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Message-Id: <957702b1ff83afcc0a8e842f53f05ff3f40b78b3.1329500622.git.nicolas.ferre@atmel.com>
Date: Fri, 17 Feb 2012 18:49:56 +0100
From: Nicolas Ferre <nicolas.ferre@...el.com>
To: plagnioj@...osoft.com, linux-arm-kernel@...ts.infradead.org
Cc: linux-kernel@...r.kernel.org
Subject: [PATCH 04/18] ARM: at91: make ST (System Timer) soc independent
From: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@...osoft.com>
Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@...osoft.com>
Acked-by: Nicolas Ferre <nicolas.ferre@...el.com>
---
arch/arm/mach-at91/at91rm9200.c | 4 +-
arch/arm/mach-at91/at91rm9200_time.c | 37 ++++++++++++++++----------
arch/arm/mach-at91/generic.h | 1 +
arch/arm/mach-at91/include/mach/at91_st.h | 32 +++++++++++++++-------
arch/arm/mach-at91/include/mach/at91rm9200.h | 2 +-
drivers/watchdog/at91rm9200_wdt.c | 8 +++---
6 files changed, 53 insertions(+), 31 deletions(-)
diff --git a/arch/arm/mach-at91/at91rm9200.c b/arch/arm/mach-at91/at91rm9200.c
index dd6e2de..5a37d40 100644
--- a/arch/arm/mach-at91/at91rm9200.c
+++ b/arch/arm/mach-at91/at91rm9200.c
@@ -303,8 +303,8 @@ static void at91rm9200_restart(char mode, const char *cmd)
/*
* Perform a hardware reset with the use of the Watchdog timer.
*/
- at91_sys_write(AT91_ST_WDMR, AT91_ST_RSTEN | AT91_ST_EXTEN | 1);
- at91_sys_write(AT91_ST_CR, AT91_ST_WDRST);
+ at91_st_write(AT91_ST_WDMR, AT91_ST_RSTEN | AT91_ST_EXTEN | 1);
+ at91_st_write(AT91_ST_CR, AT91_ST_WDRST);
}
/* --------------------------------------------------------------------
diff --git a/arch/arm/mach-at91/at91rm9200_time.c b/arch/arm/mach-at91/at91rm9200_time.c
index a028cdf..52d4b45 100644
--- a/arch/arm/mach-at91/at91rm9200_time.c
+++ b/arch/arm/mach-at91/at91rm9200_time.c
@@ -43,9 +43,9 @@ static inline unsigned long read_CRTR(void)
{
unsigned long x1, x2;
- x1 = at91_sys_read(AT91_ST_CRTR);
+ x1 = at91_st_read(AT91_ST_CRTR);
do {
- x2 = at91_sys_read(AT91_ST_CRTR);
+ x2 = at91_st_read(AT91_ST_CRTR);
if (x1 == x2)
break;
x1 = x2;
@@ -58,7 +58,7 @@ static inline unsigned long read_CRTR(void)
*/
static irqreturn_t at91rm9200_timer_interrupt(int irq, void *dev_id)
{
- u32 sr = at91_sys_read(AT91_ST_SR) & irqmask;
+ u32 sr = at91_st_read(AT91_ST_SR) & irqmask;
/*
* irqs should be disabled here, but as the irq is shared they are only
@@ -110,22 +110,22 @@ static void
clkevt32k_mode(enum clock_event_mode mode, struct clock_event_device *dev)
{
/* Disable and flush pending timer interrupts */
- at91_sys_write(AT91_ST_IDR, AT91_ST_PITS | AT91_ST_ALMS);
- (void) at91_sys_read(AT91_ST_SR);
+ at91_st_write(AT91_ST_IDR, AT91_ST_PITS | AT91_ST_ALMS);
+ (void) at91_st_read(AT91_ST_SR);
last_crtr = read_CRTR();
switch (mode) {
case CLOCK_EVT_MODE_PERIODIC:
/* PIT for periodic irqs; fixed rate of 1/HZ */
irqmask = AT91_ST_PITS;
- at91_sys_write(AT91_ST_PIMR, RM9200_TIMER_LATCH);
+ at91_st_write(AT91_ST_PIMR, RM9200_TIMER_LATCH);
break;
case CLOCK_EVT_MODE_ONESHOT:
/* ALM for oneshot irqs, set by next_event()
* before 32 seconds have passed
*/
irqmask = AT91_ST_ALMS;
- at91_sys_write(AT91_ST_RTAR, last_crtr);
+ at91_st_write(AT91_ST_RTAR, last_crtr);
break;
case CLOCK_EVT_MODE_SHUTDOWN:
case CLOCK_EVT_MODE_UNUSED:
@@ -133,7 +133,7 @@ clkevt32k_mode(enum clock_event_mode mode, struct clock_event_device *dev)
irqmask = 0;
break;
}
- at91_sys_write(AT91_ST_IER, irqmask);
+ at91_st_write(AT91_ST_IER, irqmask);
}
static int
@@ -156,12 +156,12 @@ clkevt32k_next_event(unsigned long delta, struct clock_event_device *dev)
alm = read_CRTR();
/* Cancel any pending alarm; flush any pending IRQ */
- at91_sys_write(AT91_ST_RTAR, alm);
- (void) at91_sys_read(AT91_ST_SR);
+ at91_st_write(AT91_ST_RTAR, alm);
+ (void) at91_st_read(AT91_ST_SR);
/* Schedule alarm by writing RTAR. */
alm += delta;
- at91_sys_write(AT91_ST_RTAR, alm);
+ at91_st_write(AT91_ST_RTAR, alm);
return status;
}
@@ -175,15 +175,24 @@ static struct clock_event_device clkevt = {
.set_mode = clkevt32k_mode,
};
+void __iomem *at91_st_base;
+
+void __init at91rm9200_ioremap_st(u32 addr)
+{
+ at91_st_base = ioremap(AT91RM9200_BASE_ST, 256);
+ if (!at91_st_base)
+ panic("Impossible to ioremap ST\n");
+}
+
/*
* ST (system timer) module supports both clockevents and clocksource.
*/
void __init at91rm9200_timer_init(void)
{
/* Disable all timer interrupts, and clear any pending ones */
- at91_sys_write(AT91_ST_IDR,
+ at91_st_write(AT91_ST_IDR,
AT91_ST_PITS | AT91_ST_WDOVF | AT91_ST_RTTINC | AT91_ST_ALMS);
- (void) at91_sys_read(AT91_ST_SR);
+ (void) at91_st_read(AT91_ST_SR);
/* Make IRQs happen for the system timer */
setup_irq(AT91_ID_SYS, &at91rm9200_timer_irq);
@@ -192,7 +201,7 @@ void __init at91rm9200_timer_init(void)
* directly for the clocksource and all clockevents, after adjusting
* its prescaler from the 1 Hz default.
*/
- at91_sys_write(AT91_ST_RTMR, 1);
+ at91_st_write(AT91_ST_RTMR, 1);
/* Setup timer clockevent, with minimum of two ticks (important!!) */
clkevt.mult = div_sc(AT91_SLOW_CLOCK, NSEC_PER_SEC, clkevt.shift);
diff --git a/arch/arm/mach-at91/generic.h b/arch/arm/mach-at91/generic.h
index dc74ec0..aec7fd0 100644
--- a/arch/arm/mach-at91/generic.h
+++ b/arch/arm/mach-at91/generic.h
@@ -28,6 +28,7 @@ extern void __init at91_aic_init(unsigned int priority[]);
/* Timer */
struct sys_timer;
+extern void at91rm9200_ioremap_st(u32 addr);
extern struct sys_timer at91rm9200_timer;
extern void at91sam926x_ioremap_pit(u32 addr);
extern struct sys_timer at91sam926x_timer;
diff --git a/arch/arm/mach-at91/include/mach/at91_st.h b/arch/arm/mach-at91/include/mach/at91_st.h
index 8847173..969aac2 100644
--- a/arch/arm/mach-at91/include/mach/at91_st.h
+++ b/arch/arm/mach-at91/include/mach/at91_st.h
@@ -16,34 +16,46 @@
#ifndef AT91_ST_H
#define AT91_ST_H
-#define AT91_ST_CR (AT91_ST + 0x00) /* Control Register */
+#ifndef __ASSEMBLY__
+extern void __iomem *at91_st_base;
+
+#define at91_st_read(field) \
+ __raw_readl(at91_st_base + field)
+
+#define at91_st_write(field, value) \
+ __raw_writel(value, at91_st_base + field);
+#else
+.extern at91_st_base
+#endif
+
+#define AT91_ST_CR 0x00 /* Control Register */
#define AT91_ST_WDRST (1 << 0) /* Watchdog Timer Restart */
-#define AT91_ST_PIMR (AT91_ST + 0x04) /* Period Interval Mode Register */
+#define AT91_ST_PIMR 0x04 /* Period Interval Mode Register */
#define AT91_ST_PIV (0xffff << 0) /* Period Interval Value */
-#define AT91_ST_WDMR (AT91_ST + 0x08) /* Watchdog Mode Register */
+#define AT91_ST_WDMR 0x08 /* Watchdog Mode Register */
#define AT91_ST_WDV (0xffff << 0) /* Watchdog Counter Value */
#define AT91_ST_RSTEN (1 << 16) /* Reset Enable */
#define AT91_ST_EXTEN (1 << 17) /* External Signal Assertion Enable */
-#define AT91_ST_RTMR (AT91_ST + 0x0c) /* Real-time Mode Register */
+#define AT91_ST_RTMR 0x0c /* Real-time Mode Register */
#define AT91_ST_RTPRES (0xffff << 0) /* Real-time Prescalar Value */
-#define AT91_ST_SR (AT91_ST + 0x10) /* Status Register */
+#define AT91_ST_SR 0x10 /* Status Register */
#define AT91_ST_PITS (1 << 0) /* Period Interval Timer Status */
#define AT91_ST_WDOVF (1 << 1) /* Watchdog Overflow */
#define AT91_ST_RTTINC (1 << 2) /* Real-time Timer Increment */
#define AT91_ST_ALMS (1 << 3) /* Alarm Status */
-#define AT91_ST_IER (AT91_ST + 0x14) /* Interrupt Enable Register */
-#define AT91_ST_IDR (AT91_ST + 0x18) /* Interrupt Disable Register */
-#define AT91_ST_IMR (AT91_ST + 0x1c) /* Interrupt Mask Register */
+#define AT91_ST_IER 0x14 /* Interrupt Enable Register */
+#define AT91_ST_IDR 0x18 /* Interrupt Disable Register */
+#define AT91_ST_IMR 0x1c /* Interrupt Mask Register */
-#define AT91_ST_RTAR (AT91_ST + 0x20) /* Real-time Alarm Register */
+#define AT91_ST_RTAR 0x20 /* Real-time Alarm Register */
#define AT91_ST_ALMV (0xfffff << 0) /* Alarm Value */
-#define AT91_ST_CRTR (AT91_ST + 0x24) /* Current Real-time Register */
+#define AT91_ST_CRTR 0x24 /* Current Real-time Register */
#define AT91_ST_CRTV (0xfffff << 0) /* Current Real-Time Value */
#endif
diff --git a/arch/arm/mach-at91/include/mach/at91rm9200.h b/arch/arm/mach-at91/include/mach/at91rm9200.h
index fbde306..0d0b9b3 100644
--- a/arch/arm/mach-at91/include/mach/at91rm9200.h
+++ b/arch/arm/mach-at91/include/mach/at91rm9200.h
@@ -80,7 +80,6 @@
* System Peripherals (offset from AT91_BASE_SYS)
*/
#define AT91_PMC (0xfffffc00 - AT91_BASE_SYS) /* Power Management Controller */
-#define AT91_ST (0xfffffd00 - AT91_BASE_SYS) /* System Timer */
#define AT91_MC (0xffffff00 - AT91_BASE_SYS) /* Memory Controllers */
#define AT91RM9200_BASE_DBGU AT91_BASE_DBGU0 /* Debug Unit */
@@ -88,6 +87,7 @@
#define AT91RM9200_BASE_PIOB 0xfffff600 /* PIO Controller B */
#define AT91RM9200_BASE_PIOC 0xfffff800 /* PIO Controller C */
#define AT91RM9200_BASE_PIOD 0xfffffa00 /* PIO Controller D */
+#define AT91RM9200_BASE_ST 0xfffffd00 /* System Timer */
#define AT91RM9200_BASE_RTC 0xfffffe00 /* Real-Time Clock */
#define AT91_USART0 AT91RM9200_BASE_US0
diff --git a/drivers/watchdog/at91rm9200_wdt.c b/drivers/watchdog/at91rm9200_wdt.c
index b3046dc..7ceefd2 100644
--- a/drivers/watchdog/at91rm9200_wdt.c
+++ b/drivers/watchdog/at91rm9200_wdt.c
@@ -51,7 +51,7 @@ static unsigned long at91wdt_busy;
*/
static inline void at91_wdt_stop(void)
{
- at91_sys_write(AT91_ST_WDMR, AT91_ST_EXTEN);
+ at91_st_write(AT91_ST_WDMR, AT91_ST_EXTEN);
}
/*
@@ -59,9 +59,9 @@ static inline void at91_wdt_stop(void)
*/
static inline void at91_wdt_start(void)
{
- at91_sys_write(AT91_ST_WDMR, AT91_ST_EXTEN | AT91_ST_RSTEN |
+ at91_st_write(AT91_ST_WDMR, AT91_ST_EXTEN | AT91_ST_RSTEN |
(((65536 * wdt_time) >> 8) & AT91_ST_WDV));
- at91_sys_write(AT91_ST_CR, AT91_ST_WDRST);
+ at91_st_write(AT91_ST_CR, AT91_ST_WDRST);
}
/*
@@ -69,7 +69,7 @@ static inline void at91_wdt_start(void)
*/
static inline void at91_wdt_reload(void)
{
- at91_sys_write(AT91_ST_CR, AT91_ST_WDRST);
+ at91_st_write(AT91_ST_CR, AT91_ST_WDRST);
}
/* ......................................................................... */
--
1.7.9
--
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