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