xref: /linux/arch/arm/mach-omap1/id.c (revision 14b42963f64b98ab61fa9723c03d71aa5ef4f862)
1 /*
2  * linux/arch/arm/mach-omap1/id.c
3  *
4  * OMAP1 CPU identification code
5  *
6  * Copyright (C) 2004 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 OMAP_DIE_ID_0		0xfffe1800
21 #define OMAP_DIE_ID_1		0xfffe1804
22 #define OMAP_PRODUCTION_ID_0	0xfffe2000
23 #define OMAP_PRODUCTION_ID_1	0xfffe2004
24 #define OMAP32_ID_0		0xfffed400
25 #define OMAP32_ID_1		0xfffed404
26 
27 struct omap_id {
28 	u16	jtag_id;	/* Used to determine OMAP type */
29 	u8	die_rev;	/* Processor revision */
30 	u32	omap_id;	/* OMAP revision */
31 	u32	type;		/* Cpu id bits [31:08], cpu class bits [07:00] */
32 };
33 
34 /* Register values to detect the OMAP version */
35 static struct omap_id omap_ids[] __initdata = {
36 	{ .jtag_id = 0xb574, .die_rev = 0x2, .omap_id = 0x03310315, .type = 0x03100000},
37 	{ .jtag_id = 0x355f, .die_rev = 0x0, .omap_id = 0x03320000, .type = 0x07300100},
38 	{ .jtag_id = 0xb55f, .die_rev = 0x0, .omap_id = 0x03320000, .type = 0x07300300},
39 	{ .jtag_id = 0xb470, .die_rev = 0x0, .omap_id = 0x03310100, .type = 0x15100000},
40 	{ .jtag_id = 0xb576, .die_rev = 0x0, .omap_id = 0x03320000, .type = 0x16100000},
41 	{ .jtag_id = 0xb576, .die_rev = 0x2, .omap_id = 0x03320100, .type = 0x16110000},
42 	{ .jtag_id = 0xb576, .die_rev = 0x3, .omap_id = 0x03320100, .type = 0x16100c00},
43 	{ .jtag_id = 0xb576, .die_rev = 0x0, .omap_id = 0x03320200, .type = 0x16100d00},
44 	{ .jtag_id = 0xb613, .die_rev = 0x0, .omap_id = 0x03320300, .type = 0x1610ef00},
45 	{ .jtag_id = 0xb613, .die_rev = 0x0, .omap_id = 0x03320300, .type = 0x1610ef00},
46 	{ .jtag_id = 0xb576, .die_rev = 0x1, .omap_id = 0x03320100, .type = 0x16110000},
47 	{ .jtag_id = 0xb58c, .die_rev = 0x2, .omap_id = 0x03320200, .type = 0x16110b00},
48 	{ .jtag_id = 0xb58c, .die_rev = 0x3, .omap_id = 0x03320200, .type = 0x16110c00},
49 	{ .jtag_id = 0xb65f, .die_rev = 0x0, .omap_id = 0x03320400, .type = 0x16212300},
50 	{ .jtag_id = 0xb65f, .die_rev = 0x1, .omap_id = 0x03320400, .type = 0x16212300},
51 	{ .jtag_id = 0xb65f, .die_rev = 0x1, .omap_id = 0x03320500, .type = 0x16212300},
52 	{ .jtag_id = 0xb5f7, .die_rev = 0x0, .omap_id = 0x03330000, .type = 0x17100000},
53 	{ .jtag_id = 0xb5f7, .die_rev = 0x1, .omap_id = 0x03330100, .type = 0x17100000},
54 	{ .jtag_id = 0xb5f7, .die_rev = 0x2, .omap_id = 0x03330100, .type = 0x17100000},
55 };
56 
57 /*
58  * Get OMAP type from PROD_ID.
59  * 1710 has the PROD_ID in bits 15:00, not in 16:01 as documented in TRM.
60  * 1510 PROD_ID is empty, and 1610 PROD_ID does not make sense.
61  * Undocumented register in TEST BLOCK is used as fallback; This seems to
62  * work on 1510, 1610 & 1710. The official way hopefully will work in future
63  * processors.
64  */
65 static u16 __init omap_get_jtag_id(void)
66 {
67 	u32 prod_id, omap_id;
68 
69 	prod_id = omap_readl(OMAP_PRODUCTION_ID_1);
70 	omap_id = omap_readl(OMAP32_ID_1);
71 
72 	/* Check for unusable OMAP_PRODUCTION_ID_1 on 1611B/5912 and 730 */
73 	if (((prod_id >> 20) == 0) || (prod_id == omap_id))
74 		prod_id = 0;
75 	else
76 		prod_id &= 0xffff;
77 
78 	if (prod_id)
79 		return prod_id;
80 
81 	/* Use OMAP32_ID_1 as fallback */
82 	prod_id = ((omap_id >> 12) & 0xffff);
83 
84 	return prod_id;
85 }
86 
87 /*
88  * Get OMAP revision from DIE_REV.
89  * Early 1710 processors may have broken OMAP_DIE_ID, it contains PROD_ID.
90  * Undocumented register in the TEST BLOCK is used as fallback.
91  * REVISIT: This does not seem to work on 1510
92  */
93 static u8 __init omap_get_die_rev(void)
94 {
95 	u32 die_rev;
96 
97 	die_rev = omap_readl(OMAP_DIE_ID_1);
98 
99 	/* Check for broken OMAP_DIE_ID on early 1710 */
100 	if (((die_rev >> 12) & 0xffff) == omap_get_jtag_id())
101 		die_rev = 0;
102 
103 	die_rev = (die_rev >> 17) & 0xf;
104 	if (die_rev)
105 		return die_rev;
106 
107 	die_rev = (omap_readl(OMAP32_ID_1) >> 28) & 0xf;
108 
109 	return die_rev;
110 }
111 
112 void __init omap_check_revision(void)
113 {
114 	int i;
115 	u16 jtag_id;
116 	u8 die_rev;
117 	u32 omap_id;
118 	u8 cpu_type;
119 
120 	jtag_id = omap_get_jtag_id();
121 	die_rev = omap_get_die_rev();
122 	omap_id = omap_readl(OMAP32_ID_0);
123 
124 #ifdef DEBUG
125 	printk("OMAP_DIE_ID_0: 0x%08x\n", omap_readl(OMAP_DIE_ID_0));
126 	printk("OMAP_DIE_ID_1: 0x%08x DIE_REV: %i\n",
127 		omap_readl(OMAP_DIE_ID_1),
128 	       (omap_readl(OMAP_DIE_ID_1) >> 17) & 0xf);
129 	printk("OMAP_PRODUCTION_ID_0: 0x%08x\n", omap_readl(OMAP_PRODUCTION_ID_0));
130 	printk("OMAP_PRODUCTION_ID_1: 0x%08x JTAG_ID: 0x%04x\n",
131 		omap_readl(OMAP_PRODUCTION_ID_1),
132 		omap_readl(OMAP_PRODUCTION_ID_1) & 0xffff);
133 	printk("OMAP32_ID_0: 0x%08x\n", omap_readl(OMAP32_ID_0));
134 	printk("OMAP32_ID_1: 0x%08x\n", omap_readl(OMAP32_ID_1));
135 	printk("JTAG_ID: 0x%04x DIE_REV: %i\n", jtag_id, die_rev);
136 #endif
137 
138 	system_serial_high = omap_readl(OMAP_DIE_ID_0);
139 	system_serial_low = omap_readl(OMAP_DIE_ID_1);
140 
141 	/* First check only the major version in a safe way */
142 	for (i = 0; i < ARRAY_SIZE(omap_ids); i++) {
143 		if (jtag_id == (omap_ids[i].jtag_id)) {
144 			system_rev = omap_ids[i].type;
145 			break;
146 		}
147 	}
148 
149 	/* Check if we can find the die revision */
150 	for (i = 0; i < ARRAY_SIZE(omap_ids); i++) {
151 		if (jtag_id == omap_ids[i].jtag_id && die_rev == omap_ids[i].die_rev) {
152 			system_rev = omap_ids[i].type;
153 			break;
154 		}
155 	}
156 
157 	/* Finally check also the omap_id */
158 	for (i = 0; i < ARRAY_SIZE(omap_ids); i++) {
159 		if (jtag_id == omap_ids[i].jtag_id
160 		    && die_rev == omap_ids[i].die_rev
161 		    && omap_id == omap_ids[i].omap_id) {
162 			system_rev = omap_ids[i].type;
163 			break;
164 		}
165 	}
166 
167 	/* Add the cpu class info (7xx, 15xx, 16xx, 24xx) */
168 	cpu_type = system_rev >> 24;
169 
170 	switch (cpu_type) {
171 	case 0x07:
172 		system_rev |= 0x07;
173 		break;
174 	case 0x03:
175 	case 0x15:
176 		system_rev |= 0x15;
177 		break;
178 	case 0x16:
179 	case 0x17:
180 		system_rev |= 0x16;
181 		break;
182 	case 0x24:
183 		system_rev |= 0x24;
184 		break;
185 	default:
186 		printk("Unknown OMAP cpu type: 0x%02x\n", cpu_type);
187 	}
188 
189 	printk("OMAP%04x", system_rev >> 16);
190 	if ((system_rev >> 8) & 0xff)
191 		printk("%x", (system_rev >> 8) & 0xff);
192 	printk(" revision %i handled as %02xxx id: %08x%08x\n",
193 	       die_rev, system_rev & 0xff, system_serial_low,
194 	       system_serial_high);
195 }
196 
197