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