Subversion Repositories or1k_soc_on_altera_embedded_dev_kit

/*

 * linux/arch/arm/mach-omap1/id.c

 *

 * OMAP1 CPU identification code

 *

 * Copyright (C) 2004 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/module.h>

#include <linux/kernel.h>

#include <linux/init.h>

#include <asm/io.h>

#define OMAP_DIE_ID_0           0xfffe1800

#define OMAP_DIE_ID_1           0xfffe1804

#define OMAP_PRODUCTION_ID_0    0xfffe2000

#define OMAP_PRODUCTION_ID_1    0xfffe2004

#define OMAP32_ID_0             0xfffed400

#define OMAP32_ID_1             0xfffed404

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] */

};

/* 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 = 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},

};

/*

 * 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 */

        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;

        return die_rev;

}

void __init omap_check_revision(void)

{

        int i;

        u16 jtag_id;

        u8 die_rev;

        u32 omap_id;

        u8 cpu_type;

        jtag_id = omap_get_jtag_id();

        die_rev = omap_get_die_rev();

        omap_id = omap_readl(OMAP32_ID_0);

#ifdef DEBUG

        printk("OMAP_DIE_ID_0: 0x%08x\n", omap_readl(OMAP_DIE_ID_0));

        printk("OMAP_DIE_ID_1: 0x%08x DIE_REV: %i\n",

                omap_readl(OMAP_DIE_ID_1),

               (omap_readl(OMAP_DIE_ID_1) >> 17) & 0xf);

        printk("OMAP_PRODUCTION_ID_0: 0x%08x\n", omap_readl(OMAP_PRODUCTION_ID_0));

        printk("OMAP_PRODUCTION_ID_1: 0x%08x JTAG_ID: 0x%04x\n",

                omap_readl(OMAP_PRODUCTION_ID_1),

                omap_readl(OMAP_PRODUCTION_ID_1) & 0xffff);

        printk("OMAP32_ID_0: 0x%08x\n", omap_readl(OMAP32_ID_0));

        printk("OMAP32_ID_1: 0x%08x\n", omap_readl(OMAP32_ID_1));

        printk("JTAG_ID: 0x%04x DIE_REV: %i\n", jtag_id, die_rev);

#endif

        system_serial_high = omap_readl(OMAP_DIE_ID_0);

        system_serial_low = omap_readl(OMAP_DIE_ID_1);

        /* First check only the major version in a safe way */

        for (i = 0; i < ARRAY_SIZE(omap_ids); i++) {

                if (jtag_id == (omap_ids[i].jtag_id)) {

                        system_rev = omap_ids[i].type;

                        break;

                }

        }

        /* Check if we can find the die revision */

        for (i = 0; i < ARRAY_SIZE(omap_ids); i++) {

                if (jtag_id == omap_ids[i].jtag_id && die_rev == omap_ids[i].die_rev) {

                        system_rev = omap_ids[i].type;

                        break;

                }

        }

        /* Finally check also the omap_id */

        for (i = 0; i < ARRAY_SIZE(omap_ids); i++) {

                if (jtag_id == omap_ids[i].jtag_id

                    && die_rev == omap_ids[i].die_rev

                    && omap_id == omap_ids[i].omap_id) {

                        system_rev = omap_ids[i].type;

                        break;

                }

        }

        /* Add the cpu class info (7xx, 15xx, 16xx, 24xx) */

        cpu_type = system_rev >> 24;

        switch (cpu_type) {

        case 0x07:

                system_rev |= 0x07;

                break;

        case 0x03:

        case 0x15:

                system_rev |= 0x15;

                break;

        case 0x16:

        case 0x17:

                system_rev |= 0x16;

                break;

        case 0x24:

                system_rev |= 0x24;

                break;

        default:

                printk("Unknown OMAP cpu type: 0x%02x\n", cpu_type);

        }

        printk("OMAP%04x", system_rev >> 16);

        if ((system_rev >> 8) & 0xff)

                printk("%x", (system_rev >> 8) & 0xff);

        printk(" revision %i handled as %02xxx id: %08x%08x\n",

               die_rev, system_rev & 0xff, system_serial_low,

               system_serial_high);

}