arch/arm/mach-exynos/firmware.c

Source file repositories/reference/linux-study-clean/arch/arm/mach-exynos/firmware.c

File Facts

System
Linux kernel
Corpus path
arch/arm/mach-exynos/firmware.c
Extension
.c
Size
6327 bytes
Lines
262
Domain
Architecture Layer
Bucket
arch/arm
Inferred role
Architecture Layer: implementation source
Status
source implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

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,
				   SMC_POWERSTATE_IDLE, 0);
		} else
			exynos_smc(SMC_CMD_CPU0AFTR, 0, 0, 0);
		break;
	case FW_DO_IDLE_SLEEP:
		exynos_smc(SMC_CMD_SLEEP, 0, 0, 0);
	}
	return 0;
}

static int exynos_cpu_boot(int cpu)
{
	/*
	 * Exynos3250 doesn't need to send smc command for secondary CPU boot
	 * because Exynos3250 removes WFE in secure mode.
	 *
	 * On most Exynos5 devices the call is ignored by trustzone firmware.
	 */
	if (!soc_is_exynos4210() && !soc_is_exynos4212() &&
	    !soc_is_exynos4412() && !of_machine_is_compatible("google,manta"))
		return 0;

	/*
	 * The second parameter of SMC_CMD_CPU1BOOT command means CPU id.
	 * But, Exynos4212 has only one secondary CPU so second parameter
	 * isn't used for informing secure firmware about CPU id.
	 */
	if (soc_is_exynos4212())
		cpu = 0;

	exynos_smc(SMC_CMD_CPU1BOOT, cpu, 0, 0);
	return 0;
}

static int exynos_set_cpu_boot_addr(int cpu, unsigned long boot_addr)
{
	void __iomem *boot_reg;

	if (!sysram_ns_base_addr)
		return -ENODEV;

	boot_reg = sysram_ns_base_addr + 0x1c;

	/*
	 * Almost all Exynos-series of SoCs that run in secure mode don't need
	 * additional offset for every CPU, with Exynos4412 being the only
	 * exception.
	 */
	if (soc_is_exynos4412())
		boot_reg += 4 * cpu;

	writel_relaxed(boot_addr, boot_reg);
	return 0;
}

static int exynos_get_cpu_boot_addr(int cpu, unsigned long *boot_addr)
{
	void __iomem *boot_reg;

	if (!sysram_ns_base_addr)
		return -ENODEV;

	boot_reg = sysram_ns_base_addr + 0x1c;

	if (soc_is_exynos4412())
		boot_reg += 4 * cpu;

	*boot_addr = readl_relaxed(boot_reg);
	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)
{

Annotation

Implementation Notes