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| author | Soren Brinkmann <soren.brinkmann@xilinx.com> | 2014-09-02 14:19:06 -0700 |
|---|---|---|
| committer | Michal Simek <michal.simek@xilinx.com> | 2014-09-16 12:55:05 +0200 |
| commit | ae88b85e801ba77939b07eb9214f1d6542fa23f7 (patch) | |
| tree | b325f4b494a3d308eccdf3a3bcf509fc54f3c090 | |
| parent | 7d1311b93e58ed55f3a31cc8f94c4b8fe988a2b9 (diff) | |
| download | linux-ae88b85e801ba77939b07eb9214f1d6542fa23f7.tar.gz | |
ARM: zynq: PM: Enable A9 internal clock gating feature
Signed-off-by: Soren Brinkmann <soren.brinkmann@xilinx.com> Signed-off-by: Michal Simek <michal.simek@xilinx.com>
| -rw-r--r-- | arch/arm/mach-zynq/common.c | 6 | ||||
| -rw-r--r-- | arch/arm/mach-zynq/common.h | 11 | ||||
| -rw-r--r-- | arch/arm/mach-zynq/platsmp.c | 13 |
3 files changed, 30 insertions, 0 deletions
diff --git a/arch/arm/mach-zynq/common.c b/arch/arm/mach-zynq/common.c index 31a6fa40ba37..3cb7c198615a 100644 --- a/arch/arm/mach-zynq/common.c +++ b/arch/arm/mach-zynq/common.c @@ -98,6 +98,11 @@ static int __init zynq_get_revision(void) return revision; } +static void __init zynq_init_late(void) +{ + zynq_core_pm_init(); +} + /** * zynq_init_machine - System specific initialization, intended to be * called from board specific initialization. @@ -204,6 +209,7 @@ DT_MACHINE_START(XILINX_EP107, "Xilinx Zynq Platform") .map_io = zynq_map_io, .init_irq = zynq_irq_init, .init_machine = zynq_init_machine, + .init_late = zynq_init_late, .init_time = zynq_timer_init, .dt_compat = zynq_dt_match, .reserve = zynq_memory_init, diff --git a/arch/arm/mach-zynq/common.h b/arch/arm/mach-zynq/common.h index f652f0a884a6..596ef0b5067c 100644 --- a/arch/arm/mach-zynq/common.h +++ b/arch/arm/mach-zynq/common.h @@ -40,4 +40,15 @@ extern void __iomem *zynq_scu_base; /* Hotplug */ extern void zynq_platform_cpu_die(unsigned int cpu); +static inline void zynq_core_pm_init(void) +{ + /* A9 clock gating */ + asm volatile ("mrc p15, 0, r12, c15, c0, 0\n" + "orr r12, r12, #1\n" + "mcr p15, 0, r12, c15, c0, 0\n" + : /* no outputs */ + : /* no inputs */ + : "r12"); +} + #endif diff --git a/arch/arm/mach-zynq/platsmp.c b/arch/arm/mach-zynq/platsmp.c index abc82ef085c1..6c7843108c7f 100644 --- a/arch/arm/mach-zynq/platsmp.c +++ b/arch/arm/mach-zynq/platsmp.c @@ -112,6 +112,18 @@ static void __init zynq_smp_prepare_cpus(unsigned int max_cpus) scu_enable(zynq_scu_base); } +/** + * zynq_secondary_init - Initialize secondary CPU cores + * @cpu: CPU that is initialized + * + * This function is in the hotplug path. Don't move it into the + * init section!! + */ +static void zynq_secondary_init(unsigned int cpu) +{ + zynq_core_pm_init(); +} + #ifdef CONFIG_HOTPLUG_CPU static int zynq_cpu_kill(unsigned cpu) { @@ -124,6 +136,7 @@ struct smp_operations zynq_smp_ops __initdata = { .smp_init_cpus = zynq_smp_init_cpus, .smp_prepare_cpus = zynq_smp_prepare_cpus, .smp_boot_secondary = zynq_boot_secondary, + .smp_secondary_init = zynq_secondary_init, #ifdef CONFIG_HOTPLUG_CPU .cpu_die = zynq_platform_cpu_die, .cpu_kill = zynq_cpu_kill, |