/*
 * Copyright 2004-2007, 2010 Freescale Semiconductor,
 * Inc. All Rights Reserved.
 */

/*
 * The code contained herein is licensed under the GNU General Public
 * License. You may obtain a copy of the GNU General Public License
 * Version 2 or later at the following locations:
 *
 * http://www.opensource.org/licenses/gpl-license.html
 * http://www.gnu.org/copyleft/gpl.html
 */

#include <linux/init.h>
#include <linux/module.h>
#include <asm/setup.h>
#include <mach/common.h>
#include <mach/hardware.h>

extern int mxc_early_serial_console_init(unsigned long base, struct clk *clk);

/*!
 * @file plat-mxc/cpu_common.c
 *
 * @brief This file contains the common CPU initialization code.
 *
 * @ingroup MSL_MX31 MSL_MXC91321
 */

static void __init system_rev_setup(char **p)
{
	system_rev = simple_strtoul(*p, NULL, 16);
}

__early_param("system_rev=", system_rev_setup);

int mxc_jtag_enabled;		/* OFF: 0 (default), ON: 1 */
int uart_at_24; 			/* OFF: 0 (default); ON: 1 */
/*
 * Here are the JTAG options from the command line. By default JTAG
 * is OFF which means JTAG is not connected and WFI is enabled
 *
 *       "on" --  JTAG is connected, so WFI is disabled
 *       "off" -- JTAG is disconnected, so WFI is enabled
 */

static void __init jtag_wfi_setup(char **p)
{
	if (memcmp(*p, "on", 2) == 0) {
		mxc_jtag_enabled = 1;
		*p += 2;
	} else if (memcmp(*p, "off", 3) == 0) {
		mxc_jtag_enabled = 0;
		*p += 3;
	}
}

static void __init uart_parent_setup(char **p)
{
	if (memcmp(*p, "on", 2) == 0) {
		/* set the UART parent clock to be lp-apm */
		uart_at_24 = 1;
		*p += 2;
	} else if (memcmp(*p, "off", 3) == 0) {
		uart_at_24 = 0;
		*p += 3;
	}
}

__early_param("jtag=", jtag_wfi_setup);
__early_param("debug_uart=", uart_parent_setup);

void __init mxc_cpu_common_init(void)
{
	mxc_set_cpu_type((((system_rev >> 20) & 0xF) * 10) + ((system_rev >> 16) & 0xF));
	pr_info("CPU is %s%x Revision %u.%u\n",
		(mxc_cpu() < 0x100) ? "i.MX" : "MXC",
		mxc_cpu(), mxc_cpu_rev_major(), mxc_cpu_rev_minor());
}

/**
 * early_console_setup - setup debugging console
 *
 * Consoles started here require little enough setup that we can start using
 * them very early in the boot process, either right after the machine
 * vector initialization, or even before if the drivers can detect their hw.
 *
 * Returns non-zero if a console couldn't be setup.
 * This function is developed based on
 * early_console_setup function as defined in arch/ia64/kernel/setup.c
 */
void __init early_console_setup(unsigned long base, struct clk *clk)
{
#ifdef CONFIG_SERIAL_MXC_CONSOLE
	mxc_early_serial_console_init(base, clk);
#endif
}