arch/arm/mach-omap1/id.c

Source file repositories/reference/linux-study-clean/arch/arm/mach-omap1/id.c

File Facts

System
Linux kernel
Corpus path
arch/arm/mach-omap1/id.c
Extension
.c
Size
6373 bytes
Lines
207
Domain
Architecture Layer
Bucket
arch/arm
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 omap_id {
	u16	jtag_id;	/* Used to determine OMAP type */
	u8	die_rev;	/* Processor revision */
	u32	omap_id;	/* OMAP revision */
	u32	type;		/* Cpu id bits [31:08], cpu class bits [07:00] */
};

static unsigned int omap_revision;

/* Register values to detect the OMAP version */
static struct omap_id omap_ids[] __initdata = {
	{ .jtag_id = 0xb574, .die_rev = 0x2, .omap_id = 0x03310315, .type = 0x03100000},
	{ .jtag_id = 0x355f, .die_rev = 0x0, .omap_id = 0x03320000, .type = 0x07300100},
	{ .jtag_id = 0xb55f, .die_rev = 0x0, .omap_id = 0x03320000, .type = 0x07300300},
	{ .jtag_id = 0xb62c, .die_rev = 0x1, .omap_id = 0x03320500, .type = 0x08500000},
	{ .jtag_id = 0xb470, .die_rev = 0x0, .omap_id = 0x03310100, .type = 0x15100000},
	{ .jtag_id = 0xb576, .die_rev = 0x0, .omap_id = 0x03320000, .type = 0x16100000},
	{ .jtag_id = 0xb576, .die_rev = 0x2, .omap_id = 0x03320100, .type = 0x16110000},
	{ .jtag_id = 0xb576, .die_rev = 0x3, .omap_id = 0x03320100, .type = 0x16100c00},
	{ .jtag_id = 0xb576, .die_rev = 0x0, .omap_id = 0x03320200, .type = 0x16100d00},
	{ .jtag_id = 0xb613, .die_rev = 0x0, .omap_id = 0x03320300, .type = 0x1610ef00},
	{ .jtag_id = 0xb613, .die_rev = 0x0, .omap_id = 0x03320300, .type = 0x1610ef00},
	{ .jtag_id = 0xb576, .die_rev = 0x1, .omap_id = 0x03320100, .type = 0x16110000},
	{ .jtag_id = 0xb58c, .die_rev = 0x2, .omap_id = 0x03320200, .type = 0x16110b00},
	{ .jtag_id = 0xb58c, .die_rev = 0x3, .omap_id = 0x03320200, .type = 0x16110c00},
	{ .jtag_id = 0xb65f, .die_rev = 0x0, .omap_id = 0x03320400, .type = 0x16212300},
	{ .jtag_id = 0xb65f, .die_rev = 0x1, .omap_id = 0x03320400, .type = 0x16212300},
	{ .jtag_id = 0xb65f, .die_rev = 0x1, .omap_id = 0x03320500, .type = 0x16212300},
	{ .jtag_id = 0xb5f7, .die_rev = 0x0, .omap_id = 0x03330000, .type = 0x17100000},
	{ .jtag_id = 0xb5f7, .die_rev = 0x1, .omap_id = 0x03330100, .type = 0x17100000},
	{ .jtag_id = 0xb5f7, .die_rev = 0x2, .omap_id = 0x03330100, .type = 0x17100000},
};

unsigned int omap_rev(void)
{
	return omap_revision;
}
EXPORT_SYMBOL(omap_rev);

/*
 * Get OMAP type from PROD_ID.
 * 1710 has the PROD_ID in bits 15:00, not in 16:01 as documented in TRM.
 * 1510 PROD_ID is empty, and 1610 PROD_ID does not make sense.
 * Undocumented register in TEST BLOCK is used as fallback; This seems to
 * work on 1510, 1610 & 1710. The official way hopefully will work in future
 * processors.
 */
static u16 __init omap_get_jtag_id(void)
{
	u32 prod_id, omap_id;

	prod_id = omap_readl(OMAP_PRODUCTION_ID_1);
	omap_id = omap_readl(OMAP32_ID_1);

	/* Check for unusable OMAP_PRODUCTION_ID_1 on 1611B/5912 and 730/850 */
	if (((prod_id >> 20) == 0) || (prod_id == omap_id))
		prod_id = 0;
	else
		prod_id &= 0xffff;

	if (prod_id)
		return prod_id;

	/* Use OMAP32_ID_1 as fallback */
	prod_id = ((omap_id >> 12) & 0xffff);

	return prod_id;
}

/*
 * Get OMAP revision from DIE_REV.
 * Early 1710 processors may have broken OMAP_DIE_ID, it contains PROD_ID.
 * Undocumented register in the TEST BLOCK is used as fallback.
 * REVISIT: This does not seem to work on 1510
 */
static u8 __init omap_get_die_rev(void)
{
	u32 die_rev;

	die_rev = omap_readl(OMAP_DIE_ID_1);

	/* Check for broken OMAP_DIE_ID on early 1710 */
	if (((die_rev >> 12) & 0xffff) == omap_get_jtag_id())
		die_rev = 0;

	die_rev = (die_rev >> 17) & 0xf;
	if (die_rev)
		return die_rev;

	die_rev = (omap_readl(OMAP32_ID_1) >> 28) & 0xf;

Annotation

Implementation Notes