diff options
Diffstat (limited to 'drivers/pwm/pwm-imx.c')
| -rw-r--r-- | drivers/pwm/pwm-imx.c | 67 |
1 files changed, 66 insertions, 1 deletions
diff --git a/drivers/pwm/pwm-imx.c b/drivers/pwm/pwm-imx.c index ce1290aa7d..1d656e726f 100644 --- a/drivers/pwm/pwm-imx.c +++ b/drivers/pwm/pwm-imx.c @@ -13,7 +13,6 @@ #include <pwm.h> #include <asm/arch/imx-regs.h> #include <asm/io.h> -#include "pwm-imx-util.h" int pwm_init(int pwm_id, int div, int invert) { @@ -45,6 +44,72 @@ int pwm_config_internal(struct pwm_regs *pwm, unsigned long period_cycles, return 0; } +/* pwm_id from 0..7 */ +struct pwm_regs *pwm_id_to_reg(int pwm_id) +{ + + switch (pwm_id) { + case 0: + return (struct pwm_regs *)PWM1_BASE_ADDR; + case 1: + return (struct pwm_regs *)PWM2_BASE_ADDR; +#ifdef CONFIG_MX6 + case 2: + return (struct pwm_regs *)PWM3_BASE_ADDR; + case 3: + return (struct pwm_regs *)PWM4_BASE_ADDR; +#endif +#ifdef CONFIG_MX6SX + case 4: + return (struct pwm_regs *)PWM5_BASE_ADDR; + case 5: + return (struct pwm_regs *)PWM6_BASE_ADDR; + case 6: + return (struct pwm_regs *)PWM7_BASE_ADDR; + case 7: + return (struct pwm_regs *)PWM8_BASE_ADDR; +#endif + default: + printf("unknown pwm_id: %d\n", pwm_id); + break; + } + return NULL; +} + +int pwm_imx_get_parms(int period_ns, int duty_ns, unsigned long *period_c, + unsigned long *duty_c, unsigned long *prescale) +{ + unsigned long long c; + + /* + * we have not yet a clock framework for imx6, so add the clock + * value here as a define. Replace it when we have the clock + * framework. + */ + c = CONFIG_IMX6_PWM_PER_CLK; + c = c * period_ns; + do_div(c, 1000000000); + *period_c = c; + + *prescale = *period_c / 0x10000 + 1; + + *period_c /= *prescale; + c = *period_c * (unsigned long long)duty_ns; + do_div(c, period_ns); + *duty_c = c; + + /* + * according to imx pwm RM, the real period value should be + * PERIOD value in PWMPR plus 2. + */ + if (*period_c > 2) + *period_c -= 2; + else + *period_c = 0; + + return 0; +} + int pwm_config(int pwm_id, int duty_ns, int period_ns) { struct pwm_regs *pwm = (struct pwm_regs *)pwm_id_to_reg(pwm_id); |