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