arch/powerpc/platforms/8xx/cpm1.c

Source file repositories/reference/linux-study-clean/arch/powerpc/platforms/8xx/cpm1.c

File Facts

System
Linux kernel
Corpus path
arch/powerpc/platforms/8xx/cpm1.c
Extension
.c
Size
16070 bytes
Lines
669
Domain
Architecture Layer
Bucket
arch/powerpc
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 cpm_ioport16 {
	__be16 dir, par, odr_sor, dat, intr;
	__be16 res[3];
};

struct cpm_ioport32b {
	__be32 dir, par, odr, dat;
};

struct cpm_ioport32e {
	__be32 dir, par, sor, odr, dat;
};

static void __init cpm1_set_pin32(int port, int pin, int flags)
{
	struct cpm_ioport32e __iomem *iop;
	pin = 1 << (31 - pin);

	if (port == CPM_PORTB)
		iop = (struct cpm_ioport32e __iomem *)
		      &mpc8xx_immr->im_cpm.cp_pbdir;
	else
		iop = (struct cpm_ioport32e __iomem *)
		      &mpc8xx_immr->im_cpm.cp_pedir;

	if (flags & CPM_PIN_OUTPUT)
		setbits32(&iop->dir, pin);
	else
		clrbits32(&iop->dir, pin);

	if (!(flags & CPM_PIN_GPIO))
		setbits32(&iop->par, pin);
	else
		clrbits32(&iop->par, pin);

	if (port == CPM_PORTB) {
		if (flags & CPM_PIN_OPENDRAIN)
			setbits16(&mpc8xx_immr->im_cpm.cp_pbodr, pin);
		else
			clrbits16(&mpc8xx_immr->im_cpm.cp_pbodr, pin);
	}

	if (port == CPM_PORTE) {
		if (flags & CPM_PIN_SECONDARY)
			setbits32(&iop->sor, pin);
		else
			clrbits32(&iop->sor, pin);

		if (flags & CPM_PIN_OPENDRAIN)
			setbits32(&mpc8xx_immr->im_cpm.cp_peodr, pin);
		else
			clrbits32(&mpc8xx_immr->im_cpm.cp_peodr, pin);
	}
}

static void __init cpm1_set_pin16(int port, int pin, int flags)
{
	struct cpm_ioport16 __iomem *iop =
		(struct cpm_ioport16 __iomem *)&mpc8xx_immr->im_ioport;

	pin = 1 << (15 - pin);

	if (port != 0)
		iop += port - 1;

	if (flags & CPM_PIN_OUTPUT)
		setbits16(&iop->dir, pin);
	else
		clrbits16(&iop->dir, pin);

	if (!(flags & CPM_PIN_GPIO))
		setbits16(&iop->par, pin);
	else
		clrbits16(&iop->par, pin);

	if (port == CPM_PORTA) {
		if (flags & CPM_PIN_OPENDRAIN)
			setbits16(&iop->odr_sor, pin);
		else
			clrbits16(&iop->odr_sor, pin);
	}
	if (port == CPM_PORTC) {
		if (flags & CPM_PIN_SECONDARY)
			setbits16(&iop->odr_sor, pin);
		else
			clrbits16(&iop->odr_sor, pin);
		if (flags & CPM_PIN_FALLEDGE)
			setbits16(&iop->intr, pin);
		else
			clrbits16(&iop->intr, pin);

Annotation

Implementation Notes