[deliverable/linux.git] / arch / arm / mach-imx / cpu-imx35.c

/*
 * MX35 CPU type detection
 *
 * Copyright (c) 2009 Daniel Mack <daniel@caiaq.de>
 *
 * 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.
 */
#include <linux/module.h>
#include <linux/io.h>

#include "hardware.h"
#include "iim.h"

static int mx35_cpu_rev = -1;

static int mx35_read_cpu_rev(void)
{
	u32 rev;

	rev = imx_readl(MX35_IO_ADDRESS(MX35_IIM_BASE_ADDR + MXC_IIMSREV));
	switch (rev) {
	case 0x00:
		return IMX_CHIP_REVISION_1_0;
	case 0x10:
		return IMX_CHIP_REVISION_2_0;
	case 0x11:
		return IMX_CHIP_REVISION_2_1;
	default:
		return IMX_CHIP_REVISION_UNKNOWN;
	}
}

int mx35_revision(void)
{
	if (mx35_cpu_rev == -1)
		mx35_cpu_rev = mx35_read_cpu_rev();

	return mx35_cpu_rev;
}
EXPORT_SYMBOL(mx35_revision);
Commit	Line	Data
	1	/*
	2	* MX35 CPU type detection
	3	*
	4	* Copyright (c) 2009 Daniel Mack <daniel@caiaq.de>
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License as published by
	8	* the Free Software Foundation; either version 2 of the License, or
	9	* (at your option) any later version.
	10	*/
	11	#include <linux/module.h>
	12	#include <linux/io.h>
	13
	14	#include "hardware.h"
	15	#include "iim.h"
	16
	17	static int mx35_cpu_rev = -1;
	18
	19	static int mx35_read_cpu_rev(void)
	20	{
	21	u32 rev;
	22
	23	rev = imx_readl(MX35_IO_ADDRESS(MX35_IIM_BASE_ADDR + MXC_IIMSREV));
	24	switch (rev) {
	25	case 0x00:
	26	return IMX_CHIP_REVISION_1_0;
	27	case 0x10:
	28	return IMX_CHIP_REVISION_2_0;
	29	case 0x11:
	30	return IMX_CHIP_REVISION_2_1;
	31	default:
	32	return IMX_CHIP_REVISION_UNKNOWN;
	33	}
	34	}
	35
	36	int mx35_revision(void)
	37	{
	38	if (mx35_cpu_rev == -1)
	39	mx35_cpu_rev = mx35_read_cpu_rev();
	40
	41	return mx35_cpu_rev;
	42	}
	43	EXPORT_SYMBOL(mx35_revision);