arch/arm/mach-omap2/pm33xx-core.c

Source file repositories/reference/linux-study-clean/arch/arm/mach-omap2/pm33xx-core.c

File Facts

System
Linux kernel
Corpus path
arch/arm/mach-omap2/pm33xx-core.c
Extension
.c
Size
9881 bytes
Lines
443
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

struct amx3_idle_state {
	int wfi_flags;
};

static struct amx3_idle_state *idle_states;

static int am43xx_map_scu(void)
{
	scu_base = ioremap(scu_a9_get_base(), SZ_256);

	if (!scu_base)
		return -ENOMEM;

	return 0;
}

static int am33xx_check_off_mode_enable(void)
{
	if (enable_off_mode)
		pr_warn("WARNING: This platform does not support off-mode, entering DeepSleep suspend.\n");

	/* off mode not supported on am335x so return 0 always */
	return 0;
}

static int am43xx_check_off_mode_enable(void)
{
	/*
	 * Check for am437x-gp-evm which has the right Hardware design to
	 * support this mode reliably.
	 */
	if (of_machine_is_compatible("ti,am437x-gp-evm") && enable_off_mode)
		return enable_off_mode;
	else if (enable_off_mode)
		pr_warn("WARNING: This platform does not support off-mode, entering DeepSleep suspend.\n");

	return 0;
}

static int amx3_common_init(int (*idle)(u32 wfi_flags))
{
	gfx_pwrdm = pwrdm_lookup("gfx_pwrdm");
	per_pwrdm = pwrdm_lookup("per_pwrdm");
	mpu_pwrdm = pwrdm_lookup("mpu_pwrdm");

	if ((!gfx_pwrdm) || (!per_pwrdm) || (!mpu_pwrdm))
		return -ENODEV;

	(void)clkdm_for_each(omap_pm_clkdms_setup, NULL);

	/* CEFUSE domain can be turned off post bootup */
	cefuse_pwrdm = pwrdm_lookup("cefuse_pwrdm");
	if (!cefuse_pwrdm)
		pr_err("PM: Failed to get cefuse_pwrdm\n");
	else if (omap_type() != OMAP2_DEVICE_TYPE_GP)
		pr_info("PM: Leaving EFUSE power domain active\n");
	else
		omap_set_pwrdm_state(cefuse_pwrdm, PWRDM_POWER_OFF);

	idle_fn = idle;

	return 0;
}

static int am33xx_suspend_init(int (*idle)(u32 wfi_flags))
{
	gfx_l4ls_clkdm = clkdm_lookup("gfx_l4ls_gfx_clkdm");

	if (!gfx_l4ls_clkdm) {
		pr_err("PM: Cannot lookup gfx_l4ls_clkdm clockdomains\n");
		return -ENODEV;
	}

	return amx3_common_init(idle);
}

static int am43xx_suspend_init(int (*idle)(u32 wfi_flags))
{
	int ret = 0;

	ret = am43xx_map_scu();
	if (ret) {
		pr_err("PM: Could not ioremap SCU\n");
		return ret;
	}

	ret = amx3_common_init(idle);

	return ret;
}

Annotation

Implementation Notes