arch/arm/mach-mx6/cpu.c

/*
 * Copyright (C) 2011 Freescale Semiconductor, Inc. All Rights Reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.

 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.

 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/clk.h>
#include <linux/module.h>
#include <linux/iram_alloc.h>
#include <linux/delay.h>

#include <mach/hardware.h>
#include <asm/io.h>
#include <asm/mach/map.h>

#include "crm_regs.h"

void *mx6_wait_in_iram_base;
void (*mx6_wait_in_iram)(void *ccm_base);
extern void mx6_wait(void);


struct cpu_op *(*get_cpu_op)(int *op);
bool enable_wait_mode;

void __iomem *gpc_base;
void __iomem *ccm_base;

int mx6_set_cpu_voltage(u32 cpu_volt)
{
	u32 reg, val;

	val = (cpu_volt - 725000) / 25000;

	reg = __raw_readl(ANADIG_REG_CORE);
	reg &= ~(ANADIG_REG_TARGET_MASK << ANADIG_REG0_CORE_TARGET_OFFSET);
	reg |= ((val + 1) << ANADIG_REG0_CORE_TARGET_OFFSET);

	__raw_writel(reg, ANADIG_REG_CORE);

	return 0;
}

static int __init post_cpu_init(void)
{
	unsigned int reg;
	void __iomem *base;
	unsigned long iram_paddr, cpaddr;


	iram_init(MX6Q_IRAM_BASE_ADDR, MX6Q_IRAM_SIZE);

	base = ioremap(AIPS1_ON_BASE_ADDR, PAGE_SIZE);
	__raw_writel(0x0, base + 0x40);
	__raw_writel(0x0, base + 0x44);
	__raw_writel(0x0, base + 0x48);
	__raw_writel(0x0, base + 0x4C);
	reg = __raw_readl(base + 0x50) & 0x00FFFFFF;
	__raw_writel(reg, base + 0x50);
	iounmap(base);

	base = ioremap(AIPS2_ON_BASE_ADDR, PAGE_SIZE);
	__raw_writel(0x0, base + 0x40);
	__raw_writel(0x0, base + 0x44);
	__raw_writel(0x0, base + 0x48);
	__raw_writel(0x0, base + 0x4C);
	reg = __raw_readl(base + 0x50) & 0x00FFFFFF;
	__raw_writel(reg, base + 0x50);
	iounmap(base);

	if (enable_wait_mode) {
		/* Allow SCU_CLK to be disabled when all cores are in WFI*/
		base = IO_ADDRESS(SCU_BASE_ADDR);
		reg = __raw_readl(base);
		reg |= 0x20;
		__raw_writel(reg, base);
	}

	/* Disable SRC warm reset to work aound system reboot issue */
	base = IO_ADDRESS(SRC_BASE_ADDR);
	reg = __raw_readl(base);
	reg &= ~0x1;
	__raw_writel(reg, base);

	/* Allocate IRAM for WAIT code. */
	/* Move wait routine into iRAM */
	cpaddr = (unsigned long)iram_alloc(SZ_4K, &iram_paddr);
	/* Need to remap the area here since we want the memory region
		 to be executable. */
	mx6_wait_in_iram_base = __arm_ioremap(iram_paddr, SZ_4K,
					  MT_MEMORY_NONCACHED);
	pr_info("cpaddr = %x wait_iram_base=%x\n",
		(unsigned int)cpaddr, (unsigned int)mx6_wait_in_iram_base);

	/*
	 * Need to run the suspend code from IRAM as the DDR needs
	 * to be put into low power mode manually.
	 */
	memcpy((void *)cpaddr, mx6_wait, SZ_4K);
	mx6_wait_in_iram = (void *)mx6_wait_in_iram_base;

	gpc_base = MX6_IO_ADDRESS(GPC_BASE_ADDR);
	ccm_base = MX6_IO_ADDRESS(CCM_BASE_ADDR);

	return 0;
}
postcore_initcall(post_cpu_init);

static int __init enable_wait(char *p)
{
	enable_wait_mode = true;
	return 0;
}
early_param("enable_wait_mode", enable_wait);