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microblaze: Make timer driver endian aware

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Detect endianess directly on the hardware and use
ioread/iowrite functions.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
This commit is contained in:
Michal Simek 2014-02-24 15:04:03 +01:00
parent 1aa1243c33
commit a1715bb7ff
1 changed files with 47 additions and 15 deletions
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62
arch/microblaze/kernel/timer.c
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@ -43,10 +43,33 @@ static unsigned int timer_clock_freq;
#define TCSR_PWMA (1<<9) #define TCSR_PWMA (1<<9)
#define TCSR_ENALL (1<<10) #define TCSR_ENALL (1<<10)
static unsigned int (*read_fn)(void __iomem *);
static void (*write_fn)(u32, void __iomem *);
static void timer_write32(u32 val, void __iomem *addr)
{
iowrite32(val, addr);
}
static unsigned int timer_read32(void __iomem *addr)
{
return ioread32(addr);
}
static void timer_write32_be(u32 val, void __iomem *addr)
{
iowrite32be(val, addr);
}
static unsigned int timer_read32_be(void __iomem *addr)
{
return ioread32be(addr);
}
static inline void xilinx_timer0_stop(void) static inline void xilinx_timer0_stop(void)
{ {
out_be32(timer_baseaddr + TCSR0, write_fn(read_fn(timer_baseaddr + TCSR0) & ~TCSR_ENT,
in_be32(timer_baseaddr + TCSR0) & ~TCSR_ENT); timer_baseaddr + TCSR0);
} }
static inline void xilinx_timer0_start_periodic(unsigned long load_val) static inline void xilinx_timer0_start_periodic(unsigned long load_val)
@ -54,10 +77,10 @@ static inline void xilinx_timer0_start_periodic(unsigned long load_val)
if (!load_val) if (!load_val)
load_val = 1; load_val = 1;
/* loading value to timer reg */ /* loading value to timer reg */
out_be32(timer_baseaddr + TLR0, load_val); write_fn(load_val, timer_baseaddr + TLR0);
/* load the initial value */ /* load the initial value */
out_be32(timer_baseaddr + TCSR0, TCSR_LOAD); write_fn(TCSR_LOAD, timer_baseaddr + TCSR0);
/* see timer data sheet for detail /* see timer data sheet for detail
* !ENALL - don't enable 'em all * !ENALL - don't enable 'em all
@ -72,8 +95,8 @@ static inline void xilinx_timer0_start_periodic(unsigned long load_val)
* UDT - set the timer as down counter * UDT - set the timer as down counter
* !MDT0 - generate mode * !MDT0 - generate mode
*/ */
out_be32(timer_baseaddr + TCSR0, write_fn(TCSR_TINT|TCSR_ENIT|TCSR_ENT|TCSR_ARHT|TCSR_UDT,
TCSR_TINT|TCSR_ENIT|TCSR_ENT|TCSR_ARHT|TCSR_UDT); timer_baseaddr + TCSR0);
} }
static inline void xilinx_timer0_start_oneshot(unsigned long load_val) static inline void xilinx_timer0_start_oneshot(unsigned long load_val)
@ -81,13 +104,13 @@ static inline void xilinx_timer0_start_oneshot(unsigned long load_val)
if (!load_val) if (!load_val)
load_val = 1; load_val = 1;
/* loading value to timer reg */ /* loading value to timer reg */
out_be32(timer_baseaddr + TLR0, load_val); write_fn(load_val, timer_baseaddr + TLR0);
/* load the initial value */ /* load the initial value */
out_be32(timer_baseaddr + TCSR0, TCSR_LOAD); write_fn(TCSR_LOAD, timer_baseaddr + TCSR0);
out_be32(timer_baseaddr + TCSR0, write_fn(TCSR_TINT|TCSR_ENIT|TCSR_ENT|TCSR_ARHT|TCSR_UDT,
TCSR_TINT|TCSR_ENIT|TCSR_ENT|TCSR_ARHT|TCSR_UDT); timer_baseaddr + TCSR0);
} }
static int xilinx_timer_set_next_event(unsigned long delta, static int xilinx_timer_set_next_event(unsigned long delta,
@ -133,7 +156,7 @@ static struct clock_event_device clockevent_xilinx_timer = {
static inline void timer_ack(void) static inline void timer_ack(void)
{ {
out_be32(timer_baseaddr + TCSR0, in_be32(timer_baseaddr + TCSR0)); write_fn(read_fn(timer_baseaddr + TCSR0), timer_baseaddr + TCSR0);
} }
static irqreturn_t timer_interrupt(int irq, void *dev_id) static irqreturn_t timer_interrupt(int irq, void *dev_id)
@ -169,7 +192,7 @@ static __init void xilinx_clockevent_init(void)
static u64 xilinx_clock_read(void) static u64 xilinx_clock_read(void)
{ {
return in_be32(timer_baseaddr + TCR1); return read_fn(timer_baseaddr + TCR1);
} }
static cycle_t xilinx_read(struct clocksource *cs) static cycle_t xilinx_read(struct clocksource *cs)
@ -217,10 +240,10 @@ static int __init xilinx_clocksource_init(void)
panic("failed to register clocksource"); panic("failed to register clocksource");
/* stop timer1 */ /* stop timer1 */
out_be32(timer_baseaddr + TCSR1, write_fn(read_fn(timer_baseaddr + TCSR1) & ~TCSR_ENT,
in_be32(timer_baseaddr + TCSR1) & ~TCSR_ENT); timer_baseaddr + TCSR1);
/* start timer1 - up counting without interrupt */ /* start timer1 - up counting without interrupt */
out_be32(timer_baseaddr + TCSR1, TCSR_TINT|TCSR_ENT|TCSR_ARHT); write_fn(TCSR_TINT|TCSR_ENT|TCSR_ARHT, timer_baseaddr + TCSR1);
/* register timecounter - for ftrace support */ /* register timecounter - for ftrace support */
init_xilinx_timecounter(); init_xilinx_timecounter();
@ -245,6 +268,15 @@ static void __init xilinx_timer_init(struct device_node *timer)
BUG(); BUG();
} }
write_fn = timer_write32;
read_fn = timer_read32;
write_fn(TCSR_MDT, timer_baseaddr + TCSR0);
if (!(read_fn(timer_baseaddr + TCSR0) & TCSR_MDT)) {
write_fn = timer_write32_be;
read_fn = timer_read32_be;
}
irq = irq_of_parse_and_map(timer, 0); irq = irq_of_parse_and_map(timer, 0);
of_property_read_u32(timer, "xlnx,one-timer-only", &timer_num); of_property_read_u32(timer, "xlnx,one-timer-only", &timer_num);