drivers/phy/st/phy-stm32-usbphyc.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * STMicroelectronics STM32 USB PHY Controller driver
   4  *
   5  * Copyright (C) 2018 STMicroelectronics
   6  * Author(s): Amelie Delaunay <amelie.delaunay@st.com>.
   7  */
   8 #include <linux/bitfield.h>
   9 #include <linux/clk.h>
  10 #include <linux/clk-provider.h>
  11 #include <linux/delay.h>
  12 #include <linux/iopoll.h>
  13 #include <linux/kernel.h>
  14 #include <linux/module.h>
  15 #include <linux/of.h>
  16 #include <linux/phy/phy.h>
  17 #include <linux/platform_device.h>
  18 #include <linux/reset.h>
  19 #include <linux/units.h>
  20
  21 #define STM32_USBPHYC_PLL       0x0
  22 #define STM32_USBPHYC_MISC      0x8
  23 #define STM32_USBPHYC_MONITOR(X) (0x108 + ((X) * 0x100))
  24 #define STM32_USBPHYC_TUNE(X)   (0x10C + ((X) * 0x100))
  25 #define STM32_USBPHYC_VERSION   0x3F4
  26
  27 /* STM32_USBPHYC_PLL bit fields */
  28 #define PLLNDIV                 GENMASK(6, 0)
  29 #define PLLFRACIN               GENMASK(25, 10)
  30 #define PLLEN                   BIT(26)
  31 #define PLLSTRB                 BIT(27)
  32 #define PLLSTRBYP               BIT(28)
  33 #define PLLFRACCTL              BIT(29)
  34 #define PLLDITHEN0              BIT(30)
  35 #define PLLDITHEN1              BIT(31)
  36
  37 /* STM32_USBPHYC_MISC bit fields */
  38 #define SWITHOST                BIT(0)
  39
  40 /* STM32_USBPHYC_MONITOR bit fields */
  41 #define STM32_USBPHYC_MON_OUT   GENMASK(3, 0)
  42 #define STM32_USBPHYC_MON_SEL   GENMASK(8, 4)
  43 #define STM32_USBPHYC_MON_SEL_LOCKP 0x1F
  44 #define STM32_USBPHYC_MON_OUT_LOCKP BIT(3)
  45
  46 /* STM32_USBPHYC_TUNE bit fields */
  47 #define INCURREN                BIT(0)
  48 #define INCURRINT               BIT(1)
  49 #define LFSCAPEN                BIT(2)
  50 #define HSDRVSLEW               BIT(3)
  51 #define HSDRVDCCUR              BIT(4)
  52 #define HSDRVDCLEV              BIT(5)
  53 #define HSDRVCURINCR            BIT(6)
  54 #define FSDRVRFADJ              BIT(7)
  55 #define HSDRVRFRED              BIT(8)
  56 #define HSDRVCHKITRM            GENMASK(12, 9)
  57 #define HSDRVCHKZTRM            GENMASK(14, 13)
  58 #define OTPCOMP                 GENMASK(19, 15)
  59 #define SQLCHCTL                GENMASK(21, 20)
  60 #define HDRXGNEQEN              BIT(22)
  61 #define HSRXOFF                 GENMASK(24, 23)
  62 #define HSFALLPREEM             BIT(25)
  63 #define SHTCCTCTLPROT           BIT(26)
  64 #define STAGSEL                 BIT(27)
  65
  66 enum boosting_vals {
  67         BOOST_1000_UA = 1000,
  68         BOOST_2000_UA = 2000,
  69 };
  70
  71 enum dc_level_vals {
  72         DC_NOMINAL,
  73         DC_PLUS_5_TO_7_MV,
  74         DC_PLUS_10_TO_14_MV,
  75         DC_MINUS_5_TO_7_MV,
  76         DC_MAX,
  77 };
  78
  79 enum current_trim {
  80         CUR_NOMINAL,
  81         CUR_PLUS_1_56_PCT,
  82         CUR_PLUS_3_12_PCT,
  83         CUR_PLUS_4_68_PCT,
  84         CUR_PLUS_6_24_PCT,
  85         CUR_PLUS_7_8_PCT,
  86         CUR_PLUS_9_36_PCT,
  87         CUR_PLUS_10_92_PCT,
  88         CUR_PLUS_12_48_PCT,
  89         CUR_PLUS_14_04_PCT,
  90         CUR_PLUS_15_6_PCT,
  91         CUR_PLUS_17_16_PCT,
  92         CUR_PLUS_19_01_PCT,
  93         CUR_PLUS_20_58_PCT,
  94         CUR_PLUS_22_16_PCT,
  95         CUR_PLUS_23_73_PCT,
  96         CUR_MAX,
  97 };
  98
  99 enum impedance_trim {
 100         IMP_NOMINAL,
 101         IMP_MINUS_2_OHMS,
 102         IMP_MINUS_4_OMHS,
 103         IMP_MINUS_6_OHMS,
 104         IMP_MAX,
 105 };
 106
 107 enum squelch_level {
 108         SQLCH_NOMINAL,
 109         SQLCH_PLUS_7_MV,
 110         SQLCH_MINUS_5_MV,
 111         SQLCH_PLUS_14_MV,
 112         SQLCH_MAX,
 113 };
 114
 115 enum rx_offset {
 116         NO_RX_OFFSET,
 117         RX_OFFSET_PLUS_5_MV,
 118         RX_OFFSET_PLUS_10_MV,
 119         RX_OFFSET_MINUS_5_MV,
 120         RX_OFFSET_MAX,
 121 };
 122
 123 /* STM32_USBPHYC_VERSION bit fields */
 124 #define MINREV                  GENMASK(3, 0)
 125 #define MAJREV                  GENMASK(7, 4)
 126
 127 #define PLL_FVCO_MHZ            2880
 128 #define PLL_INFF_MIN_RATE_HZ    19200000
 129 #define PLL_INFF_MAX_RATE_HZ    38400000
 130
 131 struct pll_params {
 132         u8 ndiv;
 133         u16 frac;
 134 };
 135
 136 struct stm32_usbphyc_phy {
 137         struct phy *phy;
 138         struct stm32_usbphyc *usbphyc;
 139         struct regulator *vbus;
 140         u32 index;
 141         bool active;
 142         u32 tune;
 143 };
 144
 145 struct stm32_usbphyc {
 146         struct device *dev;
 147         void __iomem *base;
 148         struct clk *clk;
 149         struct reset_control *rst;
 150         struct stm32_usbphyc_phy **phys;
 151         int nphys;
 152         struct regulator *vdda1v1;
 153         struct regulator *vdda1v8;
 154         atomic_t n_pll_cons;
 155         struct clk_hw clk48_hw;
 156         int switch_setup;
 157 };
 158
 159 static inline void stm32_usbphyc_set_bits(void __iomem *reg, u32 bits)
 160 {
 161         writel_relaxed(readl_relaxed(reg) | bits, reg);
 162 }
 163
 164 static inline void stm32_usbphyc_clr_bits(void __iomem *reg, u32 bits)
 165 {
 166         writel_relaxed(readl_relaxed(reg) & ~bits, reg);
 167 }
 168
 169 static int stm32_usbphyc_regulators_enable(struct stm32_usbphyc *usbphyc)
 170 {
 171         int ret;
 172
 173         ret = regulator_enable(usbphyc->vdda1v1);
 174         if (ret)
 175                 return ret;
 176
 177         ret = regulator_enable(usbphyc->vdda1v8);
 178         if (ret)
 179                 goto vdda1v1_disable;
 180
 181         return 0;
 182
 183 vdda1v1_disable:
 184         regulator_disable(usbphyc->vdda1v1);
 185
 186         return ret;
 187 }
 188
 189 static int stm32_usbphyc_regulators_disable(struct stm32_usbphyc *usbphyc)
 190 {
 191         int ret;
 192
 193         ret = regulator_disable(usbphyc->vdda1v8);
 194         if (ret)
 195                 return ret;
 196
 197         ret = regulator_disable(usbphyc->vdda1v1);
 198         if (ret)
 199                 return ret;
 200
 201         return 0;
 202 }
 203
 204 static void stm32_usbphyc_get_pll_params(u32 clk_rate,
 205                                          struct pll_params *pll_params)
 206 {
 207         unsigned long long fvco, ndiv, frac;
 208
 209         /*    _
 210          *   | FVCO = INFF*2*(NDIV + FRACT/2^16) when DITHER_DISABLE[1] = 1
 211          *   | FVCO = 2880MHz
 212          *  <
 213          *   | NDIV = integer part of input bits to set the LDF
 214          *   |_FRACT = fractional part of input bits to set the LDF
 215          *  =>  PLLNDIV = integer part of (FVCO / (INFF*2))
 216          *  =>  PLLFRACIN = fractional part of(FVCO / INFF*2) * 2^16
 217          * <=>  PLLFRACIN = ((FVCO / (INFF*2)) - PLLNDIV) * 2^16
 218          */
 219         fvco = (unsigned long long)PLL_FVCO_MHZ * HZ_PER_MHZ;
 220
 221         ndiv = fvco;
 222         do_div(ndiv, (clk_rate * 2));
 223         pll_params->ndiv = (u8)ndiv;
 224
 225         frac = fvco * (1 << 16);
 226         do_div(frac, (clk_rate * 2));
 227         frac = frac - (ndiv * (1 << 16));
 228         pll_params->frac = (u16)frac;
 229 }
 230
 231 static int stm32_usbphyc_pll_init(struct stm32_usbphyc *usbphyc)
 232 {
 233         struct pll_params pll_params;
 234         u32 clk_rate = clk_get_rate(usbphyc->clk);
 235         u32 ndiv, frac;
 236         u32 usbphyc_pll;
 237
 238         if ((clk_rate < PLL_INFF_MIN_RATE_HZ) ||
 239             (clk_rate > PLL_INFF_MAX_RATE_HZ)) {
 240                 dev_err(usbphyc->dev, "input clk freq (%dHz) out of range\n",
 241                         clk_rate);
 242                 return -EINVAL;
 243         }
 244
 245         stm32_usbphyc_get_pll_params(clk_rate, &pll_params);
 246         ndiv = FIELD_PREP(PLLNDIV, pll_params.ndiv);
 247         frac = FIELD_PREP(PLLFRACIN, pll_params.frac);
 248
 249         usbphyc_pll = PLLDITHEN1 | PLLDITHEN0 | PLLSTRBYP | ndiv;
 250
 251         if (pll_params.frac)
 252                 usbphyc_pll |= PLLFRACCTL | frac;
 253
 254         writel_relaxed(usbphyc_pll, usbphyc->base + STM32_USBPHYC_PLL);
 255
 256         dev_dbg(usbphyc->dev, "input clk freq=%dHz, ndiv=%lu, frac=%lu\n",
 257                 clk_rate, FIELD_GET(PLLNDIV, usbphyc_pll),
 258                 FIELD_GET(PLLFRACIN, usbphyc_pll));
 259
 260         return 0;
 261 }
 262
 263 static int __stm32_usbphyc_pll_disable(struct stm32_usbphyc *usbphyc)
 264 {
 265         void __iomem *pll_reg = usbphyc->base + STM32_USBPHYC_PLL;
 266         u32 pllen;
 267
 268         stm32_usbphyc_clr_bits(pll_reg, PLLEN);
 269
 270         /* Wait for minimum width of powerdown pulse (ENABLE = Low) */
 271         if (readl_relaxed_poll_timeout(pll_reg, pllen, !(pllen & PLLEN), 5, 50))
 272                 dev_err(usbphyc->dev, "PLL not reset\n");
 273
 274         return stm32_usbphyc_regulators_disable(usbphyc);
 275 }
 276
 277 static int stm32_usbphyc_pll_disable(struct stm32_usbphyc *usbphyc)
 278 {
 279         /* Check if a phy port is still active or clk48 in use */
 280         if (atomic_dec_return(&usbphyc->n_pll_cons) > 0)
 281                 return 0;
 282
 283         return __stm32_usbphyc_pll_disable(usbphyc);
 284 }
 285
 286 static int stm32_usbphyc_pll_enable(struct stm32_usbphyc *usbphyc)
 287 {
 288         void __iomem *pll_reg = usbphyc->base + STM32_USBPHYC_PLL;
 289         bool pllen = readl_relaxed(pll_reg) & PLLEN;
 290         int ret;
 291
 292         /*
 293          * Check if a phy port or clk48 prepare has configured the pll
 294          * and ensure the PLL is enabled
 295          */
 296         if (atomic_inc_return(&usbphyc->n_pll_cons) > 1 && pllen)
 297                 return 0;
 298
 299         if (pllen) {
 300                 /*
 301                  * PLL shouldn't be enabled without known consumer,
 302                  * disable it and reinit n_pll_cons
 303                  */
 304                 dev_warn(usbphyc->dev, "PLL enabled without known consumers\n");
 305
 306                 ret = __stm32_usbphyc_pll_disable(usbphyc);
 307                 if (ret)
 308                         goto dec_n_pll_cons;
 309         }
 310
 311         ret = stm32_usbphyc_regulators_enable(usbphyc);
 312         if (ret)
 313                 goto dec_n_pll_cons;
 314
 315         ret = stm32_usbphyc_pll_init(usbphyc);
 316         if (ret)
 317                 goto reg_disable;
 318
 319         stm32_usbphyc_set_bits(pll_reg, PLLEN);
 320
 321         /* Wait for maximum lock time */
 322         usleep_range(200, 300);
 323
 324         return 0;
 325
 326 reg_disable:
 327         stm32_usbphyc_regulators_disable(usbphyc);
 328
 329 dec_n_pll_cons:
 330         atomic_dec(&usbphyc->n_pll_cons);
 331
 332         return ret;
 333 }
 334
 335 static int stm32_usbphyc_phy_init(struct phy *phy)
 336 {
 337         struct stm32_usbphyc_phy *usbphyc_phy = phy_get_drvdata(phy);
 338         struct stm32_usbphyc *usbphyc = usbphyc_phy->usbphyc;
 339         u32 reg_mon = STM32_USBPHYC_MONITOR(usbphyc_phy->index);
 340         u32 monsel = FIELD_PREP(STM32_USBPHYC_MON_SEL,
 341                                 STM32_USBPHYC_MON_SEL_LOCKP);
 342         u32 monout;
 343         int ret;
 344
 345         ret = stm32_usbphyc_pll_enable(usbphyc);
 346         if (ret)
 347                 return ret;
 348
 349         /* Check that PLL Lock input to PHY is High */
 350         writel_relaxed(monsel, usbphyc->base + reg_mon);
 351         ret = readl_relaxed_poll_timeout(usbphyc->base + reg_mon, monout,
 352                                          (monout & STM32_USBPHYC_MON_OUT_LOCKP),
 353                                          100, 1000);
 354         if (ret) {
 355                 dev_err(usbphyc->dev, "PLL Lock input to PHY is Low (val=%x)\n",
 356                         (u32)(monout & STM32_USBPHYC_MON_OUT));
 357                 goto pll_disable;
 358         }
 359
 360         usbphyc_phy->active = true;
 361
 362         return 0;
 363
 364 pll_disable:
 365         stm32_usbphyc_pll_disable(usbphyc);
 366
 367         return ret;
 368 }
 369
 370 static int stm32_usbphyc_phy_exit(struct phy *phy)
 371 {
 372         struct stm32_usbphyc_phy *usbphyc_phy = phy_get_drvdata(phy);
 373         struct stm32_usbphyc *usbphyc = usbphyc_phy->usbphyc;
 374
 375         usbphyc_phy->active = false;
 376
 377         return stm32_usbphyc_pll_disable(usbphyc);
 378 }
 379
 380 static int stm32_usbphyc_phy_power_on(struct phy *phy)
 381 {
 382         struct stm32_usbphyc_phy *usbphyc_phy = phy_get_drvdata(phy);
 383
 384         if (usbphyc_phy->vbus)
 385                 return regulator_enable(usbphyc_phy->vbus);
 386
 387         return 0;
 388 }
 389
 390 static int stm32_usbphyc_phy_power_off(struct phy *phy)
 391 {
 392         struct stm32_usbphyc_phy *usbphyc_phy = phy_get_drvdata(phy);
 393
 394         if (usbphyc_phy->vbus)
 395                 return regulator_disable(usbphyc_phy->vbus);
 396
 397         return 0;
 398 }
 399
 400 static const struct phy_ops stm32_usbphyc_phy_ops = {
 401         .init = stm32_usbphyc_phy_init,
 402         .exit = stm32_usbphyc_phy_exit,
 403         .power_on = stm32_usbphyc_phy_power_on,
 404         .power_off = stm32_usbphyc_phy_power_off,
 405         .owner = THIS_MODULE,
 406 };
 407
 408 static int stm32_usbphyc_clk48_prepare(struct clk_hw *hw)
 409 {
 410         struct stm32_usbphyc *usbphyc = container_of(hw, struct stm32_usbphyc, clk48_hw);
 411
 412         return stm32_usbphyc_pll_enable(usbphyc);
 413 }
 414
 415 static void stm32_usbphyc_clk48_unprepare(struct clk_hw *hw)
 416 {
 417         struct stm32_usbphyc *usbphyc = container_of(hw, struct stm32_usbphyc, clk48_hw);
 418
 419         stm32_usbphyc_pll_disable(usbphyc);
 420 }
 421
 422 static unsigned long stm32_usbphyc_clk48_recalc_rate(struct clk_hw *hw, unsigned long parent_rate)
 423 {
 424         return 48000000;
 425 }
 426
 427 static const struct clk_ops usbphyc_clk48_ops = {
 428         .prepare = stm32_usbphyc_clk48_prepare,
 429         .unprepare = stm32_usbphyc_clk48_unprepare,
 430         .recalc_rate = stm32_usbphyc_clk48_recalc_rate,
 431 };
 432
 433 static void stm32_usbphyc_clk48_unregister(void *data)
 434 {
 435         struct stm32_usbphyc *usbphyc = data;
 436
 437         of_clk_del_provider(usbphyc->dev->of_node);
 438         clk_hw_unregister(&usbphyc->clk48_hw);
 439 }
 440
 441 static int stm32_usbphyc_clk48_register(struct stm32_usbphyc *usbphyc)
 442 {
 443         struct device_node *node = usbphyc->dev->of_node;
 444         struct clk_init_data init = { };
 445         int ret = 0;
 446
 447         init.name = "ck_usbo_48m";
 448         init.ops = &usbphyc_clk48_ops;
 449
 450         usbphyc->clk48_hw.init = &init;
 451
 452         ret = clk_hw_register(usbphyc->dev, &usbphyc->clk48_hw);
 453         if (ret)
 454                 return ret;
 455
 456         ret = of_clk_add_hw_provider(node, of_clk_hw_simple_get, &usbphyc->clk48_hw);
 457         if (ret)
 458                 clk_hw_unregister(&usbphyc->clk48_hw);
 459
 460         return ret;
 461 }
 462
 463 static void stm32_usbphyc_phy_tuning(struct stm32_usbphyc *usbphyc,
 464                                      struct device_node *np, u32 index)
 465 {
 466         struct stm32_usbphyc_phy *usbphyc_phy = usbphyc->phys[index];
 467         u32 reg = STM32_USBPHYC_TUNE(index);
 468         u32 otpcomp, val;
 469         int ret;
 470
 471         /* Backup OTP compensation code */
 472         otpcomp = FIELD_GET(OTPCOMP, readl_relaxed(usbphyc->base + reg));
 473
 474         ret = of_property_read_u32(np, "st,current-boost-microamp", &val);
 475         if (ret != -EINVAL) {
 476                 if (!ret && (val == BOOST_1000_UA || val == BOOST_2000_UA)) {
 477                         val = (val == BOOST_2000_UA) ? 1 : 0;
 478                         usbphyc_phy->tune |= INCURREN | FIELD_PREP(INCURRINT, val);
 479                 } else {
 480                         dev_warn(usbphyc->dev, "phy%d: invalid st,current-boost-microamp\n", index);
 481                 }
 482         }
 483
 484         if (!of_property_read_bool(np, "st,no-lsfs-fb-cap"))
 485                 usbphyc_phy->tune |= LFSCAPEN;
 486
 487         if (of_property_read_bool(np, "st,decrease-hs-slew-rate"))
 488                 usbphyc_phy->tune |= HSDRVSLEW;
 489
 490         ret = of_property_read_u32(np, "st,tune-hs-dc-level", &val);
 491         if (ret != -EINVAL) {
 492                 if (!ret && val < DC_MAX) {
 493                         if (val == DC_MINUS_5_TO_7_MV) {/* Decreases HS driver DC level */
 494                                 usbphyc_phy->tune |= HSDRVDCCUR;
 495                         } else if (val > 0) {           /* Increases HS driver DC level */
 496                                 val = (val == DC_PLUS_10_TO_14_MV) ? 1 : 0;
 497                                 usbphyc_phy->tune |= HSDRVCURINCR | FIELD_PREP(HSDRVDCLEV, val);
 498                         }
 499                 } else {
 500                         dev_warn(usbphyc->dev, "phy%d: invalid st,tune-hs-dc-level\n", index);
 501                 }
 502         }
 503
 504         if (of_property_read_bool(np, "st,enable-fs-rftime-tuning"))
 505                 usbphyc_phy->tune |= FSDRVRFADJ;
 506
 507         if (of_property_read_bool(np, "st,enable-hs-rftime-reduction"))
 508                 usbphyc_phy->tune |= HSDRVRFRED;
 509
 510         ret = of_property_read_u32(np, "st,trim-hs-current", &val);
 511         if (ret != -EINVAL) {
 512                 if (!ret && val < CUR_MAX)
 513                         usbphyc_phy->tune |= FIELD_PREP(HSDRVCHKITRM, val);
 514                 else
 515                         dev_warn(usbphyc->dev, "phy%d: invalid st,trim-hs-current\n", index);
 516         }
 517
 518         ret = of_property_read_u32(np, "st,trim-hs-impedance", &val);
 519         if (ret != -EINVAL) {
 520                 if (!ret && val < IMP_MAX)
 521                         usbphyc_phy->tune |= FIELD_PREP(HSDRVCHKZTRM, val);
 522                 else
 523                         dev_warn(usbphyc->dev, "phy%d: invalid st,trim-hs-impedance\n", index);
 524         }
 525
 526         ret = of_property_read_u32(np, "st,tune-squelch-level", &val);
 527         if (ret != -EINVAL) {
 528                 if (!ret && val < SQLCH_MAX)
 529                         usbphyc_phy->tune |= FIELD_PREP(SQLCHCTL, val);
 530                 else
 531                         dev_warn(usbphyc->dev, "phy%d: invalid st,tune-squelch\n", index);
 532         }
 533
 534         if (of_property_read_bool(np, "st,enable-hs-rx-gain-eq"))
 535                 usbphyc_phy->tune |= HDRXGNEQEN;
 536
 537         ret = of_property_read_u32(np, "st,tune-hs-rx-offset", &val);
 538         if (ret != -EINVAL) {
 539                 if (!ret && val < RX_OFFSET_MAX)
 540                         usbphyc_phy->tune |= FIELD_PREP(HSRXOFF, val);
 541                 else
 542                         dev_warn(usbphyc->dev, "phy%d: invalid st,tune-hs-rx-offset\n", index);
 543         }
 544
 545         if (of_property_read_bool(np, "st,no-hs-ftime-ctrl"))
 546                 usbphyc_phy->tune |= HSFALLPREEM;
 547
 548         if (!of_property_read_bool(np, "st,no-lsfs-sc"))
 549                 usbphyc_phy->tune |= SHTCCTCTLPROT;
 550
 551         if (of_property_read_bool(np, "st,enable-hs-tx-staggering"))
 552                 usbphyc_phy->tune |= STAGSEL;
 553
 554         /* Restore OTP compensation code */
 555         usbphyc_phy->tune |= FIELD_PREP(OTPCOMP, otpcomp);
 556
 557         /*
 558          * By default, if no st,xxx tuning property is used, usbphyc_phy->tune is equal to
 559          * STM32_USBPHYC_TUNE reset value (LFSCAPEN | SHTCCTCTLPROT | OTPCOMP).
 560          */
 561         writel_relaxed(usbphyc_phy->tune, usbphyc->base + reg);
 562 }
 563
 564 static void stm32_usbphyc_switch_setup(struct stm32_usbphyc *usbphyc,
 565                                        u32 utmi_switch)
 566 {
 567         if (!utmi_switch)
 568                 stm32_usbphyc_clr_bits(usbphyc->base + STM32_USBPHYC_MISC,
 569                                        SWITHOST);
 570         else
 571                 stm32_usbphyc_set_bits(usbphyc->base + STM32_USBPHYC_MISC,
 572                                        SWITHOST);
 573         usbphyc->switch_setup = utmi_switch;
 574 }
 575
 576 static struct phy *stm32_usbphyc_of_xlate(struct device *dev,
 577                                           struct of_phandle_args *args)
 578 {
 579         struct stm32_usbphyc *usbphyc = dev_get_drvdata(dev);
 580         struct stm32_usbphyc_phy *usbphyc_phy = NULL;
 581         struct device_node *phynode = args->np;
 582         int port = 0;
 583
 584         for (port = 0; port < usbphyc->nphys; port++) {
 585                 if (phynode == usbphyc->phys[port]->phy->dev.of_node) {
 586                         usbphyc_phy = usbphyc->phys[port];
 587                         break;
 588                 }
 589         }
 590         if (!usbphyc_phy) {
 591                 dev_err(dev, "failed to find phy\n");
 592                 return ERR_PTR(-EINVAL);
 593         }
 594
 595         if (((usbphyc_phy->index == 0) && (args->args_count != 0)) ||
 596             ((usbphyc_phy->index == 1) && (args->args_count != 1))) {
 597                 dev_err(dev, "invalid number of cells for phy port%d\n",
 598                         usbphyc_phy->index);
 599                 return ERR_PTR(-EINVAL);
 600         }
 601
 602         /* Configure the UTMI switch for PHY port#2 */
 603         if (usbphyc_phy->index == 1) {
 604                 if (usbphyc->switch_setup < 0) {
 605                         stm32_usbphyc_switch_setup(usbphyc, args->args[0]);
 606                 } else {
 607                         if (args->args[0] != usbphyc->switch_setup) {
 608                                 dev_err(dev, "phy port1 already used\n");
 609                                 return ERR_PTR(-EBUSY);
 610                         }
 611                 }
 612         }
 613
 614         return usbphyc_phy->phy;
 615 }
 616
 617 static int stm32_usbphyc_probe(struct platform_device *pdev)
 618 {
 619         struct stm32_usbphyc *usbphyc;
 620         struct device *dev = &pdev->dev;
 621         struct device_node *child, *np = dev->of_node;
 622         struct phy_provider *phy_provider;
 623         u32 pllen, version;
 624         int ret, port = 0;
 625
 626         usbphyc = devm_kzalloc(dev, sizeof(*usbphyc), GFP_KERNEL);
 627         if (!usbphyc)
 628                 return -ENOMEM;
 629         usbphyc->dev = dev;
 630         dev_set_drvdata(dev, usbphyc);
 631
 632         usbphyc->base = devm_platform_ioremap_resource(pdev, 0);
 633         if (IS_ERR(usbphyc->base))
 634                 return PTR_ERR(usbphyc->base);
 635
 636         usbphyc->clk = devm_clk_get(dev, NULL);
 637         if (IS_ERR(usbphyc->clk))
 638                 return dev_err_probe(dev, PTR_ERR(usbphyc->clk), "clk get_failed\n");
 639
 640         ret = clk_prepare_enable(usbphyc->clk);
 641         if (ret) {
 642                 dev_err(dev, "clk enable failed: %d\n", ret);
 643                 return ret;
 644         }
 645
 646         usbphyc->rst = devm_reset_control_get(dev, NULL);
 647         if (!IS_ERR(usbphyc->rst)) {
 648                 reset_control_assert(usbphyc->rst);
 649                 udelay(2);
 650                 reset_control_deassert(usbphyc->rst);
 651         } else {
 652                 ret = PTR_ERR(usbphyc->rst);
 653                 if (ret == -EPROBE_DEFER)
 654                         goto clk_disable;
 655
 656                 stm32_usbphyc_clr_bits(usbphyc->base + STM32_USBPHYC_PLL, PLLEN);
 657         }
 658
 659         /*
 660          * Wait for minimum width of powerdown pulse (ENABLE = Low):
 661          * we have to ensure the PLL is disabled before phys initialization.
 662          */
 663         if (readl_relaxed_poll_timeout(usbphyc->base + STM32_USBPHYC_PLL,
 664                                        pllen, !(pllen & PLLEN), 5, 50)) {
 665                 dev_warn(usbphyc->dev, "PLL not reset\n");
 666                 ret = -EPROBE_DEFER;
 667                 goto clk_disable;
 668         }
 669
 670         usbphyc->switch_setup = -EINVAL;
 671         usbphyc->nphys = of_get_child_count(np);
 672         usbphyc->phys = devm_kcalloc(dev, usbphyc->nphys,
 673                                      sizeof(*usbphyc->phys), GFP_KERNEL);
 674         if (!usbphyc->phys) {
 675                 ret = -ENOMEM;
 676                 goto clk_disable;
 677         }
 678
 679         usbphyc->vdda1v1 = devm_regulator_get(dev, "vdda1v1");
 680         if (IS_ERR(usbphyc->vdda1v1)) {
 681                 ret = dev_err_probe(dev, PTR_ERR(usbphyc->vdda1v1),
 682                                     "failed to get vdda1v1 supply\n");
 683                 goto clk_disable;
 684         }
 685
 686         usbphyc->vdda1v8 = devm_regulator_get(dev, "vdda1v8");
 687         if (IS_ERR(usbphyc->vdda1v8)) {
 688                 ret = dev_err_probe(dev, PTR_ERR(usbphyc->vdda1v8),
 689                                     "failed to get vdda1v8 supply\n");
 690                 goto clk_disable;
 691         }
 692
 693         for_each_child_of_node(np, child) {
 694                 struct stm32_usbphyc_phy *usbphyc_phy;
 695                 struct phy *phy;
 696                 u32 index;
 697
 698                 phy = devm_phy_create(dev, child, &stm32_usbphyc_phy_ops);
 699                 if (IS_ERR(phy)) {
 700                         ret = PTR_ERR(phy);
 701                         if (ret != -EPROBE_DEFER)
 702                                 dev_err(dev, "failed to create phy%d: %d\n",
 703                                         port, ret);
 704                         goto put_child;
 705                 }
 706
 707                 usbphyc_phy = devm_kzalloc(dev, sizeof(*usbphyc_phy),
 708                                            GFP_KERNEL);
 709                 if (!usbphyc_phy) {
 710                         ret = -ENOMEM;
 711                         goto put_child;
 712                 }
 713
 714                 ret = of_property_read_u32(child, "reg", &index);
 715                 if (ret || index > usbphyc->nphys) {
 716                         dev_err(&phy->dev, "invalid reg property: %d\n", ret);
 717                         if (!ret)
 718                                 ret = -EINVAL;
 719                         goto put_child;
 720                 }
 721
 722                 usbphyc->phys[port] = usbphyc_phy;
 723                 phy_set_bus_width(phy, 8);
 724                 phy_set_drvdata(phy, usbphyc_phy);
 725
 726                 usbphyc->phys[port]->phy = phy;
 727                 usbphyc->phys[port]->usbphyc = usbphyc;
 728                 usbphyc->phys[port]->index = index;
 729                 usbphyc->phys[port]->active = false;
 730
 731                 usbphyc->phys[port]->vbus = devm_regulator_get_optional(&phy->dev, "vbus");
 732                 if (IS_ERR(usbphyc->phys[port]->vbus)) {
 733                         ret = PTR_ERR(usbphyc->phys[port]->vbus);
 734                         if (ret == -EPROBE_DEFER)
 735                                 goto put_child;
 736                         usbphyc->phys[port]->vbus = NULL;
 737                 }
 738
 739                 /* Configure phy tuning */
 740                 stm32_usbphyc_phy_tuning(usbphyc, child, index);
 741
 742                 port++;
 743         }
 744
 745         phy_provider = devm_of_phy_provider_register(dev,
 746                                                      stm32_usbphyc_of_xlate);
 747         if (IS_ERR(phy_provider)) {
 748                 ret = PTR_ERR(phy_provider);
 749                 dev_err(dev, "failed to register phy provider: %d\n", ret);
 750                 goto clk_disable;
 751         }
 752
 753         ret = stm32_usbphyc_clk48_register(usbphyc);
 754         if (ret) {
 755                 dev_err(dev, "failed to register ck_usbo_48m clock: %d\n", ret);
 756                 goto clk_disable;
 757         }
 758
 759         version = readl_relaxed(usbphyc->base + STM32_USBPHYC_VERSION);
 760         dev_info(dev, "registered rev:%lu.%lu\n",
 761                  FIELD_GET(MAJREV, version), FIELD_GET(MINREV, version));
 762
 763         return 0;
 764
 765 put_child:
 766         of_node_put(child);
 767 clk_disable:
 768         clk_disable_unprepare(usbphyc->clk);
 769
 770         return ret;
 771 }
 772
 773 static void stm32_usbphyc_remove(struct platform_device *pdev)
 774 {
 775         struct stm32_usbphyc *usbphyc = dev_get_drvdata(&pdev->dev);
 776         int port;
 777
 778         /* Ensure PHYs are not active, to allow PLL disabling */
 779         for (port = 0; port < usbphyc->nphys; port++)
 780                 if (usbphyc->phys[port]->active)
 781                         stm32_usbphyc_phy_exit(usbphyc->phys[port]->phy);
 782
 783         stm32_usbphyc_clk48_unregister(usbphyc);
 784
 785         clk_disable_unprepare(usbphyc->clk);
 786 }
 787
 788 static int __maybe_unused stm32_usbphyc_resume(struct device *dev)
 789 {
 790         struct stm32_usbphyc *usbphyc = dev_get_drvdata(dev);
 791         struct stm32_usbphyc_phy *usbphyc_phy;
 792         int port;
 793
 794         if (usbphyc->switch_setup >= 0)
 795                 stm32_usbphyc_switch_setup(usbphyc, usbphyc->switch_setup);
 796
 797         for (port = 0; port < usbphyc->nphys; port++) {
 798                 usbphyc_phy = usbphyc->phys[port];
 799                 writel_relaxed(usbphyc_phy->tune, usbphyc->base + STM32_USBPHYC_TUNE(port));
 800         }
 801
 802         return 0;
 803 }
 804
 805 static SIMPLE_DEV_PM_OPS(stm32_usbphyc_pm_ops, NULL, stm32_usbphyc_resume);
 806
 807 static const struct of_device_id stm32_usbphyc_of_match[] = {
 808         { .compatible = "st,stm32mp1-usbphyc", },
 809         { },
 810 };
 811 MODULE_DEVICE_TABLE(of, stm32_usbphyc_of_match);
 812
 813 static struct platform_driver stm32_usbphyc_driver = {
 814         .probe = stm32_usbphyc_probe,
 815         .remove_new = stm32_usbphyc_remove,
 816         .driver = {
 817                 .of_match_table = stm32_usbphyc_of_match,
 818                 .name = "stm32-usbphyc",
 819                 .pm = &stm32_usbphyc_pm_ops,
 820         }
 821 };
 822 module_platform_driver(stm32_usbphyc_driver);
 823
 824 MODULE_DESCRIPTION("STMicroelectronics STM32 USBPHYC driver");
 825 MODULE_AUTHOR("Amelie Delaunay <amelie.delaunay@st.com>");
 826 MODULE_LICENSE("GPL v2");