Re: [PATCH v2] clocksource/drivers/tcb_clksrc: make IO endian agnostic

[Nicolas Ferre]

Le 17/06/2017 Ã 13:35, Alexandre Belloni a Ãcrit :
> Now that AVR32 is gone, we can use the proper IO accessors that are
> correctly handling endianness.
> 
> Signed-off-by: Alexandre Belloni <alexandre.belloni@xxxxxxxxxxxxxxxxxx>

Acked-by: Nicolas Ferre <nicolas.ferre@xxxxxxxxxxxxx>
Thanks!

> ---
> Changes in v2:
>  - Also use the _relaxed version in tc_next_event as this is working fine.
> 
>  drivers/clocksource/tcb_clksrc.c | 58 ++++++++++++++++++++--------------------
>  1 file changed, 29 insertions(+), 29 deletions(-)
> 
> diff --git a/drivers/clocksource/tcb_clksrc.c b/drivers/clocksource/tcb_clksrc.c
> index d4ca9962a759..fc410b5b409d 100644
> --- a/drivers/clocksource/tcb_clksrc.c
> +++ b/drivers/clocksource/tcb_clksrc.c
> @@ -48,9 +48,9 @@ static u64 tc_get_cycles(struct clocksource *cs)
>  
>  	raw_local_irq_save(flags);
>  	do {
> -		upper = __raw_readl(tcaddr + ATMEL_TC_REG(1, CV));
> -		lower = __raw_readl(tcaddr + ATMEL_TC_REG(0, CV));
> -	} while (upper != __raw_readl(tcaddr + ATMEL_TC_REG(1, CV)));
> +		upper = readl_relaxed(tcaddr + ATMEL_TC_REG(1, CV));
> +		lower = readl_relaxed(tcaddr + ATMEL_TC_REG(0, CV));
> +	} while (upper != readl_relaxed(tcaddr + ATMEL_TC_REG(1, CV)));
>  
>  	raw_local_irq_restore(flags);
>  	return (upper << 16) | lower;
> @@ -58,7 +58,7 @@ static u64 tc_get_cycles(struct clocksource *cs)
>  
>  static u64 tc_get_cycles32(struct clocksource *cs)
>  {
> -	return __raw_readl(tcaddr + ATMEL_TC_REG(0, CV));
> +	return readl_relaxed(tcaddr + ATMEL_TC_REG(0, CV));
>  }
>  
>  static struct clocksource clksrc = {
> @@ -96,8 +96,8 @@ static int tc_shutdown(struct clock_event_device *d)
>  	struct tc_clkevt_device *tcd = to_tc_clkevt(d);
>  	void __iomem		*regs = tcd->regs;
>  
> -	__raw_writel(0xff, regs + ATMEL_TC_REG(2, IDR));
> -	__raw_writel(ATMEL_TC_CLKDIS, regs + ATMEL_TC_REG(2, CCR));
> +	writel(0xff, regs + ATMEL_TC_REG(2, IDR));
> +	writel(ATMEL_TC_CLKDIS, regs + ATMEL_TC_REG(2, CCR));
>  	if (!clockevent_state_detached(d))
>  		clk_disable(tcd->clk);
>  
> @@ -115,9 +115,9 @@ static int tc_set_oneshot(struct clock_event_device *d)
>  	clk_enable(tcd->clk);
>  
>  	/* slow clock, count up to RC, then irq and stop */
> -	__raw_writel(timer_clock | ATMEL_TC_CPCSTOP | ATMEL_TC_WAVE |
> +	writel(timer_clock | ATMEL_TC_CPCSTOP | ATMEL_TC_WAVE |
>  		     ATMEL_TC_WAVESEL_UP_AUTO, regs + ATMEL_TC_REG(2, CMR));
> -	__raw_writel(ATMEL_TC_CPCS, regs + ATMEL_TC_REG(2, IER));
> +	writel(ATMEL_TC_CPCS, regs + ATMEL_TC_REG(2, IER));
>  
>  	/* set_next_event() configures and starts the timer */
>  	return 0;
> @@ -137,25 +137,25 @@ static int tc_set_periodic(struct clock_event_device *d)
>  	clk_enable(tcd->clk);
>  
>  	/* slow clock, count up to RC, then irq and restart */
> -	__raw_writel(timer_clock | ATMEL_TC_WAVE | ATMEL_TC_WAVESEL_UP_AUTO,
> +	writel(timer_clock | ATMEL_TC_WAVE | ATMEL_TC_WAVESEL_UP_AUTO,
>  		     regs + ATMEL_TC_REG(2, CMR));
> -	__raw_writel((32768 + HZ / 2) / HZ, tcaddr + ATMEL_TC_REG(2, RC));
> +	writel((32768 + HZ / 2) / HZ, tcaddr + ATMEL_TC_REG(2, RC));
>  
>  	/* Enable clock and interrupts on RC compare */
> -	__raw_writel(ATMEL_TC_CPCS, regs + ATMEL_TC_REG(2, IER));
> +	writel(ATMEL_TC_CPCS, regs + ATMEL_TC_REG(2, IER));
>  
>  	/* go go gadget! */
> -	__raw_writel(ATMEL_TC_CLKEN | ATMEL_TC_SWTRG, regs +
> +	writel(ATMEL_TC_CLKEN | ATMEL_TC_SWTRG, regs +
>  		     ATMEL_TC_REG(2, CCR));
>  	return 0;
>  }
>  
>  static int tc_next_event(unsigned long delta, struct clock_event_device *d)
>  {
> -	__raw_writel(delta, tcaddr + ATMEL_TC_REG(2, RC));
> +	writel_relaxed(delta, tcaddr + ATMEL_TC_REG(2, RC));
>  
>  	/* go go gadget! */
> -	__raw_writel(ATMEL_TC_CLKEN | ATMEL_TC_SWTRG,
> +	writel_relaxed(ATMEL_TC_CLKEN | ATMEL_TC_SWTRG,
>  			tcaddr + ATMEL_TC_REG(2, CCR));
>  	return 0;
>  }
> @@ -179,7 +179,7 @@ static irqreturn_t ch2_irq(int irq, void *handle)
>  	struct tc_clkevt_device	*dev = handle;
>  	unsigned int		sr;
>  
> -	sr = __raw_readl(dev->regs + ATMEL_TC_REG(2, SR));
> +	sr = readl_relaxed(dev->regs + ATMEL_TC_REG(2, SR));
>  	if (sr & ATMEL_TC_CPCS) {
>  		dev->clkevt.event_handler(&dev->clkevt);
>  		return IRQ_HANDLED;
> @@ -239,43 +239,43 @@ static int __init setup_clkevents(struct atmel_tc *tc, int clk32k_divisor_idx)
>  static void __init tcb_setup_dual_chan(struct atmel_tc *tc, int mck_divisor_idx)
>  {
>  	/* channel 0:  waveform mode, input mclk/8, clock TIOA0 on overflow */
> -	__raw_writel(mck_divisor_idx			/* likely divide-by-8 */
> +	writel(mck_divisor_idx			/* likely divide-by-8 */
>  			| ATMEL_TC_WAVE
>  			| ATMEL_TC_WAVESEL_UP		/* free-run */
>  			| ATMEL_TC_ACPA_SET		/* TIOA0 rises at 0 */
>  			| ATMEL_TC_ACPC_CLEAR,		/* (duty cycle 50%) */
>  			tcaddr + ATMEL_TC_REG(0, CMR));
> -	__raw_writel(0x0000, tcaddr + ATMEL_TC_REG(0, RA));
> -	__raw_writel(0x8000, tcaddr + ATMEL_TC_REG(0, RC));
> -	__raw_writel(0xff, tcaddr + ATMEL_TC_REG(0, IDR));	/* no irqs */
> -	__raw_writel(ATMEL_TC_CLKEN, tcaddr + ATMEL_TC_REG(0, CCR));
> +	writel(0x0000, tcaddr + ATMEL_TC_REG(0, RA));
> +	writel(0x8000, tcaddr + ATMEL_TC_REG(0, RC));
> +	writel(0xff, tcaddr + ATMEL_TC_REG(0, IDR));	/* no irqs */
> +	writel(ATMEL_TC_CLKEN, tcaddr + ATMEL_TC_REG(0, CCR));
>  
>  	/* channel 1:  waveform mode, input TIOA0 */
> -	__raw_writel(ATMEL_TC_XC1			/* input: TIOA0 */
> +	writel(ATMEL_TC_XC1			/* input: TIOA0 */
>  			| ATMEL_TC_WAVE
>  			| ATMEL_TC_WAVESEL_UP,		/* free-run */
>  			tcaddr + ATMEL_TC_REG(1, CMR));
> -	__raw_writel(0xff, tcaddr + ATMEL_TC_REG(1, IDR));	/* no irqs */
> -	__raw_writel(ATMEL_TC_CLKEN, tcaddr + ATMEL_TC_REG(1, CCR));
> +	writel(0xff, tcaddr + ATMEL_TC_REG(1, IDR));	/* no irqs */
> +	writel(ATMEL_TC_CLKEN, tcaddr + ATMEL_TC_REG(1, CCR));
>  
>  	/* chain channel 0 to channel 1*/
> -	__raw_writel(ATMEL_TC_TC1XC1S_TIOA0, tcaddr + ATMEL_TC_BMR);
> +	writel(ATMEL_TC_TC1XC1S_TIOA0, tcaddr + ATMEL_TC_BMR);
>  	/* then reset all the timers */
> -	__raw_writel(ATMEL_TC_SYNC, tcaddr + ATMEL_TC_BCR);
> +	writel(ATMEL_TC_SYNC, tcaddr + ATMEL_TC_BCR);
>  }
>  
>  static void __init tcb_setup_single_chan(struct atmel_tc *tc, int mck_divisor_idx)
>  {
>  	/* channel 0:  waveform mode, input mclk/8 */
> -	__raw_writel(mck_divisor_idx			/* likely divide-by-8 */
> +	writel(mck_divisor_idx			/* likely divide-by-8 */
>  			| ATMEL_TC_WAVE
>  			| ATMEL_TC_WAVESEL_UP,		/* free-run */
>  			tcaddr + ATMEL_TC_REG(0, CMR));
> -	__raw_writel(0xff, tcaddr + ATMEL_TC_REG(0, IDR));	/* no irqs */
> -	__raw_writel(ATMEL_TC_CLKEN, tcaddr + ATMEL_TC_REG(0, CCR));
> +	writel(0xff, tcaddr + ATMEL_TC_REG(0, IDR));	/* no irqs */
> +	writel(ATMEL_TC_CLKEN, tcaddr + ATMEL_TC_REG(0, CCR));
>  
>  	/* then reset all the timers */
> -	__raw_writel(ATMEL_TC_SYNC, tcaddr + ATMEL_TC_BCR);
> +	writel(ATMEL_TC_SYNC, tcaddr + ATMEL_TC_BCR);
>  }
>  
>  static int __init tcb_clksrc_init(void)
> 


-- 
Nicolas Ferre