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 int au1xxx_ehci_setup(struct usb_hcd *hcd)
  73 {
  74         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
  75         int ret = ehci_init(hcd);
  76
  77         ehci->need_io_watchdog = 0;
  78         return ret;
  79 }
  80
  81 static const struct hc_driver ehci_au1xxx_hc_driver = {
  82         .description            = hcd_name,
  83         .product_desc           = "Au1xxx EHCI",
  84         .hcd_priv_size          = sizeof(struct ehci_hcd),
  85
  86         /*
  87          * generic hardware linkage
  88          */
  89         .irq                    = ehci_irq,
  90         .flags                  = HCD_MEMORY | HCD_USB2,
  91
  92         /*
  93          * basic lifecycle operations
  94          *
  95          * FIXME -- ehci_init() doesn't do enough here.
  96          * See ehci-ppc-soc for a complete implementation.
  97          */
  98         .reset                  = au1xxx_ehci_setup,
  99         .start                  = ehci_run,
 100         .stop                   = ehci_stop,
 101         .shutdown               = ehci_shutdown,
 102
 103         /*
 104          * managing i/o requests and associated device resources
 105          */
 106         .urb_enqueue            = ehci_urb_enqueue,
 107         .urb_dequeue            = ehci_urb_dequeue,
 108         .endpoint_disable       = ehci_endpoint_disable,
 109         .endpoint_reset         = ehci_endpoint_reset,
 110
 111         /*
 112          * scheduling support
 113          */
 114         .get_frame_number       = ehci_get_frame,
 115
 116         /*
 117          * root hub support
 118          */
 119         .hub_status_data        = ehci_hub_status_data,
 120         .hub_control            = ehci_hub_control,
 121         .bus_suspend            = ehci_bus_suspend,
 122         .bus_resume             = ehci_bus_resume,
 123         .relinquish_port        = ehci_relinquish_port,
 124         .port_handed_over       = ehci_port_handed_over,
 125
 126         .clear_tt_buffer_complete       = ehci_clear_tt_buffer_complete,
 127 };
 128
 129 static int ehci_hcd_au1xxx_drv_probe(struct platform_device *pdev)
 130 {
 131         struct usb_hcd *hcd;
 132         struct ehci_hcd *ehci;
 133         struct resource *res;
 134         int ret;
 135
 136         if (usb_disabled())
 137                 return -ENODEV;
 138
 139 #if defined(CONFIG_SOC_AU1200) && defined(CONFIG_DMA_COHERENT)
 140         /* Au1200 AB USB does not support coherent memory */
 141         if (!(read_c0_prid() & 0xff)) {
 142                 printk(KERN_INFO "%s: this is chip revision AB!\n", pdev->name);
 143                 printk(KERN_INFO "%s: update your board or re-configure"
 144                                  " the kernel\n", pdev->name);
 145                 return -ENODEV;
 146         }
 147 #endif
 148
 149         if (pdev->resource[1].flags != IORESOURCE_IRQ) {
 150                 pr_debug("resource[1] is not IORESOURCE_IRQ");
 151                 return -ENOMEM;
 152         }
 153         hcd = usb_create_hcd(&ehci_au1xxx_hc_driver, &pdev->dev, "Au1xxx");
 154         if (!hcd)
 155                 return -ENOMEM;
 156
 157         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 158         hcd->rsrc_start = res->start;
 159         hcd->rsrc_len = resource_size(res);
 160
 161         if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
 162                 pr_debug("request_mem_region failed");
 163                 ret = -EBUSY;
 164                 goto err1;
 165         }
 166
 167         hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
 168         if (!hcd->regs) {
 169                 pr_debug("ioremap failed");
 170                 ret = -ENOMEM;
 171                 goto err2;
 172         }
 173
 174         au1xxx_start_ehc();
 175
 176         ehci = hcd_to_ehci(hcd);
 177         ehci->caps = hcd->regs;
 178         ehci->regs = hcd->regs +
 179                 HC_LENGTH(ehci, readl(&ehci->caps->hc_capbase));
 180         /* cache this readonly data; minimize chip reads */
 181         ehci->hcs_params = readl(&ehci->caps->hcs_params);
 182
 183         ret = usb_add_hcd(hcd, pdev->resource[1].start,
 184                           IRQF_DISABLED | IRQF_SHARED);
 185         if (ret == 0) {
 186                 platform_set_drvdata(pdev, hcd);
 187                 return ret;
 188         }
 189
 190         au1xxx_stop_ehc();
 191         iounmap(hcd->regs);
 192 err2:
 193         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 194 err1:
 195         usb_put_hcd(hcd);
 196         return ret;
 197 }
 198
 199 static int ehci_hcd_au1xxx_drv_remove(struct platform_device *pdev)
 200 {
 201         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 202
 203         usb_remove_hcd(hcd);
 204         iounmap(hcd->regs);
 205         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 206         usb_put_hcd(hcd);
 207         au1xxx_stop_ehc();
 208         platform_set_drvdata(pdev, NULL);
 209
 210         return 0;
 211 }
 212
 213 #ifdef CONFIG_PM
 214 static int ehci_hcd_au1xxx_drv_suspend(struct device *dev)
 215 {
 216         struct usb_hcd *hcd = dev_get_drvdata(dev);
 217         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
 218         unsigned long flags;
 219         int rc = 0;
 220
 221         if (time_before(jiffies, ehci->next_statechange))
 222                 msleep(10);
 223
 224         /* Root hub was already suspended. Disable irq emission and
 225          * mark HW unaccessible.  The PM and USB cores make sure that
 226          * the root hub is either suspended or stopped.
 227          */
 228         ehci_prepare_ports_for_controller_suspend(ehci, device_may_wakeup(dev));
 229         spin_lock_irqsave(&ehci->lock, flags);
 230         ehci_writel(ehci, 0, &ehci->regs->intr_enable);
 231         (void)ehci_readl(ehci, &ehci->regs->intr_enable);
 232
 233         clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
 234         spin_unlock_irqrestore(&ehci->lock, flags);
 235
 236         // could save FLADJ in case of Vaux power loss
 237         // ... we'd only use it to handle clock skew
 238
 239         au1xxx_stop_ehc();
 240
 241         return rc;
 242 }
 243
 244 static int ehci_hcd_au1xxx_drv_resume(struct device *dev)
 245 {
 246         struct usb_hcd *hcd = dev_get_drvdata(dev);
 247         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
 248
 249         au1xxx_start_ehc();
 250
 251         // maybe restore FLADJ
 252
 253         if (time_before(jiffies, ehci->next_statechange))
 254                 msleep(100);
 255
 256         /* Mark hardware accessible again as we are out of D3 state by now */
 257         set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
 258
 259         /* If CF is still set, we maintained PCI Vaux power.
 260          * Just undo the effect of ehci_pci_suspend().
 261          */
 262         if (ehci_readl(ehci, &ehci->regs->configured_flag) == FLAG_CF) {
 263                 int     mask = INTR_MASK;
 264
 265                 ehci_prepare_ports_for_controller_resume(ehci);
 266                 if (!hcd->self.root_hub->do_remote_wakeup)
 267                         mask &= ~STS_PCD;
 268                 ehci_writel(ehci, mask, &ehci->regs->intr_enable);
 269                 ehci_readl(ehci, &ehci->regs->intr_enable);
 270                 return 0;
 271         }
 272
 273         ehci_dbg(ehci, "lost power, restarting\n");
 274         usb_root_hub_lost_power(hcd->self.root_hub);
 275
 276         /* Else reset, to cope with power loss or flush-to-storage
 277          * style "resume" having let BIOS kick in during reboot.
 278          */
 279         (void) ehci_halt(ehci);
 280         (void) ehci_reset(ehci);
 281
 282         /* emptying the schedule aborts any urbs */
 283         spin_lock_irq(&ehci->lock);
 284         if (ehci->reclaim)
 285                 end_unlink_async(ehci);
 286         ehci_work(ehci);
 287         spin_unlock_irq(&ehci->lock);
 288
 289         ehci_writel(ehci, ehci->command, &ehci->regs->command);
 290         ehci_writel(ehci, FLAG_CF, &ehci->regs->configured_flag);
 291         ehci_readl(ehci, &ehci->regs->command); /* unblock posted writes */
 292
 293         /* here we "know" root ports should always stay powered */
 294         ehci_port_power(ehci, 1);
 295
 296         ehci->rh_state = EHCI_RH_SUSPENDED;
 297
 298         return 0;
 299 }
 300
 301 static const struct dev_pm_ops au1xxx_ehci_pmops = {
 302         .suspend        = ehci_hcd_au1xxx_drv_suspend,
 303         .resume         = ehci_hcd_au1xxx_drv_resume,
 304 };
 305
 306 #define AU1XXX_EHCI_PMOPS &au1xxx_ehci_pmops
 307
 308 #else
 309 #define AU1XXX_EHCI_PMOPS NULL
 310 #endif
 311
 312 static struct platform_driver ehci_hcd_au1xxx_driver = {
 313         .probe          = ehci_hcd_au1xxx_drv_probe,
 314         .remove         = ehci_hcd_au1xxx_drv_remove,
 315         .shutdown       = usb_hcd_platform_shutdown,
 316         .driver = {
 317                 .name   = "au1xxx-ehci",
 318                 .owner  = THIS_MODULE,
 319                 .pm     = AU1XXX_EHCI_PMOPS,
 320         }
 321 };
 322
 323 MODULE_ALIAS("platform:au1xxx-ehci");