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mxc pwm: add mx25 support

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Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
This commit is contained in:
Sascha Hauer 2009-06-19 11:08:07 +02:00
parent 6134b2cbb0
commit a058cbc179
1 changed files with 13 additions and 4 deletions
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17
arch/arm/plat-mxc/pwm.c
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@ -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) |
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