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authorMichal Simek <monstr@monstr.eu>2010-10-07 17:39:21 +1000
committerMichal Simek <monstr@monstr.eu>2010-10-21 15:52:00 +1000
commitccea0e6e49e4db8ee7968c183ecddb3e399c5f54 (patch)
tree387e07bf5e4eed3628c7361cdd7129cc0a31f250 /arch/microblaze
parent02b08045a0306c38131c6d7155c4034a775d40b1 (diff)
downloadblackbird-op-linux-ccea0e6e49e4db8ee7968c183ecddb3e399c5f54.tar.gz
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microblaze: Support timer on AXI lite
New microblaze systems uses two buses. One for memories and flashes and the second for low-speed peripherals which can run on different CLK. This is the reason why the kernel is trying to read clock-frequency directly from node. If there is then the kernel will work with it. If not then cpu CLK is used. Signed-off-by: Michal Simek <monstr@monstr.eu>
Diffstat (limited to 'arch/microblaze')
-rw-r--r--arch/microblaze/include/asm/cpuinfo.h1
-rw-r--r--arch/microblaze/kernel/timer.c21
2 files changed, 16 insertions, 6 deletions
diff --git a/arch/microblaze/include/asm/cpuinfo.h b/arch/microblaze/include/asm/cpuinfo.h
index 7fab800496ae..cd257537ae54 100644
--- a/arch/microblaze/include/asm/cpuinfo.h
+++ b/arch/microblaze/include/asm/cpuinfo.h
@@ -77,7 +77,6 @@ struct cpuinfo {
u32 num_rd_brk;
u32 num_wr_brk;
u32 cpu_clock_freq; /* store real freq of cpu */
- u32 freq_div_hz; /* store freq/HZ */
/* FPGA family */
u32 fpga_family_code;
diff --git a/arch/microblaze/kernel/timer.c b/arch/microblaze/kernel/timer.c
index fcb97e86003d..a5aa33db1df3 100644
--- a/arch/microblaze/kernel/timer.c
+++ b/arch/microblaze/kernel/timer.c
@@ -38,6 +38,9 @@ static unsigned int timer_baseaddr;
#define TIMER_BASE timer_baseaddr
#endif
+unsigned int freq_div_hz;
+unsigned int timer_clock_freq;
+
#define TCSR0 (0x00)
#define TLR0 (0x04)
#define TCR0 (0x08)
@@ -115,7 +118,7 @@ static void microblaze_timer_set_mode(enum clock_event_mode mode,
switch (mode) {
case CLOCK_EVT_MODE_PERIODIC:
printk(KERN_INFO "%s: periodic\n", __func__);
- microblaze_timer0_start_periodic(cpuinfo.freq_div_hz);
+ microblaze_timer0_start_periodic(freq_div_hz);
break;
case CLOCK_EVT_MODE_ONESHOT:
printk(KERN_INFO "%s: oneshot\n", __func__);
@@ -168,7 +171,7 @@ static struct irqaction timer_irqaction = {
static __init void microblaze_clockevent_init(void)
{
clockevent_microblaze_timer.mult =
- div_sc(cpuinfo.cpu_clock_freq, NSEC_PER_SEC,
+ div_sc(timer_clock_freq, NSEC_PER_SEC,
clockevent_microblaze_timer.shift);
clockevent_microblaze_timer.max_delta_ns =
clockevent_delta2ns((u32)~0, &clockevent_microblaze_timer);
@@ -201,7 +204,7 @@ static struct cyclecounter microblaze_cc = {
int __init init_microblaze_timecounter(void)
{
- microblaze_cc.mult = div_sc(cpuinfo.cpu_clock_freq, NSEC_PER_SEC,
+ microblaze_cc.mult = div_sc(timer_clock_freq, NSEC_PER_SEC,
microblaze_cc.shift);
timecounter_init(&microblaze_tc, &microblaze_cc, sched_clock());
@@ -221,7 +224,7 @@ static struct clocksource clocksource_microblaze = {
static int __init microblaze_clocksource_init(void)
{
clocksource_microblaze.mult =
- clocksource_hz2mult(cpuinfo.cpu_clock_freq,
+ clocksource_hz2mult(timer_clock_freq,
clocksource_microblaze.shift);
if (clocksource_register(&clocksource_microblaze))
panic("failed to register clocksource");
@@ -247,6 +250,7 @@ void __init time_init(void)
u32 irq, i = 0;
u32 timer_num = 1;
struct device_node *timer = NULL;
+ const void *prop;
#ifdef CONFIG_SELFMOD_TIMER
unsigned int timer_baseaddr = 0;
int arr_func[] = {
@@ -286,7 +290,14 @@ void __init time_init(void)
printk(KERN_INFO "%s #0 at 0x%08x, irq=%d\n",
timer_list[i], timer_baseaddr, irq);
- cpuinfo.freq_div_hz = cpuinfo.cpu_clock_freq / HZ;
+ /* If there is clock-frequency property than use it */
+ prop = of_get_property(timer, "clock-frequency", NULL);
+ if (prop)
+ timer_clock_freq = be32_to_cpup(prop);
+ else
+ timer_clock_freq = cpuinfo.cpu_clock_freq;
+
+ freq_div_hz = timer_clock_freq / HZ;
setup_irq(irq, &timer_irqaction);
#ifdef CONFIG_HEART_BEAT
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