diff options
author | Magnus Damm <damm+renesas@opensource.se> | 2016-06-28 16:10:36 +0200 |
---|---|---|
committer | Simon Horman <horms+renesas@verge.net.au> | 2016-06-29 14:42:48 +0200 |
commit | 5f3bca0db8ac01a73622361f6062939638bf4730 (patch) | |
tree | c3f37df71cc26a10162d0a0832d8d7b60de92320 /arch/arm/mach-shmobile | |
parent | d3f3fb0cfdcf4cbf69af65e8bfdde65cedf4e53a (diff) | |
download | op-kernel-dev-5f3bca0db8ac01a73622361f6062939638bf4730.zip op-kernel-dev-5f3bca0db8ac01a73622361f6062939638bf4730.tar.gz |
ARM: shmobile: apmu: Add APMU DT support via Enable method
Allow DT configuration of the APMU hardware in the case when the APMU is
pointed out in the DTB via the enable-method. The ability to configure
the APMU via C code is still kept intact to prevent DTB breakage for older
SoCs that do not rely on the enable-method for SMP support.
Signed-off-by: Magnus Damm <damm+renesas@opensource.se>
[geert: Fix CONFIG_SMP=n build]
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
Diffstat (limited to 'arch/arm/mach-shmobile')
-rw-r--r-- | arch/arm/mach-shmobile/platsmp-apmu.c | 92 |
1 files changed, 88 insertions, 4 deletions
diff --git a/arch/arm/mach-shmobile/platsmp-apmu.c b/arch/arm/mach-shmobile/platsmp-apmu.c index c1558ef..0c6bb45 100644 --- a/arch/arm/mach-shmobile/platsmp-apmu.c +++ b/arch/arm/mach-shmobile/platsmp-apmu.c @@ -24,6 +24,7 @@ #include <asm/suspend.h> #include "common.h" #include "platsmp-apmu.h" +#include "rcar-gen2.h" static struct { void __iomem *iomem; @@ -118,14 +119,66 @@ static void apmu_parse_cfg(void (*fn)(struct resource *res, int cpu, int bit), } } -void __init shmobile_smp_apmu_prepare_cpus(unsigned int max_cpus, - struct rcar_apmu_config *apmu_config, - int num) +static const struct of_device_id apmu_ids[] = { + { .compatible = "renesas,apmu" }, + { /*sentinel*/ } +}; + +static void apmu_parse_dt(void (*fn)(struct resource *res, int cpu, int bit)) +{ + struct device_node *np_apmu, *np_cpu; + struct resource res; + int bit, index; + u32 id; + + for_each_matching_node(np_apmu, apmu_ids) { + /* only enable the cluster that includes the boot CPU */ + bool is_allowed = false; + + for (bit = 0; bit < CONFIG_NR_CPUS; bit++) { + np_cpu = of_parse_phandle(np_apmu, "cpus", bit); + if (np_cpu) { + if (!of_property_read_u32(np_cpu, "reg", &id)) { + if (id == cpu_logical_map(0)) { + is_allowed = true; + of_node_put(np_cpu); + break; + } + + } + of_node_put(np_cpu); + } + } + if (!is_allowed) + continue; + + for (bit = 0; bit < CONFIG_NR_CPUS; bit++) { + np_cpu = of_parse_phandle(np_apmu, "cpus", bit); + if (np_cpu) { + if (!of_property_read_u32(np_cpu, "reg", &id)) { + index = get_logical_index(id); + if ((index >= 0) && + !of_address_to_resource(np_apmu, + 0, &res)) + fn(&res, index, bit); + } + of_node_put(np_cpu); + } + } + } +} + +static void __init shmobile_smp_apmu_setup_boot(void) { /* install boot code shared by all CPUs */ shmobile_boot_fn = virt_to_phys(shmobile_smp_boot); +} - /* perform per-cpu setup */ +void __init shmobile_smp_apmu_prepare_cpus(unsigned int max_cpus, + struct rcar_apmu_config *apmu_config, + int num) +{ + shmobile_smp_apmu_setup_boot(); apmu_parse_cfg(apmu_init_cpu, apmu_config, num); } @@ -136,7 +189,38 @@ int shmobile_smp_apmu_boot_secondary(unsigned int cpu, struct task_struct *idle) return apmu_wrap(cpu, apmu_power_on); } + +static void __init shmobile_smp_apmu_prepare_cpus_dt(unsigned int max_cpus) +{ + shmobile_smp_apmu_setup_boot(); + apmu_parse_dt(apmu_init_cpu); + rcar_gen2_pm_init(); +} + +static int shmobile_smp_apmu_boot_secondary_md21(unsigned int cpu, + struct task_struct *idle) +{ + /* Error out when hardware debug mode is enabled */ + if (rcar_gen2_read_mode_pins() & BIT(21)) { + pr_warn("Unable to boot CPU%u when MD21 is set\n", cpu); + return -ENOTSUPP; + } + + return shmobile_smp_apmu_boot_secondary(cpu, idle); +} + +static struct smp_operations apmu_smp_ops __initdata = { + .smp_prepare_cpus = shmobile_smp_apmu_prepare_cpus_dt, + .smp_boot_secondary = shmobile_smp_apmu_boot_secondary_md21, +#ifdef CONFIG_HOTPLUG_CPU + .cpu_can_disable = shmobile_smp_cpu_can_disable, + .cpu_die = shmobile_smp_apmu_cpu_die, + .cpu_kill = shmobile_smp_apmu_cpu_kill, #endif +}; + +CPU_METHOD_OF_DECLARE(shmobile_smp_apmu, "renesas,apmu", &apmu_smp_ops); +#endif /* CONFIG_SMP */ #if defined(CONFIG_HOTPLUG_CPU) || defined(CONFIG_SUSPEND) /* nicked from arch/arm/mach-exynos/hotplug.c */ |