1/*
 2 * MX31 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
12#include <linux/module.h>
13#include <linux/io.h>
14
15#include "common.h"
16#include "hardware.h"
17#include "iim.h"
18
19static int mx31_cpu_rev = -1;
20
21static struct {
22	u8 srev;
23	const char *name;
24	unsigned int rev;
25} mx31_cpu_type[] = {
26	{ .srev = 0x00, .name = "i.MX31(L)", .rev = IMX_CHIP_REVISION_1_0 },
27	{ .srev = 0x10, .name = "i.MX31",    .rev = IMX_CHIP_REVISION_1_1 },
28	{ .srev = 0x11, .name = "i.MX31L",   .rev = IMX_CHIP_REVISION_1_1 },
29	{ .srev = 0x12, .name = "i.MX31",    .rev = IMX_CHIP_REVISION_1_1 },
30	{ .srev = 0x13, .name = "i.MX31L",   .rev = IMX_CHIP_REVISION_1_1 },
31	{ .srev = 0x14, .name = "i.MX31",    .rev = IMX_CHIP_REVISION_1_2 },
32	{ .srev = 0x15, .name = "i.MX31L",   .rev = IMX_CHIP_REVISION_1_2 },
33	{ .srev = 0x28, .name = "i.MX31",    .rev = IMX_CHIP_REVISION_2_0 },
34	{ .srev = 0x29, .name = "i.MX31L",   .rev = IMX_CHIP_REVISION_2_0 },
35};
36
37static int mx31_read_cpu_rev(void)
38{
39	u32 i, srev;
40
41	/* read SREV register from IIM module */
42	srev = __raw_readl(MX31_IO_ADDRESS(MX31_IIM_BASE_ADDR + MXC_IIMSREV));
43	srev &= 0xff;
44
45	for (i = 0; i < ARRAY_SIZE(mx31_cpu_type); i++)
46		if (srev == mx31_cpu_type[i].srev) {
47			imx_print_silicon_rev(mx31_cpu_type[i].name,
48						mx31_cpu_type[i].rev);
49			return mx31_cpu_type[i].rev;
50		}
51
52	imx_print_silicon_rev("i.MX31", IMX_CHIP_REVISION_UNKNOWN);
53	return IMX_CHIP_REVISION_UNKNOWN;
54}
55
56int mx31_revision(void)
57{
58	if (mx31_cpu_rev == -1)
59		mx31_cpu_rev = mx31_read_cpu_rev();
60
61	return mx31_cpu_rev;
62}
63EXPORT_SYMBOL(mx31_revision);

 1/*
 2 * MX31 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
12#include <linux/module.h>
13#include <linux/io.h>
14#include <mach/hardware.h>
15#include <mach/iim.h>
16#include <mach/common.h>
 
17
18static int mx31_cpu_rev = -1;
19
20static struct {
21	u8 srev;
22	const char *name;
23	unsigned int rev;
24} mx31_cpu_type[] = {
25	{ .srev = 0x00, .name = "i.MX31(L)", .rev = IMX_CHIP_REVISION_1_0 },
26	{ .srev = 0x10, .name = "i.MX31",    .rev = IMX_CHIP_REVISION_1_1 },
27	{ .srev = 0x11, .name = "i.MX31L",   .rev = IMX_CHIP_REVISION_1_1 },
28	{ .srev = 0x12, .name = "i.MX31",    .rev = IMX_CHIP_REVISION_1_1 },
29	{ .srev = 0x13, .name = "i.MX31L",   .rev = IMX_CHIP_REVISION_1_1 },
30	{ .srev = 0x14, .name = "i.MX31",    .rev = IMX_CHIP_REVISION_1_2 },
31	{ .srev = 0x15, .name = "i.MX31L",   .rev = IMX_CHIP_REVISION_1_2 },
32	{ .srev = 0x28, .name = "i.MX31",    .rev = IMX_CHIP_REVISION_2_0 },
33	{ .srev = 0x29, .name = "i.MX31L",   .rev = IMX_CHIP_REVISION_2_0 },
34};
35
36static int mx31_read_cpu_rev(void)
37{
38	u32 i, srev;
39
40	/* read SREV register from IIM module */
41	srev = __raw_readl(MX31_IO_ADDRESS(MX31_IIM_BASE_ADDR + MXC_IIMSREV));
42	srev &= 0xff;
43
44	for (i = 0; i < ARRAY_SIZE(mx31_cpu_type); i++)
45		if (srev == mx31_cpu_type[i].srev) {
46			imx_print_silicon_rev(mx31_cpu_type[i].name,
47						mx31_cpu_type[i].rev);
48			return mx31_cpu_type[i].rev;
49		}
50
51	imx_print_silicon_rev("i.MX31", IMX_CHIP_REVISION_UNKNOWN);
52	return IMX_CHIP_REVISION_UNKNOWN;
53}
54
55int mx31_revision(void)
56{
57	if (mx31_cpu_rev == -1)
58		mx31_cpu_rev = mx31_read_cpu_rev();
59
60	return mx31_cpu_rev;
61}
62EXPORT_SYMBOL(mx31_revision);