Hi Chander,
On 15.04.2014 09:38, Chander Kashyap wrote:
Currently status/configuration power register values are hard-coded for cpu1.
Make it generic so that it is useful for SoC's with more than two cpus.
Signed-off-by: Chander Kashyap <chander.kash...@linaro.org>
---
changes in v3:
1. Move cpunr calculation to a macro
2. Changed printk format specifier from unsigned hex to unsigned decimal
Changes in v2:
1. Used existing macros for clusterid and cpuid calculation
arch/arm/mach-exynos/hotplug.c | 7 ++++---
arch/arm/mach-exynos/platsmp.c | 13 +++++++------
arch/arm/mach-exynos/regs-pmu.h | 15 +++++++++++++--
3 files changed, 24 insertions(+), 11 deletions(-)
Now as I think of it, the code that is touched by this patch is not
supposed to be used on multi-cluster systems. Instead a separate MCPM
driver should. As far as I know, somebody is said to be already working
on this.
This means that we don't need to consider multi-cluster support in this
patch and simplify any calculations to just account for core ID. This
would also eliminate any need to handle non-zero cluster ID on
single-cluster SoCs.
Please correct me if I'm wrong.
diff --git a/arch/arm/mach-exynos/hotplug.c b/arch/arm/mach-exynos/hotplug.c
index 5eead53..9f74be2 100644
--- a/arch/arm/mach-exynos/hotplug.c
+++ b/arch/arm/mach-exynos/hotplug.c
@@ -92,11 +92,12 @@ static inline void cpu_leave_lowpower(void)
static inline void platform_do_lowpower(unsigned int cpu, int *spurious)
{
+ unsigned int cpunr = ENYNOS_PMU_CPUNR(cpu_logical_map(cpu));
for (;;) {
- /* make cpu1 to be turned off at next WFI command */
- if (cpu == 1)
- __raw_writel(0, S5P_ARM_CORE1_CONFIGURATION);
+ /* make cpu to be turned off at next WFI command */
+ if (cpu)
As I mentioned in my previous reply, I don't see what could go wrong if
this check is omitted. What happens if CPU0 is being hot-unplugged?
If hardware doesn't support this (but I don't see any mention about this
in the documentation), such hotplug attempt should either simply fail on
.cpu_kill() operation for CPU0 or even have CPU0 marked as non-hotpluggable.
+ __raw_writel(0, S5P_ARM_CORE_CONFIGURATION(cpunr));
/*
* here's the WFI
diff --git a/arch/arm/mach-exynos/platsmp.c b/arch/arm/mach-exynos/platsmp.c
index 03e5e9f..d9c182f 100644
--- a/arch/arm/mach-exynos/platsmp.c
+++ b/arch/arm/mach-exynos/platsmp.c
@@ -90,7 +90,7 @@ static int exynos_boot_secondary(unsigned int cpu, struct
task_struct *idle)
{
unsigned long timeout;
unsigned long phys_cpu = cpu_logical_map(cpu);
-
+ unsigned int cpunr = ENYNOS_PMU_CPUNR(cpu_logical_map(cpu));
/*
* Set synchronisation state between this boot processor
* and the secondary one
@@ -107,14 +107,15 @@ static int exynos_boot_secondary(unsigned int cpu, struct
task_struct *idle)
*/
write_pen_release(phys_cpu);
- if (!(__raw_readl(S5P_ARM_CORE1_STATUS) & S5P_CORE_LOCAL_PWR_EN)) {
+ if (!(__raw_readl(S5P_ARM_CORE_STATUS(cpunr))
+ & S5P_CORE_LOCAL_PWR_EN)) {
__raw_writel(S5P_CORE_LOCAL_PWR_EN,
- S5P_ARM_CORE1_CONFIGURATION);
+ S5P_ARM_CORE_CONFIGURATION(cpunr));
timeout = 10;
- /* wait max 10 ms until cpu1 is on */
- while ((__raw_readl(S5P_ARM_CORE1_STATUS)
+ /* wait max 10 ms until secondary cpu is on */
+ while ((__raw_readl(S5P_ARM_CORE_STATUS(cpunr))
& S5P_CORE_LOCAL_PWR_EN) != S5P_CORE_LOCAL_PWR_EN) {
if (timeout-- == 0)
break;
@@ -123,7 +124,7 @@ static int exynos_boot_secondary(unsigned int cpu, struct
task_struct *idle)
}
if (timeout == 0) {
- printk(KERN_ERR "cpu1 power enable failed");
+ pr_err("cpu%u power enable failed", cpu);
spin_unlock(&boot_lock);
return -ETIMEDOUT;
}
diff --git a/arch/arm/mach-exynos/regs-pmu.h b/arch/arm/mach-exynos/regs-pmu.h
index 4f6a256..0de6df4 100644
--- a/arch/arm/mach-exynos/regs-pmu.h
+++ b/arch/arm/mach-exynos/regs-pmu.h
@@ -105,8 +105,13 @@
#define S5P_GPS_LOWPWR S5P_PMUREG(0x139C)
#define S5P_GPS_ALIVE_LOWPWR S5P_PMUREG(0x13A0)
-#define S5P_ARM_CORE1_CONFIGURATION S5P_PMUREG(0x2080)
-#define S5P_ARM_CORE1_STATUS S5P_PMUREG(0x2084)
+#define S5P_ARM_CORE0_CONFIGURATION S5P_PMUREG(0x2000)
+#define S5P_ARM_CORE0_STATUS S5P_PMUREG(0x2004)
+
+#define S5P_ARM_CORE_CONFIGURATION(_cpunr) \
+ (S5P_ARM_CORE0_CONFIGURATION + 0x80 * (_cpunr))
+#define S5P_ARM_CORE_STATUS(_cpunr) \
+ (S5P_ARM_CORE0_STATUS + 0x80 * (_cpunr))
#define S5P_PAD_RET_MAUDIO_OPTION S5P_PMUREG(0x3028)
#define S5P_PAD_RET_GPIO_OPTION S5P_PMUREG(0x3108)
@@ -313,4 +318,10 @@
#define EXYNOS5_OPTION_USE_RETENTION (1 << 4)
+#include <asm/cputype.h>
+#define MAX_CPUS_IN_CLUSTER 4
+#define ENYNOS_PMU_CPUNR(mpidr) \
+ ((MPIDR_AFFINITY_LEVEL(mpidr, 1) * MAX_CPUS_IN_CLUSTER) \
+ + MPIDR_AFFINITY_LEVEL(mpidr, 0));
Static inline would be preferred and then name in lowercase.
Best regards,
Tomasz
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