1 /*- 2 * Copyright (c) 2011 3 * Ben Gray <ben.r.gray@gmail.com>. 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 */ 27 28 #include <sys/cdefs.h> 29 __FBSDID("$FreeBSD$"); 30 31 #include <sys/param.h> 32 #include <sys/systm.h> 33 #include <sys/kernel.h> 34 #include <sys/module.h> 35 #include <sys/bus.h> 36 #include <sys/resource.h> 37 #include <sys/rman.h> 38 #include <sys/lock.h> 39 #include <sys/mutex.h> 40 41 #include <machine/bus.h> 42 #include <machine/fdt.h> 43 #include <machine/cpu.h> 44 #include <machine/cpufunc.h> 45 #include <machine/resource.h> 46 #include <machine/intr.h> 47 48 #include <arm/ti/tivar.h> 49 #include <arm/ti/ti_cpuid.h> 50 51 #include <arm/ti/omap4/omap4_reg.h> 52 #include <arm/ti/am335x/am335x_reg.h> 53 54 #define OMAP4_STD_FUSE_DIE_ID_0 0x2200 55 #define OMAP4_ID_CODE 0x2204 56 #define OMAP4_STD_FUSE_DIE_ID_1 0x2208 57 #define OMAP4_STD_FUSE_DIE_ID_2 0x220C 58 #define OMAP4_STD_FUSE_DIE_ID_3 0x2210 59 #define OMAP4_STD_FUSE_PROD_ID_0 0x2214 60 #define OMAP4_STD_FUSE_PROD_ID_1 0x2218 61 62 #define OMAP3_ID_CODE 0xA204 63 64 static uint32_t chip_revision = 0xffffffff; 65 66 /** 67 * ti_revision - Returns the revision number of the device 68 * 69 * Simply returns an identifier for the revision of the chip we are running 70 * on. 71 * 72 * RETURNS 73 * A 32-bit identifier for the current chip 74 */ 75 uint32_t 76 ti_revision(void) 77 { 78 return chip_revision; 79 } 80 81 /** 82 * omap4_get_revision - determines omap4 revision 83 * 84 * Reads the registers to determine the revision of the chip we are currently 85 * running on. Stores the information in global variables. 86 * 87 * 88 */ 89 static void 90 omap4_get_revision(void) 91 { 92 uint32_t id_code; 93 uint32_t revision; 94 uint32_t hawkeye; 95 bus_space_handle_t bsh; 96 97 /* The chip revsion is read from the device identification registers and 98 * the JTAG (?) tap registers, which are located in address 0x4A00_2200 to 99 * 0x4A00_2218. This is part of the L4_CORE memory range and should have 100 * been mapped in by the machdep.c code. 101 * 102 * STD_FUSE_DIE_ID_0 0x4A00 2200 103 * ID_CODE 0x4A00 2204 (this is the only one we need) 104 * STD_FUSE_DIE_ID_1 0x4A00 2208 105 * STD_FUSE_DIE_ID_2 0x4A00 220C 106 * STD_FUSE_DIE_ID_3 0x4A00 2210 107 * STD_FUSE_PROD_ID_0 0x4A00 2214 108 * STD_FUSE_PROD_ID_1 0x4A00 2218 109 */ 110 /* FIXME Should we map somewhere else? */ 111 bus_space_map(fdtbus_bs_tag,OMAP44XX_L4_CORE_HWBASE, 0x4000, 0, &bsh); 112 id_code = bus_space_read_4(fdtbus_bs_tag, bsh, OMAP4_ID_CODE); 113 bus_space_unmap(fdtbus_bs_tag, bsh, 0x4000); 114 115 hawkeye = ((id_code >> 12) & 0xffff); 116 revision = ((id_code >> 28) & 0xf); 117 118 /* Apparently according to the linux code there were some ES2.0 samples that 119 * have the wrong id code and report themselves as ES1.0 silicon. So used 120 * the ARM cpuid to get the correct revision. 121 */ 122 if (revision == 0) { 123 id_code = cpu_ident(); 124 revision = (id_code & 0xf) - 1; 125 } 126 127 switch (hawkeye) { 128 case 0xB852: 129 switch (revision) { 130 case 0: 131 chip_revision = OMAP4430_REV_ES1_0; 132 break; 133 case 1: 134 chip_revision = OMAP4430_REV_ES2_1; 135 break; 136 default: 137 chip_revision = OMAP4430_REV_UNKNOWN; 138 break; 139 } 140 break; 141 142 case 0xB95C: 143 switch (revision) { 144 case 3: 145 chip_revision = OMAP4430_REV_ES2_1; 146 break; 147 case 4: 148 chip_revision = OMAP4430_REV_ES2_2; 149 break; 150 case 6: 151 chip_revision = OMAP4430_REV_ES2_3; 152 break; 153 default: 154 chip_revision = OMAP4430_REV_UNKNOWN; 155 break; 156 } 157 break; 158 159 case 0xB94E: 160 switch (revision) { 161 case 0: 162 chip_revision = OMAP4460_REV_ES1_0; 163 break; 164 case 2: 165 chip_revision = OMAP4460_REV_ES1_1; 166 break; 167 default: 168 chip_revision = OMAP4460_REV_UNKNOWN; 169 break; 170 } 171 break; 172 173 case 0xB975: 174 switch (revision) { 175 case 0: 176 chip_revision = OMAP4470_REV_ES1_0; 177 break; 178 default: 179 chip_revision = OMAP4470_REV_UNKNOWN; 180 break; 181 } 182 break; 183 184 default: 185 /* Default to the latest revision if we can't determine type */ 186 chip_revision = OMAP_UNKNOWN_DEV; 187 break; 188 } 189 if (chip_revision != OMAP_UNKNOWN_DEV) { 190 printf("Texas Instruments OMAP%04x Processor, Revision ES%u.%u\n", 191 OMAP_REV_DEVICE(chip_revision), OMAP_REV_MAJOR(chip_revision), 192 OMAP_REV_MINOR(chip_revision)); 193 } 194 else { 195 printf("Texas Instruments unknown OMAP chip: %04x, rev %d\n", 196 hawkeye, revision); 197 } 198 } 199 200 static void 201 am335x_get_revision(void) 202 { 203 uint32_t dev_feature; 204 uint8_t cpu_last_char; 205 bus_space_handle_t bsh; 206 207 bus_space_map(fdtbus_bs_tag, AM335X_CONTROL_BASE, AM335X_CONTROL_SIZE, 0, &bsh); 208 chip_revision = bus_space_read_4(fdtbus_bs_tag, bsh, AM335X_CONTROL_DEVICE_ID); 209 dev_feature = bus_space_read_4(fdtbus_bs_tag, bsh, AM335X_CONTROL_DEV_FEATURE); 210 bus_space_unmap(fdtbus_bs_tag, bsh, AM335X_CONTROL_SIZE); 211 212 switch (dev_feature) { 213 case 0x00FF0382: 214 cpu_last_char='2'; 215 break; 216 case 0x20FF0382: 217 cpu_last_char='4'; 218 break; 219 case 0x00FF0383: 220 cpu_last_char='6'; 221 break; 222 case 0x00FE0383: 223 cpu_last_char='7'; 224 break; 225 case 0x20FF0383: 226 cpu_last_char='8'; 227 break; 228 case 0x20FE0383: 229 cpu_last_char='9'; 230 break; 231 default: 232 cpu_last_char='x'; 233 } 234 235 printf("Texas Instruments AM335%c Processor, Revision ES1.%u\n", 236 cpu_last_char, AM335X_DEVREV(chip_revision)); 237 } 238 239 /** 240 * ti_cpu_ident - attempts to identify the chip we are running on 241 * @dummy: ignored 242 * 243 * This function is called before any of the driver are initialised, however 244 * the basic virt to phys maps have been setup in machdep.c so we can still 245 * access the required registers, we just have to use direct register reads 246 * and writes rather than going through the bus stuff. 247 * 248 * 249 */ 250 static void 251 ti_cpu_ident(void *dummy) 252 { 253 switch(ti_chip()) { 254 case CHIP_OMAP_4: 255 omap4_get_revision(); 256 break; 257 case CHIP_AM335X: 258 am335x_get_revision(); 259 break; 260 default: 261 panic("Unknown chip type, fixme!\n"); 262 } 263 } 264 265 SYSINIT(ti_cpu_ident, SI_SUB_CPU, SI_ORDER_SECOND, ti_cpu_ident, NULL); 266