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/clk.h>
  18 #include <linux/dma-mapping.h>
  19 #include <linux/err.h>
  20 #include <linux/gpio.h>
  21 #include <linux/io.h>
  22 #include <linux/jiffies.h>
  23 #include <linux/kernel.h>
  24 #include <linux/module.h>
  25 #include <linux/usb/otg.h>
  26 #include <linux/platform_device.h>
  27 #include <linux/signal.h>
  28 #include <linux/usb.h>
  29 #include <linux/usb/hcd.h>
  30
  31 #include "ohci.h"
  32
  33 #include <asm/io.h>
  34 #include <asm/mach-types.h>
  35
  36 #include <mach/mux.h>
  37
  38 #include <mach/hardware.h>
  39 #include <mach/usb.h>
  40
  41
  42 /* OMAP-1510 OHCI has its own MMU for DMA */
  43 #define OMAP1510_LB_MEMSIZE     32      /* Should be same as SDRAM size */
  44 #define OMAP1510_LB_CLOCK_DIV   0xfffec10c
  45 #define OMAP1510_LB_MMU_CTL     0xfffec208
  46 #define OMAP1510_LB_MMU_LCK     0xfffec224
  47 #define OMAP1510_LB_MMU_LD_TLB  0xfffec228
  48 #define OMAP1510_LB_MMU_CAM_H   0xfffec22c
  49 #define OMAP1510_LB_MMU_CAM_L   0xfffec230
  50 #define OMAP1510_LB_MMU_RAM_H   0xfffec234
  51 #define OMAP1510_LB_MMU_RAM_L   0xfffec238
  52
  53 #define DRIVER_DESC "OHCI OMAP driver"
  54
  55 #ifdef CONFIG_TPS65010
  56 #include <linux/i2c/tps65010.h>
  57 #else
  58
  59 #define LOW     0
  60 #define HIGH    1
  61
  62 #define GPIO1   1
  63
  64 static inline int tps65010_set_gpio_out_value(unsigned gpio, unsigned value)
  65 {
  66         return 0;
  67 }
  68
  69 #endif
  70
  71 static struct clk *usb_host_ck;
  72 static struct clk *usb_dc_ck;
  73
  74 static const char hcd_name[] = "ohci-omap";
  75 static struct hc_driver __read_mostly ohci_omap_hc_driver;
  76
  77 static void omap_ohci_clock_power(int on)
  78 {
  79         if (on) {
  80                 clk_enable(usb_dc_ck);
  81                 clk_enable(usb_host_ck);
  82                 /* guesstimate for T5 == 1x 32K clock + APLL lock time */
  83                 udelay(100);
  84         } else {
  85                 clk_disable(usb_host_ck);
  86                 clk_disable(usb_dc_ck);
  87         }
  88 }
  89
  90 /*
  91  * Board specific gang-switched transceiver power on/off.
  92  * NOTE:  OSK supplies power from DC, not battery.
  93  */
  94 static int omap_ohci_transceiver_power(int on)
  95 {
  96         if (on) {
  97                 if (machine_is_omap_innovator() && cpu_is_omap1510())
  98                         __raw_writeb(__raw_readb(INNOVATOR_FPGA_CAM_USB_CONTROL)
  99                                 | ((1 << 5/*usb1*/) | (1 << 3/*usb2*/)),
 100                                INNOVATOR_FPGA_CAM_USB_CONTROL);
 101                 else if (machine_is_omap_osk())
 102                         tps65010_set_gpio_out_value(GPIO1, LOW);
 103         } else {
 104                 if (machine_is_omap_innovator() && cpu_is_omap1510())
 105                         __raw_writeb(__raw_readb(INNOVATOR_FPGA_CAM_USB_CONTROL)
 106                                 & ~((1 << 5/*usb1*/) | (1 << 3/*usb2*/)),
 107                                INNOVATOR_FPGA_CAM_USB_CONTROL);
 108                 else if (machine_is_omap_osk())
 109                         tps65010_set_gpio_out_value(GPIO1, HIGH);
 110         }
 111
 112         return 0;
 113 }
 114
 115 #ifdef CONFIG_ARCH_OMAP15XX
 116 /*
 117  * OMAP-1510 specific Local Bus clock on/off
 118  */
 119 static int omap_1510_local_bus_power(int on)
 120 {
 121         if (on) {
 122                 omap_writel((1 << 1) | (1 << 0), OMAP1510_LB_MMU_CTL);
 123                 udelay(200);
 124         } else {
 125                 omap_writel(0, OMAP1510_LB_MMU_CTL);
 126         }
 127
 128         return 0;
 129 }
 130
 131 /*
 132  * OMAP-1510 specific Local Bus initialization
 133  * NOTE: This assumes 32MB memory size in OMAP1510LB_MEMSIZE.
 134  *       See also arch/mach-omap/memory.h for __virt_to_dma() and
 135  *       __dma_to_virt() which need to match with the physical
 136  *       Local Bus address below.
 137  */
 138 static int omap_1510_local_bus_init(void)
 139 {
 140         unsigned int tlb;
 141         unsigned long lbaddr, physaddr;
 142
 143         omap_writel((omap_readl(OMAP1510_LB_CLOCK_DIV) & 0xfffffff8) | 0x4,
 144                OMAP1510_LB_CLOCK_DIV);
 145
 146         /* Configure the Local Bus MMU table */
 147         for (tlb = 0; tlb < OMAP1510_LB_MEMSIZE; tlb++) {
 148                 lbaddr = tlb * 0x00100000 + OMAP1510_LB_OFFSET;
 149                 physaddr = tlb * 0x00100000 + PHYS_OFFSET;
 150                 omap_writel((lbaddr & 0x0fffffff) >> 22, OMAP1510_LB_MMU_CAM_H);
 151                 omap_writel(((lbaddr & 0x003ffc00) >> 6) | 0xc,
 152                        OMAP1510_LB_MMU_CAM_L);
 153                 omap_writel(physaddr >> 16, OMAP1510_LB_MMU_RAM_H);
 154                 omap_writel((physaddr & 0x0000fc00) | 0x300, OMAP1510_LB_MMU_RAM_L);
 155                 omap_writel(tlb << 4, OMAP1510_LB_MMU_LCK);
 156                 omap_writel(0x1, OMAP1510_LB_MMU_LD_TLB);
 157         }
 158
 159         /* Enable the walking table */
 160         omap_writel(omap_readl(OMAP1510_LB_MMU_CTL) | (1 << 3), OMAP1510_LB_MMU_CTL);
 161         udelay(200);
 162
 163         return 0;
 164 }
 165 #else
 166 #define omap_1510_local_bus_power(x)    {}
 167 #define omap_1510_local_bus_init()      {}
 168 #endif
 169
 170 #ifdef  CONFIG_USB_OTG
 171
 172 static void start_hnp(struct ohci_hcd *ohci)
 173 {
 174         struct usb_hcd *hcd = ohci_to_hcd(ohci);
 175         const unsigned  port = hcd->self.otg_port - 1;
 176         unsigned long   flags;
 177         u32 l;
 178
 179         otg_start_hnp(hcd->usb_phy->otg);
 180
 181         local_irq_save(flags);
 182         hcd->usb_phy->otg->state = OTG_STATE_A_SUSPEND;
 183         writel (RH_PS_PSS, &ohci->regs->roothub.portstatus [port]);
 184         l = omap_readl(OTG_CTRL);
 185         l &= ~OTG_A_BUSREQ;
 186         omap_writel(l, OTG_CTRL);
 187         local_irq_restore(flags);
 188 }
 189
 190 #endif
 191
 192 /*-------------------------------------------------------------------------*/
 193
 194 static int ohci_omap_reset(struct usb_hcd *hcd)
 195 {
 196         struct ohci_hcd         *ohci = hcd_to_ohci(hcd);
 197         struct omap_usb_config  *config = dev_get_platdata(hcd->self.controller);
 198         int                     need_transceiver = (config->otg != 0);
 199         int                     ret;
 200
 201         dev_dbg(hcd->self.controller, "starting USB Controller\n");
 202
 203         if (config->otg) {
 204                 hcd->self.otg_port = config->otg;
 205                 /* default/minimum OTG power budget:  8 mA */
 206                 hcd->power_budget = 8;
 207         }
 208
 209         /* boards can use OTG transceivers in non-OTG modes */
 210         need_transceiver = need_transceiver
 211                         || machine_is_omap_h2() || machine_is_omap_h3();
 212
 213         /* XXX OMAP16xx only */
 214         if (config->ocpi_enable)
 215                 config->ocpi_enable();
 216
 217 #ifdef  CONFIG_USB_OTG
 218         if (need_transceiver) {
 219                 hcd->usb_phy = usb_get_phy(USB_PHY_TYPE_USB2);
 220                 if (!IS_ERR_OR_NULL(hcd->usb_phy)) {
 221                         int     status = otg_set_host(hcd->usb_phy->otg,
 222                                                 &ohci_to_hcd(ohci)->self);
 223                         dev_dbg(hcd->self.controller, "init %s phy, status %d\n",
 224                                         hcd->usb_phy->label, status);
 225                         if (status) {
 226                                 usb_put_phy(hcd->usb_phy);
 227                                 return status;
 228                         }
 229                 } else {
 230                         return -EPROBE_DEFER;
 231                 }
 232                 ohci->start_hnp = start_hnp;
 233         }
 234 #endif
 235
 236         omap_ohci_clock_power(1);
 237
 238         if (cpu_is_omap15xx()) {
 239                 omap_1510_local_bus_power(1);
 240                 omap_1510_local_bus_init();
 241         }
 242
 243         ret = ohci_setup(hcd);
 244         if (ret < 0)
 245                 return ret;
 246
 247         if (config->otg || config->rwc) {
 248                 ohci->hc_control = OHCI_CTRL_RWC;
 249                 writel(OHCI_CTRL_RWC, &ohci->regs->control);
 250         }
 251
 252         /* board-specific power switching and overcurrent support */
 253         if (machine_is_omap_osk() || machine_is_omap_innovator()) {
 254                 u32     rh = roothub_a (ohci);
 255
 256                 /* power switching (ganged by default) */
 257                 rh &= ~RH_A_NPS;
 258
 259                 /* TPS2045 switch for internal transceiver (port 1) */
 260                 if (machine_is_omap_osk()) {
 261                         ohci_to_hcd(ohci)->power_budget = 250;
 262
 263                         rh &= ~RH_A_NOCP;
 264
 265                         /* gpio9 for overcurrent detction */
 266                         omap_cfg_reg(W8_1610_GPIO9);
 267                         gpio_request(9, "OHCI overcurrent");
 268                         gpio_direction_input(9);
 269
 270                         /* for paranoia's sake:  disable USB.PUEN */
 271                         omap_cfg_reg(W4_USB_HIGHZ);
 272                 }
 273                 ohci_writel(ohci, rh, &ohci->regs->roothub.a);
 274                 ohci->flags &= ~OHCI_QUIRK_HUB_POWER;
 275         } else if (machine_is_nokia770()) {
 276                 /* We require a self-powered hub, which should have
 277                  * plenty of power. */
 278                 ohci_to_hcd(ohci)->power_budget = 0;
 279         }
 280
 281         /* FIXME hub_wq hub requests should manage power switching */
 282         omap_ohci_transceiver_power(1);
 283
 284         /* board init will have already handled HMC and mux setup.
 285          * any external transceiver should already be initialized
 286          * too, so all configured ports use the right signaling now.
 287          */
 288
 289         return 0;
 290 }
 291
 292 /*-------------------------------------------------------------------------*/
 293
 294 /**
 295  * ohci_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 ohci_hcd_omap_probe(struct platform_device *pdev)
 303 {
 304         int retval, irq;
 305         struct usb_hcd *hcd = 0;
 306
 307         if (pdev->num_resources != 2) {
 308                 dev_err(&pdev->dev, "invalid num_resources: %i\n",
 309                        pdev->num_resources);
 310                 return -ENODEV;
 311         }
 312
 313         if (pdev->resource[0].flags != IORESOURCE_MEM
 314                         || pdev->resource[1].flags != IORESOURCE_IRQ) {
 315                 dev_err(&pdev->dev, "invalid resource type\n");
 316                 return -ENODEV;
 317         }
 318
 319         usb_host_ck = clk_get(&pdev->dev, "usb_hhc_ck");
 320         if (IS_ERR(usb_host_ck))
 321                 return PTR_ERR(usb_host_ck);
 322
 323         if (!cpu_is_omap15xx())
 324                 usb_dc_ck = clk_get(&pdev->dev, "usb_dc_ck");
 325         else
 326                 usb_dc_ck = clk_get(&pdev->dev, "lb_ck");
 327
 328         if (IS_ERR(usb_dc_ck)) {
 329                 clk_put(usb_host_ck);
 330                 return PTR_ERR(usb_dc_ck);
 331         }
 332
 333
 334         hcd = usb_create_hcd(&ohci_omap_hc_driver, &pdev->dev,
 335                         dev_name(&pdev->dev));
 336         if (!hcd) {
 337                 retval = -ENOMEM;
 338                 goto err0;
 339         }
 340         hcd->rsrc_start = pdev->resource[0].start;
 341         hcd->rsrc_len = pdev->resource[0].end - pdev->resource[0].start + 1;
 342
 343         if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
 344                 dev_dbg(&pdev->dev, "request_mem_region failed\n");
 345                 retval = -EBUSY;
 346                 goto err1;
 347         }
 348
 349         hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
 350         if (!hcd->regs) {
 351                 dev_err(&pdev->dev, "can't ioremap OHCI HCD\n");
 352                 retval = -ENOMEM;
 353                 goto err2;
 354         }
 355
 356         irq = platform_get_irq(pdev, 0);
 357         if (irq < 0) {
 358                 retval = -ENXIO;
 359                 goto err3;
 360         }
 361         retval = usb_add_hcd(hcd, irq, 0);
 362         if (retval)
 363                 goto err3;
 364
 365         device_wakeup_enable(hcd->self.controller);
 366         return 0;
 367 err3:
 368         iounmap(hcd->regs);
 369 err2:
 370         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 371 err1:
 372         usb_put_hcd(hcd);
 373 err0:
 374         clk_put(usb_dc_ck);
 375         clk_put(usb_host_ck);
 376         return retval;
 377 }
 378
 379
 380 /* may be called with controller, bus, and devices active */
 381
 382 /**
 383  * ohci_hcd_omap_remove - shutdown processing for OMAP-based HCDs
 384  * @dev: USB Host Controller being removed
 385  * Context: !in_interrupt()
 386  *
 387  * Reverses the effect of ohci_hcd_omap_probe(), first invoking
 388  * the HCD's stop() method.  It is always called from a thread
 389  * context, normally "rmmod", "apmd", or something similar.
 390  */
 391 static int ohci_hcd_omap_remove(struct platform_device *pdev)
 392 {
 393         struct usb_hcd  *hcd = platform_get_drvdata(pdev);
 394
 395         dev_dbg(hcd->self.controller, "stopping USB Controller\n");
 396         usb_remove_hcd(hcd);
 397         omap_ohci_clock_power(0);
 398         if (!IS_ERR_OR_NULL(hcd->usb_phy)) {
 399                 (void) otg_set_host(hcd->usb_phy->otg, 0);
 400                 usb_put_phy(hcd->usb_phy);
 401         }
 402         if (machine_is_omap_osk())
 403                 gpio_free(9);
 404         iounmap(hcd->regs);
 405         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
 406         usb_put_hcd(hcd);
 407         clk_put(usb_dc_ck);
 408         clk_put(usb_host_ck);
 409         return 0;
 410 }
 411
 412 /*-------------------------------------------------------------------------*/
 413
 414 #ifdef  CONFIG_PM
 415
 416 static int ohci_omap_suspend(struct platform_device *pdev, pm_message_t message)
 417 {
 418         struct usb_hcd *hcd = platform_get_drvdata(pdev);
 419         struct ohci_hcd *ohci = hcd_to_ohci(hcd);
 420         bool do_wakeup = device_may_wakeup(&pdev->dev);
 421         int ret;
 422
 423         if (time_before(jiffies, ohci->next_statechange))
 424                 msleep(5);
 425         ohci->next_statechange = jiffies;
 426
 427         ret = ohci_suspend(hcd, do_wakeup);
 428         if (ret)
 429                 return ret;
 430
 431         omap_ohci_clock_power(0);
 432         return ret;
 433 }
 434
 435 static int ohci_omap_resume(struct platform_device *dev)
 436 {
 437         struct usb_hcd  *hcd = platform_get_drvdata(dev);
 438         struct ohci_hcd *ohci = hcd_to_ohci(hcd);
 439
 440         if (time_before(jiffies, ohci->next_statechange))
 441                 msleep(5);
 442         ohci->next_statechange = jiffies;
 443
 444         omap_ohci_clock_power(1);
 445         ohci_resume(hcd, false);
 446         return 0;
 447 }
 448
 449 #endif
 450
 451 /*-------------------------------------------------------------------------*/
 452
 453 /*
 454  * Driver definition to register with the OMAP bus
 455  */
 456 static struct platform_driver ohci_hcd_omap_driver = {
 457         .probe          = ohci_hcd_omap_probe,
 458         .remove         = ohci_hcd_omap_remove,
 459         .shutdown       = usb_hcd_platform_shutdown,
 460 #ifdef  CONFIG_PM
 461         .suspend        = ohci_omap_suspend,
 462         .resume         = ohci_omap_resume,
 463 #endif
 464         .driver         = {
 465                 .name   = "ohci",
 466         },
 467 };
 468
 469 static const struct ohci_driver_overrides omap_overrides __initconst = {
 470         .product_desc   = "OMAP OHCI",
 471         .reset          = ohci_omap_reset
 472 };
 473
 474 static int __init ohci_omap_init(void)
 475 {
 476         if (usb_disabled())
 477                 return -ENODEV;
 478
 479         pr_info("%s: " DRIVER_DESC "\n", hcd_name);
 480
 481         ohci_init_driver(&ohci_omap_hc_driver, &omap_overrides);
 482         return platform_driver_register(&ohci_hcd_omap_driver);
 483 }
 484 module_init(ohci_omap_init);
 485
 486 static void __exit ohci_omap_cleanup(void)
 487 {
 488         platform_driver_unregister(&ohci_hcd_omap_driver);
 489 }
 490 module_exit(ohci_omap_cleanup);
 491
 492 MODULE_DESCRIPTION(DRIVER_DESC);
 493 MODULE_ALIAS("platform:ohci");
 494 MODULE_LICENSE("GPL");