drivers/usb/host/ohci-omap.c

   1 /*
   2  * OHCI HCD (Host Controller Driver) for USB.
   3  *
   4  * (C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at>
   5  * (C) Copyright 2000-2005 David Brownell
   6  * (C) Copyright 2002 Hewlett-Packard Company
   7  *
   8  * OMAP Bus Glue
   9  *
  10  * Modified for OMAP by Tony Lindgren <tony@atomide.com>
  11  * Based on the 2.4 OMAP OHCI driver originally done by MontaVista Software Inc.
  12  * and on ohci-sa1111.c by Christopher Hoover <ch@hpl.hp.com>
  13  *
  14  * This file is licenced under the GPL.
  15  */
  16
  17 #include <linux/signal.h>
  18 #include <linux/jiffies.h>
  19 #include <linux/platform_device.h>
  20 #include <linux/clk.h>
  21 #include <linux/err.h>
  22 #include <linux/gpio.h>
  23
  24 #include <asm/io.h>
  25 #include <asm/mach-types.h>
  26
  27 #include <mach/mux.h>
  28
  29 #include <mach/hardware.h>
  30 #include <mach/irqs.h>
  31 #include <mach/usb.h>
  32
  33
  34 /* OMAP-1510 OHCI has its own MMU for DMA */
  35 #define OMAP1510_LB_MEMSIZE     32      /* Should be same as SDRAM size */
  36 #define OMAP1510_LB_CLOCK_DIV   0xfffec10c
  37 #define OMAP1510_LB_MMU_CTL     0xfffec208
  38 #define OMAP1510_LB_MMU_LCK     0xfffec224
  39 #define OMAP1510_LB_MMU_LD_TLB  0xfffec228
  40 #define OMAP1510_LB_MMU_CAM_H   0xfffec22c
  41 #define OMAP1510_LB_MMU_CAM_L   0xfffec230
  42 #define OMAP1510_LB_MMU_RAM_H   0xfffec234
  43 #define OMAP1510_LB_MMU_RAM_L   0xfffec238
  44
  45
  46 #ifndef CONFIG_ARCH_OMAP
  47 #error "This file is OMAP bus glue.  CONFIG_OMAP must be defined."
  48 #endif
  49
  50 #ifdef CONFIG_TPS65010
  51 #include <linux/i2c/tps65010.h>
  52 #else
  53
  54 #define LOW     0
  55 #define HIGH    1
  56
  57 #define GPIO1   1
  58
  59 static inline int tps65010_set_gpio_out_value(unsigned gpio, unsigned value)
  60 {
  61         return 0;
  62 }
  63
  64 #endif
  65
  66 extern int usb_disabled(void);
  67 extern int ocpi_enable(void);
  68
  69 static struct clk *usb_host_ck;
  70 static struct clk *usb_dc_ck;
  71 static int host_enabled;
  72 static int host_initialized;
  73
  74 static void omap_ohci_clock_power(int on)
  75 {
  76         if (on) {
  77                 clk_enable(usb_dc_ck);
  78                 clk_enable(usb_host_ck);
  79                 /* guesstimate for T5 == 1x 32K clock + APLL lock time */
  80                 udelay(100);
  81         } else {
  82                 clk_disable(usb_host_ck);
  83                 clk_disable(usb_dc_ck);
  84         }
  85 }
  86
  87 /*
  88  * Board specific gang-switched transceiver power on/off.
  89  * NOTE:  OSK supplies power from DC, not battery.
  90  */
  91 static int omap_ohci_transceiver_power(int on)
  92 {
  93         if (on) {
  94                 if (machine_is_omap_innovator() && cpu_is_omap1510())
  95                         __raw_writeb(__raw_readb(INNOVATOR_FPGA_CAM_USB_CONTROL)
  96                                 | ((1 << 5/*usb1*/) | (1 << 3/*usb2*/)),
  97                                INNOVATOR_FPGA_CAM_USB_CONTROL);
  98                 else if (machine_is_omap_osk())
  99                         tps65010_set_gpio_out_value(GPIO1, LOW);
 100         } else {
 101                 if (machine_is_omap_innovator() && cpu_is_omap1510())
 102                         __raw_writeb(__raw_readb(INNOVATOR_FPGA_CAM_USB_CONTROL)
 103                                 & ~((1 << 5/*usb1*/) | (1 << 3/*usb2*/)),
 104                                INNOVATOR_FPGA_CAM_USB_CONTROL);
 105                 else if (machine_is_omap_osk())
 106                         tps65010_set_gpio_out_value(GPIO1, HIGH);
 107         }
 108
 109         return 0;
 110 }
 111
 112 #ifdef CONFIG_ARCH_OMAP15XX
 113 /*
 114  * OMAP-1510 specific Local Bus clock on/off
 115  */
 116 static int omap_1510_local_bus_power(int on)
 117 {
 118         if (on) {
 119                 omap_writel((1 << 1) | (1 << 0), OMAP1510_LB_MMU_CTL);
 120                 udelay(200);
 121         } else {
 122                 omap_writel(0, OMAP1510_LB_MMU_CTL);
 123         }
 124
 125         return 0;
 126 }
 127
 128 /*
 129  * OMAP-1510 specific Local Bus initialization
 130  * NOTE: This assumes 32MB memory size in OMAP1510LB_MEMSIZE.
 131  *       See also arch/mach-omap/memory.h for __virt_to_dma() and
 132  *       __dma_to_virt() which need to match with the physical
 133  *       Local Bus address below.
 134  */
 135 static int omap_1510_local_bus_init(void)
 136 {
 137         unsigned int tlb;
 138         unsigned long lbaddr, physaddr;
 139
 140         omap_writel((omap_readl(OMAP1510_LB_CLOCK_DIV) & 0xfffffff8) | 0x4,
 141                OMAP1510_LB_CLOCK_DIV);
 142
 143         /* Configure the Local Bus MMU table */
 144         for (tlb = 0; tlb < OMAP1510_LB_MEMSIZE; tlb++) {
 145                 lbaddr = tlb * 0x00100000 + OMAP1510_LB_OFFSET;
 146                 physaddr = tlb * 0x00100000 + PHYS_OFFSET;
 147                 omap_writel((lbaddr & 0x0fffffff) >> 22, OMAP1510_LB_MMU_CAM_H);
 148                 omap_writel(((lbaddr & 0x003ffc00) >> 6) | 0xc,
 149                        OMAP1510_LB_MMU_CAM_L);
 150                 omap_writel(physaddr >> 16, OMAP1510_LB_MMU_RAM_H);
 151                 omap_writel((physaddr & 0x0000fc00) | 0x300, OMAP1510_LB_MMU_RAM_L);
 152                 omap_writel(tlb << 4, OMAP1510_LB_MMU_LCK);
 153                 omap_writel(0x1, OMAP1510_LB_MMU_LD_TLB);
 154         }
 155
 156         /* Enable the walking table */
 157         omap_writel(omap_readl(OMAP1510_LB_MMU_CTL) | (1 << 3), OMAP1510_LB_MMU_CTL);
 158         udelay(200);
 159
 160         return 0;
 161 }
 162 #else
 163 #define omap_1510_local_bus_power(x)    {}
 164 #define omap_1510_local_bus_init()      {}
 165 #endif
 166
 167 #ifdef  CONFIG_USB_OTG
 168
 169 static void start_hnp(struct ohci_hcd *ohci)
 170 {
 171         struct usb_hcd *hcd = ohci_to_hcd(ohci);
 172         const unsigned  port = hcd->self.otg_port - 1;
 173         unsigned long   flags;
 174         u32 l;
 175
 176         otg_start_hnp(hcd->phy->otg);
 177
 178         local_irq_save(flags);
 179         hcd->phy->state = OTG_STATE_A_SUSPEND;
 180         writel (RH_PS_PSS, &ohci->regs->roothub.portstatus [port]);
 181         l = omap_readl(OTG_CTRL);
 182         l &= ~OTG_A_BUSREQ;
 183         omap_writel(l, OTG_CTRL);
 184         local_irq_restore(flags);
 185 }
 186
 187 #endif
 188
 189 /*-------------------------------------------------------------------------*/
 190
 191 static int ohci_omap_init(struct usb_hcd *hcd)
 192 {
 193         struct ohci_hcd         *ohci = hcd_to_ohci(hcd);
 194         struct omap_usb_config  *config = hcd->self.controller->platform_data;
 195         int                     need_transceiver = (config->otg != 0);
 196         int                     ret;
 197
 198         dev_dbg(hcd->self.controller, "starting USB Controller\n");
 199
 200         if (config->otg) {
 201                 ohci_to_hcd(ohci)->self.otg_port = config->otg;
 202                 /* default/minimum OTG power budget:  8 mA */
 203                 ohci_to_hcd(ohci)->power_budget = 8;
 204         }
 205
 206         /* boards can use OTG transceivers in non-OTG modes */
 207         need_transceiver = need_transceiver
 208                         || machine_is_omap_h2() || machine_is_omap_h3();
 209
 210         /* XXX OMAP16xx only */
 211         if (config->ocpi_enable)
 212                 config->ocpi_enable();
 213
 214 #ifdef  CONFIG_USB_OTG
 215         if (need_transceiver) {
 216                 hcd->phy = usb_get_phy(USB_PHY_TYPE_USB2);
 217                 if (!IS_ERR_OR_NULL(hcd->phy)) {
 218                         int     status = otg_set_host(hcd->phy->otg,
 219                                                 &ohci_to_hcd(ohci)->self);
 220                         dev_dbg(hcd->self.controller, "init %s phy, status %d\n",
 221                                         hcd->phy->label, status);
 222                         if (status) {
 223                                 usb_put_phy(hcd->phy);
 224                                 return status;
 225                         }
 226                 } else {
 227                         dev_err(hcd->self.controller, "can't find phy\n");
 228                         return -ENODEV;
 229                 }
 230                 ohci->start_hnp = start_hnp;
 231         }
 232 #endif
 233
 234         omap_ohci_clock_power(1);
 235
 236         if (cpu_is_omap15xx()) {
 237                 omap_1510_local_bus_power(1);
 238                 omap_1510_local_bus_init();
 239         }
 240
 241         if ((ret = ohci_init(ohci)) < 0)
 242                 return ret;
 243
 244         /* board-specific power switching and overcurrent support */
 245         if (machine_is_omap_osk() || machine_is_omap_innovator()) {
 246                 u32     rh = roothub_a (ohci);
 247
 248                 /* power switching (ganged by default) */
 249                 rh &= ~RH_A_NPS;
 250
 251                 /* TPS2045 switch for internal transceiver (port 1) */
 252                 if (machine_is_omap_osk()) {
 253                         ohci_to_hcd(ohci)->power_budget = 250;
 254
 255                         rh &= ~RH_A_NOCP;
 256
 257                         /* gpio9 for overcurrent detction */
 258                         omap_cfg_reg(W8_1610_GPIO9);
 259                         gpio_request(9, "OHCI overcurrent");
 260                         gpio_direction_input(9);
 261
 262                         /* for paranoia's sake:  disable USB.PUEN */
 263                         omap_cfg_reg(W4_USB_HIGHZ);
 264                 }
 265                 ohci_writel(ohci, rh, &ohci->regs->roothub.a);
 266                 ohci->flags &= ~OHCI_QUIRK_HUB_POWER;
 267         } else if (machine_is_nokia770()) {
 268                 /* We require a self-powered hub, which should have
 269                  * plenty of power. */
 270                 ohci_to_hcd(ohci)->power_budget = 0;
 271         }
 272
 273         /* FIXME khubd hub requests should manage power switching */
 274         omap_ohci_transceiver_power(1);
 275
 276         /* board init will have already handled HMC and mux setup.
 277          * any external transceiver should already be initialized
 278          * too, so all configured ports use the right signaling now.
 279          */
 280
 281         return 0;
 282 }
 283
 284 static void ohci_omap_stop(struct usb_hcd *hcd)
 285 {
 286         dev_dbg(hcd->self.controller, "stopping USB Controller\n");
 287         ohci_stop(hcd);
 288         omap_ohci_clock_power(0);
 289 }
 290
 291
 292 /*-------------------------------------------------------------------------*/
 293
 294 /**
 295  * usb_hcd_omap_probe - initialize OMAP-based HCDs
 296  * Context: !in_interrupt()
 297  *
 298  * Allocates basic resources for this USB host controller, and
 299  * then invokes the start() method for the HCD associated with it
 300  * through the hotplug entry's driver_data.
 301  */
 302 static int usb_hcd_omap_probe (const struct hc_driver *driver,
 303                           struct platform_device *pdev)
 304 {
 305         int retval, irq;
 306         struct usb_hcd *hcd = 0;
 307         struct ohci_hcd *ohci;
 308
 309         if (pdev->num_resources != 2) {
 310                 printk(KERN_ERR "hcd probe: invalid num_resources: %i\n",
 311                        pdev->num_resources);
 312                 return -ENODEV;
 313         }
 314
 315         if (pdev->resource[0].flags != IORESOURCE_MEM
 316                         || pdev->resource[1].flags != IORESOURCE_IRQ) {
 317                 printk(KERN_ERR "hcd probe: invalid resource type\n");
 318                 return -ENODEV;
 319         }
 320
 321         usb_host_ck = clk_get(&pdev->dev, "usb_hhc_ck");
 322         if (IS_ERR(usb_host_ck))
 323                 return PTR_ERR(usb_host_ck);
 324
 325         if (!cpu_is_omap15xx())
 326                 usb_dc_ck = clk_get(&pdev->dev, "usb_dc_ck");
 327         else
 328                 usb_dc_ck = clk_get(&pdev->dev, "lb_ck");
 329
 330         if (IS_ERR(usb_dc_ck)) {
 331                 clk_put(usb_host_ck);
 332                 return PTR_ERR(usb_dc_ck);
 333         }
 334
 335
 336         hcd = usb_create_hcd (driver, &pdev->dev, dev_name(&pdev->dev));
 337         if (!hcd) {
 338                 retval = -ENOMEM;
 339                 goto err0;
 340         }
 341         hcd->rsrc_start = pdev->resource[0].start;
 342         hcd->rsrc_len = pdev->resource[0].end - pdev->resource[0].start + 1;
 343
 344         if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
 345                 dev_dbg(&pdev->dev, "request_mem_region failed\n");
 346                 retval = -EBUSY;
 347                 goto err1;
 348         }
 349
 350         hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
 351         if (!hcd->regs) {
 352                 dev_err(&pdev->dev, "can't ioremap OHCI HCD\n");
 353                 retval = -ENOMEM;
 354                 goto err2;
 355         }
 356
 357         ohci = hcd_to_ohci(hcd);
 358         ohci_hcd_init(ohci);
 359
 360         host_initialized = 0;
 361         host_enabled = 1;
 362
 363         irq = platform_get_irq(pdev, 0);
 364         if (irq < 0) {
 365                 retval = -ENXIO;
 366                 goto err3;
 367         }
 368         retval = usb_add_hcd(hcd, irq, 0);
 369         if (retval)
 370                 goto err3;
 371
 372         host_initialized = 1;
 373
 374         if (!host_enabled)
 375                 omap_ohci_clock_power(0);
 376
 377         return 0;
 378 err3:
 379         iounmap(hcd->regs);
 380 err2:
 381         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 382 err1:
 383         usb_put_hcd(hcd);
 384 err0:
 385         clk_put(usb_dc_ck);
 386         clk_put(usb_host_ck);
 387         return retval;
 388 }
 389
 390
 391 /* may be called with controller, bus, and devices active */
 392
 393 /**
 394  * usb_hcd_omap_remove - shutdown processing for OMAP-based HCDs
 395  * @dev: USB Host Controller being removed
 396  * Context: !in_interrupt()
 397  *
 398  * Reverses the effect of usb_hcd_omap_probe(), first invoking
 399  * the HCD's stop() method.  It is always called from a thread
 400  * context, normally "rmmod", "apmd", or something similar.
 401  */
 402 static inline void
 403 usb_hcd_omap_remove (struct usb_hcd *hcd, struct platform_device *pdev)
 404 {
 405         usb_remove_hcd(hcd);
 406         if (!IS_ERR_OR_NULL(hcd->phy)) {
 407                 (void) otg_set_host(hcd->phy->otg, 0);
 408                 usb_put_phy(hcd->phy);
 409         }
 410         if (machine_is_omap_osk())
 411                 gpio_free(9);
 412         iounmap(hcd->regs);
 413         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 414         usb_put_hcd(hcd);
 415         clk_put(usb_dc_ck);
 416         clk_put(usb_host_ck);
 417 }
 418
 419 /*-------------------------------------------------------------------------*/
 420
 421 static int
 422 ohci_omap_start (struct usb_hcd *hcd)
 423 {
 424         struct omap_usb_config *config;
 425         struct ohci_hcd *ohci = hcd_to_ohci (hcd);
 426         int             ret;
 427
 428         if (!host_enabled)
 429                 return 0;
 430         config = hcd->self.controller->platform_data;
 431         if (config->otg || config->rwc) {
 432                 ohci->hc_control = OHCI_CTRL_RWC;
 433                 writel(OHCI_CTRL_RWC, &ohci->regs->control);
 434         }
 435
 436         if ((ret = ohci_run (ohci)) < 0) {
 437                 dev_err(hcd->self.controller, "can't start\n");
 438                 ohci_stop (hcd);
 439                 return ret;
 440         }
 441         return 0;
 442 }
 443
 444 /*-------------------------------------------------------------------------*/
 445
 446 static const struct hc_driver ohci_omap_hc_driver = {
 447         .description =          hcd_name,
 448         .product_desc =         "OMAP OHCI",
 449         .hcd_priv_size =        sizeof(struct ohci_hcd),
 450
 451         /*
 452          * generic hardware linkage
 453          */
 454         .irq =                  ohci_irq,
 455         .flags =                HCD_USB11 | HCD_MEMORY,
 456
 457         /*
 458          * basic lifecycle operations
 459          */
 460         .reset =                ohci_omap_init,
 461         .start =                ohci_omap_start,
 462         .stop =                 ohci_omap_stop,
 463         .shutdown =             ohci_shutdown,
 464
 465         /*
 466          * managing i/o requests and associated device resources
 467          */
 468         .urb_enqueue =          ohci_urb_enqueue,
 469         .urb_dequeue =          ohci_urb_dequeue,
 470         .endpoint_disable =     ohci_endpoint_disable,
 471
 472         /*
 473          * scheduling support
 474          */
 475         .get_frame_number =     ohci_get_frame,
 476
 477         /*
 478          * root hub support
 479          */
 480         .hub_status_data =      ohci_hub_status_data,
 481         .hub_control =          ohci_hub_control,
 482 #ifdef  CONFIG_PM
 483         .bus_suspend =          ohci_bus_suspend,
 484         .bus_resume =           ohci_bus_resume,
 485 #endif
 486         .start_port_reset =     ohci_start_port_reset,
 487 };
 488
 489 /*-------------------------------------------------------------------------*/
 490
 491 static int ohci_hcd_omap_drv_probe(struct platform_device *dev)
 492 {
 493         return usb_hcd_omap_probe(&ohci_omap_hc_driver, dev);
 494 }
 495
 496 static int ohci_hcd_omap_drv_remove(struct platform_device *dev)
 497 {
 498         struct usb_hcd          *hcd = platform_get_drvdata(dev);
 499
 500         usb_hcd_omap_remove(hcd, dev);
 501         platform_set_drvdata(dev, NULL);
 502
 503         return 0;
 504 }
 505
 506 /*-------------------------------------------------------------------------*/
 507
 508 #ifdef  CONFIG_PM
 509
 510 static int ohci_omap_suspend(struct platform_device *dev, pm_message_t message)
 511 {
 512         struct ohci_hcd *ohci = hcd_to_ohci(platform_get_drvdata(dev));
 513
 514         if (time_before(jiffies, ohci->next_statechange))
 515                 msleep(5);
 516         ohci->next_statechange = jiffies;
 517
 518         omap_ohci_clock_power(0);
 519         return 0;
 520 }
 521
 522 static int ohci_omap_resume(struct platform_device *dev)
 523 {
 524         struct usb_hcd  *hcd = platform_get_drvdata(dev);
 525         struct ohci_hcd *ohci = hcd_to_ohci(hcd);
 526
 527         if (time_before(jiffies, ohci->next_statechange))
 528                 msleep(5);
 529         ohci->next_statechange = jiffies;
 530
 531         omap_ohci_clock_power(1);
 532         ohci_finish_controller_resume(hcd);
 533         return 0;
 534 }
 535
 536 #endif
 537
 538 /*-------------------------------------------------------------------------*/
 539
 540 /*
 541  * Driver definition to register with the OMAP bus
 542  */
 543 static struct platform_driver ohci_hcd_omap_driver = {
 544         .probe          = ohci_hcd_omap_drv_probe,
 545         .remove         = ohci_hcd_omap_drv_remove,
 546         .shutdown       = usb_hcd_platform_shutdown,
 547 #ifdef  CONFIG_PM
 548         .suspend        = ohci_omap_suspend,
 549         .resume         = ohci_omap_resume,
 550 #endif
 551         .driver         = {
 552                 .owner  = THIS_MODULE,
 553                 .name   = "ohci",
 554         },
 555 };
 556
 557 MODULE_ALIAS("platform:ohci");