1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
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/param.h>
31 #include <sys/systm.h>
32 #include <sys/kernel.h>
33 #include <sys/module.h>
34 #include <sys/bus.h>
35 #include <sys/resource.h>
36 #include <sys/rman.h>
37 #include <sys/lock.h>
38 #include <sys/mutex.h>
39
40 #include <machine/bus.h>
41 #include <machine/cpu.h>
42 #include <machine/fdt.h>
43 #include <machine/resource.h>
44 #include <machine/intr.h>
45
46 #include <dev/fdt/simplebus.h>
47 #include <dev/fdt/fdt_common.h>
48 #include <dev/ofw/ofw_bus_subr.h>
49
50 #include <arm/ti/tivar.h>
51 #include <arm/ti/ti_cpuid.h>
52
53 #include <arm/ti/omap4/omap4_reg.h>
54 #include <arm/ti/am335x/am335x_reg.h>
55
56 #define OMAP4_STD_FUSE_DIE_ID_0 0x2200
57 #define OMAP4_ID_CODE 0x2204
58 #define OMAP4_STD_FUSE_DIE_ID_1 0x2208
59 #define OMAP4_STD_FUSE_DIE_ID_2 0x220C
60 #define OMAP4_STD_FUSE_DIE_ID_3 0x2210
61 #define OMAP4_STD_FUSE_PROD_ID_0 0x2214
62 #define OMAP4_STD_FUSE_PROD_ID_1 0x2218
63
64 #define OMAP3_ID_CODE 0xA204
65
66 static uint32_t chip_revision = 0xffffffff;
67
68 /**
69 * ti_revision - Returns the revision number of the device
70 *
71 * Simply returns an identifier for the revision of the chip we are running
72 * on.
73 *
74 * RETURNS
75 * A 32-bit identifier for the current chip
76 */
77 uint32_t
ti_revision(void)78 ti_revision(void)
79 {
80 return chip_revision;
81 }
82
83 /**
84 * omap4_get_revision - determines omap4 revision
85 *
86 * Reads the registers to determine the revision of the chip we are currently
87 * running on. Stores the information in global variables.
88 *
89 *
90 */
91 static void
omap4_get_revision(void)92 omap4_get_revision(void)
93 {
94 uint32_t id_code;
95 uint32_t revision;
96 uint32_t hawkeye;
97 bus_space_handle_t bsh;
98
99 /* The chip revsion is read from the device identification registers and
100 * the JTAG (?) tap registers, which are located in address 0x4A00_2200 to
101 * 0x4A00_2218. This is part of the L4_CORE memory range and should have
102 * been mapped in by the machdep.c code.
103 *
104 * STD_FUSE_DIE_ID_0 0x4A00 2200
105 * ID_CODE 0x4A00 2204 (this is the only one we need)
106 * STD_FUSE_DIE_ID_1 0x4A00 2208
107 * STD_FUSE_DIE_ID_2 0x4A00 220C
108 * STD_FUSE_DIE_ID_3 0x4A00 2210
109 * STD_FUSE_PROD_ID_0 0x4A00 2214
110 * STD_FUSE_PROD_ID_1 0x4A00 2218
111 */
112 /* FIXME Should we map somewhere else? */
113 bus_space_map(fdtbus_bs_tag,OMAP44XX_L4_CORE_HWBASE, 0x4000, 0, &bsh);
114 id_code = bus_space_read_4(fdtbus_bs_tag, bsh, OMAP4_ID_CODE);
115 bus_space_unmap(fdtbus_bs_tag, bsh, 0x4000);
116
117 hawkeye = ((id_code >> 12) & 0xffff);
118 revision = ((id_code >> 28) & 0xf);
119
120 /* Apparently according to the linux code there were some ES2.0 samples that
121 * have the wrong id code and report themselves as ES1.0 silicon. So used
122 * the ARM cpuid to get the correct revision.
123 */
124 if (revision == 0) {
125 id_code = cp15_midr_get();
126 revision = (id_code & 0xf) - 1;
127 }
128
129 switch (hawkeye) {
130 case 0xB852:
131 switch (revision) {
132 case 0:
133 chip_revision = OMAP4430_REV_ES1_0;
134 break;
135 case 1:
136 chip_revision = OMAP4430_REV_ES2_1;
137 break;
138 default:
139 chip_revision = OMAP4430_REV_UNKNOWN;
140 break;
141 }
142 break;
143
144 case 0xB95C:
145 switch (revision) {
146 case 3:
147 chip_revision = OMAP4430_REV_ES2_1;
148 break;
149 case 4:
150 chip_revision = OMAP4430_REV_ES2_2;
151 break;
152 case 6:
153 chip_revision = OMAP4430_REV_ES2_3;
154 break;
155 default:
156 chip_revision = OMAP4430_REV_UNKNOWN;
157 break;
158 }
159 break;
160
161 case 0xB94E:
162 switch (revision) {
163 case 0:
164 chip_revision = OMAP4460_REV_ES1_0;
165 break;
166 case 2:
167 chip_revision = OMAP4460_REV_ES1_1;
168 break;
169 default:
170 chip_revision = OMAP4460_REV_UNKNOWN;
171 break;
172 }
173 break;
174
175 case 0xB975:
176 switch (revision) {
177 case 0:
178 chip_revision = OMAP4470_REV_ES1_0;
179 break;
180 default:
181 chip_revision = OMAP4470_REV_UNKNOWN;
182 break;
183 }
184 break;
185
186 default:
187 /* Default to the latest revision if we can't determine type */
188 chip_revision = OMAP_UNKNOWN_DEV;
189 break;
190 }
191 if (chip_revision != OMAP_UNKNOWN_DEV) {
192 printf("Texas Instruments OMAP%04x Processor, Revision ES%u.%u\n",
193 OMAP_REV_DEVICE(chip_revision), OMAP_REV_MAJOR(chip_revision),
194 OMAP_REV_MINOR(chip_revision));
195 }
196 else {
197 printf("Texas Instruments unknown OMAP chip: %04x, rev %d\n",
198 hawkeye, revision);
199 }
200 }
201
202 static void
am335x_get_revision(void)203 am335x_get_revision(void)
204 {
205 uint32_t dev_feature;
206 char cpu_last_char;
207 bus_space_handle_t bsh;
208 int major;
209 int minor;
210
211 bus_space_map(fdtbus_bs_tag, AM335X_CONTROL_BASE, AM335X_CONTROL_SIZE, 0, &bsh);
212 chip_revision = bus_space_read_4(fdtbus_bs_tag, bsh, AM335X_CONTROL_DEVICE_ID);
213 dev_feature = bus_space_read_4(fdtbus_bs_tag, bsh, AM335X_CONTROL_DEV_FEATURE);
214 bus_space_unmap(fdtbus_bs_tag, bsh, AM335X_CONTROL_SIZE);
215
216 switch (dev_feature) {
217 case 0x00FF0382:
218 cpu_last_char='2';
219 break;
220 case 0x20FF0382:
221 cpu_last_char='4';
222 break;
223 case 0x00FF0383:
224 cpu_last_char='6';
225 break;
226 case 0x00FE0383:
227 cpu_last_char='7';
228 break;
229 case 0x20FF0383:
230 cpu_last_char='8';
231 break;
232 case 0x20FE0383:
233 cpu_last_char='9';
234 break;
235 default:
236 cpu_last_char='x';
237 }
238
239 switch(AM335X_DEVREV(chip_revision)) {
240 case 0:
241 major = 1;
242 minor = 0;
243 break;
244 case 1:
245 major = 2;
246 minor = 0;
247 break;
248 case 2:
249 major = 2;
250 minor = 1;
251 break;
252 default:
253 major = 0;
254 minor = AM335X_DEVREV(chip_revision);
255 break;
256 }
257 printf("Texas Instruments AM335%c Processor, Revision ES%u.%u\n",
258 cpu_last_char, major, minor);
259 }
260
261 /**
262 * ti_cpu_ident - attempts to identify the chip we are running on
263 * @dummy: ignored
264 *
265 * This function is called before any of the driver are initialised, however
266 * the basic virt to phys maps have been setup in machdep.c so we can still
267 * access the required registers, we just have to use direct register reads
268 * and writes rather than going through the bus stuff.
269 *
270 *
271 */
272 static void
ti_cpu_ident(void * dummy)273 ti_cpu_ident(void *dummy)
274 {
275 if (!ti_soc_is_supported())
276 return;
277 switch(ti_chip()) {
278 case CHIP_OMAP_4:
279 omap4_get_revision();
280 break;
281 case CHIP_AM335X:
282 am335x_get_revision();
283 break;
284 default:
285 panic("Unknown chip type, fixme!\n");
286 }
287 }
288
289 SYSINIT(ti_cpu_ident, SI_SUB_CPU, SI_ORDER_SECOND, ti_cpu_ident, NULL);
290