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         if (!pdev->dev.dma_mask)
  60                 pdev->dev.dma_mask = &pdev->dev.coherent_dma_mask;
  61         if (!pdev->dev.coherent_dma_mask)
  62                 pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
  63
  64         usbh_clk = devm_clk_get(&pdev->dev, NULL);
  65         if (IS_ERR(usbh_clk)) {
  66                 dev_err(&pdev->dev, "Error getting interface clock\n");
  67                 retval = PTR_ERR(usbh_clk);
  68                 goto fail;
  69         }
  70
  71         hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev));
  72         if (!hcd) {
  73                 retval = -ENOMEM;
  74                 goto fail;
  75         }
  76
  77         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  78         if (!res) {
  79                 retval = -ENODEV;
  80                 goto err_put_hcd;
  81         }
  82
  83         hcd->rsrc_start = pdev->resource[0].start;
  84         hcd->rsrc_len = resource_size(res);
  85         if (!devm_request_mem_region(&pdev->dev, hcd->rsrc_start, hcd->rsrc_len,
  86                                 hcd_name)) {
  87                 dev_dbg(&pdev->dev, "request_mem_region failed\n");
  88                 retval = -EBUSY;
  89                 goto err_put_hcd;
  90         }
  91
  92         hcd->regs = devm_ioremap(&pdev->dev, hcd->rsrc_start, hcd->rsrc_len);
  93         if (!hcd->regs) {
  94                 dev_dbg(&pdev->dev, "ioremap failed\n");
  95                 retval = -ENOMEM;
  96                 goto err_put_hcd;
  97         }
  98
  99         sohci_p = to_spear_ohci(hcd);
 100         sohci_p->clk = usbh_clk;
 101
 102         clk_prepare_enable(sohci_p->clk);
 103
 104         ohci = hcd_to_ohci(hcd);
 105
 106         retval = usb_add_hcd(hcd, platform_get_irq(pdev, 0), 0);
 107         if (retval == 0)
 108                 return retval;
 109
 110         clk_disable_unprepare(sohci_p->clk);
 111 err_put_hcd:
 112         usb_put_hcd(hcd);
 113 fail:
 114         dev_err(&pdev->dev, "init fail, %d\n", retval);
 115
 116         return retval;
 117 }
 118
 119 static int spear_ohci_hcd_drv_remove(struct platform_device *pdev)
 120 {
 121         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 122         struct spear_ohci *sohci_p = to_spear_ohci(hcd);
 123
 124         usb_remove_hcd(hcd);
 125         if (sohci_p->clk)
 126                 clk_disable_unprepare(sohci_p->clk);
 127
 128         usb_put_hcd(hcd);
 129         return 0;
 130 }
 131
 132 #if defined(CONFIG_PM)
 133 static int spear_ohci_hcd_drv_suspend(struct platform_device *dev,
 134                 pm_message_t message)
 135 {
 136         struct usb_hcd *hcd = platform_get_drvdata(dev);
 137         struct ohci_hcd *ohci = hcd_to_ohci(hcd);
 138         struct spear_ohci *sohci_p = to_spear_ohci(hcd);
 139
 140         if (time_before(jiffies, ohci->next_statechange))
 141                 msleep(5);
 142         ohci->next_statechange = jiffies;
 143
 144         clk_disable_unprepare(sohci_p->clk);
 145
 146         return 0;
 147 }
 148
 149 static int spear_ohci_hcd_drv_resume(struct platform_device *dev)
 150 {
 151         struct usb_hcd *hcd = platform_get_drvdata(dev);
 152         struct ohci_hcd *ohci = hcd_to_ohci(hcd);
 153         struct spear_ohci *sohci_p = to_spear_ohci(hcd);
 154
 155         if (time_before(jiffies, ohci->next_statechange))
 156                 msleep(5);
 157         ohci->next_statechange = jiffies;
 158
 159         clk_prepare_enable(sohci_p->clk);
 160         ohci_resume(hcd, false);
 161         return 0;
 162 }
 163 #endif
 164
 165 static struct of_device_id spear_ohci_id_table[] = {
 166         { .compatible = "st,spear600-ohci", },
 167         { },
 168 };
 169
 170 /* Driver definition to register with the platform bus */
 171 static struct platform_driver spear_ohci_hcd_driver = {
 172         .probe =        spear_ohci_hcd_drv_probe,
 173         .remove =       spear_ohci_hcd_drv_remove,
 174 #ifdef CONFIG_PM
 175         .suspend =      spear_ohci_hcd_drv_suspend,
 176         .resume =       spear_ohci_hcd_drv_resume,
 177 #endif
 178         .driver = {
 179                 .owner = THIS_MODULE,
 180                 .name = "spear-ohci",
 181                 .of_match_table = spear_ohci_id_table,
 182         },
 183 };
 184
 185 static const struct ohci_driver_overrides spear_overrides __initconst = {
 186         .extra_priv_size = sizeof(struct spear_ohci),
 187 };
 188 static int __init ohci_spear_init(void)
 189 {
 190         if (usb_disabled())
 191                 return -ENODEV;
 192
 193         pr_info("%s: " DRIVER_DESC "\n", hcd_name);
 194
 195         ohci_init_driver(&ohci_spear_hc_driver, &spear_overrides);
 196         return platform_driver_register(&spear_ohci_hcd_driver);
 197 }
 198 module_init(ohci_spear_init);
 199
 200 static void __exit ohci_spear_cleanup(void)
 201 {
 202         platform_driver_unregister(&spear_ohci_hcd_driver);
 203 }
 204 module_exit(ohci_spear_cleanup);
 205
 206 MODULE_DESCRIPTION(DRIVER_DESC);
 207 MODULE_AUTHOR("Deepak Sikri");
 208 MODULE_LICENSE("GPL v2");
 209 MODULE_ALIAS("platform:spear-ohci");