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
  22 #include <asm/hardware.h>
  23 #include <asm/io.h>
  24 #include <asm/mach-types.h>
  25
  26 #include <asm/arch/mux.h>
  27 #include <asm/arch/irqs.h>
  28 #include <asm/arch/gpio.h>
  29 #include <asm/arch/fpga.h>
  30 #include <asm/arch/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
 173         otg_start_hnp(ohci->transceiver);
 174
 175         local_irq_save(flags);
 176         ohci->transceiver->state = OTG_STATE_A_SUSPEND;
 177         writel (RH_PS_PSS, &ohci->regs->roothub.portstatus [port]);
 178         OTG_CTRL_REG &= ~OTG_A_BUSREQ;
 179         local_irq_restore(flags);
 180 }
 181
 182 #endif
 183
 184 /*-------------------------------------------------------------------------*/
 185
 186 static int ohci_omap_init(struct usb_hcd *hcd)
 187 {
 188         struct ohci_hcd         *ohci = hcd_to_ohci(hcd);
 189         struct omap_usb_config  *config = hcd->self.controller->platform_data;
 190         int                     need_transceiver = (config->otg != 0);
 191         int                     ret;
 192
 193         dev_dbg(hcd->self.controller, "starting USB Controller\n");
 194
 195         if (config->otg) {
 196                 ohci_to_hcd(ohci)->self.otg_port = config->otg;
 197                 /* default/minimum OTG power budget:  8 mA */
 198                 ohci_to_hcd(ohci)->power_budget = 8;
 199         }
 200
 201         /* boards can use OTG transceivers in non-OTG modes */
 202         need_transceiver = need_transceiver
 203                         || machine_is_omap_h2() || machine_is_omap_h3();
 204
 205         if (cpu_is_omap16xx())
 206                 ocpi_enable();
 207
 208 #ifdef  CONFIG_ARCH_OMAP_OTG
 209         if (need_transceiver) {
 210                 ohci->transceiver = otg_get_transceiver();
 211                 if (ohci->transceiver) {
 212                         int     status = otg_set_host(ohci->transceiver,
 213                                                 &ohci_to_hcd(ohci)->self);
 214                         dev_dbg(hcd->self.controller, "init %s transceiver, status %d\n",
 215                                         ohci->transceiver->label, status);
 216                         if (status) {
 217                                 if (ohci->transceiver)
 218                                         put_device(ohci->transceiver->dev);
 219                                 return status;
 220                         }
 221                 } else {
 222                         dev_err(hcd->self.controller, "can't find transceiver\n");
 223                         return -ENODEV;
 224                 }
 225         }
 226 #endif
 227
 228         omap_ohci_clock_power(1);
 229
 230         if (cpu_is_omap1510()) {
 231                 omap_1510_local_bus_power(1);
 232                 omap_1510_local_bus_init();
 233         }
 234
 235         if ((ret = ohci_init(ohci)) < 0)
 236                 return ret;
 237
 238         /* board-specific power switching and overcurrent support */
 239         if (machine_is_omap_osk() || machine_is_omap_innovator()) {
 240                 u32     rh = roothub_a (ohci);
 241
 242                 /* power switching (ganged by default) */
 243                 rh &= ~RH_A_NPS;
 244
 245                 /* TPS2045 switch for internal transceiver (port 1) */
 246                 if (machine_is_omap_osk()) {
 247                         ohci_to_hcd(ohci)->power_budget = 250;
 248
 249                         rh &= ~RH_A_NOCP;
 250
 251                         /* gpio9 for overcurrent detction */
 252                         omap_cfg_reg(W8_1610_GPIO9);
 253                         omap_request_gpio(9);
 254                         omap_set_gpio_direction(9, 1 /* IN */);
 255
 256                         /* for paranoia's sake:  disable USB.PUEN */
 257                         omap_cfg_reg(W4_USB_HIGHZ);
 258                 }
 259                 ohci_writel(ohci, rh, &ohci->regs->roothub.a);
 260                 distrust_firmware = 0;
 261         } else if (machine_is_nokia770()) {
 262                 /* We require a self-powered hub, which should have
 263                  * plenty of power. */
 264                 ohci_to_hcd(ohci)->power_budget = 0;
 265         }
 266
 267         /* FIXME khubd hub requests should manage power switching */
 268         omap_ohci_transceiver_power(1);
 269
 270         /* board init will have already handled HMC and mux setup.
 271          * any external transceiver should already be initialized
 272          * too, so all configured ports use the right signaling now.
 273          */
 274
 275         return 0;
 276 }
 277
 278 static void ohci_omap_stop(struct usb_hcd *hcd)
 279 {
 280         dev_dbg(hcd->self.controller, "stopping USB Controller\n");
 281         omap_ohci_clock_power(0);
 282 }
 283
 284
 285 /*-------------------------------------------------------------------------*/
 286
 287 /**
 288  * usb_hcd_omap_probe - initialize OMAP-based HCDs
 289  * Context: !in_interrupt()
 290  *
 291  * Allocates basic resources for this USB host controller, and
 292  * then invokes the start() method for the HCD associated with it
 293  * through the hotplug entry's driver_data.
 294  */
 295 static int usb_hcd_omap_probe (const struct hc_driver *driver,
 296                           struct platform_device *pdev)
 297 {
 298         int retval, irq;
 299         struct usb_hcd *hcd = 0;
 300         struct ohci_hcd *ohci;
 301
 302         if (pdev->num_resources != 2) {
 303                 printk(KERN_ERR "hcd probe: invalid num_resources: %i\n",
 304                        pdev->num_resources);
 305                 return -ENODEV;
 306         }
 307
 308         if (pdev->resource[0].flags != IORESOURCE_MEM
 309                         || pdev->resource[1].flags != IORESOURCE_IRQ) {
 310                 printk(KERN_ERR "hcd probe: invalid resource type\n");
 311                 return -ENODEV;
 312         }
 313
 314         usb_host_ck = clk_get(0, "usb_hhc_ck");
 315         if (IS_ERR(usb_host_ck))
 316                 return PTR_ERR(usb_host_ck);
 317
 318         if (!cpu_is_omap1510())
 319                 usb_dc_ck = clk_get(0, "usb_dc_ck");
 320         else
 321                 usb_dc_ck = clk_get(0, "lb_ck");
 322
 323         if (IS_ERR(usb_dc_ck)) {
 324                 clk_put(usb_host_ck);
 325                 return PTR_ERR(usb_dc_ck);
 326         }
 327
 328
 329         hcd = usb_create_hcd (driver, &pdev->dev, pdev->dev.bus_id);
 330         if (!hcd) {
 331                 retval = -ENOMEM;
 332                 goto err0;
 333         }
 334         hcd->rsrc_start = pdev->resource[0].start;
 335         hcd->rsrc_len = pdev->resource[0].end - pdev->resource[0].start + 1;
 336
 337         if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
 338                 dev_dbg(&pdev->dev, "request_mem_region failed\n");
 339                 retval = -EBUSY;
 340                 goto err1;
 341         }
 342
 343         hcd->regs = (void __iomem *) (int) IO_ADDRESS(hcd->rsrc_start);
 344
 345         ohci = hcd_to_ohci(hcd);
 346         ohci_hcd_init(ohci);
 347
 348         host_initialized = 0;
 349         host_enabled = 1;
 350
 351         irq = platform_get_irq(pdev, 0);
 352         if (irq < 0) {
 353                 retval = -ENXIO;
 354                 goto err2;
 355         }
 356         retval = usb_add_hcd(hcd, irq, IRQF_DISABLED);
 357         if (retval)
 358                 goto err2;
 359
 360         host_initialized = 1;
 361
 362         if (!host_enabled)
 363                 omap_ohci_clock_power(0);
 364
 365         return 0;
 366 err2:
 367         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 368 err1:
 369         usb_put_hcd(hcd);
 370 err0:
 371         clk_put(usb_dc_ck);
 372         clk_put(usb_host_ck);
 373         return retval;
 374 }
 375
 376
 377 /* may be called with controller, bus, and devices active */
 378
 379 /**
 380  * usb_hcd_omap_remove - shutdown processing for OMAP-based HCDs
 381  * @dev: USB Host Controller being removed
 382  * Context: !in_interrupt()
 383  *
 384  * Reverses the effect of usb_hcd_omap_probe(), first invoking
 385  * the HCD's stop() method.  It is always called from a thread
 386  * context, normally "rmmod", "apmd", or something similar.
 387  */
 388 static inline void
 389 usb_hcd_omap_remove (struct usb_hcd *hcd, struct platform_device *pdev)
 390 {
 391         struct ohci_hcd         *ohci = hcd_to_ohci (hcd);
 392
 393         usb_remove_hcd(hcd);
 394         if (ohci->transceiver) {
 395                 (void) otg_set_host(ohci->transceiver, 0);
 396                 put_device(ohci->transceiver->dev);
 397         }
 398         if (machine_is_omap_osk())
 399                 omap_free_gpio(9);
 400         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 401         usb_put_hcd(hcd);
 402         clk_put(usb_dc_ck);
 403         clk_put(usb_host_ck);
 404 }
 405
 406 /*-------------------------------------------------------------------------*/
 407
 408 static int
 409 ohci_omap_start (struct usb_hcd *hcd)
 410 {
 411         struct omap_usb_config *config;
 412         struct ohci_hcd *ohci = hcd_to_ohci (hcd);
 413         int             ret;
 414
 415         if (!host_enabled)
 416                 return 0;
 417         config = hcd->self.controller->platform_data;
 418         if (config->otg || config->rwc) {
 419                 ohci->hc_control = OHCI_CTRL_RWC;
 420                 writel(OHCI_CTRL_RWC, &ohci->regs->control);
 421         }
 422
 423         if ((ret = ohci_run (ohci)) < 0) {
 424                 dev_err(hcd->self.controller, "can't start\n");
 425                 ohci_stop (hcd);
 426                 return ret;
 427         }
 428         return 0;
 429 }
 430
 431 /*-------------------------------------------------------------------------*/
 432
 433 static const struct hc_driver ohci_omap_hc_driver = {
 434         .description =          hcd_name,
 435         .product_desc =         "OMAP OHCI",
 436         .hcd_priv_size =        sizeof(struct ohci_hcd),
 437
 438         /*
 439          * generic hardware linkage
 440          */
 441         .irq =                  ohci_irq,
 442         .flags =                HCD_USB11 | HCD_MEMORY,
 443
 444         /*
 445          * basic lifecycle operations
 446          */
 447         .reset =                ohci_omap_init,
 448         .start =                ohci_omap_start,
 449         .stop =                 ohci_omap_stop,
 450         .shutdown =             ohci_shutdown,
 451
 452         /*
 453          * managing i/o requests and associated device resources
 454          */
 455         .urb_enqueue =          ohci_urb_enqueue,
 456         .urb_dequeue =          ohci_urb_dequeue,
 457         .endpoint_disable =     ohci_endpoint_disable,
 458
 459         /*
 460          * scheduling support
 461          */
 462         .get_frame_number =     ohci_get_frame,
 463
 464         /*
 465          * root hub support
 466          */
 467         .hub_status_data =      ohci_hub_status_data,
 468         .hub_control =          ohci_hub_control,
 469         .hub_irq_enable =       ohci_rhsc_enable,
 470 #ifdef  CONFIG_PM
 471         .bus_suspend =          ohci_bus_suspend,
 472         .bus_resume =           ohci_bus_resume,
 473 #endif
 474         .start_port_reset =     ohci_start_port_reset,
 475 };
 476
 477 /*-------------------------------------------------------------------------*/
 478
 479 static int ohci_hcd_omap_drv_probe(struct platform_device *dev)
 480 {
 481         return usb_hcd_omap_probe(&ohci_omap_hc_driver, dev);
 482 }
 483
 484 static int ohci_hcd_omap_drv_remove(struct platform_device *dev)
 485 {
 486         struct usb_hcd          *hcd = platform_get_drvdata(dev);
 487
 488         usb_hcd_omap_remove(hcd, dev);
 489         platform_set_drvdata(dev, NULL);
 490
 491         return 0;
 492 }
 493
 494 /*-------------------------------------------------------------------------*/
 495
 496 #ifdef  CONFIG_PM
 497
 498 static int ohci_omap_suspend(struct platform_device *dev, pm_message_t message)
 499 {
 500         struct ohci_hcd *ohci = hcd_to_ohci(platform_get_drvdata(dev));
 501
 502         if (time_before(jiffies, ohci->next_statechange))
 503                 msleep(5);
 504         ohci->next_statechange = jiffies;
 505
 506         omap_ohci_clock_power(0);
 507         ohci_to_hcd(ohci)->state = HC_STATE_SUSPENDED;
 508         dev->dev.power.power_state = PMSG_SUSPEND;
 509         return 0;
 510 }
 511
 512 static int ohci_omap_resume(struct platform_device *dev)
 513 {
 514         struct ohci_hcd *ohci = hcd_to_ohci(platform_get_drvdata(dev));
 515
 516         if (time_before(jiffies, ohci->next_statechange))
 517                 msleep(5);
 518         ohci->next_statechange = jiffies;
 519
 520         omap_ohci_clock_power(1);
 521         dev->dev.power.power_state = PMSG_ON;
 522         usb_hcd_resume_root_hub(platform_get_drvdata(dev));
 523         return 0;
 524 }
 525
 526 #endif
 527
 528 /*-------------------------------------------------------------------------*/
 529
 530 /*
 531  * Driver definition to register with the OMAP bus
 532  */
 533 static struct platform_driver ohci_hcd_omap_driver = {
 534         .probe          = ohci_hcd_omap_drv_probe,
 535         .remove         = ohci_hcd_omap_drv_remove,
 536         .shutdown       = usb_hcd_platform_shutdown,
 537 #ifdef  CONFIG_PM
 538         .suspend        = ohci_omap_suspend,
 539         .resume         = ohci_omap_resume,
 540 #endif
 541         .driver         = {
 542                 .owner  = THIS_MODULE,
 543                 .name   = "ohci",
 544         },
 545 };
 546