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 <mach/hardware.h>
  19 #include <asm/gpio.h>
  20
  21 #include <mach/board.h>
  22 #include <mach/cpu.h>
  23
  24 #ifndef CONFIG_ARCH_AT91
  25 #error "CONFIG_ARCH_AT91 must be defined."
  26 #endif
  27
  28 /* interface and function clocks; sometimes also an AHB clock */
  29 static struct clk *iclk, *fclk, *hclk;
  30 static int clocked;
  31
  32 extern int usb_disabled(void);
  33
  34 /*-------------------------------------------------------------------------*/
  35
  36 static void at91_start_clock(void)
  37 {
  38         if (cpu_is_at91sam9261())
  39                 clk_enable(hclk);
  40         clk_enable(iclk);
  41         clk_enable(fclk);
  42         clocked = 1;
  43 }
  44
  45 static void at91_stop_clock(void)
  46 {
  47         clk_disable(fclk);
  48         clk_disable(iclk);
  49         if (cpu_is_at91sam9261())
  50                 clk_disable(hclk);
  51         clocked = 0;
  52 }
  53
  54 static void at91_start_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, "start\n");
  60
  61         /*
  62          * Start the USB clocks.
  63          */
  64         at91_start_clock();
  65
  66         /*
  67          * The USB host controller must remain in reset.
  68          */
  69         writel(0, &regs->control);
  70 }
  71
  72 static void at91_stop_hc(struct platform_device *pdev)
  73 {
  74         struct usb_hcd *hcd = platform_get_drvdata(pdev);
  75         struct ohci_regs __iomem *regs = hcd->regs;
  76
  77         dev_dbg(&pdev->dev, "stop\n");
  78
  79         /*
  80          * Put the USB host controller into reset.
  81          */
  82         writel(0, &regs->control);
  83
  84         /*
  85          * Stop the USB clocks.
  86          */
  87         at91_stop_clock();
  88 }
  89
  90
  91 /*-------------------------------------------------------------------------*/
  92
  93 static void usb_hcd_at91_remove (struct usb_hcd *, struct platform_device *);
  94
  95 /* configure so an HC device and id are always provided */
  96 /* always called with process context; sleeping is OK */
  97
  98
  99 /**
 100  * usb_hcd_at91_probe - initialize AT91-based HCDs
 101  * Context: !in_interrupt()
 102  *
 103  * Allocates basic resources for this USB host controller, and
 104  * then invokes the start() method for the HCD associated with it
 105  * through the hotplug entry's driver_data.
 106  */
 107 static int usb_hcd_at91_probe(const struct hc_driver *driver,
 108                         struct platform_device *pdev)
 109 {
 110         int retval;
 111         struct usb_hcd *hcd = NULL;
 112
 113         if (pdev->num_resources != 2) {
 114                 pr_debug("hcd probe: invalid num_resources");
 115                 return -ENODEV;
 116         }
 117
 118         if ((pdev->resource[0].flags != IORESOURCE_MEM)
 119                         || (pdev->resource[1].flags != IORESOURCE_IRQ)) {
 120                 pr_debug("hcd probe: invalid resource type\n");
 121                 return -ENODEV;
 122         }
 123
 124         hcd = usb_create_hcd(driver, &pdev->dev, "at91");
 125         if (!hcd)
 126                 return -ENOMEM;
 127         hcd->rsrc_start = pdev->resource[0].start;
 128         hcd->rsrc_len = pdev->resource[0].end - pdev->resource[0].start + 1;
 129
 130         if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
 131                 pr_debug("request_mem_region failed\n");
 132                 retval = -EBUSY;
 133                 goto err1;
 134         }
 135
 136         hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
 137         if (!hcd->regs) {
 138                 pr_debug("ioremap failed\n");
 139                 retval = -EIO;
 140                 goto err2;
 141         }
 142
 143         iclk = clk_get(&pdev->dev, "ohci_clk");
 144         fclk = clk_get(&pdev->dev, "uhpck");
 145         if (cpu_is_at91sam9261())
 146                 hclk = clk_get(&pdev->dev, "hck0");
 147
 148         at91_start_hc(pdev);
 149         ohci_hcd_init(hcd_to_ohci(hcd));
 150
 151         retval = usb_add_hcd(hcd, pdev->resource[1].start, IRQF_SHARED);
 152         if (retval == 0)
 153                 return retval;
 154
 155         /* Error handling */
 156         at91_stop_hc(pdev);
 157
 158         if (cpu_is_at91sam9261())
 159                 clk_put(hclk);
 160         clk_put(fclk);
 161         clk_put(iclk);
 162
 163         iounmap(hcd->regs);
 164
 165  err2:
 166         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 167
 168  err1:
 169         usb_put_hcd(hcd);
 170         return retval;
 171 }
 172
 173
 174 /* may be called with controller, bus, and devices active */
 175
 176 /**
 177  * usb_hcd_at91_remove - shutdown processing for AT91-based HCDs
 178  * @dev: USB Host Controller being removed
 179  * Context: !in_interrupt()
 180  *
 181  * Reverses the effect of usb_hcd_at91_probe(), first invoking
 182  * the HCD's stop() method.  It is always called from a thread
 183  * context, "rmmod" or something similar.
 184  *
 185  */
 186 static void usb_hcd_at91_remove(struct usb_hcd *hcd,
 187                                 struct platform_device *pdev)
 188 {
 189         usb_remove_hcd(hcd);
 190         at91_stop_hc(pdev);
 191         iounmap(hcd->regs);
 192         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 193         usb_put_hcd(hcd);
 194
 195         if (cpu_is_at91sam9261())
 196                 clk_put(hclk);
 197         clk_put(fclk);
 198         clk_put(iclk);
 199         fclk = iclk = hclk = NULL;
 200
 201         dev_set_drvdata(&pdev->dev, NULL);
 202 }
 203
 204 /*-------------------------------------------------------------------------*/
 205
 206 static int __devinit
 207 ohci_at91_start (struct usb_hcd *hcd)
 208 {
 209         struct at91_usbh_data   *board = hcd->self.controller->platform_data;
 210         struct ohci_hcd         *ohci = hcd_to_ohci (hcd);
 211         int                     ret;
 212
 213         if ((ret = ohci_init(ohci)) < 0)
 214                 return ret;
 215
 216         ohci->num_ports = board->ports;
 217
 218         if ((ret = ohci_run(ohci)) < 0) {
 219                 err("can't start %s", hcd->self.bus_name);
 220                 ohci_stop(hcd);
 221                 return ret;
 222         }
 223         return 0;
 224 }
 225
 226 /*-------------------------------------------------------------------------*/
 227
 228 static const struct hc_driver ohci_at91_hc_driver = {
 229         .description =          hcd_name,
 230         .product_desc =         "AT91 OHCI",
 231         .hcd_priv_size =        sizeof(struct ohci_hcd),
 232
 233         /*
 234          * generic hardware linkage
 235          */
 236         .irq =                  ohci_irq,
 237         .flags =                HCD_USB11 | HCD_MEMORY,
 238
 239         /*
 240          * basic lifecycle operations
 241          */
 242         .start =                ohci_at91_start,
 243         .stop =                 ohci_stop,
 244         .shutdown =             ohci_shutdown,
 245
 246         /*
 247          * managing i/o requests and associated device resources
 248          */
 249         .urb_enqueue =          ohci_urb_enqueue,
 250         .urb_dequeue =          ohci_urb_dequeue,
 251         .endpoint_disable =     ohci_endpoint_disable,
 252
 253         /*
 254          * scheduling support
 255          */
 256         .get_frame_number =     ohci_get_frame,
 257
 258         /*
 259          * root hub support
 260          */
 261         .hub_status_data =      ohci_hub_status_data,
 262         .hub_control =          ohci_hub_control,
 263 #ifdef CONFIG_PM
 264         .bus_suspend =          ohci_bus_suspend,
 265         .bus_resume =           ohci_bus_resume,
 266 #endif
 267         .start_port_reset =     ohci_start_port_reset,
 268 };
 269
 270 /*-------------------------------------------------------------------------*/
 271
 272 static int ohci_hcd_at91_drv_probe(struct platform_device *pdev)
 273 {
 274         struct at91_usbh_data   *pdata = pdev->dev.platform_data;
 275         int                     i;
 276
 277         if (pdata) {
 278                 /* REVISIT make the driver support per-port power switching,
 279                  * and also overcurrent detection.  Here we assume the ports
 280                  * are always powered while this driver is active, and use
 281                  * active-low power switches.
 282                  */
 283                 for (i = 0; i < ARRAY_SIZE(pdata->vbus_pin); i++) {
 284                         if (pdata->vbus_pin[i] <= 0)
 285                                 continue;
 286                         gpio_request(pdata->vbus_pin[i], "ohci_vbus");
 287                         gpio_direction_output(pdata->vbus_pin[i], 0);
 288                 }
 289         }
 290
 291         device_init_wakeup(&pdev->dev, 1);
 292         return usb_hcd_at91_probe(&ohci_at91_hc_driver, pdev);
 293 }
 294
 295 static int ohci_hcd_at91_drv_remove(struct platform_device *pdev)
 296 {
 297         struct at91_usbh_data   *pdata = pdev->dev.platform_data;
 298         int                     i;
 299
 300         if (pdata) {
 301                 for (i = 0; i < ARRAY_SIZE(pdata->vbus_pin); i++) {
 302                         if (pdata->vbus_pin[i] <= 0)
 303                                 continue;
 304                         gpio_direction_output(pdata->vbus_pin[i], 1);
 305                         gpio_free(pdata->vbus_pin[i]);
 306                 }
 307         }
 308
 309         device_init_wakeup(&pdev->dev, 0);
 310         usb_hcd_at91_remove(platform_get_drvdata(pdev), pdev);
 311         return 0;
 312 }
 313
 314 #ifdef CONFIG_PM
 315
 316 static int
 317 ohci_hcd_at91_drv_suspend(struct platform_device *pdev, pm_message_t mesg)
 318 {
 319         struct usb_hcd  *hcd = platform_get_drvdata(pdev);
 320         struct ohci_hcd *ohci = hcd_to_ohci(hcd);
 321
 322         if (device_may_wakeup(&pdev->dev))
 323                 enable_irq_wake(hcd->irq);
 324
 325         /*
 326          * The integrated transceivers seem unable to notice disconnect,
 327          * reconnect, or wakeup without the 48 MHz clock active.  so for
 328          * correctness, always discard connection state (using reset).
 329          *
 330          * REVISIT: some boards will be able to turn VBUS off...
 331          */
 332         if (at91_suspend_entering_slow_clock()) {
 333                 ohci_usb_reset (ohci);
 334                 at91_stop_clock();
 335         }
 336
 337         return 0;
 338 }
 339
 340 static int ohci_hcd_at91_drv_resume(struct platform_device *pdev)
 341 {
 342         struct usb_hcd  *hcd = platform_get_drvdata(pdev);
 343
 344         if (device_may_wakeup(&pdev->dev))
 345                 disable_irq_wake(hcd->irq);
 346
 347         if (!clocked)
 348                 at91_start_clock();
 349
 350         ohci_finish_controller_resume(hcd);
 351         return 0;
 352 }
 353 #else
 354 #define ohci_hcd_at91_drv_suspend NULL
 355 #define ohci_hcd_at91_drv_resume  NULL
 356 #endif
 357
 358 MODULE_ALIAS("platform:at91_ohci");
 359
 360 static struct platform_driver ohci_hcd_at91_driver = {
 361         .probe          = ohci_hcd_at91_drv_probe,
 362         .remove         = ohci_hcd_at91_drv_remove,
 363         .shutdown       = usb_hcd_platform_shutdown,
 364         .suspend        = ohci_hcd_at91_drv_suspend,
 365         .resume         = ohci_hcd_at91_drv_resume,
 366         .driver         = {
 367                 .name   = "at91_ohci",
 368                 .owner  = THIS_MODULE,
 369         },
 370 };