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ARM: EXYNOS: Add support for firmware-assisted suspend/resume

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On a numer of Exynos-based boards Linux kernel is running in non-secure
mode under a secure firmware. This means that certain operations need to
be handled in special way, with firmware assistance. System-wide
suspend/resume is an example of such operations.

This patch adds support for firmware-assisted suspend/resume by
leveraging recently introduced suspend and resume firmware operations
and modifying existing suspend/resume paths to account for presence of
secure firmware.

Signed-off-by: Tomasz Figa <t.figa@samsung.com>
[kgene.kim@samsung.com: rebased]
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
This commit is contained in:
Tomasz Figa
2014-09-24 01:24:39 +09:00
committed by Kukjin Kim
parent 9c261f89a3
commit 2b9d9c321b
6 changed files with 93 additions and 5 deletions
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45
arch/arm/mach-exynos/firmware.c
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@@ -14,13 +14,20 @@
#include <linux/of.h>
#include <linux/of_address.h>
#include <asm/cacheflush.h>
#include <asm/cputype.h>
#include <asm/firmware.h>
#include <asm/suspend.h>
#include <mach/map.h>
#include "common.h"
#include "smc.h"
#define EXYNOS_SLEEP_MAGIC 0x00000bad
#define EXYNOS_BOOT_ADDR 0x8
#define EXYNOS_BOOT_FLAG 0xc
static int exynos_do_idle(void)
{
exynos_smc(SMC_CMD_SLEEP, 0, 0, 0);
@@ -69,10 +76,48 @@ static int exynos_set_cpu_boot_addr(int cpu, unsigned long boot_addr)
return 0;
}
static int exynos_cpu_suspend(unsigned long arg)
{
flush_cache_all();
outer_flush_all();
exynos_smc(SMC_CMD_SLEEP, 0, 0, 0);
pr_info("Failed to suspend the system\n");
writel(0, sysram_ns_base_addr + EXYNOS_BOOT_FLAG);
return 1;
}
static int exynos_suspend(void)
{
if (read_cpuid_part() == ARM_CPU_PART_CORTEX_A9) {
/* Save Power control and Diagnostic registers */
asm ("mrc p15, 0, %0, c15, c0, 0\n"
"mrc p15, 0, %1, c15, c0, 1\n"
: "=r" (cp15_save_power), "=r" (cp15_save_diag)
: : "cc");
}
writel(EXYNOS_SLEEP_MAGIC, sysram_ns_base_addr + EXYNOS_BOOT_FLAG);
writel(virt_to_phys(exynos_cpu_resume_ns),
sysram_ns_base_addr + EXYNOS_BOOT_ADDR);
return cpu_suspend(0, exynos_cpu_suspend);
}
static int exynos_resume(void)
{
writel(0, sysram_ns_base_addr + EXYNOS_BOOT_FLAG);
return 0;
}
static const struct firmware_ops exynos_firmware_ops = {
.do_idle = exynos_do_idle,
.set_cpu_boot_addr = exynos_set_cpu_boot_addr,
.cpu_boot = exynos_cpu_boot,
.suspend = exynos_suspend,
.resume = exynos_resume,
};
void __init exynos_firmware_init(void)