drivers/usb/host/ohci-at91.c

   1 /*
   2  * OHCI HCD (Host Controller Driver) for USB.
   3  *
   4  *  Copyright (C) 2004 SAN People (Pty) Ltd.
   5  *  Copyright (C) 2005 Thibaut VARENE <varenet@parisc-linux.org>
   6  *
   7  * AT91 Bus Glue
   8  *
   9  * Based on fragments of 2.4 driver by Rick Bronson.
  10  * Based on ohci-omap.c
  11  *
  12  * This file is licenced under the GPL.
  13  */
  14
  15 #include <linux/clk.h>
  16 #include <linux/platform_device.h>
  17
  18 #include <asm/mach-types.h>
  19 #include <asm/hardware.h>
  20 #include <asm/arch/board.h>
  21
  22 #ifndef CONFIG_ARCH_AT91
  23 #error "CONFIG_ARCH_AT91 must be defined."
  24 #endif
  25
  26 /* interface and function clocks */
  27 static struct clk *iclk, *fclk;
  28 static int clocked;
  29
  30 extern int usb_disabled(void);
  31
  32 /*-------------------------------------------------------------------------*/
  33
  34 static void at91_start_hc(struct platform_device *pdev)
  35 {
  36         struct usb_hcd *hcd = platform_get_drvdata(pdev);
  37         struct ohci_regs __iomem *regs = hcd->regs;
  38
  39         dev_dbg(&pdev->dev, "start\n");
  40
  41         /*
  42          * Start the USB clocks.
  43          */
  44         clk_enable(iclk);
  45         clk_enable(fclk);
  46         clocked = 1;
  47
  48         /*
  49          * The USB host controller must remain in reset.
  50          */
  51         writel(0, &regs->control);
  52 }
  53
  54 static void at91_stop_hc(struct platform_device *pdev)
  55 {
  56         struct usb_hcd *hcd = platform_get_drvdata(pdev);
  57         struct ohci_regs __iomem *regs = hcd->regs;
  58
  59         dev_dbg(&pdev->dev, "stop\n");
  60
  61         /*
  62          * Put the USB host controller into reset.
  63          */
  64         writel(0, &regs->control);
  65
  66         /*
  67          * Stop the USB clocks.
  68          */
  69         clk_disable(fclk);
  70         clk_disable(iclk);
  71         clocked = 0;
  72 }
  73
  74
  75 /*-------------------------------------------------------------------------*/
  76
  77 static int usb_hcd_at91_remove (struct usb_hcd *, struct platform_device *);
  78
  79 /* configure so an HC device and id are always provided */
  80 /* always called with process context; sleeping is OK */
  81
  82
  83 /**
  84  * usb_hcd_at91_probe - initialize AT91-based HCDs
  85  * Context: !in_interrupt()
  86  *
  87  * Allocates basic resources for this USB host controller, and
  88  * then invokes the start() method for the HCD associated with it
  89  * through the hotplug entry's driver_data.
  90  */
  91 static int usb_hcd_at91_probe(const struct hc_driver *driver,
  92                         struct platform_device *pdev)
  93 {
  94         int retval;
  95         struct usb_hcd *hcd = NULL;
  96
  97         if (pdev->num_resources != 2) {
  98                 pr_debug("hcd probe: invalid num_resources");
  99                 return -ENODEV;
 100         }
 101
 102         if ((pdev->resource[0].flags != IORESOURCE_MEM)
 103                         || (pdev->resource[1].flags != IORESOURCE_IRQ)) {
 104                 pr_debug("hcd probe: invalid resource type\n");
 105                 return -ENODEV;
 106         }
 107
 108         hcd = usb_create_hcd(driver, &pdev->dev, "at91");
 109         if (!hcd)
 110                 return -ENOMEM;
 111         hcd->rsrc_start = pdev->resource[0].start;
 112         hcd->rsrc_len = pdev->resource[0].end - pdev->resource[0].start + 1;
 113
 114         if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
 115                 pr_debug("request_mem_region failed\n");
 116                 retval = -EBUSY;
 117                 goto err1;
 118         }
 119
 120         hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
 121         if (!hcd->regs) {
 122                 pr_debug("ioremap failed\n");
 123                 retval = -EIO;
 124                 goto err2;
 125         }
 126
 127         iclk = clk_get(&pdev->dev, "ohci_clk");
 128         fclk = clk_get(&pdev->dev, "uhpck");
 129
 130         at91_start_hc(pdev);
 131         ohci_hcd_init(hcd_to_ohci(hcd));
 132
 133         retval = usb_add_hcd(hcd, pdev->resource[1].start, IRQF_DISABLED);
 134         if (retval == 0)
 135                 return retval;
 136
 137         /* Error handling */
 138         at91_stop_hc(pdev);
 139
 140         clk_put(fclk);
 141         clk_put(iclk);
 142
 143         iounmap(hcd->regs);
 144
 145  err2:
 146         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 147
 148  err1:
 149         usb_put_hcd(hcd);
 150         return retval;
 151 }
 152
 153
 154 /* may be called with controller, bus, and devices active */
 155
 156 /**
 157  * usb_hcd_at91_remove - shutdown processing for AT91-based HCDs
 158  * @dev: USB Host Controller being removed
 159  * Context: !in_interrupt()
 160  *
 161  * Reverses the effect of usb_hcd_at91_probe(), first invoking
 162  * the HCD's stop() method.  It is always called from a thread
 163  * context, "rmmod" or something similar.
 164  *
 165  */
 166 static int usb_hcd_at91_remove(struct usb_hcd *hcd,
 167                                 struct platform_device *pdev)
 168 {
 169         usb_remove_hcd(hcd);
 170         at91_stop_hc(pdev);
 171         iounmap(hcd->regs);
 172         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 173         disable_irq_wake(hcd->irq);
 174
 175         clk_put(fclk);
 176         clk_put(iclk);
 177         fclk = iclk = NULL;
 178
 179         dev_set_drvdata(&pdev->dev, NULL);
 180         return 0;
 181 }
 182
 183 /*-------------------------------------------------------------------------*/
 184
 185 static int __devinit
 186 ohci_at91_start (struct usb_hcd *hcd)
 187 {
 188         struct at91_usbh_data   *board = hcd->self.controller->platform_data;
 189         struct ohci_hcd         *ohci = hcd_to_ohci (hcd);
 190         struct usb_device       *root = hcd->self.root_hub;
 191         int                     ret;
 192
 193         if ((ret = ohci_init(ohci)) < 0)
 194                 return ret;
 195
 196         root->maxchild = board->ports;
 197
 198         if ((ret = ohci_run(ohci)) < 0) {
 199                 err("can't start %s", hcd->self.bus_name);
 200                 ohci_stop(hcd);
 201                 return ret;
 202         }
 203         return 0;
 204 }
 205
 206 /*-------------------------------------------------------------------------*/
 207
 208 static const struct hc_driver ohci_at91_hc_driver = {
 209         .description =          hcd_name,
 210         .product_desc =         "AT91 OHCI",
 211         .hcd_priv_size =        sizeof(struct ohci_hcd),
 212
 213         /*
 214          * generic hardware linkage
 215          */
 216         .irq =                  ohci_irq,
 217         .flags =                HCD_USB11 | HCD_MEMORY,
 218
 219         /*
 220          * basic lifecycle operations
 221          */
 222         .start =                ohci_at91_start,
 223         .stop =                 ohci_stop,
 224         .shutdown =             ohci_shutdown,
 225
 226         /*
 227          * managing i/o requests and associated device resources
 228          */
 229         .urb_enqueue =          ohci_urb_enqueue,
 230         .urb_dequeue =          ohci_urb_dequeue,
 231         .endpoint_disable =     ohci_endpoint_disable,
 232
 233         /*
 234          * scheduling support
 235          */
 236         .get_frame_number =     ohci_get_frame,
 237
 238         /*
 239          * root hub support
 240          */
 241         .hub_status_data =      ohci_hub_status_data,
 242         .hub_control =          ohci_hub_control,
 243         .hub_irq_enable =       ohci_rhsc_enable,
 244 #ifdef CONFIG_PM
 245         .bus_suspend =          ohci_bus_suspend,
 246         .bus_resume =           ohci_bus_resume,
 247 #endif
 248         .start_port_reset =     ohci_start_port_reset,
 249 };
 250
 251 /*-------------------------------------------------------------------------*/
 252
 253 static int ohci_hcd_at91_drv_probe(struct platform_device *pdev)
 254 {
 255         device_init_wakeup(&pdev->dev, 1);
 256         return usb_hcd_at91_probe(&ohci_at91_hc_driver, pdev);
 257 }
 258
 259 static int ohci_hcd_at91_drv_remove(struct platform_device *pdev)
 260 {
 261         device_init_wakeup(&pdev->dev, 0);
 262         return usb_hcd_at91_remove(platform_get_drvdata(pdev), pdev);
 263 }
 264
 265 #ifdef CONFIG_PM
 266
 267 static int
 268 ohci_hcd_at91_drv_suspend(struct platform_device *pdev, pm_message_t mesg)
 269 {
 270         struct usb_hcd  *hcd = platform_get_drvdata(pdev);
 271         struct ohci_hcd *ohci = hcd_to_ohci(hcd);
 272
 273         if (device_may_wakeup(&pdev->dev))
 274                 enable_irq_wake(hcd->irq);
 275         else
 276                 disable_irq_wake(hcd->irq);
 277
 278         /*
 279          * The integrated transceivers seem unable to notice disconnect,
 280          * reconnect, or wakeup without the 48 MHz clock active.  so for
 281          * correctness, always discard connection state (using reset).
 282          *
 283          * REVISIT: some boards will be able to turn VBUS off...
 284          */
 285         if (at91_suspend_entering_slow_clock()) {
 286                 ohci_usb_reset (ohci);
 287                 clk_disable(fclk);
 288                 clk_disable(iclk);
 289                 clocked = 0;
 290         }
 291
 292         return 0;
 293 }
 294
 295 static int ohci_hcd_at91_drv_resume(struct platform_device *pdev)
 296 {
 297         if (!clocked) {
 298                 clk_enable(iclk);
 299                 clk_enable(fclk);
 300         }
 301
 302         return 0;
 303 }
 304 #else
 305 #define ohci_hcd_at91_drv_suspend NULL
 306 #define ohci_hcd_at91_drv_resume  NULL
 307 #endif
 308
 309 MODULE_ALIAS("at91_ohci");
 310
 311 static struct platform_driver ohci_hcd_at91_driver = {
 312         .probe          = ohci_hcd_at91_drv_probe,
 313         .remove         = ohci_hcd_at91_drv_remove,
 314         .shutdown       = usb_hcd_platform_shutdown,
 315         .suspend        = ohci_hcd_at91_drv_suspend,
 316         .resume         = ohci_hcd_at91_drv_resume,
 317         .driver         = {
 318                 .name   = "at91_ohci",
 319                 .owner  = THIS_MODULE,
 320         },
 321 };
 322
 323 static int __init ohci_hcd_at91_init (void)
 324 {
 325         if (usb_disabled())
 326                 return -ENODEV;
 327
 328         return platform_driver_register(&ohci_hcd_at91_driver);
 329 }
 330
 331 static void __exit ohci_hcd_at91_cleanup (void)
 332 {
 333         platform_driver_unregister(&ohci_hcd_at91_driver);
 334 }
 335
 336 module_init (ohci_hcd_at91_init);
 337 module_exit (ohci_hcd_at91_cleanup);