arch/arm/plat-omap/usb.c

   1 /*
   2  * arch/arm/plat-omap/usb.c -- platform level USB initialization
   3  *
   4  * Copyright (C) 2004 Texas Instruments, Inc.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20
  21 #undef  DEBUG
  22
  23 #include <linux/config.h>
  24 #include <linux/module.h>
  25 #include <linux/kernel.h>
  26 #include <linux/types.h>
  27 #include <linux/errno.h>
  28 #include <linux/init.h>
  29 #include <linux/platform_device.h>
  30 #include <linux/usb_otg.h>
  31
  32 #include <asm/io.h>
  33 #include <asm/irq.h>
  34 #include <asm/system.h>
  35 #include <asm/hardware.h>
  36
  37 #include <asm/arch/mux.h>
  38 #include <asm/arch/usb.h>
  39 #include <asm/arch/board.h>
  40
  41 /* These routines should handle the standard chip-specific modes
  42  * for usb0/1/2 ports, covering basic mux and transceiver setup.
  43  * Call omap_usb_init() once, from INIT_MACHINE().
  44  *
  45  * Some board-*.c files will need to set up additional mux options,
  46  * like for suspend handling, vbus sensing, GPIOs, and the D+ pullup.
  47  */
  48
  49 /* TESTED ON:
  50  *  - 1611B H2 (with usb1 mini-AB) using standard Mini-B or OTG cables
  51  *  - 5912 OSK OHCI (with usb0 standard-A), standard A-to-B cables
  52  *  - 5912 OSK UDC, with *nonstandard* A-to-A cable
  53  *  - 1510 Innovator UDC with bundled usb0 cable
  54  *  - 1510 Innovator OHCI with bundled usb1/usb2 cable
  55  *  - 1510 Innovator OHCI with custom usb0 cable, feeding 5V VBUS
  56  *  - 1710 custom development board using alternate pin group
  57  *  - 1710 H3 (with usb1 mini-AB) using standard Mini-B or OTG cables
  58  */
  59
  60 /*-------------------------------------------------------------------------*/
  61
  62 #ifdef  CONFIG_ARCH_OMAP_OTG
  63
  64 static struct otg_transceiver *xceiv;
  65
  66 /**
  67  * otg_get_transceiver - find the (single) OTG transceiver driver
  68  *
  69  * Returns the transceiver driver, after getting a refcount to it; or
  70  * null if there is no such transceiver.  The caller is responsible for
  71  * releasing that count.
  72  */
  73 struct otg_transceiver *otg_get_transceiver(void)
  74 {
  75         if (xceiv)
  76                 get_device(xceiv->dev);
  77         return xceiv;
  78 }
  79 EXPORT_SYMBOL(otg_get_transceiver);
  80
  81 int otg_set_transceiver(struct otg_transceiver *x)
  82 {
  83         if (xceiv && x)
  84                 return -EBUSY;
  85         xceiv = x;
  86         return 0;
  87 }
  88 EXPORT_SYMBOL(otg_set_transceiver);
  89
  90 #endif
  91
  92 /*-------------------------------------------------------------------------*/
  93
  94 #if defined(CONFIG_ARCH_OMAP_OTG) || defined(CONFIG_ARCH_OMAP15XX)
  95
  96 static u32 __init omap_usb0_init(unsigned nwires, unsigned is_device)
  97 {
  98         u32     syscon1 = 0;
  99
 100         if (nwires == 0) {
 101                 if (!cpu_is_omap15xx()) {
 102                         /* pulldown D+/D- */
 103                         USB_TRANSCEIVER_CTRL_REG &= ~(3 << 1);
 104                 }
 105                 return 0;
 106         }
 107
 108         if (is_device)
 109                 omap_cfg_reg(W4_USB_PUEN);
 110
 111         /* internal transceiver */
 112         if (nwires == 2) {
 113                 // omap_cfg_reg(P9_USB_DP);
 114                 // omap_cfg_reg(R8_USB_DM);
 115
 116                 if (cpu_is_omap15xx()) {
 117                         /* This works on 1510-Innovator */
 118                         return 0;
 119                 }
 120
 121                 /* NOTES:
 122                  *  - peripheral should configure VBUS detection!
 123                  *  - only peripherals may use the internal D+/D- pulldowns
 124                  *  - OTG support on this port not yet written
 125                  */
 126
 127                 USB_TRANSCEIVER_CTRL_REG &= ~(7 << 4);
 128                 if (!is_device)
 129                         USB_TRANSCEIVER_CTRL_REG |= (3 << 1);
 130
 131                 return 3 << 16;
 132         }
 133
 134         /* alternate pin config, external transceiver */
 135         if (cpu_is_omap15xx()) {
 136                 printk(KERN_ERR "no usb0 alt pin config on 15xx\n");
 137                 return 0;
 138         }
 139
 140         omap_cfg_reg(V6_USB0_TXD);
 141         omap_cfg_reg(W9_USB0_TXEN);
 142         omap_cfg_reg(W5_USB0_SE0);
 143
 144         /* NOTE:  SPEED and SUSP aren't configured here */
 145
 146         if (nwires != 3)
 147                 omap_cfg_reg(Y5_USB0_RCV);
 148         if (nwires != 6)
 149                 USB_TRANSCEIVER_CTRL_REG &= ~CONF_USB2_UNI_R;
 150
 151         switch (nwires) {
 152         case 3:
 153                 syscon1 = 2;
 154                 break;
 155         case 4:
 156                 syscon1 = 1;
 157                 break;
 158         case 6:
 159                 syscon1 = 3;
 160                 omap_cfg_reg(AA9_USB0_VP);
 161                 omap_cfg_reg(R9_USB0_VM);
 162                 USB_TRANSCEIVER_CTRL_REG |= CONF_USB2_UNI_R;
 163                 break;
 164         default:
 165                 printk(KERN_ERR "illegal usb%d %d-wire transceiver\n",
 166                         0, nwires);
 167         }
 168         return syscon1 << 16;
 169 }
 170
 171 static u32 __init omap_usb1_init(unsigned nwires)
 172 {
 173         u32     syscon1 = 0;
 174
 175         if (nwires != 6 && !cpu_is_omap15xx())
 176                 USB_TRANSCEIVER_CTRL_REG &= ~CONF_USB1_UNI_R;
 177         if (nwires == 0)
 178                 return 0;
 179
 180         /* external transceiver */
 181         omap_cfg_reg(USB1_TXD);
 182         omap_cfg_reg(USB1_TXEN);
 183         if (cpu_is_omap15xx()) {
 184                 omap_cfg_reg(USB1_SEO);
 185                 omap_cfg_reg(USB1_SPEED);
 186                 // SUSP
 187         } else if (cpu_is_omap1610() || cpu_is_omap5912()) {
 188                 omap_cfg_reg(W13_1610_USB1_SE0);
 189                 omap_cfg_reg(R13_1610_USB1_SPEED);
 190                 // SUSP
 191         } else if (cpu_is_omap1710()) {
 192                 omap_cfg_reg(R13_1710_USB1_SE0);
 193                 // SUSP
 194         } else {
 195                 pr_debug("usb unrecognized\n");
 196         }
 197         if (nwires != 3)
 198                 omap_cfg_reg(USB1_RCV);
 199
 200         switch (nwires) {
 201         case 3:
 202                 syscon1 = 2;
 203                 break;
 204         case 4:
 205                 syscon1 = 1;
 206                 break;
 207         case 6:
 208                 syscon1 = 3;
 209                 omap_cfg_reg(USB1_VP);
 210                 omap_cfg_reg(USB1_VM);
 211                 if (!cpu_is_omap15xx())
 212                         USB_TRANSCEIVER_CTRL_REG |= CONF_USB1_UNI_R;
 213                 break;
 214         default:
 215                 printk(KERN_ERR "illegal usb%d %d-wire transceiver\n",
 216                         1, nwires);
 217         }
 218         return syscon1 << 20;
 219 }
 220
 221 static u32 __init omap_usb2_init(unsigned nwires, unsigned alt_pingroup)
 222 {
 223         u32     syscon1 = 0;
 224
 225         /* NOTE erratum: must leave USB2_UNI_R set if usb0 in use */
 226         if (alt_pingroup || nwires == 0)
 227                 return 0;
 228         if (nwires != 6 && !cpu_is_omap15xx())
 229                 USB_TRANSCEIVER_CTRL_REG &= ~CONF_USB2_UNI_R;
 230
 231         /* external transceiver */
 232         if (cpu_is_omap15xx()) {
 233                 omap_cfg_reg(USB2_TXD);
 234                 omap_cfg_reg(USB2_TXEN);
 235                 omap_cfg_reg(USB2_SEO);
 236                 if (nwires != 3)
 237                         omap_cfg_reg(USB2_RCV);
 238                 /* there is no USB2_SPEED */
 239         } else if (cpu_is_omap16xx()) {
 240                 omap_cfg_reg(V6_USB2_TXD);
 241                 omap_cfg_reg(W9_USB2_TXEN);
 242                 omap_cfg_reg(W5_USB2_SE0);
 243                 if (nwires != 3)
 244                         omap_cfg_reg(Y5_USB2_RCV);
 245                 // FIXME omap_cfg_reg(USB2_SPEED);
 246         } else {
 247                 pr_debug("usb unrecognized\n");
 248         }
 249         // omap_cfg_reg(USB2_SUSP);
 250
 251         switch (nwires) {
 252         case 3:
 253                 syscon1 = 2;
 254                 break;
 255         case 4:
 256                 syscon1 = 1;
 257                 break;
 258         case 6:
 259                 syscon1 = 3;
 260                 if (cpu_is_omap15xx()) {
 261                         omap_cfg_reg(USB2_VP);
 262                         omap_cfg_reg(USB2_VM);
 263                 } else {
 264                         omap_cfg_reg(AA9_USB2_VP);
 265                         omap_cfg_reg(R9_USB2_VM);
 266                         USB_TRANSCEIVER_CTRL_REG |= CONF_USB2_UNI_R;
 267                 }
 268                 break;
 269         default:
 270                 printk(KERN_ERR "illegal usb%d %d-wire transceiver\n",
 271                         2, nwires);
 272         }
 273         return syscon1 << 24;
 274 }
 275
 276 #endif
 277
 278 /*-------------------------------------------------------------------------*/
 279
 280 #if     defined(CONFIG_USB_GADGET_OMAP) || \
 281         defined(CONFIG_USB_OHCI_HCD) || defined(CONFIG_USB_OHCI_HCD_MODULE) || \
 282         (defined(CONFIG_USB_OTG) && defined(CONFIG_ARCH_OMAP_OTG))
 283 static void usb_release(struct device *dev)
 284 {
 285         /* normally not freed */
 286 }
 287 #endif
 288
 289 #ifdef  CONFIG_USB_GADGET_OMAP
 290
 291 static struct resource udc_resources[] = {
 292         /* order is significant! */
 293         {               /* registers */
 294                 .start          = UDC_BASE,
 295                 .end            = UDC_BASE + 0xff,
 296                 .flags          = IORESOURCE_MEM,
 297         }, {            /* general IRQ */
 298                 .start          = IH2_BASE + 20,
 299                 .flags          = IORESOURCE_IRQ,
 300         }, {            /* PIO IRQ */
 301                 .start          = IH2_BASE + 30,
 302                 .flags          = IORESOURCE_IRQ,
 303         }, {            /* SOF IRQ */
 304                 .start          = IH2_BASE + 29,
 305                 .flags          = IORESOURCE_IRQ,
 306         },
 307 };
 308
 309 static u64 udc_dmamask = ~(u32)0;
 310
 311 static struct platform_device udc_device = {
 312         .name           = "omap_udc",
 313         .id             = -1,
 314         .dev = {
 315                 .release                = usb_release,
 316                 .dma_mask               = &udc_dmamask,
 317                 .coherent_dma_mask      = 0xffffffff,
 318         },
 319         .num_resources  = ARRAY_SIZE(udc_resources),
 320         .resource       = udc_resources,
 321 };
 322
 323 #endif
 324
 325 #if     defined(CONFIG_USB_OHCI_HCD) || defined(CONFIG_USB_OHCI_HCD_MODULE)
 326
 327 /* The dmamask must be set for OHCI to work */
 328 static u64 ohci_dmamask = ~(u32)0;
 329
 330 static struct resource ohci_resources[] = {
 331         {
 332                 .start  = OMAP_OHCI_BASE,
 333                 .end    = OMAP_OHCI_BASE + 4096 - 1,
 334                 .flags  = IORESOURCE_MEM,
 335         },
 336         {
 337                 .start  = INT_USB_HHC_1,
 338                 .flags  = IORESOURCE_IRQ,
 339         },
 340 };
 341
 342 static struct platform_device ohci_device = {
 343         .name                   = "ohci",
 344         .id                     = -1,
 345         .dev = {
 346                 .release                = usb_release,
 347                 .dma_mask               = &ohci_dmamask,
 348                 .coherent_dma_mask      = 0xffffffff,
 349         },
 350         .num_resources  = ARRAY_SIZE(ohci_resources),
 351         .resource               = ohci_resources,
 352 };
 353
 354 #endif
 355
 356 #if     defined(CONFIG_USB_OTG) && defined(CONFIG_ARCH_OMAP_OTG)
 357
 358 static struct resource otg_resources[] = {
 359         /* order is significant! */
 360         {
 361                 .start          = OTG_BASE,
 362                 .end            = OTG_BASE + 0xff,
 363                 .flags          = IORESOURCE_MEM,
 364         }, {
 365                 .start          = IH2_BASE + 8,
 366                 .flags          = IORESOURCE_IRQ,
 367         },
 368 };
 369
 370 static struct platform_device otg_device = {
 371         .name           = "omap_otg",
 372         .id             = -1,
 373         .dev = {
 374                 .release                = usb_release,
 375         },
 376         .num_resources  = ARRAY_SIZE(otg_resources),
 377         .resource       = otg_resources,
 378 };
 379
 380 #endif
 381
 382 /*-------------------------------------------------------------------------*/
 383
 384 #define ULPD_CLOCK_CTRL_REG     __REG16(ULPD_CLOCK_CTRL)
 385 #define ULPD_SOFT_REQ_REG       __REG16(ULPD_SOFT_REQ)
 386
 387
 388 // FIXME correct answer depends on hmc_mode,
 389 // as does any nonzero value for config->otg port number
 390 #ifdef  CONFIG_USB_GADGET_OMAP
 391 #define is_usb0_device(config)  1
 392 #else
 393 #define is_usb0_device(config)  0
 394 #endif
 395
 396 /*-------------------------------------------------------------------------*/
 397
 398 #ifdef  CONFIG_ARCH_OMAP_OTG
 399
 400 void __init
 401 omap_otg_init(struct omap_usb_config *config)
 402 {
 403         u32             syscon = OTG_SYSCON_1_REG & 0xffff;
 404         int             status;
 405         int             alt_pingroup = 0;
 406
 407         /* NOTE:  no bus or clock setup (yet?) */
 408
 409         syscon = OTG_SYSCON_1_REG & 0xffff;
 410         if (!(syscon & OTG_RESET_DONE))
 411                 pr_debug("USB resets not complete?\n");
 412
 413         // OTG_IRQ_EN_REG = 0;
 414
 415         /* pin muxing and transceiver pinouts */
 416         if (config->pins[0] > 2)        /* alt pingroup 2 */
 417                 alt_pingroup = 1;
 418         syscon |= omap_usb0_init(config->pins[0], is_usb0_device(config));
 419         syscon |= omap_usb1_init(config->pins[1]);
 420         syscon |= omap_usb2_init(config->pins[2], alt_pingroup);
 421         pr_debug("OTG_SYSCON_1_REG = %08x\n", syscon);
 422         OTG_SYSCON_1_REG = syscon;
 423
 424         syscon = config->hmc_mode;
 425         syscon |= USBX_SYNCHRO | (4 << 16) /* B_ASE0_BRST */;
 426 #ifdef  CONFIG_USB_OTG
 427         if (config->otg)
 428                 syscon |= OTG_EN;
 429 #endif
 430         pr_debug("USB_TRANSCEIVER_CTRL_REG = %03x\n", USB_TRANSCEIVER_CTRL_REG);
 431         pr_debug("OTG_SYSCON_2_REG = %08x\n", syscon);
 432         OTG_SYSCON_2_REG = syscon;
 433
 434         printk("USB: hmc %d", config->hmc_mode);
 435         if (alt_pingroup)
 436                 printk(", usb2 alt %d wires", config->pins[2]);
 437         else if (config->pins[0])
 438                 printk(", usb0 %d wires%s", config->pins[0],
 439                         is_usb0_device(config) ? " (dev)" : "");
 440         if (config->pins[1])
 441                 printk(", usb1 %d wires", config->pins[1]);
 442         if (!alt_pingroup && config->pins[2])
 443                 printk(", usb2 %d wires", config->pins[2]);
 444         if (config->otg)
 445                 printk(", Mini-AB on usb%d", config->otg - 1);
 446         printk("\n");
 447
 448         /* leave USB clocks/controllers off until needed */
 449         ULPD_SOFT_REQ_REG &= ~SOFT_USB_CLK_REQ;
 450         ULPD_CLOCK_CTRL_REG &= ~USB_MCLK_EN;
 451         ULPD_CLOCK_CTRL_REG |= DIS_USB_PVCI_CLK;
 452         syscon = OTG_SYSCON_1_REG;
 453         syscon |= HST_IDLE_EN|DEV_IDLE_EN|OTG_IDLE_EN;
 454
 455 #ifdef  CONFIG_USB_GADGET_OMAP
 456         if (config->otg || config->register_dev) {
 457                 syscon &= ~DEV_IDLE_EN;
 458                 udc_device.dev.platform_data = config;
 459                 /* FIXME patch IRQ numbers for omap730 */
 460                 status = platform_device_register(&udc_device);
 461                 if (status)
 462                         pr_debug("can't register UDC device, %d\n", status);
 463         }
 464 #endif
 465
 466 #if     defined(CONFIG_USB_OHCI_HCD) || defined(CONFIG_USB_OHCI_HCD_MODULE)
 467         if (config->otg || config->register_host) {
 468                 syscon &= ~HST_IDLE_EN;
 469                 ohci_device.dev.platform_data = config;
 470                 if (cpu_is_omap730())
 471                         ohci_resources[1].start = INT_730_USB_HHC_1;
 472                 status = platform_device_register(&ohci_device);
 473                 if (status)
 474                         pr_debug("can't register OHCI device, %d\n", status);
 475         }
 476 #endif
 477
 478 #ifdef  CONFIG_USB_OTG
 479         if (config->otg) {
 480                 syscon &= ~OTG_IDLE_EN;
 481                 otg_device.dev.platform_data = config;
 482                 if (cpu_is_omap730())
 483                         otg_resources[1].start = INT_730_USB_OTG;
 484                 status = platform_device_register(&otg_device);
 485                 if (status)
 486                         pr_debug("can't register OTG device, %d\n", status);
 487         }
 488 #endif
 489         pr_debug("OTG_SYSCON_1_REG = %08x\n", syscon);
 490         OTG_SYSCON_1_REG = syscon;
 491
 492         status = 0;
 493 }
 494
 495 #else
 496 static inline void omap_otg_init(struct omap_usb_config *config) {}
 497 #endif
 498
 499 /*-------------------------------------------------------------------------*/
 500
 501 #ifdef  CONFIG_ARCH_OMAP15XX
 502
 503 #define ULPD_DPLL_CTRL_REG      __REG16(ULPD_DPLL_CTRL)
 504 #define DPLL_IOB                (1 << 13)
 505 #define DPLL_PLL_ENABLE         (1 << 4)
 506 #define DPLL_LOCK               (1 << 0)
 507
 508 #define ULPD_APLL_CTRL_REG      __REG16(ULPD_APLL_CTRL)
 509 #define APLL_NDPLL_SWITCH       (1 << 0)
 510
 511
 512 static void __init omap_1510_usb_init(struct omap_usb_config *config)
 513 {
 514         unsigned int val;
 515
 516         omap_usb0_init(config->pins[0], is_usb0_device(config));
 517         omap_usb1_init(config->pins[1]);
 518         omap_usb2_init(config->pins[2], 0);
 519
 520         val = omap_readl(MOD_CONF_CTRL_0) & ~(0x3f << 1);
 521         val |= (config->hmc_mode << 1);
 522         omap_writel(val, MOD_CONF_CTRL_0);
 523
 524         printk("USB: hmc %d", config->hmc_mode);
 525         if (config->pins[0])
 526                 printk(", usb0 %d wires%s", config->pins[0],
 527                         is_usb0_device(config) ? " (dev)" : "");
 528         if (config->pins[1])
 529                 printk(", usb1 %d wires", config->pins[1]);
 530         if (config->pins[2])
 531                 printk(", usb2 %d wires", config->pins[2]);
 532         printk("\n");
 533
 534         /* use DPLL for 48 MHz function clock */
 535         pr_debug("APLL %04x DPLL %04x REQ %04x\n", ULPD_APLL_CTRL_REG,
 536                         ULPD_DPLL_CTRL_REG, ULPD_SOFT_REQ_REG);
 537         ULPD_APLL_CTRL_REG &= ~APLL_NDPLL_SWITCH;
 538         ULPD_DPLL_CTRL_REG |= DPLL_IOB | DPLL_PLL_ENABLE;
 539         ULPD_SOFT_REQ_REG |= SOFT_UDC_REQ | SOFT_DPLL_REQ;
 540         while (!(ULPD_DPLL_CTRL_REG & DPLL_LOCK))
 541                 cpu_relax();
 542
 543 #ifdef  CONFIG_USB_GADGET_OMAP
 544         if (config->register_dev) {
 545                 int status;
 546
 547                 udc_device.dev.platform_data = config;
 548                 status = platform_device_register(&udc_device);
 549                 if (status)
 550                         pr_debug("can't register UDC device, %d\n", status);
 551                 /* udc driver gates 48MHz by D+ pullup */
 552         }
 553 #endif
 554
 555 #if     defined(CONFIG_USB_OHCI_HCD) || defined(CONFIG_USB_OHCI_HCD_MODULE)
 556         if (config->register_host) {
 557                 int status;
 558
 559                 ohci_device.dev.platform_data = config;
 560                 status = platform_device_register(&ohci_device);
 561                 if (status)
 562                         pr_debug("can't register OHCI device, %d\n", status);
 563                 /* hcd explicitly gates 48MHz */
 564         }
 565 #endif
 566 }
 567
 568 #else
 569 static inline void omap_1510_usb_init(struct omap_usb_config *config) {}
 570 #endif
 571
 572 /*-------------------------------------------------------------------------*/
 573
 574 static struct omap_usb_config platform_data;
 575
 576 static int __init
 577 omap_usb_init(void)
 578 {
 579         const struct omap_usb_config *config;
 580
 581         config = omap_get_config(OMAP_TAG_USB, struct omap_usb_config);
 582         if (config == NULL) {
 583                 printk(KERN_ERR "USB: No board-specific "
 584                                 "platform config found\n");
 585                 return -ENODEV;
 586         }
 587         platform_data = *config;
 588
 589         if (cpu_is_omap730() || cpu_is_omap16xx())
 590                 omap_otg_init(&platform_data);
 591         else if (cpu_is_omap15xx())
 592                 omap_1510_usb_init(&platform_data);
 593         else {
 594                 printk(KERN_ERR "USB: No init for your chip yet\n");
 595                 return -ENODEV;
 596         }
 597         return 0;
 598 }
 599
 600 subsys_initcall(omap_usb_init);