drivers/usb/host/ohci-da8xx.c

   1 /*
   2  * OHCI HCD (Host Controller Driver) for USB.
   3  *
   4  * TI DA8xx (OMAP-L1x) Bus Glue
   5  *
   6  * Derived from: ohci-omap.c and ohci-s3c2410.c
   7  * Copyright (C) 2008-2009 MontaVista Software, Inc. <source@mvista.com>
   8  *
   9  * This file is licensed under the terms of the GNU General Public License
  10  * version 2. This program is licensed "as is" without any warranty of any
  11  * kind, whether express or implied.
  12  */
  13
  14 #include <linux/interrupt.h>
  15 #include <linux/jiffies.h>
  16 #include <linux/platform_device.h>
  17 #include <linux/clk.h>
  18
  19 #include <mach/da8xx.h>
  20 #include <linux/platform_data/usb-davinci.h>
  21
  22 #ifndef CONFIG_ARCH_DAVINCI_DA8XX
  23 #error "This file is DA8xx bus glue.  Define CONFIG_ARCH_DAVINCI_DA8XX."
  24 #endif
  25
  26 #define CFGCHIP2        DA8XX_SYSCFG0_VIRT(DA8XX_CFGCHIP2_REG)
  27
  28 static struct clk *usb11_clk;
  29 static struct clk *usb20_clk;
  30
  31 /* Over-current indicator change bitmask */
  32 static volatile u16 ocic_mask;
  33
  34 static void ohci_da8xx_clock(int on)
  35 {
  36         u32 cfgchip2;
  37
  38         cfgchip2 = __raw_readl(CFGCHIP2);
  39         if (on) {
  40                 clk_enable(usb11_clk);
  41
  42                 /*
  43                  * If USB 1.1 reference clock is sourced from USB 2.0 PHY, we
  44                  * need to enable the USB 2.0 module clocking, start its PHY,
  45                  * and not allow it to stop the clock during USB 2.0 suspend.
  46                  */
  47                 if (!(cfgchip2 & CFGCHIP2_USB1PHYCLKMUX)) {
  48                         clk_enable(usb20_clk);
  49
  50                         cfgchip2 &= ~(CFGCHIP2_RESET | CFGCHIP2_PHYPWRDN);
  51                         cfgchip2 |= CFGCHIP2_PHY_PLLON;
  52                         __raw_writel(cfgchip2, CFGCHIP2);
  53
  54                         pr_info("Waiting for USB PHY clock good...\n");
  55                         while (!(__raw_readl(CFGCHIP2) & CFGCHIP2_PHYCLKGD))
  56                                 cpu_relax();
  57                 }
  58
  59                 /* Enable USB 1.1 PHY */
  60                 cfgchip2 |= CFGCHIP2_USB1SUSPENDM;
  61         } else {
  62                 clk_disable(usb11_clk);
  63                 if (!(cfgchip2 & CFGCHIP2_USB1PHYCLKMUX))
  64                         clk_disable(usb20_clk);
  65
  66                 /* Disable USB 1.1 PHY */
  67                 cfgchip2 &= ~CFGCHIP2_USB1SUSPENDM;
  68         }
  69         __raw_writel(cfgchip2, CFGCHIP2);
  70 }
  71
  72 /*
  73  * Handle the port over-current indicator change.
  74  */
  75 static void ohci_da8xx_ocic_handler(struct da8xx_ohci_root_hub *hub,
  76                                     unsigned port)
  77 {
  78         ocic_mask |= 1 << port;
  79
  80         /* Once over-current is detected, the port needs to be powered down */
  81         if (hub->get_oci(port) > 0)
  82                 hub->set_power(port, 0);
  83 }
  84
  85 static int ohci_da8xx_init(struct usb_hcd *hcd)
  86 {
  87         struct device *dev              = hcd->self.controller;
  88         struct da8xx_ohci_root_hub *hub = dev_get_platdata(dev);
  89         struct ohci_hcd *ohci           = hcd_to_ohci(hcd);
  90         int result;
  91         u32 rh_a;
  92
  93         dev_dbg(dev, "starting USB controller\n");
  94
  95         ohci_da8xx_clock(1);
  96
  97         /*
  98          * DA8xx only have 1 port connected to the pins but the HC root hub
  99          * register A reports 2 ports, thus we'll have to override it...
 100          */
 101         ohci->num_ports = 1;
 102
 103         result = ohci_init(ohci);
 104         if (result < 0)
 105                 return result;
 106
 107         /*
 108          * Since we're providing a board-specific root hub port power control
 109          * and over-current reporting, we have to override the HC root hub A
 110          * register's default value, so that ohci_hub_control() could return
 111          * the correct hub descriptor...
 112          */
 113         rh_a = ohci_readl(ohci, &ohci->regs->roothub.a);
 114         if (hub->set_power) {
 115                 rh_a &= ~RH_A_NPS;
 116                 rh_a |=  RH_A_PSM;
 117         }
 118         if (hub->get_oci) {
 119                 rh_a &= ~RH_A_NOCP;
 120                 rh_a |=  RH_A_OCPM;
 121         }
 122         rh_a &= ~RH_A_POTPGT;
 123         rh_a |= hub->potpgt << 24;
 124         ohci_writel(ohci, rh_a, &ohci->regs->roothub.a);
 125
 126         return result;
 127 }
 128
 129 static void ohci_da8xx_stop(struct usb_hcd *hcd)
 130 {
 131         ohci_stop(hcd);
 132         ohci_da8xx_clock(0);
 133 }
 134
 135 static int ohci_da8xx_start(struct usb_hcd *hcd)
 136 {
 137         struct ohci_hcd *ohci           = hcd_to_ohci(hcd);
 138         int result;
 139
 140         result = ohci_run(ohci);
 141         if (result < 0)
 142                 ohci_da8xx_stop(hcd);
 143
 144         return result;
 145 }
 146
 147 /*
 148  * Update the status data from the hub with the over-current indicator change.
 149  */
 150 static int ohci_da8xx_hub_status_data(struct usb_hcd *hcd, char *buf)
 151 {
 152         int length              = ohci_hub_status_data(hcd, buf);
 153
 154         /* See if we have OCIC bit set on port 1 */
 155         if (ocic_mask & (1 << 1)) {
 156                 dev_dbg(hcd->self.controller, "over-current indicator change "
 157                         "on port 1\n");
 158
 159                 if (!length)
 160                         length = 1;
 161
 162                 buf[0] |= 1 << 1;
 163         }
 164         return length;
 165 }
 166
 167 /*
 168  * Look at the control requests to the root hub and see if we need to override.
 169  */
 170 static int ohci_da8xx_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
 171                                   u16 wIndex, char *buf, u16 wLength)
 172 {
 173         struct device *dev              = hcd->self.controller;
 174         struct da8xx_ohci_root_hub *hub = dev_get_platdata(dev);
 175         int temp;
 176
 177         switch (typeReq) {
 178         case GetPortStatus:
 179                 /* Check the port number */
 180                 if (wIndex != 1)
 181                         break;
 182
 183                 dev_dbg(dev, "GetPortStatus(%u)\n", wIndex);
 184
 185                 temp = roothub_portstatus(hcd_to_ohci(hcd), wIndex - 1);
 186
 187                 /* The port power status (PPS) bit defaults to 1 */
 188                 if (hub->get_power && hub->get_power(wIndex) == 0)
 189                         temp &= ~RH_PS_PPS;
 190
 191                 /* The port over-current indicator (POCI) bit is always 0 */
 192                 if (hub->get_oci && hub->get_oci(wIndex) > 0)
 193                         temp |=  RH_PS_POCI;
 194
 195                 /* The over-current indicator change (OCIC) bit is 0 too */
 196                 if (ocic_mask & (1 << wIndex))
 197                         temp |=  RH_PS_OCIC;
 198
 199                 put_unaligned(cpu_to_le32(temp), (__le32 *)buf);
 200                 return 0;
 201         case SetPortFeature:
 202                 temp = 1;
 203                 goto check_port;
 204         case ClearPortFeature:
 205                 temp = 0;
 206
 207 check_port:
 208                 /* Check the port number */
 209                 if (wIndex != 1)
 210                         break;
 211
 212                 switch (wValue) {
 213                 case USB_PORT_FEAT_POWER:
 214                         dev_dbg(dev, "%sPortFeature(%u): %s\n",
 215                                 temp ? "Set" : "Clear", wIndex, "POWER");
 216
 217                         if (!hub->set_power)
 218                                 return -EPIPE;
 219
 220                         return hub->set_power(wIndex, temp) ? -EPIPE : 0;
 221                 case USB_PORT_FEAT_C_OVER_CURRENT:
 222                         dev_dbg(dev, "%sPortFeature(%u): %s\n",
 223                                 temp ? "Set" : "Clear", wIndex,
 224                                 "C_OVER_CURRENT");
 225
 226                         if (temp)
 227                                 ocic_mask |= 1 << wIndex;
 228                         else
 229                                 ocic_mask &= ~(1 << wIndex);
 230                         return 0;
 231                 }
 232         }
 233
 234         return ohci_hub_control(hcd, typeReq, wValue, wIndex, buf, wLength);
 235 }
 236
 237 static const struct hc_driver ohci_da8xx_hc_driver = {
 238         .description            = hcd_name,
 239         .product_desc           = "DA8xx OHCI",
 240         .hcd_priv_size          = sizeof(struct ohci_hcd),
 241
 242         /*
 243          * generic hardware linkage
 244          */
 245         .irq                    = ohci_irq,
 246         .flags                  = HCD_USB11 | HCD_MEMORY,
 247
 248         /*
 249          * basic lifecycle operations
 250          */
 251         .reset                  = ohci_da8xx_init,
 252         .start                  = ohci_da8xx_start,
 253         .stop                   = ohci_da8xx_stop,
 254         .shutdown               = ohci_shutdown,
 255
 256         /*
 257          * managing i/o requests and associated device resources
 258          */
 259         .urb_enqueue            = ohci_urb_enqueue,
 260         .urb_dequeue            = ohci_urb_dequeue,
 261         .endpoint_disable       = ohci_endpoint_disable,
 262
 263         /*
 264          * scheduling support
 265          */
 266         .get_frame_number       = ohci_get_frame,
 267
 268         /*
 269          * root hub support
 270          */
 271         .hub_status_data        = ohci_da8xx_hub_status_data,
 272         .hub_control            = ohci_da8xx_hub_control,
 273
 274 #ifdef  CONFIG_PM
 275         .bus_suspend            = ohci_bus_suspend,
 276         .bus_resume             = ohci_bus_resume,
 277 #endif
 278         .start_port_reset       = ohci_start_port_reset,
 279 };
 280
 281 /*-------------------------------------------------------------------------*/
 282
 283
 284 /**
 285  * usb_hcd_da8xx_probe - initialize DA8xx-based HCDs
 286  * Context: !in_interrupt()
 287  *
 288  * Allocates basic resources for this USB host controller, and
 289  * then invokes the start() method for the HCD associated with it
 290  * through the hotplug entry's driver_data.
 291  */
 292 static int usb_hcd_da8xx_probe(const struct hc_driver *driver,
 293                                struct platform_device *pdev)
 294 {
 295         struct da8xx_ohci_root_hub *hub = dev_get_platdata(&pdev->dev);
 296         struct usb_hcd  *hcd;
 297         struct resource *mem;
 298         int error, irq;
 299
 300         if (hub == NULL)
 301                 return -ENODEV;
 302
 303         usb11_clk = clk_get(&pdev->dev, "usb11");
 304         if (IS_ERR(usb11_clk))
 305                 return PTR_ERR(usb11_clk);
 306
 307         usb20_clk = clk_get(&pdev->dev, "usb20");
 308         if (IS_ERR(usb20_clk)) {
 309                 error = PTR_ERR(usb20_clk);
 310                 goto err0;
 311         }
 312
 313         hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev));
 314         if (!hcd) {
 315                 error = -ENOMEM;
 316                 goto err1;
 317         }
 318
 319         mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 320         if (!mem) {
 321                 error = -ENODEV;
 322                 goto err2;
 323         }
 324         hcd->rsrc_start = mem->start;
 325         hcd->rsrc_len = resource_size(mem);
 326
 327         if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
 328                 dev_dbg(&pdev->dev, "request_mem_region failed\n");
 329                 error = -EBUSY;
 330                 goto err2;
 331         }
 332
 333         hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
 334         if (!hcd->regs) {
 335                 dev_err(&pdev->dev, "ioremap failed\n");
 336                 error = -ENOMEM;
 337                 goto err3;
 338         }
 339
 340         ohci_hcd_init(hcd_to_ohci(hcd));
 341
 342         irq = platform_get_irq(pdev, 0);
 343         if (irq < 0) {
 344                 error = -ENODEV;
 345                 goto err4;
 346         }
 347         error = usb_add_hcd(hcd, irq, 0);
 348         if (error)
 349                 goto err4;
 350
 351         if (hub->ocic_notify) {
 352                 error = hub->ocic_notify(ohci_da8xx_ocic_handler);
 353                 if (!error)
 354                         return 0;
 355         }
 356
 357         usb_remove_hcd(hcd);
 358 err4:
 359         iounmap(hcd->regs);
 360 err3:
 361         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 362 err2:
 363         usb_put_hcd(hcd);
 364 err1:
 365         clk_put(usb20_clk);
 366 err0:
 367         clk_put(usb11_clk);
 368         return error;
 369 }
 370
 371 /**
 372  * usb_hcd_da8xx_remove - shutdown processing for DA8xx-based HCDs
 373  * @dev: USB Host Controller being removed
 374  * Context: !in_interrupt()
 375  *
 376  * Reverses the effect of usb_hcd_da8xx_probe(), first invoking
 377  * the HCD's stop() method.  It is always called from a thread
 378  * context, normally "rmmod", "apmd", or something similar.
 379  */
 380 static inline void
 381 usb_hcd_da8xx_remove(struct usb_hcd *hcd, struct platform_device *pdev)
 382 {
 383         struct da8xx_ohci_root_hub *hub = dev_get_platdata(&pdev->dev);
 384
 385         hub->ocic_notify(NULL);
 386         usb_remove_hcd(hcd);
 387         iounmap(hcd->regs);
 388         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 389         usb_put_hcd(hcd);
 390         clk_put(usb20_clk);
 391         clk_put(usb11_clk);
 392 }
 393
 394 static int ohci_hcd_da8xx_drv_probe(struct platform_device *dev)
 395 {
 396         return usb_hcd_da8xx_probe(&ohci_da8xx_hc_driver, dev);
 397 }
 398
 399 static int ohci_hcd_da8xx_drv_remove(struct platform_device *dev)
 400 {
 401         struct usb_hcd  *hcd = platform_get_drvdata(dev);
 402
 403         usb_hcd_da8xx_remove(hcd, dev);
 404
 405         return 0;
 406 }
 407
 408 #ifdef CONFIG_PM
 409 static int ohci_da8xx_suspend(struct platform_device *dev, pm_message_t message)
 410 {
 411         struct usb_hcd  *hcd    = platform_get_drvdata(dev);
 412         struct ohci_hcd *ohci   = hcd_to_ohci(hcd);
 413
 414         if (time_before(jiffies, ohci->next_statechange))
 415                 msleep(5);
 416         ohci->next_statechange = jiffies;
 417
 418         ohci_da8xx_clock(0);
 419         hcd->state = HC_STATE_SUSPENDED;
 420         dev->dev.power.power_state = PMSG_SUSPEND;
 421         return 0;
 422 }
 423
 424 static int ohci_da8xx_resume(struct platform_device *dev)
 425 {
 426         struct usb_hcd  *hcd    = platform_get_drvdata(dev);
 427         struct ohci_hcd *ohci   = hcd_to_ohci(hcd);
 428
 429         if (time_before(jiffies, ohci->next_statechange))
 430                 msleep(5);
 431         ohci->next_statechange = jiffies;
 432
 433         ohci_da8xx_clock(1);
 434         dev->dev.power.power_state = PMSG_ON;
 435         usb_hcd_resume_root_hub(hcd);
 436         return 0;
 437 }
 438 #endif
 439
 440 /*
 441  * Driver definition to register with platform structure.
 442  */
 443 static struct platform_driver ohci_hcd_da8xx_driver = {
 444         .probe          = ohci_hcd_da8xx_drv_probe,
 445         .remove         = ohci_hcd_da8xx_drv_remove,
 446         .shutdown       = usb_hcd_platform_shutdown,
 447 #ifdef  CONFIG_PM
 448         .suspend        = ohci_da8xx_suspend,
 449         .resume         = ohci_da8xx_resume,
 450 #endif
 451         .driver         = {
 452                 .owner  = THIS_MODULE,
 453                 .name   = "ohci",
 454         },
 455 };
 456
 457 MODULE_ALIAS("platform:ohci");