1/*
2 * linux/arch/arm/mach-omap2/id.c
3 *
4 * OMAP2 CPU identification code
5 *
6 * Copyright (C) 2005 Nokia Corporation
7 * Written by Tony Lindgren <tony@atomide.com>
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
12 */
13
14#include <linux/module.h>
15#include <linux/kernel.h>
16#include <linux/init.h>
17
18#include <asm/io.h>
19
20#define OMAP24XX_TAP_BASE	io_p2v(0x48014000)
21
22#define OMAP_TAP_IDCODE		0x0204
23#define OMAP_TAP_PROD_ID	0x0208
24
25#define OMAP_TAP_DIE_ID_0	0x0218
26#define OMAP_TAP_DIE_ID_1	0x021C
27#define OMAP_TAP_DIE_ID_2	0x0220
28#define OMAP_TAP_DIE_ID_3	0x0224
29
30/* system_rev fields for OMAP2 processors:
31 *   CPU id bits     [31:16],
32 *   CPU device type [15:12], (unprg,normal,POP)
33 *   CPU revision    [11:08]
34 *   CPU class bits  [07:00]
35 */
36
37struct omap_id {
38	u16	hawkeye;	/* Silicon type (Hawkeye id) */
39	u8	dev;		/* Device type from production_id reg */
40	u32	type;		/* combined type id copied to system_rev */
41};
42
43/* Register values to detect the OMAP version */
44static struct omap_id omap_ids[] __initdata = {
45	{ .hawkeye = 0xb5d9, .dev = 0x0, .type = 0x24200000 },
46	{ .hawkeye = 0xb5d9, .dev = 0x1, .type = 0x24201000 },
47	{ .hawkeye = 0xb5d9, .dev = 0x2, .type = 0x24202000 },
48	{ .hawkeye = 0xb5d9, .dev = 0x4, .type = 0x24220000 },
49	{ .hawkeye = 0xb5d9, .dev = 0x8, .type = 0x24230000 },
50	{ .hawkeye = 0xb68a, .dev = 0x0, .type = 0x24300000 },
51};
52
53static u32 __init read_tap_reg(int reg)
54{
55	return __raw_readl(OMAP24XX_TAP_BASE + reg);
56}
57
58void __init omap2_check_revision(void)
59{
60	int i, j;
61	u32 idcode;
62	u32 prod_id;
63	u16 hawkeye;
64	u8  dev_type;
65	u8  rev;
66
67	idcode = read_tap_reg(OMAP_TAP_IDCODE);
68	prod_id = read_tap_reg(OMAP_TAP_PROD_ID);
69	hawkeye = (idcode >> 12) & 0xffff;
70	rev = (idcode >> 28) & 0x0f;
71	dev_type = (prod_id >> 16) & 0x0f;
72
73#ifdef DEBUG
74	printk(KERN_DEBUG "OMAP_TAP_IDCODE 0x%08x REV %i HAWKEYE 0x%04x MANF %03x\n",
75		idcode, rev, hawkeye, (idcode >> 1) & 0x7ff);
76	printk(KERN_DEBUG "OMAP_TAP_DIE_ID_0: 0x%08x\n",
77		read_tap_reg(OMAP_TAP_DIE_ID_0));
78	printk(KERN_DEBUG "OMAP_TAP_DIE_ID_1: 0x%08x DEV_REV: %i\n",
79		read_tap_reg(OMAP_TAP_DIE_ID_1),
80	       (read_tap_reg(OMAP_TAP_DIE_ID_1) >> 28) & 0xf);
81	printk(KERN_DEBUG "OMAP_TAP_DIE_ID_2: 0x%08x\n",
82		read_tap_reg(OMAP_TAP_DIE_ID_2));
83	printk(KERN_DEBUG "OMAP_TAP_DIE_ID_3: 0x%08x\n",
84		read_tap_reg(OMAP_TAP_DIE_ID_3));
85	printk(KERN_DEBUG "OMAP_TAP_PROD_ID_0: 0x%08x DEV_TYPE: %i\n",
86		prod_id, dev_type);
87#endif
88
89	/* Check hawkeye ids */
90	for (i = 0; i < ARRAY_SIZE(omap_ids); i++) {
91		if (hawkeye == omap_ids[i].hawkeye)
92			break;
93	}
94
95	if (i == ARRAY_SIZE(omap_ids)) {
96		printk(KERN_ERR "Unknown OMAP CPU id\n");
97		return;
98	}
99
100	for (j = i; j < ARRAY_SIZE(omap_ids); j++) {
101		if (dev_type == omap_ids[j].dev)
102			break;
103	}
104
105	if (j == ARRAY_SIZE(omap_ids)) {
106		printk(KERN_ERR "Unknown OMAP device type. "
107				"Handling it as OMAP%04x\n",
108				omap_ids[i].type >> 16);
109		j = i;
110	}
111	system_rev = omap_ids[j].type;
112
113	system_rev |= rev << 8;
114
115	/* Add the cpu class info (24xx) */
116	system_rev |= 0x24;
117
118	pr_info("OMAP%04x", system_rev >> 16);
119	if ((system_rev >> 8) & 0x0f)
120		printk("%x", (system_rev >> 8) & 0x0f);
121	printk("\n");
122}
123