We used to enable/disable the pwm only by switching the clock on or off. Instead, use the dedicated register bits. These differ on different SoCs, so introduce a SoC specific function for this.
Signed-off-by: Sascha Hauer <s.ha...@pengutronix.de> --- drivers/pwm/pwm-imx.c | 48 ++++++++++++++++++++++++++++++++++++++++++++---- 1 file changed, 44 insertions(+), 4 deletions(-) diff --git a/drivers/pwm/pwm-imx.c b/drivers/pwm/pwm-imx.c index 0f244e6..3fc4ae8 100644 --- a/drivers/pwm/pwm-imx.c +++ b/drivers/pwm/pwm-imx.c @@ -25,6 +25,7 @@ #define MX1_PWMS 0x04 /* PWM Sample Register */ #define MX1_PWMP 0x08 /* PWM Period Register */ +#define MX1_PWMC_EN (1 << 4) /* i.MX27, i.MX31, i.MX35 share the same PWM function block: */ @@ -49,6 +50,7 @@ struct imx_chip { int (*config)(struct pwm_chip *chip, struct pwm_device *pwm, int duty_ns, int period_ns); + void (*set_enable)(struct pwm_chip *chip, bool enable); }; #define to_imx_chip(chip) container_of(chip, struct imx_chip, chip) @@ -81,6 +83,21 @@ static int imx_pwm_config_v1(struct pwm_chip *chip, return 0; } +static void imx_pwm_set_enable_v1(struct pwm_chip *chip, bool enable) +{ + struct imx_chip *imx = to_imx_chip(chip); + u32 val; + + val = readl(imx->mmio_base + MX1_PWMC); + + if (enable) + val |= MX1_PWMC_EN; + else + val &= ~MX1_PWMC_EN; + + writel(val, imx->mmio_base + MX1_PWMC); +} + static int imx_pwm_config_v2(struct pwm_chip *chip, struct pwm_device *pwm, int duty_ns, int period_ns) { @@ -115,7 +132,10 @@ static int imx_pwm_config_v2(struct pwm_chip *chip, cr = MX3_PWMCR_PRESCALER(prescale) | MX3_PWMCR_DOZEEN | MX3_PWMCR_WAITEN | - MX3_PWMCR_DBGEN | MX3_PWMCR_EN; + MX3_PWMCR_DBGEN; + + if (imx->enabled) + cr |= MX3_PWMCR_EN; if (cpu_is_mx25()) cr |= MX3_PWMCR_CLKSRC_IPG; @@ -127,6 +147,21 @@ static int imx_pwm_config_v2(struct pwm_chip *chip, return 0; } +static void imx_pwm_set_enable_v2(struct pwm_chip *chip, bool enable) +{ + struct imx_chip *imx = to_imx_chip(chip); + u32 val; + + val = readl(imx->mmio_base + MX3_PWMCR); + + if (enable) + val |= MX3_PWMCR_EN; + else + val &= ~MX3_PWMCR_EN; + + writel(val, imx->mmio_base + MX3_PWMCR); +} + static int imx_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm, int duty_ns, int period_ns) { @@ -144,6 +179,8 @@ static int imx_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm) if (rc) return rc; + imx->set_enable(chip, true); + imx->enabled = 1; return 0; @@ -153,7 +190,7 @@ static void imx_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm) { struct imx_chip *imx = to_imx_chip(chip); - writel(0, imx->mmio_base + MX3_PWMCR); + imx->set_enable(chip, false); clk_disable_unprepare(imx->clk); imx->enabled = 0; @@ -198,10 +235,13 @@ static int __devinit imx_pwm_probe(struct platform_device *pdev) if (imx->mmio_base == NULL) return -EADDRNOTAVAIL; - if (cpu_is_mx1() || cpu_is_mx21()) + if (cpu_is_mx1() || cpu_is_mx21()) { imx->config = imx_pwm_config_v1; - else + imx->set_enable = imx_pwm_set_enable_v1; + } else { imx->config = imx_pwm_config_v2; + imx->set_enable = imx_pwm_set_enable_v2; + } ret = pwmchip_add(&imx->chip); if (ret < 0) -- 1.7.10.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/