Commit f66d78fa authored by Lee Jones's avatar Lee Jones Committed by Thierry Reding
Browse files

pwm: sti: Supply PWM capture register addresses and bit locations 



This is in preparation for subsequent patches that add support for PWM
capture to this driver.

Signed-off-by: default avatarLee Jones <lee.jones@linaro.org>
Signed-off-by: default avatarThierry Reding <thierry.reding@gmail.com>
parent d81738b7

drivers/pwm/pwm-sti.c

+25 −0
Original line number Diff line number Diff line
@@ -22,26 +22,48 @@ 
#include <linux/time.h>



#define PWM_OUT_VAL(x)	(0x00 + (4 * (x))) /* Device's Duty Cycle register */

#define PWM_CPT_VAL(x)	(0x10 + (4 * (x))) /* Capture value */

#define PWM_CPT_EDGE(x) (0x30 + (4 * (x))) /* Edge to capture on */



#define STI_PWM_CTRL		0x50	/* Control/Config register */

#define STI_INT_EN		0x54	/* Interrupt Enable/Disable register */

#define STI_INT_STA		0x58	/* Interrupt Status register */

#define PWM_INT_ACK			0x5c

#define PWM_PRESCALE_LOW_MASK		0x0f

#define PWM_PRESCALE_HIGH_MASK		0xf0

#define PWM_CPT_EDGE_MASK		0x03

#define PWM_INT_ACK_MASK		0x1ff



#define STI_MAX_CPT_DEVS		4

#define CPT_DC_MAX			0xff



/* Regfield IDs */

enum {

	/* Bits in PWM_CTRL*/

	PWMCLK_PRESCALE_LOW,

	PWMCLK_PRESCALE_HIGH,

	CPTCLK_PRESCALE,



	PWM_OUT_EN,

	PWM_CPT_EN,



	PWM_CPT_INT_EN,

	PWM_CPT_INT_STAT,



	/* Keep last */

	MAX_REGFIELDS

};



/* Each capture input can be programmed to detect rising-edge, falling-edge,

 * either edge or neither egde

 */

enum sti_cpt_edge {

	CPT_EDGE_DISABLED,

	CPT_EDGE_RISING,

	CPT_EDGE_FALLING,

	CPT_EDGE_BOTH,

};



struct sti_pwm_compat_data {

	const struct reg_field *reg_fields;

	unsigned int num_devs;
@@ -69,8 +91,11 @@ struct sti_pwm_chip { 
static const struct reg_field sti_pwm_regfields[MAX_REGFIELDS] = {

	[PWMCLK_PRESCALE_LOW]	= REG_FIELD(STI_PWM_CTRL, 0, 3),

	[PWMCLK_PRESCALE_HIGH]	= REG_FIELD(STI_PWM_CTRL, 11, 14),

	[CPTCLK_PRESCALE]	= REG_FIELD(STI_PWM_CTRL, 4, 8),

	[PWM_OUT_EN]		= REG_FIELD(STI_PWM_CTRL, 9, 9),

	[PWM_CPT_EN]		= REG_FIELD(STI_PWM_CTRL, 10, 10),

	[PWM_CPT_INT_EN]	= REG_FIELD(STI_INT_EN, 1, 4),

	[PWM_CPT_INT_STAT]	= REG_FIELD(STI_INT_STA, 1, 4),

};



static inline struct sti_pwm_chip *to_sti_pwmchip(struct pwm_chip *chip)