#include <linux/slab.h>
#include <linux/time.h>
-#define STI_DS_REG(ch) (4 * (ch)) /* Channel's Duty Cycle register */
-#define STI_PWMCR 0x50 /* Control/Config register */
-#define STI_INTEN 0x54 /* Interrupt Enable/Disable register */
+#define PWM_OUT_VAL(x) (0x00 + (4 * (x))) /* Device's Duty Cycle register */
+
+#define STI_PWM_CTRL 0x50 /* Control/Config register */
+#define STI_INT_EN 0x54 /* Interrupt Enable/Disable register */
#define PWM_PRESCALE_LOW_MASK 0x0f
#define PWM_PRESCALE_HIGH_MASK 0xf0
/* Regfield IDs */
enum {
+ /* Bits in PWM_CTRL*/
PWMCLK_PRESCALE_LOW,
PWMCLK_PRESCALE_HIGH,
- PWM_EN,
- PWM_INT_EN,
+
+ PWM_OUT_EN,
+
+ PWM_CPT_INT_EN,
/* Keep last */
MAX_REGFIELDS
struct sti_pwm_compat_data {
const struct reg_field *reg_fields;
- unsigned int num_chan;
+ unsigned int num_devs;
unsigned int max_pwm_cnt;
unsigned int max_prescale;
};
struct sti_pwm_chip {
struct device *dev;
- struct clk *clk;
unsigned long clk_rate;
+ struct clk *pwm_clk;
struct regmap *regmap;
struct sti_pwm_compat_data *cdata;
struct regmap_field *prescale_low;
struct regmap_field *prescale_high;
- struct regmap_field *pwm_en;
- struct regmap_field *pwm_int_en;
+ struct regmap_field *pwm_out_en;
+ struct regmap_field *pwm_cpt_int_en;
struct pwm_chip chip;
struct pwm_device *cur;
unsigned long configured;
};
static const struct reg_field sti_pwm_regfields[MAX_REGFIELDS] = {
- [PWMCLK_PRESCALE_LOW] = REG_FIELD(STI_PWMCR, 0, 3),
- [PWMCLK_PRESCALE_HIGH] = REG_FIELD(STI_PWMCR, 11, 14),
- [PWM_EN] = REG_FIELD(STI_PWMCR, 9, 9),
- [PWM_INT_EN] = REG_FIELD(STI_INTEN, 0, 0),
+ [PWMCLK_PRESCALE_LOW] = REG_FIELD(STI_PWM_CTRL, 0, 3),
+ [PWMCLK_PRESCALE_HIGH] = REG_FIELD(STI_PWM_CTRL, 11, 14),
+ [PWM_OUT_EN] = REG_FIELD(STI_PWM_CTRL, 9, 9),
+ [PWM_CPT_INT_EN] = REG_FIELD(STI_INT_EN, 1, 4),
};
static inline struct sti_pwm_chip *to_sti_pwmchip(struct pwm_chip *chip)
/* Allow configuration changes if one of the
* following conditions satisfy.
- * 1. No channels have been configured.
- * 2. Only one channel has been configured and the new request
- * is for the same channel.
- * 3. Only one channel has been configured and the new request is
- * for a new channel and period of the new channel is same as
+ * 1. No devices have been configured.
+ * 2. Only one device has been configured and the new request
+ * is for the same device.
+ * 3. Only one device has been configured and the new request is
+ * for a new device and period of the new device is same as
* the current configured period.
- * 4. More than one channels are configured and period of the new
+ * 4. More than one devices are configured and period of the new
* requestis the same as the current period.
*/
if (!ncfg ||
((ncfg == 1) && (pwm->hwpwm != cur->hwpwm) && period_same) ||
((ncfg > 1) && period_same)) {
/* Enable clock before writing to PWM registers. */
- ret = clk_enable(pc->clk);
+ ret = clk_enable(pc->pwm_clk);
if (ret)
return ret;
*/
pwmvalx = cdata->max_pwm_cnt * duty_ns / period_ns;
- ret = regmap_write(pc->regmap, STI_DS_REG(pwm->hwpwm), pwmvalx);
+ ret = regmap_write(pc->regmap,
+ PWM_OUT_VAL(pwm->hwpwm), pwmvalx);
if (ret)
goto clk_dis;
- ret = regmap_field_write(pc->pwm_int_en, 0);
+ ret = regmap_field_write(pc->pwm_cpt_int_en, 0);
set_bit(pwm->hwpwm, &pc->configured);
pc->cur = pwm;
}
clk_dis:
- clk_disable(pc->clk);
+ clk_disable(pc->pwm_clk);
return ret;
}
int ret = 0;
/*
- * Since we have a common enable for all PWM channels,
+ * Since we have a common enable for all PWM devices,
* do not enable if already enabled.
*/
mutex_lock(&pc->sti_pwm_lock);
if (!pc->en_count) {
- ret = clk_enable(pc->clk);
+ ret = clk_enable(pc->pwm_clk);
if (ret)
goto out;
- ret = regmap_field_write(pc->pwm_en, 1);
+ ret = regmap_field_write(pc->pwm_out_en, 1);
if (ret) {
dev_err(dev, "failed to enable PWM device:%d\n",
pwm->hwpwm);
mutex_unlock(&pc->sti_pwm_lock);
return;
}
- regmap_field_write(pc->pwm_en, 0);
+ regmap_field_write(pc->pwm_out_en, 0);
- clk_disable(pc->clk);
+ clk_disable(pc->pwm_clk);
mutex_unlock(&pc->sti_pwm_lock);
}
const struct reg_field *reg_fields;
struct device_node *np = dev->of_node;
struct sti_pwm_compat_data *cdata = pc->cdata;
- u32 num_chan;
+ u32 num_devs;
- of_property_read_u32(np, "st,pwm-num-chan", &num_chan);
- if (num_chan)
- cdata->num_chan = num_chan;
+ of_property_read_u32(np, "st,pwm-num-chan", &num_devs);
+ if (num_devs)
+ cdata->num_devs = num_devs;
reg_fields = cdata->reg_fields;
if (IS_ERR(pc->prescale_high))
return PTR_ERR(pc->prescale_high);
- pc->pwm_en = devm_regmap_field_alloc(dev, pc->regmap,
- reg_fields[PWM_EN]);
- if (IS_ERR(pc->pwm_en))
- return PTR_ERR(pc->pwm_en);
- pc->pwm_int_en = devm_regmap_field_alloc(dev, pc->regmap,
- reg_fields[PWM_INT_EN]);
- if (IS_ERR(pc->pwm_int_en))
- return PTR_ERR(pc->pwm_int_en);
+ pc->pwm_out_en = devm_regmap_field_alloc(dev, pc->regmap,
+ reg_fields[PWM_OUT_EN]);
+ if (IS_ERR(pc->pwm_out_en))
+ return PTR_ERR(pc->pwm_out_en);
+
+ pc->pwm_cpt_int_en = devm_regmap_field_alloc(dev, pc->regmap,
+ reg_fields[PWM_CPT_INT_EN]);
+ if (IS_ERR(pc->pwm_cpt_int_en))
+ return PTR_ERR(pc->pwm_cpt_int_en);
return 0;
}
cdata->reg_fields = &sti_pwm_regfields[0];
cdata->max_prescale = 0xff;
cdata->max_pwm_cnt = 255;
- cdata->num_chan = 1;
+ cdata->num_devs = 1;
pc->cdata = cdata;
pc->dev = dev;
if (ret)
return ret;
- pc->clk = of_clk_get_by_name(dev->of_node, "pwm");
- if (IS_ERR(pc->clk)) {
+ pc->pwm_clk = of_clk_get_by_name(dev->of_node, "pwm");
+ if (IS_ERR(pc->pwm_clk)) {
dev_err(dev, "failed to get PWM clock\n");
- return PTR_ERR(pc->clk);
+ return PTR_ERR(pc->pwm_clk);
}
- pc->clk_rate = clk_get_rate(pc->clk);
+ pc->clk_rate = clk_get_rate(pc->pwm_clk);
if (!pc->clk_rate) {
dev_err(dev, "failed to get clock rate\n");
return -EINVAL;
}
- ret = clk_prepare(pc->clk);
+ ret = clk_prepare(pc->pwm_clk);
if (ret) {
dev_err(dev, "failed to prepare clock\n");
return ret;
pc->chip.dev = dev;
pc->chip.ops = &sti_pwm_ops;
pc->chip.base = -1;
- pc->chip.npwm = pc->cdata->num_chan;
+ pc->chip.npwm = pc->cdata->num_devs;
pc->chip.can_sleep = true;
ret = pwmchip_add(&pc->chip);
if (ret < 0) {
- clk_unprepare(pc->clk);
+ clk_unprepare(pc->pwm_clk);
return ret;
}
struct sti_pwm_chip *pc = platform_get_drvdata(pdev);
unsigned int i;
- for (i = 0; i < pc->cdata->num_chan; i++)
+ for (i = 0; i < pc->cdata->num_devs; i++)
pwm_disable(&pc->chip.pwms[i]);
- clk_unprepare(pc->clk);
+ clk_unprepare(pc->pwm_clk);
return pwmchip_remove(&pc->chip);
}
projects / cascardo / linux.git / blobdiff