drivers/phy/qualcomm/phy-qcom-qusb2.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (c) 2017, The Linux Foundation. All rights reserved.
   4  */
   5
   6 #include <linux/clk.h>
   7 #include <linux/delay.h>
   8 #include <linux/err.h>
   9 #include <linux/io.h>
  10 #include <linux/kernel.h>
  11 #include <linux/mfd/syscon.h>
  12 #include <linux/module.h>
  13 #include <linux/nvmem-consumer.h>
  14 #include <linux/of.h>
  15 #include <linux/of_device.h>
  16 #include <linux/phy/phy.h>
  17 #include <linux/platform_device.h>
  18 #include <linux/regmap.h>
  19 #include <linux/regulator/consumer.h>
  20 #include <linux/reset.h>
  21 #include <linux/slab.h>
  22
  23 #include <dt-bindings/phy/phy-qcom-qusb2.h>
  24
  25 #define QUSB2PHY_PLL_TEST               0x04
  26 #define CLK_REF_SEL                     BIT(7)
  27
  28 #define QUSB2PHY_PLL_TUNE               0x08
  29 #define QUSB2PHY_PLL_USER_CTL1          0x0c
  30 #define QUSB2PHY_PLL_USER_CTL2          0x10
  31 #define QUSB2PHY_PLL_AUTOPGM_CTL1       0x1c
  32 #define QUSB2PHY_PLL_PWR_CTRL           0x18
  33
  34 /* QUSB2PHY_PLL_STATUS register bits */
  35 #define PLL_LOCKED                      BIT(5)
  36
  37 /* QUSB2PHY_PLL_COMMON_STATUS_ONE register bits */
  38 #define CORE_READY_STATUS               BIT(0)
  39
  40 /* QUSB2PHY_PORT_POWERDOWN register bits */
  41 #define CLAMP_N_EN                      BIT(5)
  42 #define FREEZIO_N                       BIT(1)
  43 #define POWER_DOWN                      BIT(0)
  44
  45 /* QUSB2PHY_PWR_CTRL1 register bits */
  46 #define PWR_CTRL1_VREF_SUPPLY_TRIM      BIT(5)
  47 #define PWR_CTRL1_CLAMP_N_EN            BIT(1)
  48
  49 #define QUSB2PHY_REFCLK_ENABLE          BIT(0)
  50
  51 #define PHY_CLK_SCHEME_SEL              BIT(0)
  52
  53 /* QUSB2PHY_INTR_CTRL register bits */
  54 #define DMSE_INTR_HIGH_SEL                      BIT(4)
  55 #define DPSE_INTR_HIGH_SEL                      BIT(3)
  56 #define CHG_DET_INTR_EN                         BIT(2)
  57 #define DMSE_INTR_EN                            BIT(1)
  58 #define DPSE_INTR_EN                            BIT(0)
  59
  60 /* QUSB2PHY_PLL_CORE_INPUT_OVERRIDE register bits */
  61 #define CORE_PLL_EN_FROM_RESET                  BIT(4)
  62 #define CORE_RESET                              BIT(5)
  63 #define CORE_RESET_MUX                          BIT(6)
  64
  65 /* QUSB2PHY_IMP_CTRL1 register bits */
  66 #define IMP_RES_OFFSET_MASK                     GENMASK(5, 0)
  67 #define IMP_RES_OFFSET_SHIFT                    0x0
  68
  69 /* QUSB2PHY_PORT_TUNE1 register bits */
  70 #define HSTX_TRIM_MASK                          GENMASK(7, 4)
  71 #define HSTX_TRIM_SHIFT                         0x4
  72 #define PREEMPH_WIDTH_HALF_BIT                  BIT(2)
  73 #define PREEMPHASIS_EN_MASK                     GENMASK(1, 0)
  74 #define PREEMPHASIS_EN_SHIFT                    0x0
  75
  76 #define QUSB2PHY_PLL_ANALOG_CONTROLS_TWO        0x04
  77 #define QUSB2PHY_PLL_CLOCK_INVERTERS            0x18c
  78 #define QUSB2PHY_PLL_CMODE                      0x2c
  79 #define QUSB2PHY_PLL_LOCK_DELAY                 0x184
  80 #define QUSB2PHY_PLL_DIGITAL_TIMERS_TWO         0xb4
  81 #define QUSB2PHY_PLL_BIAS_CONTROL_1             0x194
  82 #define QUSB2PHY_PLL_BIAS_CONTROL_2             0x198
  83 #define QUSB2PHY_PWR_CTRL2                      0x214
  84 #define QUSB2PHY_IMP_CTRL1                      0x220
  85 #define QUSB2PHY_IMP_CTRL2                      0x224
  86 #define QUSB2PHY_CHG_CTRL2                      0x23c
  87
  88 struct qusb2_phy_init_tbl {
  89         unsigned int offset;
  90         unsigned int val;
  91         /*
  92          * register part of layout ?
  93          * if yes, then offset gives index in the reg-layout
  94          */
  95         int in_layout;
  96 };
  97
  98 #define QUSB2_PHY_INIT_CFG(o, v) \
  99         {                       \
 100                 .offset = o,    \
 101                 .val = v,       \
 102         }
 103
 104 #define QUSB2_PHY_INIT_CFG_L(o, v) \
 105         {                       \
 106                 .offset = o,    \
 107                 .val = v,       \
 108                 .in_layout = 1, \
 109         }
 110
 111 /* set of registers with offsets different per-PHY */
 112 enum qusb2phy_reg_layout {
 113         QUSB2PHY_PLL_CORE_INPUT_OVERRIDE,
 114         QUSB2PHY_PLL_STATUS,
 115         QUSB2PHY_PORT_TUNE1,
 116         QUSB2PHY_PORT_TUNE2,
 117         QUSB2PHY_PORT_TUNE3,
 118         QUSB2PHY_PORT_TUNE4,
 119         QUSB2PHY_PORT_TUNE5,
 120         QUSB2PHY_PORT_TEST1,
 121         QUSB2PHY_PORT_TEST2,
 122         QUSB2PHY_PORT_POWERDOWN,
 123         QUSB2PHY_INTR_CTRL,
 124 };
 125
 126 static const unsigned int msm8996_regs_layout[] = {
 127         [QUSB2PHY_PLL_STATUS]           = 0x38,
 128         [QUSB2PHY_PORT_TUNE1]           = 0x80,
 129         [QUSB2PHY_PORT_TUNE2]           = 0x84,
 130         [QUSB2PHY_PORT_TUNE3]           = 0x88,
 131         [QUSB2PHY_PORT_TUNE4]           = 0x8c,
 132         [QUSB2PHY_PORT_TUNE5]           = 0x90,
 133         [QUSB2PHY_PORT_TEST1]           = 0xb8,
 134         [QUSB2PHY_PORT_TEST2]           = 0x9c,
 135         [QUSB2PHY_PORT_POWERDOWN]       = 0xb4,
 136         [QUSB2PHY_INTR_CTRL]            = 0xbc,
 137 };
 138
 139 static const struct qusb2_phy_init_tbl msm8996_init_tbl[] = {
 140         QUSB2_PHY_INIT_CFG_L(QUSB2PHY_PORT_TUNE1, 0xf8),
 141         QUSB2_PHY_INIT_CFG_L(QUSB2PHY_PORT_TUNE2, 0xb3),
 142         QUSB2_PHY_INIT_CFG_L(QUSB2PHY_PORT_TUNE3, 0x83),
 143         QUSB2_PHY_INIT_CFG_L(QUSB2PHY_PORT_TUNE4, 0xc0),
 144
 145         QUSB2_PHY_INIT_CFG(QUSB2PHY_PLL_TUNE, 0x30),
 146         QUSB2_PHY_INIT_CFG(QUSB2PHY_PLL_USER_CTL1, 0x79),
 147         QUSB2_PHY_INIT_CFG(QUSB2PHY_PLL_USER_CTL2, 0x21),
 148
 149         QUSB2_PHY_INIT_CFG_L(QUSB2PHY_PORT_TEST2, 0x14),
 150
 151         QUSB2_PHY_INIT_CFG(QUSB2PHY_PLL_AUTOPGM_CTL1, 0x9f),
 152         QUSB2_PHY_INIT_CFG(QUSB2PHY_PLL_PWR_CTRL, 0x00),
 153 };
 154
 155 static const unsigned int sdm845_regs_layout[] = {
 156         [QUSB2PHY_PLL_CORE_INPUT_OVERRIDE] = 0xa8,
 157         [QUSB2PHY_PLL_STATUS]           = 0x1a0,
 158         [QUSB2PHY_PORT_TUNE1]           = 0x240,
 159         [QUSB2PHY_PORT_TUNE2]           = 0x244,
 160         [QUSB2PHY_PORT_TUNE3]           = 0x248,
 161         [QUSB2PHY_PORT_TUNE4]           = 0x24c,
 162         [QUSB2PHY_PORT_TUNE5]           = 0x250,
 163         [QUSB2PHY_PORT_TEST1]           = 0x254,
 164         [QUSB2PHY_PORT_TEST2]           = 0x258,
 165         [QUSB2PHY_PORT_POWERDOWN]       = 0x210,
 166         [QUSB2PHY_INTR_CTRL]            = 0x230,
 167 };
 168
 169 static const struct qusb2_phy_init_tbl sdm845_init_tbl[] = {
 170         QUSB2_PHY_INIT_CFG(QUSB2PHY_PLL_ANALOG_CONTROLS_TWO, 0x03),
 171         QUSB2_PHY_INIT_CFG(QUSB2PHY_PLL_CLOCK_INVERTERS, 0x7c),
 172         QUSB2_PHY_INIT_CFG(QUSB2PHY_PLL_CMODE, 0x80),
 173         QUSB2_PHY_INIT_CFG(QUSB2PHY_PLL_LOCK_DELAY, 0x0a),
 174         QUSB2_PHY_INIT_CFG(QUSB2PHY_PLL_DIGITAL_TIMERS_TWO, 0x19),
 175         QUSB2_PHY_INIT_CFG(QUSB2PHY_PLL_BIAS_CONTROL_1, 0x40),
 176         QUSB2_PHY_INIT_CFG(QUSB2PHY_PLL_BIAS_CONTROL_2, 0x20),
 177         QUSB2_PHY_INIT_CFG(QUSB2PHY_PWR_CTRL2, 0x21),
 178         QUSB2_PHY_INIT_CFG(QUSB2PHY_IMP_CTRL1, 0x0),
 179         QUSB2_PHY_INIT_CFG(QUSB2PHY_IMP_CTRL2, 0x58),
 180
 181         QUSB2_PHY_INIT_CFG_L(QUSB2PHY_PORT_TUNE1, 0x30),
 182         QUSB2_PHY_INIT_CFG_L(QUSB2PHY_PORT_TUNE2, 0x29),
 183         QUSB2_PHY_INIT_CFG_L(QUSB2PHY_PORT_TUNE3, 0xca),
 184         QUSB2_PHY_INIT_CFG_L(QUSB2PHY_PORT_TUNE4, 0x04),
 185         QUSB2_PHY_INIT_CFG_L(QUSB2PHY_PORT_TUNE5, 0x03),
 186
 187         QUSB2_PHY_INIT_CFG(QUSB2PHY_CHG_CTRL2, 0x0),
 188 };
 189
 190 struct qusb2_phy_cfg {
 191         const struct qusb2_phy_init_tbl *tbl;
 192         /* number of entries in the table */
 193         unsigned int tbl_num;
 194         /* offset to PHY_CLK_SCHEME register in TCSR map */
 195         unsigned int clk_scheme_offset;
 196
 197         /* array of registers with different offsets */
 198         const unsigned int *regs;
 199         unsigned int mask_core_ready;
 200         unsigned int disable_ctrl;
 201         unsigned int autoresume_en;
 202
 203         /* true if PHY has PLL_TEST register to select clk_scheme */
 204         bool has_pll_test;
 205
 206         /* true if TUNE1 register must be updated by fused value, else TUNE2 */
 207         bool update_tune1_with_efuse;
 208
 209         /* true if PHY has PLL_CORE_INPUT_OVERRIDE register to reset PLL */
 210         bool has_pll_override;
 211 };
 212
 213 static const struct qusb2_phy_cfg msm8996_phy_cfg = {
 214         .tbl            = msm8996_init_tbl,
 215         .tbl_num        = ARRAY_SIZE(msm8996_init_tbl),
 216         .regs           = msm8996_regs_layout,
 217
 218         .has_pll_test   = true,
 219         .disable_ctrl   = (CLAMP_N_EN | FREEZIO_N | POWER_DOWN),
 220         .mask_core_ready = PLL_LOCKED,
 221         .autoresume_en   = BIT(3),
 222 };
 223
 224 static const struct qusb2_phy_cfg sdm845_phy_cfg = {
 225         .tbl            = sdm845_init_tbl,
 226         .tbl_num        = ARRAY_SIZE(sdm845_init_tbl),
 227         .regs           = sdm845_regs_layout,
 228
 229         .disable_ctrl   = (PWR_CTRL1_VREF_SUPPLY_TRIM | PWR_CTRL1_CLAMP_N_EN |
 230                            POWER_DOWN),
 231         .mask_core_ready = CORE_READY_STATUS,
 232         .has_pll_override = true,
 233         .autoresume_en    = BIT(0),
 234         .update_tune1_with_efuse = true,
 235 };
 236
 237 static const char * const qusb2_phy_vreg_names[] = {
 238         "vdda-pll", "vdda-phy-dpdm",
 239 };
 240
 241 #define QUSB2_NUM_VREGS         ARRAY_SIZE(qusb2_phy_vreg_names)
 242
 243 /**
 244  * struct qusb2_phy - structure holding qusb2 phy attributes
 245  *
 246  * @phy: generic phy
 247  * @base: iomapped memory space for qubs2 phy
 248  *
 249  * @cfg_ahb_clk: AHB2PHY interface clock
 250  * @ref_clk: phy reference clock
 251  * @iface_clk: phy interface clock
 252  * @phy_reset: phy reset control
 253  * @vregs: regulator supplies bulk data
 254  *
 255  * @tcsr: TCSR syscon register map
 256  * @cell: nvmem cell containing phy tuning value
 257  *
 258  * @override_imp_res_offset: PHY should use different rescode offset
 259  * @imp_res_offset_value: rescode offset to be updated in IMP_CTRL1 register
 260  * @override_hstx_trim: PHY should use different HSTX o/p current value
 261  * @hstx_trim_value: HSTX_TRIM value to be updated in TUNE1 register
 262  * @override_preemphasis: PHY should use different pre-amphasis amplitude
 263  * @preemphasis_level: Amplitude Pre-Emphasis to be updated in TUNE1 register
 264  * @override_preemphasis_width: PHY should use different pre-emphasis duration
 265  * @preemphasis_width: half/full-width Pre-Emphasis updated via TUNE1
 266  *
 267  * @cfg: phy config data
 268  * @has_se_clk_scheme: indicate if PHY has single-ended ref clock scheme
 269  * @phy_initialized: indicate if PHY has been initialized
 270  * @mode: current PHY mode
 271  */
 272 struct qusb2_phy {
 273         struct phy *phy;
 274         void __iomem *base;
 275
 276         struct clk *cfg_ahb_clk;
 277         struct clk *ref_clk;
 278         struct clk *iface_clk;
 279         struct reset_control *phy_reset;
 280         struct regulator_bulk_data vregs[QUSB2_NUM_VREGS];
 281
 282         struct regmap *tcsr;
 283         struct nvmem_cell *cell;
 284
 285         bool override_imp_res_offset;
 286         u8 imp_res_offset_value;
 287         bool override_hstx_trim;
 288         u8 hstx_trim_value;
 289         bool override_preemphasis;
 290         u8 preemphasis_level;
 291         bool override_preemphasis_width;
 292         u8 preemphasis_width;
 293
 294         const struct qusb2_phy_cfg *cfg;
 295         bool has_se_clk_scheme;
 296         bool phy_initialized;
 297         enum phy_mode mode;
 298 };
 299
 300 static inline void qusb2_write_mask(void __iomem *base, u32 offset,
 301                                     u32 val, u32 mask)
 302 {
 303         u32 reg;
 304
 305         reg = readl(base + offset);
 306         reg &= ~mask;
 307         reg |= val & mask;
 308         writel(reg, base + offset);
 309
 310         /* Ensure above write is completed */
 311         readl(base + offset);
 312 }
 313
 314 static inline void qusb2_setbits(void __iomem *base, u32 offset, u32 val)
 315 {
 316         u32 reg;
 317
 318         reg = readl(base + offset);
 319         reg |= val;
 320         writel(reg, base + offset);
 321
 322         /* Ensure above write is completed */
 323         readl(base + offset);
 324 }
 325
 326 static inline void qusb2_clrbits(void __iomem *base, u32 offset, u32 val)
 327 {
 328         u32 reg;
 329
 330         reg = readl(base + offset);
 331         reg &= ~val;
 332         writel(reg, base + offset);
 333
 334         /* Ensure above write is completed */
 335         readl(base + offset);
 336 }
 337
 338 static inline
 339 void qcom_qusb2_phy_configure(void __iomem *base,
 340                               const unsigned int *regs,
 341                               const struct qusb2_phy_init_tbl tbl[], int num)
 342 {
 343         int i;
 344
 345         for (i = 0; i < num; i++) {
 346                 if (tbl[i].in_layout)
 347                         writel(tbl[i].val, base + regs[tbl[i].offset]);
 348                 else
 349                         writel(tbl[i].val, base + tbl[i].offset);
 350         }
 351 }
 352
 353 /*
 354  * Update board specific PHY tuning override values if specified from
 355  * device tree.
 356  */
 357 static void qusb2_phy_override_phy_params(struct qusb2_phy *qphy)
 358 {
 359         const struct qusb2_phy_cfg *cfg = qphy->cfg;
 360
 361         if (qphy->override_imp_res_offset)
 362                 qusb2_write_mask(qphy->base, QUSB2PHY_IMP_CTRL1,
 363                              qphy->imp_res_offset_value << IMP_RES_OFFSET_SHIFT,
 364                              IMP_RES_OFFSET_MASK);
 365
 366         if (qphy->override_hstx_trim)
 367                 qusb2_write_mask(qphy->base, cfg->regs[QUSB2PHY_PORT_TUNE1],
 368                                  qphy->hstx_trim_value << HSTX_TRIM_SHIFT,
 369                                  HSTX_TRIM_MASK);
 370
 371         if (qphy->override_preemphasis)
 372                 qusb2_write_mask(qphy->base, cfg->regs[QUSB2PHY_PORT_TUNE1],
 373                                 qphy->preemphasis_level << PREEMPHASIS_EN_SHIFT,
 374                                 PREEMPHASIS_EN_MASK);
 375
 376         if (qphy->override_preemphasis_width) {
 377                 if (qphy->preemphasis_width ==
 378                     QUSB2_V2_PREEMPHASIS_WIDTH_HALF_BIT)
 379                         qusb2_setbits(qphy->base,
 380                                       cfg->regs[QUSB2PHY_PORT_TUNE1],
 381                                       PREEMPH_WIDTH_HALF_BIT);
 382                 else
 383                         qusb2_clrbits(qphy->base,
 384                                       cfg->regs[QUSB2PHY_PORT_TUNE1],
 385                                       PREEMPH_WIDTH_HALF_BIT);
 386         }
 387 }
 388
 389 /*
 390  * Fetches HS Tx tuning value from nvmem and sets the
 391  * QUSB2PHY_PORT_TUNE1/2 register.
 392  * For error case, skip setting the value and use the default value.
 393  */
 394 static void qusb2_phy_set_tune2_param(struct qusb2_phy *qphy)
 395 {
 396         struct device *dev = &qphy->phy->dev;
 397         const struct qusb2_phy_cfg *cfg = qphy->cfg;
 398         u8 *val;
 399
 400         /* efuse register is optional */
 401         if (!qphy->cell)
 402                 return;
 403
 404         /*
 405          * Read efuse register having TUNE2/1 parameter's high nibble.
 406          * If efuse register shows value as 0x0 (indicating value is not
 407          * fused), or if we fail to find a valid efuse register setting,
 408          * then use default value for high nibble that we have already
 409          * set while configuring the phy.
 410          */
 411         val = nvmem_cell_read(qphy->cell, NULL);
 412         if (IS_ERR(val) || !val[0]) {
 413                 dev_dbg(dev, "failed to read a valid hs-tx trim value\n");
 414                 return;
 415         }
 416
 417         /* Fused TUNE1/2 value is the higher nibble only */
 418         if (cfg->update_tune1_with_efuse)
 419                 qusb2_write_mask(qphy->base, cfg->regs[QUSB2PHY_PORT_TUNE1],
 420                                  val[0] << HSTX_TRIM_SHIFT,
 421                                  HSTX_TRIM_MASK);
 422         else
 423                 qusb2_write_mask(qphy->base, cfg->regs[QUSB2PHY_PORT_TUNE2],
 424                                  val[0] << HSTX_TRIM_SHIFT,
 425                                  HSTX_TRIM_MASK);
 426 }
 427
 428 static int qusb2_phy_set_mode(struct phy *phy, enum phy_mode mode)
 429 {
 430         struct qusb2_phy *qphy = phy_get_drvdata(phy);
 431
 432         qphy->mode = mode;
 433
 434         return 0;
 435 }
 436
 437 static int __maybe_unused qusb2_phy_runtime_suspend(struct device *dev)
 438 {
 439         struct qusb2_phy *qphy = dev_get_drvdata(dev);
 440         const struct qusb2_phy_cfg *cfg = qphy->cfg;
 441         u32 intr_mask;
 442
 443         dev_vdbg(dev, "Suspending QUSB2 Phy, mode:%d\n", qphy->mode);
 444
 445         if (!qphy->phy_initialized) {
 446                 dev_vdbg(dev, "PHY not initialized, bailing out\n");
 447                 return 0;
 448         }
 449
 450         /*
 451          * Enable DP/DM interrupts to detect line state changes based on current
 452          * speed. In other words, enable the triggers _opposite_ of what the
 453          * current D+/D- levels are e.g. if currently D+ high, D- low
 454          * (HS 'J'/Suspend), configure the mask to trigger on D+ low OR D- high
 455          */
 456         intr_mask = DPSE_INTR_EN | DMSE_INTR_EN;
 457         switch (qphy->mode) {
 458         case PHY_MODE_USB_HOST_HS:
 459         case PHY_MODE_USB_HOST_FS:
 460         case PHY_MODE_USB_DEVICE_HS:
 461         case PHY_MODE_USB_DEVICE_FS:
 462                 intr_mask |= DMSE_INTR_HIGH_SEL;
 463                 break;
 464         case PHY_MODE_USB_HOST_LS:
 465         case PHY_MODE_USB_DEVICE_LS:
 466                 intr_mask |= DPSE_INTR_HIGH_SEL;
 467                 break;
 468         default:
 469                 /* No device connected, enable both DP/DM high interrupt */
 470                 intr_mask |= DMSE_INTR_HIGH_SEL;
 471                 intr_mask |= DPSE_INTR_HIGH_SEL;
 472                 break;
 473         }
 474
 475         writel(intr_mask, qphy->base + cfg->regs[QUSB2PHY_INTR_CTRL]);
 476
 477         /* hold core PLL into reset */
 478         if (cfg->has_pll_override) {
 479                 qusb2_setbits(qphy->base,
 480                               cfg->regs[QUSB2PHY_PLL_CORE_INPUT_OVERRIDE],
 481                               CORE_PLL_EN_FROM_RESET | CORE_RESET |
 482                               CORE_RESET_MUX);
 483         }
 484
 485         /* enable phy auto-resume only if device is connected on bus */
 486         if (qphy->mode != PHY_MODE_INVALID) {
 487                 qusb2_setbits(qphy->base, cfg->regs[QUSB2PHY_PORT_TEST1],
 488                               cfg->autoresume_en);
 489                 /* Autoresume bit has to be toggled in order to enable it */
 490                 qusb2_clrbits(qphy->base, cfg->regs[QUSB2PHY_PORT_TEST1],
 491                               cfg->autoresume_en);
 492         }
 493
 494         if (!qphy->has_se_clk_scheme)
 495                 clk_disable_unprepare(qphy->ref_clk);
 496
 497         clk_disable_unprepare(qphy->cfg_ahb_clk);
 498         clk_disable_unprepare(qphy->iface_clk);
 499
 500         return 0;
 501 }
 502
 503 static int __maybe_unused qusb2_phy_runtime_resume(struct device *dev)
 504 {
 505         struct qusb2_phy *qphy = dev_get_drvdata(dev);
 506         const struct qusb2_phy_cfg *cfg = qphy->cfg;
 507         int ret;
 508
 509         dev_vdbg(dev, "Resuming QUSB2 phy, mode:%d\n", qphy->mode);
 510
 511         if (!qphy->phy_initialized) {
 512                 dev_vdbg(dev, "PHY not initialized, bailing out\n");
 513                 return 0;
 514         }
 515
 516         ret = clk_prepare_enable(qphy->iface_clk);
 517         if (ret) {
 518                 dev_err(dev, "failed to enable iface_clk, %d\n", ret);
 519                 return ret;
 520         }
 521
 522         ret = clk_prepare_enable(qphy->cfg_ahb_clk);
 523         if (ret) {
 524                 dev_err(dev, "failed to enable cfg ahb clock, %d\n", ret);
 525                 goto disable_iface_clk;
 526         }
 527
 528         if (!qphy->has_se_clk_scheme) {
 529                 ret = clk_prepare_enable(qphy->ref_clk);
 530                 if (ret) {
 531                         dev_err(dev, "failed to enable ref clk, %d\n", ret);
 532                         goto disable_ahb_clk;
 533                 }
 534         }
 535
 536         writel(0x0, qphy->base + cfg->regs[QUSB2PHY_INTR_CTRL]);
 537
 538         /* bring core PLL out of reset */
 539         if (cfg->has_pll_override) {
 540                 qusb2_clrbits(qphy->base,
 541                               cfg->regs[QUSB2PHY_PLL_CORE_INPUT_OVERRIDE],
 542                               CORE_RESET | CORE_RESET_MUX);
 543         }
 544
 545         return 0;
 546
 547 disable_ahb_clk:
 548         clk_disable_unprepare(qphy->cfg_ahb_clk);
 549 disable_iface_clk:
 550         clk_disable_unprepare(qphy->iface_clk);
 551
 552         return ret;
 553 }
 554
 555 static int qusb2_phy_init(struct phy *phy)
 556 {
 557         struct qusb2_phy *qphy = phy_get_drvdata(phy);
 558         const struct qusb2_phy_cfg *cfg = qphy->cfg;
 559         unsigned int val = 0;
 560         unsigned int clk_scheme;
 561         int ret;
 562
 563         dev_vdbg(&phy->dev, "%s(): Initializing QUSB2 phy\n", __func__);
 564
 565         /* turn on regulator supplies */
 566         ret = regulator_bulk_enable(ARRAY_SIZE(qphy->vregs), qphy->vregs);
 567         if (ret)
 568                 return ret;
 569
 570         ret = clk_prepare_enable(qphy->iface_clk);
 571         if (ret) {
 572                 dev_err(&phy->dev, "failed to enable iface_clk, %d\n", ret);
 573                 goto poweroff_phy;
 574         }
 575
 576         /* enable ahb interface clock to program phy */
 577         ret = clk_prepare_enable(qphy->cfg_ahb_clk);
 578         if (ret) {
 579                 dev_err(&phy->dev, "failed to enable cfg ahb clock, %d\n", ret);
 580                 goto disable_iface_clk;
 581         }
 582
 583         /* Perform phy reset */
 584         ret = reset_control_assert(qphy->phy_reset);
 585         if (ret) {
 586                 dev_err(&phy->dev, "failed to assert phy_reset, %d\n", ret);
 587                 goto disable_ahb_clk;
 588         }
 589
 590         /* 100 us delay to keep PHY in reset mode */
 591         usleep_range(100, 150);
 592
 593         ret = reset_control_deassert(qphy->phy_reset);
 594         if (ret) {
 595                 dev_err(&phy->dev, "failed to de-assert phy_reset, %d\n", ret);
 596                 goto disable_ahb_clk;
 597         }
 598
 599         /* Disable the PHY */
 600         qusb2_setbits(qphy->base, cfg->regs[QUSB2PHY_PORT_POWERDOWN],
 601                       qphy->cfg->disable_ctrl);
 602
 603         if (cfg->has_pll_test) {
 604                 /* save reset value to override reference clock scheme later */
 605                 val = readl(qphy->base + QUSB2PHY_PLL_TEST);
 606         }
 607
 608         qcom_qusb2_phy_configure(qphy->base, cfg->regs, cfg->tbl,
 609                                  cfg->tbl_num);
 610
 611         /* Override board specific PHY tuning values */
 612         qusb2_phy_override_phy_params(qphy);
 613
 614         /* Set efuse value for tuning the PHY */
 615         qusb2_phy_set_tune2_param(qphy);
 616
 617         /* Enable the PHY */
 618         qusb2_clrbits(qphy->base, cfg->regs[QUSB2PHY_PORT_POWERDOWN],
 619                       POWER_DOWN);
 620
 621         /* Required to get phy pll lock successfully */
 622         usleep_range(150, 160);
 623
 624         /* Default is single-ended clock on msm8996 */
 625         qphy->has_se_clk_scheme = true;
 626         /*
 627          * read TCSR_PHY_CLK_SCHEME register to check if single-ended
 628          * clock scheme is selected. If yes, then disable differential
 629          * ref_clk and use single-ended clock, otherwise use differential
 630          * ref_clk only.
 631          */
 632         if (qphy->tcsr) {
 633                 ret = regmap_read(qphy->tcsr, qphy->cfg->clk_scheme_offset,
 634                                   &clk_scheme);
 635                 if (ret) {
 636                         dev_err(&phy->dev, "failed to read clk scheme reg\n");
 637                         goto assert_phy_reset;
 638                 }
 639
 640                 /* is it a differential clock scheme ? */
 641                 if (!(clk_scheme & PHY_CLK_SCHEME_SEL)) {
 642                         dev_vdbg(&phy->dev, "%s(): select differential clk\n",
 643                                  __func__);
 644                         qphy->has_se_clk_scheme = false;
 645                 } else {
 646                         dev_vdbg(&phy->dev, "%s(): select single-ended clk\n",
 647                                  __func__);
 648                 }
 649         }
 650
 651         if (!qphy->has_se_clk_scheme) {
 652                 ret = clk_prepare_enable(qphy->ref_clk);
 653                 if (ret) {
 654                         dev_err(&phy->dev, "failed to enable ref clk, %d\n",
 655                                 ret);
 656                         goto assert_phy_reset;
 657                 }
 658         }
 659
 660         if (cfg->has_pll_test) {
 661                 if (!qphy->has_se_clk_scheme)
 662                         val &= ~CLK_REF_SEL;
 663                 else
 664                         val |= CLK_REF_SEL;
 665
 666                 writel(val, qphy->base + QUSB2PHY_PLL_TEST);
 667
 668                 /* ensure above write is through */
 669                 readl(qphy->base + QUSB2PHY_PLL_TEST);
 670         }
 671
 672         /* Required to get phy pll lock successfully */
 673         usleep_range(100, 110);
 674
 675         val = readb(qphy->base + cfg->regs[QUSB2PHY_PLL_STATUS]);
 676         if (!(val & cfg->mask_core_ready)) {
 677                 dev_err(&phy->dev,
 678                         "QUSB2PHY pll lock failed: status reg = %x\n", val);
 679                 ret = -EBUSY;
 680                 goto disable_ref_clk;
 681         }
 682         qphy->phy_initialized = true;
 683
 684         return 0;
 685
 686 disable_ref_clk:
 687         if (!qphy->has_se_clk_scheme)
 688                 clk_disable_unprepare(qphy->ref_clk);
 689 assert_phy_reset:
 690         reset_control_assert(qphy->phy_reset);
 691 disable_ahb_clk:
 692         clk_disable_unprepare(qphy->cfg_ahb_clk);
 693 disable_iface_clk:
 694         clk_disable_unprepare(qphy->iface_clk);
 695 poweroff_phy:
 696         regulator_bulk_disable(ARRAY_SIZE(qphy->vregs), qphy->vregs);
 697
 698         return ret;
 699 }
 700
 701 static int qusb2_phy_exit(struct phy *phy)
 702 {
 703         struct qusb2_phy *qphy = phy_get_drvdata(phy);
 704
 705         /* Disable the PHY */
 706         qusb2_setbits(qphy->base, qphy->cfg->regs[QUSB2PHY_PORT_POWERDOWN],
 707                       qphy->cfg->disable_ctrl);
 708
 709         if (!qphy->has_se_clk_scheme)
 710                 clk_disable_unprepare(qphy->ref_clk);
 711
 712         reset_control_assert(qphy->phy_reset);
 713
 714         clk_disable_unprepare(qphy->cfg_ahb_clk);
 715         clk_disable_unprepare(qphy->iface_clk);
 716
 717         regulator_bulk_disable(ARRAY_SIZE(qphy->vregs), qphy->vregs);
 718
 719         qphy->phy_initialized = false;
 720
 721         return 0;
 722 }
 723
 724 static const struct phy_ops qusb2_phy_gen_ops = {
 725         .init           = qusb2_phy_init,
 726         .exit           = qusb2_phy_exit,
 727         .set_mode       = qusb2_phy_set_mode,
 728         .owner          = THIS_MODULE,
 729 };
 730
 731 static const struct of_device_id qusb2_phy_of_match_table[] = {
 732         {
 733                 .compatible     = "qcom,msm8996-qusb2-phy",
 734                 .data           = &msm8996_phy_cfg,
 735         }, {
 736                 .compatible     = "qcom,sdm845-qusb2-phy",
 737                 .data           = &sdm845_phy_cfg,
 738         },
 739         { },
 740 };
 741 MODULE_DEVICE_TABLE(of, qusb2_phy_of_match_table);
 742
 743 static const struct dev_pm_ops qusb2_phy_pm_ops = {
 744         SET_RUNTIME_PM_OPS(qusb2_phy_runtime_suspend,
 745                            qusb2_phy_runtime_resume, NULL)
 746 };
 747
 748 static int qusb2_phy_probe(struct platform_device *pdev)
 749 {
 750         struct device *dev = &pdev->dev;
 751         struct qusb2_phy *qphy;
 752         struct phy_provider *phy_provider;
 753         struct phy *generic_phy;
 754         struct resource *res;
 755         int ret, i;
 756         int num;
 757         u32 value;
 758
 759         qphy = devm_kzalloc(dev, sizeof(*qphy), GFP_KERNEL);
 760         if (!qphy)
 761                 return -ENOMEM;
 762
 763         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 764         qphy->base = devm_ioremap_resource(dev, res);
 765         if (IS_ERR(qphy->base))
 766                 return PTR_ERR(qphy->base);
 767
 768         qphy->cfg_ahb_clk = devm_clk_get(dev, "cfg_ahb");
 769         if (IS_ERR(qphy->cfg_ahb_clk)) {
 770                 ret = PTR_ERR(qphy->cfg_ahb_clk);
 771                 if (ret != -EPROBE_DEFER)
 772                         dev_err(dev, "failed to get cfg ahb clk, %d\n", ret);
 773                 return ret;
 774         }
 775
 776         qphy->ref_clk = devm_clk_get(dev, "ref");
 777         if (IS_ERR(qphy->ref_clk)) {
 778                 ret = PTR_ERR(qphy->ref_clk);
 779                 if (ret != -EPROBE_DEFER)
 780                         dev_err(dev, "failed to get ref clk, %d\n", ret);
 781                 return ret;
 782         }
 783
 784         qphy->iface_clk = devm_clk_get(dev, "iface");
 785         if (IS_ERR(qphy->iface_clk)) {
 786                 ret = PTR_ERR(qphy->iface_clk);
 787                 if (ret == -EPROBE_DEFER)
 788                         return ret;
 789                 qphy->iface_clk = NULL;
 790                 dev_dbg(dev, "failed to get iface clk, %d\n", ret);
 791         }
 792
 793         qphy->phy_reset = devm_reset_control_get_by_index(&pdev->dev, 0);
 794         if (IS_ERR(qphy->phy_reset)) {
 795                 dev_err(dev, "failed to get phy core reset\n");
 796                 return PTR_ERR(qphy->phy_reset);
 797         }
 798
 799         num = ARRAY_SIZE(qphy->vregs);
 800         for (i = 0; i < num; i++)
 801                 qphy->vregs[i].supply = qusb2_phy_vreg_names[i];
 802
 803         ret = devm_regulator_bulk_get(dev, num, qphy->vregs);
 804         if (ret) {
 805                 dev_err(dev, "failed to get regulator supplies\n");
 806                 return ret;
 807         }
 808
 809         /* Get the specific init parameters of QMP phy */
 810         qphy->cfg = of_device_get_match_data(dev);
 811
 812         qphy->tcsr = syscon_regmap_lookup_by_phandle(dev->of_node,
 813                                                         "qcom,tcsr-syscon");
 814         if (IS_ERR(qphy->tcsr)) {
 815                 dev_dbg(dev, "failed to lookup TCSR regmap\n");
 816                 qphy->tcsr = NULL;
 817         }
 818
 819         qphy->cell = devm_nvmem_cell_get(dev, NULL);
 820         if (IS_ERR(qphy->cell)) {
 821                 if (PTR_ERR(qphy->cell) == -EPROBE_DEFER)
 822                         return -EPROBE_DEFER;
 823                 qphy->cell = NULL;
 824                 dev_dbg(dev, "failed to lookup tune2 hstx trim value\n");
 825         }
 826
 827         if (!of_property_read_u32(dev->of_node, "qcom,imp-res-offset-value",
 828                                   &value)) {
 829                 qphy->imp_res_offset_value = (u8)value;
 830                 qphy->override_imp_res_offset = true;
 831         }
 832
 833         if (!of_property_read_u32(dev->of_node, "qcom,hstx-trim-value",
 834                                   &value)) {
 835                 qphy->hstx_trim_value = (u8)value;
 836                 qphy->override_hstx_trim = true;
 837         }
 838
 839         if (!of_property_read_u32(dev->of_node, "qcom,preemphasis-level",
 840                                      &value)) {
 841                 qphy->preemphasis_level = (u8)value;
 842                 qphy->override_preemphasis = true;
 843         }
 844
 845         if (!of_property_read_u32(dev->of_node, "qcom,preemphasis-width",
 846                                      &value)) {
 847                 qphy->preemphasis_width = (u8)value;
 848                 qphy->override_preemphasis_width = true;
 849         }
 850
 851         pm_runtime_set_active(dev);
 852         pm_runtime_enable(dev);
 853         /*
 854          * Prevent runtime pm from being ON by default. Users can enable
 855          * it using power/control in sysfs.
 856          */
 857         pm_runtime_forbid(dev);
 858
 859         generic_phy = devm_phy_create(dev, NULL, &qusb2_phy_gen_ops);
 860         if (IS_ERR(generic_phy)) {
 861                 ret = PTR_ERR(generic_phy);
 862                 dev_err(dev, "failed to create phy, %d\n", ret);
 863                 pm_runtime_disable(dev);
 864                 return ret;
 865         }
 866         qphy->phy = generic_phy;
 867
 868         dev_set_drvdata(dev, qphy);
 869         phy_set_drvdata(generic_phy, qphy);
 870
 871         phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
 872         if (!IS_ERR(phy_provider))
 873                 dev_info(dev, "Registered Qcom-QUSB2 phy\n");
 874         else
 875                 pm_runtime_disable(dev);
 876
 877         return PTR_ERR_OR_ZERO(phy_provider);
 878 }
 879
 880 static struct platform_driver qusb2_phy_driver = {
 881         .probe          = qusb2_phy_probe,
 882         .driver = {
 883                 .name   = "qcom-qusb2-phy",
 884                 .pm     = &qusb2_phy_pm_ops,
 885                 .of_match_table = qusb2_phy_of_match_table,
 886         },
 887 };
 888
 889 module_platform_driver(qusb2_phy_driver);
 890
 891 MODULE_AUTHOR("Vivek Gautam <vivek.gautam@codeaurora.org>");
 892 MODULE_DESCRIPTION("Qualcomm QUSB2 PHY driver");
 893 MODULE_LICENSE("GPL v2");