kernel/drivers/usb/host/ohci-spear.c

   1 /*
   2 * OHCI HCD (Host Controller Driver) for USB.
   3 *
   4 * Copyright (C) 2010 ST Microelectronics.
   5 * Deepak Sikri<deepak.sikri@st.com>
   6 *
   7 * Based on various ohci-*.c drivers
   8 *
   9 * This file is licensed under the terms of the GNU General Public
  10 * License version 2. This program is licensed "as is" without any
  11 * warranty of any kind, whether express or implied.
  12 */
  13
  14 #include <linux/clk.h>
  15 #include <linux/dma-mapping.h>
  16 #include <linux/io.h>
  17 #include <linux/kernel.h>
  18 #include <linux/module.h>
  19 #include <linux/of.h>
  20 #include <linux/platform_device.h>
  21 #include <linux/signal.h>
  22 #include <linux/usb.h>
  23 #include <linux/usb/hcd.h>
  24
  25 #include "ohci.h"
  26
  27 #define DRIVER_DESC "OHCI SPEAr driver"
  28
  29 static const char hcd_name[] = "SPEAr-ohci";
  30 struct spear_ohci {
  31         struct clk *clk;
  32 };
  33
  34 #define to_spear_ohci(hcd)     (struct spear_ohci *)(hcd_to_ohci(hcd)->priv)
  35
  36 static struct hc_driver __read_mostly ohci_spear_hc_driver;
  37
  38 static int spear_ohci_hcd_drv_probe(struct platform_device *pdev)
  39 {
  40         const struct hc_driver *driver = &ohci_spear_hc_driver;
  41         struct ohci_hcd *ohci;
  42         struct usb_hcd *hcd = NULL;
  43         struct clk *usbh_clk;
  44         struct spear_ohci *sohci_p;
  45         struct resource *res;
  46         int retval, irq;
  47
  48         irq = platform_get_irq(pdev, 0);
  49         if (irq < 0) {
  50                 retval = irq;
  51                 goto fail;
  52         }
  53
  54         /*
  55          * Right now device-tree probed devices don't get dma_mask set.
  56          * Since shared usb code relies on it, set it here for now.
  57          * Once we have dma capability bindings this can go away.
  58          */
  59         retval = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
  60         if (retval)
  61                 goto fail;
  62
  63         usbh_clk = devm_clk_get(&pdev->dev, NULL);
  64         if (IS_ERR(usbh_clk)) {
  65                 dev_err(&pdev->dev, "Error getting interface clock\n");
  66                 retval = PTR_ERR(usbh_clk);
  67                 goto fail;
  68         }
  69
  70         hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev));
  71         if (!hcd) {
  72                 retval = -ENOMEM;
  73                 goto fail;
  74         }
  75
  76         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  77         hcd->regs = devm_ioremap_resource(&pdev->dev, res);
  78         if (IS_ERR(hcd->regs)) {
  79                 retval = PTR_ERR(hcd->regs);
  80                 goto err_put_hcd;
  81         }
  82
  83         hcd->rsrc_start = pdev->resource[0].start;
  84         hcd->rsrc_len = resource_size(res);
  85
  86         sohci_p = to_spear_ohci(hcd);
  87         sohci_p->clk = usbh_clk;
  88
  89         clk_prepare_enable(sohci_p->clk);
  90
  91         ohci = hcd_to_ohci(hcd);
  92
  93         retval = usb_add_hcd(hcd, platform_get_irq(pdev, 0), 0);
  94         if (retval == 0) {
  95                 device_wakeup_enable(hcd->self.controller);
  96                 return retval;
  97         }
  98
  99         clk_disable_unprepare(sohci_p->clk);
 100 err_put_hcd:
 101         usb_put_hcd(hcd);
 102 fail:
 103         dev_err(&pdev->dev, "init fail, %d\n", retval);
 104
 105         return retval;
 106 }
 107
 108 static int spear_ohci_hcd_drv_remove(struct platform_device *pdev)
 109 {
 110         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 111         struct spear_ohci *sohci_p = to_spear_ohci(hcd);
 112
 113         usb_remove_hcd(hcd);
 114         if (sohci_p->clk)
 115                 clk_disable_unprepare(sohci_p->clk);
 116
 117         usb_put_hcd(hcd);
 118         return 0;
 119 }
 120
 121 #if defined(CONFIG_PM)
 122 static int spear_ohci_hcd_drv_suspend(struct platform_device *pdev,
 123                 pm_message_t message)
 124 {
 125         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 126         struct ohci_hcd *ohci = hcd_to_ohci(hcd);
 127         struct spear_ohci *sohci_p = to_spear_ohci(hcd);
 128         bool do_wakeup = device_may_wakeup(&pdev->dev);
 129         int ret;
 130
 131         if (time_before(jiffies, ohci->next_statechange))
 132                 msleep(5);
 133         ohci->next_statechange = jiffies;
 134
 135         ret = ohci_suspend(hcd, do_wakeup);
 136         if (ret)
 137                 return ret;
 138
 139         clk_disable_unprepare(sohci_p->clk);
 140
 141         return ret;
 142 }
 143
 144 static int spear_ohci_hcd_drv_resume(struct platform_device *dev)
 145 {
 146         struct usb_hcd *hcd = platform_get_drvdata(dev);
 147         struct ohci_hcd *ohci = hcd_to_ohci(hcd);
 148         struct spear_ohci *sohci_p = to_spear_ohci(hcd);
 149
 150         if (time_before(jiffies, ohci->next_statechange))
 151                 msleep(5);
 152         ohci->next_statechange = jiffies;
 153
 154         clk_prepare_enable(sohci_p->clk);
 155         ohci_resume(hcd, false);
 156         return 0;
 157 }
 158 #endif
 159
 160 static const struct of_device_id spear_ohci_id_table[] = {
 161         { .compatible = "st,spear600-ohci", },
 162         { },
 163 };
 164
 165 /* Driver definition to register with the platform bus */
 166 static struct platform_driver spear_ohci_hcd_driver = {
 167         .probe =        spear_ohci_hcd_drv_probe,
 168         .remove =       spear_ohci_hcd_drv_remove,
 169 #ifdef CONFIG_PM
 170         .suspend =      spear_ohci_hcd_drv_suspend,
 171         .resume =       spear_ohci_hcd_drv_resume,
 172 #endif
 173         .driver = {
 174                 .name = "spear-ohci",
 175                 .of_match_table = spear_ohci_id_table,
 176         },
 177 };
 178
 179 static const struct ohci_driver_overrides spear_overrides __initconst = {
 180         .extra_priv_size = sizeof(struct spear_ohci),
 181 };
 182 static int __init ohci_spear_init(void)
 183 {
 184         if (usb_disabled())
 185                 return -ENODEV;
 186
 187         pr_info("%s: " DRIVER_DESC "\n", hcd_name);
 188
 189         ohci_init_driver(&ohci_spear_hc_driver, &spear_overrides);
 190         return platform_driver_register(&spear_ohci_hcd_driver);
 191 }
 192 module_init(ohci_spear_init);
 193
 194 static void __exit ohci_spear_cleanup(void)
 195 {
 196         platform_driver_unregister(&spear_ohci_hcd_driver);
 197 }
 198 module_exit(ohci_spear_cleanup);
 199
 200 MODULE_DESCRIPTION(DRIVER_DESC);
 201 MODULE_AUTHOR("Deepak Sikri");
 202 MODULE_LICENSE("GPL v2");
 203 MODULE_ALIAS("platform:spear-ohci");