endpoint
3064                  * iterate ep's
3065                  */
3066                 for (i = 1; i < UDC_EP_NUM; i++) {
3067                         ep_irq = 1 << i;
3068                         if (!(reg & ep_irq) || i == UDC_EPINT_OUT_EP0)
3069                                 continue;
3070
3071                         /* clear irq status */
3072                         writel(ep_irq, &dev->regs->ep_irqsts);
3073
3074                         /* irq for out ep ? */
3075                         if (i > UDC_EPIN_NUM)
3076                                 ret_val |= udc_data_out_isr(dev, i);
3077                         else
3078                                 ret_val |= udc_data_in_isr(dev, i);
3079                 }
3080
3081         }
3082
3083
3084         /* check for dev irq */
3085         reg = readl(&dev->regs->irqsts);
3086         if (reg) {
3087                 /* clear irq */
3088                 writel(reg, &dev->regs->irqsts);
3089                 ret_val |= udc_dev_isr(dev, reg);
3090         }
3091
3092
3093         spin_unlock(&dev->lock);
3094         return ret_val;
3095 }
3096
3097 /* Tears down device */
3098 static void gadget_release(struct device *pdev)
3099 {
3100         struct amd5536udc *dev = dev_get_drvdata(pdev);
3101         kfree(dev);
3102 }
3103
3104 /* Cleanup on device remove */
3105 static void udc_remove(struct udc *dev)
3106 {
3107         /* remove timer */
3108         stop_timer++;
3109         if (timer_pending(&udc_timer))
3110                 wait_for_completion(&on_exit);
3111         if (udc_timer.data)
3112                 del_timer_sync(&udc_timer);
3113         /* remove pollstall timer */
3114         stop_pollstall_timer++;
3115         if (timer_pending(&udc_pollstall_timer))
3116                 wait_for_completion(&on_pollstall_exit);
3117         if (udc_pollstall_timer.data)
3118                 del_timer_sync(&udc_pollstall_timer);
3119         udc = NULL;
3120 }
3121
3122 /* Reset all pci context */
3123 static void udc_pci_remove(struct pci_dev *pdev)
3124 {
3125         struct udc              *dev;
3126
3127         dev = pci_get_drvdata(pdev);
3128
3129         /* gadget driver must not be registered */
3130         BUG_ON(dev->driver != NULL);
3131
3132         /* dma pool cleanup */
3133         if (dev->data_requests)
3134                 pci_pool_destroy(dev->data_requests);
3135
3136         if (dev->stp_requests) {
3137                 /* cleanup DMA desc's for ep0in */
3138                 pci_pool_free(dev->stp_requests,
3139                         dev->ep[UDC_EP0OUT_IX].td_stp,
3140                         dev->ep[UDC_EP0OUT_IX].td_stp_dma);
3141                 pci_pool_free(dev->stp_requests,
3142                         dev->ep[UDC_EP0OUT_IX].td,
3143                         dev->ep[UDC_EP0OUT_IX].td_phys);
3144
3145                 pci_pool_destroy(dev->stp_requests);
3146         }
3147
3148         /* reset controller */
3149         writel(AMD_BIT(UDC_DEVCFG_SOFTRESET), &dev->regs->cfg);
3150         if (dev->irq_registered)
3151                 free_irq(pdev->irq, dev);
3152         if (dev->regs)
3153                 iounmap(dev->regs);
3154         if (dev->mem_region)
3155                 release_mem_region(pci_resource_start(pdev, 0),
3156                                 pci_resource_len(pdev, 0));
3157         if (dev->active)
3158                 pci_disable_device(pdev);
3159
3160         device_unregister(&dev->gadget.dev);
3161         pci_set_drvdata(pdev, NULL);
3162
3163         udc_remove(dev);
3164 }
3165
3166 /* create dma pools on init */
3167 static int init_dma_pools(struct udc *dev)
3168 {
3169         struct udc_stp_dma      *td_stp;
3170         struct udc_data_dma     *td_data;
3171         int retval;
3172
3173         /* consistent DMA mode setting ? */
3174         if (use_dma_ppb) {
3175                 use_dma_bufferfill_mode = 0;
3176         } else {
3177                 use_dma_ppb_du = 0;
3178                 use_dma_bufferfill_mode = 1;
3179         }
3180
3181         /* DMA setup */
3182         dev->data_requests = dma_pool_create("data_requests", NULL,
3183                 sizeof(struct udc_data_dma), 0, 0);
3184         if (!dev->data_requests) {
3185                 DBG(dev, "can't get request data pool\n");
3186                 retval = -ENOMEM;
3187                 goto finished;
3188         }
3189
3190         /* EP0 in dma regs = dev control regs */
3191         dev->ep[UDC_EP0IN_IX].dma = &dev->regs->ctl;
3192
3193         /* dma desc for setup data */
3194         dev->stp_requests = dma_pool_create("setup requests", NULL,
3195                 sizeof(struct udc_stp_dma), 0, 0);
3196         if (!dev->stp_requests) {
3197                 DBG(dev, "can't get stp request pool\n");
3198                 retval = -ENOMEM;
3199                 goto finished;
3200         }
3201         /* setup */
3202         td_stp = dma_pool_alloc(dev->stp_requests, GFP_KERNEL,
3203                                 &dev->ep[UDC_EP0OUT_IX].td_stp_dma);
3204         if (td_stp == NULL) {
3205                 retval = -ENOMEM;
3206                 goto finished;
3207         }
3208         dev->ep[UDC_EP0OUT_IX].td_stp = td_stp;
3209
3210         /* data: 0 packets !? */
3211         td_data = dma_pool_alloc(dev->stp_requests, GFP_KERNEL,
3212                                 &dev->ep[UDC_EP0OUT_IX].td_phys);
3213         if (td_data == NULL) {
3214                 retval = -ENOMEM;
3215                 goto finished;
3216         }
3217         dev->ep[UDC_EP0OUT_IX].td = td_data;
3218         return 0;
3219
3220 finished:
3221         return retval;
3222 }
3223
3224 /* Called by pci bus driver to init pci context */
3225 static int udc_pci_probe(
3226         struct pci_dev *pdev,
3227         const struct pci_device_id *id
3228 )
3229 {
3230         struct udc              *dev;
3231         unsigned long           resource;
3232         unsigned long           len;
3233         int                     retval = 0;
3234
3235         /* one udc only */
3236         if (udc) {
3237                 dev_dbg(&pdev->dev, "already probed\n");
3238                 return -EBUSY;
3239         }
3240
3241         /* init */
3242         dev = kzalloc(sizeof(struct udc), GFP_KERNEL);
3243         if (!dev) {
3244                 retval = -ENOMEM;
3245                 goto finished;
3246         }
3247         memset(dev, 0, sizeof(struct udc));
3248
3249         /* pci setup */
3250         if (pci_enable_device(pdev) < 0) {
3251                 retval = -ENODEV;
3252                 goto finished;
3253         }
3254         dev->active = 1;
3255
3256         /* PCI resource allocation */
3257         resource = pci_resource_start(pdev, 0);
3258         len = pci_resource_len(pdev, 0);
3259
3260         if (!request_mem_region(resource, len, name)) {
3261                 dev_dbg(&pdev->dev, "pci device used already\n");
3262                 retval = -EBUSY;
3263                 goto finished;
3264         }
3265         dev->mem_region = 1;
3266
3267         dev->virt_addr = ioremap_nocache(resource, len);
3268         if (dev->virt_addr == NULL) {
3269                 dev_dbg(&pdev->dev, "start address cannot be mapped\n");
3270                 retval = -EFAULT;
3271                 goto finished;
3272         }
3273
3274         if (!pdev->irq) {
3275                 dev_err(&dev->pdev->dev, "irq not set\n");
3276                 retval = -ENODEV;
3277                 goto finished;
3278         }
3279
3280         if (request_irq(pdev->irq, udc_irq, IRQF_SHARED, name, dev) != 0) {
3281                 dev_dbg(&dev->pdev->dev, "request_irq(%d) fail\n", pdev->irq);
3282                 retval = -EBUSY;
3283                 goto finished;
3284         }
3285         dev->irq_registered = 1;
3286
3287         pci_set_drvdata(pdev, dev);
3288
3289         /* chip revision */
3290         dev->chiprev = 0;
3291
3292         pci_set_master(pdev);
3293         pci_set_mwi(pdev);
3294
3295         /* chip rev for Hs AMD5536 */
3296         pci_read_config_byte(pdev, PCI_REVISION_ID, (u8 *) &dev->chiprev);
3297         /* init dma pools */
3298         if (use_dma) {
3299                 retval = init_dma_pools(dev);
3300                 if (retval != 0)
3301                         goto finished;
3302         }
3303
3304         dev->phys_addr = resource;
3305         dev->irq = pdev->irq;
3306         dev->pdev = pdev;
3307         dev->gadget.dev.parent = &pdev->dev;
3308         dev->gadget.dev.dma_mask = pdev->dev.dma_mask;
3309
3310         /* general probing */
3311         if (udc_probe(dev) == 0)
3312                 return 0;
3313
3314 finished:
3315         if (dev)
3316                 udc_pci_remove(pdev);
3317         return retval;
3318 }
3319
3320 /* general probe */
3321 static int udc_probe(struct udc *dev)
3322 {
3323         char            tmp[128];
3324         u32             reg;
3325         int             retval;
3326
3327         /* mark timer as not initialized */
3328         udc_timer.data = 0;
3329         udc_pollstall_timer.data = 0;
3330
3331         /* device struct setup */
3332         spin_lock_init(&dev->lock);
3333         dev->gadget.ops = &udc_ops;
3334
3335         strcpy(dev->gadget.dev.bus_id, "gadget");
3336         dev->gadget.dev.release = gadget_release;
3337         dev->gadget.name = name;
3338         dev->gadget.name = name;
3339         dev->gadget.is_dualspeed = 1;
3340
3341         /* udc csr registers base */
3342         dev->csr = dev->virt_addr + UDC_CSR_ADDR;
3343         /* dev registers base */
3344         dev->regs = dev->virt_addr + UDC_DEVCFG_ADDR;
3345         /* ep registers base */
3346         dev->ep_regs = dev->virt_addr + UDC_EPREGS_ADDR;
3347         /* fifo's base */
3348         dev->rxfifo = (u32 __iomem *)(dev->virt_addr + UDC_RXFIFO_ADDR);
3349         dev->txfifo = (u32 __iomem *)(dev->virt_addr + UDC_TXFIFO_ADDR);
3350
3351         /* init registers, interrupts, ... */
3352         startup_registers(dev);
3353
3354         dev_info(&dev->pdev->dev, "%s\n", mod_desc);
3355
3356         snprintf(tmp, sizeof tmp, "%d", dev->irq);
3357         dev_info(&dev->pdev->dev,
3358                 "irq %s, pci mem %08lx, chip rev %02x(Geode5536 %s)\n",
3359                 tmp, dev->phys_addr, dev->chiprev,
3360                 (dev->chiprev == UDC_HSA0_REV) ? "A0" : "B1");
3361         strcpy(tmp, UDC_DRIVER_VERSION_STRING);
3362         if (dev->chiprev == UDC_HSA0_REV) {
3363                 dev_err(&dev->pdev->dev, "chip revision is A0; too old\n");
3364                 retval = -ENODEV;
3365                 goto finished;
3366         }
3367         dev_info(&dev->pdev->dev,
3368                 "driver version: %s(for Geode5536 B1)\n", tmp);
3369         udc = dev;
3370
3371         retval = device_register(&dev->gadget.dev);
3372         if (retval)
3373                 goto finished;
3374
3375         /* timer init */
3376         init_timer(&udc_timer);
3377         udc_timer.function = udc_timer_function;
3378         udc_timer.data = 1;
3379         /* timer pollstall init */
3380         init_timer(&udc_pollstall_timer);
3381         udc_pollstall_timer.function = udc_pollstall_timer_function;
3382         udc_pollstall_timer.data = 1;
3383
3384         /* set SD */
3385         reg = readl(&dev->regs->ctl);
3386         reg |= AMD_BIT(UDC_DEVCTL_SD);
3387         writel(reg, &dev->regs->ctl);
3388
3389         /* print dev register info */
3390         print_regs(dev);
3391
3392         return 0;
3393
3394 finished:
3395         return retval;
3396 }
3397
3398 /* Initiates a remote wakeup */
3399 static int udc_remote_wakeup(struct udc *dev)
3400 {
3401         unsigned long flags;
3402         u32 tmp;
3403
3404         DBG(dev, "UDC initiates remote wakeup\n");
3405
3406         spin_lock_irqsave(&dev->lock, flags);
3407
3408         tmp = readl(&dev->regs->ctl);
3409         tmp |= AMD_BIT(UDC_DEVCTL_RES);
3410         writel(tmp, &dev->regs->ctl);
3411         tmp &= AMD_CLEAR_BIT(UDC_DEVCTL_RES);
3412         writel(tmp, &dev->regs->ctl);
3413
3414         spin_unlock_irqrestore(&dev->lock, flags);
3415         return 0;
3416 }
3417
3418 /* PCI device parameters */
3419 static const struct pci_device_id pci_id[] = {
3420         {
3421                 PCI_DEVICE(PCI_VENDOR_ID_AMD, 0x2096),
3422                 .class =        (PCI_CLASS_SERIAL_USB << 8) | 0xfe,
3423                 .class_mask =   0xffffffff,
3424         },
3425         {},
3426 };
3427 MODULE_DEVICE_TABLE(pci, pci_id);
3428
3429 /* PCI functions */
3430 static struct pci_driver udc_pci_driver = {
3431         .name =         (char *) name,
3432         .id_table =     pci_id,
3433         .probe =        udc_pci_probe,
3434         .remove =       udc_pci_remove,
3435 };
3436
3437 /* Inits driver */
3438 static int __init init(void)
3439 {
3440         return pci_register_driver(&udc_pci_driver);
3441 }
3442 module_init(init);
3443
3444 /* Cleans driver */
3445 static void __exit cleanup(void)
3446 {
3447         pci_unregister_driver(&udc_pci_driver);
3448 }
3449 module_exit(cleanup);
3450
3451 MODULE_DESCRIPTION(UDC_MOD_DESCRIPTION);
3452 MODULE_AUTHOR("Thomas Dahlmann");
3453 MODULE_LICENSE("GPL");
3454