From: Jean-Christophe PLAGNIOL-VILLARD Date: Mon, 20 Feb 2012 10:07:39 +0000 (+0100) Subject: ARM: at91: make ST (System Timer) soc independent X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=5e9cf5e;p=linux-beck.git ARM: at91: make ST (System Timer) soc independent Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD Acked-by: Nicolas Ferre Reviewed-by: Ryan Mallon --- diff --git a/arch/arm/mach-at91/at91rm9200.c b/arch/arm/mach-at91/at91rm9200.c index dd6e2de13420..ebe597b1b998 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); } /* -------------------------------------------------------------------- @@ -319,6 +319,7 @@ static void __init at91rm9200_map_io(void) static void __init at91rm9200_ioremap_registers(void) { + at91rm9200_ioremap_st(AT91RM9200_BASE_ST); } static void __init at91rm9200_initialize(void) diff --git a/arch/arm/mach-at91/at91rm9200_time.c b/arch/arm/mach-at91/at91rm9200_time.c index a028cdf8f974..0c1980c3608a 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(addr, 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 dc74ec043576..aec7fd054cc4 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 8847173e4101..969aac27109f 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 fbde3064b623..0d0b9b3d2fe4 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 b3046dc4b56c..7ceefd29ae14 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); } /* ......................................................................... */