/*
 * 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 <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

static unsigned int omap_revision;
static const char *cpu_rev;
u32 omap_features;

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

int omap_type(void)
{
	u32 val = 0;

	if (cpu_is_omap24xx()) {
		val = omap_ctrl_readl(OMAP24XX_CONTROL_STATUS);
	} else if (soc_is_am33xx()) {
		val = omap_ctrl_readl(AM33XX_CONTROL_STATUS);
	} else if (cpu_is_omap34xx()) {
		val = omap_ctrl_readl(OMAP343X_CONTROL_STATUS);
	} else if (cpu_is_omap44xx()) {
		val = omap_ctrl_readl(OMAP4_CTRL_MODULE_CORE_STATUS);
	} else if (soc_is_omap54xx()) {
		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)	__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 omap_get_die_id(struct omap_die_id *odi)
{
	if (cpu_is_omap44xx() || soc_is_omap54xx()) {
		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);
}

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;
	}

	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_SHOW_FEATURE(feat)		\
	if (omap3_has_ ##feat())		\
		printk(#feat" ");

static void __init omap3_cpuinfo(void)
{
	const char *cpu_name;

	/*
	 * 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()) {
		cpu_name = "OMAP3630";
	} else if (soc_is_am35xx()) {
		cpu_name = (omap3_has_sgx()) ? "AM3517" : "AM3505";
	} else if (cpu_is_ti816x()) {
		cpu_name = "TI816X";
	} else if (soc_is_am335x()) {
		cpu_name =  "AM335X";
	} else if (cpu_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";
	}

	/* 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);
	OMAP3_SHOW_FEATURE(192mhz_clk);

	printk(")\n");
}

#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 (cpu_is_omap3630())
		omap_features |= OMAP3_HAS_192MHZ_CLK;
	if (cpu_is_omap3430() || cpu_is_omap3630())
		omap_features |= OMAP3_HAS_IO_WAKEUP;
	if (cpu_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)
{