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/platform_device.h>
  15 #include <linux/module.h>
  16 #include <linux/slab.h>
  17 #include <linux/dma-mapping.h>
  18
  19 #include "xhci.h"
  20
  21 #ifdef CONFIG_MTK_XHCI
  22 #include <linux/xhci/xhci-mtk.h>
  23 #include <linux/of.h>
  24 #endif
  25
  26 static void xhci_plat_quirks(struct device *dev, struct xhci_hcd *xhci)
  27 {
  28         /*
  29          * As of now platform drivers don't provide MSI support so we ensure
  30          * here that the generic code does not try to make a pci_dev from our
  31          * dev struct in order to setup MSI
  32          */
  33         xhci->quirks |= XHCI_PLAT;
  34         //CC: MTK host controller gives a spurious successful event after a
  35         //    short transfer. Ignore it.
  36         xhci->quirks |= XHCI_SPURIOUS_SUCCESS;
  37         xhci->quirks |= XHCI_LPM_SUPPORT;
  38 }
  39
  40 /* called during probe() after chip reset completes */
  41 static int xhci_plat_setup(struct usb_hcd *hcd)
  42 {
  43         return xhci_gen_setup(hcd, xhci_plat_quirks);
  44 }
  45
  46 static const struct hc_driver xhci_plat_xhci_driver = {
  47         .description =          "xhci-hcd",
  48         .product_desc =         "xHCI Host Controller",
  49         .hcd_priv_size =        sizeof(struct xhci_hcd *),
  50
  51         /*
  52          * generic hardware linkage
  53          */
  54         .irq =                  xhci_irq,
  55         .flags =                HCD_MEMORY | HCD_USB3 | HCD_SHARED,
  56
  57         /*
  58          * basic lifecycle operations
  59          */
  60         .reset =                xhci_plat_setup,
  61         .start =                xhci_run,
  62         .stop =                 xhci_stop,
  63         .shutdown =             xhci_shutdown,
  64
  65         /*
  66          * managing i/o requests and associated device resources
  67          */
  68         .urb_enqueue =          xhci_urb_enqueue,
  69         .urb_dequeue =          xhci_urb_dequeue,
  70         .alloc_dev =            xhci_alloc_dev,
  71         .free_dev =             xhci_free_dev,
  72         .alloc_streams =        xhci_alloc_streams,
  73         .free_streams =         xhci_free_streams,
  74         .add_endpoint =         xhci_add_endpoint,
  75         .drop_endpoint =        xhci_drop_endpoint,
  76         .endpoint_reset =       xhci_endpoint_reset,
  77         .check_bandwidth =      xhci_check_bandwidth,
  78         .reset_bandwidth =      xhci_reset_bandwidth,
  79         .address_device =       xhci_address_device,
  80         .update_hub_device =    xhci_update_hub_device,
  81         .reset_device =         xhci_discover_or_reset_device,
  82
  83         /*
  84          * scheduling support
  85          */
  86         .get_frame_number =     xhci_get_frame,
  87
  88         /* Root hub support */
  89         .hub_control =          xhci_hub_control,
  90         .hub_status_data =      xhci_hub_status_data,
  91         .bus_suspend =          xhci_bus_suspend,
  92         .bus_resume =           xhci_bus_resume,
  93 };
  94
  95 #if defined(CONFIG_MTK_LM_MODE)
  96 #define XHCI_DMA_BIT_MASK DMA_BIT_MASK(64)
  97 #else
  98 #define XHCI_DMA_BIT_MASK DMA_BIT_MASK(32)
  99 #endif
 100
 101 static u64 xhci_dma_mask = XHCI_DMA_BIT_MASK;
 102
 103 static void xhci_hcd_release (struct device *dev)
 104 {
 105     printk(KERN_INFO "dev = 0x%p\n", dev);
 106 }
 107
 108 static int xhci_plat_probe(struct platform_device *pdev)
 109 {
 110         const struct hc_driver  *driver;
 111         struct xhci_hcd         *xhci;
 112         struct resource         *res;
 113         struct usb_hcd          *hcd;
 114         int                     ret;
 115         int                     irq;
 116
 117         if (usb_disabled())
 118                 return -ENODEV;
 119
 120         driver = &xhci_plat_xhci_driver;
 121
 122 #ifdef CONFIG_MTK_XHCI  /* device tree support */
 123         irq = platform_get_irq_byname(pdev, XHCI_DRIVER_NAME);
 124         printk("%s(%d): %d\n", __func__, __LINE__, irq);
 125         if(irq < 0)
 126                 return -ENODEV;
 127
 128         res = platform_get_resource_byname(pdev, IORESOURCE_MEM, XHCI_BASE_REGS_ADDR_RES_NAME);
 129         if (!res)
 130                 return -ENODEV;
 131
 132         pdev->dev.coherent_dma_mask = XHCI_DMA_BIT_MASK;
 133         pdev->dev.dma_mask = &xhci_dma_mask;
 134         pdev->dev.release = xhci_hcd_release;
 135 #else
 136         irq = platform_get_irq(pdev, 0);
 137         if (irq < 0)
 138                 return -ENODEV;
 139
 140         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 141         if (!res)
 142                 return -ENODEV;
 143 #endif
 144
 145         hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev));
 146         if (!hcd)
 147                 return -ENOMEM;
 148
 149         hcd->rsrc_start = res->start;
 150         hcd->rsrc_len = resource_size(res);
 151
 152         if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len,
 153                                 driver->description)) {
 154                 dev_dbg(&pdev->dev, "controller already in use\n");
 155                 ret = -EBUSY;
 156                 goto put_hcd;
 157         }
 158
 159         hcd->regs = ioremap_nocache(hcd->rsrc_start, hcd->rsrc_len);
 160         if (!hcd->regs) {
 161                 dev_dbg(&pdev->dev, "error mapping memory\n");
 162                 ret = -EFAULT;
 163                 goto release_mem_region;
 164         }
 165
 166         printk("%s(%d): logic 0x%p, phys 0x%p\n", __func__, __LINE__,
 167                 (void *)(unsigned long)res->start, hcd->regs);
 168
 169         #ifdef CONFIG_MTK_XHCI
 170         ret = usb_add_hcd(hcd, irq, IRQF_SHARED | IRQF_TRIGGER_LOW);
 171         #else
 172         ret = usb_add_hcd(hcd, irq, IRQF_SHARED);
 173         #endif
 174
 175         if (ret)
 176                 goto unmap_registers;
 177
 178         /* USB 2.0 roothub is stored in the platform_device now. */
 179         hcd = dev_get_drvdata(&pdev->dev);
 180         xhci = hcd_to_xhci(hcd);
 181         xhci->shared_hcd = usb_create_shared_hcd(driver, &pdev->dev,
 182                         dev_name(&pdev->dev), hcd);
 183         if (!xhci->shared_hcd) {
 184                 ret = -ENOMEM;
 185                 goto dealloc_usb2_hcd;
 186         }
 187
 188         /*
 189          * Set the xHCI pointer before xhci_plat_setup() (aka hcd_driver.reset)
 190          * is called by usb_add_hcd().
 191          */
 192         *((struct xhci_hcd **) xhci->shared_hcd->hcd_priv) = xhci;
 193
 194         #ifdef CONFIG_MTK_XHCI
 195     ret = usb_add_hcd(xhci->shared_hcd, irq, IRQF_SHARED | IRQF_TRIGGER_LOW);
 196     #else
 197         ret = usb_add_hcd(xhci->shared_hcd, irq, IRQF_SHARED);
 198     #endif
 199         if (ret)
 200                 goto put_usb3_hcd;
 201
 202         return 0;
 203
 204 put_usb3_hcd:
 205         usb_put_hcd(xhci->shared_hcd);
 206
 207 dealloc_usb2_hcd:
 208         usb_remove_hcd(hcd);
 209
 210 unmap_registers:
 211         iounmap(hcd->regs);
 212
 213 release_mem_region:
 214         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 215
 216 put_hcd:
 217         usb_put_hcd(hcd);
 218
 219         return ret;
 220 }
 221
 222 static int xhci_plat_remove(struct platform_device *dev)
 223 {
 224         struct usb_hcd  *hcd = platform_get_drvdata(dev);
 225         struct xhci_hcd *xhci = hcd_to_xhci(hcd);
 226
 227         xhci->xhc_state |= XHCI_STATE_REMOVING;
 228
 229         usb_remove_hcd(xhci->shared_hcd);
 230         usb_put_hcd(xhci->shared_hcd);
 231
 232         usb_remove_hcd(hcd);
 233         iounmap(hcd->regs);
 234         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 235         usb_put_hcd(hcd);
 236         #ifdef CONFIG_MTK_XHCI
 237         mtk_xhci_reset(xhci);
 238         #endif
 239         kfree(xhci);
 240
 241         return 0;
 242 }
 243
 244 #ifdef CONFIG_MTK_XHCI
 245 static const struct of_device_id mtk_xhci_of_match[] = {
 246         {
 247                 .compatible = "mediatek,USB3_XHCI",
 248         },
 249         { },
 250 };
 251 #endif
 252
 253 static struct platform_driver usb_xhci_driver = {
 254         .probe  = xhci_plat_probe,
 255         .remove = xhci_plat_remove,
 256         .driver = {
 257                 .name = "xhci-hcd",
 258 #ifdef CONFIG_MTK_XHCI
 259         .of_match_table = of_match_ptr(mtk_xhci_of_match),
 260 #endif
 261         },
 262 };
 263 MODULE_ALIAS("platform:xhci-hcd");
 264
 265 int xhci_register_plat(void)
 266 {
 267         return platform_driver_register(&usb_xhci_driver);
 268 }
 269
 270 void xhci_unregister_plat(void)
 271 {
 272         platform_driver_unregister(&usb_xhci_driver);
 273 }