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ARM: EXYNOS: SWRESET is needed to boot secondary CPU on exynos3250 

Without software reset the secondary CPU does not power up and
exynos_boot_secondary() ends with pen_release equal to 1. This can be
observed in dmesg:
	CPU1: failed to come online
	Brought up 1 CPUs
	SMP: Total of 1 processors activated.
	CPU: All CPU(s) started in SVC mode.

When booting the secondary CPU on Exynos3250 execute also software
reset for core 1.

Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Reviewed-by: Tomasz Figa <t.figa@samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
This commit is contained in:
Krzysztof Kozlowski 2014-09-25 18:15:13 +09:00 committed by Kukjin Kim
parent 0d713cf1a6
commit b588aaec6d
2 changed files with 25 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

23
arch/arm/mach-exynos/platsmp.c
View File

@ -120,6 +120,26 @@ static inline void __iomem *cpu_boot_reg(int cpu)
return boot_reg;
}
/*
* Set wake up by local power mode and execute software reset for given core.
*
* Currently this is needed only when booting secondary CPU on Exynos3250.
*/
static void exynos_core_restart(u32 core_id)
{
u32 val;
if (!of_machine_is_compatible("samsung,exynos3250"))
return;
val = pmu_raw_readl(EXYNOS_ARM_CORE_STATUS(core_id));
val |= S5P_CORE_WAKEUP_FROM_LOCAL_CFG;
pmu_raw_writel(val, EXYNOS_ARM_CORE_STATUS(core_id));
pr_info("CPU%u: Software reset\n", core_id);
pmu_raw_writel(EXYNOS_CORE_PO_RESET(core_id), EXYNOS_SWRESET);
}
/*
* Write pen_release in a way that is guaranteed to be visible to all
* observers, irrespective of whether they're taking part in coherency
@ -196,6 +216,9 @@ static int exynos_boot_secondary(unsigned int cpu, struct task_struct *idle)
return -ETIMEDOUT;
}
}
exynos_core_restart(core_id);
/*
* Send the secondary CPU a soft interrupt, thereby causing
* the boot monitor to read the system wide flags register,

2
arch/arm/mach-exynos/regs-pmu.h
View File

@ -21,6 +21,7 @@
#define S5P_USE_STANDBY_WFI0 (1 << 16)
#define S5P_USE_STANDBY_WFE0 (1 << 24)
#define EXYNOS_CORE_PO_RESET(n) ((1 << 4) << n)
#define EXYNOS_WAKEUP_FROM_LOWPWR (1 << 28)
#define EXYNOS_SWRESET 0x0400
#define EXYNOS5440_SWRESET 0x00C4
@ -125,6 +126,7 @@
#define S5P_PAD_RET_EBIB_OPTION 0x31A8
#define S5P_CORE_LOCAL_PWR_EN 0x3
#define S5P_CORE_WAKEUP_FROM_LOCAL_CFG (0x3 << 8)
/* Only for EXYNOS4210 */
#define S5P_CMU_CLKSTOP_LCD1_LOWPWR 0x1154