drivers/usb/host/ehci-au1xxx.c

   1 /*
   2  * EHCI HCD (Host Controller Driver) for USB.
   3  *
   4  * (C) Copyright 2000-2004 David Brownell <dbrownell@users.sourceforge.net>
   5  *
   6  * Bus Glue for AMD Alchemy Au1xxx
   7  *
   8  * Based on "ohci-au1xxx.c" by Matt Porter <mporter@kernel.crashing.org>
   9  *
  10  * Modified for AMD Alchemy Au1200 EHC
  11  *  by K.Boge <karsten.boge@amd.com>
  12  *
  13  * This file is licenced under the GPL.
  14  */
  15
  16 #include <linux/platform_device.h>
  17 #include <asm/mach-au1x00/au1000.h>
  18
  19 #define USB_HOST_CONFIG   (USB_MSR_BASE + USB_MSR_MCFG)
  20 #define USB_MCFG_PFEN     (1<<31)
  21 #define USB_MCFG_RDCOMB   (1<<30)
  22 #define USB_MCFG_SSDEN    (1<<23)
  23 #define USB_MCFG_PHYPLLEN (1<<19)
  24 #define USB_MCFG_EHCCLKEN (1<<17)
  25 #define USB_MCFG_UCAM     (1<<7)
  26 #define USB_MCFG_EBMEN    (1<<3)
  27 #define USB_MCFG_EMEMEN   (1<<2)
  28
  29 #define USBH_ENABLE_CE    (USB_MCFG_PHYPLLEN | USB_MCFG_EHCCLKEN)
  30
  31 #ifdef CONFIG_DMA_COHERENT
  32 #define USBH_ENABLE_INIT  (USBH_ENABLE_CE \
  33                          | USB_MCFG_PFEN | USB_MCFG_RDCOMB \
  34                          | USB_MCFG_SSDEN | USB_MCFG_UCAM \
  35                          | USB_MCFG_EBMEN | USB_MCFG_EMEMEN)
  36 #else
  37 #define USBH_ENABLE_INIT  (USBH_ENABLE_CE \
  38                          | USB_MCFG_PFEN | USB_MCFG_RDCOMB \
  39                          | USB_MCFG_SSDEN \
  40                          | USB_MCFG_EBMEN | USB_MCFG_EMEMEN)
  41 #endif
  42 #define USBH_DISABLE      (USB_MCFG_EBMEN | USB_MCFG_EMEMEN)
  43
  44 #endif                          /* Au1200 */
  45
  46 extern int usb_disabled(void);
  47
  48 /*-------------------------------------------------------------------------*/
  49
  50 static void au1xxx_start_ehc(struct platform_device *dev)
  51 {
  52         pr_debug(__FILE__ ": starting Au1xxx EHCI USB Controller\n");
  53
  54         /* write HW defaults again in case Yamon cleared them */
  55         if (au_readl(USB_HOST_CONFIG) == 0) {
  56                 au_writel(0x00d02000, USB_HOST_CONFIG);
  57                 au_readl(USB_HOST_CONFIG);
  58                 udelay(1000);
  59         }
  60         /* enable host controller */
  61         au_writel(USBH_ENABLE_CE | au_readl(USB_HOST_CONFIG), USB_HOST_CONFIG);
  62         au_readl(USB_HOST_CONFIG);
  63         udelay(1000);
  64         au_writel(USBH_ENABLE_INIT | au_readl(USB_HOST_CONFIG),
  65                   USB_HOST_CONFIG);
  66         au_readl(USB_HOST_CONFIG);
  67         udelay(1000);
  68
  69         pr_debug(__FILE__ ": Clock to USB host has been enabled\n");
  70 }
  71
  72 static void au1xxx_stop_ehc(struct platform_device *dev)
  73 {
  74         pr_debug(__FILE__ ": stopping Au1xxx EHCI USB Controller\n");
  75
  76         /* Disable mem */
  77         au_writel(~USBH_DISABLE & au_readl(USB_HOST_CONFIG), USB_HOST_CONFIG);
  78         udelay(1000);
  79         /* Disable clock */
  80         au_writel(~USB_MCFG_EHCCLKEN & au_readl(USB_HOST_CONFIG),
  81                   USB_HOST_CONFIG);
  82         au_readl(USB_HOST_CONFIG);
  83 }
  84
  85 /*-------------------------------------------------------------------------*/
  86
  87 /* configure so an HC device and id are always provided */
  88 /* always called with process context; sleeping is OK */
  89
  90 /**
  91  * usb_ehci_au1xxx_probe - initialize Au1xxx-based HCDs
  92  * Context: !in_interrupt()
  93  *
  94  * Allocates basic resources for this USB host controller, and
  95  * then invokes the start() method for the HCD associated with it
  96  * through the hotplug entry's driver_data.
  97  *
  98  */
  99 int usb_ehci_au1xxx_probe(const struct hc_driver *driver,
 100                           struct usb_hcd **hcd_out, struct platform_device *dev)
 101 {
 102         int retval;
 103         struct usb_hcd *hcd;
 104         struct ehci_hcd *ehci;
 105
 106 #if defined(CONFIG_SOC_AU1200) && defined(CONFIG_DMA_COHERENT)
 107
 108         /* Au1200 AB USB does not support coherent memory */
 109         if (!(read_c0_prid() & 0xff)) {
 110                 pr_info("%s: this is chip revision AB!\n", dev->dev.name);
 111                 pr_info("%s: update your board or re-configure the kernel\n",
 112                         dev->dev.name);
 113                 return -ENODEV;
 114         }
 115 #endif
 116
 117         au1xxx_start_ehc(dev);
 118
 119         if (dev->resource[1].flags != IORESOURCE_IRQ) {
 120                 pr_debug("resource[1] is not IORESOURCE_IRQ");
 121                 retval = -ENOMEM;
 122         }
 123         hcd = usb_create_hcd(driver, &dev->dev, "Au1xxx");
 124         if (!hcd)
 125                 return -ENOMEM;
 126         hcd->rsrc_start = dev->resource[0].start;
 127         hcd->rsrc_len = dev->resource[0].end - dev->resource[0].start + 1;
 128
 129         if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
 130                 pr_debug("request_mem_region failed");
 131                 retval = -EBUSY;
 132                 goto err1;
 133         }
 134
 135         hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
 136         if (!hcd->regs) {
 137                 pr_debug("ioremap failed");
 138                 retval = -ENOMEM;
 139                 goto err2;
 140         }
 141
 142         ehci = hcd_to_ehci(hcd);
 143         ehci->caps = hcd->regs;
 144         ehci->regs = hcd->regs + HC_LENGTH(readl(&ehci->caps->hc_capbase));
 145         /* cache this readonly data; minimize chip reads */
 146         ehci->hcs_params = readl(&ehci->caps->hcs_params);
 147
 148         /* ehci_hcd_init(hcd_to_ehci(hcd)); */
 149
 150         retval =
 151             usb_add_hcd(hcd, dev->resource[1].start, SA_INTERRUPT | SA_SHIRQ);
 152         if (retval == 0)
 153                 return retval;
 154
 155         au1xxx_stop_ehc(dev);
 156         iounmap(hcd->regs);
 157 err2:
 158         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 159 err1:
 160         usb_put_hcd(hcd);
 161         return retval;
 162 }
 163
 164 /* may be called without controller electrically present */
 165 /* may be called with controller, bus, and devices active */
 166
 167 /**
 168  * usb_ehci_hcd_au1xxx_remove - shutdown processing for Au1xxx-based HCDs
 169  * @dev: USB Host Controller being removed
 170  * Context: !in_interrupt()
 171  *
 172  * Reverses the effect of usb_ehci_hcd_au1xxx_probe(), first invoking
 173  * the HCD's stop() method.  It is always called from a thread
 174  * context, normally "rmmod", "apmd", or something similar.
 175  *
 176  */
 177 void usb_ehci_au1xxx_remove(struct usb_hcd *hcd, struct platform_device *dev)
 178 {
 179         usb_remove_hcd(hcd);
 180         iounmap(hcd->regs);
 181         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 182         usb_put_hcd(hcd);
 183         au1xxx_stop_ehc(dev);
 184 }
 185
 186 /*-------------------------------------------------------------------------*/
 187
 188 static const struct hc_driver ehci_au1xxx_hc_driver = {
 189         .description = hcd_name,
 190         .product_desc = "Au1xxx EHCI",
 191         .hcd_priv_size = sizeof(struct ehci_hcd),
 192
 193         /*
 194          * generic hardware linkage
 195          */
 196         .irq = ehci_irq,
 197         .flags = HCD_MEMORY | HCD_USB2,
 198
 199         /*
 200          * basic lifecycle operations
 201          */
 202         .reset = ehci_init,
 203         .start = ehci_run,
 204         .stop = ehci_stop,
 205
 206         /*
 207          * managing i/o requests and associated device resources
 208          */
 209         .urb_enqueue = ehci_urb_enqueue,
 210         .urb_dequeue = ehci_urb_dequeue,
 211         .endpoint_disable = ehci_endpoint_disable,
 212
 213         /*
 214          * scheduling support
 215          */
 216         .get_frame_number = ehci_get_frame,
 217
 218         /*
 219          * root hub support
 220          */
 221         .hub_status_data = ehci_hub_status_data,
 222         .hub_control = ehci_hub_control,
 223 #ifdef  CONFIG_PM
 224         .hub_suspend = ehci_hub_suspend,
 225         .hub_resume = ehci_hub_resume,
 226 #endif
 227 };
 228
 229 /*-------------------------------------------------------------------------*/
 230
 231 static int ehci_hcd_au1xxx_drv_probe(struct device *dev)
 232 {
 233         struct platform_device *pdev = to_platform_device(dev);
 234         struct usb_hcd *hcd = NULL;
 235         int ret;
 236
 237         pr_debug("In ehci_hcd_au1xxx_drv_probe\n");
 238
 239         if (usb_disabled())
 240                 return -ENODEV;
 241
 242         ret = usb_ehci_au1xxx_probe(&ehci_au1xxx_hc_driver, &hcd, pdev);
 243         return ret;
 244 }
 245
 246 static int ehci_hcd_au1xxx_drv_remove(struct device *dev)
 247 {
 248         struct platform_device *pdev = to_platform_device(dev);
 249         struct usb_hcd *hcd = dev_get_drvdata(dev);
 250
 251         usb_ehci_au1xxx_remove(hcd, pdev);
 252         return 0;
 253 }
 254
 255  /*TBD*/
 256 /*static int ehci_hcd_au1xxx_drv_suspend(struct device *dev)
 257 {
 258         struct platform_device *pdev = to_platform_device(dev);
 259         struct usb_hcd *hcd = dev_get_drvdata(dev);
 260
 261         return 0;
 262 }
 263 static int ehci_hcd_au1xxx_drv_resume(struct device *dev)
 264 {
 265         struct platform_device *pdev = to_platform_device(dev);
 266         struct usb_hcd *hcd = dev_get_drvdata(dev);
 267
 268         return 0;
 269 }
 270 */
 271 MODULE_ALIAS("au1xxx-ehci");
 272 /* FIXME use "struct platform_driver" */
 273 static struct device_driver ehci_hcd_au1xxx_driver = {
 274         .name = "au1xxx-ehci",
 275         .bus = &platform_bus_type,
 276         .probe = ehci_hcd_au1xxx_drv_probe,
 277         .remove = ehci_hcd_au1xxx_drv_remove,
 278         /*.suspend      = ehci_hcd_au1xxx_drv_suspend, */
 279         /*.resume       = ehci_hcd_au1xxx_drv_resume, */
 280 };