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->reserved1[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         bool do_wakeup = device_may_wakeup(dev);
 164
 165         return ehci_suspend(hcd, do_wakeup);
 166 }
 167
 168 static int ehci_hcd_sead3_drv_resume(struct device *dev)
 169 {
 170         struct usb_hcd *hcd = dev_get_drvdata(dev);
 171
 172         ehci_resume(hcd, false);
 173         return 0;
 174 }
 175
 176 static const struct dev_pm_ops sead3_ehci_pmops = {
 177         .suspend        = ehci_hcd_sead3_drv_suspend,
 178         .resume         = ehci_hcd_sead3_drv_resume,
 179 };
 180
 181 #define SEAD3_EHCI_PMOPS (&sead3_ehci_pmops)
 182
 183 #else
 184 #define SEAD3_EHCI_PMOPS NULL
 185 #endif
 186
 187 static struct platform_driver ehci_hcd_sead3_driver = {
 188         .probe          = ehci_hcd_sead3_drv_probe,
 189         .remove         = ehci_hcd_sead3_drv_remove,
 190         .shutdown       = usb_hcd_platform_shutdown,
 191         .driver = {
 192                 .name   = "sead3-ehci",
 193                 .owner  = THIS_MODULE,
 194                 .pm     = SEAD3_EHCI_PMOPS,
 195         }
 196 };
 197
 198 MODULE_ALIAS("platform:sead3-ehci");