drivers/usb/host/ehci-sead3.c

   1 /*
   2  * MIPS CI13320A EHCI Host Controller driver
   3  * Based on "ehci-au1xxx.c" by K.Boge <karsten.boge@amd.com>
   4  *
   5  * Copyright (C) 2012 MIPS Technologies, Inc.
   6  *
   7  * This program is free software; you can redistribute it and/or modify it
   8  * under the terms of the GNU General Public License as published by the
   9  * Free Software Foundation; either version 2 of the License, or (at your
  10  * option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  14  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  15  * for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software Foundation,
  19  * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20  */
  21
  22 #include <linux/platform_device.h>
  23
  24 static int ehci_sead3_setup(struct usb_hcd *hcd)
  25 {
  26         int ret;
  27         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
  28
  29         ehci->caps = hcd->regs + 0x100;
  30
  31 #ifdef __BIG_ENDIAN
  32         ehci->big_endian_mmio = 1;
  33         ehci->big_endian_desc = 1;
  34 #endif
  35
  36         ret = ehci_setup(hcd);
  37         if (ret)
  38                 return ret;
  39
  40         ehci->need_io_watchdog = 0;
  41
  42         /* Set burst length to 16 words. */
  43         ehci_writel(ehci, 0x1010, &ehci->regs->reserved[1]);
  44
  45         return ret;
  46 }
  47
  48 const struct hc_driver ehci_sead3_hc_driver = {
  49         .description            = hcd_name,
  50         .product_desc           = "SEAD-3 EHCI",
  51         .hcd_priv_size          = sizeof(struct ehci_hcd),
  52
  53         /*
  54          * generic hardware linkage
  55          */
  56         .irq                    = ehci_irq,
  57         .flags                  = HCD_MEMORY | HCD_USB2,
  58
  59         /*
  60          * basic lifecycle operations
  61          *
  62          */
  63         .reset                  = ehci_sead3_setup,
  64         .start                  = ehci_run,
  65         .stop                   = ehci_stop,
  66         .shutdown               = ehci_shutdown,
  67
  68         /*
  69          * managing i/o requests and associated device resources
  70          */
  71         .urb_enqueue            = ehci_urb_enqueue,
  72         .urb_dequeue            = ehci_urb_dequeue,
  73         .endpoint_disable       = ehci_endpoint_disable,
  74         .endpoint_reset         = ehci_endpoint_reset,
  75
  76         /*
  77          * scheduling support
  78          */
  79         .get_frame_number       = ehci_get_frame,
  80
  81         /*
  82          * root hub support
  83          */
  84         .hub_status_data        = ehci_hub_status_data,
  85         .hub_control            = ehci_hub_control,
  86         .bus_suspend            = ehci_bus_suspend,
  87         .bus_resume             = ehci_bus_resume,
  88         .relinquish_port        = ehci_relinquish_port,
  89         .port_handed_over       = ehci_port_handed_over,
  90
  91         .clear_tt_buffer_complete       = ehci_clear_tt_buffer_complete,
  92 };
  93
  94 static int ehci_hcd_sead3_drv_probe(struct platform_device *pdev)
  95 {
  96         struct usb_hcd *hcd;
  97         struct resource *res;
  98         int ret;
  99
 100         if (usb_disabled())
 101                 return -ENODEV;
 102
 103         if (pdev->resource[1].flags != IORESOURCE_IRQ) {
 104                 pr_debug("resource[1] is not IORESOURCE_IRQ");
 105                 return -ENOMEM;
 106         }
 107         hcd = usb_create_hcd(&ehci_sead3_hc_driver, &pdev->dev, "SEAD-3");
 108         if (!hcd)
 109                 return -ENOMEM;
 110
 111         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 112         hcd->rsrc_start = res->start;
 113         hcd->rsrc_len = resource_size(res);
 114
 115         if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
 116                 pr_debug("request_mem_region failed");
 117                 ret = -EBUSY;
 118                 goto err1;
 119         }
 120
 121         hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
 122         if (!hcd->regs) {
 123                 pr_debug("ioremap failed");
 124                 ret = -ENOMEM;
 125                 goto err2;
 126         }
 127
 128         /* Root hub has integrated TT. */
 129         hcd->has_tt = 1;
 130
 131         ret = usb_add_hcd(hcd, pdev->resource[1].start,
 132                           IRQF_SHARED);
 133         if (ret == 0) {
 134                 platform_set_drvdata(pdev, hcd);
 135                 return ret;
 136         }
 137
 138         iounmap(hcd->regs);
 139 err2:
 140         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 141 err1:
 142         usb_put_hcd(hcd);
 143         return ret;
 144 }
 145
 146 static int ehci_hcd_sead3_drv_remove(struct platform_device *pdev)
 147 {
 148         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 149
 150         usb_remove_hcd(hcd);
 151         iounmap(hcd->regs);
 152         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 153         usb_put_hcd(hcd);
 154         platform_set_drvdata(pdev, NULL);
 155
 156         return 0;
 157 }
 158
 159 #ifdef CONFIG_PM
 160 static int ehci_hcd_sead3_drv_suspend(struct device *dev)
 161 {
 162         struct usb_hcd *hcd = dev_get_drvdata(dev);
 163         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
 164         unsigned long flags;
 165         int rc = 0;
 166
 167         if (time_before(jiffies, ehci->next_statechange))
 168                 msleep(20);
 169
 170         /* Root hub was already suspended. Disable irq emission and
 171          * mark HW unaccessible.  The PM and USB cores make sure that
 172          * the root hub is either suspended or stopped.
 173          */
 174         ehci_prepare_ports_for_controller_suspend(ehci, device_may_wakeup(dev));
 175         spin_lock_irqsave(&ehci->lock, flags);
 176         ehci_writel(ehci, 0, &ehci->regs->intr_enable);
 177         (void)ehci_readl(ehci, &ehci->regs->intr_enable);
 178
 179         clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
 180         spin_unlock_irqrestore(&ehci->lock, flags);
 181
 182         /* could save FLADJ in case of Vaux power loss
 183          * ... we'd only use it to handle clock skew
 184          */
 185
 186         return rc;
 187 }
 188
 189 static int ehci_hcd_sead3_drv_resume(struct device *dev)
 190 {
 191         struct usb_hcd *hcd = dev_get_drvdata(dev);
 192         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
 193
 194         /* maybe restore FLADJ. */
 195
 196         if (time_before(jiffies, ehci->next_statechange))
 197                 msleep(100);
 198
 199         /* Mark hardware accessible again as we are out of D3 state by now */
 200         set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
 201
 202         /* If CF is still set, we maintained PCI Vaux power.
 203          * Just undo the effect of ehci_pci_suspend().
 204          */
 205         if (ehci_readl(ehci, &ehci->regs->configured_flag) == FLAG_CF) {
 206                 int     mask = INTR_MASK;
 207
 208                 ehci_prepare_ports_for_controller_resume(ehci);
 209                 if (!hcd->self.root_hub->do_remote_wakeup)
 210                         mask &= ~STS_PCD;
 211                 ehci_writel(ehci, mask, &ehci->regs->intr_enable);
 212                 ehci_readl(ehci, &ehci->regs->intr_enable);
 213                 return 0;
 214         }
 215
 216         ehci_dbg(ehci, "lost power, restarting\n");
 217         usb_root_hub_lost_power(hcd->self.root_hub);
 218
 219         /* Else reset, to cope with power loss or flush-to-storage
 220          * style "resume" having let BIOS kick in during reboot.
 221          */
 222         (void) ehci_halt(ehci);
 223         (void) ehci_reset(ehci);
 224
 225         /* emptying the schedule aborts any urbs */
 226         spin_lock_irq(&ehci->lock);
 227         if (ehci->reclaim)
 228                 end_unlink_async(ehci);
 229         ehci_work(ehci);
 230         spin_unlock_irq(&ehci->lock);
 231
 232         ehci_writel(ehci, ehci->command, &ehci->regs->command);
 233         ehci_writel(ehci, FLAG_CF, &ehci->regs->configured_flag);
 234         ehci_readl(ehci, &ehci->regs->command); /* unblock posted writes */
 235
 236         /* here we "know" root ports should always stay powered */
 237         ehci_port_power(ehci, 1);
 238
 239         ehci->rh_state = EHCI_RH_SUSPENDED;
 240
 241         return 0;
 242 }
 243
 244 static const struct dev_pm_ops sead3_ehci_pmops = {
 245         .suspend        = ehci_hcd_sead3_drv_suspend,
 246         .resume         = ehci_hcd_sead3_drv_resume,
 247 };
 248
 249 #define SEAD3_EHCI_PMOPS (&sead3_ehci_pmops)
 250
 251 #else
 252 #define SEAD3_EHCI_PMOPS NULL
 253 #endif
 254
 255 static struct platform_driver ehci_hcd_sead3_driver = {
 256         .probe          = ehci_hcd_sead3_drv_probe,
 257         .remove         = ehci_hcd_sead3_drv_remove,
 258         .shutdown       = usb_hcd_platform_shutdown,
 259         .driver = {
 260                 .name   = "sead3-ehci",
 261                 .owner  = THIS_MODULE,
 262                 .pm     = SEAD3_EHCI_PMOPS,
 263         }
 264 };
 265
 266 MODULE_ALIAS("platform:sead3-ehci");