diff options
| author | Magnus Damm <damm@opensource.se> | 2014-03-06 12:28:24 +0900 |
|---|---|---|
| committer | Simon Horman <horms+renesas@verge.net.au> | 2014-04-14 11:25:33 +0900 |
| commit | c39dae380b4a11f1050a2ef6607598dcbe0541be (patch) | |
| tree | 442327a5a2a9b7bbb473b6d73be2520cf474d85f /arch/arm/mach-shmobile/timer.c | |
| parent | ce4b6a04c49b0b414d537b45ededd9dfd4e48336 (diff) | |
| download | lwn-c39dae380b4a11f1050a2ef6607598dcbe0541be.tar.gz lwn-c39dae380b4a11f1050a2ef6607598dcbe0541be.zip | |
ARM: shmobile: Add shared shmobile_init_delay()
Introduce shmobile_init_delay() that gets CPU specific
parameters from DT and sets up the early delay from
there. This allows us to both remove frequency information
from the C code and consolidate existing code.
Signed-off-by: Magnus Damm <damm@opensource.se>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
Diffstat (limited to 'arch/arm/mach-shmobile/timer.c')
| -rw-r--r-- | arch/arm/mach-shmobile/timer.c | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/arch/arm/mach-shmobile/timer.c b/arch/arm/mach-shmobile/timer.c index 62d7052d6f21..ccecde9a3362 100644 --- a/arch/arm/mach-shmobile/timer.c +++ b/arch/arm/mach-shmobile/timer.c @@ -21,6 +21,7 @@ #include <linux/platform_device.h> #include <linux/clocksource.h> #include <linux/delay.h> +#include <linux/of_address.h> void __init shmobile_setup_delay(unsigned int max_cpu_core_mhz, unsigned int mult, unsigned int div) @@ -39,6 +40,33 @@ void __init shmobile_setup_delay(unsigned int max_cpu_core_mhz, preset_lpj = max_cpu_core_mhz * value; } +void __init shmobile_init_delay(void) +{ + struct device_node *np, *parent; + u32 max_freq, freq; + + max_freq = 0; + + parent = of_find_node_by_path("/cpus"); + if (parent) { + for_each_child_of_node(parent, np) { + if (!of_property_read_u32(np, "clock-frequency", &freq)) + max_freq = max(max_freq, freq); + } + of_node_put(parent); + } + + if (max_freq) { + if (of_find_compatible_node(NULL, NULL, "arm,cortex-a8")) + shmobile_setup_delay(max_freq, 1, 3); + else if (of_find_compatible_node(NULL, NULL, "arm,cortex-a9")) + shmobile_setup_delay(max_freq, 1, 3); + else if (of_find_compatible_node(NULL, NULL, "arm,cortex-a15")) + if (!IS_ENABLED(CONFIG_ARM_ARCH_TIMER)) + shmobile_setup_delay(max_freq, 2, 4); + } +} + static void __init shmobile_late_time_init(void) { /* |