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