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; 102 struct clk *ch_clk[] __counted_by(nch); 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, struct_size(tll, ch_clk, nch), GFP_KERNEL); 234 if (!tll) { 235 pm_runtime_put_sync(dev); 236 pm_runtime_disable(dev); 237 return -ENOMEM; 238 } 239 240 tll->base = base; 241 tll->nch = nch; 242 platform_set_drvdata(pdev, tll); 243 244 for (i = 0; i < nch; i++) { 245 char clkname[] = "usb_tll_hs_usb_chx_clk"; 246 247 snprintf(clkname, sizeof(clkname), 248 "usb_tll_hs_usb_ch%d_clk", i); 249 tll->ch_clk[i] = clk_get(dev, clkname); 250 251 if (IS_ERR(tll->ch_clk[i])) 252 dev_dbg(dev, "can't get clock : %s\n", clkname); 253 else 254 clk_prepare(tll->ch_clk[i]); 255 } 256 257 pm_runtime_put_sync(dev); 258 /* only after this can omap_tll_enable/disable work */ 259 spin_lock(&tll_lock); 260 tll_dev = dev; 261 spin_unlock(&tll_lock); 262 263 return 0; 264 } 265 266 /** 267 * usbtll_omap_remove - shutdown processing for UHH & TLL HCDs 268 * @pdev: USB Host Controller being removed 269 * 270 * Reverses the effect of usbtll_omap_probe(). 271 */ 272 static void usbtll_omap_remove(struct platform_device *pdev) 273 { 274 struct usbtll_omap *tll = platform_get_drvdata(pdev); 275 int i; 276 277 spin_lock(&tll_lock); 278 tll_dev = NULL; 279 spin_unlock(&tll_lock); 280 281 for (i = 0; i < tll->nch; i++) { 282 if (!IS_ERR(tll->ch_clk[i])) { 283 clk_unprepare(tll->ch_clk[i]); 284 clk_put(tll->ch_clk[i]); 285 } 286 } 287 288 pm_runtime_disable(&pdev->dev); 289 } 290 291 static const struct of_device_id usbtll_omap_dt_ids[] = { 292 { .compatible = "ti,usbhs-tll" }, 293 { } 294 }; 295 296 MODULE_DEVICE_TABLE(of, usbtll_omap_dt_ids); 297 298 static struct platform_driver usbtll_omap_driver = { 299 .driver = { 300 .name = usbtll_driver_name, 301 .of_match_table = usbtll_omap_dt_ids, 302 }, 303 .probe = usbtll_omap_probe, 304 .remove = usbtll_omap_remove, 305 }; 306 307 int omap_tll_init(struct usbhs_omap_platform_data *pdata) 308 { 309 int i; 310 bool needs_tll; 311 unsigned reg; 312 struct usbtll_omap *tll; 313 314 if (!tll_dev) 315 return -ENODEV; 316 317 pm_runtime_get_sync(tll_dev); 318 319 spin_lock(&tll_lock); 320 tll = dev_get_drvdata(tll_dev); 321 needs_tll = false; 322 for (i = 0; i < tll->nch; i++) 323 needs_tll |= omap_usb_mode_needs_tll(pdata->port_mode[i]); 324 325 if (needs_tll) { 326 void __iomem *base = tll->base; 327 328 /* Program Common TLL register */ 329 reg = usbtll_read(base, OMAP_TLL_SHARED_CONF); 330 reg |= (OMAP_TLL_SHARED_CONF_FCLK_IS_ON 331 | OMAP_TLL_SHARED_CONF_USB_DIVRATION); 332 reg &= ~OMAP_TLL_SHARED_CONF_USB_90D_DDR_EN; 333 reg &= ~OMAP_TLL_SHARED_CONF_USB_180D_SDR_EN; 334 335 usbtll_write(base, OMAP_TLL_SHARED_CONF, reg); 336 337 /* Enable channels now */ 338 for (i = 0; i < tll->nch; i++) { 339 reg = usbtll_read(base, OMAP_TLL_CHANNEL_CONF(i)); 340 341 if (is_ohci_port(pdata->port_mode[i])) { 342 reg |= ohci_omap3_fslsmode(pdata->port_mode[i]) 343 << OMAP_TLL_CHANNEL_CONF_FSLSMODE_SHIFT; 344 reg |= OMAP_TLL_CHANNEL_CONF_CHANMODE_FSLS; 345 } else if (pdata->port_mode[i] == 346 OMAP_EHCI_PORT_MODE_TLL) { 347 /* 348 * Disable UTMI AutoIdle, BitStuffing 349 * and use SDR Mode. Enable ULPI AutoIdle. 350 */ 351 reg &= ~(OMAP_TLL_CHANNEL_CONF_UTMIAUTOIDLE 352 | OMAP_TLL_CHANNEL_CONF_ULPIDDRMODE); 353 reg |= OMAP_TLL_CHANNEL_CONF_ULPINOBITSTUFF; 354 reg |= OMAP_TLL_CHANNEL_CONF_ULPI_ULPIAUTOIDLE; 355 } else if (pdata->port_mode[i] == 356 OMAP_EHCI_PORT_MODE_HSIC) { 357 /* 358 * HSIC Mode requires UTMI port configurations 359 */ 360 reg |= OMAP_TLL_CHANNEL_CONF_DRVVBUS 361 | OMAP_TLL_CHANNEL_CONF_CHRGVBUS 362 | OMAP_TLL_CHANNEL_CONF_MODE_TRANSPARENT_UTMI 363 | OMAP_TLL_CHANNEL_CONF_ULPINOBITSTUFF; 364 } else { 365 continue; 366 } 367 reg |= OMAP_TLL_CHANNEL_CONF_CHANEN; 368 usbtll_write(base, OMAP_TLL_CHANNEL_CONF(i), reg); 369 370 usbtll_writeb(base, 371 OMAP_TLL_ULPI_SCRATCH_REGISTER(i), 372 0xbe); 373 } 374 } 375 376 spin_unlock(&tll_lock); 377 pm_runtime_put_sync(tll_dev); 378 379 return 0; 380 } 381 EXPORT_SYMBOL_GPL(omap_tll_init); 382 383 int omap_tll_enable(struct usbhs_omap_platform_data *pdata) 384 { 385 int i; 386 struct usbtll_omap *tll; 387 388 if (!tll_dev) 389 return -ENODEV; 390 391 pm_runtime_get_sync(tll_dev); 392 393 spin_lock(&tll_lock); 394 tll = dev_get_drvdata(tll_dev); 395 396 for (i = 0; i < tll->nch; i++) { 397 if (omap_usb_mode_needs_tll(pdata->port_mode[i])) { 398 int r; 399 400 if (IS_ERR(tll->ch_clk[i])) 401 continue; 402 403 r = clk_enable(tll->ch_clk[i]); 404 if (r) { 405 dev_err(tll_dev, 406 "Error enabling ch %d clock: %d\n", i, r); 407 } 408 } 409 } 410 411 spin_unlock(&tll_lock); 412 413 return 0; 414 } 415 EXPORT_SYMBOL_GPL(omap_tll_enable); 416 417 int omap_tll_disable(struct usbhs_omap_platform_data *pdata) 418 { 419 int i; 420 struct usbtll_omap *tll; 421 422 if (!tll_dev) 423 return -ENODEV; 424 425 spin_lock(&tll_lock); 426 tll = dev_get_drvdata(tll_dev); 427 428 for (i = 0; i < tll->nch; i++) { 429 if (omap_usb_mode_needs_tll(pdata->port_mode[i])) { 430 if (!IS_ERR(tll->ch_clk[i])) 431 clk_disable(tll->ch_clk[i]); 432 } 433 } 434 435 spin_unlock(&tll_lock); 436 pm_runtime_put_sync(tll_dev); 437 438 return 0; 439 } 440 EXPORT_SYMBOL_GPL(omap_tll_disable); 441 442 MODULE_AUTHOR("Keshava Munegowda <keshava_mgowda@ti.com>"); 443 MODULE_AUTHOR("Roger Quadros <rogerq@ti.com>"); 444 MODULE_DESCRIPTION("usb tll driver for TI OMAP EHCI and OHCI controllers"); 445 446 static int __init omap_usbtll_drvinit(void) 447 { 448 return platform_driver_register(&usbtll_omap_driver); 449 } 450 451 /* 452 * init before usbhs core driver; 453 * The usbtll driver should be initialized before 454 * the usbhs core driver probe function is called. 455 */ 456 fs_initcall(omap_usbtll_drvinit); 457 458 static void __exit omap_usbtll_drvexit(void) 459 { 460 platform_driver_unregister(&usbtll_omap_driver); 461 } 462 module_exit(omap_usbtll_drvexit); 463