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 #ifndef CONFIG_SOC_AU1200
  20 #error "this Alchemy chip doesn't have EHCI"
  21 #else                           /* Au1200 */
  22
  23 #define USB_HOST_CONFIG   (USB_MSR_BASE + USB_MSR_MCFG)
  24 #define USB_MCFG_PFEN     (1<<31)
  25 #define USB_MCFG_RDCOMB   (1<<30)
  26 #define USB_MCFG_SSDEN    (1<<23)
  27 #define USB_MCFG_PHYPLLEN (1<<19)
  28 #define USB_MCFG_EHCCLKEN (1<<17)
  29 #define USB_MCFG_UCAM     (1<<7)
  30 #define USB_MCFG_EBMEN    (1<<3)
  31 #define USB_MCFG_EMEMEN   (1<<2)
  32
  33 #define USBH_ENABLE_CE    (USB_MCFG_PHYPLLEN | USB_MCFG_EHCCLKEN)
  34
  35 #ifdef CONFIG_DMA_COHERENT
  36 #define USBH_ENABLE_INIT  (USBH_ENABLE_CE \
  37                          | USB_MCFG_PFEN | USB_MCFG_RDCOMB \
  38                          | USB_MCFG_SSDEN | USB_MCFG_UCAM \
  39                          | USB_MCFG_EBMEN | USB_MCFG_EMEMEN)
  40 #else
  41 #define USBH_ENABLE_INIT  (USBH_ENABLE_CE \
  42                          | USB_MCFG_PFEN | USB_MCFG_RDCOMB \
  43                          | USB_MCFG_SSDEN \
  44                          | USB_MCFG_EBMEN | USB_MCFG_EMEMEN)
  45 #endif
  46 #define USBH_DISABLE      (USB_MCFG_EBMEN | USB_MCFG_EMEMEN)
  47
  48 #endif                          /* Au1200 */
  49
  50 extern int usb_disabled(void);
  51
  52 /*-------------------------------------------------------------------------*/
  53
  54 static void au1xxx_start_ehc(struct platform_device *dev)
  55 {
  56         pr_debug(__FILE__ ": starting Au1xxx EHCI USB Controller\n");
  57
  58         /* write HW defaults again in case Yamon cleared them */
  59         if (au_readl(USB_HOST_CONFIG) == 0) {
  60                 au_writel(0x00d02000, USB_HOST_CONFIG);
  61                 au_readl(USB_HOST_CONFIG);
  62                 udelay(1000);
  63         }
  64         /* enable host controller */
  65         au_writel(USBH_ENABLE_CE | au_readl(USB_HOST_CONFIG), USB_HOST_CONFIG);
  66         au_readl(USB_HOST_CONFIG);
  67         udelay(1000);
  68         au_writel(USBH_ENABLE_INIT | au_readl(USB_HOST_CONFIG),
  69                   USB_HOST_CONFIG);
  70         au_readl(USB_HOST_CONFIG);
  71         udelay(1000);
  72
  73         pr_debug(__FILE__ ": Clock to USB host has been enabled\n");
  74 }
  75
  76 static void au1xxx_stop_ehc(struct platform_device *dev)
  77 {
  78         pr_debug(__FILE__ ": stopping Au1xxx EHCI USB Controller\n");
  79
  80         /* Disable mem */
  81         au_writel(~USBH_DISABLE & au_readl(USB_HOST_CONFIG), USB_HOST_CONFIG);
  82         udelay(1000);
  83         /* Disable clock */
  84         au_writel(~USB_MCFG_EHCCLKEN & au_readl(USB_HOST_CONFIG),
  85                   USB_HOST_CONFIG);
  86         au_readl(USB_HOST_CONFIG);
  87 }
  88
  89 /*-------------------------------------------------------------------------*/
  90
  91 /* configure so an HC device and id are always provided */
  92 /* always called with process context; sleeping is OK */
  93
  94 /**
  95  * usb_ehci_au1xxx_probe - initialize Au1xxx-based HCDs
  96  * Context: !in_interrupt()
  97  *
  98  * Allocates basic resources for this USB host controller, and
  99  * then invokes the start() method for the HCD associated with it
 100  * through the hotplug entry's driver_data.
 101  *
 102  */
 103 int usb_ehci_au1xxx_probe(const struct hc_driver *driver,
 104                           struct usb_hcd **hcd_out, struct platform_device *dev)
 105 {
 106         int retval;
 107         struct usb_hcd *hcd;
 108         struct ehci_hcd *ehci;
 109
 110 #if defined(CONFIG_SOC_AU1200) && defined(CONFIG_DMA_COHERENT)
 111
 112         /* Au1200 AB USB does not support coherent memory */
 113         if (!(read_c0_prid() & 0xff)) {
 114                 pr_info("%s: this is chip revision AB!\n", dev->dev.name);
 115                 pr_info("%s: update your board or re-configure the kernel\n",
 116                         dev->dev.name);
 117                 return -ENODEV;
 118         }
 119 #endif
 120
 121         au1xxx_start_ehc(dev);
 122
 123         if (dev->resource[1].flags != IORESOURCE_IRQ) {
 124                 pr_debug("resource[1] is not IORESOURCE_IRQ");
 125                 retval = -ENOMEM;
 126         }
 127         hcd = usb_create_hcd(driver, &dev->dev, "Au1xxx");
 128         if (!hcd)
 129                 return -ENOMEM;
 130         hcd->rsrc_start = dev->resource[0].start;
 131         hcd->rsrc_len = dev->resource[0].end - dev->resource[0].start + 1;
 132
 133         if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
 134                 pr_debug("request_mem_region failed");
 135                 retval = -EBUSY;
 136                 goto err1;
 137         }
 138
 139         hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
 140         if (!hcd->regs) {
 141                 pr_debug("ioremap failed");
 142                 retval = -ENOMEM;
 143                 goto err2;
 144         }
 145
 146         ehci = hcd_to_ehci(hcd);
 147         ehci->caps = hcd->regs;
 148         ehci->regs = hcd->regs + HC_LENGTH(readl(&ehci->caps->hc_capbase));
 149         /* cache this readonly data; minimize chip reads */
 150         ehci->hcs_params = readl(&ehci->caps->hcs_params);
 151
 152         /* ehci_hcd_init(hcd_to_ehci(hcd)); */
 153
 154         retval =
 155             usb_add_hcd(hcd, dev->resource[1].start, SA_INTERRUPT | SA_SHIRQ);
 156         if (retval == 0)
 157                 return retval;
 158
 159         au1xxx_stop_ehc(dev);
 160         iounmap(hcd->regs);
 161 err2:
 162         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 163 err1:
 164         usb_put_hcd(hcd);
 165         return retval;
 166 }
 167
 168 /* may be called without controller electrically present */
 169 /* may be called with controller, bus, and devices active */
 170
 171 /**
 172  * usb_ehci_hcd_au1xxx_remove - shutdown processing for Au1xxx-based HCDs
 173  * @dev: USB Host Controller being removed
 174  * Context: !in_interrupt()
 175  *
 176  * Reverses the effect of usb_ehci_hcd_au1xxx_probe(), first invoking
 177  * the HCD's stop() method.  It is always called from a thread
 178  * context, normally "rmmod", "apmd", or something similar.
 179  *
 180  */
 181 void usb_ehci_au1xxx_remove(struct usb_hcd *hcd, struct platform_device *dev)
 182 {
 183         usb_remove_hcd(hcd);
 184         iounmap(hcd->regs);
 185         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 186         usb_put_hcd(hcd);
 187         au1xxx_stop_ehc(dev);
 188 }
 189
 190 /*-------------------------------------------------------------------------*/
 191
 192 static const struct hc_driver ehci_au1xxx_hc_driver = {
 193         .description = hcd_name,
 194         .product_desc = "Au1xxx EHCI",
 195         .hcd_priv_size = sizeof(struct ehci_hcd),
 196
 197         /*
 198          * generic hardware linkage
 199          */
 200         .irq = ehci_irq,
 201         .flags = HCD_MEMORY | HCD_USB2,
 202
 203         /*
 204          * basic lifecycle operations
 205          */
 206         .reset = ehci_init,
 207         .start = ehci_run,
 208         .stop = ehci_stop,
 209
 210         /*
 211          * managing i/o requests and associated device resources
 212          */
 213         .urb_enqueue = ehci_urb_enqueue,
 214         .urb_dequeue = ehci_urb_dequeue,
 215         .endpoint_disable = ehci_endpoint_disable,
 216
 217         /*
 218          * scheduling support
 219          */
 220         .get_frame_number = ehci_get_frame,
 221
 222         /*
 223          * root hub support
 224          */
 225         .hub_status_data = ehci_hub_status_data,
 226         .hub_control = ehci_hub_control,
 227 #ifdef  CONFIG_PM
 228         .hub_suspend = ehci_hub_suspend,
 229         .hub_resume = ehci_hub_resume,
 230 #endif
 231 };
 232
 233 /*-------------------------------------------------------------------------*/
 234
 235 static int ehci_hcd_au1xxx_drv_probe(struct device *dev)
 236 {
 237         struct platform_device *pdev = to_platform_device(dev);
 238         struct usb_hcd *hcd = NULL;
 239         int ret;
 240
 241         pr_debug("In ehci_hcd_au1xxx_drv_probe\n");
 242
 243         if (usb_disabled())
 244                 return -ENODEV;
 245
 246         ret = usb_ehci_au1xxx_probe(&ehci_au1xxx_hc_driver, &hcd, pdev);
 247         return ret;
 248 }
 249
 250 static int ehci_hcd_au1xxx_drv_remove(struct device *dev)
 251 {
 252         struct platform_device *pdev = to_platform_device(dev);
 253         struct usb_hcd *hcd = dev_get_drvdata(dev);
 254
 255         usb_ehci_au1xxx_remove(hcd, pdev);
 256         return 0;
 257 }
 258
 259  /*TBD*/
 260 /*static int ehci_hcd_au1xxx_drv_suspend(struct device *dev)
 261 {
 262         struct platform_device *pdev = to_platform_device(dev);
 263         struct usb_hcd *hcd = dev_get_drvdata(dev);
 264
 265         return 0;
 266 }
 267 static int ehci_hcd_au1xxx_drv_resume(struct device *dev)
 268 {
 269         struct platform_device *pdev = to_platform_device(dev);
 270         struct usb_hcd *hcd = dev_get_drvdata(dev);
 271
 272         return 0;
 273 }
 274 */
 275 static struct device_driver ehci_hcd_au1xxx_driver = {
 276         .name = "au1xxx-ehci",
 277         .bus = &platform_bus_type,
 278         .probe = ehci_hcd_au1xxx_drv_probe,
 279         .remove = ehci_hcd_au1xxx_drv_remove,
 280         /*.suspend      = ehci_hcd_au1xxx_drv_suspend, */
 281         /*.resume       = ehci_hcd_au1xxx_drv_resume, */
 282 };
 283
 284 static int __init ehci_hcd_au1xxx_init(void)
 285 {
 286         pr_debug(DRIVER_INFO " (Au1xxx)\n");
 287
 288         return driver_register(&ehci_hcd_au1xxx_driver);
 289 }
 290
 291 static void __exit ehci_hcd_au1xxx_cleanup(void)
 292 {
 293         driver_unregister(&ehci_hcd_au1xxx_driver);
 294 }
 295
 296 module_init(ehci_hcd_au1xxx_init);
 297 module_exit(ehci_hcd_au1xxx_cleanup);