FreeBSD/Linux Kernel Cross Reference
sys/arm/ti/ti_cpuid.c
1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2011
5 * Ben Gray <ben.r.gray@gmail.com>.
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30 #include <sys/cdefs.h>
31 __FBSDID("$FreeBSD$");
32
33 #include <sys/param.h>
34 #include <sys/systm.h>
35 #include <sys/kernel.h>
36 #include <sys/module.h>
37 #include <sys/bus.h>
38 #include <sys/resource.h>
39 #include <sys/rman.h>
40 #include <sys/lock.h>
41 #include <sys/mutex.h>
42
43 #include <machine/bus.h>
44 #include <machine/cpu.h>
45 #include <machine/fdt.h>
46 #include <machine/resource.h>
47 #include <machine/intr.h>
48
49 #include <dev/fdt/simplebus.h>
50 #include <dev/fdt/fdt_common.h>
51 #include <dev/ofw/ofw_bus_subr.h>
52
53 #include <arm/ti/tivar.h>
54 #include <arm/ti/ti_cpuid.h>
55
56 #include <arm/ti/omap4/omap4_reg.h>
57 #include <arm/ti/am335x/am335x_reg.h>
58
59 #define OMAP4_STD_FUSE_DIE_ID_0 0x2200
60 #define OMAP4_ID_CODE 0x2204
61 #define OMAP4_STD_FUSE_DIE_ID_1 0x2208
62 #define OMAP4_STD_FUSE_DIE_ID_2 0x220C
63 #define OMAP4_STD_FUSE_DIE_ID_3 0x2210
64 #define OMAP4_STD_FUSE_PROD_ID_0 0x2214
65 #define OMAP4_STD_FUSE_PROD_ID_1 0x2218
66
67 #define OMAP3_ID_CODE 0xA204
68
69 static uint32_t chip_revision = 0xffffffff;
70
71 /**
72 * ti_revision - Returns the revision number of the device
73 *
74 * Simply returns an identifier for the revision of the chip we are running
75 * on.
76 *
77 * RETURNS
78 * A 32-bit identifier for the current chip
79 */
80 uint32_t
81 ti_revision(void)
82 {
83 return chip_revision;
84 }
85
86 /**
87 * omap4_get_revision - determines omap4 revision
88 *
89 * Reads the registers to determine the revision of the chip we are currently
90 * running on. Stores the information in global variables.
91 *
92 *
93 */
94 static void
95 omap4_get_revision(void)
96 {
97 uint32_t id_code;
98 uint32_t revision;
99 uint32_t hawkeye;
100 bus_space_handle_t bsh;
101
102 /* The chip revsion is read from the device identification registers and
103 * the JTAG (?) tap registers, which are located in address 0x4A00_2200 to
104 * 0x4A00_2218. This is part of the L4_CORE memory range and should have
105 * been mapped in by the machdep.c code.
106 *
107 * STD_FUSE_DIE_ID_0 0x4A00 2200
108 * ID_CODE 0x4A00 2204 (this is the only one we need)
109 * STD_FUSE_DIE_ID_1 0x4A00 2208
110 * STD_FUSE_DIE_ID_2 0x4A00 220C
111 * STD_FUSE_DIE_ID_3 0x4A00 2210
112 * STD_FUSE_PROD_ID_0 0x4A00 2214
113 * STD_FUSE_PROD_ID_1 0x4A00 2218
114 */
115 /* FIXME Should we map somewhere else? */
116 bus_space_map(fdtbus_bs_tag,OMAP44XX_L4_CORE_HWBASE, 0x4000, 0, &bsh);
117 id_code = bus_space_read_4(fdtbus_bs_tag, bsh, OMAP4_ID_CODE);
118 bus_space_unmap(fdtbus_bs_tag, bsh, 0x4000);
119
120 hawkeye = ((id_code >> 12) & 0xffff);
121 revision = ((id_code >> 28) & 0xf);
122
123 /* Apparently according to the linux code there were some ES2.0 samples that
124 * have the wrong id code and report themselves as ES1.0 silicon. So used
125 * the ARM cpuid to get the correct revision.
126 */
127 if (revision == 0) {
128 id_code = cp15_midr_get();
129 revision = (id_code & 0xf) - 1;
130 }
131
132 switch (hawkeye) {
133 case 0xB852:
134 switch (revision) {
135 case 0:
136 chip_revision = OMAP4430_REV_ES1_0;
137 break;
138 case 1:
139 chip_revision = OMAP4430_REV_ES2_1;
140 break;
141 default:
142 chip_revision = OMAP4430_REV_UNKNOWN;
143 break;
144 }
145 break;
146
147 case 0xB95C:
148 switch (revision) {
149 case 3:
150 chip_revision = OMAP4430_REV_ES2_1;
151 break;
152 case 4:
153 chip_revision = OMAP4430_REV_ES2_2;
154 break;
155 case 6:
156 chip_revision = OMAP4430_REV_ES2_3;
157 break;
158 default:
159 chip_revision = OMAP4430_REV_UNKNOWN;
160 break;
161 }
162 break;
163
164 case 0xB94E:
165 switch (revision) {
166 case 0:
167 chip_revision = OMAP4460_REV_ES1_0;
168 break;
169 case 2:
170 chip_revision = OMAP4460_REV_ES1_1;
171 break;
172 default:
173 chip_revision = OMAP4460_REV_UNKNOWN;
174 break;
175 }
176 break;
177
178 case 0xB975:
179 switch (revision) {
180 case 0:
181 chip_revision = OMAP4470_REV_ES1_0;
182 break;
183 default:
184 chip_revision = OMAP4470_REV_UNKNOWN;
185 break;
186 }
187 break;
188
189 default:
190 /* Default to the latest revision if we can't determine type */
191 chip_revision = OMAP_UNKNOWN_DEV;
192 break;
193 }
194 if (chip_revision != OMAP_UNKNOWN_DEV) {
195 printf("Texas Instruments OMAP%04x Processor, Revision ES%u.%u\n",
196 OMAP_REV_DEVICE(chip_revision), OMAP_REV_MAJOR(chip_revision),
197 OMAP_REV_MINOR(chip_revision));
198 }
199 else {
200 printf("Texas Instruments unknown OMAP chip: %04x, rev %d\n",
201 hawkeye, revision);
202 }
203 }
204
205 static void
206 am335x_get_revision(void)
207 {
208 uint32_t dev_feature;
209 char cpu_last_char;
210 bus_space_handle_t bsh;
211 int major;
212 int minor;
213
214 bus_space_map(fdtbus_bs_tag, AM335X_CONTROL_BASE, AM335X_CONTROL_SIZE, 0, &bsh);
215 chip_revision = bus_space_read_4(fdtbus_bs_tag, bsh, AM335X_CONTROL_DEVICE_ID);
216 dev_feature = bus_space_read_4(fdtbus_bs_tag, bsh, AM335X_CONTROL_DEV_FEATURE);
217 bus_space_unmap(fdtbus_bs_tag, bsh, AM335X_CONTROL_SIZE);
218
219 switch (dev_feature) {
220 case 0x00FF0382:
221 cpu_last_char='2';
222 break;
223 case 0x20FF0382:
224 cpu_last_char='4';
225 break;
226 case 0x00FF0383:
227 cpu_last_char='6';
228 break;
229 case 0x00FE0383:
230 cpu_last_char='7';
231 break;
232 case 0x20FF0383:
233 cpu_last_char='8';
234 break;
235 case 0x20FE0383:
236 cpu_last_char='9';
237 break;
238 default:
239 cpu_last_char='x';
240 }
241
242 switch(AM335X_DEVREV(chip_revision)) {
243 case 0:
244 major = 1;
245 minor = 0;
246 break;
247 case 1:
248 major = 2;
249 minor = 0;
250 break;
251 case 2:
252 major = 2;
253 minor = 1;
254 break;
255 default:
256 major = 0;
257 minor = AM335X_DEVREV(chip_revision);
258 break;
259 }
260 printf("Texas Instruments AM335%c Processor, Revision ES%u.%u\n",
261 cpu_last_char, major, minor);
262 }
263
264 /**
265 * ti_cpu_ident - attempts to identify the chip we are running on
266 * @dummy: ignored
267 *
268 * This function is called before any of the driver are initialised, however
269 * the basic virt to phys maps have been setup in machdep.c so we can still
270 * access the required registers, we just have to use direct register reads
271 * and writes rather than going through the bus stuff.
272 *
273 *
274 */
275 static void
276 ti_cpu_ident(void *dummy)
277 {
278 if (!ti_soc_is_supported())
279 return;
280 switch(ti_chip()) {
281 case CHIP_OMAP_4:
282 omap4_get_revision();
283 break;
284 case CHIP_AM335X:
285 am335x_get_revision();
286 break;
287 default:
288 panic("Unknown chip type, fixme!\n");
289 }
290 }
291
292 SYSINIT(ti_cpu_ident, SI_SUB_CPU, SI_ORDER_SECOND, ti_cpu_ident, NULL);
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