drivers/mfd/omap-usb-tll.c

   1 /**
   2  * omap-usb-tll.c - The USB TLL driver for OMAP EHCI & OHCI
   3  *
   4  * Copyright (C) 2012-2013 Texas Instruments Incorporated - http://www.ti.com
   5  * Author: Keshava Munegowda <keshava_mgowda@ti.com>
   6  * Author: Roger Quadros <rogerq@ti.com>
   7  *
   8  * This program is free software: you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2  of
  10  * the License as published by the Free Software Foundation.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19  */
  20 #include <linux/kernel.h>
  21 #include <linux/module.h>
  22 #include <linux/types.h>
  23 #include <linux/slab.h>
  24 #include <linux/spinlock.h>
  25 #include <linux/platform_device.h>
  26 #include <linux/clk.h>
  27 #include <linux/io.h>
  28 #include <linux/err.h>
  29 #include <linux/pm_runtime.h>
  30 #include <linux/platform_data/usb-omap.h>
  31 #include <linux/of.h>
  32
  33 #include "omap-usb.h"
  34
  35 #define USBTLL_DRIVER_NAME      "usbhs_tll"
  36
  37 /* TLL Register Set */
  38 #define OMAP_USBTLL_REVISION                            (0x00)
  39 #define OMAP_USBTLL_SYSCONFIG                           (0x10)
  40 #define OMAP_USBTLL_SYSCONFIG_CACTIVITY                 (1 << 8)
  41 #define OMAP_USBTLL_SYSCONFIG_SIDLEMODE                 (1 << 3)
  42 #define OMAP_USBTLL_SYSCONFIG_ENAWAKEUP                 (1 << 2)
  43 #define OMAP_USBTLL_SYSCONFIG_SOFTRESET                 (1 << 1)
  44 #define OMAP_USBTLL_SYSCONFIG_AUTOIDLE                  (1 << 0)
  45
  46 #define OMAP_USBTLL_SYSSTATUS                           (0x14)
  47 #define OMAP_USBTLL_SYSSTATUS_RESETDONE                 (1 << 0)
  48
  49 #define OMAP_USBTLL_IRQSTATUS                           (0x18)
  50 #define OMAP_USBTLL_IRQENABLE                           (0x1C)
  51
  52 #define OMAP_TLL_SHARED_CONF                            (0x30)
  53 #define OMAP_TLL_SHARED_CONF_USB_90D_DDR_EN             (1 << 6)
  54 #define OMAP_TLL_SHARED_CONF_USB_180D_SDR_EN            (1 << 5)
  55 #define OMAP_TLL_SHARED_CONF_USB_DIVRATION              (1 << 2)
  56 #define OMAP_TLL_SHARED_CONF_FCLK_REQ                   (1 << 1)
  57 #define OMAP_TLL_SHARED_CONF_FCLK_IS_ON                 (1 << 0)
  58
  59 #define OMAP_TLL_CHANNEL_CONF(num)                      (0x040 + 0x004 * num)
  60 #define OMAP_TLL_CHANNEL_CONF_FSLSMODE_SHIFT            24
  61 #define OMAP_TLL_CHANNEL_CONF_DRVVBUS                   (1 << 16)
  62 #define OMAP_TLL_CHANNEL_CONF_CHRGVBUS                  (1 << 15)
  63 #define OMAP_TLL_CHANNEL_CONF_ULPINOBITSTUFF            (1 << 11)
  64 #define OMAP_TLL_CHANNEL_CONF_ULPI_ULPIAUTOIDLE         (1 << 10)
  65 #define OMAP_TLL_CHANNEL_CONF_UTMIAUTOIDLE              (1 << 9)
  66 #define OMAP_TLL_CHANNEL_CONF_ULPIDDRMODE               (1 << 8)
  67 #define OMAP_TLL_CHANNEL_CONF_MODE_TRANSPARENT_UTMI     (2 << 1)
  68 #define OMAP_TLL_CHANNEL_CONF_CHANMODE_FSLS             (1 << 1)
  69 #define OMAP_TLL_CHANNEL_CONF_CHANEN                    (1 << 0)
  70
  71 #define OMAP_TLL_FSLSMODE_6PIN_PHY_DAT_SE0              0x0
  72 #define OMAP_TLL_FSLSMODE_6PIN_PHY_DP_DM                0x1
  73 #define OMAP_TLL_FSLSMODE_3PIN_PHY                      0x2
  74 #define OMAP_TLL_FSLSMODE_4PIN_PHY                      0x3
  75 #define OMAP_TLL_FSLSMODE_6PIN_TLL_DAT_SE0              0x4
  76 #define OMAP_TLL_FSLSMODE_6PIN_TLL_DP_DM                0x5
  77 #define OMAP_TLL_FSLSMODE_3PIN_TLL                      0x6
  78 #define OMAP_TLL_FSLSMODE_4PIN_TLL                      0x7
  79 #define OMAP_TLL_FSLSMODE_2PIN_TLL_DAT_SE0              0xA
  80 #define OMAP_TLL_FSLSMODE_2PIN_DAT_DP_DM                0xB
  81
  82 #define OMAP_TLL_ULPI_FUNCTION_CTRL(num)                (0x804 + 0x100 * num)
  83 #define OMAP_TLL_ULPI_INTERFACE_CTRL(num)               (0x807 + 0x100 * num)
  84 #define OMAP_TLL_ULPI_OTG_CTRL(num)                     (0x80A + 0x100 * num)
  85 #define OMAP_TLL_ULPI_INT_EN_RISE(num)                  (0x80D + 0x100 * num)
  86 #define OMAP_TLL_ULPI_INT_EN_FALL(num)                  (0x810 + 0x100 * num)
  87 #define OMAP_TLL_ULPI_INT_STATUS(num)                   (0x813 + 0x100 * num)
  88 #define OMAP_TLL_ULPI_INT_LATCH(num)                    (0x814 + 0x100 * num)
  89 #define OMAP_TLL_ULPI_DEBUG(num)                        (0x815 + 0x100 * num)
  90 #define OMAP_TLL_ULPI_SCRATCH_REGISTER(num)             (0x816 + 0x100 * num)
  91
  92 #define OMAP_REV2_TLL_CHANNEL_COUNT                     2
  93 #define OMAP_TLL_CHANNEL_COUNT                          3
  94 #define OMAP_TLL_CHANNEL_1_EN_MASK                      (1 << 0)
  95 #define OMAP_TLL_CHANNEL_2_EN_MASK                      (1 << 1)
  96 #define OMAP_TLL_CHANNEL_3_EN_MASK                      (1 << 2)
  97
  98 /* Values of USBTLL_REVISION - Note: these are not given in the TRM */
  99 #define OMAP_USBTLL_REV1                0x00000015      /* OMAP3 */
 100 #define OMAP_USBTLL_REV2                0x00000018      /* OMAP 3630 */
 101 #define OMAP_USBTLL_REV3                0x00000004      /* OMAP4 */
 102 #define OMAP_USBTLL_REV4                0x00000006      /* OMAP5 */
 103
 104 #define is_ehci_tll_mode(x)     (x == OMAP_EHCI_PORT_MODE_TLL)
 105
 106 /* only PHY and UNUSED modes don't need TLL */
 107 #define omap_usb_mode_needs_tll(x)      ((x) != OMAP_USBHS_PORT_MODE_UNUSED &&\
 108                                          (x) != OMAP_EHCI_PORT_MODE_PHY)
 109
 110 struct usbtll_omap {
 111         int                                     nch;    /* num. of channels */
 112         struct clk                              **ch_clk;
 113         void __iomem                            *base;
 114 };
 115
 116 /*-------------------------------------------------------------------------*/
 117
 118 static const char usbtll_driver_name[] = USBTLL_DRIVER_NAME;
 119 static struct device    *tll_dev;
 120 static DEFINE_SPINLOCK(tll_lock);       /* serialize access to tll_dev */
 121
 122 /*-------------------------------------------------------------------------*/
 123
 124 static inline void usbtll_write(void __iomem *base, u32 reg, u32 val)
 125 {
 126         writel_relaxed(val, base + reg);
 127 }
 128
 129 static inline u32 usbtll_read(void __iomem *base, u32 reg)
 130 {
 131         return readl_relaxed(base + reg);
 132 }
 133
 134 static inline void usbtll_writeb(void __iomem *base, u8 reg, u8 val)
 135 {
 136         writeb_relaxed(val, base + reg);
 137 }
 138
 139 static inline u8 usbtll_readb(void __iomem *base, u8 reg)
 140 {
 141         return readb_relaxed(base + reg);
 142 }
 143
 144 /*-------------------------------------------------------------------------*/
 145
 146 static bool is_ohci_port(enum usbhs_omap_port_mode pmode)
 147 {
 148         switch (pmode) {
 149         case OMAP_OHCI_PORT_MODE_PHY_6PIN_DATSE0:
 150         case OMAP_OHCI_PORT_MODE_PHY_6PIN_DPDM:
 151         case OMAP_OHCI_PORT_MODE_PHY_3PIN_DATSE0:
 152         case OMAP_OHCI_PORT_MODE_PHY_4PIN_DPDM:
 153         case OMAP_OHCI_PORT_MODE_TLL_6PIN_DATSE0:
 154         case OMAP_OHCI_PORT_MODE_TLL_6PIN_DPDM:
 155         case OMAP_OHCI_PORT_MODE_TLL_3PIN_DATSE0:
 156         case OMAP_OHCI_PORT_MODE_TLL_4PIN_DPDM:
 157         case OMAP_OHCI_PORT_MODE_TLL_2PIN_DATSE0:
 158         case OMAP_OHCI_PORT_MODE_TLL_2PIN_DPDM:
 159                 return true;
 160
 161         default:
 162                 return false;
 163         }
 164 }
 165
 166 /*
 167  * convert the port-mode enum to a value we can use in the FSLSMODE
 168  * field of USBTLL_CHANNEL_CONF
 169  */
 170 static unsigned ohci_omap3_fslsmode(enum usbhs_omap_port_mode mode)
 171 {
 172         switch (mode) {
 173         case OMAP_USBHS_PORT_MODE_UNUSED:
 174         case OMAP_OHCI_PORT_MODE_PHY_6PIN_DATSE0:
 175                 return OMAP_TLL_FSLSMODE_6PIN_PHY_DAT_SE0;
 176
 177         case OMAP_OHCI_PORT_MODE_PHY_6PIN_DPDM:
 178                 return OMAP_TLL_FSLSMODE_6PIN_PHY_DP_DM;
 179
 180         case OMAP_OHCI_PORT_MODE_PHY_3PIN_DATSE0:
 181                 return OMAP_TLL_FSLSMODE_3PIN_PHY;
 182
 183         case OMAP_OHCI_PORT_MODE_PHY_4PIN_DPDM:
 184                 return OMAP_TLL_FSLSMODE_4PIN_PHY;
 185
 186         case OMAP_OHCI_PORT_MODE_TLL_6PIN_DATSE0:
 187                 return OMAP_TLL_FSLSMODE_6PIN_TLL_DAT_SE0;
 188
 189         case OMAP_OHCI_PORT_MODE_TLL_6PIN_DPDM:
 190                 return OMAP_TLL_FSLSMODE_6PIN_TLL_DP_DM;
 191
 192         case OMAP_OHCI_PORT_MODE_TLL_3PIN_DATSE0:
 193                 return OMAP_TLL_FSLSMODE_3PIN_TLL;
 194
 195         case OMAP_OHCI_PORT_MODE_TLL_4PIN_DPDM:
 196                 return OMAP_TLL_FSLSMODE_4PIN_TLL;
 197
 198         case OMAP_OHCI_PORT_MODE_TLL_2PIN_DATSE0:
 199                 return OMAP_TLL_FSLSMODE_2PIN_TLL_DAT_SE0;
 200
 201         case OMAP_OHCI_PORT_MODE_TLL_2PIN_DPDM:
 202                 return OMAP_TLL_FSLSMODE_2PIN_DAT_DP_DM;
 203         default:
 204                 pr_warn("Invalid port mode, using default\n");
 205                 return OMAP_TLL_FSLSMODE_6PIN_PHY_DAT_SE0;
 206         }
 207 }
 208
 209 /**
 210  * usbtll_omap_probe - initialize TI-based HCDs
 211  *
 212  * Allocates basic resources for this USB host controller.
 213  */
 214 static int usbtll_omap_probe(struct platform_device *pdev)
 215 {
 216         struct device                           *dev =  &pdev->dev;
 217         struct resource                         *res;
 218         struct usbtll_omap                      *tll;
 219         int                                     ret = 0;
 220         int                                     i, ver;
 221
 222         dev_dbg(dev, "starting TI HSUSB TLL Controller\n");
 223
 224         tll = devm_kzalloc(dev, sizeof(struct usbtll_omap), GFP_KERNEL);
 225         if (!tll) {
 226                 dev_err(dev, "Memory allocation failed\n");
 227                 return -ENOMEM;
 228         }
 229
 230         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 231         tll->base = devm_ioremap_resource(dev, res);
 232         if (IS_ERR(tll->base))
 233                 return PTR_ERR(tll->base);
 234
 235         platform_set_drvdata(pdev, tll);
 236         pm_runtime_enable(dev);
 237         pm_runtime_get_sync(dev);
 238
 239         ver =  usbtll_read(tll->base, OMAP_USBTLL_REVISION);
 240         switch (ver) {
 241         case OMAP_USBTLL_REV1:
 242         case OMAP_USBTLL_REV4:
 243                 tll->nch = OMAP_TLL_CHANNEL_COUNT;
 244                 break;
 245         case OMAP_USBTLL_REV2:
 246         case OMAP_USBTLL_REV3:
 247                 tll->nch = OMAP_REV2_TLL_CHANNEL_COUNT;
 248                 break;
 249         default:
 250                 tll->nch = OMAP_TLL_CHANNEL_COUNT;
 251                 dev_dbg(dev,
 252                  "USB TLL Rev : 0x%x not recognized, assuming %d channels\n",
 253                         ver, tll->nch);
 254                 break;
 255         }
 256
 257         tll->ch_clk = devm_kzalloc(dev, sizeof(struct clk *) * tll->nch,
 258                                                 GFP_KERNEL);
 259         if (!tll->ch_clk) {
 260                 ret = -ENOMEM;
 261                 dev_err(dev, "Couldn't allocate memory for channel clocks\n");
 262                 goto err_clk_alloc;
 263         }
 264
 265         for (i = 0; i < tll->nch; i++) {
 266                 char clkname[] = "usb_tll_hs_usb_chx_clk";
 267
 268                 snprintf(clkname, sizeof(clkname),
 269                                         "usb_tll_hs_usb_ch%d_clk", i);
 270                 tll->ch_clk[i] = clk_get(dev, clkname);
 271
 272                 if (IS_ERR(tll->ch_clk[i]))
 273                         dev_dbg(dev, "can't get clock : %s\n", clkname);
 274                 else
 275                         clk_prepare(tll->ch_clk[i]);
 276         }
 277
 278         pm_runtime_put_sync(dev);
 279         /* only after this can omap_tll_enable/disable work */
 280         spin_lock(&tll_lock);
 281         tll_dev = dev;
 282         spin_unlock(&tll_lock);
 283
 284         return 0;
 285
 286 err_clk_alloc:
 287         pm_runtime_put_sync(dev);
 288         pm_runtime_disable(dev);
 289
 290         return ret;
 291 }
 292
 293 /**
 294  * usbtll_omap_remove - shutdown processing for UHH & TLL HCDs
 295  * @pdev: USB Host Controller being removed
 296  *
 297  * Reverses the effect of usbtll_omap_probe().
 298  */
 299 static int usbtll_omap_remove(struct platform_device *pdev)
 300 {
 301         struct usbtll_omap *tll = platform_get_drvdata(pdev);
 302         int i;
 303
 304         spin_lock(&tll_lock);
 305         tll_dev = NULL;
 306         spin_unlock(&tll_lock);
 307
 308         for (i = 0; i < tll->nch; i++) {
 309                 if (!IS_ERR(tll->ch_clk[i])) {
 310                         clk_unprepare(tll->ch_clk[i]);
 311                         clk_put(tll->ch_clk[i]);
 312                 }
 313         }
 314
 315         pm_runtime_disable(&pdev->dev);
 316         return 0;
 317 }
 318
 319 static const struct of_device_id usbtll_omap_dt_ids[] = {
 320         { .compatible = "ti,usbhs-tll" },
 321         { }
 322 };
 323
 324 MODULE_DEVICE_TABLE(of, usbtll_omap_dt_ids);
 325
 326 static struct platform_driver usbtll_omap_driver = {
 327         .driver = {
 328                 .name           = (char *)usbtll_driver_name,
 329                 .of_match_table = usbtll_omap_dt_ids,
 330         },
 331         .probe          = usbtll_omap_probe,
 332         .remove         = usbtll_omap_remove,
 333 };
 334
 335 int omap_tll_init(struct usbhs_omap_platform_data *pdata)
 336 {
 337         int i;
 338         bool needs_tll;
 339         unsigned reg;
 340         struct usbtll_omap *tll;
 341
 342         if (!tll_dev)
 343                 return -ENODEV;
 344
 345         pm_runtime_get_sync(tll_dev);
 346
 347         spin_lock(&tll_lock);
 348         tll = dev_get_drvdata(tll_dev);
 349         needs_tll = false;
 350         for (i = 0; i < tll->nch; i++)
 351                 needs_tll |= omap_usb_mode_needs_tll(pdata->port_mode[i]);
 352
 353         if (needs_tll) {
 354                 void __iomem *base = tll->base;
 355
 356                 /* Program Common TLL register */
 357                 reg = usbtll_read(base, OMAP_TLL_SHARED_CONF);
 358                 reg |= (OMAP_TLL_SHARED_CONF_FCLK_IS_ON
 359                         | OMAP_TLL_SHARED_CONF_USB_DIVRATION);
 360                 reg &= ~OMAP_TLL_SHARED_CONF_USB_90D_DDR_EN;
 361                 reg &= ~OMAP_TLL_SHARED_CONF_USB_180D_SDR_EN;
 362
 363                 usbtll_write(base, OMAP_TLL_SHARED_CONF, reg);
 364
 365                 /* Enable channels now */
 366                 for (i = 0; i < tll->nch; i++) {
 367                         reg = usbtll_read(base, OMAP_TLL_CHANNEL_CONF(i));
 368
 369                         if (is_ohci_port(pdata->port_mode[i])) {
 370                                 reg |= ohci_omap3_fslsmode(pdata->port_mode[i])
 371                                 << OMAP_TLL_CHANNEL_CONF_FSLSMODE_SHIFT;
 372                                 reg |= OMAP_TLL_CHANNEL_CONF_CHANMODE_FSLS;
 373                         } else if (pdata->port_mode[i] ==
 374                                         OMAP_EHCI_PORT_MODE_TLL) {
 375                                 /*
 376                                  * Disable AutoIdle, BitStuffing
 377                                  * and use SDR Mode
 378                                  */
 379                                 reg &= ~(OMAP_TLL_CHANNEL_CONF_UTMIAUTOIDLE
 380                                         | OMAP_TLL_CHANNEL_CONF_ULPINOBITSTUFF
 381                                         | OMAP_TLL_CHANNEL_CONF_ULPIDDRMODE);
 382                         } else if (pdata->port_mode[i] ==
 383                                         OMAP_EHCI_PORT_MODE_HSIC) {
 384                                 /*
 385                                  * HSIC Mode requires UTMI port configurations
 386                                  */
 387                                 reg |= OMAP_TLL_CHANNEL_CONF_DRVVBUS
 388                                  | OMAP_TLL_CHANNEL_CONF_CHRGVBUS
 389                                  | OMAP_TLL_CHANNEL_CONF_MODE_TRANSPARENT_UTMI
 390                                  | OMAP_TLL_CHANNEL_CONF_ULPINOBITSTUFF;
 391                         } else {
 392                                 continue;
 393                         }
 394                         reg |= OMAP_TLL_CHANNEL_CONF_CHANEN;
 395                         usbtll_write(base, OMAP_TLL_CHANNEL_CONF(i), reg);
 396
 397                         usbtll_writeb(base,
 398                                       OMAP_TLL_ULPI_SCRATCH_REGISTER(i),
 399                                       0xbe);
 400                 }
 401         }
 402
 403         spin_unlock(&tll_lock);
 404         pm_runtime_put_sync(tll_dev);
 405
 406         return 0;
 407 }
 408 EXPORT_SYMBOL_GPL(omap_tll_init);
 409
 410 int omap_tll_enable(struct usbhs_omap_platform_data *pdata)
 411 {
 412         int i;
 413         struct usbtll_omap *tll;
 414
 415         if (!tll_dev)
 416                 return -ENODEV;
 417
 418         pm_runtime_get_sync(tll_dev);
 419
 420         spin_lock(&tll_lock);
 421         tll = dev_get_drvdata(tll_dev);
 422
 423         for (i = 0; i < tll->nch; i++) {
 424                 if (omap_usb_mode_needs_tll(pdata->port_mode[i])) {
 425                         int r;
 426
 427                         if (IS_ERR(tll->ch_clk[i]))
 428                                 continue;
 429
 430                         r = clk_enable(tll->ch_clk[i]);
 431                         if (r) {
 432                                 dev_err(tll_dev,
 433                                  "Error enabling ch %d clock: %d\n", i, r);
 434                         }
 435                 }
 436         }
 437
 438         spin_unlock(&tll_lock);
 439
 440         return 0;
 441 }
 442 EXPORT_SYMBOL_GPL(omap_tll_enable);
 443
 444 int omap_tll_disable(struct usbhs_omap_platform_data *pdata)
 445 {
 446         int i;
 447         struct usbtll_omap *tll;
 448
 449         if (!tll_dev)
 450                 return -ENODEV;
 451
 452         spin_lock(&tll_lock);
 453         tll = dev_get_drvdata(tll_dev);
 454
 455         for (i = 0; i < tll->nch; i++) {
 456                 if (omap_usb_mode_needs_tll(pdata->port_mode[i])) {
 457                         if (!IS_ERR(tll->ch_clk[i]))
 458                                 clk_disable(tll->ch_clk[i]);
 459                 }
 460         }
 461
 462         spin_unlock(&tll_lock);
 463         pm_runtime_put_sync(tll_dev);
 464
 465         return 0;
 466 }
 467 EXPORT_SYMBOL_GPL(omap_tll_disable);
 468
 469 MODULE_AUTHOR("Keshava Munegowda <keshava_mgowda@ti.com>");
 470 MODULE_AUTHOR("Roger Quadros <rogerq@ti.com>");
 471 MODULE_ALIAS("platform:" USBHS_DRIVER_NAME);
 472 MODULE_LICENSE("GPL v2");
 473 MODULE_DESCRIPTION("usb tll driver for TI OMAP EHCI and OHCI controllers");
 474
 475 static int __init omap_usbtll_drvinit(void)
 476 {
 477         return platform_driver_register(&usbtll_omap_driver);
 478 }
 479
 480 /*
 481  * init before usbhs core driver;
 482  * The usbtll driver should be initialized before
 483  * the usbhs core driver probe function is called.
 484  */
 485 fs_initcall(omap_usbtll_drvinit);
 486
 487 static void __exit omap_usbtll_drvexit(void)
 488 {
 489         platform_driver_unregister(&usbtll_omap_driver);
 490 }
 491 module_exit(omap_usbtll_drvexit);