[PATCH 07/13] clocksource: tcb_clksrc: make IO endian agnostic
Ben Dooks
ben.dooks at codethink.co.uk
Wed Mar 18 08:53:06 PDT 2015
Change the __raw read and write to use readl/writel_relaxed to make the
code endian agnostic.
Signed-off-by: Ben Dooks <ben.dooks at codethink.co.uk>
--
CC: Daniel Lezcano <daniel.lezcano at linaro.org>
CC: Thomas Gleixner <tglx at linutronix.de>
CC: Linux Kernel <linux-kernel at vger.kernel.org>
CC: Linux ARM Kernel <linux-arm-kernel at lists.infradead.org>
CC: Andrew Victor <linux at maxim.org.za>
CC: Nicolas Ferre <nicolas.ferre at atmel.com>
CC: Jean-Christophe Plagniol-Villard <plagnioj at jcrosoft.com>
---
drivers/clocksource/tcb_clksrc.c | 66 ++++++++++++++++++++++------------------
1 file changed, 37 insertions(+), 29 deletions(-)
diff --git a/drivers/clocksource/tcb_clksrc.c b/drivers/clocksource/tcb_clksrc.c
index 8bdbc45..0f819dd3 100644
--- a/drivers/clocksource/tcb_clksrc.c
+++ b/drivers/clocksource/tcb_clksrc.c
@@ -41,6 +41,14 @@
static void __iomem *tcaddr;
+#ifdef CONFIG_AVR32
+#define tcb_readl __raw_readl
+#define tcb_writel __raw_writel
+#else
+#define tcb_readl readl_relaxed
+#define tcb_writel writel_relaxed
+#endif
+
static cycle_t tc_get_cycles(struct clocksource *cs)
{
unsigned long flags;
@@ -48,9 +56,9 @@ static cycle_t 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 = tcb_readl(tcaddr + ATMEL_TC_REG(1, CV));
+ lower = tcb_readl(tcaddr + ATMEL_TC_REG(0, CV));
+ } while (upper != tcb_readl(tcaddr + ATMEL_TC_REG(1, CV)));
raw_local_irq_restore(flags);
return (upper << 16) | lower;
@@ -58,7 +66,7 @@ static cycle_t tc_get_cycles(struct clocksource *cs)
static cycle_t tc_get_cycles32(struct clocksource *cs)
{
- return __raw_readl(tcaddr + ATMEL_TC_REG(0, CV));
+ return tcb_readl(tcaddr + ATMEL_TC_REG(0, CV));
}
static struct clocksource clksrc = {
@@ -98,8 +106,8 @@ static void tc_mode(enum clock_event_mode m, struct clock_event_device *d)
if (tcd->clkevt.mode == CLOCK_EVT_MODE_PERIODIC
|| tcd->clkevt.mode == CLOCK_EVT_MODE_ONESHOT) {
- __raw_writel(0xff, regs + ATMEL_TC_REG(2, IDR));
- __raw_writel(ATMEL_TC_CLKDIS, regs + ATMEL_TC_REG(2, CCR));
+ tcb_writel(0xff, regs + ATMEL_TC_REG(2, IDR));
+ tcb_writel(ATMEL_TC_CLKDIS, regs + ATMEL_TC_REG(2, CCR));
clk_disable(tcd->clk);
}
@@ -112,16 +120,16 @@ static void tc_mode(enum clock_event_mode m, struct clock_event_device *d)
clk_enable(tcd->clk);
/* slow clock, count up to RC, then irq and restart */
- __raw_writel(timer_clock
+ tcb_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));
+ tcb_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));
+ tcb_writel(ATMEL_TC_CPCS, regs + ATMEL_TC_REG(2, IER));
/* go go gadget! */
- __raw_writel(ATMEL_TC_CLKEN | ATMEL_TC_SWTRG,
+ tcb_writel(ATMEL_TC_CLKEN | ATMEL_TC_SWTRG,
regs + ATMEL_TC_REG(2, CCR));
break;
@@ -129,10 +137,10 @@ static void tc_mode(enum clock_event_mode m, 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
+ tcb_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));
+ tcb_writel(ATMEL_TC_CPCS, regs + ATMEL_TC_REG(2, IER));
/* set_next_event() configures and starts the timer */
break;
@@ -144,10 +152,10 @@ static void tc_mode(enum clock_event_mode m, struct clock_event_device *d)
static int tc_next_event(unsigned long delta, struct clock_event_device *d)
{
- __raw_writel(delta, tcaddr + ATMEL_TC_REG(2, RC));
+ tcb_writel(delta, tcaddr + ATMEL_TC_REG(2, RC));
/* go go gadget! */
- __raw_writel(ATMEL_TC_CLKEN | ATMEL_TC_SWTRG,
+ tcb_writel(ATMEL_TC_CLKEN | ATMEL_TC_SWTRG,
tcaddr + ATMEL_TC_REG(2, CCR));
return 0;
}
@@ -169,7 +177,7 @@ 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 = tcb_readl(dev->regs + ATMEL_TC_REG(2, SR));
if (sr & ATMEL_TC_CPCS) {
dev->clkevt.event_handler(&dev->clkevt);
return IRQ_HANDLED;
@@ -221,43 +229,43 @@ 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 */
+ tcb_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));
+ tcb_writel(0x0000, tcaddr + ATMEL_TC_REG(0, RA));
+ tcb_writel(0x8000, tcaddr + ATMEL_TC_REG(0, RC));
+ tcb_writel(0xff, tcaddr + ATMEL_TC_REG(0, IDR)); /* no irqs */
+ tcb_writel(ATMEL_TC_CLKEN, tcaddr + ATMEL_TC_REG(0, CCR));
/* channel 1: waveform mode, input TIOA0 */
- __raw_writel(ATMEL_TC_XC1 /* input: TIOA0 */
+ tcb_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));
+ tcb_writel(0xff, tcaddr + ATMEL_TC_REG(1, IDR)); /* no irqs */
+ tcb_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);
+ tcb_writel(ATMEL_TC_TC1XC1S_TIOA0, tcaddr + ATMEL_TC_BMR);
/* then reset all the timers */
- __raw_writel(ATMEL_TC_SYNC, tcaddr + ATMEL_TC_BCR);
+ tcb_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 */
+ tcb_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));
+ tcb_writel(0xff, tcaddr + ATMEL_TC_REG(0, IDR)); /* no irqs */
+ tcb_writel(ATMEL_TC_CLKEN, tcaddr + ATMEL_TC_REG(0, CCR));
/* then reset all the timers */
- __raw_writel(ATMEL_TC_SYNC, tcaddr + ATMEL_TC_BCR);
+ tcb_writel(ATMEL_TC_SYNC, tcaddr + ATMEL_TC_BCR);
}
static int __init tcb_clksrc_init(void)
--
2.1.4
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