ARM: EXYNOS: add coupled cpuidle support for Exynos3250

The following patch adds coupled cpuidle support for Exynos3250 to
an existing cpuidle-exynos driver.  As a result it enables AFTR mode
to be used by default on Exynos3250 without the need to hot unplug
CPU1 first.

The detailed changelog:
- use exynos_[get,set]_boot_addr() in cpuidle-exynos.c and then make
  cpu_boot_reg_base() static
- use exynos_core_restart() in exynos_cpu0_enter_aftr()
- add missing smp_rmb() to exynos_cpu0_enter_aftr() (to make the code
  in-sync with the platform SMP code)
- add call_firmware_op(cpu_boot, 1) to exynos_cpu0_enter_aftr()
- use dsb_sev() instead of IPI wakeup for Exynos3250 in
  exynos_cpu0_enter_aftr()
- add CPU0 vs CPU1 synchronization based on S5P_PMU_SPARE2 register
  for Exynos3250 to cpuidle-exynos.c
- add flush_cache_all() for CPU1/0 before powerdown/AFTR for
  Exynos3250 to exynos_wfi_finisher()/exynos_do_idle()

Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Cc: Daniel Lezcano <daniel.lezcano@linaro.org>
Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Signed-off-by: Kukjin Kim <kgene@kernel.org>

diff --git a/arch/arm/mach-exynos/common.h b/arch/arm/mach-exynos/common.h
index 5f5cd56..e3a9256 100644 (file)
--- a/arch/arm/mach-exynos/common.h
+++ b/arch/arm/mach-exynos/common.h
@@ -163,7 +163,9 @@ extern void exynos_set_delayed_reset_assertion(bool enable);
 
 extern void s5p_init_cpu(void __iomem *cpuid_addr);
 extern unsigned int samsung_rev(void);
-extern void __iomem *cpu_boot_reg_base(void);
+extern void exynos_core_restart(u32 core_id);
+extern int exynos_set_boot_addr(u32 core_id, unsigned long boot_addr);
+extern int exynos_get_boot_addr(u32 core_id, unsigned long *boot_addr);
 
 static inline void pmu_raw_writel(u32 val, u32 offset)
 {

diff --git a/arch/arm/mach-exynos/exynos.c b/arch/arm/mach-exynos/exynos.c
index 5917a30..4bd8b76 100644 (file)
--- a/arch/arm/mach-exynos/exynos.c
+++ b/arch/arm/mach-exynos/exynos.c
@@ -234,7 +234,8 @@ static void __init exynos_dt_machine_init(void)
                exynos_sysram_init();
 
 #if defined(CONFIG_SMP) && defined(CONFIG_ARM_EXYNOS_CPUIDLE)
-       if (of_machine_is_compatible("samsung,exynos4210"))
+       if (of_machine_is_compatible("samsung,exynos4210") ||
+           of_machine_is_compatible("samsung,exynos3250"))
                exynos_cpuidle.dev.platform_data = &cpuidle_coupled_exynos_data;
 #endif
        if (of_machine_is_compatible("samsung,exynos4210") ||

diff --git a/arch/arm/mach-exynos/firmware.c b/arch/arm/mach-exynos/firmware.c
index b30562d..245f6de 100644 (file)
--- a/arch/arm/mach-exynos/firmware.c
+++ b/arch/arm/mach-exynos/firmware.c
@@ -49,6 +49,7 @@ static int exynos_do_idle(unsigned long mode)
                             sysram_ns_base_addr + 0x24);
                __raw_writel(EXYNOS_AFTR_MAGIC, sysram_ns_base_addr + 0x20);
                if (soc_is_exynos3250()) {
+                       flush_cache_all();
                        exynos_smc(SMC_CMD_SAVE, OP_TYPE_CORE,
                                   SMC_POWERSTATE_IDLE, 0);
                        exynos_smc(SMC_CMD_SHUTDOWN, OP_TYPE_CLUSTER,

diff --cc arch/arm/mach-exynos/platsmp.c
Simple merge

diff --cc arch/arm/mach-exynos/pm.c
Simple merge