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         if (!res) {
  78                 retval = -ENODEV;
  79                 goto err_put_hcd;
  80         }
  81
  82         hcd->rsrc_start = pdev->resource[0].start;
  83         hcd->rsrc_len = resource_size(res);
  84         if (!devm_request_mem_region(&pdev->dev, hcd->rsrc_start, hcd->rsrc_len,
  85                                 hcd_name)) {
  86                 dev_dbg(&pdev->dev, "request_mem_region failed\n");
  87                 retval = -EBUSY;
  88                 goto err_put_hcd;
  89         }
  90
  91         hcd->regs = devm_ioremap(&pdev->dev, hcd->rsrc_start, hcd->rsrc_len);
  92         if (!hcd->regs) {
  93                 dev_dbg(&pdev->dev, "ioremap failed\n");
  94                 retval = -ENOMEM;
  95                 goto err_put_hcd;
  96         }
  97
  98         sohci_p = to_spear_ohci(hcd);
  99         sohci_p->clk = usbh_clk;
 100
 101         clk_prepare_enable(sohci_p->clk);
 102
 103         ohci = hcd_to_ohci(hcd);
 104
 105         retval = usb_add_hcd(hcd, platform_get_irq(pdev, 0), 0);
 106         if (retval == 0)
 107                 return retval;
 108
 109         clk_disable_unprepare(sohci_p->clk);
 110 err_put_hcd:
 111         usb_put_hcd(hcd);
 112 fail:
 113         dev_err(&pdev->dev, "init fail, %d\n", retval);
 114
 115         return retval;
 116 }
 117
 118 static int spear_ohci_hcd_drv_remove(struct platform_device *pdev)
 119 {
 120         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 121         struct spear_ohci *sohci_p = to_spear_ohci(hcd);
 122
 123         usb_remove_hcd(hcd);
 124         if (sohci_p->clk)
 125                 clk_disable_unprepare(sohci_p->clk);
 126
 127         usb_put_hcd(hcd);
 128         return 0;
 129 }
 130
 131 #if defined(CONFIG_PM)
 132 static int spear_ohci_hcd_drv_suspend(struct platform_device *dev,
 133                 pm_message_t message)
 134 {
 135         struct usb_hcd *hcd = platform_get_drvdata(dev);
 136         struct ohci_hcd *ohci = hcd_to_ohci(hcd);
 137         struct spear_ohci *sohci_p = to_spear_ohci(hcd);
 138
 139         if (time_before(jiffies, ohci->next_statechange))
 140                 msleep(5);
 141         ohci->next_statechange = jiffies;
 142
 143         clk_disable_unprepare(sohci_p->clk);
 144
 145         return 0;
 146 }
 147
 148 static int spear_ohci_hcd_drv_resume(struct platform_device *dev)
 149 {
 150         struct usb_hcd *hcd = platform_get_drvdata(dev);
 151         struct ohci_hcd *ohci = hcd_to_ohci(hcd);
 152         struct spear_ohci *sohci_p = to_spear_ohci(hcd);
 153
 154         if (time_before(jiffies, ohci->next_statechange))
 155                 msleep(5);
 156         ohci->next_statechange = jiffies;
 157
 158         clk_prepare_enable(sohci_p->clk);
 159         ohci_resume(hcd, false);
 160         return 0;
 161 }
 162 #endif
 163
 164 static struct of_device_id spear_ohci_id_table[] = {
 165         { .compatible = "st,spear600-ohci", },
 166         { },
 167 };
 168
 169 /* Driver definition to register with the platform bus */
 170 static struct platform_driver spear_ohci_hcd_driver = {
 171         .probe =        spear_ohci_hcd_drv_probe,
 172         .remove =       spear_ohci_hcd_drv_remove,
 173 #ifdef CONFIG_PM
 174         .suspend =      spear_ohci_hcd_drv_suspend,
 175         .resume =       spear_ohci_hcd_drv_resume,
 176 #endif
 177         .driver = {
 178                 .owner = THIS_MODULE,
 179                 .name = "spear-ohci",
 180                 .of_match_table = spear_ohci_id_table,
 181         },
 182 };
 183
 184 static const struct ohci_driver_overrides spear_overrides __initconst = {
 185         .extra_priv_size = sizeof(struct spear_ohci),
 186 };
 187 static int __init ohci_spear_init(void)
 188 {
 189         if (usb_disabled())
 190                 return -ENODEV;
 191
 192         pr_info("%s: " DRIVER_DESC "\n", hcd_name);
 193
 194         ohci_init_driver(&ohci_spear_hc_driver, &spear_overrides);
 195         return platform_driver_register(&spear_ohci_hcd_driver);
 196 }
 197 module_init(ohci_spear_init);
 198
 199 static void __exit ohci_spear_cleanup(void)
 200 {
 201         platform_driver_unregister(&spear_ohci_hcd_driver);
 202 }
 203 module_exit(ohci_spear_cleanup);
 204
 205 MODULE_DESCRIPTION(DRIVER_DESC);
 206 MODULE_AUTHOR("Deepak Sikri");
 207 MODULE_LICENSE("GPL v2");
 208 MODULE_ALIAS("platform:spear-ohci");