xref: /openbmc/linux/arch/arm/mach-omap1/id.c (revision 7e0a9e62)
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * linux/arch/arm/mach-omap1/id.c
4  *
5  * OMAP1 CPU identification code
6  *
7  * Copyright (C) 2004 Nokia Corporation
8  * Written by Tony Lindgren <tony@atomide.com>
9  */
10 
11 #include <linux/module.h>
12 #include <linux/kernel.h>
13 #include <linux/init.h>
14 #include <linux/io.h>
15 #include <linux/soc/ti/omap1-io.h>
16 #include <asm/system_info.h>
17 
18 #include "soc.h"
19 #include "hardware.h"
20 #include "common.h"
21 
22 #define OMAP_DIE_ID_0		0xfffe1800
23 #define OMAP_DIE_ID_1		0xfffe1804
24 #define OMAP_PRODUCTION_ID_0	0xfffe2000
25 #define OMAP_PRODUCTION_ID_1	0xfffe2004
26 #define OMAP32_ID_0		0xfffed400
27 #define OMAP32_ID_1		0xfffed404
28 
29 struct omap_id {
30 	u16	jtag_id;	/* Used to determine OMAP type */
31 	u8	die_rev;	/* Processor revision */
32 	u32	omap_id;	/* OMAP revision */
33 	u32	type;		/* Cpu id bits [31:08], cpu class bits [07:00] */
34 };
35 
36 static unsigned int omap_revision;
37 
38 /* Register values to detect the OMAP version */
39 static struct omap_id omap_ids[] __initdata = {
40 	{ .jtag_id = 0xb574, .die_rev = 0x2, .omap_id = 0x03310315, .type = 0x03100000},
41 	{ .jtag_id = 0x355f, .die_rev = 0x0, .omap_id = 0x03320000, .type = 0x07300100},
42 	{ .jtag_id = 0xb55f, .die_rev = 0x0, .omap_id = 0x03320000, .type = 0x07300300},
43 	{ .jtag_id = 0xb62c, .die_rev = 0x1, .omap_id = 0x03320500, .type = 0x08500000},
44 	{ .jtag_id = 0xb470, .die_rev = 0x0, .omap_id = 0x03310100, .type = 0x15100000},
45 	{ .jtag_id = 0xb576, .die_rev = 0x0, .omap_id = 0x03320000, .type = 0x16100000},
46 	{ .jtag_id = 0xb576, .die_rev = 0x2, .omap_id = 0x03320100, .type = 0x16110000},
47 	{ .jtag_id = 0xb576, .die_rev = 0x3, .omap_id = 0x03320100, .type = 0x16100c00},
48 	{ .jtag_id = 0xb576, .die_rev = 0x0, .omap_id = 0x03320200, .type = 0x16100d00},
49 	{ .jtag_id = 0xb613, .die_rev = 0x0, .omap_id = 0x03320300, .type = 0x1610ef00},
50 	{ .jtag_id = 0xb613, .die_rev = 0x0, .omap_id = 0x03320300, .type = 0x1610ef00},
51 	{ .jtag_id = 0xb576, .die_rev = 0x1, .omap_id = 0x03320100, .type = 0x16110000},
52 	{ .jtag_id = 0xb58c, .die_rev = 0x2, .omap_id = 0x03320200, .type = 0x16110b00},
53 	{ .jtag_id = 0xb58c, .die_rev = 0x3, .omap_id = 0x03320200, .type = 0x16110c00},
54 	{ .jtag_id = 0xb65f, .die_rev = 0x0, .omap_id = 0x03320400, .type = 0x16212300},
55 	{ .jtag_id = 0xb65f, .die_rev = 0x1, .omap_id = 0x03320400, .type = 0x16212300},
56 	{ .jtag_id = 0xb65f, .die_rev = 0x1, .omap_id = 0x03320500, .type = 0x16212300},
57 	{ .jtag_id = 0xb5f7, .die_rev = 0x0, .omap_id = 0x03330000, .type = 0x17100000},
58 	{ .jtag_id = 0xb5f7, .die_rev = 0x1, .omap_id = 0x03330100, .type = 0x17100000},
59 	{ .jtag_id = 0xb5f7, .die_rev = 0x2, .omap_id = 0x03330100, .type = 0x17100000},
60 };
61 
omap_rev(void)62 unsigned int omap_rev(void)
63 {
64 	return omap_revision;
65 }
66 EXPORT_SYMBOL(omap_rev);
67 
68 /*
69  * Get OMAP type from PROD_ID.
70  * 1710 has the PROD_ID in bits 15:00, not in 16:01 as documented in TRM.
71  * 1510 PROD_ID is empty, and 1610 PROD_ID does not make sense.
72  * Undocumented register in TEST BLOCK is used as fallback; This seems to
73  * work on 1510, 1610 & 1710. The official way hopefully will work in future
74  * processors.
75  */
omap_get_jtag_id(void)76 static u16 __init omap_get_jtag_id(void)
77 {
78 	u32 prod_id, omap_id;
79 
80 	prod_id = omap_readl(OMAP_PRODUCTION_ID_1);
81 	omap_id = omap_readl(OMAP32_ID_1);
82 
83 	/* Check for unusable OMAP_PRODUCTION_ID_1 on 1611B/5912 and 730/850 */
84 	if (((prod_id >> 20) == 0) || (prod_id == omap_id))
85 		prod_id = 0;
86 	else
87 		prod_id &= 0xffff;
88 
89 	if (prod_id)
90 		return prod_id;
91 
92 	/* Use OMAP32_ID_1 as fallback */
93 	prod_id = ((omap_id >> 12) & 0xffff);
94 
95 	return prod_id;
96 }
97 
98 /*
99  * Get OMAP revision from DIE_REV.
100  * Early 1710 processors may have broken OMAP_DIE_ID, it contains PROD_ID.
101  * Undocumented register in the TEST BLOCK is used as fallback.
102  * REVISIT: This does not seem to work on 1510
103  */
omap_get_die_rev(void)104 static u8 __init omap_get_die_rev(void)
105 {
106 	u32 die_rev;
107 
108 	die_rev = omap_readl(OMAP_DIE_ID_1);
109 
110 	/* Check for broken OMAP_DIE_ID on early 1710 */
111 	if (((die_rev >> 12) & 0xffff) == omap_get_jtag_id())
112 		die_rev = 0;
113 
114 	die_rev = (die_rev >> 17) & 0xf;
115 	if (die_rev)
116 		return die_rev;
117 
118 	die_rev = (omap_readl(OMAP32_ID_1) >> 28) & 0xf;
119 
120 	return die_rev;
121 }
122 
omap_check_revision(void)123 void __init omap_check_revision(void)
124 {
125 	int i;
126 	u16 jtag_id;
127 	u8 die_rev;
128 	u32 omap_id;
129 	u8 cpu_type;
130 
131 	jtag_id = omap_get_jtag_id();
132 	die_rev = omap_get_die_rev();
133 	omap_id = omap_readl(OMAP32_ID_0);
134 
135 #ifdef DEBUG
136 	printk(KERN_DEBUG "OMAP_DIE_ID_0: 0x%08x\n", omap_readl(OMAP_DIE_ID_0));
137 	printk(KERN_DEBUG "OMAP_DIE_ID_1: 0x%08x DIE_REV: %i\n",
138 		omap_readl(OMAP_DIE_ID_1),
139 	       (omap_readl(OMAP_DIE_ID_1) >> 17) & 0xf);
140 	printk(KERN_DEBUG "OMAP_PRODUCTION_ID_0: 0x%08x\n",
141 		omap_readl(OMAP_PRODUCTION_ID_0));
142 	printk(KERN_DEBUG "OMAP_PRODUCTION_ID_1: 0x%08x JTAG_ID: 0x%04x\n",
143 		omap_readl(OMAP_PRODUCTION_ID_1),
144 		omap_readl(OMAP_PRODUCTION_ID_1) & 0xffff);
145 	printk(KERN_DEBUG "OMAP32_ID_0: 0x%08x\n", omap_readl(OMAP32_ID_0));
146 	printk(KERN_DEBUG "OMAP32_ID_1: 0x%08x\n", omap_readl(OMAP32_ID_1));
147 	printk(KERN_DEBUG "JTAG_ID: 0x%04x DIE_REV: %i\n", jtag_id, die_rev);
148 #endif
149 
150 	system_serial_high = omap_readl(OMAP_DIE_ID_0);
151 	system_serial_low = omap_readl(OMAP_DIE_ID_1);
152 
153 	/* First check only the major version in a safe way */
154 	for (i = 0; i < ARRAY_SIZE(omap_ids); i++) {
155 		if (jtag_id == (omap_ids[i].jtag_id)) {
156 			omap_revision = omap_ids[i].type;
157 			break;
158 		}
159 	}
160 
161 	/* Check if we can find the die revision */
162 	for (i = 0; i < ARRAY_SIZE(omap_ids); i++) {
163 		if (jtag_id == omap_ids[i].jtag_id && die_rev == omap_ids[i].die_rev) {
164 			omap_revision = omap_ids[i].type;
165 			break;
166 		}
167 	}
168 
169 	/* Finally check also the omap_id */
170 	for (i = 0; i < ARRAY_SIZE(omap_ids); i++) {
171 		if (jtag_id == omap_ids[i].jtag_id
172 		    && die_rev == omap_ids[i].die_rev
173 		    && omap_id == omap_ids[i].omap_id) {
174 			omap_revision = omap_ids[i].type;
175 			break;
176 		}
177 	}
178 
179 	/* Add the cpu class info (7xx, 15xx, 16xx, 24xx) */
180 	cpu_type = omap_revision >> 24;
181 
182 	switch (cpu_type) {
183 	case 0x07:
184 	case 0x08:
185 		omap_revision |= 0x07;
186 		break;
187 	case 0x03:
188 	case 0x15:
189 		omap_revision |= 0x15;
190 		break;
191 	case 0x16:
192 	case 0x17:
193 		omap_revision |= 0x16;
194 		break;
195 	default:
196 		printk(KERN_INFO "Unknown OMAP cpu type: 0x%02x\n", cpu_type);
197 	}
198 
199 	pr_info("OMAP%04x", omap_revision >> 16);
200 	if ((omap_revision >> 8) & 0xff)
201 		pr_cont("%x", (omap_revision >> 8) & 0xff);
202 	pr_cont(" revision %i handled as %02xxx id: %08x%08x\n",
203 	       die_rev, omap_revision & 0xff, system_serial_low,
204 	       system_serial_high);
205 }
206 
207