target/linux/brcm47xx/patches-3.2/182-USB-EHCI-Add-a-generic-platform-device-driver.patch

   1 From 1be00523336ac484c52681f838dfb8a76e8531cd Mon Sep 17 00:00:00 2001
   2 From: Hauke Mehrtens <hauke@hauke-m.de>
   3 Date: Sat, 26 Nov 2011 21:28:56 +0100
   4 Subject: [PATCH 182/186] USB: EHCI: Add a generic platform device driver
   5
   6 This adds a generic driver for platform devices. It works like the PCI
   7 driver and is based on it. This is for devices which do not have an own
   8 bus but their EHCI controller works like a PCI controller. It will be
   9 used for the Broadcom bcma and ssb USB EHCI controller.
  10
  11 Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
  12 ---
  13  drivers/usb/host/Kconfig         |   10 ++
  14  drivers/usb/host/ehci-hcd.c      |    5 +
  15  drivers/usb/host/ehci-platform.c |  199 ++++++++++++++++++++++++++++++++++++++
  16  3 files changed, 214 insertions(+), 0 deletions(-)
  17  create mode 100644 drivers/usb/host/ehci-platform.c
  18
  19 --- a/drivers/usb/host/Kconfig
  20 +++ b/drivers/usb/host/Kconfig
  21 @@ -388,6 +388,16 @@ config USB_OHCI_HCD_PLATFORM
  22
  23           If unsure, say N.
  24
  25 +config USB_EHCI_HCD_PLATFORM
  26 +       bool "Generic EHCI driver for a platform device"
  27 +       depends on USB_EHCI_HCD && EXPERIMENTAL
  28 +       default n
  29 +       ---help---
  30 +         Adds an EHCI host driver for a generic platform device, which
  31 +         provieds a memory space and an irq.
  32 +
  33 +         If unsure, say N.
  34 +
  35  config USB_OHCI_BIG_ENDIAN_DESC
  36         bool
  37         depends on USB_OHCI_HCD
  38 --- a/drivers/usb/host/ehci-hcd.c
  39 +++ b/drivers/usb/host/ehci-hcd.c
  40 @@ -1329,6 +1329,11 @@ MODULE_LICENSE ("GPL");
  41  #define PLATFORM_DRIVER                ehci_xls_driver
  42  #endif
  43
  44 +#ifdef CONFIG_USB_EHCI_HCD_PLATFORM
  45 +#include "ehci-platform.c"
  46 +#define PLATFORM_DRIVER                ehci_platform_driver
  47 +#endif
  48 +
  49  #if !defined(PCI_DRIVER) && !defined(PLATFORM_DRIVER) && \
  50      !defined(PS3_SYSTEM_BUS_DRIVER) && !defined(OF_PLATFORM_DRIVER) && \
  51      !defined(XILINX_OF_PLATFORM_DRIVER)
  52 --- /dev/null
  53 +++ b/drivers/usb/host/ehci-platform.c
  54 @@ -0,0 +1,199 @@
  55 +/*
  56 + * Generic platform ehci driver
  57 + *
  58 + * Copyright 2007 Steven Brown <sbrown@cortland.com>
  59 + * Copyright 2010-2012 Hauke Mehrtens <hauke@hauke-m.de>
  60 + *
  61 + * Derived from the ohci-ssb driver
  62 + * Copyright 2007 Michael Buesch <m@bues.ch>
  63 + *
  64 + * Derived from the EHCI-PCI driver
  65 + * Copyright (c) 2000-2004 by David Brownell
  66 + *
  67 + * Derived from the ohci-pci driver
  68 + * Copyright 1999 Roman Weissgaerber
  69 + * Copyright 2000-2002 David Brownell
  70 + * Copyright 1999 Linus Torvalds
  71 + * Copyright 1999 Gregory P. Smith
  72 + *
  73 + * Licensed under the GNU/GPL. See COPYING for details.
  74 + */
  75 +#include <linux/platform_device.h>
  76 +#include <linux/usb/hci_driver.h>
  77 +
  78 +static int ehci_platform_reset(struct usb_hcd *hcd)
  79 +{
  80 +       struct platform_device *pdev = to_platform_device(hcd->self.controller);
  81 +       struct usb_hci_pdata *pdata = pdev->dev.platform_data;
  82 +       struct ehci_hcd *ehci = hcd_to_ehci(hcd);
  83 +       int caps_offset = 0;
  84 +       int flags = 0;
  85 +       int retval;
  86 +
  87 +       if (pdata) {
  88 +               caps_offset = pdata->caps_offset;
  89 +               flags = pdata->flags;
  90 +       }
  91 +
  92 +       if (flags & USB_HCI_PDATA_HAS_TT_SET)
  93 +               hcd->has_tt = pdata->has_tt;
  94 +
  95 +       ehci->caps = hcd->regs + caps_offset;
  96 +       retval = ehci_setup(hcd);
  97 +       if (retval)
  98 +               return retval;
  99 +
 100 +       if (flags & USB_HCI_PDATA_PORT_POWER_SET)
 101 +               ehci_port_power(ehci, pdata->power_set_is_on);
 102 +
 103 +       return 0;
 104 +}
 105 +
 106 +static const struct hc_driver ehci_platform_hc_driver = {
 107 +       .description            = hcd_name,
 108 +       .product_desc           = "Generic Platform EHCI Controller",
 109 +       .hcd_priv_size          = sizeof(struct ehci_hcd),
 110 +
 111 +       .irq                    = ehci_irq,
 112 +       .flags                  = HCD_MEMORY | HCD_USB2,
 113 +
 114 +       .reset                  = ehci_platform_reset,
 115 +       .start                  = ehci_run,
 116 +       .stop                   = ehci_stop,
 117 +       .shutdown               = ehci_shutdown,
 118 +
 119 +       .urb_enqueue            = ehci_urb_enqueue,
 120 +       .urb_dequeue            = ehci_urb_dequeue,
 121 +       .endpoint_disable       = ehci_endpoint_disable,
 122 +       .endpoint_reset         = ehci_endpoint_reset,
 123 +
 124 +       .get_frame_number       = ehci_get_frame,
 125 +
 126 +       .hub_status_data        = ehci_hub_status_data,
 127 +       .hub_control            = ehci_hub_control,
 128 +#if defined(CONFIG_PM)
 129 +       .bus_suspend            = ehci_bus_suspend,
 130 +       .bus_resume             = ehci_bus_resume,
 131 +#endif
 132 +       .relinquish_port        = ehci_relinquish_port,
 133 +       .port_handed_over       = ehci_port_handed_over,
 134 +
 135 +       .update_device          = ehci_update_device,
 136 +
 137 +       .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete,
 138 +};
 139 +
 140 +static int __devinit ehci_platform_probe(struct platform_device *dev)
 141 +{
 142 +       struct usb_hcd *hcd;
 143 +       struct resource *res_mem;
 144 +       int irq;
 145 +       int err = -ENOMEM;
 146 +
 147 +       if (usb_disabled())
 148 +               return -ENODEV;
 149 +
 150 +       irq = platform_get_irq(dev, 0);
 151 +       if (irq < 0) {
 152 +               pr_err("no irq provieded");
 153 +               return irq;
 154 +       }
 155 +       res_mem = platform_get_resource(dev, IORESOURCE_MEM, 0);
 156 +       if (!res_mem) {
 157 +               pr_err("no memory recourse provieded");
 158 +               return -ENXIO;
 159 +       }
 160 +
 161 +       hcd = usb_create_hcd(&ehci_platform_hc_driver, &dev->dev,
 162 +                            dev_name(&dev->dev));
 163 +       if (!hcd)
 164 +               return -ENOMEM;
 165 +
 166 +       hcd->rsrc_start = res_mem->start;
 167 +       hcd->rsrc_len = resource_size(res_mem);
 168 +
 169 +       if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
 170 +               pr_err("controller already in use");
 171 +               err = -EBUSY;
 172 +               goto err_put_hcd;
 173 +       }
 174 +
 175 +       hcd->regs = ioremap_nocache(hcd->rsrc_start, hcd->rsrc_len);
 176 +       if (!hcd->regs)
 177 +               goto err_release_region;
 178 +       err = usb_add_hcd(hcd, irq, IRQF_SHARED);
 179 +       if (err)
 180 +               goto err_iounmap;
 181 +
 182 +       platform_set_drvdata(dev, hcd);
 183 +
 184 +       return err;
 185 +
 186 +err_iounmap:
 187 +       iounmap(hcd->regs);
 188 +err_release_region:
 189 +       release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 190 +err_put_hcd:
 191 +       usb_put_hcd(hcd);
 192 +       return err;
 193 +}
 194 +
 195 +static int __devexit ehci_platform_remove(struct platform_device *dev)
 196 +{
 197 +       struct usb_hcd *hcd = platform_get_drvdata(dev);
 198 +
 199 +       usb_remove_hcd(hcd);
 200 +       iounmap(hcd->regs);
 201 +       release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 202 +       usb_put_hcd(hcd);
 203 +       platform_set_drvdata(dev, NULL);
 204 +
 205 +       return 0;
 206 +}
 207 +
 208 +#ifdef CONFIG_PM
 209 +
 210 +static int ehci_platform_suspend(struct device *dev)
 211 +{
 212 +       struct usb_hcd *hcd = dev_get_drvdata(dev);
 213 +       bool wakeup = device_may_wakeup(dev);
 214 +
 215 +       ehci_prepare_ports_for_controller_suspend(hcd_to_ehci(hcd), wakeup);
 216 +       return 0;
 217 +}
 218 +
 219 +static int ehci_platform_resume(struct device *dev)
 220 +{
 221 +       struct usb_hcd *hcd = dev_get_drvdata(dev);
 222 +
 223 +       ehci_prepare_ports_for_controller_resume(hcd_to_ehci(hcd));
 224 +       return 0;
 225 +}
 226 +
 227 +#else /* !CONFIG_PM */
 228 +#define ehci_platform_suspend  NULL
 229 +#define ehci_platform_resume   NULL
 230 +#endif /* CONFIG_PM */
 231 +
 232 +static const struct platform_device_id ehci_platform_table[] = {
 233 +       { "ehci-platform", 0 },
 234 +       { }
 235 +};
 236 +MODULE_DEVICE_TABLE(platform, ehci_platform_table);
 237 +
 238 +static const struct dev_pm_ops ehci_platform_pm_ops = {
 239 +       .suspend        = ehci_platform_suspend,
 240 +       .resume         = ehci_platform_resume,
 241 +};
 242 +
 243 +static struct platform_driver ehci_platform_driver = {
 244 +       .id_table       = ehci_platform_table,
 245 +       .probe          = ehci_platform_probe,
 246 +       .remove         = __devexit_p(ehci_platform_remove),
 247 +       .shutdown       = usb_hcd_platform_shutdown,
 248 +       .driver         = {
 249 +               .owner  = THIS_MODULE,
 250 +               .name   = "ehci-platform",
 251 +               .pm     = &ehci_platform_pm_ops,
 252 +       }
 253 +};