arch/powerpc/sysdev/fsl_pmc.c

Source file repositories/reference/linux-study-clean/arch/powerpc/sysdev/fsl_pmc.c

File Facts

System
Linux kernel
Corpus path
arch/powerpc/sysdev/fsl_pmc.c
Extension
.c
Size
1782 bytes
Lines
85
Domain
Architecture Layer
Bucket
arch/powerpc
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 pmc_regs {
	__be32 devdisr;
	__be32 devdisr2;
	__be32 :32;
	__be32 :32;
	__be32 pmcsr;
#define PMCSR_SLP	(1 << 17)
};

static struct device *pmc_dev;
static struct pmc_regs __iomem *pmc_regs;

static int pmc_suspend_enter(suspend_state_t state)
{
	int ret;

	setbits32(&pmc_regs->pmcsr, PMCSR_SLP);
	/* At this point, the CPU is asleep. */

	/* Upon resume, wait for SLP bit to be clear. */
	ret = spin_event_timeout((in_be32(&pmc_regs->pmcsr) & PMCSR_SLP) == 0,
				 10000, 10) ? 0 : -ETIMEDOUT;
	if (ret)
		dev_err(pmc_dev, "tired waiting for SLP bit to clear\n");
	return ret;
}

static int pmc_suspend_valid(suspend_state_t state)
{
	if (state != PM_SUSPEND_STANDBY)
		return 0;
	return 1;
}

static const struct platform_suspend_ops pmc_suspend_ops = {
	.valid = pmc_suspend_valid,
	.enter = pmc_suspend_enter,
};

static int pmc_probe(struct platform_device *ofdev)
{
	pmc_regs = of_iomap(ofdev->dev.of_node, 0);
	if (!pmc_regs)
		return -ENOMEM;

	pmc_dev = &ofdev->dev;
	suspend_set_ops(&pmc_suspend_ops);
	return 0;
}

static const struct of_device_id pmc_ids[] = {
	{ .compatible = "fsl,mpc8548-pmc", },
	{ .compatible = "fsl,mpc8641d-pmc", },
	{ },
};

static struct platform_driver pmc_driver = {
	.driver = {
		.name = "fsl-pmc",
		.of_match_table = pmc_ids,
	},
	.probe = pmc_probe,
};

builtin_platform_driver(pmc_driver);

Annotation

Implementation Notes