Linux-2.6.33.2/arch/arm/mach-omap2/id.c
/*
* linux/arch/arm/mach-omap2/id.c
*
* OMAP2 CPU identification code
*
* Copyright (C) 2005 Nokia Corporation
* Written by Tony Lindgren <tony@atomide.com>
*
* Copyright (C) 2009 Texas Instruments
* Added OMAP4 support - Santosh Shilimkar <santosh.shilimkar@ti.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/io.h>
#include <asm/cputype.h>
#include <plat/common.h>
#include <plat/control.h>
#include <plat/cpu.h>
static struct omap_chip_id omap_chip;
static unsigned int omap_revision;
u32 omap3_features;
unsigned int omap_rev(void)
{
return omap_revision;
}
EXPORT_SYMBOL(omap_rev);
/**
* omap_chip_is - test whether currently running OMAP matches a chip type
* @oc: omap_chip_t to test against
*
* Test whether the currently-running OMAP chip matches the supplied
* chip type 'oc'. Returns 1 upon a match; 0 upon failure.
*/
int omap_chip_is(struct omap_chip_id oci)
{
return (oci.oc & omap_chip.oc) ? 1 : 0;
}
EXPORT_SYMBOL(omap_chip_is);
int omap_type(void)
{
u32 val = 0;
if (cpu_is_omap24xx()) {
val = omap_ctrl_readl(OMAP24XX_CONTROL_STATUS);
} else if (cpu_is_omap34xx()) {
val = omap_ctrl_readl(OMAP343X_CONTROL_STATUS);
} else {
pr_err("Cannot detect omap type!\n");
goto out;
}
val &= OMAP2_DEVICETYPE_MASK;
val >>= 8;
out:
return val;
}
EXPORT_SYMBOL(omap_type);
/*----------------------------------------------------------------------------*/
#define OMAP_TAP_IDCODE 0x0204
#define OMAP_TAP_DIE_ID_0 0x0218
#define OMAP_TAP_DIE_ID_1 0x021C
#define OMAP_TAP_DIE_ID_2 0x0220
#define OMAP_TAP_DIE_ID_3 0x0224
#define read_tap_reg(reg) __raw_readl(tap_base + (reg))
struct omap_id {
u16 hawkeye; /* Silicon type (Hawkeye id) */
u8 dev; /* Device type from production_id reg */
u32 type; /* Combined type id copied to omap_revision */
};
/* Register values to detect the OMAP version */
static struct omap_id omap_ids[] __initdata = {
{ .hawkeye = 0xb5d9, .dev = 0x0, .type = 0x24200024 },
{ .hawkeye = 0xb5d9, .dev = 0x1, .type = 0x24201024 },
{ .hawkeye = 0xb5d9, .dev = 0x2, .type = 0x24202024 },
{ .hawkeye = 0xb5d9, .dev = 0x4, .type = 0x24220024 },
{ .hawkeye = 0xb5d9, .dev = 0x8, .type = 0x24230024 },
{ .hawkeye = 0xb68a, .dev = 0x0, .type = 0x24300024 },
};
static void __iomem *tap_base;
static u16 tap_prod_id;
void __init omap24xx_check_revision(void)
{
int i, j;
u32 idcode, prod_id;
u16 hawkeye;
u8 dev_type, rev;
idcode = read_tap_reg(OMAP_TAP_IDCODE);
prod_id = read_tap_reg(tap_prod_id);
hawkeye = (idcode >> 12) & 0xffff;
rev = (idcode >> 28) & 0x0f;
dev_type = (prod_id >> 16) & 0x0f;
pr_debug("OMAP_TAP_IDCODE 0x%08x REV %i HAWKEYE 0x%04x MANF %03x\n",
idcode, rev, hawkeye, (idcode >> 1) & 0x7ff);
pr_debug("OMAP_TAP_DIE_ID_0: 0x%08x\n",
read_tap_reg(OMAP_TAP_DIE_ID_0));
pr_debug("OMAP_TAP_DIE_ID_1: 0x%08x DEV_REV: %i\n",
read_tap_reg(OMAP_TAP_DIE_ID_1),
(read_tap_reg(OMAP_TAP_DIE_ID_1) >> 28) & 0xf);
pr_debug("OMAP_TAP_DIE_ID_2: 0x%08x\n",
read_tap_reg(OMAP_TAP_DIE_ID_2));
pr_debug("OMAP_TAP_DIE_ID_3: 0x%08x\n",
read_tap_reg(OMAP_TAP_DIE_ID_3));
pr_debug("OMAP_TAP_PROD_ID_0: 0x%08x DEV_TYPE: %i\n",
prod_id, dev_type);
/* Check hawkeye ids */
for (i = 0; i < ARRAY_SIZE(omap_ids); i++) {
if (hawkeye == omap_ids[i].hawkeye)
break;
}
if (i == ARRAY_SIZE(omap_ids)) {
printk(KERN_ERR "Unknown OMAP CPU id\n");
return;
}
for (j = i; j < ARRAY_SIZE(omap_ids); j++) {
if (dev_type == omap_ids[j].dev)
break;
}
if (j == ARRAY_SIZE(omap_ids)) {
printk(KERN_ERR "Unknown OMAP device type. "
"Handling it as OMAP%04x\n",
omap_ids[i].type >> 16);
j = i;
}
pr_info("OMAP%04x", omap_rev() >> 16);
if ((omap_rev() >> 8) & 0x0f)
pr_info("ES%x", (omap_rev() >> 12) & 0xf);
pr_info("\n");
}
#define OMAP3_CHECK_FEATURE(status,feat) \
if (((status & OMAP3_ ##feat## _MASK) \
>> OMAP3_ ##feat## _SHIFT) != FEAT_ ##feat## _NONE) { \
omap3_features |= OMAP3_HAS_ ##feat; \
}
void __init omap3_check_features(void)
{
u32 status;
omap3_features = 0;
status = omap_ctrl_readl(OMAP3_CONTROL_OMAP_STATUS);
OMAP3_CHECK_FEATURE(status, L2CACHE);
OMAP3_CHECK_FEATURE(status, IVA);
OMAP3_CHECK_FEATURE(status, SGX);
OMAP3_CHECK_FEATURE(status, NEON);
OMAP3_CHECK_FEATURE(status, ISP);
/*
* TODO: Get additional info (where applicable)
* e.g. Size of L2 cache.
*/
}
void __init omap3_check_revision(void)
{
u32 cpuid, idcode;
u16 hawkeye;
u8 rev;
omap_chip.oc = CHIP_IS_OMAP3430;
/*
* We cannot access revision registers on ES1.0.
* If the processor type is Cortex-A8 and the revision is 0x0
* it means its Cortex r0p0 which is 3430 ES1.0.
*/
cpuid = read_cpuid(CPUID_ID);
if ((((cpuid >> 4) & 0xfff) == 0xc08) && ((cpuid & 0xf) == 0x0)) {
omap_revision = OMAP3430_REV_ES1_0;
omap_chip.oc |= CHIP_IS_OMAP3430ES1;
return;
}
/*
* Detection for 34xx ES2.0 and above can be done with just
* hawkeye and rev. See TRM 1.5.2 Device Identification.
* Note that rev does not map directly to our defined processor
* revision numbers as ES1.0 uses value 0.
*/
idcode = read_tap_reg(OMAP_TAP_IDCODE);
hawkeye = (idcode >> 12) & 0xffff;
rev = (idcode >> 28) & 0xff;
switch (hawkeye) {
case 0xb7ae:
/* Handle 34xx/35xx devices */
switch (rev) {
case 0: /* Take care of early samples */
case 1:
omap_revision = OMAP3430_REV_ES2_0;
omap_chip.oc |= CHIP_IS_OMAP3430ES2;
break;
case 2:
omap_revision = OMAP3430_REV_ES2_1;
omap_chip.oc |= CHIP_IS_OMAP3430ES2;
break;
case 3:
omap_revision = OMAP3430_REV_ES3_0;
omap_chip.oc |= CHIP_IS_OMAP3430ES3_0;
break;
case 4:
omap_revision = OMAP3430_REV_ES3_1;
omap_chip.oc |= CHIP_IS_OMAP3430ES3_1;
break;
case 7:
/* FALLTHROUGH */
default:
/* Use the latest known revision as default */
omap_revision = OMAP3430_REV_ES3_1_2;
/* REVISIT: Add CHIP_IS_OMAP3430ES3_1_2? */
omap_chip.oc |= CHIP_IS_OMAP3430ES3_1;
}
break;
case 0xb868:
/* Handle OMAP35xx/AM35xx devices
*
* Set the device to be OMAP3505 here. Actual device
* is identified later based on the features.
*
* REVISIT: AM3505/AM3517 should have their own CHIP_IS
*/
omap_revision = OMAP3505_REV(rev);
omap_chip.oc |= CHIP_IS_OMAP3430ES3_1;
break;
case 0xb891:
/* FALLTHROUGH */
default:
/* Unknown default to latest silicon rev as default*/
omap_revision = OMAP3630_REV_ES1_0;
omap_chip.oc |= CHIP_IS_OMAP3630ES1;
}
}
void __init omap4_check_revision(void)
{
u32 idcode;
u16 hawkeye;
u8 rev;
char *rev_name = "ES1.0";
/*
* The IC rev detection is done with hawkeye and rev.
* Note that rev does not map directly to defined processor
* revision numbers as ES1.0 uses value 0.
*/
idcode = read_tap_reg(OMAP_TAP_IDCODE);
hawkeye = (idcode >> 12) & 0xffff;
rev = (idcode >> 28) & 0xff;
if ((hawkeye == 0xb852) && (rev == 0x0)) {
omap_revision = OMAP4430_REV_ES1_0;
pr_info("OMAP%04x %s\n", omap_rev() >> 16, rev_name);
return;
}
pr_err("Unknown OMAP4 CPU id\n");
}
#define OMAP3_SHOW_FEATURE(feat) \
if (omap3_has_ ##feat()) \
printk(#feat" ");
void __init omap3_cpuinfo(void)
{
u8 rev = GET_OMAP_REVISION();
char cpu_name[16], cpu_rev[16];
/* OMAP3430 and OMAP3530 are assumed to be same.
*
* OMAP3525, OMAP3515 and OMAP3503 can be detected only based
* on available features. Upon detection, update the CPU id
* and CPU class bits.
*/
if (cpu_is_omap3630()) {
strcpy(cpu_name, "OMAP3630");
} else if (cpu_is_omap3505()) {
/*
* AM35xx devices
*/
if (omap3_has_sgx()) {
omap_revision = OMAP3517_REV(rev);
strcpy(cpu_name, "AM3517");
} else {
/* Already set in omap3_check_revision() */
strcpy(cpu_name, "AM3505");
}
} else if (omap3_has_iva() && omap3_has_sgx()) {
/* OMAP3430, OMAP3525, OMAP3515, OMAP3503 devices */
strcpy(cpu_name, "OMAP3430/3530");
} else if (omap3_has_iva()) {
omap_revision = OMAP3525_REV(rev);
strcpy(cpu_name, "OMAP3525");
} else if (omap3_has_sgx()) {
omap_revision = OMAP3515_REV(rev);
strcpy(cpu_name, "OMAP3515");
} else {
omap_revision = OMAP3503_REV(rev);
strcpy(cpu_name, "OMAP3503");
}
switch (rev) {
case OMAP_REVBITS_00:
strcpy(cpu_rev, "1.0");
break;
case OMAP_REVBITS_10:
strcpy(cpu_rev, "2.0");
break;
case OMAP_REVBITS_20:
strcpy(cpu_rev, "2.1");
break;
case OMAP_REVBITS_30:
strcpy(cpu_rev, "3.0");
break;
case OMAP_REVBITS_40:
/* FALLTHROUGH */
default:
/* Use the latest known revision as default */
strcpy(cpu_rev, "3.1");
}
/* Print verbose information */
pr_info("%s ES%s (", cpu_name, cpu_rev);
OMAP3_SHOW_FEATURE(l2cache);
OMAP3_SHOW_FEATURE(iva);
OMAP3_SHOW_FEATURE(sgx);
OMAP3_SHOW_FEATURE(neon);
OMAP3_SHOW_FEATURE(isp);
printk(")\n");
}
/*
* Try to detect the exact revision of the omap we're running on
*/
void __init omap2_check_revision(void)
{
/*
* At this point we have an idea about the processor revision set
* earlier with omap2_set_globals_tap().
*/
if (cpu_is_omap24xx()) {
omap24xx_check_revision();
} else if (cpu_is_omap34xx()) {
omap3_check_revision();
omap3_check_features();
omap3_cpuinfo();
return;
} else if (cpu_is_omap44xx()) {
omap4_check_revision();
return;
} else {
pr_err("OMAP revision unknown, please fix!\n");
}
/*
* OK, now we know the exact revision. Initialize omap_chip bits
* for powerdowmain and clockdomain code.
*/
if (cpu_is_omap243x()) {
/* Currently only supports 2430ES2.1 and 2430-all */
omap_chip.oc |= CHIP_IS_OMAP2430;
return;
} else if (cpu_is_omap242x()) {
/* Currently only supports 2420ES2.1.1 and 2420-all */
omap_chip.oc |= CHIP_IS_OMAP2420;
return;
}
pr_err("Uninitialized omap_chip, please fix!\n");
}
/*
* Set up things for map_io and processor detection later on. Gets called
* pretty much first thing from board init. For multi-omap, this gets
* cpu_is_omapxxxx() working accurately enough for map_io. Then we'll try to
* detect the exact revision later on in omap2_detect_revision() once map_io
* is done.
*/
void __init omap2_set_globals_tap(struct omap_globals *omap2_globals)
{
omap_revision = omap2_globals->class;
tap_base = omap2_globals->tap;
if (cpu_is_omap34xx())
tap_prod_id = 0x0210;
else
tap_prod_id = 0x0208;
}