arch/arm/mach-s3c/pm-s3c64xx.c

Source file repositories/reference/linux-study-clean/arch/arm/mach-s3c/pm-s3c64xx.c

File Facts

System
Linux kernel
Corpus path
arch/arm/mach-s3c/pm-s3c64xx.c
Extension
.c
Size
7279 bytes
Lines
318
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 s3c64xx_pm_domain {
	char *const name;
	u32 ena;
	u32 pwr_stat;
	struct generic_pm_domain pd;
};

static int s3c64xx_pd_off(struct generic_pm_domain *domain)
{
	struct s3c64xx_pm_domain *pd;
	u32 val;

	pd = container_of(domain, struct s3c64xx_pm_domain, pd);

	val = __raw_readl(S3C64XX_NORMAL_CFG);
	val &= ~(pd->ena);
	__raw_writel(val, S3C64XX_NORMAL_CFG);

	return 0;
}

static int s3c64xx_pd_on(struct generic_pm_domain *domain)
{
	struct s3c64xx_pm_domain *pd;
	u32 val;
	long retry = 1000000L;

	pd = container_of(domain, struct s3c64xx_pm_domain, pd);

	val = __raw_readl(S3C64XX_NORMAL_CFG);
	val |= pd->ena;
	__raw_writel(val, S3C64XX_NORMAL_CFG);

	/* Not all domains provide power status readback */
	if (pd->pwr_stat) {
		do {
			cpu_relax();
			if (__raw_readl(S3C64XX_BLK_PWR_STAT) & pd->pwr_stat)
				break;
		} while (retry--);

		if (!retry) {
			pr_err("Failed to start domain %s\n", pd->name);
			return -EBUSY;
		}
	}

	return 0;
}

static struct s3c64xx_pm_domain s3c64xx_pm_irom = {
	.name = "IROM",
	.ena = S3C64XX_NORMALCFG_IROM_ON,
	.pd = {
		.power_off = s3c64xx_pd_off,
		.power_on = s3c64xx_pd_on,
	},
};

static struct s3c64xx_pm_domain s3c64xx_pm_etm = {
	.name = "ETM",
	.ena = S3C64XX_NORMALCFG_DOMAIN_ETM_ON,
	.pwr_stat = S3C64XX_BLKPWRSTAT_ETM,
	.pd = {
		.power_off = s3c64xx_pd_off,
		.power_on = s3c64xx_pd_on,
	},
};

static struct s3c64xx_pm_domain s3c64xx_pm_s = {
	.name = "S",
	.ena = S3C64XX_NORMALCFG_DOMAIN_S_ON,
	.pwr_stat = S3C64XX_BLKPWRSTAT_S,
	.pd = {
		.power_off = s3c64xx_pd_off,
		.power_on = s3c64xx_pd_on,
	},
};

static struct s3c64xx_pm_domain s3c64xx_pm_f = {
	.name = "F",
	.ena = S3C64XX_NORMALCFG_DOMAIN_F_ON,
	.pwr_stat = S3C64XX_BLKPWRSTAT_F,
	.pd = {
		.power_off = s3c64xx_pd_off,
		.power_on = s3c64xx_pd_on,
	},
};

static struct s3c64xx_pm_domain s3c64xx_pm_p = {

Annotation

Implementation Notes