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         .clear_tt_buffer_complete       = ehci_clear_tt_buffer_complete,
 118 };
 119
 120 static int ehci_hcd_au1xxx_drv_probe(struct platform_device *pdev)
 121 {
 122         struct usb_hcd *hcd;
 123         struct ehci_hcd *ehci;
 124         int ret;
 125
 126         if (usb_disabled())
 127                 return -ENODEV;
 128
 129 #if defined(CONFIG_SOC_AU1200) && defined(CONFIG_DMA_COHERENT)
 130         /* Au1200 AB USB does not support coherent memory */
 131         if (!(read_c0_prid() & 0xff)) {
 132                 printk(KERN_INFO "%s: this is chip revision AB!\n", pdev->name);
 133                 printk(KERN_INFO "%s: update your board or re-configure"
 134                                  " the kernel\n", pdev->name);
 135                 return -ENODEV;
 136         }
 137 #endif
 138
 139         if (pdev->resource[1].flags != IORESOURCE_IRQ) {
 140                 pr_debug("resource[1] is not IORESOURCE_IRQ");
 141                 return -ENOMEM;
 142         }
 143         hcd = usb_create_hcd(&ehci_au1xxx_hc_driver, &pdev->dev, "Au1xxx");
 144         if (!hcd)
 145                 return -ENOMEM;
 146
 147         hcd->rsrc_start = pdev->resource[0].start;
 148         hcd->rsrc_len = pdev->resource[0].end - pdev->resource[0].start + 1;
 149
 150         if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
 151                 pr_debug("request_mem_region failed");
 152                 ret = -EBUSY;
 153                 goto err1;
 154         }
 155
 156         hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
 157         if (!hcd->regs) {
 158                 pr_debug("ioremap failed");
 159                 ret = -ENOMEM;
 160                 goto err2;
 161         }
 162
 163         au1xxx_start_ehc();
 164
 165         ehci = hcd_to_ehci(hcd);
 166         ehci->caps = hcd->regs;
 167         ehci->regs = hcd->regs + HC_LENGTH(readl(&ehci->caps->hc_capbase));
 168         /* cache this readonly data; minimize chip reads */
 169         ehci->hcs_params = readl(&ehci->caps->hcs_params);
 170
 171         ret = usb_add_hcd(hcd, pdev->resource[1].start,
 172                           IRQF_DISABLED | IRQF_SHARED);
 173         if (ret == 0) {
 174                 platform_set_drvdata(pdev, hcd);
 175                 return ret;
 176         }
 177
 178         au1xxx_stop_ehc();
 179         iounmap(hcd->regs);
 180 err2:
 181         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 182 err1:
 183         usb_put_hcd(hcd);
 184         return ret;
 185 }
 186
 187 static int ehci_hcd_au1xxx_drv_remove(struct platform_device *pdev)
 188 {
 189         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 190
 191         usb_remove_hcd(hcd);
 192         iounmap(hcd->regs);
 193         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 194         usb_put_hcd(hcd);
 195         au1xxx_stop_ehc();
 196         platform_set_drvdata(pdev, NULL);
 197
 198         return 0;
 199 }
 200
 201 #ifdef CONFIG_PM
 202 static int ehci_hcd_au1xxx_drv_suspend(struct platform_device *pdev,
 203                                         pm_message_t message)
 204 {
 205         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 206         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
 207         unsigned long flags;
 208         int rc;
 209
 210         return 0;
 211         rc = 0;
 212
 213         if (time_before(jiffies, ehci->next_statechange))
 214                 msleep(10);
 215
 216         /* Root hub was already suspended. Disable irq emission and
 217          * mark HW unaccessible, bail out if RH has been resumed. Use
 218          * the spinlock to properly synchronize with possible pending
 219          * RH suspend or resume activity.
 220          *
 221          * This is still racy as hcd->state is manipulated outside of
 222          * any locks =P But that will be a different fix.
 223          */
 224         spin_lock_irqsave(&ehci->lock, flags);
 225         if (hcd->state != HC_STATE_SUSPENDED) {
 226                 rc = -EINVAL;
 227                 goto bail;
 228         }
 229         ehci_writel(ehci, 0, &ehci->regs->intr_enable);
 230         (void)ehci_readl(ehci, &ehci->regs->intr_enable);
 231
 232         /* make sure snapshot being resumed re-enumerates everything */
 233         if (message.event == PM_EVENT_PRETHAW) {
 234                 ehci_halt(ehci);
 235                 ehci_reset(ehci);
 236         }
 237
 238         clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
 239
 240         au1xxx_stop_ehc();
 241
 242 bail:
 243         spin_unlock_irqrestore(&ehci->lock, flags);
 244
 245         // could save FLADJ in case of Vaux power loss
 246         // ... we'd only use it to handle clock skew
 247
 248         return rc;
 249 }
 250
 251
 252 static int ehci_hcd_au1xxx_drv_resume(struct platform_device *pdev)
 253 {
 254         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 255         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
 256
 257         au1xxx_start_ehc();
 258
 259         // maybe restore FLADJ
 260
 261         if (time_before(jiffies, ehci->next_statechange))
 262                 msleep(100);
 263
 264         /* Mark hardware accessible again as we are out of D3 state by now */
 265         set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
 266
 267         /* If CF is still set, we maintained PCI Vaux power.
 268          * Just undo the effect of ehci_pci_suspend().
 269          */
 270         if (ehci_readl(ehci, &ehci->regs->configured_flag) == FLAG_CF) {
 271                 int     mask = INTR_MASK;
 272
 273                 if (!hcd->self.root_hub->do_remote_wakeup)
 274                         mask &= ~STS_PCD;
 275                 ehci_writel(ehci, mask, &ehci->regs->intr_enable);
 276                 ehci_readl(ehci, &ehci->regs->intr_enable);
 277                 return 0;
 278         }
 279
 280         ehci_dbg(ehci, "lost power, restarting\n");
 281         usb_root_hub_lost_power(hcd->self.root_hub);
 282
 283         /* Else reset, to cope with power loss or flush-to-storage
 284          * style "resume" having let BIOS kick in during reboot.
 285          */
 286         (void) ehci_halt(ehci);
 287         (void) ehci_reset(ehci);
 288
 289         /* emptying the schedule aborts any urbs */
 290         spin_lock_irq(&ehci->lock);
 291         if (ehci->reclaim)
 292                 end_unlink_async(ehci);
 293         ehci_work(ehci);
 294         spin_unlock_irq(&ehci->lock);
 295
 296         ehci_writel(ehci, ehci->command, &ehci->regs->command);
 297         ehci_writel(ehci, FLAG_CF, &ehci->regs->configured_flag);
 298         ehci_readl(ehci, &ehci->regs->command); /* unblock posted writes */
 299
 300         /* here we "know" root ports should always stay powered */
 301         ehci_port_power(ehci, 1);
 302
 303         hcd->state = HC_STATE_SUSPENDED;
 304
 305         return 0;
 306 }
 307
 308 #else
 309 #define ehci_hcd_au1xxx_drv_suspend NULL
 310 #define ehci_hcd_au1xxx_drv_resume NULL
 311 #endif
 312
 313 static struct platform_driver ehci_hcd_au1xxx_driver = {
 314         .probe          = ehci_hcd_au1xxx_drv_probe,
 315         .remove         = ehci_hcd_au1xxx_drv_remove,
 316         .shutdown       = usb_hcd_platform_shutdown,
 317         .suspend        = ehci_hcd_au1xxx_drv_suspend,
 318         .resume         = ehci_hcd_au1xxx_drv_resume,
 319         .driver = {
 320                 .name   = "au1xxx-ehci",
 321                 .owner  = THIS_MODULE,
 322         }
 323 };
 324
 325 MODULE_ALIAS("platform:au1xxx-ehci");