diff options
Diffstat (limited to 'arch/arm/plat-mxc/pwm.c')
| -rw-r--r-- | arch/arm/plat-mxc/pwm.c | 19 |
1 files changed, 15 insertions, 4 deletions
diff --git a/arch/arm/plat-mxc/pwm.c b/arch/arm/plat-mxc/pwm.c index ae34198a79d..5cdbd605ac0 100644 --- a/arch/arm/plat-mxc/pwm.c +++ b/arch/arm/plat-mxc/pwm.c @@ -32,6 +32,7 @@ #define MX3_PWMPR 0x10 /* PWM Period Register */ #define MX3_PWMCR_PRESCALER(x) (((x - 1) & 0xFFF) << 4) #define MX3_PWMCR_CLKSRC_IPG_HIGH (2 << 16) +#define MX3_PWMCR_CLKSRC_IPG (1 << 16) #define MX3_PWMCR_EN (1 << 0) @@ -55,9 +56,11 @@ int pwm_config(struct pwm_device *pwm, int duty_ns, int period_ns) if (pwm == NULL || period_ns == 0 || duty_ns > period_ns) return -EINVAL; - if (cpu_is_mx27() || cpu_is_mx3()) { + if (cpu_is_mx27() || cpu_is_mx3() || cpu_is_mx25()) { unsigned long long c; unsigned long period_cycles, duty_cycles, prescale; + u32 cr; + c = clk_get_rate(pwm->clk); c = c * period_ns; do_div(c, 1000000000); @@ -72,9 +75,15 @@ int pwm_config(struct pwm_device *pwm, int duty_ns, int period_ns) writel(duty_cycles, pwm->mmio_base + MX3_PWMSAR); writel(period_cycles, pwm->mmio_base + MX3_PWMPR); - writel(MX3_PWMCR_PRESCALER(prescale - 1) | - MX3_PWMCR_CLKSRC_IPG_HIGH | MX3_PWMCR_EN, - pwm->mmio_base + MX3_PWMCR); + + cr = MX3_PWMCR_PRESCALER(prescale) | MX3_PWMCR_EN; + + if (cpu_is_mx25()) + cr |= MX3_PWMCR_CLKSRC_IPG; + else + cr |= MX3_PWMCR_CLKSRC_IPG_HIGH; + + writel(cr, pwm->mmio_base + MX3_PWMCR); } else if (cpu_is_mx1() || cpu_is_mx21()) { /* The PWM subsystem allows for exact frequencies. However, * I cannot connect a scope on my device to the PWM line and @@ -118,6 +127,8 @@ EXPORT_SYMBOL(pwm_enable); void pwm_disable(struct pwm_device *pwm) { + writel(0, pwm->mmio_base + MX3_PWMCR); + if (pwm->clk_enabled) { clk_disable(pwm->clk); pwm->clk_enabled = 0; |