drivers/usb/host/xhci-plat.c

   1 /*
   2  * xhci-plat.c - xHCI host controller driver platform Bus Glue.
   3  *
   4  * Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com
   5  * Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
   6  *
   7  * A lot of code borrowed from the Linux xHCI driver.
   8  *
   9  * This program is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU General Public License
  11  * version 2 as published by the Free Software Foundation.
  12  */
  13
  14 #include <linux/clk.h>
  15 #include <linux/dma-mapping.h>
  16 #include <linux/module.h>
  17 #include <linux/of.h>
  18 #include <linux/platform_device.h>
  19 #include <linux/slab.h>
  20
  21 #include "xhci.h"
  22 #include "xhci-mvebu.h"
  23
  24 static void xhci_plat_quirks(struct device *dev, struct xhci_hcd *xhci)
  25 {
  26         /*
  27          * As of now platform drivers don't provide MSI support so we ensure
  28          * here that the generic code does not try to make a pci_dev from our
  29          * dev struct in order to setup MSI
  30          */
  31         xhci->quirks |= XHCI_PLAT;
  32 }
  33
  34 /* called during probe() after chip reset completes */
  35 static int xhci_plat_setup(struct usb_hcd *hcd)
  36 {
  37         return xhci_gen_setup(hcd, xhci_plat_quirks);
  38 }
  39
  40 static const struct hc_driver xhci_plat_xhci_driver = {
  41         .description =          "xhci-hcd",
  42         .product_desc =         "xHCI Host Controller",
  43         .hcd_priv_size =        sizeof(struct xhci_hcd *),
  44
  45         /*
  46          * generic hardware linkage
  47          */
  48         .irq =                  xhci_irq,
  49         .flags =                HCD_MEMORY | HCD_USB3 | HCD_SHARED,
  50
  51         /*
  52          * basic lifecycle operations
  53          */
  54         .reset =                xhci_plat_setup,
  55         .start =                xhci_run,
  56         .stop =                 xhci_stop,
  57         .shutdown =             xhci_shutdown,
  58
  59         /*
  60          * managing i/o requests and associated device resources
  61          */
  62         .urb_enqueue =          xhci_urb_enqueue,
  63         .urb_dequeue =          xhci_urb_dequeue,
  64         .alloc_dev =            xhci_alloc_dev,
  65         .free_dev =             xhci_free_dev,
  66         .alloc_streams =        xhci_alloc_streams,
  67         .free_streams =         xhci_free_streams,
  68         .add_endpoint =         xhci_add_endpoint,
  69         .drop_endpoint =        xhci_drop_endpoint,
  70         .endpoint_reset =       xhci_endpoint_reset,
  71         .check_bandwidth =      xhci_check_bandwidth,
  72         .reset_bandwidth =      xhci_reset_bandwidth,
  73         .address_device =       xhci_address_device,
  74         .enable_device =        xhci_enable_device,
  75         .update_hub_device =    xhci_update_hub_device,
  76         .reset_device =         xhci_discover_or_reset_device,
  77
  78         /*
  79          * scheduling support
  80          */
  81         .get_frame_number =     xhci_get_frame,
  82
  83         /* Root hub support */
  84         .hub_control =          xhci_hub_control,
  85         .hub_status_data =      xhci_hub_status_data,
  86         .bus_suspend =          xhci_bus_suspend,
  87         .bus_resume =           xhci_bus_resume,
  88 };
  89
  90 static int xhci_plat_probe(struct platform_device *pdev)
  91 {
  92         const struct hc_driver  *driver;
  93         struct xhci_hcd         *xhci;
  94         struct resource         *res;
  95         struct usb_hcd          *hcd;
  96         struct clk              *clk;
  97         int                     ret;
  98         int                     irq;
  99
 100         if (usb_disabled())
 101                 return -ENODEV;
 102
 103         driver = &xhci_plat_xhci_driver;
 104
 105         irq = platform_get_irq(pdev, 0);
 106         if (irq < 0)
 107                 return -ENODEV;
 108
 109         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 110         if (!res)
 111                 return -ENODEV;
 112
 113         if (of_device_is_compatible(pdev->dev.of_node,
 114                                     "marvell,armada-375-xhci") ||
 115             of_device_is_compatible(pdev->dev.of_node,
 116                                     "marvell,armada-380-xhci")) {
 117                 ret = xhci_mvebu_mbus_init_quirk(pdev);
 118                 if (ret)
 119                         return ret;
 120         }
 121
 122         /* Initialize dma_mask and coherent_dma_mask to 32-bits */
 123         ret = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32));
 124         if (ret)
 125                 return ret;
 126         if (!pdev->dev.dma_mask)
 127                 pdev->dev.dma_mask = &pdev->dev.coherent_dma_mask;
 128         else
 129                 dma_set_mask(&pdev->dev, DMA_BIT_MASK(32));
 130
 131         hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev));
 132         if (!hcd)
 133                 return -ENOMEM;
 134
 135         hcd->rsrc_start = res->start;
 136         hcd->rsrc_len = resource_size(res);
 137
 138         if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len,
 139                                 driver->description)) {
 140                 dev_dbg(&pdev->dev, "controller already in use\n");
 141                 ret = -EBUSY;
 142                 goto put_hcd;
 143         }
 144
 145         hcd->regs = ioremap_nocache(hcd->rsrc_start, hcd->rsrc_len);
 146         if (!hcd->regs) {
 147                 dev_dbg(&pdev->dev, "error mapping memory\n");
 148                 ret = -EFAULT;
 149                 goto release_mem_region;
 150         }
 151
 152         /*
 153          * Not all platforms have a clk so it is not an error if the
 154          * clock does not exists.
 155          */
 156         clk = devm_clk_get(&pdev->dev, NULL);
 157         if (!IS_ERR(clk)) {
 158                 ret = clk_prepare_enable(clk);
 159                 if (ret)
 160                         goto unmap_registers;
 161         }
 162
 163         ret = usb_add_hcd(hcd, irq, IRQF_SHARED);
 164         if (ret)
 165                 goto disable_clk;
 166
 167         device_wakeup_enable(hcd->self.controller);
 168
 169         /* USB 2.0 roothub is stored in the platform_device now. */
 170         hcd = platform_get_drvdata(pdev);
 171         xhci = hcd_to_xhci(hcd);
 172         xhci->clk = clk;
 173         xhci->shared_hcd = usb_create_shared_hcd(driver, &pdev->dev,
 174                         dev_name(&pdev->dev), hcd);
 175         if (!xhci->shared_hcd) {
 176                 ret = -ENOMEM;
 177                 goto dealloc_usb2_hcd;
 178         }
 179
 180         /*
 181          * Set the xHCI pointer before xhci_plat_setup() (aka hcd_driver.reset)
 182          * is called by usb_add_hcd().
 183          */
 184         *((struct xhci_hcd **) xhci->shared_hcd->hcd_priv) = xhci;
 185
 186         if (HCC_MAX_PSA(xhci->hcc_params) >= 4)
 187                 xhci->shared_hcd->can_do_streams = 1;
 188
 189         ret = usb_add_hcd(xhci->shared_hcd, irq, IRQF_SHARED);
 190         if (ret)
 191                 goto put_usb3_hcd;
 192
 193         return 0;
 194
 195 put_usb3_hcd:
 196         usb_put_hcd(xhci->shared_hcd);
 197
 198 dealloc_usb2_hcd:
 199         usb_remove_hcd(hcd);
 200
 201 disable_clk:
 202         if (!IS_ERR(clk))
 203                 clk_disable_unprepare(clk);
 204
 205 unmap_registers:
 206         iounmap(hcd->regs);
 207
 208 release_mem_region:
 209         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 210
 211 put_hcd:
 212         usb_put_hcd(hcd);
 213
 214         return ret;
 215 }
 216
 217 static int xhci_plat_remove(struct platform_device *dev)
 218 {
 219         struct usb_hcd  *hcd = platform_get_drvdata(dev);
 220         struct xhci_hcd *xhci = hcd_to_xhci(hcd);
 221         struct clk *clk = xhci->clk;
 222
 223         usb_remove_hcd(xhci->shared_hcd);
 224         usb_put_hcd(xhci->shared_hcd);
 225
 226         usb_remove_hcd(hcd);
 227         if (!IS_ERR(clk))
 228                 clk_disable_unprepare(clk);
 229         iounmap(hcd->regs);
 230         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 231         usb_put_hcd(hcd);
 232         kfree(xhci);
 233
 234         return 0;
 235 }
 236
 237 #ifdef CONFIG_PM
 238 static int xhci_plat_suspend(struct device *dev)
 239 {
 240         struct usb_hcd  *hcd = dev_get_drvdata(dev);
 241         struct xhci_hcd *xhci = hcd_to_xhci(hcd);
 242
 243         return xhci_suspend(xhci);
 244 }
 245
 246 static int xhci_plat_resume(struct device *dev)
 247 {
 248         struct usb_hcd  *hcd = dev_get_drvdata(dev);
 249         struct xhci_hcd *xhci = hcd_to_xhci(hcd);
 250
 251         return xhci_resume(xhci, 0);
 252 }
 253
 254 static const struct dev_pm_ops xhci_plat_pm_ops = {
 255         SET_SYSTEM_SLEEP_PM_OPS(xhci_plat_suspend, xhci_plat_resume)
 256 };
 257 #define DEV_PM_OPS      (&xhci_plat_pm_ops)
 258 #else
 259 #define DEV_PM_OPS      NULL
 260 #endif /* CONFIG_PM */
 261
 262 #ifdef CONFIG_OF
 263 static const struct of_device_id usb_xhci_of_match[] = {
 264         { .compatible = "generic-xhci" },
 265         { .compatible = "xhci-platform" },
 266         { .compatible = "marvell,armada-375-xhci"},
 267         { .compatible = "marvell,armada-380-xhci"},
 268         { },
 269 };
 270 MODULE_DEVICE_TABLE(of, usb_xhci_of_match);
 271 #endif
 272
 273 static struct platform_driver usb_xhci_driver = {
 274         .probe  = xhci_plat_probe,
 275         .remove = xhci_plat_remove,
 276         .driver = {
 277                 .name = "xhci-hcd",
 278                 .pm = DEV_PM_OPS,
 279                 .of_match_table = of_match_ptr(usb_xhci_of_match),
 280         },
 281 };
 282 MODULE_ALIAS("platform:xhci-hcd");
 283
 284 int xhci_register_plat(void)
 285 {
 286         return platform_driver_register(&usb_xhci_driver);
 287 }
 288
 289 void xhci_unregister_plat(void)
 290 {
 291         platform_driver_unregister(&usb_xhci_driver);
 292 }