diff options
| author | Lee Jones <lee.jones@linaro.org> | 2012-04-24 11:04:46 +0200 |
|---|---|---|
| committer | Linus Walleij <linus.walleij@linaro.org> | 2012-05-02 00:43:14 +0200 |
| commit | c51423fc067b00d8c8bd0e4e7bc861bf9050511d (patch) | |
| tree | 965c40df3e3acc6234a044abc78e05ecec45735d | |
| parent | ARM: ux500: Disable SMSC911x platform code registration when DT is enabled (diff) | |
| download | linux-c51423fc067b00d8c8bd0e4e7bc861bf9050511d.tar.xz linux-c51423fc067b00d8c8bd0e4e7bc861bf9050511d.zip | |
ARM: ux500: Enable PRCMU Timer 4 (clocksource) for Device Tree
In dbx500 based devices the PRCMU Timer 4 is used as a clocksource
and sched_clock. Here we fetch all necessary addressing information
required for correct PRCMU initialisation from the Device Tree
instead of using hard-coded values.
CC: Samuel Ortiz <sameo@linux.intel.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
| -rw-r--r-- | arch/arm/mach-ux500/timer.c | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/arch/arm/mach-ux500/timer.c b/arch/arm/mach-ux500/timer.c index d37df98b5c32..885c74231b8d 100644 --- a/arch/arm/mach-ux500/timer.c +++ b/arch/arm/mach-ux500/timer.c @@ -8,6 +8,7 @@ #include <linux/errno.h> #include <linux/clksrc-dbx500-prcmu.h> #include <linux/of.h> +#include <linux/of_address.h> #include <asm/smp_twd.h> @@ -43,10 +44,17 @@ static void __init ux500_twd_init(void) #define ux500_twd_init() do { } while(0) #endif +const static struct of_device_id prcmu_timer_of_match[] __initconst = { + { .compatible = "stericsson,db8500-prcmu-timer-4", }, + { }, +}; + static void __init ux500_timer_init(void) { void __iomem *mtu_timer_base; void __iomem *prcmu_timer_base; + void __iomem *tmp_base; + struct device_node *np; if (cpu_is_u5500()) { mtu_timer_base = __io_address(U5500_MTU0_BASE); @@ -58,6 +66,22 @@ static void __init ux500_timer_init(void) ux500_unknown_soc(); } + /* TODO: Once MTU has been DT:ed place code above into else. */ + if (of_have_populated_dt()) { + np = of_find_matching_node(NULL, prcmu_timer_of_match); + if (!np) + goto dt_fail; + + tmp_base = of_iomap(np, 0); + if (!tmp_base) + goto dt_fail; + + prcmu_timer_base = tmp_base; + } + +dt_fail: + /* Doing it the old fashioned way. */ + /* * Here we register the timerblocks active in the system. * Localtimers (twd) is started when both cpu is up and running. |