target/linux/brcm47xx/patches-3.0/0031-USB-EHCI-Add-a-generic-platform-device-driver.patch

   1 From aa05e0048cec25719921291e8749674b8cc66fc0 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 18/21] 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 |  211 ++++++++++++++++++++++++++++++++++++++
  16  3 files changed, 226 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 @@ -1312,6 +1312,11 @@ MODULE_LICENSE ("GPL");
  41  #define PLATFORM_DRIVER                ehci_grlib_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 +1,211 @@
  55 +/*
  56 + * Generic platform ehci driver
  57 + *
  58 + * Copyright 2007 Steven Brown <sbrown@cortland.com>
  59 + * Copyright 2010-2011 Hauke Mehrtens <hauke@hauke-m.de>
  60 + *
  61 + * Derived from the ohci-ssb driver
  62 + * Copyright 2007 Michael Buesch <mb@bu3sch.de>
  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 +
  77 +static int ehci_platform_reset(struct usb_hcd *hcd)
  78 +{
  79 +       struct ehci_hcd *ehci = hcd_to_ehci(hcd);
  80 +       int retval;
  81 +
  82 +       ehci->caps = hcd->regs;
  83 +       ehci->regs = hcd->regs +
  84 +               HC_LENGTH(ehci, ehci_readl(ehci, &ehci->caps->hc_capbase));
  85 +
  86 +       dbg_hcs_params(ehci, "reset");
  87 +       dbg_hcc_params(ehci, "reset");
  88 +
  89 +       /* cache this readonly data; minimize chip reads */
  90 +       ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params);
  91 +
  92 +       retval = ehci_halt(ehci);
  93 +       if (retval)
  94 +               return retval;
  95 +
  96 +       /* data structure init */
  97 +       retval = ehci_init(hcd);
  98 +       if (retval)
  99 +               return retval;
 100 +
 101 +       ehci_reset(ehci);
 102 +
 103 +       ehci_port_power(ehci, 1);
 104 +
 105 +       return retval;
 106 +}
 107 +
 108 +static const struct hc_driver ehci_platform_hc_driver = {
 109 +       .description            = "platform-usb-ehci",
 110 +       .product_desc           = "Generic Platform EHCI Controller",
 111 +       .hcd_priv_size          = sizeof(struct ehci_hcd),
 112 +
 113 +       .irq                    = ehci_irq,
 114 +       .flags                  = HCD_MEMORY | HCD_USB2,
 115 +
 116 +       .reset                  = ehci_platform_reset,
 117 +       .start                  = ehci_run,
 118 +       .stop                   = ehci_stop,
 119 +       .shutdown               = ehci_shutdown,
 120 +
 121 +       .urb_enqueue            = ehci_urb_enqueue,
 122 +       .urb_dequeue            = ehci_urb_dequeue,
 123 +       .endpoint_disable       = ehci_endpoint_disable,
 124 +       .endpoint_reset         = ehci_endpoint_reset,
 125 +
 126 +       .get_frame_number       = ehci_get_frame,
 127 +
 128 +       .hub_status_data        = ehci_hub_status_data,
 129 +       .hub_control            = ehci_hub_control,
 130 +#if defined(CONFIG_PM)
 131 +       .bus_suspend            = ehci_bus_suspend,
 132 +       .bus_resume             = ehci_bus_resume,
 133 +#endif
 134 +       .relinquish_port        = ehci_relinquish_port,
 135 +       .port_handed_over       = ehci_port_handed_over,
 136 +
 137 +       .update_device          = ehci_update_device,
 138 +
 139 +       .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete,
 140 +};
 141 +
 142 +static int ehci_platform_attach(struct platform_device *dev)
 143 +{
 144 +       struct usb_hcd *hcd;
 145 +       struct resource *res_irq, *res_mem;
 146 +       int err = -ENOMEM;
 147 +
 148 +       hcd = usb_create_hcd(&ehci_platform_hc_driver, &dev->dev,
 149 +                            dev_name(&dev->dev));
 150 +       if (!hcd)
 151 +               goto err_return;
 152 +
 153 +       res_irq = platform_get_resource(dev, IORESOURCE_IRQ, 0);
 154 +       if (!res_irq) {
 155 +               err = -ENXIO;
 156 +               goto err_return;
 157 +       }
 158 +       res_mem = platform_get_resource(dev, IORESOURCE_MEM, 0);
 159 +       if (!res_mem) {
 160 +               err = -ENXIO;
 161 +               goto err_return;
 162 +       }
 163 +       hcd->rsrc_start = res_mem->start;
 164 +       hcd->rsrc_len = res_mem->end - res_mem->start + 1;
 165 +
 166 +       /*
 167 +        * start & size modified per sbutils.c
 168 +        */
 169 +       hcd->regs = ioremap_nocache(hcd->rsrc_start, hcd->rsrc_len);
 170 +       if (!hcd->regs)
 171 +               goto err_put_hcd;
 172 +       err = usb_add_hcd(hcd, res_irq->start, IRQF_SHARED);
 173 +       if (err)
 174 +               goto err_iounmap;
 175 +
 176 +       platform_set_drvdata(dev, hcd);
 177 +
 178 +       return err;
 179 +
 180 +err_iounmap:
 181 +       iounmap(hcd->regs);
 182 +err_put_hcd:
 183 +       usb_put_hcd(hcd);
 184 +err_return:
 185 +       return err;
 186 +}
 187 +
 188 +static int ehci_platform_probe(struct platform_device *dev)
 189 +{
 190 +       int err;
 191 +
 192 +       if (usb_disabled())
 193 +               return -ENODEV;
 194 +
 195 +       err = ehci_platform_attach(dev);
 196 +
 197 +       return err;
 198 +}
 199 +
 200 +static int ehci_platform_remove(struct platform_device *dev)
 201 +{
 202 +       struct usb_hcd *hcd;
 203 +
 204 +       hcd = platform_get_drvdata(dev);
 205 +       if (!hcd)
 206 +               return -ENODEV;
 207 +
 208 +       usb_remove_hcd(hcd);
 209 +       iounmap(hcd->regs);
 210 +       release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 211 +       usb_put_hcd(hcd);
 212 +
 213 +       return 0;
 214 +}
 215 +
 216 +static void ehci_platform_shutdown(struct platform_device *dev)
 217 +{
 218 +       struct usb_hcd *hcd;
 219 +
 220 +       hcd = platform_get_drvdata(dev);
 221 +       if (!hcd)
 222 +               return;
 223 +
 224 +       if (hcd->driver->shutdown)
 225 +               hcd->driver->shutdown(hcd);
 226 +}
 227 +
 228 +#ifdef CONFIG_PM
 229 +
 230 +static int ehci_platform_suspend(struct platform_device *dev,
 231 +                                pm_message_t state)
 232 +{
 233 +       return 0;
 234 +}
 235 +
 236 +static int ehci_platform_resume(struct platform_device *dev)
 237 +{
 238 +       struct usb_hcd *hcd = platform_get_drvdata(dev);
 239 +
 240 +       ehci_finish_controller_resume(hcd);
 241 +       return 0;
 242 +}
 243 +
 244 +#else /* !CONFIG_PM */
 245 +#define ehci_platform_suspend  NULL
 246 +#define ehci_platform_resume   NULL
 247 +#endif /* CONFIG_PM */
 248 +
 249 +static const struct platform_device_id ehci_platform_table[] = {
 250 +       { "ehci-platform", 0 },
 251 +       { }
 252 +};
 253 +MODULE_DEVICE_TABLE(platform, ehci_platform_table);
 254 +
 255 +static struct platform_driver ehci_platform_driver = {
 256 +       .id_table       = ehci_platform_table,
 257 +       .probe          = ehci_platform_probe,
 258 +       .remove         = ehci_platform_remove,
 259 +       .shutdown       = ehci_platform_shutdown,
 260 +       .suspend        = ehci_platform_suspend,
 261 +       .resume         = ehci_platform_resume,
 262 +       .driver         = {
 263 +               .name   = "ehci-platform",
 264 +       }
 265 +};