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Diffstat (limited to 'arch/arm/mach-omap2/id.c')
| -rw-r--r-- | arch/arm/mach-omap2/id.c | 124 |
1 files changed, 124 insertions, 0 deletions
diff --git a/arch/arm/mach-omap2/id.c b/arch/arm/mach-omap2/id.c new file mode 100644 index 0000000..7618730 --- /dev/null +++ b/arch/arm/mach-omap2/id.c @@ -0,0 +1,124 @@ +/* + * linux/arch/arm/mach-omap2/id.c + * + * OMAP2 CPU identification code + * + * Copyright (C) 2005 Nokia Corporation + * Written by Tony Lindgren <tony@atomide.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/config.h> +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/init.h> + +#include <asm/io.h> + +#define OMAP24XX_TAP_BASE io_p2v(0x48014000) + +#define OMAP_TAP_IDCODE 0x0204 +#define OMAP_TAP_PROD_ID 0x0208 + +#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 + +/* system_rev fields for OMAP2 processors: + * CPU id bits [31:16], + * CPU device type [15:12], (unprg,normal,POP) + * CPU revision [11:08] + * CPU class bits [07:00] + */ + +struct omap_id { + u16 hawkeye; /* Silicon type (Hawkeye id) */ + u8 dev; /* Device type from production_id reg */ + u32 type; /* combined type id copied to system_rev */ +}; + +/* Register values to detect the OMAP version */ +static struct omap_id omap_ids[] __initdata = { + { .hawkeye = 0xb5d9, .dev = 0x0, .type = 0x24200000 }, + { .hawkeye = 0xb5d9, .dev = 0x1, .type = 0x24201000 }, + { .hawkeye = 0xb5d9, .dev = 0x2, .type = 0x24202000 }, + { .hawkeye = 0xb5d9, .dev = 0x4, .type = 0x24220000 }, + { .hawkeye = 0xb5d9, .dev = 0x8, .type = 0x24230000 }, + { .hawkeye = 0xb68a, .dev = 0x0, .type = 0x24300000 }, +}; + +static u32 __init read_tap_reg(int reg) +{ + return __raw_readl(OMAP24XX_TAP_BASE + reg); +} + +void __init omap2_check_revision(void) +{ + int i, j; + u32 idcode; + u32 prod_id; + u16 hawkeye; + u8 dev_type; + u8 rev; + + idcode = read_tap_reg(OMAP_TAP_IDCODE); + prod_id = read_tap_reg(OMAP_TAP_PROD_ID); + hawkeye = (idcode >> 12) & 0xffff; + rev = (idcode >> 28) & 0x0f; + dev_type = (prod_id >> 16) & 0x0f; + +#ifdef DEBUG + printk(KERN_DEBUG "OMAP_TAP_IDCODE 0x%08x REV %i HAWKEYE 0x%04x MANF %03x\n", + idcode, rev, hawkeye, (idcode >> 1) & 0x7ff); + printk(KERN_DEBUG "OMAP_TAP_DIE_ID_0: 0x%08x\n", + read_tap_reg(OMAP_TAP_DIE_ID_0)); + printk(KERN_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); + printk(KERN_DEBUG "OMAP_TAP_DIE_ID_2: 0x%08x\n", + read_tap_reg(OMAP_TAP_DIE_ID_2)); + printk(KERN_DEBUG "OMAP_TAP_DIE_ID_3: 0x%08x\n", + read_tap_reg(OMAP_TAP_DIE_ID_3)); + printk(KERN_DEBUG "OMAP_TAP_PROD_ID_0: 0x%08x DEV_TYPE: %i\n", + prod_id, dev_type); +#endif + + /* 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; + } + system_rev = omap_ids[j].type; + + system_rev |= rev << 8; + + /* Add the cpu class info (24xx) */ + system_rev |= 0x24; + + pr_info("OMAP%04x", system_rev >> 16); + if ((system_rev >> 8) & 0x0f) + printk("%x", (system_rev >> 8) & 0x0f); + printk("\n"); +} + |