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 #endif
 114 }
 115
 116 static void au1xxx_stop_ohc(struct platform_device *dev)
 117 {
 118         printk(KERN_DEBUG __FILE__
 119                ": stopping Au1xxx OHCI USB Controller\n");
 120
 121 #ifndef CONFIG_SOC_AU1200
 122
 123         /* Disable clock */
 124         au_writel(au_readl(USB_HOST_CONFIG) & ~USBH_ENABLE_CE, USB_HOST_CONFIG);
 125
 126 #else   /* Au1200 */
 127
 128         /* Disable mem */
 129         au_writel(~USBH_DISABLE & au_readl(USB_HOST_CONFIG), USB_HOST_CONFIG);
 130         udelay(1000);
 131         /* Disable clock */
 132         au_writel(~USBH_ENABLE_CE & au_readl(USB_HOST_CONFIG), USB_HOST_CONFIG);
 133         au_readl(USB_HOST_CONFIG);
 134 #endif  /* Au1200 */
 135 }
 136
 137
 138 /*-------------------------------------------------------------------------*/
 139
 140 /* configure so an HC device and id are always provided */
 141 /* always called with process context; sleeping is OK */
 142
 143
 144 /**
 145  * usb_ohci_au1xxx_probe - initialize Au1xxx-based HCDs
 146  * Context: !in_interrupt()
 147  *
 148  * Allocates basic resources for this USB host controller, and
 149  * then invokes the start() method for the HCD associated with it
 150  * through the hotplug entry's driver_data.
 151  *
 152  */
 153 static int usb_ohci_au1xxx_probe(const struct hc_driver *driver,
 154                           struct platform_device *dev)
 155 {
 156         int retval;
 157         struct usb_hcd *hcd;
 158
 159 #if defined(CONFIG_SOC_AU1200) && defined(CONFIG_DMA_COHERENT)
 160         /* Au1200 AB USB does not support coherent memory */
 161         if (!(read_c0_prid() & 0xff)) {
 162                 pr_info("%s: this is chip revision AB !!\n",
 163                         dev->name);
 164                 pr_info("%s: update your board or re-configure the kernel\n",
 165                         dev->name);
 166                 return -ENODEV;
 167         }
 168 #endif
 169
 170         if (dev->resource[1].flags != IORESOURCE_IRQ) {
 171                 pr_debug("resource[1] is not IORESOURCE_IRQ\n");
 172                 return -ENOMEM;
 173         }
 174
 175         hcd = usb_create_hcd(driver, &dev->dev, "au1xxx");
 176         if (!hcd)
 177                 return -ENOMEM;
 178         hcd->rsrc_start = dev->resource[0].start;
 179         hcd->rsrc_len = dev->resource[0].end - dev->resource[0].start + 1;
 180
 181         if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
 182                 pr_debug("request_mem_region failed\n");
 183                 retval = -EBUSY;
 184                 goto err1;
 185         }
 186
 187         hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
 188         if (!hcd->regs) {
 189                 pr_debug("ioremap failed\n");
 190                 retval = -ENOMEM;
 191                 goto err2;
 192         }
 193
 194         au1xxx_start_ohc(dev);
 195         ohci_hcd_init(hcd_to_ohci(hcd));
 196
 197         retval = usb_add_hcd(hcd, dev->resource[1].start, IRQF_DISABLED | IRQF_SHARED);
 198         if (retval == 0)
 199                 return retval;
 200
 201         au1xxx_stop_ohc(dev);
 202         iounmap(hcd->regs);
 203  err2:
 204         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 205  err1:
 206         usb_put_hcd(hcd);
 207         return retval;
 208 }
 209
 210
 211 /* may be called without controller electrically present */
 212 /* may be called with controller, bus, and devices active */
 213
 214 /**
 215  * usb_hcd_au1xxx_remove - shutdown processing for Au1xxx-based HCDs
 216  * @dev: USB Host Controller being removed
 217  * Context: !in_interrupt()
 218  *
 219  * Reverses the effect of usb_hcd_au1xxx_probe(), first invoking
 220  * the HCD's stop() method.  It is always called from a thread
 221  * context, normally "rmmod", "apmd", or something similar.
 222  *
 223  */
 224 static void usb_ohci_au1xxx_remove(struct usb_hcd *hcd, struct platform_device *dev)
 225 {
 226         usb_remove_hcd(hcd);
 227         au1xxx_stop_ohc(dev);
 228         iounmap(hcd->regs);
 229         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 230         usb_put_hcd(hcd);
 231 }
 232
 233 /*-------------------------------------------------------------------------*/
 234
 235 static int __devinit
 236 ohci_au1xxx_start (struct usb_hcd *hcd)
 237 {
 238         struct ohci_hcd *ohci = hcd_to_ohci (hcd);
 239         int             ret;
 240
 241         ohci_dbg (ohci, "ohci_au1xxx_start, ohci:%p", ohci);
 242
 243         if ((ret = ohci_init (ohci)) < 0)
 244                 return ret;
 245
 246         if ((ret = ohci_run (ohci)) < 0) {
 247                 err ("can't start %s", hcd->self.bus_name);
 248                 ohci_stop (hcd);
 249                 return ret;
 250         }
 251
 252         return 0;
 253 }
 254
 255 /*-------------------------------------------------------------------------*/
 256
 257 static const struct hc_driver ohci_au1xxx_hc_driver = {
 258         .description =          hcd_name,
 259         .product_desc =         "Au1xxx OHCI",
 260         .hcd_priv_size =        sizeof(struct ohci_hcd),
 261
 262         /*
 263          * generic hardware linkage
 264          */
 265         .irq =                  ohci_irq,
 266         .flags =                HCD_USB11 | HCD_MEMORY,
 267
 268         /*
 269          * basic lifecycle operations
 270          */
 271         .start =                ohci_au1xxx_start,
 272 #ifdef  CONFIG_PM
 273         /* suspend:             ohci_au1xxx_suspend,  -- tbd */
 274         /* resume:              ohci_au1xxx_resume,   -- tbd */
 275 #endif /*CONFIG_PM*/
 276         .stop =                 ohci_stop,
 277
 278         /*
 279          * managing i/o requests and associated device resources
 280          */
 281         .urb_enqueue =          ohci_urb_enqueue,
 282         .urb_dequeue =          ohci_urb_dequeue,
 283         .endpoint_disable =     ohci_endpoint_disable,
 284
 285         /*
 286          * scheduling support
 287          */
 288         .get_frame_number =     ohci_get_frame,
 289
 290         /*
 291          * root hub support
 292          */
 293         .hub_status_data =      ohci_hub_status_data,
 294         .hub_control =          ohci_hub_control,
 295 #ifdef  CONFIG_PM
 296         .bus_suspend =          ohci_bus_suspend,
 297         .bus_resume =           ohci_bus_resume,
 298 #endif
 299         .start_port_reset =     ohci_start_port_reset,
 300 };
 301
 302 /*-------------------------------------------------------------------------*/
 303
 304 static int ohci_hcd_au1xxx_drv_probe(struct platform_device *pdev)
 305 {
 306         int ret;
 307
 308         pr_debug ("In ohci_hcd_au1xxx_drv_probe");
 309
 310         if (usb_disabled())
 311                 return -ENODEV;
 312
 313         ret = usb_ohci_au1xxx_probe(&ohci_au1xxx_hc_driver, pdev);
 314         return ret;
 315 }
 316
 317 static int ohci_hcd_au1xxx_drv_remove(struct platform_device *pdev)
 318 {
 319         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 320
 321         usb_ohci_au1xxx_remove(hcd, pdev);
 322         return 0;
 323 }
 324         /*TBD*/
 325 /*static int ohci_hcd_au1xxx_drv_suspend(struct platform_device *dev)
 326 {
 327         struct usb_hcd *hcd = platform_get_drvdata(dev);
 328
 329         return 0;
 330 }
 331 static int ohci_hcd_au1xxx_drv_resume(struct platform_device *dev)
 332 {
 333         struct usb_hcd *hcd = platform_get_drvdata(dev);
 334
 335         return 0;
 336 }
 337 */
 338
 339 static struct platform_driver ohci_hcd_au1xxx_driver = {
 340         .probe          = ohci_hcd_au1xxx_drv_probe,
 341         .remove         = ohci_hcd_au1xxx_drv_remove,
 342         /*.suspend      = ohci_hcd_au1xxx_drv_suspend, */
 343         /*.resume       = ohci_hcd_au1xxx_drv_resume, */
 344         .driver         = {
 345                 .name   = "au1xxx-ohci",
 346                 .owner  = THIS_MODULE,
 347         },
 348 };
 349
 350 static int __init ohci_hcd_au1xxx_init (void)
 351 {
 352         pr_debug (DRIVER_INFO " (Au1xxx)");
 353         pr_debug ("block sizes: ed %d td %d\n",
 354                 sizeof (struct ed), sizeof (struct td));
 355
 356         return platform_driver_register(&ohci_hcd_au1xxx_driver);
 357 }
 358
 359 static void __exit ohci_hcd_au1xxx_cleanup (void)
 360 {
 361         platform_driver_unregister(&ohci_hcd_au1xxx_driver);
 362 }
 363
 364 module_init (ohci_hcd_au1xxx_init);
 365 module_exit (ohci_hcd_au1xxx_cleanup);