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authorMichal Simek <michal.simek@xilinx.com>2014-02-24 15:04:03 +0100
committerMichal Simek <michal.simek@xilinx.com>2014-04-07 11:58:33 +0200
commita1715bb7ff2e09f580a1f2f7f0c34e832f54a5fe (patch)
treeb5eced148966ea80d8166f422a0fb5813c714f56 /arch/microblaze/kernel/timer.c
parent1aa1243c339d4c902c0f9c1ced45742729a86e6a (diff)
downloadlinux-a1715bb7ff2e09f580a1f2f7f0c34e832f54a5fe.tar.bz2
microblaze: Make timer driver endian aware
Detect endianess directly on the hardware and use ioread/iowrite functions. Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Diffstat (limited to 'arch/microblaze/kernel/timer.c')
-rw-r--r--arch/microblaze/kernel/timer.c62
1 files changed, 47 insertions, 15 deletions
diff --git a/arch/microblaze/kernel/timer.c b/arch/microblaze/kernel/timer.c
index 717a3d90e1b8..dd96f0e4bfa2 100644
--- a/arch/microblaze/kernel/timer.c
+++ b/arch/microblaze/kernel/timer.c
@@ -43,10 +43,33 @@ static unsigned int timer_clock_freq;
#define TCSR_PWMA (1<<9)
#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)
{
- out_be32(timer_baseaddr + TCSR0,
- in_be32(timer_baseaddr + TCSR0) & ~TCSR_ENT);
+ write_fn(read_fn(timer_baseaddr + TCSR0) & ~TCSR_ENT,
+ timer_baseaddr + TCSR0);
}
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)
load_val = 1;
/* loading value to timer reg */
- out_be32(timer_baseaddr + TLR0, load_val);
+ write_fn(load_val, timer_baseaddr + TLR0);
/* load the initial value */
- out_be32(timer_baseaddr + TCSR0, TCSR_LOAD);
+ write_fn(TCSR_LOAD, timer_baseaddr + TCSR0);
/* see timer data sheet for detail
* !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
* !MDT0 - generate mode
*/
- out_be32(timer_baseaddr + TCSR0,
- TCSR_TINT|TCSR_ENIT|TCSR_ENT|TCSR_ARHT|TCSR_UDT);
+ write_fn(TCSR_TINT|TCSR_ENIT|TCSR_ENT|TCSR_ARHT|TCSR_UDT,
+ timer_baseaddr + TCSR0);
}
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)
load_val = 1;
/* loading value to timer reg */
- out_be32(timer_baseaddr + TLR0, load_val);
+ write_fn(load_val, timer_baseaddr + TLR0);
/* load the initial value */
- out_be32(timer_baseaddr + TCSR0, TCSR_LOAD);
+ write_fn(TCSR_LOAD, timer_baseaddr + TCSR0);
- out_be32(timer_baseaddr + TCSR0,
- TCSR_TINT|TCSR_ENIT|TCSR_ENT|TCSR_ARHT|TCSR_UDT);
+ write_fn(TCSR_TINT|TCSR_ENIT|TCSR_ENT|TCSR_ARHT|TCSR_UDT,
+ timer_baseaddr + TCSR0);
}
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)
{
- 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)
@@ -169,7 +192,7 @@ static __init void xilinx_clockevent_init(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)
@@ -217,10 +240,10 @@ static int __init xilinx_clocksource_init(void)
panic("failed to register clocksource");
/* stop timer1 */
- out_be32(timer_baseaddr + TCSR1,
- in_be32(timer_baseaddr + TCSR1) & ~TCSR_ENT);
+ write_fn(read_fn(timer_baseaddr + TCSR1) & ~TCSR_ENT,
+ timer_baseaddr + TCSR1);
/* 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 */
init_xilinx_timecounter();
@@ -245,6 +268,15 @@ static void __init xilinx_timer_init(struct device_node *timer)
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);
of_property_read_u32(timer, "xlnx,one-timer-only", &timer_num);