arch/mips/bcm63xx/clk.c

Source file repositories/reference/linux-study-clean/arch/mips/bcm63xx/clk.c

File Facts

System
Linux kernel
Corpus path
arch/mips/bcm63xx/clk.c
Extension
.c
Size
12981 bytes
Lines
580
Domain
Architecture Layer
Bucket
arch/mips
Inferred role
Architecture Layer: exported/initcall integration point
Status
integration 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 clk {
	void		(*set)(struct clk *, int);
	unsigned int	rate;
	unsigned int	usage;
	int		id;
};

static DEFINE_MUTEX(clocks_mutex);


static void clk_enable_unlocked(struct clk *clk)
{
	if (clk->set && (clk->usage++) == 0)
		clk->set(clk, 1);
}

static void clk_disable_unlocked(struct clk *clk)
{
	if (clk->set && (--clk->usage) == 0)
		clk->set(clk, 0);
}

static void bcm_hwclock_set(u32 mask, int enable)
{
	u32 reg;

	reg = bcm_perf_readl(PERF_CKCTL_REG);
	if (enable)
		reg |= mask;
	else
		reg &= ~mask;
	bcm_perf_writel(reg, PERF_CKCTL_REG);
}

/*
 * Ethernet MAC "misc" clock: dma clocks and main clock on 6348
 */
static void enet_misc_set(struct clk *clk, int enable)
{
	u32 mask;

	if (BCMCPU_IS_6338())
		mask = CKCTL_6338_ENET_EN;
	else if (BCMCPU_IS_6345())
		mask = CKCTL_6345_ENET_EN;
	else if (BCMCPU_IS_6348())
		mask = CKCTL_6348_ENET_EN;
	else
		/* BCMCPU_IS_6358 */
		mask = CKCTL_6358_EMUSB_EN;
	bcm_hwclock_set(mask, enable);
}

static struct clk clk_enet_misc = {
	.set	= enet_misc_set,
};

/*
 * Ethernet MAC clocks: only relevant on 6358, silently enable misc
 * clocks
 */
static void enetx_set(struct clk *clk, int enable)
{
	if (enable)
		clk_enable_unlocked(&clk_enet_misc);
	else
		clk_disable_unlocked(&clk_enet_misc);

	if (BCMCPU_IS_3368() || BCMCPU_IS_6358()) {
		u32 mask;

		if (clk->id == 0)
			mask = CKCTL_6358_ENET0_EN;
		else
			mask = CKCTL_6358_ENET1_EN;
		bcm_hwclock_set(mask, enable);
	}
}

static struct clk clk_enet0 = {
	.id	= 0,
	.set	= enetx_set,
};

static struct clk clk_enet1 = {
	.id	= 1,
	.set	= enetx_set,
};

/*

Annotation

Implementation Notes