1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * Copyright 2012-2014 Freescale Semiconductor, Inc. 4 * Copyright (C) 2012 Marek Vasut <marex@denx.de> 5 * on behalf of DENX Software Engineering GmbH 6 */ 7 8 #include <linux/module.h> 9 #include <linux/kernel.h> 10 #include <linux/platform_device.h> 11 #include <linux/clk.h> 12 #include <linux/usb/otg.h> 13 #include <linux/stmp_device.h> 14 #include <linux/delay.h> 15 #include <linux/err.h> 16 #include <linux/io.h> 17 #include <linux/of_device.h> 18 #include <linux/regmap.h> 19 #include <linux/mfd/syscon.h> 20 #include <linux/iopoll.h> 21 22 #define DRIVER_NAME "mxs_phy" 23 24 /* Register Macro */ 25 #define HW_USBPHY_PWD 0x00 26 #define HW_USBPHY_TX 0x10 27 #define HW_USBPHY_CTRL 0x30 28 #define HW_USBPHY_CTRL_SET 0x34 29 #define HW_USBPHY_CTRL_CLR 0x38 30 31 #define HW_USBPHY_DEBUG_SET 0x54 32 #define HW_USBPHY_DEBUG_CLR 0x58 33 34 #define HW_USBPHY_IP 0x90 35 #define HW_USBPHY_IP_SET 0x94 36 #define HW_USBPHY_IP_CLR 0x98 37 38 #define GM_USBPHY_TX_TXCAL45DP(x) (((x) & 0xf) << 16) 39 #define GM_USBPHY_TX_TXCAL45DN(x) (((x) & 0xf) << 8) 40 #define GM_USBPHY_TX_D_CAL(x) (((x) & 0xf) << 0) 41 42 /* imx7ulp */ 43 #define HW_USBPHY_PLL_SIC 0xa0 44 #define HW_USBPHY_PLL_SIC_SET 0xa4 45 #define HW_USBPHY_PLL_SIC_CLR 0xa8 46 47 #define BM_USBPHY_CTRL_SFTRST BIT(31) 48 #define BM_USBPHY_CTRL_CLKGATE BIT(30) 49 #define BM_USBPHY_CTRL_OTG_ID_VALUE BIT(27) 50 #define BM_USBPHY_CTRL_ENAUTOSET_USBCLKS BIT(26) 51 #define BM_USBPHY_CTRL_ENAUTOCLR_USBCLKGATE BIT(25) 52 #define BM_USBPHY_CTRL_ENVBUSCHG_WKUP BIT(23) 53 #define BM_USBPHY_CTRL_ENIDCHG_WKUP BIT(22) 54 #define BM_USBPHY_CTRL_ENDPDMCHG_WKUP BIT(21) 55 #define BM_USBPHY_CTRL_ENAUTOCLR_PHY_PWD BIT(20) 56 #define BM_USBPHY_CTRL_ENAUTOCLR_CLKGATE BIT(19) 57 #define BM_USBPHY_CTRL_ENAUTO_PWRON_PLL BIT(18) 58 #define BM_USBPHY_CTRL_ENUTMILEVEL3 BIT(15) 59 #define BM_USBPHY_CTRL_ENUTMILEVEL2 BIT(14) 60 #define BM_USBPHY_CTRL_ENHOSTDISCONDETECT BIT(1) 61 62 #define BM_USBPHY_IP_FIX (BIT(17) | BIT(18)) 63 64 #define BM_USBPHY_DEBUG_CLKGATE BIT(30) 65 /* imx7ulp */ 66 #define BM_USBPHY_PLL_LOCK BIT(31) 67 #define BM_USBPHY_PLL_REG_ENABLE BIT(21) 68 #define BM_USBPHY_PLL_BYPASS BIT(16) 69 #define BM_USBPHY_PLL_POWER BIT(12) 70 #define BM_USBPHY_PLL_EN_USB_CLKS BIT(6) 71 72 /* Anatop Registers */ 73 #define ANADIG_ANA_MISC0 0x150 74 #define ANADIG_ANA_MISC0_SET 0x154 75 #define ANADIG_ANA_MISC0_CLR 0x158 76 77 #define ANADIG_USB1_CHRG_DETECT_SET 0x1b4 78 #define ANADIG_USB1_CHRG_DETECT_CLR 0x1b8 79 #define ANADIG_USB2_CHRG_DETECT_SET 0x214 80 #define ANADIG_USB1_CHRG_DETECT_EN_B BIT(20) 81 #define ANADIG_USB1_CHRG_DETECT_CHK_CHRG_B BIT(19) 82 #define ANADIG_USB1_CHRG_DETECT_CHK_CONTACT BIT(18) 83 84 #define ANADIG_USB1_VBUS_DET_STAT 0x1c0 85 #define ANADIG_USB1_VBUS_DET_STAT_VBUS_VALID BIT(3) 86 87 #define ANADIG_USB1_CHRG_DET_STAT 0x1d0 88 #define ANADIG_USB1_CHRG_DET_STAT_DM_STATE BIT(2) 89 #define ANADIG_USB1_CHRG_DET_STAT_CHRG_DETECTED BIT(1) 90 #define ANADIG_USB1_CHRG_DET_STAT_PLUG_CONTACT BIT(0) 91 92 #define ANADIG_USB2_VBUS_DET_STAT 0x220 93 94 #define ANADIG_USB1_LOOPBACK_SET 0x1e4 95 #define ANADIG_USB1_LOOPBACK_CLR 0x1e8 96 #define ANADIG_USB1_LOOPBACK_UTMI_TESTSTART BIT(0) 97 98 #define ANADIG_USB2_LOOPBACK_SET 0x244 99 #define ANADIG_USB2_LOOPBACK_CLR 0x248 100 101 #define ANADIG_USB1_MISC 0x1f0 102 #define ANADIG_USB2_MISC 0x250 103 104 #define BM_ANADIG_ANA_MISC0_STOP_MODE_CONFIG BIT(12) 105 #define BM_ANADIG_ANA_MISC0_STOP_MODE_CONFIG_SL BIT(11) 106 107 #define BM_ANADIG_USB1_VBUS_DET_STAT_VBUS_VALID BIT(3) 108 #define BM_ANADIG_USB2_VBUS_DET_STAT_VBUS_VALID BIT(3) 109 110 #define BM_ANADIG_USB1_LOOPBACK_UTMI_DIG_TST1 BIT(2) 111 #define BM_ANADIG_USB1_LOOPBACK_TSTI_TX_EN BIT(5) 112 #define BM_ANADIG_USB2_LOOPBACK_UTMI_DIG_TST1 BIT(2) 113 #define BM_ANADIG_USB2_LOOPBACK_TSTI_TX_EN BIT(5) 114 115 #define BM_ANADIG_USB1_MISC_RX_VPIN_FS BIT(29) 116 #define BM_ANADIG_USB1_MISC_RX_VMIN_FS BIT(28) 117 #define BM_ANADIG_USB2_MISC_RX_VPIN_FS BIT(29) 118 #define BM_ANADIG_USB2_MISC_RX_VMIN_FS BIT(28) 119 120 #define to_mxs_phy(p) container_of((p), struct mxs_phy, phy) 121 122 /* Do disconnection between PHY and controller without vbus */ 123 #define MXS_PHY_DISCONNECT_LINE_WITHOUT_VBUS BIT(0) 124 125 /* 126 * The PHY will be in messy if there is a wakeup after putting 127 * bus to suspend (set portsc.suspendM) but before setting PHY to low 128 * power mode (set portsc.phcd). 129 */ 130 #define MXS_PHY_ABNORMAL_IN_SUSPEND BIT(1) 131 132 /* 133 * The SOF sends too fast after resuming, it will cause disconnection 134 * between host and high speed device. 135 */ 136 #define MXS_PHY_SENDING_SOF_TOO_FAST BIT(2) 137 138 /* 139 * IC has bug fixes logic, they include 140 * MXS_PHY_ABNORMAL_IN_SUSPEND and MXS_PHY_SENDING_SOF_TOO_FAST 141 * which are described at above flags, the RTL will handle it 142 * according to different versions. 143 */ 144 #define MXS_PHY_NEED_IP_FIX BIT(3) 145 146 /* Minimum and maximum values for device tree entries */ 147 #define MXS_PHY_TX_CAL45_MIN 35 148 #define MXS_PHY_TX_CAL45_MAX 54 149 #define MXS_PHY_TX_D_CAL_MIN 79 150 #define MXS_PHY_TX_D_CAL_MAX 119 151 152 struct mxs_phy_data { 153 unsigned int flags; 154 }; 155 156 static const struct mxs_phy_data imx23_phy_data = { 157 .flags = MXS_PHY_ABNORMAL_IN_SUSPEND | MXS_PHY_SENDING_SOF_TOO_FAST, 158 }; 159 160 static const struct mxs_phy_data imx6q_phy_data = { 161 .flags = MXS_PHY_SENDING_SOF_TOO_FAST | 162 MXS_PHY_DISCONNECT_LINE_WITHOUT_VBUS | 163 MXS_PHY_NEED_IP_FIX, 164 }; 165 166 static const struct mxs_phy_data imx6sl_phy_data = { 167 .flags = MXS_PHY_DISCONNECT_LINE_WITHOUT_VBUS | 168 MXS_PHY_NEED_IP_FIX, 169 }; 170 171 static const struct mxs_phy_data vf610_phy_data = { 172 .flags = MXS_PHY_DISCONNECT_LINE_WITHOUT_VBUS | 173 MXS_PHY_NEED_IP_FIX, 174 }; 175 176 static const struct mxs_phy_data imx6sx_phy_data = { 177 .flags = MXS_PHY_DISCONNECT_LINE_WITHOUT_VBUS, 178 }; 179 180 static const struct mxs_phy_data imx6ul_phy_data = { 181 .flags = MXS_PHY_DISCONNECT_LINE_WITHOUT_VBUS, 182 }; 183 184 static const struct mxs_phy_data imx7ulp_phy_data = { 185 }; 186 187 static const struct of_device_id mxs_phy_dt_ids[] = { 188 { .compatible = "fsl,imx6sx-usbphy", .data = &imx6sx_phy_data, }, 189 { .compatible = "fsl,imx6sl-usbphy", .data = &imx6sl_phy_data, }, 190 { .compatible = "fsl,imx6q-usbphy", .data = &imx6q_phy_data, }, 191 { .compatible = "fsl,imx23-usbphy", .data = &imx23_phy_data, }, 192 { .compatible = "fsl,vf610-usbphy", .data = &vf610_phy_data, }, 193 { .compatible = "fsl,imx6ul-usbphy", .data = &imx6ul_phy_data, }, 194 { .compatible = "fsl,imx7ulp-usbphy", .data = &imx7ulp_phy_data, }, 195 { /* sentinel */ } 196 }; 197 MODULE_DEVICE_TABLE(of, mxs_phy_dt_ids); 198 199 struct mxs_phy { 200 struct usb_phy phy; 201 struct clk *clk; 202 const struct mxs_phy_data *data; 203 struct regmap *regmap_anatop; 204 int port_id; 205 u32 tx_reg_set; 206 u32 tx_reg_mask; 207 }; 208 209 static inline bool is_imx6q_phy(struct mxs_phy *mxs_phy) 210 { 211 return mxs_phy->data == &imx6q_phy_data; 212 } 213 214 static inline bool is_imx6sl_phy(struct mxs_phy *mxs_phy) 215 { 216 return mxs_phy->data == &imx6sl_phy_data; 217 } 218 219 static inline bool is_imx7ulp_phy(struct mxs_phy *mxs_phy) 220 { 221 return mxs_phy->data == &imx7ulp_phy_data; 222 } 223 224 /* 225 * PHY needs some 32K cycles to switch from 32K clock to 226 * bus (such as AHB/AXI, etc) clock. 227 */ 228 static void mxs_phy_clock_switch_delay(void) 229 { 230 usleep_range(300, 400); 231 } 232 233 static void mxs_phy_tx_init(struct mxs_phy *mxs_phy) 234 { 235 void __iomem *base = mxs_phy->phy.io_priv; 236 u32 phytx; 237 238 /* Update TX register if there is anything to write */ 239 if (mxs_phy->tx_reg_mask) { 240 phytx = readl(base + HW_USBPHY_TX); 241 phytx &= ~mxs_phy->tx_reg_mask; 242 phytx |= mxs_phy->tx_reg_set; 243 writel(phytx, base + HW_USBPHY_TX); 244 } 245 } 246 247 static int mxs_phy_pll_enable(void __iomem *base, bool enable) 248 { 249 int ret = 0; 250 251 if (enable) { 252 u32 value; 253 254 writel(BM_USBPHY_PLL_REG_ENABLE, base + HW_USBPHY_PLL_SIC_SET); 255 writel(BM_USBPHY_PLL_BYPASS, base + HW_USBPHY_PLL_SIC_CLR); 256 writel(BM_USBPHY_PLL_POWER, base + HW_USBPHY_PLL_SIC_SET); 257 ret = readl_poll_timeout(base + HW_USBPHY_PLL_SIC, 258 value, (value & BM_USBPHY_PLL_LOCK) != 0, 259 100, 10000); 260 if (ret) 261 return ret; 262 263 writel(BM_USBPHY_PLL_EN_USB_CLKS, base + 264 HW_USBPHY_PLL_SIC_SET); 265 } else { 266 writel(BM_USBPHY_PLL_EN_USB_CLKS, base + 267 HW_USBPHY_PLL_SIC_CLR); 268 writel(BM_USBPHY_PLL_POWER, base + HW_USBPHY_PLL_SIC_CLR); 269 writel(BM_USBPHY_PLL_BYPASS, base + HW_USBPHY_PLL_SIC_SET); 270 writel(BM_USBPHY_PLL_REG_ENABLE, base + HW_USBPHY_PLL_SIC_CLR); 271 } 272 273 return ret; 274 } 275 276 static int mxs_phy_hw_init(struct mxs_phy *mxs_phy) 277 { 278 int ret; 279 void __iomem *base = mxs_phy->phy.io_priv; 280 281 if (is_imx7ulp_phy(mxs_phy)) { 282 ret = mxs_phy_pll_enable(base, true); 283 if (ret) 284 return ret; 285 } 286 287 ret = stmp_reset_block(base + HW_USBPHY_CTRL); 288 if (ret) 289 goto disable_pll; 290 291 /* Power up the PHY */ 292 writel(0, base + HW_USBPHY_PWD); 293 294 /* 295 * USB PHY Ctrl Setting 296 * - Auto clock/power on 297 * - Enable full/low speed support 298 */ 299 writel(BM_USBPHY_CTRL_ENAUTOSET_USBCLKS | 300 BM_USBPHY_CTRL_ENAUTOCLR_USBCLKGATE | 301 BM_USBPHY_CTRL_ENAUTOCLR_PHY_PWD | 302 BM_USBPHY_CTRL_ENAUTOCLR_CLKGATE | 303 BM_USBPHY_CTRL_ENAUTO_PWRON_PLL | 304 BM_USBPHY_CTRL_ENUTMILEVEL2 | 305 BM_USBPHY_CTRL_ENUTMILEVEL3, 306 base + HW_USBPHY_CTRL_SET); 307 308 if (mxs_phy->data->flags & MXS_PHY_NEED_IP_FIX) 309 writel(BM_USBPHY_IP_FIX, base + HW_USBPHY_IP_SET); 310 311 if (mxs_phy->regmap_anatop) { 312 unsigned int reg = mxs_phy->port_id ? 313 ANADIG_USB1_CHRG_DETECT_SET : 314 ANADIG_USB2_CHRG_DETECT_SET; 315 /* 316 * The external charger detector needs to be disabled, 317 * or the signal at DP will be poor 318 */ 319 regmap_write(mxs_phy->regmap_anatop, reg, 320 ANADIG_USB1_CHRG_DETECT_EN_B | 321 ANADIG_USB1_CHRG_DETECT_CHK_CHRG_B); 322 } 323 324 mxs_phy_tx_init(mxs_phy); 325 326 return 0; 327 328 disable_pll: 329 if (is_imx7ulp_phy(mxs_phy)) 330 mxs_phy_pll_enable(base, false); 331 return ret; 332 } 333 334 /* Return true if the vbus is there */ 335 static bool mxs_phy_get_vbus_status(struct mxs_phy *mxs_phy) 336 { 337 unsigned int vbus_value = 0; 338 339 if (!mxs_phy->regmap_anatop) 340 return false; 341 342 if (mxs_phy->port_id == 0) 343 regmap_read(mxs_phy->regmap_anatop, 344 ANADIG_USB1_VBUS_DET_STAT, 345 &vbus_value); 346 else if (mxs_phy->port_id == 1) 347 regmap_read(mxs_phy->regmap_anatop, 348 ANADIG_USB2_VBUS_DET_STAT, 349 &vbus_value); 350 351 if (vbus_value & BM_ANADIG_USB1_VBUS_DET_STAT_VBUS_VALID) 352 return true; 353 else 354 return false; 355 } 356 357 static void __mxs_phy_disconnect_line(struct mxs_phy *mxs_phy, bool disconnect) 358 { 359 void __iomem *base = mxs_phy->phy.io_priv; 360 u32 reg; 361 362 if (disconnect) 363 writel_relaxed(BM_USBPHY_DEBUG_CLKGATE, 364 base + HW_USBPHY_DEBUG_CLR); 365 366 if (mxs_phy->port_id == 0) { 367 reg = disconnect ? ANADIG_USB1_LOOPBACK_SET 368 : ANADIG_USB1_LOOPBACK_CLR; 369 regmap_write(mxs_phy->regmap_anatop, reg, 370 BM_ANADIG_USB1_LOOPBACK_UTMI_DIG_TST1 | 371 BM_ANADIG_USB1_LOOPBACK_TSTI_TX_EN); 372 } else if (mxs_phy->port_id == 1) { 373 reg = disconnect ? ANADIG_USB2_LOOPBACK_SET 374 : ANADIG_USB2_LOOPBACK_CLR; 375 regmap_write(mxs_phy->regmap_anatop, reg, 376 BM_ANADIG_USB2_LOOPBACK_UTMI_DIG_TST1 | 377 BM_ANADIG_USB2_LOOPBACK_TSTI_TX_EN); 378 } 379 380 if (!disconnect) 381 writel_relaxed(BM_USBPHY_DEBUG_CLKGATE, 382 base + HW_USBPHY_DEBUG_SET); 383 384 /* Delay some time, and let Linestate be SE0 for controller */ 385 if (disconnect) 386 usleep_range(500, 1000); 387 } 388 389 static bool mxs_phy_is_otg_host(struct mxs_phy *mxs_phy) 390 { 391 void __iomem *base = mxs_phy->phy.io_priv; 392 u32 phyctrl = readl(base + HW_USBPHY_CTRL); 393 394 if (IS_ENABLED(CONFIG_USB_OTG) && 395 !(phyctrl & BM_USBPHY_CTRL_OTG_ID_VALUE)) 396 return true; 397 398 return false; 399 } 400 401 static void mxs_phy_disconnect_line(struct mxs_phy *mxs_phy, bool on) 402 { 403 bool vbus_is_on = false; 404 405 /* If the SoCs don't need to disconnect line without vbus, quit */ 406 if (!(mxs_phy->data->flags & MXS_PHY_DISCONNECT_LINE_WITHOUT_VBUS)) 407 return; 408 409 /* If the SoCs don't have anatop, quit */ 410 if (!mxs_phy->regmap_anatop) 411 return; 412 413 vbus_is_on = mxs_phy_get_vbus_status(mxs_phy); 414 415 if (on && !vbus_is_on && !mxs_phy_is_otg_host(mxs_phy)) 416 __mxs_phy_disconnect_line(mxs_phy, true); 417 else 418 __mxs_phy_disconnect_line(mxs_phy, false); 419 420 } 421 422 static int mxs_phy_init(struct usb_phy *phy) 423 { 424 int ret; 425 struct mxs_phy *mxs_phy = to_mxs_phy(phy); 426 427 mxs_phy_clock_switch_delay(); 428 ret = clk_prepare_enable(mxs_phy->clk); 429 if (ret) 430 return ret; 431 432 return mxs_phy_hw_init(mxs_phy); 433 } 434 435 static void mxs_phy_shutdown(struct usb_phy *phy) 436 { 437 struct mxs_phy *mxs_phy = to_mxs_phy(phy); 438 u32 value = BM_USBPHY_CTRL_ENVBUSCHG_WKUP | 439 BM_USBPHY_CTRL_ENDPDMCHG_WKUP | 440 BM_USBPHY_CTRL_ENIDCHG_WKUP | 441 BM_USBPHY_CTRL_ENAUTOSET_USBCLKS | 442 BM_USBPHY_CTRL_ENAUTOCLR_USBCLKGATE | 443 BM_USBPHY_CTRL_ENAUTOCLR_PHY_PWD | 444 BM_USBPHY_CTRL_ENAUTOCLR_CLKGATE | 445 BM_USBPHY_CTRL_ENAUTO_PWRON_PLL; 446 447 writel(value, phy->io_priv + HW_USBPHY_CTRL_CLR); 448 writel(0xffffffff, phy->io_priv + HW_USBPHY_PWD); 449 450 writel(BM_USBPHY_CTRL_CLKGATE, 451 phy->io_priv + HW_USBPHY_CTRL_SET); 452 453 if (is_imx7ulp_phy(mxs_phy)) 454 mxs_phy_pll_enable(phy->io_priv, false); 455 456 clk_disable_unprepare(mxs_phy->clk); 457 } 458 459 static bool mxs_phy_is_low_speed_connection(struct mxs_phy *mxs_phy) 460 { 461 unsigned int line_state; 462 /* bit definition is the same for all controllers */ 463 unsigned int dp_bit = BM_ANADIG_USB1_MISC_RX_VPIN_FS, 464 dm_bit = BM_ANADIG_USB1_MISC_RX_VMIN_FS; 465 unsigned int reg = ANADIG_USB1_MISC; 466 467 /* If the SoCs don't have anatop, quit */ 468 if (!mxs_phy->regmap_anatop) 469 return false; 470 471 if (mxs_phy->port_id == 0) 472 reg = ANADIG_USB1_MISC; 473 else if (mxs_phy->port_id == 1) 474 reg = ANADIG_USB2_MISC; 475 476 regmap_read(mxs_phy->regmap_anatop, reg, &line_state); 477 478 if ((line_state & (dp_bit | dm_bit)) == dm_bit) 479 return true; 480 else 481 return false; 482 } 483 484 static int mxs_phy_suspend(struct usb_phy *x, int suspend) 485 { 486 int ret; 487 struct mxs_phy *mxs_phy = to_mxs_phy(x); 488 bool low_speed_connection, vbus_is_on; 489 490 low_speed_connection = mxs_phy_is_low_speed_connection(mxs_phy); 491 vbus_is_on = mxs_phy_get_vbus_status(mxs_phy); 492 493 if (suspend) { 494 /* 495 * FIXME: Do not power down RXPWD1PT1 bit for low speed 496 * connect. The low speed connection will have problem at 497 * very rare cases during usb suspend and resume process. 498 */ 499 if (low_speed_connection & vbus_is_on) { 500 /* 501 * If value to be set as pwd value is not 0xffffffff, 502 * several 32Khz cycles are needed. 503 */ 504 mxs_phy_clock_switch_delay(); 505 writel(0xffbfffff, x->io_priv + HW_USBPHY_PWD); 506 } else { 507 writel(0xffffffff, x->io_priv + HW_USBPHY_PWD); 508 } 509 writel(BM_USBPHY_CTRL_CLKGATE, 510 x->io_priv + HW_USBPHY_CTRL_SET); 511 clk_disable_unprepare(mxs_phy->clk); 512 } else { 513 mxs_phy_clock_switch_delay(); 514 ret = clk_prepare_enable(mxs_phy->clk); 515 if (ret) 516 return ret; 517 writel(BM_USBPHY_CTRL_CLKGATE, 518 x->io_priv + HW_USBPHY_CTRL_CLR); 519 writel(0, x->io_priv + HW_USBPHY_PWD); 520 } 521 522 return 0; 523 } 524 525 static int mxs_phy_set_wakeup(struct usb_phy *x, bool enabled) 526 { 527 struct mxs_phy *mxs_phy = to_mxs_phy(x); 528 u32 value = BM_USBPHY_CTRL_ENVBUSCHG_WKUP | 529 BM_USBPHY_CTRL_ENDPDMCHG_WKUP | 530 BM_USBPHY_CTRL_ENIDCHG_WKUP; 531 if (enabled) { 532 mxs_phy_disconnect_line(mxs_phy, true); 533 writel_relaxed(value, x->io_priv + HW_USBPHY_CTRL_SET); 534 } else { 535 writel_relaxed(value, x->io_priv + HW_USBPHY_CTRL_CLR); 536 mxs_phy_disconnect_line(mxs_phy, false); 537 } 538 539 return 0; 540 } 541 542 static int mxs_phy_on_connect(struct usb_phy *phy, 543 enum usb_device_speed speed) 544 { 545 dev_dbg(phy->dev, "%s device has connected\n", 546 (speed == USB_SPEED_HIGH) ? "HS" : "FS/LS"); 547 548 if (speed == USB_SPEED_HIGH) 549 writel(BM_USBPHY_CTRL_ENHOSTDISCONDETECT, 550 phy->io_priv + HW_USBPHY_CTRL_SET); 551 552 return 0; 553 } 554 555 static int mxs_phy_on_disconnect(struct usb_phy *phy, 556 enum usb_device_speed speed) 557 { 558 dev_dbg(phy->dev, "%s device has disconnected\n", 559 (speed == USB_SPEED_HIGH) ? "HS" : "FS/LS"); 560 561 /* Sometimes, the speed is not high speed when the error occurs */ 562 if (readl(phy->io_priv + HW_USBPHY_CTRL) & 563 BM_USBPHY_CTRL_ENHOSTDISCONDETECT) 564 writel(BM_USBPHY_CTRL_ENHOSTDISCONDETECT, 565 phy->io_priv + HW_USBPHY_CTRL_CLR); 566 567 return 0; 568 } 569 570 #define MXS_USB_CHARGER_DATA_CONTACT_TIMEOUT 100 571 static int mxs_charger_data_contact_detect(struct mxs_phy *x) 572 { 573 struct regmap *regmap = x->regmap_anatop; 574 int i, stable_contact_count = 0; 575 u32 val; 576 577 /* Check if vbus is valid */ 578 regmap_read(regmap, ANADIG_USB1_VBUS_DET_STAT, &val); 579 if (!(val & ANADIG_USB1_VBUS_DET_STAT_VBUS_VALID)) { 580 dev_err(x->phy.dev, "vbus is not valid\n"); 581 return -EINVAL; 582 } 583 584 /* Enable charger detector */ 585 regmap_write(regmap, ANADIG_USB1_CHRG_DETECT_CLR, 586 ANADIG_USB1_CHRG_DETECT_EN_B); 587 /* 588 * - Do not check whether a charger is connected to the USB port 589 * - Check whether the USB plug has been in contact with each other 590 */ 591 regmap_write(regmap, ANADIG_USB1_CHRG_DETECT_SET, 592 ANADIG_USB1_CHRG_DETECT_CHK_CONTACT | 593 ANADIG_USB1_CHRG_DETECT_CHK_CHRG_B); 594 595 /* Check if plug is connected */ 596 for (i = 0; i < MXS_USB_CHARGER_DATA_CONTACT_TIMEOUT; i++) { 597 regmap_read(regmap, ANADIG_USB1_CHRG_DET_STAT, &val); 598 if (val & ANADIG_USB1_CHRG_DET_STAT_PLUG_CONTACT) { 599 stable_contact_count++; 600 if (stable_contact_count > 5) 601 /* Data pin makes contact */ 602 break; 603 else 604 usleep_range(5000, 10000); 605 } else { 606 stable_contact_count = 0; 607 usleep_range(5000, 6000); 608 } 609 } 610 611 if (i == MXS_USB_CHARGER_DATA_CONTACT_TIMEOUT) { 612 dev_err(x->phy.dev, 613 "Data pin can't make good contact.\n"); 614 /* Disable charger detector */ 615 regmap_write(regmap, ANADIG_USB1_CHRG_DETECT_SET, 616 ANADIG_USB1_CHRG_DETECT_EN_B | 617 ANADIG_USB1_CHRG_DETECT_CHK_CHRG_B); 618 return -ENXIO; 619 } 620 621 return 0; 622 } 623 624 static enum usb_charger_type mxs_charger_primary_detection(struct mxs_phy *x) 625 { 626 struct regmap *regmap = x->regmap_anatop; 627 enum usb_charger_type chgr_type = UNKNOWN_TYPE; 628 u32 val; 629 630 /* 631 * - Do check whether a charger is connected to the USB port 632 * - Do not Check whether the USB plug has been in contact with 633 * each other 634 */ 635 regmap_write(regmap, ANADIG_USB1_CHRG_DETECT_CLR, 636 ANADIG_USB1_CHRG_DETECT_CHK_CONTACT | 637 ANADIG_USB1_CHRG_DETECT_CHK_CHRG_B); 638 639 msleep(100); 640 641 /* Check if it is a charger */ 642 regmap_read(regmap, ANADIG_USB1_CHRG_DET_STAT, &val); 643 if (!(val & ANADIG_USB1_CHRG_DET_STAT_CHRG_DETECTED)) { 644 chgr_type = SDP_TYPE; 645 dev_dbg(x->phy.dev, "It is a standard downstream port\n"); 646 } 647 648 /* Disable charger detector */ 649 regmap_write(regmap, ANADIG_USB1_CHRG_DETECT_SET, 650 ANADIG_USB1_CHRG_DETECT_EN_B | 651 ANADIG_USB1_CHRG_DETECT_CHK_CHRG_B); 652 653 return chgr_type; 654 } 655 656 /* 657 * It must be called after DP is pulled up, which is used to 658 * differentiate DCP and CDP. 659 */ 660 static enum usb_charger_type mxs_charger_secondary_detection(struct mxs_phy *x) 661 { 662 struct regmap *regmap = x->regmap_anatop; 663 int val; 664 665 msleep(80); 666 667 regmap_read(regmap, ANADIG_USB1_CHRG_DET_STAT, &val); 668 if (val & ANADIG_USB1_CHRG_DET_STAT_DM_STATE) { 669 dev_dbg(x->phy.dev, "It is a dedicate charging port\n"); 670 return DCP_TYPE; 671 } else { 672 dev_dbg(x->phy.dev, "It is a charging downstream port\n"); 673 return CDP_TYPE; 674 } 675 } 676 677 static enum usb_charger_type mxs_phy_charger_detect(struct usb_phy *phy) 678 { 679 struct mxs_phy *mxs_phy = to_mxs_phy(phy); 680 struct regmap *regmap = mxs_phy->regmap_anatop; 681 void __iomem *base = phy->io_priv; 682 enum usb_charger_type chgr_type = UNKNOWN_TYPE; 683 684 if (!regmap) 685 return UNKNOWN_TYPE; 686 687 if (mxs_charger_data_contact_detect(mxs_phy)) 688 return chgr_type; 689 690 chgr_type = mxs_charger_primary_detection(mxs_phy); 691 692 if (chgr_type != SDP_TYPE) { 693 /* Pull up DP via test */ 694 writel_relaxed(BM_USBPHY_DEBUG_CLKGATE, 695 base + HW_USBPHY_DEBUG_CLR); 696 regmap_write(regmap, ANADIG_USB1_LOOPBACK_SET, 697 ANADIG_USB1_LOOPBACK_UTMI_TESTSTART); 698 699 chgr_type = mxs_charger_secondary_detection(mxs_phy); 700 701 /* Stop the test */ 702 regmap_write(regmap, ANADIG_USB1_LOOPBACK_CLR, 703 ANADIG_USB1_LOOPBACK_UTMI_TESTSTART); 704 writel_relaxed(BM_USBPHY_DEBUG_CLKGATE, 705 base + HW_USBPHY_DEBUG_SET); 706 } 707 708 return chgr_type; 709 } 710 711 static int mxs_phy_probe(struct platform_device *pdev) 712 { 713 void __iomem *base; 714 struct clk *clk; 715 struct mxs_phy *mxs_phy; 716 int ret; 717 struct device_node *np = pdev->dev.of_node; 718 u32 val; 719 720 base = devm_platform_ioremap_resource(pdev, 0); 721 if (IS_ERR(base)) 722 return PTR_ERR(base); 723 724 clk = devm_clk_get(&pdev->dev, NULL); 725 if (IS_ERR(clk)) { 726 dev_err(&pdev->dev, 727 "can't get the clock, err=%ld", PTR_ERR(clk)); 728 return PTR_ERR(clk); 729 } 730 731 mxs_phy = devm_kzalloc(&pdev->dev, sizeof(*mxs_phy), GFP_KERNEL); 732 if (!mxs_phy) 733 return -ENOMEM; 734 735 /* Some SoCs don't have anatop registers */ 736 if (of_property_present(np, "fsl,anatop")) { 737 mxs_phy->regmap_anatop = syscon_regmap_lookup_by_phandle 738 (np, "fsl,anatop"); 739 if (IS_ERR(mxs_phy->regmap_anatop)) { 740 dev_dbg(&pdev->dev, 741 "failed to find regmap for anatop\n"); 742 return PTR_ERR(mxs_phy->regmap_anatop); 743 } 744 } 745 746 /* Precompute which bits of the TX register are to be updated, if any */ 747 if (!of_property_read_u32(np, "fsl,tx-cal-45-dn-ohms", &val) && 748 val >= MXS_PHY_TX_CAL45_MIN && val <= MXS_PHY_TX_CAL45_MAX) { 749 /* Scale to a 4-bit value */ 750 val = (MXS_PHY_TX_CAL45_MAX - val) * 0xF 751 / (MXS_PHY_TX_CAL45_MAX - MXS_PHY_TX_CAL45_MIN); 752 mxs_phy->tx_reg_mask |= GM_USBPHY_TX_TXCAL45DN(~0); 753 mxs_phy->tx_reg_set |= GM_USBPHY_TX_TXCAL45DN(val); 754 } 755 756 if (!of_property_read_u32(np, "fsl,tx-cal-45-dp-ohms", &val) && 757 val >= MXS_PHY_TX_CAL45_MIN && val <= MXS_PHY_TX_CAL45_MAX) { 758 /* Scale to a 4-bit value. */ 759 val = (MXS_PHY_TX_CAL45_MAX - val) * 0xF 760 / (MXS_PHY_TX_CAL45_MAX - MXS_PHY_TX_CAL45_MIN); 761 mxs_phy->tx_reg_mask |= GM_USBPHY_TX_TXCAL45DP(~0); 762 mxs_phy->tx_reg_set |= GM_USBPHY_TX_TXCAL45DP(val); 763 } 764 765 if (!of_property_read_u32(np, "fsl,tx-d-cal", &val) && 766 val >= MXS_PHY_TX_D_CAL_MIN && val <= MXS_PHY_TX_D_CAL_MAX) { 767 /* Scale to a 4-bit value. Round up the values and heavily 768 * weight the rounding by adding 2/3 of the denominator. 769 */ 770 val = ((MXS_PHY_TX_D_CAL_MAX - val) * 0xF 771 + (MXS_PHY_TX_D_CAL_MAX - MXS_PHY_TX_D_CAL_MIN) * 2/3) 772 / (MXS_PHY_TX_D_CAL_MAX - MXS_PHY_TX_D_CAL_MIN); 773 mxs_phy->tx_reg_mask |= GM_USBPHY_TX_D_CAL(~0); 774 mxs_phy->tx_reg_set |= GM_USBPHY_TX_D_CAL(val); 775 } 776 777 ret = of_alias_get_id(np, "usbphy"); 778 if (ret < 0) 779 dev_dbg(&pdev->dev, "failed to get alias id, errno %d\n", ret); 780 mxs_phy->port_id = ret; 781 782 mxs_phy->phy.io_priv = base; 783 mxs_phy->phy.dev = &pdev->dev; 784 mxs_phy->phy.label = DRIVER_NAME; 785 mxs_phy->phy.init = mxs_phy_init; 786 mxs_phy->phy.shutdown = mxs_phy_shutdown; 787 mxs_phy->phy.set_suspend = mxs_phy_suspend; 788 mxs_phy->phy.notify_connect = mxs_phy_on_connect; 789 mxs_phy->phy.notify_disconnect = mxs_phy_on_disconnect; 790 mxs_phy->phy.type = USB_PHY_TYPE_USB2; 791 mxs_phy->phy.set_wakeup = mxs_phy_set_wakeup; 792 mxs_phy->phy.charger_detect = mxs_phy_charger_detect; 793 794 mxs_phy->clk = clk; 795 mxs_phy->data = of_device_get_match_data(&pdev->dev); 796 797 platform_set_drvdata(pdev, mxs_phy); 798 799 device_set_wakeup_capable(&pdev->dev, true); 800 801 return usb_add_phy_dev(&mxs_phy->phy); 802 } 803 804 static void mxs_phy_remove(struct platform_device *pdev) 805 { 806 struct mxs_phy *mxs_phy = platform_get_drvdata(pdev); 807 808 usb_remove_phy(&mxs_phy->phy); 809 } 810 811 #ifdef CONFIG_PM_SLEEP 812 static void mxs_phy_enable_ldo_in_suspend(struct mxs_phy *mxs_phy, bool on) 813 { 814 unsigned int reg = on ? ANADIG_ANA_MISC0_SET : ANADIG_ANA_MISC0_CLR; 815 816 /* If the SoCs don't have anatop, quit */ 817 if (!mxs_phy->regmap_anatop) 818 return; 819 820 if (is_imx6q_phy(mxs_phy)) 821 regmap_write(mxs_phy->regmap_anatop, reg, 822 BM_ANADIG_ANA_MISC0_STOP_MODE_CONFIG); 823 else if (is_imx6sl_phy(mxs_phy)) 824 regmap_write(mxs_phy->regmap_anatop, 825 reg, BM_ANADIG_ANA_MISC0_STOP_MODE_CONFIG_SL); 826 } 827 828 static int mxs_phy_system_suspend(struct device *dev) 829 { 830 struct mxs_phy *mxs_phy = dev_get_drvdata(dev); 831 832 if (device_may_wakeup(dev)) 833 mxs_phy_enable_ldo_in_suspend(mxs_phy, true); 834 835 return 0; 836 } 837 838 static int mxs_phy_system_resume(struct device *dev) 839 { 840 struct mxs_phy *mxs_phy = dev_get_drvdata(dev); 841 842 if (device_may_wakeup(dev)) 843 mxs_phy_enable_ldo_in_suspend(mxs_phy, false); 844 845 return 0; 846 } 847 #endif /* CONFIG_PM_SLEEP */ 848 849 static SIMPLE_DEV_PM_OPS(mxs_phy_pm, mxs_phy_system_suspend, 850 mxs_phy_system_resume); 851 852 static struct platform_driver mxs_phy_driver = { 853 .probe = mxs_phy_probe, 854 .remove_new = mxs_phy_remove, 855 .driver = { 856 .name = DRIVER_NAME, 857 .of_match_table = mxs_phy_dt_ids, 858 .pm = &mxs_phy_pm, 859 }, 860 }; 861 862 static int __init mxs_phy_module_init(void) 863 { 864 return platform_driver_register(&mxs_phy_driver); 865 } 866 postcore_initcall(mxs_phy_module_init); 867 868 static void __exit mxs_phy_module_exit(void) 869 { 870 platform_driver_unregister(&mxs_phy_driver); 871 } 872 module_exit(mxs_phy_module_exit); 873 874 MODULE_ALIAS("platform:mxs-usb-phy"); 875 MODULE_AUTHOR("Marek Vasut <marex@denx.de>"); 876 MODULE_AUTHOR("Richard Zhao <richard.zhao@freescale.com>"); 877 MODULE_DESCRIPTION("Freescale MXS USB PHY driver"); 878 MODULE_LICENSE("GPL"); 879