diff options
Diffstat (limited to 'drivers/pwm/pwm-imx.c')
| -rw-r--r-- | drivers/pwm/pwm-imx.c | 155 |
1 files changed, 141 insertions, 14 deletions
diff --git a/drivers/pwm/pwm-imx.c b/drivers/pwm/pwm-imx.c index 2008c1520e6..9b8a8c189d0 100644 --- a/drivers/pwm/pwm-imx.c +++ b/drivers/pwm/pwm-imx.c @@ -13,18 +13,7 @@ #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) -{ - struct pwm_regs *pwm = (struct pwm_regs *)pwm_id_to_reg(pwm_id); - - if (!pwm) - return -1; - - writel(0, &pwm->ir); - return 0; -} +#include <clk.h> int pwm_config_internal(struct pwm_regs *pwm, unsigned long period_cycles, unsigned long duty_cycles, unsigned long prescale) @@ -44,6 +33,84 @@ int pwm_config_internal(struct pwm_regs *pwm, unsigned long period_cycles, return 0; } +#ifndef CONFIG_DM_PWM +/* 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_init(int pwm_id, int div, int invert) +{ + struct pwm_regs *pwm = (struct pwm_regs *)pwm_id_to_reg(pwm_id); + + if (!pwm) + return -1; + + writel(0, &pwm->ir); + 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); @@ -79,12 +146,44 @@ void pwm_disable(int pwm_id) clrbits_le32(&pwm->cr, PWMCR_EN); } -#if defined(CONFIG_DM_PWM) +#else struct imx_pwm_priv { struct pwm_regs *regs; bool invert; + struct clk per_clk; + struct clk ipg_clk; }; +int pwm_dm_imx_get_parms(struct imx_pwm_priv *priv, int period_ns, + int duty_ns, unsigned long *period_c, unsigned long *duty_c, + unsigned long *prescale) +{ + unsigned long long c; + + c = clk_get_rate(&priv->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; +} + static int imx_pwm_set_invert(struct udevice *dev, uint channel, bool polarity) { @@ -105,7 +204,7 @@ static int imx_pwm_set_config(struct udevice *dev, uint channel, debug("%s: Config '%s' channel: %d\n", __func__, dev->name, channel); - pwm_imx_get_parms(period_ns, duty_ns, &period_cycles, &duty_cycles, + pwm_dm_imx_get_parms(priv, period_ns, duty_ns, &period_cycles, &duty_cycles, &prescale); return pwm_config_internal(regs, period_cycles, duty_cycles, prescale); @@ -128,15 +227,43 @@ static int imx_pwm_set_enable(struct udevice *dev, uint channel, bool enable) static int imx_pwm_of_to_plat(struct udevice *dev) { + int ret; struct imx_pwm_priv *priv = dev_get_priv(dev); priv->regs = dev_read_addr_ptr(dev); + ret = clk_get_by_name(dev, "per", &priv->per_clk); + if (ret) { + printf("Failed to get per_clk\n"); + return ret; + } + + ret = clk_get_by_name(dev, "ipg", &priv->ipg_clk); + if (ret) { + printf("Failed to get ipg_clk\n"); + return ret; + } + return 0; } static int imx_pwm_probe(struct udevice *dev) { + int ret; + struct imx_pwm_priv *priv = dev_get_priv(dev); + + ret = clk_enable(&priv->per_clk); + if (ret) { + printf("Failed to enable per_clk\n"); + return ret; + } + + ret = clk_enable(&priv->ipg_clk); + if (ret) { + printf("Failed to enable ipg_clk\n"); + return ret; + } + return 0; } |