mm.c

/*
 *  Copyright (C) 1999,2000 Arm Limited
 *  Copyright (C) 2000 Deep Blue Solutions Ltd
 *  Copyright (C) 2002 Shane Nay (shane@minirl.com)
 *  Copyright 2005-2007 Freescale Semiconductor, Inc. All Rights Reserved.
 *    - add MX31 specific definitions
 *
 * 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.
 */

#include <linux/mm.h>
#include <linux/init.h>
#include <linux/err.h>

#include <asm/pgtable.h>
#include <asm/mach/map.h>
#include <asm/hardware/cache-l2x0.h>

#include <mach/common.h>
#include <mach/hardware.h>
#include <mach/iomux-v3.h>

/*!
 * @file mm.c
 *
 * @brief This file creates static virtual to physical mappings, common to all MX3 boards.
 *
 * @ingroup Memory
 */

/*!
 * This table defines static virtual address mappings for I/O regions.
 * These are the mappings common across all MX3 boards.
 */
static struct map_desc mxc_io_desc[] __initdata = {
	{
		.virtual	= X_MEMC_BASE_ADDR_VIRT,
		.pfn		= __phys_to_pfn(X_MEMC_BASE_ADDR),
		.length		= X_MEMC_SIZE,
		.type		= MT_DEVICE
	}, {
		.virtual	= AVIC_BASE_ADDR_VIRT,
		.pfn		= __phys_to_pfn(AVIC_BASE_ADDR),
		.length		= AVIC_SIZE,
		.type		= MT_DEVICE_NONSHARED
	}, {
		.virtual	= AIPS1_BASE_ADDR_VIRT,
		.pfn		= __phys_to_pfn(AIPS1_BASE_ADDR),
		.length		= AIPS1_SIZE,
		.type		= MT_DEVICE_NONSHARED
	}, {
		.virtual	= AIPS2_BASE_ADDR_VIRT,
		.pfn		= __phys_to_pfn(AIPS2_BASE_ADDR),
		.length		= AIPS2_SIZE,
		.type		= MT_DEVICE_NONSHARED
	}, {
		.virtual = SPBA0_BASE_ADDR_VIRT,
		.pfn = __phys_to_pfn(SPBA0_BASE_ADDR),
		.length = SPBA0_SIZE,
		.type = MT_DEVICE_NONSHARED
	},
};

/*!
 * This function initializes the memory map. It is called during the
 * system startup to create static physical to virtual memory mappings
 * for the IO modules.
 */
void __init mx31_map_io(void)
{
	mxc_set_cpu_type(MXC_CPU_MX31);
	mxc_arch_reset_init(IO_ADDRESS(WDOG_BASE_ADDR));

	iotable_init(mxc_io_desc, ARRAY_SIZE(mxc_io_desc));
}

#ifdef CONFIG_ARCH_MX35
void __init mx35_map_io(void)
{
	mxc_set_cpu_type(MXC_CPU_MX35);
	mxc_iomux_v3_init(IO_ADDRESS(IOMUXC_BASE_ADDR));
	mxc_arch_reset_init(IO_ADDRESS(WDOG_BASE_ADDR));

	iotable_init(mxc_io_desc, ARRAY_SIZE(mxc_io_desc));
}
#endif

int imx3x_register_gpios(void);

void __init mx31_init_irq(void)
{
	mxc_init_irq(IO_ADDRESS(AVIC_BASE_ADDR));
	imx3x_register_gpios();
}

void __init mx35_init_irq(void)
{
	mx31_init_irq();
}

#ifdef CONFIG_CACHE_L2X0
static int mxc_init_l2x0(void)
{
	void __iomem *l2x0_base;
	void __iomem *clkctl_base;
/*
 * First of all, we must repair broken chip settings. There are some
 * i.MX35 CPUs in the wild, comming with bogus L2 cache settings. These
 * misconfigured CPUs will run amok immediately when the L2 cache gets enabled.
 * Workaraound is to setup the correct register setting prior enabling the
 * L2 cache. This should not hurt already working CPUs, as they are using the
 * same value
 */
#define L2_MEM_VAL 0x10

	clkctl_base = ioremap(MX35_CLKCTL_BASE_ADDR, 4096);
	if (clkctl_base != NULL) {
		writel(0x00000515, clkctl_base + L2_MEM_VAL);
		iounmap(clkctl_base);
	} else {
		pr_err("L2 cache: Cannot fix timing. Trying to continue without\n");
	}

	l2x0_base = ioremap(L2CC_BASE_ADDR, 4096);
	if (IS_ERR(l2x0_base)) {
		printk(KERN_ERR "remapping L2 cache area failed with %ld\n",
				PTR_ERR(l2x0_base));
		return 0;
	}

	l2x0_init(l2x0_base, 0x00030024, 0x00000000);

	return 0;
}

arch_initcall(mxc_init_l2x0);
#endif