drivers/usb/host/ohci-au1xxx.c

   1 /*
   2  * OHCI HCD (Host Controller Driver) for USB.
   3  *
   4  * (C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at>
   5  * (C) Copyright 2000-2002 David Brownell <dbrownell@users.sourceforge.net>
   6  * (C) Copyright 2002 Hewlett-Packard Company
   7  *
   8  * Bus Glue for AMD Alchemy Au1xxx
   9  *
  10  * Written by Christopher Hoover <ch@hpl.hp.com>
  11  * Based on fragments of previous driver by Rusell King et al.
  12  *
  13  * Modified for LH7A404 from ohci-sa1111.c
  14  *  by Durgesh Pattamatta <pattamattad@sharpsec.com>
  15  * Modified for AMD Alchemy Au1xxx
  16  *  by Matt Porter <mporter@kernel.crashing.org>
  17  *
  18  * This file is licenced under the GPL.
  19  */
  20
  21 #include <linux/platform_device.h>
  22 #include <linux/signal.h>
  23
  24 #include <asm/mach-au1x00/au1000.h>
  25
  26 #ifndef CONFIG_SOC_AU1200
  27
  28 #define USBH_ENABLE_BE (1<<0)
  29 #define USBH_ENABLE_C  (1<<1)
  30 #define USBH_ENABLE_E  (1<<2)
  31 #define USBH_ENABLE_CE (1<<3)
  32 #define USBH_ENABLE_RD (1<<4)
  33
  34 #ifdef __LITTLE_ENDIAN
  35 #define USBH_ENABLE_INIT (USBH_ENABLE_CE | USBH_ENABLE_E | USBH_ENABLE_C)
  36 #elif __BIG_ENDIAN
  37 #define USBH_ENABLE_INIT (USBH_ENABLE_CE | USBH_ENABLE_E | USBH_ENABLE_C | USBH_ENABLE_BE)
  38 #else
  39 #error not byte order defined
  40 #endif
  41
  42 #else   /* Au1200 */
  43
  44 #define USB_HOST_CONFIG    (USB_MSR_BASE + USB_MSR_MCFG)
  45 #define USB_MCFG_PFEN     (1<<31)
  46 #define USB_MCFG_RDCOMB   (1<<30)
  47 #define USB_MCFG_SSDEN    (1<<23)
  48 #define USB_MCFG_OHCCLKEN (1<<16)
  49 #define USB_MCFG_UCAM     (1<<7)
  50 #define USB_MCFG_OBMEN    (1<<1)
  51 #define USB_MCFG_OMEMEN   (1<<0)
  52
  53 #define USBH_ENABLE_CE    USB_MCFG_OHCCLKEN
  54 #ifdef CONFIG_DMA_COHERENT
  55 #define USBH_ENABLE_INIT  (USB_MCFG_OHCCLKEN \
  56                          | USB_MCFG_PFEN | USB_MCFG_RDCOMB \
  57                          | USB_MCFG_SSDEN | USB_MCFG_UCAM \
  58                          | USB_MCFG_OBMEN | USB_MCFG_OMEMEN)
  59 #else
  60 #define USBH_ENABLE_INIT  (USB_MCFG_OHCCLKEN \
  61                          | USB_MCFG_PFEN | USB_MCFG_RDCOMB \
  62                          | USB_MCFG_SSDEN \
  63                          | USB_MCFG_OBMEN | USB_MCFG_OMEMEN)
  64 #endif
  65 #define USBH_DISABLE      (USB_MCFG_OBMEN | USB_MCFG_OMEMEN)
  66
  67 #endif  /* Au1200 */
  68
  69 extern int usb_disabled(void);
  70
  71 /*-------------------------------------------------------------------------*/
  72
  73 static void au1xxx_start_ohc(struct platform_device *dev)
  74 {
  75         printk(KERN_DEBUG __FILE__
  76                 ": starting Au1xxx OHCI USB Controller\n");
  77
  78         /* enable host controller */
  79
  80 #ifndef CONFIG_SOC_AU1200
  81
  82         au_writel(USBH_ENABLE_CE, USB_HOST_CONFIG);
  83         udelay(1000);
  84         au_writel(USBH_ENABLE_INIT, USB_HOST_CONFIG);
  85         udelay(1000);
  86
  87 #else   /* Au1200 */
  88
  89         /* write HW defaults again in case Yamon cleared them */
  90         if (au_readl(USB_HOST_CONFIG) == 0) {
  91                 au_writel(0x00d02000, USB_HOST_CONFIG);
  92                 au_readl(USB_HOST_CONFIG);
  93                 udelay(1000);
  94         }
  95         au_writel(USBH_ENABLE_CE | au_readl(USB_HOST_CONFIG), USB_HOST_CONFIG);
  96         au_readl(USB_HOST_CONFIG);
  97         udelay(1000);
  98         au_writel(USBH_ENABLE_INIT | au_readl(USB_HOST_CONFIG), USB_HOST_CONFIG);
  99         au_readl(USB_HOST_CONFIG);
 100         udelay(1000);
 101
 102 #endif  /* Au1200 */
 103
 104 #ifndef CONFIG_SOC_AU1200
 105         /* wait for reset complete (read register twice; see au1500 errata) */
 106         while (au_readl(USB_HOST_CONFIG),
 107                 !(au_readl(USB_HOST_CONFIG) & USBH_ENABLE_RD))
 108 #endif
 109                 udelay(1000);
 110
 111         printk(KERN_DEBUG __FILE__
 112         ": Clock to USB host has been enabled \n");
 113 }
 114
 115 static void au1xxx_stop_ohc(struct platform_device *dev)
 116 {
 117         printk(KERN_DEBUG __FILE__
 118                ": stopping Au1xxx OHCI USB Controller\n");
 119
 120 #ifndef CONFIG_SOC_AU1200
 121
 122         /* Disable clock */
 123         au_writel(au_readl(USB_HOST_CONFIG) & ~USBH_ENABLE_CE, USB_HOST_CONFIG);
 124
 125 #else   /* Au1200 */
 126
 127         /* Disable mem */
 128         au_writel(~USBH_DISABLE & au_readl(USB_HOST_CONFIG), USB_HOST_CONFIG);
 129         udelay(1000);
 130         /* Disable clock */
 131         au_writel(~USBH_ENABLE_CE & au_readl(USB_HOST_CONFIG), USB_HOST_CONFIG);
 132         au_readl(USB_HOST_CONFIG);
 133 #endif  /* Au1200 */
 134 }
 135
 136
 137 /*-------------------------------------------------------------------------*/
 138
 139 /* configure so an HC device and id are always provided */
 140 /* always called with process context; sleeping is OK */
 141
 142
 143 /**
 144  * usb_ohci_au1xxx_probe - initialize Au1xxx-based HCDs
 145  * Context: !in_interrupt()
 146  *
 147  * Allocates basic resources for this USB host controller, and
 148  * then invokes the start() method for the HCD associated with it
 149  * through the hotplug entry's driver_data.
 150  *
 151  */
 152 static int usb_ohci_au1xxx_probe(const struct hc_driver *driver,
 153                           struct platform_device *dev)
 154 {
 155         int retval;
 156         struct usb_hcd *hcd;
 157
 158 #if defined(CONFIG_SOC_AU1200) && defined(CONFIG_DMA_COHERENT)
 159         /* Au1200 AB USB does not support coherent memory */
 160         if (!(read_c0_prid() & 0xff)) {
 161                 pr_info("%s: this is chip revision AB !!\n",
 162                         dev->name);
 163                 pr_info("%s: update your board or re-configure the kernel\n",
 164                         dev->name);
 165                 return -ENODEV;
 166         }
 167 #endif
 168
 169         if (dev->resource[1].flags != IORESOURCE_IRQ) {
 170                 pr_debug("resource[1] is not IORESOURCE_IRQ\n");
 171                 return -ENOMEM;
 172         }
 173
 174         hcd = usb_create_hcd(driver, &dev->dev, "au1xxx");
 175         if (!hcd)
 176                 return -ENOMEM;
 177         hcd->rsrc_start = dev->resource[0].start;
 178         hcd->rsrc_len = dev->resource[0].end - dev->resource[0].start + 1;
 179
 180         if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
 181                 pr_debug("request_mem_region failed\n");
 182                 retval = -EBUSY;
 183                 goto err1;
 184         }
 185
 186         hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
 187         if (!hcd->regs) {
 188                 pr_debug("ioremap failed\n");
 189                 retval = -ENOMEM;
 190                 goto err2;
 191         }
 192
 193         au1xxx_start_ohc(dev);
 194         ohci_hcd_init(hcd_to_ohci(hcd));
 195
 196         retval = usb_add_hcd(hcd, dev->resource[1].start, IRQF_DISABLED | IRQF_SHARED);
 197         if (retval == 0)
 198                 return retval;
 199
 200         au1xxx_stop_ohc(dev);
 201         iounmap(hcd->regs);
 202  err2:
 203         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 204  err1:
 205         usb_put_hcd(hcd);
 206         return retval;
 207 }
 208
 209
 210 /* may be called without controller electrically present */
 211 /* may be called with controller, bus, and devices active */
 212
 213 /**
 214  * usb_hcd_au1xxx_remove - shutdown processing for Au1xxx-based HCDs
 215  * @dev: USB Host Controller being removed
 216  * Context: !in_interrupt()
 217  *
 218  * Reverses the effect of usb_hcd_au1xxx_probe(), first invoking
 219  * the HCD's stop() method.  It is always called from a thread
 220  * context, normally "rmmod", "apmd", or something similar.
 221  *
 222  */
 223 static void usb_ohci_au1xxx_remove(struct usb_hcd *hcd, struct platform_device *dev)
 224 {
 225         usb_remove_hcd(hcd);
 226         au1xxx_stop_ohc(dev);
 227         iounmap(hcd->regs);
 228         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 229         usb_put_hcd(hcd);
 230 }
 231
 232 /*-------------------------------------------------------------------------*/
 233
 234 static int __devinit
 235 ohci_au1xxx_start (struct usb_hcd *hcd)
 236 {
 237         struct ohci_hcd *ohci = hcd_to_ohci (hcd);
 238         int             ret;
 239
 240         ohci_dbg (ohci, "ohci_au1xxx_start, ohci:%p", ohci);
 241
 242         if ((ret = ohci_init (ohci)) < 0)
 243                 return ret;
 244
 245         if ((ret = ohci_run (ohci)) < 0) {
 246                 err ("can't start %s", hcd->self.bus_name);
 247                 ohci_stop (hcd);
 248                 return ret;
 249         }
 250
 251         return 0;
 252 }
 253
 254 /*-------------------------------------------------------------------------*/
 255
 256 static const struct hc_driver ohci_au1xxx_hc_driver = {
 257         .description =          hcd_name,
 258         .product_desc =         "Au1xxx OHCI",
 259         .hcd_priv_size =        sizeof(struct ohci_hcd),
 260
 261         /*
 262          * generic hardware linkage
 263          */
 264         .irq =                  ohci_irq,
 265         .flags =                HCD_USB11 | HCD_MEMORY,
 266
 267         /*
 268          * basic lifecycle operations
 269          */
 270         .start =                ohci_au1xxx_start,
 271         .stop =                 ohci_stop,
 272         .shutdown =             ohci_shutdown,
 273
 274         /*
 275          * managing i/o requests and associated device resources
 276          */
 277         .urb_enqueue =          ohci_urb_enqueue,
 278         .urb_dequeue =          ohci_urb_dequeue,
 279         .endpoint_disable =     ohci_endpoint_disable,
 280
 281         /*
 282          * scheduling support
 283          */
 284         .get_frame_number =     ohci_get_frame,
 285
 286         /*
 287          * root hub support
 288          */
 289         .hub_status_data =      ohci_hub_status_data,
 290         .hub_control =          ohci_hub_control,
 291         .hub_irq_enable =       ohci_rhsc_enable,
 292 #ifdef  CONFIG_PM
 293         .bus_suspend =          ohci_bus_suspend,
 294         .bus_resume =           ohci_bus_resume,
 295 #endif
 296         .start_port_reset =     ohci_start_port_reset,
 297 };
 298
 299 /*-------------------------------------------------------------------------*/
 300
 301 static int ohci_hcd_au1xxx_drv_probe(struct platform_device *pdev)
 302 {
 303         int ret;
 304
 305         pr_debug ("In ohci_hcd_au1xxx_drv_probe");
 306
 307         if (usb_disabled())
 308                 return -ENODEV;
 309
 310         ret = usb_ohci_au1xxx_probe(&ohci_au1xxx_hc_driver, pdev);
 311         return ret;
 312 }
 313
 314 static int ohci_hcd_au1xxx_drv_remove(struct platform_device *pdev)
 315 {
 316         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 317
 318         usb_ohci_au1xxx_remove(hcd, pdev);
 319         return 0;
 320 }
 321         /*TBD*/
 322 /*static int ohci_hcd_au1xxx_drv_suspend(struct platform_device *dev)
 323 {
 324         struct usb_hcd *hcd = platform_get_drvdata(dev);
 325
 326         return 0;
 327 }
 328 static int ohci_hcd_au1xxx_drv_resume(struct platform_device *dev)
 329 {
 330         struct usb_hcd *hcd = platform_get_drvdata(dev);
 331
 332         return 0;
 333 }
 334 */
 335
 336 static struct platform_driver ohci_hcd_au1xxx_driver = {
 337         .probe          = ohci_hcd_au1xxx_drv_probe,
 338         .remove         = ohci_hcd_au1xxx_drv_remove,
 339         .shutdown       = usb_hcd_platform_shutdown,
 340         /*.suspend      = ohci_hcd_au1xxx_drv_suspend, */
 341         /*.resume       = ohci_hcd_au1xxx_drv_resume, */
 342         .driver         = {
 343                 .name   = "au1xxx-ohci",
 344                 .owner  = THIS_MODULE,
 345         },
 346 };
 347
 348 MODULE_ALIAS("platform:au1xxx-ohci");