/*
 * 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) 2009-11 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 <linux/random.h>
#include <linux/slab.h>

#ifdef CONFIG_SOC_BUS
#include <linux/sys_soc.h>
#endif

#include <asm/cputype.h>

#include "common.h"

#include "id.h"

#include "soc.h"
#include "control.h"

#define OMAP4_SILICON_TYPE_STANDARD             0x01
#define OMAP4_SILICON_TYPE_PERFORMANCE          0x02

#define OMAP_SOC_MAX_NAME_LENGTH                16

static unsigned int omap_revision;
static char soc_name[OMAP_SOC_MAX_NAME_LENGTH];
static char soc_rev[OMAP_SOC_MAX_NAME_LENGTH];
u32 omap_features;

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

int omap_type(void)
{
        static u32 val = OMAP2_DEVICETYPE_MASK;

        if (val < OMAP2_DEVICETYPE_MASK)
                return val;

        if (soc_is_omap24xx()) {
                val = omap_ctrl_readl(OMAP24XX_CONTROL_STATUS);
        } else if (soc_is_ti81xx()) {
                val = omap_ctrl_readl(TI81XX_CONTROL_STATUS);
        } else if (soc_is_am33xx() || soc_is_am43xx()) {
                val = omap_ctrl_readl(AM33XX_CONTROL_STATUS);
        } else if (soc_is_omap34xx()) {
                val = omap_ctrl_readl(OMAP343X_CONTROL_STATUS);
        } else if (soc_is_omap44xx()) {
                val = omap_ctrl_readl(OMAP4_CTRL_MODULE_CORE_STATUS);
        } else if (soc_is_omap54xx() || soc_is_dra7xx()) {
                val = omap_ctrl_readl(OMAP5XXX_CONTROL_STATUS);
                val &= OMAP5_DEVICETYPE_MASK;
                val >>= 6;
                goto out;
        } 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 OMAP_TAP_DIE_ID_44XX_0  0x0200
#define OMAP_TAP_DIE_ID_44XX_1  0x0208
#define OMAP_TAP_DIE_ID_44XX_2  0x020c
#define OMAP_TAP_DIE_ID_44XX_3  0x0210

#define read_tap_reg(reg)       readl_relaxed(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 omap_get_die_id(struct omap_die_id *odi)
{
        if (soc_is_omap44xx() || soc_is_omap54xx() || soc_is_dra7xx()) {
                odi->id_0 = read_tap_reg(OMAP_TAP_DIE_ID_44XX_0);
                odi->id_1 = read_tap_reg(OMAP_TAP_DIE_ID_44XX_1);
                odi->id_2 = read_tap_reg(OMAP_TAP_DIE_ID_44XX_2);
                odi->id_3 = read_tap_reg(OMAP_TAP_DIE_ID_44XX_3);

                return;
        }
        odi->id_0 = read_tap_reg(OMAP_TAP_DIE_ID_0);
        odi->id_1 = read_tap_reg(OMAP_TAP_DIE_ID_1);
        odi->id_2 = read_tap_reg(OMAP_TAP_DIE_ID_2);
        odi->id_3 = read_tap_reg(OMAP_TAP_DIE_ID_3);
}

static int __init omap_feed_randpool(void)
{
        struct omap_die_id odi;

        /* Throw the die ID into the entropy pool at boot */
        omap_get_die_id(&odi);
        add_device_randomness(&odi, sizeof(odi));
        return 0;
}
omap_device_initcall(omap_feed_randpool);

void __init omap2xxx_check_revision(void)
{
        int i, j;
        u32 idcode, prod_id;
        u16 hawkeye;
        u8  dev_type, rev;
        struct omap_die_id odi;

        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;
        omap_get_die_id(&odi);

        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", odi.id_0);
        pr_debug("OMAP_TAP_DIE_ID_1: 0x%08x DEV_REV: %i\n",
                 odi.id_1, (odi.id_1 >> 28) & 0xf);
        pr_debug("OMAP_TAP_DIE_ID_2: 0x%08x\n", odi.id_2);
        pr_debug("OMAP_TAP_DIE_ID_3: 0x%08x\n", odi.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)) {
                pr_err("Unknown OMAP device type. Handling it as OMAP%04x\n",
                       omap_ids[i].type >> 16);
                j = i;
        }

        sprintf(soc_name, "OMAP%04x", omap_rev() >> 16);
        sprintf(soc_rev, "ES%x", (omap_rev() >> 12) & 0xf);

        pr_info("%s", soc_name);
        if ((omap_rev() >> 8) & 0x0f)
                pr_info("%s", soc_rev);
        pr_info("\n");
}

#define OMAP3_SHOW_FEATURE(feat)                \
        if (omap3_has_ ##feat())                \
                n += scnprintf(buf + n, sizeof(buf) - n, #feat " ");

static void __init omap3_cpuinfo(void)
{
        const char *cpu_name;
        char buf[64];
        int n = 0;

        memset(buf, 0, sizeof(buf));

        /*
         * 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 (soc_is_omap3630()) {
                if (omap3_has_iva() && omap3_has_sgx()) {
                        cpu_name = (omap3_has_isp()) ? "OMAP3630/DM3730" : "OMAP3621";
                } else if (omap3_has_iva()) {
                        cpu_name = "DM3725";
                } else if (omap3_has_sgx()) {
                        cpu_name = "OMAP3615/AM3715";
                } else {
                        cpu_name = (omap3_has_isp()) ? "AM3703" : "OMAP3611";
                }
        } else if (soc_is_am35xx()) {
                cpu_name = (omap3_has_sgx()) ? "AM3517" : "AM3505";
        } else if (soc_is_ti816x()) {
                cpu_name = "TI816X";
        } else if (soc_is_am335x()) {
                cpu_name =  "AM335X";
        } else if (soc_is_am437x()) {
                cpu_name =  "AM437x";
        } else if (soc_is_ti814x()) {
                cpu_name = "TI814X";
        } else if (omap3_has_iva() && omap3_has_sgx()) {
                /* OMAP3430, OMAP3525, OMAP3515, OMAP3503 devices */
                cpu_name = "OMAP3430/3530";
        } else if (omap3_has_iva()) {
                cpu_name = "OMAP3525";
        } else if (omap3_has_sgx()) {
                cpu_name = "OMAP3515";
        } else {
                cpu_name = "OMAP3503";
        }

        scnprintf(soc_name, sizeof(soc_name), "%s", cpu_name);

        /* Print verbose information */
        n += scnprintf(buf, sizeof(buf) - n, "%s %s (", soc_name, soc_rev);

        OMAP3_SHOW_FEATURE(l2cache);
        OMAP3_SHOW_FEATURE(iva);
        OMAP3_SHOW_FEATURE(sgx);
        OMAP3_SHOW_FEATURE(neon);
        OMAP3_SHOW_FEATURE(isp);
        OMAP3_SHOW_FEATURE(192mhz_clk);
        if (*(buf + n - 1) == ' ')
                n--;
        n += scnprintf(buf + n, sizeof(buf) - n, ")\n");
        pr_info("%s", buf);
}

#define OMAP3_CHECK_FEATURE(status,feat)                                \
        if (((status & OMAP3_ ##feat## _MASK)                           \
                >> OMAP3_ ##feat## _SHIFT) != FEAT_ ##feat## _NONE) {   \
                omap_features |= OMAP3_HAS_ ##feat;                     \
        }

void __init omap3xxx_check_features(void)
{
        u32 status;

        omap_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);
        if (soc_is_omap3630())
                omap_features |= OMAP3_HAS_192MHZ_CLK;
        if (soc_is_omap3430() || soc_is_omap3630())
                omap_features |= OMAP3_HAS_IO_WAKEUP;
        if (soc_is_omap3630() || omap_rev() == OMAP3430_REV_ES3_1 ||
            omap_rev() == OMAP3430_REV_ES3_1_2)
                omap_features |= OMAP3_HAS_IO_CHAIN_CTRL;

        omap_features |= OMAP3_HAS_SDRC;

        /*
         * am35x fixups:
         * - The am35x Chip ID register has bits 12, 7:5, and 3:2 marked as
         *   reserved and therefore return 0 when read.  Unfortunately,
         *   OMAP3_CHECK_FEATURE() will interpret some of those zeroes to
         *   mean that a feature is present even though it isn't so clear
         *   the incorrectly set feature bits.
         */
        if (soc_is_am35xx())
                omap_features &= ~(OMAP3_HAS_IVA | OMAP3_HAS_ISP);

        /*
         * TODO: Get additional info (where applicable)
         *       e.g. Size of L2 cache.
         */

        omap3_cpuinfo();
}

void __init omap4xxx_check_features(void)
{
        u32 si_type;

        si_type =
        (read_tap_reg(OMAP4_CTRL_MODULE_CORE_STD_FUSE_PROD_ID_1) >> 16) & 0x03;

        if (si_type == OMAP4_SILICON_TYPE_PERFORMANCE)
                omap_features = OMAP4_HAS_PERF_SILICON;
}

void __init ti81xx_check_features(void)
{
        omap_features = OMAP3_HAS_NEON;
        omap3_cpuinfo();
}

void __init am33xx_check_features(void)
{
        u32 status;

        omap_features = OMAP3_HAS_NEON;

        status = omap_ctrl_readl(AM33XX_DEV_FEATURE);
        if (status & AM33XX_SGX_MASK)
                omap_features |= OMAP3_HAS_SGX;

        omap3_cpuinfo();
}

void __init omap3xxx_check_revision(void)
{
        const char *cpu_rev;
        u32 cpuid, idcode;
        u16 hawkeye;
        u8 rev;

        /*
         * 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_id();
        if ((((cpuid >> 4) & 0xfff) == 0xc08) && ((cpuid & 0xf) == 0x0)) {
                omap_revision = OMAP3430_REV_ES1_0;
                cpu_rev = "1.0";
                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;
                        cpu_rev = "2.0";
                        break;
                case 2:
                        omap_revision = OMAP3430_REV_ES2_1;
                        cpu_rev = "2.1";
                        break;
                case 3:
                        omap_revision = OMAP3430_REV_ES3_0;
                        cpu_rev = "3.0";
                        break;
                case 4:
                        omap_revision = OMAP3430_REV_ES3_1;
                        cpu_rev = "3.1";
                        break;
                case 7:
                /* FALLTHROUGH */
                default:
                        /* Use the latest known revision as default */
                        omap_revision = OMAP3430_REV_ES3_1_2;
                        cpu_rev = "3.1.2";
                }
                break;
        case 0xb868:
                /*
                 * Handle OMAP/AM 3505/3517 devices
                 *
                 * Set the device to be OMAP3517 here. Actual device
                 * is identified later based on the features.
                 */
                switch (rev) {
                case 0:
                        omap_revision = AM35XX_REV_ES1_0;
                        cpu_rev = "1.0";
                        break;
                case 1:
                /* FALLTHROUGH */
                default:
                        omap_revision = AM35XX_REV_ES1_1;
                        cpu_rev = "1.1";
                }
                break;
        case 0xb891:
                /* Handle 36xx devices */

                switch(rev) {
                case 0: /* Take care of early samples */
                        omap_revision = OMAP3630_REV_ES1_0;
                        cpu_rev = "1.0";
                        break;
                case 1:
                        omap_revision = OMAP3630_REV_ES1_1;
                        cpu_rev = "1.1";
                        break;
                case 2:
                /* FALLTHROUGH */
                default:
                        omap_revision = OMAP3630_REV_ES1_2;
                        cpu_rev = "1.2";
                }
                break;
        case 0xb81e:
                switch (rev) {
                case 0:
                        omap_revision = TI8168_REV_ES1_0;
                        cpu_rev = "1.0";
                        break;
                case 1:
                        omap_revision = TI8168_REV_ES1_1;
                        cpu_rev = "1.1";
                        break;
                case 2:
                        omap_revision = TI8168_REV_ES2_0;
                        cpu_rev = "2.0";
                        break;
                case 3:
                        /* FALLTHROUGH */
                default:
                        omap_revision = TI8168_REV_ES2_1;
                        cpu_rev = "2.1";
                }
                break;
        case 0xb944:
                switch (rev) {
                case 0:
                        omap_revision = AM335X_REV_ES1_0;
                        cpu_rev = "1.0";
                        break;
                case 1:
                        omap_revision = AM335X_REV_ES2_0;
                        cpu_rev = "2.0";
                        break;
                case 2:
                /* FALLTHROUGH */
                default:
                        omap_revision = AM335X_REV_ES2_1;
                        cpu_rev = "2.1";
                        break;
                }
                break;
        case 0xb98c:
                switch (rev) {
                case 0:
                        omap_revision = AM437X_REV_ES1_0;
                        cpu_rev = "1.0";
                        break;
                case 1:
                        omap_revision = AM437X_REV_ES1_1;
                        cpu_rev = "1.1";
                        break;
                case 2:
                /* FALLTHROUGH */
                default:
                        omap_revision = AM437X_REV_ES1_2;
                        cpu_rev = "1.2";
                        break;
                }
                break;
        case 0xb8f2:
        case 0xb968:
                switch (rev) {
                case 0:
                /* FALLTHROUGH */
                case 1:
                        omap_revision = TI8148_REV_ES1_0;
                        cpu_rev = "1.0";
                        break;
                case 2:
                        omap_revision = TI8148_REV_ES2_0;
                        cpu_rev = "2.0";
                        break;
                case 3:
                /* FALLTHROUGH */
                default:
                        omap_revision = TI8148_REV_ES2_1;
                        cpu_rev = "2.1";
                        break;
                }
                break;
        default:
                /* Unknown default to latest silicon rev as default */
                omap_revision = OMAP3630_REV_ES1_2;
                cpu_rev = "1.2";
                pr_warn("Warning: unknown chip type: hawkeye %04x, assuming OMAP3630ES1.2\n",
                        hawkeye);
        }
        sprintf(soc_rev, "ES%s", cpu_rev);
}

void __init omap4xxx_check_revision(void)
{
        u32 idcode;
        u16 hawkeye;
        u8 rev;

        /*
         * 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) & 0xf;

        /*
         * Few initial 4430 ES2.0 samples IDCODE is same as ES1.0
         * Use ARM register to detect the correct ES version
         */
        if (!rev && (hawkeye != 0xb94e) && (hawkeye != 0xb975)) {
                idcode = read_cpuid_id();
                rev = (idcode & 0xf) - 1;
        }

        switch (hawkeye) {
        case 0xb852:
                switch (rev) {
                case 0:
                        omap_revision = OMAP4430_REV_ES1_0;
                        break;
                case 1:
                default:
                        omap_revision = OMAP4430_REV_ES2_0;
                }
                break;
        case 0xb95c:
                switch (rev) {
                case 3:
                        omap_revision = OMAP4430_REV_ES2_1;
                        break;
                case 4:
                        omap_revision = OMAP4430_REV_ES2_2;
                        break;
                case 6:
                default:
                        omap_revision = OMAP4430_REV_ES2_3;
                }
                break;
        case 0xb94e:
                switch (rev) {
                case 0:
                        omap_revision = OMAP4460_REV_ES1_0;
                        break;
                case 2:
                default:
                        omap_revision = OMAP4460_REV_ES1_1;
                        break;
                }
                break;
        case 0xb975:
                switch (rev) {
                case 0:
                default:
                        omap_revision = OMAP4470_REV_ES1_0;
                        break;
                }
                break;
        default:
                /* Unknown default to latest silicon rev as default */
                omap_revision = OMAP4430_REV_ES2_3;
        }

        sprintf(soc_name, "OMAP%04x", omap_rev() >> 16);
        sprintf(soc_rev, "ES%d.%d", (omap_rev() >> 12) & 0xf,
                                                (omap_rev() >> 8) & 0xf);
        pr_info("%s %s\n", soc_name, soc_rev);
}

void __init omap5xxx_check_revision(void)
{
        u32 idcode;
        u16 hawkeye;
        u8 rev;

        idcode = read_tap_reg(OMAP_TAP_IDCODE);
        hawkeye = (idcode >> 12) & 0xffff;
        rev = (idcode >> 28) & 0xff;
        switch (hawkeye) {
        case 0xb942:
                switch (rev) {
                case 0:
                        /* No support for ES1.0 Test chip */
                        BUG();
                case 1:
                default:
                        omap_revision = OMAP5430_REV_ES2_0;
                }
                break;

        case 0xb998:
                switch (rev) {
                case 0:
                        /* No support for ES1.0 Test chip */
                        BUG();
                case 1:
                default:
                        omap_revision = OMAP5432_REV_ES2_0;
                }
                break;

        default:
                /* Unknown default to latest silicon rev as default*/
                omap_revision = OMAP5430_REV_ES2_0;
        }

        sprintf(soc_name, "OMAP%04x", omap_rev() >> 16);
        sprintf(soc_rev, "ES%d.0", (omap_rev() >> 12) & 0xf);

        pr_info("%s %s\n", soc_name, soc_rev);
}

void __init dra7xxx_check_revision(void)
{
        u32 idcode;
        u16 hawkeye;
        u8 rev;

        idcode = read_tap_reg(OMAP_TAP_IDCODE);
        hawkeye = (idcode >> 12) & 0xffff;
        rev = (idcode >> 28) & 0xff;
        switch (hawkeye) {
        case 0xbb50:
                switch (rev) {
                case 0:
                default:
                        omap_revision = DRA762_REV_ES1_0;
                        break;
                }
                break;

        case 0xb990:
                switch (rev) {
                case 0:
                        omap_revision = DRA752_REV_ES1_0;
                        break;
                case 1:
                        omap_revision = DRA752_REV_ES1_1;
                        break;
                case 2:
                default:
                        omap_revision = DRA752_REV_ES2_0;
                        break;
                }
                break;

        case 0xb9bc:
                switch (rev) {
                case 0:
                        omap_revision = DRA722_REV_ES1_0;
                        break;
                case 1:
                default:
                        omap_revision = DRA722_REV_ES2_0;
                        break;
                }
                break;

        default:
                /* Unknown default to latest silicon rev as default*/
                pr_warn("%s: unknown idcode=0x%08x (hawkeye=0x%08x,rev=0x%x)\n",
                        __func__, idcode, hawkeye, rev);
                omap_revision = DRA752_REV_ES2_0;
        }

        sprintf(soc_name, "DRA%03x", omap_rev() >> 16);
        sprintf(soc_rev, "ES%d.%d", (omap_rev() >> 12) & 0xf,
                (omap_rev() >> 8) & 0xf);

        pr_info("%s %s\n", soc_name, soc_rev);
}

/*
 * 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(u32 class, void __iomem *tap)
{
        omap_revision = class;
        tap_base = tap;

        /* XXX What is this intended to do? */
        if (soc_is_omap34xx())
                tap_prod_id = 0x0210;
        else
                tap_prod_id = 0x0208;
}

#ifdef CONFIG_SOC_BUS

static const char * const omap_types[] = {
        [OMAP2_DEVICE_TYPE_TEST]        = "TST",
        [OMAP2_DEVICE_TYPE_EMU]         = "EMU",
        [OMAP2_DEVICE_TYPE_SEC]         = "HS",
        [OMAP2_DEVICE_TYPE_GP]          = "GP",
        [OMAP2_DEVICE_TYPE_BAD]         = "BAD",
};

static const char * __init omap_get_family(void)
{
        if (soc_is_omap24xx())
                return kasprintf(GFP_KERNEL, "OMAP2");
        else if (soc_is_omap34xx())
                return kasprintf(GFP_KERNEL, "OMAP3");
        else if (soc_is_omap44xx())
                return kasprintf(GFP_KERNEL, "OMAP4");
        else if (soc_is_omap54xx())
                return kasprintf(GFP_KERNEL, "OMAP5");
        else if (soc_is_am33xx() || soc_is_am335x())
                return kasprintf(GFP_KERNEL, "AM33xx");
        else if (soc_is_am43xx())
                return kasprintf(GFP_KERNEL, "AM43xx");
        else if (soc_is_dra7xx())
                return kasprintf(GFP_KERNEL, "DRA7");
        else
                return kasprintf(GFP_KERNEL, "Unknown");
}

static ssize_t omap_get_type(struct device *dev,
                                        struct device_attribute *attr,
                                        char *buf)
{
        return sprintf(buf, "%s\n", omap_types[omap_type()]);
}

static struct device_attribute omap_soc_attr =
        __ATTR(type,  S_IRUGO, omap_get_type,  NULL);

void __init omap_soc_device_init(void)
{
        struct device *parent;
        struct soc_device *soc_dev;
        struct soc_device_attribute *soc_dev_attr;

        soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
        if (!soc_dev_attr)
                return;

        soc_dev_attr->machine  = soc_name;
        soc_dev_attr->family   = omap_get_family();
        soc_dev_attr->revision = soc_rev;

        soc_dev = soc_device_register(soc_dev_attr);
        if (IS_ERR(soc_dev)) {
                kfree(soc_dev_attr);
                return;
        }

        parent = soc_device_to_device(soc_dev);
        device_create_file(parent, &omap_soc_attr);
}
#endif /* CONFIG_SOC_BUS */