drivers/usb/host/ehci-spear.c

   1 /*
   2 * Driver for EHCI HCD on SPEAR SOC
   3 *
   4 * Copyright (C) 2010 ST Micro Electronics,
   5 * Deepak Sikri <deepak.sikri@st.com>
   6 *
   7 * Based on various ehci-*.c drivers
   8 *
   9 * This file is subject to the terms and conditions of the GNU General Public
  10 * License. See the file COPYING in the main directory of this archive for
  11 * more details.
  12 */
  13
  14 #include <linux/platform_device.h>
  15 #include <linux/clk.h>
  16
  17 struct spear_ehci {
  18         struct ehci_hcd ehci;
  19         struct clk *clk;
  20 };
  21
  22 #define to_spear_ehci(hcd)      (struct spear_ehci *)hcd_to_ehci(hcd)
  23
  24 static void spear_start_ehci(struct spear_ehci *ehci)
  25 {
  26         clk_enable(ehci->clk);
  27 }
  28
  29 static void spear_stop_ehci(struct spear_ehci *ehci)
  30 {
  31         clk_disable(ehci->clk);
  32 }
  33
  34 static int ehci_spear_setup(struct usb_hcd *hcd)
  35 {
  36         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
  37         int retval = 0;
  38
  39         /* registers start at offset 0x0 */
  40         ehci->caps = hcd->regs;
  41         ehci->regs = hcd->regs + HC_LENGTH(ehci, ehci_readl(ehci,
  42                                 &ehci->caps->hc_capbase));
  43         /* cache this readonly data; minimize chip reads */
  44         ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params);
  45         retval = ehci_halt(ehci);
  46         if (retval)
  47                 return retval;
  48
  49         retval = ehci_init(hcd);
  50         if (retval)
  51                 return retval;
  52
  53         ehci_reset(ehci);
  54         ehci_port_power(ehci, 0);
  55
  56         return retval;
  57 }
  58
  59 static const struct hc_driver ehci_spear_hc_driver = {
  60         .description                    = hcd_name,
  61         .product_desc                   = "SPEAr EHCI",
  62         .hcd_priv_size                  = sizeof(struct spear_ehci),
  63
  64         /* generic hardware linkage */
  65         .irq                            = ehci_irq,
  66         .flags                          = HCD_MEMORY | HCD_USB2,
  67
  68         /* basic lifecycle operations */
  69         .reset                          = ehci_spear_setup,
  70         .start                          = ehci_run,
  71         .stop                           = ehci_stop,
  72         .shutdown                       = ehci_shutdown,
  73
  74         /* managing i/o requests and associated device resources */
  75         .urb_enqueue                    = ehci_urb_enqueue,
  76         .urb_dequeue                    = ehci_urb_dequeue,
  77         .endpoint_disable               = ehci_endpoint_disable,
  78         .endpoint_reset                 = ehci_endpoint_reset,
  79
  80         /* scheduling support */
  81         .get_frame_number               = ehci_get_frame,
  82
  83         /* root hub support */
  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         .clear_tt_buffer_complete       = ehci_clear_tt_buffer_complete,
  91 };
  92
  93 static int spear_ehci_hcd_drv_probe(struct platform_device *pdev)
  94 {
  95         struct usb_hcd *hcd ;
  96         struct spear_ehci *ehci;
  97         struct resource *res;
  98         struct clk *usbh_clk;
  99         const struct hc_driver *driver = &ehci_spear_hc_driver;
 100         int *pdata = pdev->dev.platform_data;
 101         int irq, retval;
 102         char clk_name[20] = "usbh_clk";
 103
 104         if (pdata == NULL)
 105                 return -EFAULT;
 106
 107         if (usb_disabled())
 108                 return -ENODEV;
 109
 110         irq = platform_get_irq(pdev, 0);
 111         if (irq < 0) {
 112                 retval = irq;
 113                 goto fail_irq_get;
 114         }
 115
 116         if (*pdata >= 0)
 117                 sprintf(clk_name, "usbh.%01d_clk", *pdata);
 118
 119         usbh_clk = clk_get(NULL, clk_name);
 120         if (IS_ERR(usbh_clk)) {
 121                 dev_err(&pdev->dev, "Error getting interface clock\n");
 122                 retval = PTR_ERR(usbh_clk);
 123                 goto fail_get_usbh_clk;
 124         }
 125
 126         hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev));
 127         if (!hcd) {
 128                 retval = -ENOMEM;
 129                 goto fail_create_hcd;
 130         }
 131
 132         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 133         if (!res) {
 134                 retval = -ENODEV;
 135                 goto fail_request_resource;
 136         }
 137
 138         hcd->rsrc_start = res->start;
 139         hcd->rsrc_len = resource_size(res);
 140         if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len,
 141                                 driver->description)) {
 142                 retval = -EBUSY;
 143                 goto fail_request_resource;
 144         }
 145
 146         hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
 147         if (hcd->regs == NULL) {
 148                 dev_dbg(&pdev->dev, "error mapping memory\n");
 149                 retval = -ENOMEM;
 150                 goto fail_ioremap;
 151         }
 152
 153         ehci = (struct spear_ehci *)hcd_to_ehci(hcd);
 154         ehci->clk = usbh_clk;
 155
 156         spear_start_ehci(ehci);
 157         retval = usb_add_hcd(hcd, irq, IRQF_SHARED | IRQF_DISABLED);
 158         if (retval)
 159                 goto fail_add_hcd;
 160
 161         return retval;
 162
 163 fail_add_hcd:
 164         spear_stop_ehci(ehci);
 165         iounmap(hcd->regs);
 166 fail_ioremap:
 167         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 168 fail_request_resource:
 169         usb_put_hcd(hcd);
 170 fail_create_hcd:
 171         clk_put(usbh_clk);
 172 fail_get_usbh_clk:
 173 fail_irq_get:
 174         dev_err(&pdev->dev, "init fail, %d\n", retval);
 175
 176         return retval ;
 177 }
 178
 179 static int spear_ehci_hcd_drv_remove(struct platform_device *pdev)
 180 {
 181         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 182         struct spear_ehci *ehci_p = to_spear_ehci(hcd);
 183
 184         if (!hcd)
 185                 return 0;
 186         if (in_interrupt())
 187                 BUG();
 188         usb_remove_hcd(hcd);
 189
 190         if (ehci_p->clk)
 191                 spear_stop_ehci(ehci_p);
 192         iounmap(hcd->regs);
 193         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 194         usb_put_hcd(hcd);
 195
 196         if (ehci_p->clk)
 197                 clk_put(ehci_p->clk);
 198
 199         return 0;
 200 }
 201
 202 static struct platform_driver spear_ehci_hcd_driver = {
 203         .probe          = spear_ehci_hcd_drv_probe,
 204         .remove         = spear_ehci_hcd_drv_remove,
 205         .shutdown       = usb_hcd_platform_shutdown,
 206         .driver         = {
 207                 .name = "spear-ehci",
 208                 .bus = &platform_bus_type
 209         }
 210 };
 211
 212 MODULE_ALIAS("platform:spear-ehci");