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authorPhilip, Avinash <avinashphilip@ti.com>2012-09-06 01:10:02 -0400
committerThierry Reding <thierry.reding@avionic-design.de>2012-09-10 11:05:52 -0400
commit454870a44b0687675180506b7774fb559d610675 (patch)
tree4ce95213a641f5911350a1a085e5fc1cee9c477b /drivers/pwm
parent6354316dbe5a13b25bea15d7ffc891be025eb267 (diff)
pwm: pwm-tiecap: Add support for configuring polarity of PWM
ECAP APWM hardware supports polarity configuration of PWM output. This commit adds support for polarity configuration of ECAP APWM. Signed-off-by: Philip, Avinash <avinashphilip@ti.com> Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
Diffstat (limited to 'drivers/pwm')
-rw-r--r--drivers/pwm/pwm-tiecap.c22
1 files changed, 22 insertions, 0 deletions
diff --git a/drivers/pwm/pwm-tiecap.c b/drivers/pwm/pwm-tiecap.c
index 4b6688909fee..081471fbb097 100644
--- a/drivers/pwm/pwm-tiecap.c
+++ b/drivers/pwm/pwm-tiecap.c
@@ -32,6 +32,7 @@
32#define CAP3 0x10 32#define CAP3 0x10
33#define CAP4 0x14 33#define CAP4 0x14
34#define ECCTL2 0x2A 34#define ECCTL2 0x2A
35#define ECCTL2_APWM_POL_LOW BIT(10)
35#define ECCTL2_APWM_MODE BIT(9) 36#define ECCTL2_APWM_MODE BIT(9)
36#define ECCTL2_SYNC_SEL_DISA (BIT(7) | BIT(6)) 37#define ECCTL2_SYNC_SEL_DISA (BIT(7) | BIT(6))
37#define ECCTL2_TSCTR_FREERUN BIT(4) 38#define ECCTL2_TSCTR_FREERUN BIT(4)
@@ -111,6 +112,26 @@ static int ecap_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
111 return 0; 112 return 0;
112} 113}
113 114
115static int ecap_pwm_set_polarity(struct pwm_chip *chip, struct pwm_device *pwm,
116 enum pwm_polarity polarity)
117{
118 struct ecap_pwm_chip *pc = to_ecap_pwm_chip(chip);
119 unsigned short reg_val;
120
121 pm_runtime_get_sync(pc->chip.dev);
122 reg_val = readw(pc->mmio_base + ECCTL2);
123 if (polarity == PWM_POLARITY_INVERSED)
124 /* Duty cycle defines LOW period of PWM */
125 reg_val |= ECCTL2_APWM_POL_LOW;
126 else
127 /* Duty cycle defines HIGH period of PWM */
128 reg_val &= ~ECCTL2_APWM_POL_LOW;
129
130 writew(reg_val, pc->mmio_base + ECCTL2);
131 pm_runtime_put_sync(pc->chip.dev);
132 return 0;
133}
134
114static int ecap_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm) 135static int ecap_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
115{ 136{
116 struct ecap_pwm_chip *pc = to_ecap_pwm_chip(chip); 137 struct ecap_pwm_chip *pc = to_ecap_pwm_chip(chip);
@@ -157,6 +178,7 @@ static void ecap_pwm_free(struct pwm_chip *chip, struct pwm_device *pwm)
157static const struct pwm_ops ecap_pwm_ops = { 178static const struct pwm_ops ecap_pwm_ops = {
158 .free = ecap_pwm_free, 179 .free = ecap_pwm_free,
159 .config = ecap_pwm_config, 180 .config = ecap_pwm_config,
181 .set_polarity = ecap_pwm_set_polarity,
160 .enable = ecap_pwm_enable, 182 .enable = ecap_pwm_enable,
161 .disable = ecap_pwm_disable, 183 .disable = ecap_pwm_disable,
162 .owner = THIS_MODULE, 184 .owner = THIS_MODULE,