LXR linux/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
  40extern int usb_disabled(void);
  41
  42static 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
  55static 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
  72static 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
 120static 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);
 180err2:
 181        release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 182err1:
 183        usb_put_hcd(hcd);
 184        return ret;
 185}
 186
 187static 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
 202static int ehci_hcd_au1xxx_drv_suspend(struct device *dev)
 203{
 204        struct usb_hcd *hcd = dev_get_drvdata(dev);
 205        struct ehci_hcd *ehci = hcd_to_ehci(hcd);
 206        unsigned long flags;
 207        int rc;
 208
 209        return 0;
 210        rc = 0;
 211
 212        if (time_before(jiffies, ehci->next_statechange))
 213                msleep(10);
 214
 215        /* Root hub was already suspended. Disable irq emission and
 216         * mark HW unaccessible, bail out if RH has been resumed. Use
 217         * the spinlock to properly synchronize with possible pending
 218         * RH suspend or resume activity.
 219         *
 220         * This is still racy as hcd->state is manipulated outside of
 221         * any locks =P But that will be a different fix.
 222         */
 223        spin_lock_irqsave(&ehci->lock, flags);
 224        if (hcd->state != HC_STATE_SUSPENDED) {
 225                rc = -EINVAL;
 226                goto bail;
 227        }
 228        ehci_writel(ehci, 0, &ehci->regs->intr_enable);
 229        (void)ehci_readl(ehci, &ehci->regs->intr_enable);
 230
 231        clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
 232
 233        au1xxx_stop_ehc();
 234
 235bail:
 236        spin_unlock_irqrestore(&ehci->lock, flags);
 237
 238        // could save FLADJ in case of Vaux power loss
 239        // ... we'd only use it to handle clock skew
 240
 241        return rc;
 242}
 243
 244static 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                if (!hcd->self.root_hub->do_remote_wakeup)
 266                        mask &= ~STS_PCD;
 267                ehci_writel(ehci, mask, &ehci->regs->intr_enable);
 268                ehci_readl(ehci, &ehci->regs->intr_enable);
 269                return 0;
 270        }
 271
 272        ehci_dbg(ehci, "lost power, restarting\n");
 273        usb_root_hub_lost_power(hcd->self.root_hub);
 274
 275        /* Else reset, to cope with power loss or flush-to-storage
 276         * style "resume" having let BIOS kick in during reboot.
 277         */
 278        (void) ehci_halt(ehci);
 279        (void) ehci_reset(ehci);
 280
 281        /* emptying the schedule aborts any urbs */
 282        spin_lock_irq(&ehci->lock);
 283        if (ehci->reclaim)
 284                end_unlink_async(ehci);
 285        ehci_work(ehci);
 286        spin_unlock_irq(&ehci->lock);
 287
 288        ehci_writel(ehci, ehci->command, &ehci->regs->command);
 289        ehci_writel(ehci, FLAG_CF, &ehci->regs->configured_flag);
 290        ehci_readl(ehci, &ehci->regs->command); /* unblock posted writes */
 291
 292        /* here we "know" root ports should always stay powered */
 293        ehci_port_power(ehci, 1);
 294
 295        hcd->state = HC_STATE_SUSPENDED;
 296
 297        return 0;
 298}
 299
 300static struct dev_pm_ops au1xxx_ehci_pmops = {
 301        .suspend        = ehci_hcd_au1xxx_drv_suspend,
 302        .resume         = ehci_hcd_au1xxx_drv_resume,
 303};
 304
 305#define AU1XXX_EHCI_PMOPS &au1xxx_ehci_pmops
 306
 307#else
 308#define AU1XXX_EHCI_PMOPS NULL
 309#endif
 310
 311static 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        .driver = {
 316                .name   = "au1xxx-ehci",
 317                .owner  = THIS_MODULE,
 318                .pm     = AU1XXX_EHCI_PMOPS,
 319        }
 320};
 321
 322MODULE_ALIAS("platform:au1xxx-ehci");
 323