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 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
  81static 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
 129static 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);
 192err2:
 193        release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 194err1:
 195        usb_put_hcd(hcd);
 196        return ret;
 197}
 198
 199static 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
 214static 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
 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                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        hcd->state = HC_STATE_SUSPENDED;
 297
 298        return 0;
 299}
 300
 301static 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
 312static 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
 323MODULE_ALIAS("platform:au1xxx-ehci");
 324