drivers/mfd/omap-usb-tll.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * omap-usb-tll.c - The USB TLL driver for OMAP EHCI & OHCI
   4  *
   5  * Copyright (C) 2012-2013 Texas Instruments Incorporated - https://www.ti.com
   6  * Author: Keshava Munegowda <keshava_mgowda@ti.com>
   7  * Author: Roger Quadros <rogerq@ti.com>
   8  */
   9 #include <linux/kernel.h>
  10 #include <linux/module.h>
  11 #include <linux/types.h>
  12 #include <linux/slab.h>
  13 #include <linux/spinlock.h>
  14 #include <linux/platform_device.h>
  15 #include <linux/clk.h>
  16 #include <linux/io.h>
  17 #include <linux/err.h>
  18 #include <linux/pm_runtime.h>
  19 #include <linux/platform_data/usb-omap.h>
  20 #include <linux/of.h>
  21
  22 #include "omap-usb.h"
  23
  24 #define USBTLL_DRIVER_NAME      "usbhs_tll"
  25
  26 /* TLL Register Set */
  27 #define OMAP_USBTLL_REVISION                            (0x00)
  28 #define OMAP_USBTLL_SYSCONFIG                           (0x10)
  29 #define OMAP_USBTLL_SYSCONFIG_CACTIVITY                 (1 << 8)
  30 #define OMAP_USBTLL_SYSCONFIG_SIDLEMODE                 (1 << 3)
  31 #define OMAP_USBTLL_SYSCONFIG_ENAWAKEUP                 (1 << 2)
  32 #define OMAP_USBTLL_SYSCONFIG_SOFTRESET                 (1 << 1)
  33 #define OMAP_USBTLL_SYSCONFIG_AUTOIDLE                  (1 << 0)
  34
  35 #define OMAP_USBTLL_SYSSTATUS                           (0x14)
  36 #define OMAP_USBTLL_SYSSTATUS_RESETDONE                 (1 << 0)
  37
  38 #define OMAP_USBTLL_IRQSTATUS                           (0x18)
  39 #define OMAP_USBTLL_IRQENABLE                           (0x1C)
  40
  41 #define OMAP_TLL_SHARED_CONF                            (0x30)
  42 #define OMAP_TLL_SHARED_CONF_USB_90D_DDR_EN             (1 << 6)
  43 #define OMAP_TLL_SHARED_CONF_USB_180D_SDR_EN            (1 << 5)
  44 #define OMAP_TLL_SHARED_CONF_USB_DIVRATION              (1 << 2)
  45 #define OMAP_TLL_SHARED_CONF_FCLK_REQ                   (1 << 1)
  46 #define OMAP_TLL_SHARED_CONF_FCLK_IS_ON                 (1 << 0)
  47
  48 #define OMAP_TLL_CHANNEL_CONF(num)                      (0x040 + 0x004 * num)
  49 #define OMAP_TLL_CHANNEL_CONF_FSLSMODE_SHIFT            24
  50 #define OMAP_TLL_CHANNEL_CONF_DRVVBUS                   (1 << 16)
  51 #define OMAP_TLL_CHANNEL_CONF_CHRGVBUS                  (1 << 15)
  52 #define OMAP_TLL_CHANNEL_CONF_ULPINOBITSTUFF            (1 << 11)
  53 #define OMAP_TLL_CHANNEL_CONF_ULPI_ULPIAUTOIDLE         (1 << 10)
  54 #define OMAP_TLL_CHANNEL_CONF_UTMIAUTOIDLE              (1 << 9)
  55 #define OMAP_TLL_CHANNEL_CONF_ULPIDDRMODE               (1 << 8)
  56 #define OMAP_TLL_CHANNEL_CONF_MODE_TRANSPARENT_UTMI     (2 << 1)
  57 #define OMAP_TLL_CHANNEL_CONF_CHANMODE_FSLS             (1 << 1)
  58 #define OMAP_TLL_CHANNEL_CONF_CHANEN                    (1 << 0)
  59
  60 #define OMAP_TLL_FSLSMODE_6PIN_PHY_DAT_SE0              0x0
  61 #define OMAP_TLL_FSLSMODE_6PIN_PHY_DP_DM                0x1
  62 #define OMAP_TLL_FSLSMODE_3PIN_PHY                      0x2
  63 #define OMAP_TLL_FSLSMODE_4PIN_PHY                      0x3
  64 #define OMAP_TLL_FSLSMODE_6PIN_TLL_DAT_SE0              0x4
  65 #define OMAP_TLL_FSLSMODE_6PIN_TLL_DP_DM                0x5
  66 #define OMAP_TLL_FSLSMODE_3PIN_TLL                      0x6
  67 #define OMAP_TLL_FSLSMODE_4PIN_TLL                      0x7
  68 #define OMAP_TLL_FSLSMODE_2PIN_TLL_DAT_SE0              0xA
  69 #define OMAP_TLL_FSLSMODE_2PIN_DAT_DP_DM                0xB
  70
  71 #define OMAP_TLL_ULPI_FUNCTION_CTRL(num)                (0x804 + 0x100 * num)
  72 #define OMAP_TLL_ULPI_INTERFACE_CTRL(num)               (0x807 + 0x100 * num)
  73 #define OMAP_TLL_ULPI_OTG_CTRL(num)                     (0x80A + 0x100 * num)
  74 #define OMAP_TLL_ULPI_INT_EN_RISE(num)                  (0x80D + 0x100 * num)
  75 #define OMAP_TLL_ULPI_INT_EN_FALL(num)                  (0x810 + 0x100 * num)
  76 #define OMAP_TLL_ULPI_INT_STATUS(num)                   (0x813 + 0x100 * num)
  77 #define OMAP_TLL_ULPI_INT_LATCH(num)                    (0x814 + 0x100 * num)
  78 #define OMAP_TLL_ULPI_DEBUG(num)                        (0x815 + 0x100 * num)
  79 #define OMAP_TLL_ULPI_SCRATCH_REGISTER(num)             (0x816 + 0x100 * num)
  80
  81 #define OMAP_REV2_TLL_CHANNEL_COUNT                     2
  82 #define OMAP_TLL_CHANNEL_COUNT                          3
  83 #define OMAP_TLL_CHANNEL_1_EN_MASK                      (1 << 0)
  84 #define OMAP_TLL_CHANNEL_2_EN_MASK                      (1 << 1)
  85 #define OMAP_TLL_CHANNEL_3_EN_MASK                      (1 << 2)
  86
  87 /* Values of USBTLL_REVISION - Note: these are not given in the TRM */
  88 #define OMAP_USBTLL_REV1                0x00000015      /* OMAP3 */
  89 #define OMAP_USBTLL_REV2                0x00000018      /* OMAP 3630 */
  90 #define OMAP_USBTLL_REV3                0x00000004      /* OMAP4 */
  91 #define OMAP_USBTLL_REV4                0x00000006      /* OMAP5 */
  92
  93 #define is_ehci_tll_mode(x)     (x == OMAP_EHCI_PORT_MODE_TLL)
  94
  95 /* only PHY and UNUSED modes don't need TLL */
  96 #define omap_usb_mode_needs_tll(x)      ((x) != OMAP_USBHS_PORT_MODE_UNUSED &&\
  97                                          (x) != OMAP_EHCI_PORT_MODE_PHY)
  98
  99 struct usbtll_omap {
 100         void __iomem    *base;
 101         int             nch;            /* num. of channels */
 102         struct clk      *ch_clk[];      /* must be the last member */
 103 };
 104
 105 /*-------------------------------------------------------------------------*/
 106
 107 static const char usbtll_driver_name[] = USBTLL_DRIVER_NAME;
 108 static struct device    *tll_dev;
 109 static DEFINE_SPINLOCK(tll_lock);       /* serialize access to tll_dev */
 110
 111 /*-------------------------------------------------------------------------*/
 112
 113 static inline void usbtll_write(void __iomem *base, u32 reg, u32 val)
 114 {
 115         writel_relaxed(val, base + reg);
 116 }
 117
 118 static inline u32 usbtll_read(void __iomem *base, u32 reg)
 119 {
 120         return readl_relaxed(base + reg);
 121 }
 122
 123 static inline void usbtll_writeb(void __iomem *base, u32 reg, u8 val)
 124 {
 125         writeb_relaxed(val, base + reg);
 126 }
 127
 128 /*-------------------------------------------------------------------------*/
 129
 130 static bool is_ohci_port(enum usbhs_omap_port_mode pmode)
 131 {
 132         switch (pmode) {
 133         case OMAP_OHCI_PORT_MODE_PHY_6PIN_DATSE0:
 134         case OMAP_OHCI_PORT_MODE_PHY_6PIN_DPDM:
 135         case OMAP_OHCI_PORT_MODE_PHY_3PIN_DATSE0:
 136         case OMAP_OHCI_PORT_MODE_PHY_4PIN_DPDM:
 137         case OMAP_OHCI_PORT_MODE_TLL_6PIN_DATSE0:
 138         case OMAP_OHCI_PORT_MODE_TLL_6PIN_DPDM:
 139         case OMAP_OHCI_PORT_MODE_TLL_3PIN_DATSE0:
 140         case OMAP_OHCI_PORT_MODE_TLL_4PIN_DPDM:
 141         case OMAP_OHCI_PORT_MODE_TLL_2PIN_DATSE0:
 142         case OMAP_OHCI_PORT_MODE_TLL_2PIN_DPDM:
 143                 return true;
 144
 145         default:
 146                 return false;
 147         }
 148 }
 149
 150 /*
 151  * convert the port-mode enum to a value we can use in the FSLSMODE
 152  * field of USBTLL_CHANNEL_CONF
 153  */
 154 static unsigned ohci_omap3_fslsmode(enum usbhs_omap_port_mode mode)
 155 {
 156         switch (mode) {
 157         case OMAP_USBHS_PORT_MODE_UNUSED:
 158         case OMAP_OHCI_PORT_MODE_PHY_6PIN_DATSE0:
 159                 return OMAP_TLL_FSLSMODE_6PIN_PHY_DAT_SE0;
 160
 161         case OMAP_OHCI_PORT_MODE_PHY_6PIN_DPDM:
 162                 return OMAP_TLL_FSLSMODE_6PIN_PHY_DP_DM;
 163
 164         case OMAP_OHCI_PORT_MODE_PHY_3PIN_DATSE0:
 165                 return OMAP_TLL_FSLSMODE_3PIN_PHY;
 166
 167         case OMAP_OHCI_PORT_MODE_PHY_4PIN_DPDM:
 168                 return OMAP_TLL_FSLSMODE_4PIN_PHY;
 169
 170         case OMAP_OHCI_PORT_MODE_TLL_6PIN_DATSE0:
 171                 return OMAP_TLL_FSLSMODE_6PIN_TLL_DAT_SE0;
 172
 173         case OMAP_OHCI_PORT_MODE_TLL_6PIN_DPDM:
 174                 return OMAP_TLL_FSLSMODE_6PIN_TLL_DP_DM;
 175
 176         case OMAP_OHCI_PORT_MODE_TLL_3PIN_DATSE0:
 177                 return OMAP_TLL_FSLSMODE_3PIN_TLL;
 178
 179         case OMAP_OHCI_PORT_MODE_TLL_4PIN_DPDM:
 180                 return OMAP_TLL_FSLSMODE_4PIN_TLL;
 181
 182         case OMAP_OHCI_PORT_MODE_TLL_2PIN_DATSE0:
 183                 return OMAP_TLL_FSLSMODE_2PIN_TLL_DAT_SE0;
 184
 185         case OMAP_OHCI_PORT_MODE_TLL_2PIN_DPDM:
 186                 return OMAP_TLL_FSLSMODE_2PIN_DAT_DP_DM;
 187         default:
 188                 pr_warn("Invalid port mode, using default\n");
 189                 return OMAP_TLL_FSLSMODE_6PIN_PHY_DAT_SE0;
 190         }
 191 }
 192
 193 /**
 194  * usbtll_omap_probe - initialize TI-based HCDs
 195  *
 196  * Allocates basic resources for this USB host controller.
 197  *
 198  * @pdev: Pointer to this device's platform device structure
 199  */
 200 static int usbtll_omap_probe(struct platform_device *pdev)
 201 {
 202         struct device                           *dev =  &pdev->dev;
 203         struct usbtll_omap                      *tll;
 204         void __iomem                            *base;
 205         int                                     i, nch, ver;
 206
 207         dev_dbg(dev, "starting TI HSUSB TLL Controller\n");
 208
 209         base = devm_platform_ioremap_resource(pdev, 0);
 210         if (IS_ERR(base))
 211                 return PTR_ERR(base);
 212
 213         pm_runtime_enable(dev);
 214         pm_runtime_get_sync(dev);
 215
 216         ver = usbtll_read(base, OMAP_USBTLL_REVISION);
 217         switch (ver) {
 218         case OMAP_USBTLL_REV1:
 219         case OMAP_USBTLL_REV4:
 220                 nch = OMAP_TLL_CHANNEL_COUNT;
 221                 break;
 222         case OMAP_USBTLL_REV2:
 223         case OMAP_USBTLL_REV3:
 224                 nch = OMAP_REV2_TLL_CHANNEL_COUNT;
 225                 break;
 226         default:
 227                 nch = OMAP_TLL_CHANNEL_COUNT;
 228                 dev_dbg(dev, "rev 0x%x not recognized, assuming %d channels\n",
 229                         ver, nch);
 230                 break;
 231         }
 232
 233         tll = devm_kzalloc(dev, sizeof(*tll) + sizeof(tll->ch_clk[nch]),
 234                            GFP_KERNEL);
 235         if (!tll) {
 236                 pm_runtime_put_sync(dev);
 237                 pm_runtime_disable(dev);
 238                 return -ENOMEM;
 239         }
 240
 241         tll->base = base;
 242         tll->nch = nch;
 243         platform_set_drvdata(pdev, tll);
 244
 245         for (i = 0; i < nch; i++) {
 246                 char clkname[] = "usb_tll_hs_usb_chx_clk";
 247
 248                 snprintf(clkname, sizeof(clkname),
 249                                         "usb_tll_hs_usb_ch%d_clk", i);
 250                 tll->ch_clk[i] = clk_get(dev, clkname);
 251
 252                 if (IS_ERR(tll->ch_clk[i]))
 253                         dev_dbg(dev, "can't get clock : %s\n", clkname);
 254                 else
 255                         clk_prepare(tll->ch_clk[i]);
 256         }
 257
 258         pm_runtime_put_sync(dev);
 259         /* only after this can omap_tll_enable/disable work */
 260         spin_lock(&tll_lock);
 261         tll_dev = dev;
 262         spin_unlock(&tll_lock);
 263
 264         return 0;
 265 }
 266
 267 /**
 268  * usbtll_omap_remove - shutdown processing for UHH & TLL HCDs
 269  * @pdev: USB Host Controller being removed
 270  *
 271  * Reverses the effect of usbtll_omap_probe().
 272  */
 273 static int usbtll_omap_remove(struct platform_device *pdev)
 274 {
 275         struct usbtll_omap *tll = platform_get_drvdata(pdev);
 276         int i;
 277
 278         spin_lock(&tll_lock);
 279         tll_dev = NULL;
 280         spin_unlock(&tll_lock);
 281
 282         for (i = 0; i < tll->nch; i++) {
 283                 if (!IS_ERR(tll->ch_clk[i])) {
 284                         clk_unprepare(tll->ch_clk[i]);
 285                         clk_put(tll->ch_clk[i]);
 286                 }
 287         }
 288
 289         pm_runtime_disable(&pdev->dev);
 290         return 0;
 291 }
 292
 293 static const struct of_device_id usbtll_omap_dt_ids[] = {
 294         { .compatible = "ti,usbhs-tll" },
 295         { }
 296 };
 297
 298 MODULE_DEVICE_TABLE(of, usbtll_omap_dt_ids);
 299
 300 static struct platform_driver usbtll_omap_driver = {
 301         .driver = {
 302                 .name           = usbtll_driver_name,
 303                 .of_match_table = usbtll_omap_dt_ids,
 304         },
 305         .probe          = usbtll_omap_probe,
 306         .remove         = usbtll_omap_remove,
 307 };
 308
 309 int omap_tll_init(struct usbhs_omap_platform_data *pdata)
 310 {
 311         int i;
 312         bool needs_tll;
 313         unsigned reg;
 314         struct usbtll_omap *tll;
 315
 316         if (!tll_dev)
 317                 return -ENODEV;
 318
 319         pm_runtime_get_sync(tll_dev);
 320
 321         spin_lock(&tll_lock);
 322         tll = dev_get_drvdata(tll_dev);
 323         needs_tll = false;
 324         for (i = 0; i < tll->nch; i++)
 325                 needs_tll |= omap_usb_mode_needs_tll(pdata->port_mode[i]);
 326
 327         if (needs_tll) {
 328                 void __iomem *base = tll->base;
 329
 330                 /* Program Common TLL register */
 331                 reg = usbtll_read(base, OMAP_TLL_SHARED_CONF);
 332                 reg |= (OMAP_TLL_SHARED_CONF_FCLK_IS_ON
 333                         | OMAP_TLL_SHARED_CONF_USB_DIVRATION);
 334                 reg &= ~OMAP_TLL_SHARED_CONF_USB_90D_DDR_EN;
 335                 reg &= ~OMAP_TLL_SHARED_CONF_USB_180D_SDR_EN;
 336
 337                 usbtll_write(base, OMAP_TLL_SHARED_CONF, reg);
 338
 339                 /* Enable channels now */
 340                 for (i = 0; i < tll->nch; i++) {
 341                         reg = usbtll_read(base, OMAP_TLL_CHANNEL_CONF(i));
 342
 343                         if (is_ohci_port(pdata->port_mode[i])) {
 344                                 reg |= ohci_omap3_fslsmode(pdata->port_mode[i])
 345                                 << OMAP_TLL_CHANNEL_CONF_FSLSMODE_SHIFT;
 346                                 reg |= OMAP_TLL_CHANNEL_CONF_CHANMODE_FSLS;
 347                         } else if (pdata->port_mode[i] ==
 348                                         OMAP_EHCI_PORT_MODE_TLL) {
 349                                 /*
 350                                  * Disable UTMI AutoIdle, BitStuffing
 351                                  * and use SDR Mode. Enable ULPI AutoIdle.
 352                                  */
 353                                 reg &= ~(OMAP_TLL_CHANNEL_CONF_UTMIAUTOIDLE
 354                                         | OMAP_TLL_CHANNEL_CONF_ULPIDDRMODE);
 355                                 reg |= OMAP_TLL_CHANNEL_CONF_ULPINOBITSTUFF;
 356                                 reg |= OMAP_TLL_CHANNEL_CONF_ULPI_ULPIAUTOIDLE;
 357                         } else if (pdata->port_mode[i] ==
 358                                         OMAP_EHCI_PORT_MODE_HSIC) {
 359                                 /*
 360                                  * HSIC Mode requires UTMI port configurations
 361                                  */
 362                                 reg |= OMAP_TLL_CHANNEL_CONF_DRVVBUS
 363                                  | OMAP_TLL_CHANNEL_CONF_CHRGVBUS
 364                                  | OMAP_TLL_CHANNEL_CONF_MODE_TRANSPARENT_UTMI
 365                                  | OMAP_TLL_CHANNEL_CONF_ULPINOBITSTUFF;
 366                         } else {
 367                                 continue;
 368                         }
 369                         reg |= OMAP_TLL_CHANNEL_CONF_CHANEN;
 370                         usbtll_write(base, OMAP_TLL_CHANNEL_CONF(i), reg);
 371
 372                         usbtll_writeb(base,
 373                                       OMAP_TLL_ULPI_SCRATCH_REGISTER(i),
 374                                       0xbe);
 375                 }
 376         }
 377
 378         spin_unlock(&tll_lock);
 379         pm_runtime_put_sync(tll_dev);
 380
 381         return 0;
 382 }
 383 EXPORT_SYMBOL_GPL(omap_tll_init);
 384
 385 int omap_tll_enable(struct usbhs_omap_platform_data *pdata)
 386 {
 387         int i;
 388         struct usbtll_omap *tll;
 389
 390         if (!tll_dev)
 391                 return -ENODEV;
 392
 393         pm_runtime_get_sync(tll_dev);
 394
 395         spin_lock(&tll_lock);
 396         tll = dev_get_drvdata(tll_dev);
 397
 398         for (i = 0; i < tll->nch; i++) {
 399                 if (omap_usb_mode_needs_tll(pdata->port_mode[i])) {
 400                         int r;
 401
 402                         if (IS_ERR(tll->ch_clk[i]))
 403                                 continue;
 404
 405                         r = clk_enable(tll->ch_clk[i]);
 406                         if (r) {
 407                                 dev_err(tll_dev,
 408                                  "Error enabling ch %d clock: %d\n", i, r);
 409                         }
 410                 }
 411         }
 412
 413         spin_unlock(&tll_lock);
 414
 415         return 0;
 416 }
 417 EXPORT_SYMBOL_GPL(omap_tll_enable);
 418
 419 int omap_tll_disable(struct usbhs_omap_platform_data *pdata)
 420 {
 421         int i;
 422         struct usbtll_omap *tll;
 423
 424         if (!tll_dev)
 425                 return -ENODEV;
 426
 427         spin_lock(&tll_lock);
 428         tll = dev_get_drvdata(tll_dev);
 429
 430         for (i = 0; i < tll->nch; i++) {
 431                 if (omap_usb_mode_needs_tll(pdata->port_mode[i])) {
 432                         if (!IS_ERR(tll->ch_clk[i]))
 433                                 clk_disable(tll->ch_clk[i]);
 434                 }
 435         }
 436
 437         spin_unlock(&tll_lock);
 438         pm_runtime_put_sync(tll_dev);
 439
 440         return 0;
 441 }
 442 EXPORT_SYMBOL_GPL(omap_tll_disable);
 443
 444 MODULE_AUTHOR("Keshava Munegowda <keshava_mgowda@ti.com>");
 445 MODULE_AUTHOR("Roger Quadros <rogerq@ti.com>");
 446 MODULE_DESCRIPTION("usb tll driver for TI OMAP EHCI and OHCI controllers");
 447
 448 static int __init omap_usbtll_drvinit(void)
 449 {
 450         return platform_driver_register(&usbtll_omap_driver);
 451 }
 452
 453 /*
 454  * init before usbhs core driver;
 455  * The usbtll driver should be initialized before
 456  * the usbhs core driver probe function is called.
 457  */
 458 fs_initcall(omap_usbtll_drvinit);
 459
 460 static void __exit omap_usbtll_drvexit(void)
 461 {
 462         platform_driver_unregister(&usbtll_omap_driver);
 463 }
 464 module_exit(omap_usbtll_drvexit);