diff options
Diffstat (limited to 'drivers/pwm/pwm-fsl-ftm.c')
| -rw-r--r-- | drivers/pwm/pwm-fsl-ftm.c | 63 |
1 files changed, 40 insertions, 23 deletions
diff --git a/drivers/pwm/pwm-fsl-ftm.c b/drivers/pwm/pwm-fsl-ftm.c index c45a5fca4cbb..35406b2e1925 100644 --- a/drivers/pwm/pwm-fsl-ftm.c +++ b/drivers/pwm/pwm-fsl-ftm.c @@ -3,6 +3,7 @@ * Freescale FlexTimer Module (FTM) PWM Driver * * Copyright 2012-2013 Freescale Semiconductor, Inc. + * Copyright 2020-2025 NXP */ #include <linux/clk.h> @@ -10,7 +11,6 @@ #include <linux/io.h> #include <linux/kernel.h> #include <linux/module.h> -#include <linux/mutex.h> #include <linux/of.h> #include <linux/platform_device.h> #include <linux/pm.h> @@ -31,6 +31,8 @@ enum fsl_pwm_clk { struct fsl_ftm_soc { bool has_enable_bits; + bool has_flt_reg; + unsigned int npwm; }; struct fsl_pwm_periodcfg { @@ -40,7 +42,6 @@ struct fsl_pwm_periodcfg { }; struct fsl_pwm_chip { - struct mutex lock; struct regmap *regmap; /* This value is valid iff a pwm is running */ @@ -89,11 +90,8 @@ static int fsl_pwm_request(struct pwm_chip *chip, struct pwm_device *pwm) struct fsl_pwm_chip *fpc = to_fsl_chip(chip); ret = clk_prepare_enable(fpc->ipg_clk); - if (!ret && fpc->soc->has_enable_bits) { - mutex_lock(&fpc->lock); + if (!ret && fpc->soc->has_enable_bits) regmap_set_bits(fpc->regmap, FTM_SC, BIT(pwm->hwpwm + 16)); - mutex_unlock(&fpc->lock); - } return ret; } @@ -102,11 +100,8 @@ static void fsl_pwm_free(struct pwm_chip *chip, struct pwm_device *pwm) { struct fsl_pwm_chip *fpc = to_fsl_chip(chip); - if (fpc->soc->has_enable_bits) { - mutex_lock(&fpc->lock); + if (fpc->soc->has_enable_bits) regmap_clear_bits(fpc->regmap, FTM_SC, BIT(pwm->hwpwm + 16)); - mutex_unlock(&fpc->lock); - } clk_disable_unprepare(fpc->ipg_clk); } @@ -304,7 +299,7 @@ static int fsl_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm, { struct fsl_pwm_chip *fpc = to_fsl_chip(chip); struct pwm_state *oldstate = &pwm->state; - int ret = 0; + int ret; /* * oldstate to newstate : action @@ -315,8 +310,6 @@ static int fsl_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm, * disabled to enabled : update settings + enable */ - mutex_lock(&fpc->lock); - if (!newstate->enabled) { if (oldstate->enabled) { regmap_set_bits(fpc->regmap, FTM_OUTMASK, @@ -325,30 +318,28 @@ static int fsl_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm, clk_disable_unprepare(fpc->clk[fpc->period.clk_select]); } - goto end_mutex; + return 0; } ret = fsl_pwm_apply_config(chip, pwm, newstate); if (ret) - goto end_mutex; + return ret; /* check if need to enable */ if (!oldstate->enabled) { ret = clk_prepare_enable(fpc->clk[fpc->period.clk_select]); if (ret) - goto end_mutex; + return ret; ret = clk_prepare_enable(fpc->clk[FSL_PWM_CLK_CNTEN]); if (ret) { clk_disable_unprepare(fpc->clk[fpc->period.clk_select]); - goto end_mutex; + return ret; } regmap_clear_bits(fpc->regmap, FTM_OUTMASK, BIT(pwm->hwpwm)); } -end_mutex: - mutex_unlock(&fpc->lock); return ret; } @@ -386,6 +377,20 @@ static bool fsl_pwm_volatile_reg(struct device *dev, unsigned int reg) return false; } +static bool fsl_pwm_is_reg(struct device *dev, unsigned int reg) +{ + struct pwm_chip *chip = dev_get_drvdata(dev); + struct fsl_pwm_chip *fpc = to_fsl_chip(chip); + + if (reg >= FTM_CSC(fpc->soc->npwm) && reg < FTM_CNTIN) + return false; + + if ((reg == FTM_FLTCTRL || reg == FTM_FLTPOL) && !fpc->soc->has_flt_reg) + return false; + + return true; +} + static const struct regmap_config fsl_pwm_regmap_config = { .reg_bits = 32, .reg_stride = 4, @@ -394,23 +399,24 @@ static const struct regmap_config fsl_pwm_regmap_config = { .max_register = FTM_PWMLOAD, .volatile_reg = fsl_pwm_volatile_reg, .cache_type = REGCACHE_FLAT, + .writeable_reg = fsl_pwm_is_reg, + .readable_reg = fsl_pwm_is_reg, }; static int fsl_pwm_probe(struct platform_device *pdev) { + const struct fsl_ftm_soc *soc = of_device_get_match_data(&pdev->dev); struct pwm_chip *chip; struct fsl_pwm_chip *fpc; void __iomem *base; int ret; - chip = devm_pwmchip_alloc(&pdev->dev, 8, sizeof(*fpc)); + chip = devm_pwmchip_alloc(&pdev->dev, soc->npwm, sizeof(*fpc)); if (IS_ERR(chip)) return PTR_ERR(chip); fpc = to_fsl_chip(chip); - mutex_init(&fpc->lock); - - fpc->soc = of_device_get_match_data(&pdev->dev); + fpc->soc = soc; base = devm_platform_ioremap_resource(pdev, 0); if (IS_ERR(base)) @@ -526,15 +532,26 @@ static const struct dev_pm_ops fsl_pwm_pm_ops = { static const struct fsl_ftm_soc vf610_ftm_pwm = { .has_enable_bits = false, + .has_flt_reg = true, + .npwm = 8, }; static const struct fsl_ftm_soc imx8qm_ftm_pwm = { .has_enable_bits = true, + .has_flt_reg = true, + .npwm = 8, +}; + +static const struct fsl_ftm_soc s32g2_ftm_pwm = { + .has_enable_bits = true, + .has_flt_reg = false, + .npwm = 6, }; static const struct of_device_id fsl_pwm_dt_ids[] = { { .compatible = "fsl,vf610-ftm-pwm", .data = &vf610_ftm_pwm }, { .compatible = "fsl,imx8qm-ftm-pwm", .data = &imx8qm_ftm_pwm }, + { .compatible = "nxp,s32g2-ftm-pwm", .data = &s32g2_ftm_pwm }, { /* sentinel */ } }; MODULE_DEVICE_TABLE(of, fsl_pwm_dt_ids); |