drivers/usb/host/ehci-au1xxx.c

   1 /*
   2  * EHCI HCD (Host Controller Driver) for USB.
   3  *
   4  * Bus Glue for AMD Alchemy Au1xxx
   5  *
   6  * Based on "ohci-au1xxx.c" by Matt Porter <mporter@kernel.crashing.org>
   7  *
   8  * Modified for AMD Alchemy Au1200 EHC
   9  *  by K.Boge <karsten.boge@amd.com>
  10  *
  11  * This file is licenced under the GPL.
  12  */
  13
  14 #include <linux/platform_device.h>
  15 #include <asm/mach-au1x00/au1000.h>
  16
  17 #define USB_HOST_CONFIG   (USB_MSR_BASE + USB_MSR_MCFG)
  18 #define USB_MCFG_PFEN     (1<<31)
  19 #define USB_MCFG_RDCOMB   (1<<30)
  20 #define USB_MCFG_SSDEN    (1<<23)
  21 #define USB_MCFG_PHYPLLEN (1<<19)
  22 #define USB_MCFG_UCECLKEN (1<<18)
  23 #define USB_MCFG_EHCCLKEN (1<<17)
  24 #ifdef CONFIG_DMA_COHERENT
  25 #define USB_MCFG_UCAM     (1<<7)
  26 #else
  27 #define USB_MCFG_UCAM     (0)
  28 #endif
  29 #define USB_MCFG_EBMEN    (1<<3)
  30 #define USB_MCFG_EMEMEN   (1<<2)
  31
  32 #define USBH_ENABLE_CE  (USB_MCFG_PHYPLLEN | USB_MCFG_EHCCLKEN)
  33 #define USBH_ENABLE_INIT (USB_MCFG_PFEN  | USB_MCFG_RDCOMB |    \
  34                           USBH_ENABLE_CE | USB_MCFG_SSDEN  |    \
  35                           USB_MCFG_UCAM  | USB_MCFG_EBMEN  |    \
  36                           USB_MCFG_EMEMEN)
  37
  38 #define USBH_DISABLE      (USB_MCFG_EBMEN | USB_MCFG_EMEMEN)
  39
  40 extern int usb_disabled(void);
  41
  42 static void au1xxx_start_ehc(void)
  43 {
  44         /* enable clock to EHCI block and HS PHY PLL*/
  45         au_writel(au_readl(USB_HOST_CONFIG) | USBH_ENABLE_CE, USB_HOST_CONFIG);
  46         au_sync();
  47         udelay(1000);
  48
  49         /* enable EHCI mmio */
  50         au_writel(au_readl(USB_HOST_CONFIG) | USBH_ENABLE_INIT, USB_HOST_CONFIG);
  51         au_sync();
  52         udelay(1000);
  53 }
  54
  55 static void au1xxx_stop_ehc(void)
  56 {
  57         unsigned long c;
  58
  59         /* Disable mem */
  60         au_writel(au_readl(USB_HOST_CONFIG) & ~USBH_DISABLE, USB_HOST_CONFIG);
  61         au_sync();
  62         udelay(1000);
  63
  64         /* Disable EHC clock. If the HS PHY is unused disable it too. */
  65         c = au_readl(USB_HOST_CONFIG) & ~USB_MCFG_EHCCLKEN;
  66         if (!(c & USB_MCFG_UCECLKEN))           /* UDC disabled? */
  67                 c &= ~USB_MCFG_PHYPLLEN;        /* yes: disable HS PHY PLL */
  68         au_writel(c, USB_HOST_CONFIG);
  69         au_sync();
  70 }
  71
  72 static const struct hc_driver ehci_au1xxx_hc_driver = {
  73         .description            = hcd_name,
  74         .product_desc           = "Au1xxx EHCI",
  75         .hcd_priv_size          = sizeof(struct ehci_hcd),
  76
  77         /*
  78          * generic hardware linkage
  79          */
  80         .irq                    = ehci_irq,
  81         .flags                  = HCD_MEMORY | HCD_USB2,
  82
  83         /*
  84          * basic lifecycle operations
  85          *
  86          * FIXME -- ehci_init() doesn't do enough here.
  87          * See ehci-ppc-soc for a complete implementation.
  88          */
  89         .reset                  = ehci_init,
  90         .start                  = ehci_run,
  91         .stop                   = ehci_stop,
  92         .shutdown               = ehci_shutdown,
  93
  94         /*
  95          * managing i/o requests and associated device resources
  96          */
  97         .urb_enqueue            = ehci_urb_enqueue,
  98         .urb_dequeue            = ehci_urb_dequeue,
  99         .endpoint_disable       = ehci_endpoint_disable,
 100         .endpoint_reset         = ehci_endpoint_reset,
 101
 102         /*
 103          * scheduling support
 104          */
 105         .get_frame_number       = ehci_get_frame,
 106
 107         /*
 108          * root hub support
 109          */
 110         .hub_status_data        = ehci_hub_status_data,
 111         .hub_control            = ehci_hub_control,
 112         .bus_suspend            = ehci_bus_suspend,
 113         .bus_resume             = ehci_bus_resume,
 114         .relinquish_port        = ehci_relinquish_port,
 115         .port_handed_over       = ehci_port_handed_over,
 116 };
 117
 118 static int ehci_hcd_au1xxx_drv_probe(struct platform_device *pdev)
 119 {
 120         struct usb_hcd *hcd;
 121         struct ehci_hcd *ehci;
 122         int ret;
 123
 124         if (usb_disabled())
 125                 return -ENODEV;
 126
 127 #if defined(CONFIG_SOC_AU1200) && defined(CONFIG_DMA_COHERENT)
 128         /* Au1200 AB USB does not support coherent memory */
 129         if (!(read_c0_prid() & 0xff)) {
 130                 printk(KERN_INFO "%s: this is chip revision AB!\n", pdev->name);
 131                 printk(KERN_INFO "%s: update your board or re-configure"
 132                                  " the kernel\n", pdev->name);
 133                 return -ENODEV;
 134         }
 135 #endif
 136
 137         if (pdev->resource[1].flags != IORESOURCE_IRQ) {
 138                 pr_debug("resource[1] is not IORESOURCE_IRQ");
 139                 return -ENOMEM;
 140         }
 141         hcd = usb_create_hcd(&ehci_au1xxx_hc_driver, &pdev->dev, "Au1xxx");
 142         if (!hcd)
 143                 return -ENOMEM;
 144
 145         hcd->rsrc_start = pdev->resource[0].start;
 146         hcd->rsrc_len = pdev->resource[0].end - pdev->resource[0].start + 1;
 147
 148         if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
 149                 pr_debug("request_mem_region failed");
 150                 ret = -EBUSY;
 151                 goto err1;
 152         }
 153
 154         hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
 155         if (!hcd->regs) {
 156                 pr_debug("ioremap failed");
 157                 ret = -ENOMEM;
 158                 goto err2;
 159         }
 160
 161         au1xxx_start_ehc();
 162
 163         ehci = hcd_to_ehci(hcd);
 164         ehci->caps = hcd->regs;
 165         ehci->regs = hcd->regs + HC_LENGTH(readl(&ehci->caps->hc_capbase));
 166         /* cache this readonly data; minimize chip reads */
 167         ehci->hcs_params = readl(&ehci->caps->hcs_params);
 168
 169         ret = usb_add_hcd(hcd, pdev->resource[1].start,
 170                           IRQF_DISABLED | IRQF_SHARED);
 171         if (ret == 0) {
 172                 platform_set_drvdata(pdev, hcd);
 173                 return ret;
 174         }
 175
 176         au1xxx_stop_ehc();
 177         iounmap(hcd->regs);
 178 err2:
 179         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 180 err1:
 181         usb_put_hcd(hcd);
 182         return ret;
 183 }
 184
 185 static int ehci_hcd_au1xxx_drv_remove(struct platform_device *pdev)
 186 {
 187         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 188
 189         usb_remove_hcd(hcd);
 190         iounmap(hcd->regs);
 191         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 192         usb_put_hcd(hcd);
 193         au1xxx_stop_ehc();
 194         platform_set_drvdata(pdev, NULL);
 195
 196         return 0;
 197 }
 198
 199 #ifdef CONFIG_PM
 200 static int ehci_hcd_au1xxx_drv_suspend(struct platform_device *pdev,
 201                                         pm_message_t message)
 202 {
 203         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 204         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
 205         unsigned long flags;
 206         int rc;
 207
 208         return 0;
 209         rc = 0;
 210
 211         if (time_before(jiffies, ehci->next_statechange))
 212                 msleep(10);
 213
 214         /* Root hub was already suspended. Disable irq emission and
 215          * mark HW unaccessible, bail out if RH has been resumed. Use
 216          * the spinlock to properly synchronize with possible pending
 217          * RH suspend or resume activity.
 218          *
 219          * This is still racy as hcd->state is manipulated outside of
 220          * any locks =P But that will be a different fix.
 221          */
 222         spin_lock_irqsave(&ehci->lock, flags);
 223         if (hcd->state != HC_STATE_SUSPENDED) {
 224                 rc = -EINVAL;
 225                 goto bail;
 226         }
 227         ehci_writel(ehci, 0, &ehci->regs->intr_enable);
 228         (void)ehci_readl(ehci, &ehci->regs->intr_enable);
 229
 230         /* make sure snapshot being resumed re-enumerates everything */
 231         if (message.event == PM_EVENT_PRETHAW) {
 232                 ehci_halt(ehci);
 233                 ehci_reset(ehci);
 234         }
 235
 236         clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
 237
 238         au1xxx_stop_ehc();
 239
 240 bail:
 241         spin_unlock_irqrestore(&ehci->lock, flags);
 242
 243         // could save FLADJ in case of Vaux power loss
 244         // ... we'd only use it to handle clock skew
 245
 246         return rc;
 247 }
 248
 249
 250 static int ehci_hcd_au1xxx_drv_resume(struct platform_device *pdev)
 251 {
 252         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 253         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
 254
 255         au1xxx_start_ehc();
 256
 257         // maybe restore FLADJ
 258
 259         if (time_before(jiffies, ehci->next_statechange))
 260                 msleep(100);
 261
 262         /* Mark hardware accessible again as we are out of D3 state by now */
 263         set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
 264
 265         /* If CF is still set, we maintained PCI Vaux power.
 266          * Just undo the effect of ehci_pci_suspend().
 267          */
 268         if (ehci_readl(ehci, &ehci->regs->configured_flag) == FLAG_CF) {
 269                 int     mask = INTR_MASK;
 270
 271                 if (!hcd->self.root_hub->do_remote_wakeup)
 272                         mask &= ~STS_PCD;
 273                 ehci_writel(ehci, mask, &ehci->regs->intr_enable);
 274                 ehci_readl(ehci, &ehci->regs->intr_enable);
 275                 return 0;
 276         }
 277
 278         ehci_dbg(ehci, "lost power, restarting\n");
 279         usb_root_hub_lost_power(hcd->self.root_hub);
 280
 281         /* Else reset, to cope with power loss or flush-to-storage
 282          * style "resume" having let BIOS kick in during reboot.
 283          */
 284         (void) ehci_halt(ehci);
 285         (void) ehci_reset(ehci);
 286
 287         /* emptying the schedule aborts any urbs */
 288         spin_lock_irq(&ehci->lock);
 289         if (ehci->reclaim)
 290                 end_unlink_async(ehci);
 291         ehci_work(ehci);
 292         spin_unlock_irq(&ehci->lock);
 293
 294         ehci_writel(ehci, ehci->command, &ehci->regs->command);
 295         ehci_writel(ehci, FLAG_CF, &ehci->regs->configured_flag);
 296         ehci_readl(ehci, &ehci->regs->command); /* unblock posted writes */
 297
 298         /* here we "know" root ports should always stay powered */
 299         ehci_port_power(ehci, 1);
 300
 301         hcd->state = HC_STATE_SUSPENDED;
 302
 303         return 0;
 304 }
 305
 306 #else
 307 #define ehci_hcd_au1xxx_drv_suspend NULL
 308 #define ehci_hcd_au1xxx_drv_resume NULL
 309 #endif
 310
 311 static struct platform_driver ehci_hcd_au1xxx_driver = {
 312         .probe          = ehci_hcd_au1xxx_drv_probe,
 313         .remove         = ehci_hcd_au1xxx_drv_remove,
 314         .shutdown       = usb_hcd_platform_shutdown,
 315         .suspend        = ehci_hcd_au1xxx_drv_suspend,
 316         .resume         = ehci_hcd_au1xxx_drv_resume,
 317         .driver = {
 318                 .name   = "au1xxx-ehci",
 319                 .owner  = THIS_MODULE,
 320         }
 321 };
 322
 323 MODULE_ALIAS("platform:au1xxx-ehci");