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>       /* IRQF_DISABLED */
  18 #include <linux/jiffies.h>
  19 #include <linux/platform_device.h>
  20 #include <linux/clk.h>
  21 #include <linux/gpio.h>
  22
  23 #include <mach/hardware.h>
  24 #include <asm/io.h>
  25 #include <asm/mach-types.h>
  26
  27 #include <mach/mux.h>
  28 #include <mach/irqs.h>
  29 #include <mach/fpga.h>
  30 #include <mach/usb.h>
  31
  32
  33 /* OMAP-1510 OHCI has its own MMU for DMA */
  34 #define OMAP1510_LB_MEMSIZE     32      /* Should be same as SDRAM size */
  35 #define OMAP1510_LB_CLOCK_DIV   0xfffec10c
  36 #define OMAP1510_LB_MMU_CTL     0xfffec208
  37 #define OMAP1510_LB_MMU_LCK     0xfffec224
  38 #define OMAP1510_LB_MMU_LD_TLB  0xfffec228
  39 #define OMAP1510_LB_MMU_CAM_H   0xfffec22c
  40 #define OMAP1510_LB_MMU_CAM_L   0xfffec230
  41 #define OMAP1510_LB_MMU_RAM_H   0xfffec234
  42 #define OMAP1510_LB_MMU_RAM_L   0xfffec238
  43
  44
  45 #ifndef CONFIG_ARCH_OMAP
  46 #error "This file is OMAP bus glue.  CONFIG_OMAP must be defined."
  47 #endif
  48
  49 #ifdef CONFIG_TPS65010
  50 #include <linux/i2c/tps65010.h>
  51 #else
  52
  53 #define LOW     0
  54 #define HIGH    1
  55
  56 #define GPIO1   1
  57
  58 static inline int tps65010_set_gpio_out_value(unsigned gpio, unsigned value)
  59 {
  60         return 0;
  61 }
  62
  63 #endif
  64
  65 extern int usb_disabled(void);
  66 extern int ocpi_enable(void);
  67
  68 static struct clk *usb_host_ck;
  69 static struct clk *usb_dc_ck;
  70 static int host_enabled;
  71 static int host_initialized;
  72
  73 static void omap_ohci_clock_power(int on)
  74 {
  75         if (on) {
  76                 clk_enable(usb_dc_ck);
  77                 clk_enable(usb_host_ck);
  78                 /* guesstimate for T5 == 1x 32K clock + APLL lock time */
  79                 udelay(100);
  80         } else {
  81                 clk_disable(usb_host_ck);
  82                 clk_disable(usb_dc_ck);
  83         }
  84 }
  85
  86 /*
  87  * Board specific gang-switched transceiver power on/off.
  88  * NOTE:  OSK supplies power from DC, not battery.
  89  */
  90 static int omap_ohci_transceiver_power(int on)
  91 {
  92         if (on) {
  93                 if (machine_is_omap_innovator() && cpu_is_omap1510())
  94                         fpga_write(fpga_read(INNOVATOR_FPGA_CAM_USB_CONTROL)
  95                                 | ((1 << 5/*usb1*/) | (1 << 3/*usb2*/)),
  96                                INNOVATOR_FPGA_CAM_USB_CONTROL);
  97                 else if (machine_is_omap_osk())
  98                         tps65010_set_gpio_out_value(GPIO1, LOW);
  99         } else {
 100                 if (machine_is_omap_innovator() && cpu_is_omap1510())
 101                         fpga_write(fpga_read(INNOVATOR_FPGA_CAM_USB_CONTROL)
 102                                 & ~((1 << 5/*usb1*/) | (1 << 3/*usb2*/)),
 103                                INNOVATOR_FPGA_CAM_USB_CONTROL);
 104                 else if (machine_is_omap_osk())
 105                         tps65010_set_gpio_out_value(GPIO1, HIGH);
 106         }
 107
 108         return 0;
 109 }
 110
 111 #ifdef CONFIG_ARCH_OMAP15XX
 112 /*
 113  * OMAP-1510 specific Local Bus clock on/off
 114  */
 115 static int omap_1510_local_bus_power(int on)
 116 {
 117         if (on) {
 118                 omap_writel((1 << 1) | (1 << 0), OMAP1510_LB_MMU_CTL);
 119                 udelay(200);
 120         } else {
 121                 omap_writel(0, OMAP1510_LB_MMU_CTL);
 122         }
 123
 124         return 0;
 125 }
 126
 127 /*
 128  * OMAP-1510 specific Local Bus initialization
 129  * NOTE: This assumes 32MB memory size in OMAP1510LB_MEMSIZE.
 130  *       See also arch/mach-omap/memory.h for __virt_to_dma() and
 131  *       __dma_to_virt() which need to match with the physical
 132  *       Local Bus address below.
 133  */
 134 static int omap_1510_local_bus_init(void)
 135 {
 136         unsigned int tlb;
 137         unsigned long lbaddr, physaddr;
 138
 139         omap_writel((omap_readl(OMAP1510_LB_CLOCK_DIV) & 0xfffffff8) | 0x4,
 140                OMAP1510_LB_CLOCK_DIV);
 141
 142         /* Configure the Local Bus MMU table */
 143         for (tlb = 0; tlb < OMAP1510_LB_MEMSIZE; tlb++) {
 144                 lbaddr = tlb * 0x00100000 + OMAP1510_LB_OFFSET;
 145                 physaddr = tlb * 0x00100000 + PHYS_OFFSET;
 146                 omap_writel((lbaddr & 0x0fffffff) >> 22, OMAP1510_LB_MMU_CAM_H);
 147                 omap_writel(((lbaddr & 0x003ffc00) >> 6) | 0xc,
 148                        OMAP1510_LB_MMU_CAM_L);
 149                 omap_writel(physaddr >> 16, OMAP1510_LB_MMU_RAM_H);
 150                 omap_writel((physaddr & 0x0000fc00) | 0x300, OMAP1510_LB_MMU_RAM_L);
 151                 omap_writel(tlb << 4, OMAP1510_LB_MMU_LCK);
 152                 omap_writel(0x1, OMAP1510_LB_MMU_LD_TLB);
 153         }
 154
 155         /* Enable the walking table */
 156         omap_writel(omap_readl(OMAP1510_LB_MMU_CTL) | (1 << 3), OMAP1510_LB_MMU_CTL);
 157         udelay(200);
 158
 159         return 0;
 160 }
 161 #else
 162 #define omap_1510_local_bus_power(x)    {}
 163 #define omap_1510_local_bus_init()      {}
 164 #endif
 165
 166 #ifdef  CONFIG_USB_OTG
 167
 168 static void start_hnp(struct ohci_hcd *ohci)
 169 {
 170         const unsigned  port = ohci_to_hcd(ohci)->self.otg_port - 1;
 171         unsigned long   flags;
 172         u32 l;
 173
 174         otg_start_hnp(ohci->transceiver);
 175
 176         local_irq_save(flags);
 177         ohci->transceiver->state = OTG_STATE_A_SUSPEND;
 178         writel (RH_PS_PSS, &ohci->regs->roothub.portstatus [port]);
 179         l = omap_readl(OTG_CTRL);
 180         l &= ~OTG_A_BUSREQ;
 181         omap_writel(l, OTG_CTRL);
 182         local_irq_restore(flags);
 183 }
 184
 185 #endif
 186
 187 /*-------------------------------------------------------------------------*/
 188
 189 static int ohci_omap_init(struct usb_hcd *hcd)
 190 {
 191         struct ohci_hcd         *ohci = hcd_to_ohci(hcd);
 192         struct omap_usb_config  *config = hcd->self.controller->platform_data;
 193         int                     need_transceiver = (config->otg != 0);
 194         int                     ret;
 195
 196         dev_dbg(hcd->self.controller, "starting USB Controller\n");
 197
 198         if (config->otg) {
 199                 ohci_to_hcd(ohci)->self.otg_port = config->otg;
 200                 /* default/minimum OTG power budget:  8 mA */
 201                 ohci_to_hcd(ohci)->power_budget = 8;
 202         }
 203
 204         /* boards can use OTG transceivers in non-OTG modes */
 205         need_transceiver = need_transceiver
 206                         || machine_is_omap_h2() || machine_is_omap_h3();
 207
 208         if (cpu_is_omap16xx())
 209                 ocpi_enable();
 210
 211 #ifdef  CONFIG_USB_OTG
 212         if (need_transceiver) {
 213                 ohci->transceiver = otg_get_transceiver();
 214                 if (ohci->transceiver) {
 215                         int     status = otg_set_host(ohci->transceiver,
 216                                                 &ohci_to_hcd(ohci)->self);
 217                         dev_dbg(hcd->self.controller, "init %s transceiver, status %d\n",
 218                                         ohci->transceiver->label, status);
 219                         if (status) {
 220                                 if (ohci->transceiver)
 221                                         put_device(ohci->transceiver->dev);
 222                                 return status;
 223                         }
 224                 } else {
 225                         dev_err(hcd->self.controller, "can't find transceiver\n");
 226                         return -ENODEV;
 227                 }
 228                 ohci->start_hnp = start_hnp;
 229         }
 230 #endif
 231
 232         omap_ohci_clock_power(1);
 233
 234         if (cpu_is_omap15xx()) {
 235                 omap_1510_local_bus_power(1);
 236                 omap_1510_local_bus_init();
 237         }
 238
 239         if ((ret = ohci_init(ohci)) < 0)
 240                 return ret;
 241
 242         /* board-specific power switching and overcurrent support */
 243         if (machine_is_omap_osk() || machine_is_omap_innovator()) {
 244                 u32     rh = roothub_a (ohci);
 245
 246                 /* power switching (ganged by default) */
 247                 rh &= ~RH_A_NPS;
 248
 249                 /* TPS2045 switch for internal transceiver (port 1) */
 250                 if (machine_is_omap_osk()) {
 251                         ohci_to_hcd(ohci)->power_budget = 250;
 252
 253                         rh &= ~RH_A_NOCP;
 254
 255                         /* gpio9 for overcurrent detction */
 256                         omap_cfg_reg(W8_1610_GPIO9);
 257                         gpio_request(9, "OHCI overcurrent");
 258                         gpio_direction_input(9);
 259
 260                         /* for paranoia's sake:  disable USB.PUEN */
 261                         omap_cfg_reg(W4_USB_HIGHZ);
 262                 }
 263                 ohci_writel(ohci, rh, &ohci->regs->roothub.a);
 264                 ohci->flags &= ~OHCI_QUIRK_HUB_POWER;
 265         } else if (machine_is_nokia770()) {
 266                 /* We require a self-powered hub, which should have
 267                  * plenty of power. */
 268                 ohci_to_hcd(ohci)->power_budget = 0;
 269         }
 270
 271         /* FIXME khubd hub requests should manage power switching */
 272         omap_ohci_transceiver_power(1);
 273
 274         /* board init will have already handled HMC and mux setup.
 275          * any external transceiver should already be initialized
 276          * too, so all configured ports use the right signaling now.
 277          */
 278
 279         return 0;
 280 }
 281
 282 static void ohci_omap_stop(struct usb_hcd *hcd)
 283 {
 284         dev_dbg(hcd->self.controller, "stopping USB Controller\n");
 285         omap_ohci_clock_power(0);
 286 }
 287
 288
 289 /*-------------------------------------------------------------------------*/
 290
 291 /**
 292  * usb_hcd_omap_probe - initialize OMAP-based HCDs
 293  * Context: !in_interrupt()
 294  *
 295  * Allocates basic resources for this USB host controller, and
 296  * then invokes the start() method for the HCD associated with it
 297  * through the hotplug entry's driver_data.
 298  */
 299 static int usb_hcd_omap_probe (const struct hc_driver *driver,
 300                           struct platform_device *pdev)
 301 {
 302         int retval, irq;
 303         struct usb_hcd *hcd = 0;
 304         struct ohci_hcd *ohci;
 305
 306         if (pdev->num_resources != 2) {
 307                 printk(KERN_ERR "hcd probe: invalid num_resources: %i\n",
 308                        pdev->num_resources);
 309                 return -ENODEV;
 310         }
 311
 312         if (pdev->resource[0].flags != IORESOURCE_MEM
 313                         || pdev->resource[1].flags != IORESOURCE_IRQ) {
 314                 printk(KERN_ERR "hcd probe: invalid resource type\n");
 315                 return -ENODEV;
 316         }
 317
 318         usb_host_ck = clk_get(0, "usb_hhc_ck");
 319         if (IS_ERR(usb_host_ck))
 320                 return PTR_ERR(usb_host_ck);
 321
 322         if (!cpu_is_omap15xx())
 323                 usb_dc_ck = clk_get(0, "usb_dc_ck");
 324         else
 325                 usb_dc_ck = clk_get(0, "lb_ck");
 326
 327         if (IS_ERR(usb_dc_ck)) {
 328                 clk_put(usb_host_ck);
 329                 return PTR_ERR(usb_dc_ck);
 330         }
 331
 332
 333         hcd = usb_create_hcd (driver, &pdev->dev, dev_name(&pdev->dev));
 334         if (!hcd) {
 335                 retval = -ENOMEM;
 336                 goto err0;
 337         }
 338         hcd->rsrc_start = pdev->resource[0].start;
 339         hcd->rsrc_len = pdev->resource[0].end - pdev->resource[0].start + 1;
 340
 341         if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
 342                 dev_dbg(&pdev->dev, "request_mem_region failed\n");
 343                 retval = -EBUSY;
 344                 goto err1;
 345         }
 346
 347         hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
 348         if (!hcd->regs) {
 349                 dev_err(&pdev->dev, "can't ioremap OHCI HCD\n");
 350                 retval = -ENOMEM;
 351                 goto err2;
 352         }
 353
 354         ohci = hcd_to_ohci(hcd);
 355         ohci_hcd_init(ohci);
 356
 357         host_initialized = 0;
 358         host_enabled = 1;
 359
 360         irq = platform_get_irq(pdev, 0);
 361         if (irq < 0) {
 362                 retval = -ENXIO;
 363                 goto err3;
 364         }
 365         retval = usb_add_hcd(hcd, irq, IRQF_DISABLED);
 366         if (retval)
 367                 goto err3;
 368
 369         host_initialized = 1;
 370
 371         if (!host_enabled)
 372                 omap_ohci_clock_power(0);
 373
 374         return 0;
 375 err3:
 376         iounmap(hcd->regs);
 377 err2:
 378         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 379 err1:
 380         usb_put_hcd(hcd);
 381 err0:
 382         clk_put(usb_dc_ck);
 383         clk_put(usb_host_ck);
 384         return retval;
 385 }
 386
 387
 388 /* may be called with controller, bus, and devices active */
 389
 390 /**
 391  * usb_hcd_omap_remove - shutdown processing for OMAP-based HCDs
 392  * @dev: USB Host Controller being removed
 393  * Context: !in_interrupt()
 394  *
 395  * Reverses the effect of usb_hcd_omap_probe(), first invoking
 396  * the HCD's stop() method.  It is always called from a thread
 397  * context, normally "rmmod", "apmd", or something similar.
 398  */
 399 static inline void
 400 usb_hcd_omap_remove (struct usb_hcd *hcd, struct platform_device *pdev)
 401 {
 402         struct ohci_hcd         *ohci = hcd_to_ohci (hcd);
 403
 404         usb_remove_hcd(hcd);
 405         if (ohci->transceiver) {
 406                 (void) otg_set_host(ohci->transceiver, 0);
 407                 put_device(ohci->transceiver->dev);
 408         }
 409         if (machine_is_omap_osk())
 410                 gpio_free(9);
 411         iounmap(hcd->regs);
 412         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 413         usb_put_hcd(hcd);
 414         clk_put(usb_dc_ck);
 415         clk_put(usb_host_ck);
 416 }
 417
 418 /*-------------------------------------------------------------------------*/
 419
 420 static int
 421 ohci_omap_start (struct usb_hcd *hcd)
 422 {
 423         struct omap_usb_config *config;
 424         struct ohci_hcd *ohci = hcd_to_ohci (hcd);
 425         int             ret;
 426
 427         if (!host_enabled)
 428                 return 0;
 429         config = hcd->self.controller->platform_data;
 430         if (config->otg || config->rwc) {
 431                 ohci->hc_control = OHCI_CTRL_RWC;
 432                 writel(OHCI_CTRL_RWC, &ohci->regs->control);
 433         }
 434
 435         if ((ret = ohci_run (ohci)) < 0) {
 436                 dev_err(hcd->self.controller, "can't start\n");
 437                 ohci_stop (hcd);
 438                 return ret;
 439         }
 440         return 0;
 441 }
 442
 443 /*-------------------------------------------------------------------------*/
 444
 445 static const struct hc_driver ohci_omap_hc_driver = {
 446         .description =          hcd_name,
 447         .product_desc =         "OMAP OHCI",
 448         .hcd_priv_size =        sizeof(struct ohci_hcd),
 449
 450         /*
 451          * generic hardware linkage
 452          */
 453         .irq =                  ohci_irq,
 454         .flags =                HCD_USB11 | HCD_MEMORY,
 455
 456         /*
 457          * basic lifecycle operations
 458          */
 459         .reset =                ohci_omap_init,
 460         .start =                ohci_omap_start,
 461         .stop =                 ohci_omap_stop,
 462         .shutdown =             ohci_shutdown,
 463
 464         /*
 465          * managing i/o requests and associated device resources
 466          */
 467         .urb_enqueue =          ohci_urb_enqueue,
 468         .urb_dequeue =          ohci_urb_dequeue,
 469         .endpoint_disable =     ohci_endpoint_disable,
 470
 471         /*
 472          * scheduling support
 473          */
 474         .get_frame_number =     ohci_get_frame,
 475
 476         /*
 477          * root hub support
 478          */
 479         .hub_status_data =      ohci_hub_status_data,
 480         .hub_control =          ohci_hub_control,
 481 #ifdef  CONFIG_PM
 482         .bus_suspend =          ohci_bus_suspend,
 483         .bus_resume =           ohci_bus_resume,
 484 #endif
 485         .start_port_reset =     ohci_start_port_reset,
 486 };
 487
 488 /*-------------------------------------------------------------------------*/
 489
 490 static int ohci_hcd_omap_drv_probe(struct platform_device *dev)
 491 {
 492         return usb_hcd_omap_probe(&ohci_omap_hc_driver, dev);
 493 }
 494
 495 static int ohci_hcd_omap_drv_remove(struct platform_device *dev)
 496 {
 497         struct usb_hcd          *hcd = platform_get_drvdata(dev);
 498
 499         usb_hcd_omap_remove(hcd, dev);
 500         platform_set_drvdata(dev, NULL);
 501
 502         return 0;
 503 }
 504
 505 /*-------------------------------------------------------------------------*/
 506
 507 #ifdef  CONFIG_PM
 508
 509 static int ohci_omap_suspend(struct platform_device *dev, pm_message_t message)
 510 {
 511         struct ohci_hcd *ohci = hcd_to_ohci(platform_get_drvdata(dev));
 512
 513         if (time_before(jiffies, ohci->next_statechange))
 514                 msleep(5);
 515         ohci->next_statechange = jiffies;
 516
 517         omap_ohci_clock_power(0);
 518         ohci_to_hcd(ohci)->state = HC_STATE_SUSPENDED;
 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");