id.c

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/*
 * Copyright (C) ST-Ericsson SA 2010
 *
 * Author: Rabin Vincent <[email protected]> for ST-Ericsson
 * License terms: GNU General Public License (GPL) version 2
 */

#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/io.h>

#include <asm/cputype.h>
#include <asm/tlbflush.h>
#include <asm/cacheflush.h>
#include <asm/mach/map.h>

#include <mach/hardware.h>
#include <mach/setup.h>

struct dbx500_asic_id dbx500_id;

static unsigned int ux500_read_asicid(phys_addr_t addr)
{
    phys_addr_t base = addr & ~0xfff;
    struct map_desc desc = {
        .virtual    = UX500_VIRT_ROM,
        .pfn        = __phys_to_pfn(base),
        .length     = SZ_16K,
        .type       = MT_DEVICE,
    };

    iotable_init(&desc, 1);

    /* As in devicemaps_init() */
    local_flush_tlb_all();
    flush_cache_all();

    return readl(IOMEM(UX500_VIRT_ROM + (addr & 0xfff)));
}

static void ux500_print_soc_info(unsigned int asicid)
{
    unsigned int rev = dbx500_revision();

    pr_info("DB%4x ", dbx500_partnumber());

    if (rev == 0x01)
        pr_cont("Early Drop");
    else if (rev >= 0xA0)
        pr_cont("v%d.%d" , (rev >> 4) - 0xA + 1, rev & 0xf);
    else
        pr_cont("Unknown");

    pr_cont(" [%#010x]\n", asicid);
}

static unsigned int partnumber(unsigned int asicid)
{
    return (asicid >> 8) & 0xffff;
}

/*
 * SOC      MIDR        ASICID ADDRESS      ASICID VALUE
 * DB8500ed 0x410fc090  0x9001FFF4      0x00850001
 * DB8500v1 0x411fc091  0x9001FFF4      0x008500A0
 * DB8500v1.1   0x411fc091  0x9001FFF4      0x008500A1
 * DB8500v2 0x412fc091  0x9001DBF4      0x008500B0
 * DB8520v2.2   0x412fc091  0x9001DBF4      0x008500B2
 * DB5500v1 0x412fc091  0x9001FFF4      0x005500A0
 * DB9540   0x413fc090  0xFFFFDBF4      0x009540xx
 */

void __init ux500_map_io(void)
{
    unsigned int cpuid = read_cpuid_id();
    unsigned int asicid = 0;
    phys_addr_t addr = 0;

    switch (cpuid) {
    case 0x410fc090: /* DB8500ed */
    case 0x411fc091: /* DB8500v1 */
        addr = 0x9001FFF4;
        break;

    case 0x412fc091: /* DB8520 / DB8500v2 / DB5500v1 */
        asicid = ux500_read_asicid(0x9001DBF4);
        if (partnumber(asicid) == 0x8500 ||
            partnumber(asicid) == 0x8520)
            /* DB8500v2 */
            break;

        /* DB5500v1 */
        addr = 0x9001FFF4;
        break;

    case 0x413fc090: /* DB9540 */
        addr = 0xFFFFDBF4;
        break;
    }

    if (addr)
        asicid = ux500_read_asicid(addr);

    if (!asicid) {
        pr_err("Unable to identify SoC\n");
        ux500_unknown_soc();
    }

    dbx500_id.process = asicid >> 24;
    dbx500_id.partnumber = partnumber(asicid);
    dbx500_id.revision = asicid & 0xff;

    ux500_print_soc_info(asicid);
}