diff options
Diffstat (limited to 'include/linux/atmel_pwm.h')
| -rw-r--r-- | include/linux/atmel_pwm.h | 70 | 
1 files changed, 0 insertions, 70 deletions
| diff --git a/include/linux/atmel_pwm.h b/include/linux/atmel_pwm.h deleted file mode 100644 index ea04abb3db8e..000000000000 --- a/include/linux/atmel_pwm.h +++ /dev/null @@ -1,70 +0,0 @@ -#ifndef __LINUX_ATMEL_PWM_H -#define __LINUX_ATMEL_PWM_H - -/** - * struct pwm_channel - driver handle to a PWM channel - * @regs: base of this channel's registers - * @index: number of this channel (0..31) - * @mck: base clock rate, which can be prescaled and maybe subdivided - * - * Drivers initialize a pwm_channel structure using pwm_channel_alloc(). - * Then they configure its clock rate (derived from MCK), alignment, - * polarity, and duty cycle by writing directly to the channel registers, - * before enabling the channel by calling pwm_channel_enable(). - * - * After emitting a PWM signal for the desired length of time, drivers - * may then pwm_channel_disable() or pwm_channel_free().  Both of these - * disable the channel, but when it's freed the IRQ is deconfigured and - * the channel must later be re-allocated and reconfigured. - * - * Note that if the period or duty cycle need to be changed while the - * PWM channel is operating, drivers must use the PWM_CUPD double buffer - * mechanism, either polling until they change or getting implicitly - * notified through a once-per-period interrupt handler. - */ -struct pwm_channel { -	void __iomem	*regs; -	unsigned	index; -	unsigned long	mck; -}; - -extern int pwm_channel_alloc(int index, struct pwm_channel *ch); -extern int pwm_channel_free(struct pwm_channel *ch); - -extern int pwm_clk_alloc(unsigned prescale, unsigned div); -extern void pwm_clk_free(unsigned clk); - -extern int __pwm_channel_onoff(struct pwm_channel *ch, int enabled); - -#define pwm_channel_enable(ch)	__pwm_channel_onoff((ch), 1) -#define pwm_channel_disable(ch)	__pwm_channel_onoff((ch), 0) - -/* periodic interrupts, mostly for CUPD changes to period or cycle */ -extern int pwm_channel_handler(struct pwm_channel *ch, -		void (*handler)(struct pwm_channel *ch)); - -/* per-channel registers (banked at pwm_channel->regs) */ -#define PWM_CMR		0x00		/* mode register */ -#define		PWM_CPR_CPD	(1 << 10)	/* set: CUPD modifies period */ -#define		PWM_CPR_CPOL	(1 << 9)	/* set: idle high */ -#define		PWM_CPR_CALG	(1 << 8)	/* set: center align */ -#define		PWM_CPR_CPRE	(0xf << 0)	/* mask: rate is mck/(2^pre) */ -#define		PWM_CPR_CLKA	(0xb << 0)	/* rate CLKA */ -#define		PWM_CPR_CLKB	(0xc << 0)	/* rate CLKB */ -#define PWM_CDTY	0x04		/* duty cycle (max of CPRD) */ -#define PWM_CPRD	0x08		/* period (count up from zero) */ -#define PWM_CCNT	0x0c		/* counter (20 bits?) */ -#define PWM_CUPD	0x10		/* update CPRD (or CDTY) next period */ - -static inline void -pwm_channel_writel(struct pwm_channel *pwmc, unsigned offset, u32 val) -{ -	__raw_writel(val, pwmc->regs + offset); -} - -static inline u32 pwm_channel_readl(struct pwm_channel *pwmc, unsigned offset) -{ -	return __raw_readl(pwmc->regs + offset); -} - -#endif /* __LINUX_ATMEL_PWM_H */ | 
