/* Copyright (c) 2018, The Linux Foundation. All rights reserved. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 and * only version 2 as published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. */ #define pr_fmt(fmt) "%s: " fmt, __func__ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #define REG_SIZE_PER_LPG 0x100 #define LPG_BASE "lpg-base" #define LUT_BASE "lut-base" /* LPG module registers */ #define REG_LPG_PERPH_SUBTYPE 0x05 #define REG_LPG_PATTERN_CONFIG 0x40 #define REG_LPG_PWM_SIZE_CLK 0x41 #define REG_LPG_PWM_FREQ_PREDIV_CLK 0x42 #define REG_LPG_PWM_TYPE_CONFIG 0x43 #define REG_LPG_PWM_VALUE_LSB 0x44 #define REG_LPG_PWM_VALUE_MSB 0x45 #define REG_LPG_ENABLE_CONTROL 0x46 #define REG_LPG_PWM_SYNC 0x47 #define REG_LPG_RAMP_STEP_DURATION_LSB 0x50 #define REG_LPG_RAMP_STEP_DURATION_MSB 0x51 #define REG_LPG_PAUSE_HI_MULTIPLIER 0x52 #define REG_LPG_PAUSE_LO_MULTIPLIER 0x54 #define REG_LPG_HI_INDEX 0x56 #define REG_LPG_LO_INDEX 0x57 /* REG_LPG_PATTERN_CONFIG */ #define LPG_PATTERN_EN_PAUSE_LO BIT(0) #define LPG_PATTERN_EN_PAUSE_HI BIT(1) #define LPG_PATTERN_RAMP_TOGGLE BIT(2) #define LPG_PATTERN_REPEAT BIT(3) #define LPG_PATTERN_RAMP_LO_TO_HI BIT(4) /* REG_LPG_PERPH_SUBTYPE */ #define SUBTYPE_PWM 0x0b #define SUBTYPE_LPG_LITE 0x11 /* REG_LPG_PWM_SIZE_CLK */ #define LPG_PWM_SIZE_LPG_MASK BIT(4) #define LPG_PWM_SIZE_PWM_MASK BIT(2) #define LPG_PWM_SIZE_LPG_SHIFT 4 #define LPG_PWM_SIZE_PWM_SHIFT 2 #define LPG_PWM_CLK_FREQ_SEL_MASK GENMASK(1, 0) /* REG_LPG_PWM_FREQ_PREDIV_CLK */ #define LPG_PWM_FREQ_PREDIV_MASK GENMASK(6, 5) #define LPG_PWM_FREQ_PREDIV_SHIFT 5 #define LPG_PWM_FREQ_EXPONENT_MASK GENMASK(2, 0) /* REG_LPG_PWM_TYPE_CONFIG */ #define LPG_PWM_EN_GLITCH_REMOVAL_MASK BIT(5) /* REG_LPG_PWM_VALUE_LSB */ #define LPG_PWM_VALUE_LSB_MASK GENMASK(7, 0) /* REG_LPG_PWM_VALUE_MSB */ #define LPG_PWM_VALUE_MSB_MASK BIT(0) /* REG_LPG_ENABLE_CONTROL */ #define LPG_EN_LPG_OUT_BIT BIT(7) #define LPG_EN_LPG_OUT_SHIFT 7 #define LPG_PWM_SRC_SELECT_MASK BIT(2) #define LPG_PWM_SRC_SELECT_SHIFT 2 #define LPG_EN_RAMP_GEN_MASK BIT(1) #define LPG_EN_RAMP_GEN_SHIFT 1 /* REG_LPG_PWM_SYNC */ #define LPG_PWM_VALUE_SYNC BIT(0) #define NUM_PWM_SIZE 2 #define NUM_PWM_CLK 3 #define NUM_CLK_PREDIV 4 #define NUM_PWM_EXP 8 #define LPG_HI_LO_IDX_MASK GENMASK(5, 0) /* LUT module registers */ #define REG_LPG_LUT_1_LSB 0x42 #define REG_LPG_LUT_RAMP_CONTROL 0xc8 #define LPG_LUT_VALUE_MSB_MASK BIT(0) #define LPG_LUT_COUNT_MAX 47 enum lpg_src { LUT_PATTERN = 0, PWM_VALUE, }; static const int pwm_size[NUM_PWM_SIZE] = {6, 9}; static const int clk_freq_hz[NUM_PWM_CLK] = {1024, 32768, 19200000}; static const int clk_prediv[NUM_CLK_PREDIV] = {1, 3, 5, 6}; static const int pwm_exponent[NUM_PWM_EXP] = {0, 1, 2, 3, 4, 5, 6, 7}; struct lpg_ramp_config { u16 step_ms; u8 pause_hi_count; u8 pause_lo_count; u8 hi_idx; u8 lo_idx; bool ramp_dir_low_to_hi; bool pattern_repeat; bool toggle; u32 *pattern; u32 pattern_length; }; struct lpg_pwm_config { u32 pwm_size; u32 pwm_clk; u32 prediv; u32 clk_exp; u16 pwm_value; u32 best_period_ns; }; struct qpnp_lpg_lut { struct qpnp_lpg_chip *chip; struct mutex lock; u32 reg_base; u32 *pattern; /* patterns in percentage */ }; struct qpnp_lpg_channel { struct qpnp_lpg_chip *chip; struct lpg_pwm_config pwm_config; struct lpg_ramp_config ramp_config; u32 lpg_idx; u32 reg_base; u32 max_pattern_length; u8 src_sel; u8 subtype; bool lut_written; int current_period_ns; int current_duty_ns; }; struct qpnp_lpg_chip { struct pwm_chip pwm_chip; struct regmap *regmap; struct device *dev; struct qpnp_lpg_channel *lpgs; struct qpnp_lpg_lut *lut; struct mutex bus_lock; u32 num_lpgs; }; static int qpnp_lpg_read(struct qpnp_lpg_channel *lpg, u16 addr, u8 *val) { int rc; unsigned int tmp; mutex_lock(&lpg->chip->bus_lock); rc = regmap_read(lpg->chip->regmap, lpg->reg_base + addr, &tmp); if (rc < 0) dev_err(lpg->chip->dev, "Read addr 0x%x failed, rc=%d\n", lpg->reg_base + addr, rc); else *val = (u8)tmp; mutex_unlock(&lpg->chip->bus_lock); return rc; } static int qpnp_lpg_write(struct qpnp_lpg_channel *lpg, u16 addr, u8 val) { int rc; mutex_lock(&lpg->chip->bus_lock); rc = regmap_write(lpg->chip->regmap, lpg->reg_base + addr, val); if (rc < 0) dev_err(lpg->chip->dev, "Write addr 0x%x with value %d failed, rc=%d\n", lpg->reg_base + addr, val, rc); mutex_unlock(&lpg->chip->bus_lock); return rc; } static int qpnp_lpg_masked_write(struct qpnp_lpg_channel *lpg, u16 addr, u8 mask, u8 val) { int rc; mutex_lock(&lpg->chip->bus_lock); rc = regmap_update_bits(lpg->chip->regmap, lpg->reg_base + addr, mask, val); if (rc < 0) dev_err(lpg->chip->dev, "Update addr 0x%x to val 0x%x with mask 0x%x failed, rc=%d\n", lpg->reg_base + addr, val, mask, rc); mutex_unlock(&lpg->chip->bus_lock); return rc; } static int qpnp_lut_write(struct qpnp_lpg_lut *lut, u16 addr, u8 val) { int rc; mutex_lock(&lut->chip->bus_lock); rc = regmap_write(lut->chip->regmap, lut->reg_base + addr, val); if (rc < 0) dev_err(lut->chip->dev, "Write addr 0x%x with value %d failed, rc=%d\n", lut->reg_base + addr, val, rc); mutex_unlock(&lut->chip->bus_lock); return rc; } static int qpnp_lut_masked_write(struct qpnp_lpg_lut *lut, u16 addr, u8 mask, u8 val) { int rc; mutex_lock(&lut->chip->bus_lock); rc = regmap_update_bits(lut->chip->regmap, lut->reg_base + addr, mask, val); if (rc < 0) dev_err(lut->chip->dev, "Update addr 0x%x to val 0x%x with mask 0x%x failed, rc=%d\n", lut->reg_base + addr, val, mask, rc); mutex_unlock(&lut->chip->bus_lock); return rc; } static struct qpnp_lpg_channel *pwm_dev_to_qpnp_lpg(struct pwm_chip *pwm_chip, struct pwm_device *pwm) { struct qpnp_lpg_chip *chip = container_of(pwm_chip, struct qpnp_lpg_chip, pwm_chip); u32 hw_idx = pwm->hwpwm; if (hw_idx >= chip->num_lpgs) { dev_err(chip->dev, "hw index %d out of range [0-%d]\n", hw_idx, chip->num_lpgs - 1); return NULL; } return &chip->lpgs[hw_idx]; } static int __find_index_in_array(int member, const int array[], int length) { int i; for (i = 0; i < length; i++) { if (member == array[i]) return i; } return -EINVAL; } static int qpnp_lpg_set_glitch_removal(struct qpnp_lpg_channel *lpg, bool en) { int rc; u8 mask, val; val = en ? LPG_PWM_EN_GLITCH_REMOVAL_MASK : 0; mask = LPG_PWM_EN_GLITCH_REMOVAL_MASK; rc = qpnp_lpg_masked_write(lpg, REG_LPG_PWM_TYPE_CONFIG, mask, val); if (rc < 0) dev_err(lpg->chip->dev, "Write LPG_PWM_TYPE_CONFIG failed, rc=%d\n", rc); return rc; } static int qpnp_lpg_set_pwm_config(struct qpnp_lpg_channel *lpg) { int rc; u8 val, mask, shift; int pwm_size_idx, pwm_clk_idx, prediv_idx, clk_exp_idx; pwm_size_idx = __find_index_in_array(lpg->pwm_config.pwm_size, pwm_size, ARRAY_SIZE(pwm_size)); pwm_clk_idx = __find_index_in_array(lpg->pwm_config.pwm_clk, clk_freq_hz, ARRAY_SIZE(clk_freq_hz)); prediv_idx = __find_index_in_array(lpg->pwm_config.prediv, clk_prediv, ARRAY_SIZE(clk_prediv)); clk_exp_idx = __find_index_in_array(lpg->pwm_config.clk_exp, pwm_exponent, ARRAY_SIZE(pwm_exponent)); if (pwm_size_idx < 0 || pwm_clk_idx < 0 || prediv_idx < 0 || clk_exp_idx < 0) return -EINVAL; /* pwm_clk_idx is 1 bit lower than the register value */ pwm_clk_idx += 1; if (lpg->subtype == SUBTYPE_PWM) { shift = LPG_PWM_SIZE_PWM_SHIFT; mask = LPG_PWM_SIZE_PWM_MASK; } else { shift = LPG_PWM_SIZE_LPG_SHIFT; mask = LPG_PWM_SIZE_LPG_MASK; } val = pwm_size_idx << shift | pwm_clk_idx; mask |= LPG_PWM_CLK_FREQ_SEL_MASK; rc = qpnp_lpg_masked_write(lpg, REG_LPG_PWM_SIZE_CLK, mask, val); if (rc < 0) { dev_err(lpg->chip->dev, "Write LPG_PWM_SIZE_CLK failed, rc=%d\n", rc); return rc; } val = prediv_idx << LPG_PWM_FREQ_PREDIV_SHIFT | clk_exp_idx; mask = LPG_PWM_FREQ_PREDIV_MASK | LPG_PWM_FREQ_EXPONENT_MASK; rc = qpnp_lpg_masked_write(lpg, REG_LPG_PWM_FREQ_PREDIV_CLK, mask, val); if (rc < 0) { dev_err(lpg->chip->dev, "Write LPG_PWM_FREQ_PREDIV_CLK failed, rc=%d\n", rc); return rc; } if (lpg->src_sel == LUT_PATTERN) return 0; val = lpg->pwm_config.pwm_value & LPG_PWM_VALUE_LSB_MASK; rc = qpnp_lpg_write(lpg, REG_LPG_PWM_VALUE_LSB, val); if (rc < 0) { dev_err(lpg->chip->dev, "Write LPG_PWM_VALUE_LSB failed, rc=%d\n", rc); return rc; } val = lpg->pwm_config.pwm_value >> 8; mask = LPG_PWM_VALUE_MSB_MASK; rc = qpnp_lpg_masked_write(lpg, REG_LPG_PWM_VALUE_MSB, mask, val); if (rc < 0) { dev_err(lpg->chip->dev, "Write LPG_PWM_VALUE_MSB failed, rc=%d\n", rc); return rc; } val = LPG_PWM_VALUE_SYNC; rc = qpnp_lpg_write(lpg, REG_LPG_PWM_SYNC, val); if (rc < 0) { dev_err(lpg->chip->dev, "Write LPG_PWM_SYNC failed, rc=%d\n", rc); return rc; } return rc; } static int qpnp_lpg_set_lut_pattern(struct qpnp_lpg_channel *lpg, unsigned int *pattern, unsigned int length) { struct qpnp_lpg_lut *lut = lpg->chip->lut; int i, rc = 0; u16 full_duty_value, pwm_values[LPG_LUT_COUNT_MAX + 1] = {0}; u8 lsb, msb, addr; if (length > lpg->max_pattern_length) { dev_err(lpg->chip->dev, "new pattern length (%d) larger than predefined (%d)\n", length, lpg->max_pattern_length); return -EINVAL; } /* Program LUT pattern */ mutex_lock(&lut->lock); addr = REG_LPG_LUT_1_LSB + lpg->ramp_config.lo_idx * 2; for (i = 0; i < length; i++) { full_duty_value = 1 << lpg->pwm_config.pwm_size; pwm_values[i] = pattern[i] * full_duty_value / 100; if (unlikely(pwm_values[i] > full_duty_value)) { dev_err(lpg->chip->dev, "PWM value %d exceed the max %d\n", pwm_values[i], full_duty_value); rc = -EINVAL; goto unlock; } if (pwm_values[i] == full_duty_value) pwm_values[i] = full_duty_value - 1; lsb = pwm_values[i] & 0xff; msb = pwm_values[i] >> 8; rc = qpnp_lut_write(lut, addr++, lsb); if (rc < 0) { dev_err(lpg->chip->dev, "Write NO.%d LUT pattern LSB (%d) failed, rc=%d", i, lsb, rc); goto unlock; } rc = qpnp_lut_masked_write(lut, addr++, LPG_LUT_VALUE_MSB_MASK, msb); if (rc < 0) { dev_err(lpg->chip->dev, "Write NO.%d LUT pattern MSB (%d) failed, rc=%d", i, msb, rc); goto unlock; } } lpg->ramp_config.pattern_length = length; unlock: mutex_unlock(&lut->lock); return rc; } static int qpnp_lpg_set_ramp_config(struct qpnp_lpg_channel *lpg) { struct lpg_ramp_config *ramp = &lpg->ramp_config; u8 lsb, msb, addr, mask, val; int rc = 0; /* Set ramp step duration */ lsb = ramp->step_ms & 0xff; msb = ramp->step_ms >> 8; addr = REG_LPG_RAMP_STEP_DURATION_LSB; rc = qpnp_lpg_write(lpg, addr, lsb); if (rc < 0) { dev_err(lpg->chip->dev, "Write RAMP_STEP_DURATION_LSB failed, rc=%d\n", rc); return rc; } rc = qpnp_lpg_write(lpg, addr + 1, msb); if (rc < 0) { dev_err(lpg->chip->dev, "Write RAMP_STEP_DURATION_MSB failed, rc=%d\n", rc); return rc; } /* Set hi_idx and lo_idx */ rc = qpnp_lpg_masked_write(lpg, REG_LPG_HI_INDEX, LPG_HI_LO_IDX_MASK, ramp->hi_idx); if (rc < 0) { dev_err(lpg->chip->dev, "Write LPG_HI_IDX failed, rc=%d\n", rc); return rc; } rc = qpnp_lpg_masked_write(lpg, REG_LPG_LO_INDEX, LPG_HI_LO_IDX_MASK, ramp->lo_idx); if (rc < 0) { dev_err(lpg->chip->dev, "Write LPG_LO_IDX failed, rc=%d\n", rc); return rc; } /* Set pause_hi/lo_count */ rc = qpnp_lpg_write(lpg, REG_LPG_PAUSE_HI_MULTIPLIER, ramp->pause_hi_count); if (rc < 0) { dev_err(lpg->chip->dev, "Write LPG_PAUSE_HI_MULTIPLIER failed, rc=%d\n", rc); return rc; } rc = qpnp_lpg_write(lpg, REG_LPG_PAUSE_LO_MULTIPLIER, ramp->pause_lo_count); if (rc < 0) { dev_err(lpg->chip->dev, "Write LPG_PAUSE_LO_MULTIPLIER failed, rc=%d\n", rc); return rc; } /* Set LPG_PATTERN_CONFIG */ addr = REG_LPG_PATTERN_CONFIG; mask = LPG_PATTERN_EN_PAUSE_LO | LPG_PATTERN_EN_PAUSE_HI | LPG_PATTERN_RAMP_TOGGLE | LPG_PATTERN_REPEAT | LPG_PATTERN_RAMP_LO_TO_HI; val = 0; if (ramp->pause_lo_count != 0) val |= LPG_PATTERN_EN_PAUSE_LO; if (ramp->pause_hi_count != 0) val |= LPG_PATTERN_EN_PAUSE_HI; if (ramp->ramp_dir_low_to_hi) val |= LPG_PATTERN_RAMP_LO_TO_HI; if (ramp->pattern_repeat) val |= LPG_PATTERN_REPEAT; if (ramp->toggle) val |= LPG_PATTERN_RAMP_TOGGLE; rc = qpnp_lpg_masked_write(lpg, addr, mask, val); if (rc < 0) { dev_err(lpg->chip->dev, "Write LPG_PATTERN_CONFIG failed, rc=%d\n", rc); return rc; } return rc; } static void __qpnp_lpg_calc_pwm_period(int period_ns, struct lpg_pwm_config *pwm_config) { struct lpg_pwm_config configs[NUM_PWM_SIZE]; int i, j, m, n; int tmp1, tmp2; int clk_period_ns = 0, pwm_clk_period_ns; int clk_delta_ns = INT_MAX, min_clk_delta_ns = INT_MAX; int pwm_period_delta = INT_MAX, min_pwm_period_delta = INT_MAX; int pwm_size_step; /* * (2^pwm_size) * (2^pwm_exp) * prediv * NSEC_PER_SEC * pwm_period = --------------------------------------------------- * clk_freq_hz * * Searching the closest settings for the requested PWM period. */ for (n = 0; n < ARRAY_SIZE(pwm_size); n++) { pwm_clk_period_ns = period_ns >> pwm_size[n]; for (i = ARRAY_SIZE(clk_freq_hz) - 1; i >= 0; i--) { for (j = 0; j < ARRAY_SIZE(clk_prediv); j++) { for (m = 0; m < ARRAY_SIZE(pwm_exponent); m++) { tmp1 = 1 << pwm_exponent[m]; tmp1 *= clk_prediv[j]; tmp2 = NSEC_PER_SEC / clk_freq_hz[i]; clk_period_ns = tmp1 * tmp2; clk_delta_ns = abs(pwm_clk_period_ns - clk_period_ns); /* * Find the closest setting for * PWM frequency predivide value */ if (clk_delta_ns < min_clk_delta_ns) { min_clk_delta_ns = clk_delta_ns; configs[n].pwm_clk = clk_freq_hz[i]; configs[n].prediv = clk_prediv[j]; configs[n].clk_exp = pwm_exponent[m]; configs[n].pwm_size = pwm_size[n]; configs[n].best_period_ns = clk_period_ns; } } } } configs[n].best_period_ns *= 1 << pwm_size[n]; /* Find the closest setting for PWM period */ if (min_clk_delta_ns < INT_MAX >> pwm_size[n]) pwm_period_delta = min_clk_delta_ns << pwm_size[n]; else pwm_period_delta = INT_MAX; if (pwm_period_delta < min_pwm_period_delta) { min_pwm_period_delta = pwm_period_delta; memcpy(pwm_config, &configs[n], sizeof(struct lpg_pwm_config)); } } /* Larger PWM size can achieve better resolution for PWM duty */ for (n = ARRAY_SIZE(pwm_size) - 1; n > 0; n--) { if (pwm_config->pwm_size >= pwm_size[n]) break; pwm_size_step = pwm_size[n] - pwm_config->pwm_size; if (pwm_config->clk_exp >= pwm_size_step) { pwm_config->pwm_size = pwm_size[n]; pwm_config->clk_exp -= pwm_size_step; } } pr_debug("PWM setting for period_ns %d: pwm_clk = %dHZ, prediv = %d, exponent = %d, pwm_size = %d\n", period_ns, pwm_config->pwm_clk, pwm_config->prediv, pwm_config->clk_exp, pwm_config->pwm_size); pr_debug("Actual period: %dns\n", pwm_config->best_period_ns); } static void __qpnp_lpg_calc_pwm_duty(int period_ns, int duty_ns, struct lpg_pwm_config *pwm_config) { u16 pwm_value, max_pwm_value; if ((1 << pwm_config->pwm_size) > (INT_MAX / duty_ns)) pwm_value = duty_ns / (period_ns >> pwm_config->pwm_size); else pwm_value = (duty_ns << pwm_config->pwm_size) / period_ns; max_pwm_value = (1 << pwm_config->pwm_size) - 1; if (pwm_value > max_pwm_value) pwm_value = max_pwm_value; pwm_config->pwm_value = pwm_value; } static int qpnp_lpg_pwm_config(struct pwm_chip *pwm_chip, struct pwm_device *pwm, int duty_ns, int period_ns) { struct qpnp_lpg_channel *lpg; int rc = 0; lpg = pwm_dev_to_qpnp_lpg(pwm_chip, pwm); if (lpg == NULL) { dev_err(pwm_chip->dev, "lpg not found\n"); return -ENODEV; } if (duty_ns > period_ns) { dev_err(pwm_chip->dev, "Duty %dns is larger than period %dns\n", duty_ns, period_ns); return -EINVAL; } if (period_ns != lpg->current_period_ns) { __qpnp_lpg_calc_pwm_period(period_ns, &lpg->pwm_config); /* program LUT if PWM period is changed */ if (lpg->src_sel == LUT_PATTERN) { rc = qpnp_lpg_set_lut_pattern(lpg, lpg->ramp_config.pattern, lpg->ramp_config.pattern_length); if (rc < 0) { dev_err(pwm_chip->dev, "set LUT pattern failed for LPG%d, rc=%d\n", lpg->lpg_idx, rc); return rc; } lpg->lut_written = true; } } if (period_ns != lpg->current_period_ns || duty_ns != lpg->current_duty_ns) __qpnp_lpg_calc_pwm_duty(period_ns, duty_ns, &lpg->pwm_config); rc = qpnp_lpg_set_pwm_config(lpg); if (rc < 0) { dev_err(pwm_chip->dev, "Config PWM failed for channel %d, rc=%d\n", lpg->lpg_idx, rc); return rc; } lpg->current_period_ns = period_ns; lpg->current_duty_ns = duty_ns; return rc; } static int qpnp_lpg_pwm_src_enable(struct qpnp_lpg_channel *lpg, bool en) { struct qpnp_lpg_chip *chip = lpg->chip; struct qpnp_lpg_lut *lut = chip->lut; u8 mask, val; int rc; mask = LPG_PWM_SRC_SELECT_MASK | LPG_EN_LPG_OUT_BIT | LPG_EN_RAMP_GEN_MASK; val = lpg->src_sel << LPG_PWM_SRC_SELECT_SHIFT; if (lpg->src_sel == LUT_PATTERN) val |= 1 << LPG_EN_RAMP_GEN_SHIFT; if (en) val |= 1 << LPG_EN_LPG_OUT_SHIFT; rc = qpnp_lpg_masked_write(lpg, REG_LPG_ENABLE_CONTROL, mask, val); if (rc < 0) { dev_err(chip->dev, "Write LPG_ENABLE_CONTROL failed, rc=%d\n", rc); return rc; } if (lpg->src_sel == LUT_PATTERN && en) { mutex_lock(&lut->lock); val = 1 << lpg->lpg_idx; rc = qpnp_lut_write(lut, REG_LPG_LUT_RAMP_CONTROL, val); if (rc < 0) dev_err(chip->dev, "Write LPG_LUT_RAMP_CONTROL failed, rc=%d\n", rc); mutex_unlock(&lut->lock); } return rc; } static int qpnp_lpg_pwm_set_output_type(struct pwm_chip *pwm_chip, struct pwm_device *pwm, enum pwm_output_type output_type) { struct qpnp_lpg_channel *lpg; enum lpg_src src_sel; int rc; lpg = pwm_dev_to_qpnp_lpg(pwm_chip, pwm); if (lpg == NULL) { dev_err(pwm_chip->dev, "lpg not found\n"); return -ENODEV; } if (lpg->chip->lut == NULL) { pr_debug("lpg%d only support PWM mode\n", lpg->lpg_idx); return 0; } src_sel = (output_type == PWM_OUTPUT_MODULATED) ? LUT_PATTERN : PWM_VALUE; if (src_sel == lpg->src_sel) return 0; if (src_sel == LUT_PATTERN) { /* program LUT if it's never been programmed */ if (!lpg->lut_written) { rc = qpnp_lpg_set_lut_pattern(lpg, lpg->ramp_config.pattern, lpg->ramp_config.pattern_length); if (rc < 0) { dev_err(pwm_chip->dev, "set LUT pattern failed for LPG%d, rc=%d\n", lpg->lpg_idx, rc); return rc; } lpg->lut_written = true; } rc = qpnp_lpg_set_ramp_config(lpg); if (rc < 0) { dev_err(pwm_chip->dev, "Config LPG%d ramping failed, rc=%d\n", lpg->lpg_idx, rc); return rc; } } lpg->src_sel = src_sel; if (pwm_is_enabled(pwm)) { rc = qpnp_lpg_pwm_src_enable(lpg, true); if (rc < 0) { dev_err(pwm_chip->dev, "Enable PWM output failed for channel %d, rc=%d\n", lpg->lpg_idx, rc); return rc; } } return 0; } static int qpnp_lpg_pwm_set_output_pattern(struct pwm_chip *pwm_chip, struct pwm_device *pwm, struct pwm_output_pattern *output_pattern) { struct qpnp_lpg_channel *lpg; int rc = 0, i, period_ns, duty_ns; u32 *percentages; lpg = pwm_dev_to_qpnp_lpg(pwm_chip, pwm); if (lpg == NULL) { dev_err(pwm_chip->dev, "lpg not found\n"); return -ENODEV; } if (output_pattern->num_entries > lpg->max_pattern_length) { dev_err(lpg->chip->dev, "pattern length %d shouldn't exceed %d\n", output_pattern->num_entries, lpg->max_pattern_length); return -EINVAL; } percentages = kcalloc(output_pattern->num_entries, sizeof(u32), GFP_KERNEL); if (!percentages) return -ENOMEM; period_ns = pwm_get_period(pwm); for (i = 0; i < output_pattern->num_entries; i++) { duty_ns = output_pattern->duty_pattern[i]; if (duty_ns > period_ns) { dev_err(lpg->chip->dev, "duty %dns is larger than period %dns\n", duty_ns, period_ns); goto err; } /* Translate the pattern in duty_ns to percentage */ if ((INT_MAX / duty_ns) < 100) percentages[i] = duty_ns / (period_ns / 100); else percentages[i] = (duty_ns * 100) / period_ns; } rc = qpnp_lpg_set_lut_pattern(lpg, percentages, output_pattern->num_entries); if (rc < 0) { dev_err(lpg->chip->dev, "Set LUT pattern failed for LPG%d, rc=%d\n", lpg->lpg_idx, rc); goto err; } lpg->lut_written = true; memcpy(lpg->ramp_config.pattern, percentages, output_pattern->num_entries); lpg->ramp_config.hi_idx = lpg->ramp_config.lo_idx + output_pattern->num_entries - 1; if ((INT_MAX / period_ns) > output_pattern->cycles_per_duty) lpg->ramp_config.step_ms = output_pattern->cycles_per_duty * period_ns / NSEC_PER_MSEC; else lpg->ramp_config.step_ms = (period_ns / NSEC_PER_MSEC) * output_pattern->cycles_per_duty; rc = qpnp_lpg_set_ramp_config(lpg); if (rc < 0) dev_err(pwm_chip->dev, "Config LPG%d ramping failed, rc=%d\n", lpg->lpg_idx, rc); err: kfree(percentages); return rc; } static int qpnp_lpg_pwm_enable(struct pwm_chip *pwm_chip, struct pwm_device *pwm) { struct qpnp_lpg_channel *lpg; int rc = 0; lpg = pwm_dev_to_qpnp_lpg(pwm_chip, pwm); if (lpg == NULL) { dev_err(pwm_chip->dev, "lpg not found\n"); return -ENODEV; } rc = qpnp_lpg_set_glitch_removal(lpg, true); if (rc < 0) { dev_err(lpg->chip->dev, "Enable glitch-removal failed, rc=%d\n", rc); return rc; } rc = qpnp_lpg_pwm_src_enable(lpg, true); if (rc < 0) dev_err(pwm_chip->dev, "Enable PWM output failed for channel %d, rc=%d\n", lpg->lpg_idx, rc); return rc; } static void qpnp_lpg_pwm_disable(struct pwm_chip *pwm_chip, struct pwm_device *pwm) { struct qpnp_lpg_channel *lpg; int rc; lpg = pwm_dev_to_qpnp_lpg(pwm_chip, pwm); if (lpg == NULL) { dev_err(pwm_chip->dev, "lpg not found\n"); return; } rc = qpnp_lpg_pwm_src_enable(lpg, false); if (rc < 0) { dev_err(pwm_chip->dev, "Disable PWM output failed for channel %d, rc=%d\n", lpg->lpg_idx, rc); return; } rc = qpnp_lpg_set_glitch_removal(lpg, false); if (rc < 0) dev_err(lpg->chip->dev, "Disable glitch-removal failed, rc=%d\n", rc); } static int qpnp_lpg_pwm_output_types_supported(struct pwm_chip *pwm_chip, struct pwm_device *pwm) { enum pwm_output_type type = PWM_OUTPUT_FIXED; struct qpnp_lpg_channel *lpg; lpg = pwm_dev_to_qpnp_lpg(pwm_chip, pwm); if (lpg == NULL) { dev_err(pwm_chip->dev, "lpg not found\n"); return type; } if (lpg->chip->lut != NULL) type |= PWM_OUTPUT_MODULATED; return type; } #ifdef CONFIG_DEBUG_FS static void qpnp_lpg_pwm_dbg_show(struct pwm_chip *pwm_chip, struct seq_file *s) { struct qpnp_lpg_channel *lpg; struct lpg_pwm_config *cfg; struct lpg_ramp_config *ramp; struct pwm_device *pwm; int i, j; for (i = 0; i < pwm_chip->npwm; i++) { pwm = &pwm_chip->pwms[i]; lpg = pwm_dev_to_qpnp_lpg(pwm_chip, pwm); if (lpg == NULL) { dev_err(pwm_chip->dev, "lpg not found\n"); return; } if (test_bit(PWMF_REQUESTED, &pwm->flags)) { seq_printf(s, "LPG %d is requested by %s\n", lpg->lpg_idx + 1, pwm->label); } else { seq_printf(s, "LPG %d is free\n", lpg->lpg_idx + 1); continue; } if (pwm_is_enabled(pwm)) { seq_puts(s, " enabled\n"); } else { seq_puts(s, " disabled\n"); continue; } cfg = &lpg->pwm_config; seq_printf(s, " clk = %dHz\n", cfg->pwm_clk); seq_printf(s, " pwm_size = %d\n", cfg->pwm_size); seq_printf(s, " prediv = %d\n", cfg->prediv); seq_printf(s, " exponent = %d\n", cfg->clk_exp); seq_printf(s, " pwm_value = %d\n", cfg->pwm_value); seq_printf(s, " Requested period: %dns, best period = %dns\n", pwm_get_period(pwm), cfg->best_period_ns); ramp = &lpg->ramp_config; if (pwm_get_output_type(pwm) == PWM_OUTPUT_MODULATED) { seq_puts(s, " ramping duty percentages:"); for (j = 0; j < ramp->pattern_length; j++) seq_printf(s, " %d", ramp->pattern[j]); seq_puts(s, "\n"); seq_printf(s, " ramping time per step: %dms\n", ramp->step_ms); seq_printf(s, " ramping low index: %d\n", ramp->lo_idx); seq_printf(s, " ramping high index: %d\n", ramp->hi_idx); seq_printf(s, " ramping from low to high: %d\n", ramp->ramp_dir_low_to_hi); seq_printf(s, " ramping pattern repeat: %d\n", ramp->pattern_repeat); seq_printf(s, " ramping toggle: %d\n", ramp->toggle); seq_printf(s, " ramping pause count at low index: %d\n", ramp->pause_lo_count); seq_printf(s, " ramping pause count at high index: %d\n", ramp->pause_hi_count); } } } #endif static const struct pwm_ops qpnp_lpg_pwm_ops = { .config = qpnp_lpg_pwm_config, .get_output_type_supported = qpnp_lpg_pwm_output_types_supported, .set_output_type = qpnp_lpg_pwm_set_output_type, .set_output_pattern = qpnp_lpg_pwm_set_output_pattern, .enable = qpnp_lpg_pwm_enable, .disable = qpnp_lpg_pwm_disable, #ifdef CONFIG_DEBUG_FS .dbg_show = qpnp_lpg_pwm_dbg_show, #endif .owner = THIS_MODULE, }; static int qpnp_lpg_parse_dt(struct qpnp_lpg_chip *chip) { struct device_node *child; struct qpnp_lpg_channel *lpg; struct lpg_ramp_config *ramp; int rc = 0, i; u32 base, length, lpg_chan_id, tmp; const __be32 *addr; addr = of_get_address(chip->dev->of_node, 0, NULL, NULL); if (!addr) { dev_err(chip->dev, "Get %s address failed\n", LPG_BASE); return -EINVAL; } base = be32_to_cpu(addr[0]); length = be32_to_cpu(addr[1]); chip->num_lpgs = length / REG_SIZE_PER_LPG; chip->lpgs = devm_kcalloc(chip->dev, chip->num_lpgs, sizeof(*chip->lpgs), GFP_KERNEL); if (!chip->lpgs) return -ENOMEM; for (i = 0; i < chip->num_lpgs; i++) { chip->lpgs[i].chip = chip; chip->lpgs[i].lpg_idx = i; chip->lpgs[i].reg_base = base + i * REG_SIZE_PER_LPG; chip->lpgs[i].src_sel = PWM_VALUE; rc = qpnp_lpg_read(&chip->lpgs[i], REG_LPG_PERPH_SUBTYPE, &chip->lpgs[i].subtype); if (rc < 0) { dev_err(chip->dev, "Read subtype failed, rc=%d\n", rc); return rc; } } addr = of_get_address(chip->dev->of_node, 1, NULL, NULL); if (!addr) { pr_debug("NO LUT address assigned\n"); return 0; } chip->lut = devm_kmalloc(chip->dev, sizeof(*chip->lut), GFP_KERNEL); if (!chip->lut) return -ENOMEM; chip->lut->chip = chip; chip->lut->reg_base = be32_to_cpu(*addr); mutex_init(&chip->lut->lock); rc = of_property_count_elems_of_size(chip->dev->of_node, "qcom,lut-patterns", sizeof(u32)); if (rc < 0) { dev_err(chip->dev, "Read qcom,lut-patterns failed, rc=%d\n", rc); return rc; } length = rc; if (length > LPG_LUT_COUNT_MAX) { dev_err(chip->dev, "qcom,lut-patterns length %d exceed max %d\n", length, LPG_LUT_COUNT_MAX); return -EINVAL; } chip->lut->pattern = devm_kcalloc(chip->dev, LPG_LUT_COUNT_MAX, sizeof(*chip->lut->pattern), GFP_KERNEL); if (!chip->lut->pattern) return -ENOMEM; rc = of_property_read_u32_array(chip->dev->of_node, "qcom,lut-patterns", chip->lut->pattern, length); if (rc < 0) { dev_err(chip->dev, "Get qcom,lut-patterns failed, rc=%d\n", rc); return rc; } if (of_get_available_child_count(chip->dev->of_node) == 0) { dev_err(chip->dev, "No ramp configuration for any LPG\n"); return -EINVAL; } for_each_available_child_of_node(chip->dev->of_node, child) { rc = of_property_read_u32(child, "qcom,lpg-chan-id", &lpg_chan_id); if (rc < 0) { dev_err(chip->dev, "Get qcom,lpg-chan-id failed for node %s, rc=%d\n", child->name, rc); return rc; } if (lpg_chan_id > chip->num_lpgs) { dev_err(chip->dev, "lpg-chann-id %d is out of range 1~%d\n", lpg_chan_id, chip->num_lpgs); return -EINVAL; } /* lpg channel id is indexed from 1 in hardware */ lpg = &chip->lpgs[lpg_chan_id - 1]; ramp = &lpg->ramp_config; rc = of_property_read_u32(child, "qcom,ramp-step-ms", &tmp); if (rc < 0) { dev_err(chip->dev, "get qcom,ramp-step-ms failed for lpg%d, rc=%d\n", lpg_chan_id, rc); return rc; } ramp->step_ms = (u16)tmp; rc = of_property_read_u32(child, "qcom,ramp-low-index", &tmp); if (rc < 0) { dev_err(chip->dev, "get qcom,ramp-low-index failed for lpg%d, rc=%d\n", lpg_chan_id, rc); return rc; } ramp->lo_idx = (u8)tmp; if (ramp->lo_idx >= LPG_LUT_COUNT_MAX) { dev_err(chip->dev, "qcom,ramp-low-index should less than max %d\n", LPG_LUT_COUNT_MAX); return -EINVAL; } rc = of_property_read_u32(child, "qcom,ramp-high-index", &tmp); if (rc < 0) { dev_err(chip->dev, "get qcom,ramp-high-index failed for lpg%d, rc=%d\n", lpg_chan_id, rc); return rc; } ramp->hi_idx = (u8)tmp; if (ramp->hi_idx > LPG_LUT_COUNT_MAX) { dev_err(chip->dev, "qcom,ramp-high-index shouldn't exceed max %d\n", LPG_LUT_COUNT_MAX); return -EINVAL; } if (ramp->hi_idx <= ramp->lo_idx) { dev_err(chip->dev, "high-index(%d) should be larger than low-index(%d)\n", ramp->hi_idx, ramp->lo_idx); return -EINVAL; } ramp->pattern_length = ramp->hi_idx - ramp->lo_idx + 1; ramp->pattern = &chip->lut->pattern[ramp->lo_idx]; lpg->max_pattern_length = ramp->pattern_length; rc = of_property_read_u32(child, "qcom,ramp-pause-hi-count", &tmp); if (rc < 0) ramp->pause_hi_count = 0; else ramp->pause_hi_count = (u8)tmp; rc = of_property_read_u32(child, "qcom,ramp-pause-lo-count", &tmp); if (rc < 0) ramp->pause_lo_count = 0; else ramp->pause_lo_count = (u8)tmp; ramp->ramp_dir_low_to_hi = of_property_read_bool(child, "qcom,ramp-from-low-to-high"); ramp->pattern_repeat = of_property_read_bool(child, "qcom,ramp-pattern-repeat"); ramp->toggle = of_property_read_bool(child, "qcom,ramp-toggle"); } return 0; } static int qpnp_lpg_probe(struct platform_device *pdev) { int rc; struct qpnp_lpg_chip *chip; chip = devm_kzalloc(&pdev->dev, sizeof(*chip), GFP_KERNEL); if (!chip) return -ENOMEM; chip->dev = &pdev->dev; chip->regmap = dev_get_regmap(chip->dev->parent, NULL); if (!chip->regmap) { dev_err(chip->dev, "Getting regmap failed\n"); return -EINVAL; } mutex_init(&chip->bus_lock); rc = qpnp_lpg_parse_dt(chip); if (rc < 0) { dev_err(chip->dev, "Devicetree properties parsing failed, rc=%d\n", rc); goto err_out; } dev_set_drvdata(chip->dev, chip); chip->pwm_chip.dev = chip->dev; chip->pwm_chip.base = -1; chip->pwm_chip.npwm = chip->num_lpgs; chip->pwm_chip.ops = &qpnp_lpg_pwm_ops; rc = pwmchip_add(&chip->pwm_chip); if (rc < 0) { dev_err(chip->dev, "Add pwmchip failed, rc=%d\n", rc); goto err_out; } return 0; err_out: mutex_destroy(&chip->bus_lock); return rc; } static int qpnp_lpg_remove(struct platform_device *pdev) { struct qpnp_lpg_chip *chip = dev_get_drvdata(&pdev->dev); int rc = 0; rc = pwmchip_remove(&chip->pwm_chip); if (rc < 0) dev_err(chip->dev, "Remove pwmchip failed, rc=%d\n", rc); mutex_destroy(&chip->bus_lock); dev_set_drvdata(chip->dev, NULL); return rc; } static const struct of_device_id qpnp_lpg_of_match[] = { { .compatible = "qcom,pwm-lpg",}, { }, }; static struct platform_driver qpnp_lpg_driver = { .driver = { .name = "qcom,pwm-lpg", .of_match_table = qpnp_lpg_of_match, }, .probe = qpnp_lpg_probe, .remove = qpnp_lpg_remove, }; module_platform_driver(qpnp_lpg_driver); MODULE_DESCRIPTION("QTI LPG driver"); MODULE_LICENSE("GPL v2"); MODULE_ALIAS("pwm:pwm-lpg");