arch/arm/mach-omap2/clockdomain.c

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

File Facts

System
Linux kernel
Corpus path
arch/arm/mach-omap2/clockdomain.c
Extension
.c
Size
36985 bytes
Lines
1302
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 (!strcmp(name, temp_clkdm->name)) {
			clkdm = temp_clkdm;
			break;
		}
	}

	return clkdm;
}

/**
 * _clkdm_register - register a clockdomain
 * @clkdm: struct clockdomain * to register
 *
 * Adds a clockdomain to the internal clockdomain list.
 * Returns -EINVAL if given a null pointer, -EEXIST if a clockdomain is
 * already registered by the provided name, or 0 upon success.
 */
static int _clkdm_register(struct clockdomain *clkdm)
{
	struct powerdomain *pwrdm;

	if (!clkdm || !clkdm->name)
		return -EINVAL;

	pwrdm = pwrdm_lookup(clkdm->pwrdm.name);
	if (!pwrdm) {
		pr_err("clockdomain: %s: powerdomain %s does not exist\n",
			clkdm->name, clkdm->pwrdm.name);
		return -EINVAL;
	}
	clkdm->pwrdm.ptr = pwrdm;

	/* Verify that the clockdomain is not already registered */
	if (_clkdm_lookup(clkdm->name))
		return -EEXIST;

	list_add(&clkdm->node, &clkdm_list);

	pwrdm_add_clkdm(pwrdm, clkdm);

	pr_debug("clockdomain: registered %s\n", clkdm->name);

	return 0;
}

/* _clkdm_deps_lookup - look up the specified clockdomain in a clkdm list */
static struct clkdm_dep *_clkdm_deps_lookup(struct clockdomain *clkdm,
					    struct clkdm_dep *deps)
{
	struct clkdm_dep *cd;

	if (!clkdm || !deps)
		return ERR_PTR(-EINVAL);

	for (cd = deps; cd->clkdm_name; cd++) {
		if (!cd->clkdm && cd->clkdm_name)
			cd->clkdm = _clkdm_lookup(cd->clkdm_name);

		if (cd->clkdm == clkdm)
			break;
	}

	if (!cd->clkdm_name)
		return ERR_PTR(-ENOENT);

	return cd;
}

/**
 * _autodep_lookup - resolve autodep clkdm names to clkdm pointers; store
 * @autodep: struct clkdm_autodep * to resolve
 *
 * Resolve autodep clockdomain names to clockdomain pointers via
 * clkdm_lookup() and store the pointers in the autodep structure.  An
 * "autodep" is a clockdomain sleep/wakeup dependency that is
 * automatically added and removed whenever clocks in the associated
 * clockdomain are enabled or disabled (respectively) when the
 * clockdomain is in hardware-supervised mode.	Meant to be called
 * once at clockdomain layer initialization, since these should remain
 * fixed for a particular architecture.  No return value.
 *
 * XXX autodeps are deprecated and should be removed at the earliest
 * opportunity
 */
static void _autodep_lookup(struct clkdm_autodep *autodep)
{
	struct clockdomain *clkdm;

	if (!autodep)
		return;

Annotation

Implementation Notes