xref: /openbmc/linux/arch/arm/mach-omap1/id.c (revision b6dcefde)
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 #include <linux/io.h>
18 #include <plat/cpu.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 static unsigned int omap_revision;
35 
36 /* Register values to detect the OMAP version */
37 static struct omap_id omap_ids[] __initdata = {
38 	{ .jtag_id = 0xb574, .die_rev = 0x2, .omap_id = 0x03310315, .type = 0x03100000},
39 	{ .jtag_id = 0x355f, .die_rev = 0x0, .omap_id = 0x03320000, .type = 0x07300100},
40 	{ .jtag_id = 0xb55f, .die_rev = 0x0, .omap_id = 0x03320000, .type = 0x07300300},
41 	{ .jtag_id = 0xb62c, .die_rev = 0x1, .omap_id = 0x03320500, .type = 0x08500000},
42 	{ .jtag_id = 0xb470, .die_rev = 0x0, .omap_id = 0x03310100, .type = 0x15100000},
43 	{ .jtag_id = 0xb576, .die_rev = 0x0, .omap_id = 0x03320000, .type = 0x16100000},
44 	{ .jtag_id = 0xb576, .die_rev = 0x2, .omap_id = 0x03320100, .type = 0x16110000},
45 	{ .jtag_id = 0xb576, .die_rev = 0x3, .omap_id = 0x03320100, .type = 0x16100c00},
46 	{ .jtag_id = 0xb576, .die_rev = 0x0, .omap_id = 0x03320200, .type = 0x16100d00},
47 	{ .jtag_id = 0xb613, .die_rev = 0x0, .omap_id = 0x03320300, .type = 0x1610ef00},
48 	{ .jtag_id = 0xb613, .die_rev = 0x0, .omap_id = 0x03320300, .type = 0x1610ef00},
49 	{ .jtag_id = 0xb576, .die_rev = 0x1, .omap_id = 0x03320100, .type = 0x16110000},
50 	{ .jtag_id = 0xb58c, .die_rev = 0x2, .omap_id = 0x03320200, .type = 0x16110b00},
51 	{ .jtag_id = 0xb58c, .die_rev = 0x3, .omap_id = 0x03320200, .type = 0x16110c00},
52 	{ .jtag_id = 0xb65f, .die_rev = 0x0, .omap_id = 0x03320400, .type = 0x16212300},
53 	{ .jtag_id = 0xb65f, .die_rev = 0x1, .omap_id = 0x03320400, .type = 0x16212300},
54 	{ .jtag_id = 0xb65f, .die_rev = 0x1, .omap_id = 0x03320500, .type = 0x16212300},
55 	{ .jtag_id = 0xb5f7, .die_rev = 0x0, .omap_id = 0x03330000, .type = 0x17100000},
56 	{ .jtag_id = 0xb5f7, .die_rev = 0x1, .omap_id = 0x03330100, .type = 0x17100000},
57 	{ .jtag_id = 0xb5f7, .die_rev = 0x2, .omap_id = 0x03330100, .type = 0x17100000},
58 };
59 
60 unsigned int omap_rev(void)
61 {
62 	return omap_revision;
63 }
64 EXPORT_SYMBOL(omap_rev);
65 
66 /*
67  * Get OMAP type from PROD_ID.
68  * 1710 has the PROD_ID in bits 15:00, not in 16:01 as documented in TRM.
69  * 1510 PROD_ID is empty, and 1610 PROD_ID does not make sense.
70  * Undocumented register in TEST BLOCK is used as fallback; This seems to
71  * work on 1510, 1610 & 1710. The official way hopefully will work in future
72  * processors.
73  */
74 static u16 __init omap_get_jtag_id(void)
75 {
76 	u32 prod_id, omap_id;
77 
78 	prod_id = omap_readl(OMAP_PRODUCTION_ID_1);
79 	omap_id = omap_readl(OMAP32_ID_1);
80 
81 	/* Check for unusable OMAP_PRODUCTION_ID_1 on 1611B/5912 and 730/850 */
82 	if (((prod_id >> 20) == 0) || (prod_id == omap_id))
83 		prod_id = 0;
84 	else
85 		prod_id &= 0xffff;
86 
87 	if (prod_id)
88 		return prod_id;
89 
90 	/* Use OMAP32_ID_1 as fallback */
91 	prod_id = ((omap_id >> 12) & 0xffff);
92 
93 	return prod_id;
94 }
95 
96 /*
97  * Get OMAP revision from DIE_REV.
98  * Early 1710 processors may have broken OMAP_DIE_ID, it contains PROD_ID.
99  * Undocumented register in the TEST BLOCK is used as fallback.
100  * REVISIT: This does not seem to work on 1510
101  */
102 static u8 __init omap_get_die_rev(void)
103 {
104 	u32 die_rev;
105 
106 	die_rev = omap_readl(OMAP_DIE_ID_1);
107 
108 	/* Check for broken OMAP_DIE_ID on early 1710 */
109 	if (((die_rev >> 12) & 0xffff) == omap_get_jtag_id())
110 		die_rev = 0;
111 
112 	die_rev = (die_rev >> 17) & 0xf;
113 	if (die_rev)
114 		return die_rev;
115 
116 	die_rev = (omap_readl(OMAP32_ID_1) >> 28) & 0xf;
117 
118 	return die_rev;
119 }
120 
121 void __init omap_check_revision(void)
122 {
123 	int i;
124 	u16 jtag_id;
125 	u8 die_rev;
126 	u32 omap_id;
127 	u8 cpu_type;
128 
129 	jtag_id = omap_get_jtag_id();
130 	die_rev = omap_get_die_rev();
131 	omap_id = omap_readl(OMAP32_ID_0);
132 
133 #ifdef DEBUG
134 	printk(KERN_DEBUG "OMAP_DIE_ID_0: 0x%08x\n", omap_readl(OMAP_DIE_ID_0));
135 	printk(KERN_DEBUG "OMAP_DIE_ID_1: 0x%08x DIE_REV: %i\n",
136 		omap_readl(OMAP_DIE_ID_1),
137 	       (omap_readl(OMAP_DIE_ID_1) >> 17) & 0xf);
138 	printk(KERN_DEBUG "OMAP_PRODUCTION_ID_0: 0x%08x\n",
139 		omap_readl(OMAP_PRODUCTION_ID_0));
140 	printk(KERN_DEBUG "OMAP_PRODUCTION_ID_1: 0x%08x JTAG_ID: 0x%04x\n",
141 		omap_readl(OMAP_PRODUCTION_ID_1),
142 		omap_readl(OMAP_PRODUCTION_ID_1) & 0xffff);
143 	printk(KERN_DEBUG "OMAP32_ID_0: 0x%08x\n", omap_readl(OMAP32_ID_0));
144 	printk(KERN_DEBUG "OMAP32_ID_1: 0x%08x\n", omap_readl(OMAP32_ID_1));
145 	printk(KERN_DEBUG "JTAG_ID: 0x%04x DIE_REV: %i\n", jtag_id, die_rev);
146 #endif
147 
148 	system_serial_high = omap_readl(OMAP_DIE_ID_0);
149 	system_serial_low = omap_readl(OMAP_DIE_ID_1);
150 
151 	/* First check only the major version in a safe way */
152 	for (i = 0; i < ARRAY_SIZE(omap_ids); i++) {
153 		if (jtag_id == (omap_ids[i].jtag_id)) {
154 			omap_revision = omap_ids[i].type;
155 			break;
156 		}
157 	}
158 
159 	/* Check if we can find the die revision */
160 	for (i = 0; i < ARRAY_SIZE(omap_ids); i++) {
161 		if (jtag_id == omap_ids[i].jtag_id && die_rev == omap_ids[i].die_rev) {
162 			omap_revision = omap_ids[i].type;
163 			break;
164 		}
165 	}
166 
167 	/* Finally check also the omap_id */
168 	for (i = 0; i < ARRAY_SIZE(omap_ids); i++) {
169 		if (jtag_id == omap_ids[i].jtag_id
170 		    && die_rev == omap_ids[i].die_rev
171 		    && omap_id == omap_ids[i].omap_id) {
172 			omap_revision = omap_ids[i].type;
173 			break;
174 		}
175 	}
176 
177 	/* Add the cpu class info (7xx, 15xx, 16xx, 24xx) */
178 	cpu_type = omap_revision >> 24;
179 
180 	switch (cpu_type) {
181 	case 0x07:
182 	case 0x08:
183 		omap_revision |= 0x07;
184 		break;
185 	case 0x03:
186 	case 0x15:
187 		omap_revision |= 0x15;
188 		break;
189 	case 0x16:
190 	case 0x17:
191 		omap_revision |= 0x16;
192 		break;
193 	default:
194 		printk(KERN_INFO "Unknown OMAP cpu type: 0x%02x\n", cpu_type);
195 	}
196 
197 	printk(KERN_INFO "OMAP%04x", omap_revision >> 16);
198 	if ((omap_revision >> 8) & 0xff)
199 		printk(KERN_INFO "%x", (omap_revision >> 8) & 0xff);
200 	printk(KERN_INFO " revision %i handled as %02xxx id: %08x%08x\n",
201 	       die_rev, omap_revision & 0xff, system_serial_low,
202 	       system_serial_high);
203 }
204 
205