1 /* 2 * Copyright 2008 Extreme Engineering Solutions, Inc. 3 * 4 * SPDX-License-Identifier: GPL-2.0 5 */ 6 7 /* 8 * Driver for DS4510, a CPU supervisor with integrated EEPROM, SRAM, 9 * and 4 programmable non-volatile GPIO pins. 10 */ 11 12 #include <common.h> 13 #include <i2c.h> 14 #include <command.h> 15 #include "ds4510.h" 16 17 /* Default to an address that hopefully won't corrupt other i2c devices */ 18 #ifndef CONFIG_SYS_I2C_DS4510_ADDR 19 #define CONFIG_SYS_I2C_DS4510_ADDR (~0) 20 #endif 21 22 enum { 23 DS4510_CMD_INFO, 24 DS4510_CMD_DEVICE, 25 DS4510_CMD_NV, 26 DS4510_CMD_RSTDELAY, 27 DS4510_CMD_OUTPUT, 28 DS4510_CMD_INPUT, 29 DS4510_CMD_PULLUP, 30 DS4510_CMD_EEPROM, 31 DS4510_CMD_SEEPROM, 32 DS4510_CMD_SRAM, 33 }; 34 35 /* 36 * Write to DS4510, taking page boundaries into account 37 */ 38 static int ds4510_mem_write(uint8_t chip, int offset, uint8_t *buf, int count) 39 { 40 int wrlen; 41 int i = 0; 42 43 do { 44 wrlen = DS4510_EEPROM_PAGE_SIZE - 45 DS4510_EEPROM_PAGE_OFFSET(offset); 46 if (count < wrlen) 47 wrlen = count; 48 if (i2c_write(chip, offset, 1, &buf[i], wrlen)) 49 return -1; 50 51 /* 52 * This delay isn't needed for SRAM writes but shouldn't delay 53 * things too much, so do it unconditionally for simplicity 54 */ 55 udelay(DS4510_EEPROM_PAGE_WRITE_DELAY_MS * 1000); 56 count -= wrlen; 57 offset += wrlen; 58 i += wrlen; 59 } while (count > 0); 60 61 return 0; 62 } 63 64 /* 65 * General read from DS4510 66 */ 67 static int ds4510_mem_read(uint8_t chip, int offset, uint8_t *buf, int count) 68 { 69 return i2c_read(chip, offset, 1, buf, count); 70 } 71 72 /* 73 * Write SEE bit in config register. 74 * nv = 0 - Writes to SEEPROM registers behave like EEPROM 75 * nv = 1 - Writes to SEEPROM registers behave like SRAM 76 */ 77 static int ds4510_see_write(uint8_t chip, uint8_t nv) 78 { 79 uint8_t data; 80 81 if (i2c_read(chip, DS4510_CFG, 1, &data, 1)) 82 return -1; 83 84 if (nv) /* Treat SEEPROM bits as EEPROM */ 85 data &= ~DS4510_CFG_SEE; 86 else /* Treat SEEPROM bits as SRAM */ 87 data |= DS4510_CFG_SEE; 88 89 return ds4510_mem_write(chip, DS4510_CFG, &data, 1); 90 } 91 92 /* 93 * Write de-assertion of reset signal delay 94 */ 95 static int ds4510_rstdelay_write(uint8_t chip, uint8_t delay) 96 { 97 uint8_t data; 98 99 if (i2c_read(chip, DS4510_RSTDELAY, 1, &data, 1)) 100 return -1; 101 102 data &= ~DS4510_RSTDELAY_MASK; 103 data |= delay & DS4510_RSTDELAY_MASK; 104 105 return ds4510_mem_write(chip, DS4510_RSTDELAY, &data, 1); 106 } 107 108 /* 109 * Write pullup characteristics of IO pins 110 */ 111 static int ds4510_pullup_write(uint8_t chip, uint8_t val) 112 { 113 val &= DS4510_IO_MASK; 114 115 return ds4510_mem_write(chip, DS4510_PULLUP, (uint8_t *)&val, 1); 116 } 117 118 /* 119 * Read pullup characteristics of IO pins 120 */ 121 static int ds4510_pullup_read(uint8_t chip) 122 { 123 uint8_t val; 124 125 if (i2c_read(chip, DS4510_PULLUP, 1, &val, 1)) 126 return -1; 127 128 return val & DS4510_IO_MASK; 129 } 130 131 /* 132 * Write drive level of IO pins 133 */ 134 static int ds4510_gpio_write(uint8_t chip, uint8_t val) 135 { 136 uint8_t data; 137 int i; 138 139 for (i = 0; i < DS4510_NUM_IO; i++) { 140 if (i2c_read(chip, DS4510_IO0 - i, 1, &data, 1)) 141 return -1; 142 143 if (val & (0x1 << i)) 144 data |= 0x1; 145 else 146 data &= ~0x1; 147 148 if (ds4510_mem_write(chip, DS4510_IO0 - i, &data, 1)) 149 return -1; 150 } 151 152 return 0; 153 } 154 155 /* 156 * Read drive level of IO pins 157 */ 158 static int ds4510_gpio_read(uint8_t chip) 159 { 160 uint8_t data; 161 int val = 0; 162 int i; 163 164 for (i = 0; i < DS4510_NUM_IO; i++) { 165 if (i2c_read(chip, DS4510_IO0 - i, 1, &data, 1)) 166 return -1; 167 168 if (data & 1) 169 val |= (1 << i); 170 } 171 172 return val; 173 } 174 175 /* 176 * Read physical level of IO pins 177 */ 178 static int ds4510_gpio_read_val(uint8_t chip) 179 { 180 uint8_t val; 181 182 if (i2c_read(chip, DS4510_IO_STATUS, 1, &val, 1)) 183 return -1; 184 185 return val & DS4510_IO_MASK; 186 } 187 188 /* 189 * Display DS4510 information 190 */ 191 static int ds4510_info(uint8_t chip) 192 { 193 int i; 194 int tmp; 195 uint8_t data; 196 197 printf("DS4510 @ 0x%x:\n\n", chip); 198 199 if (i2c_read(chip, DS4510_RSTDELAY, 1, &data, 1)) 200 return -1; 201 printf("rstdelay = 0x%x\n\n", data & DS4510_RSTDELAY_MASK); 202 203 if (i2c_read(chip, DS4510_CFG, 1, &data, 1)) 204 return -1; 205 printf("config = 0x%x\n", data); 206 printf(" /ready = %d\n", data & DS4510_CFG_READY ? 1 : 0); 207 printf(" trip pt = %d\n", data & DS4510_CFG_TRIP_POINT ? 1 : 0); 208 printf(" rst sts = %d\n", data & DS4510_CFG_RESET ? 1 : 0); 209 printf(" /see = %d\n", data & DS4510_CFG_SEE ? 1 : 0); 210 printf(" swrst = %d\n\n", data & DS4510_CFG_SWRST ? 1 : 0); 211 212 printf("gpio pins: 3210\n"); 213 printf("---------------\n"); 214 printf("pullup "); 215 216 tmp = ds4510_pullup_read(chip); 217 if (tmp == -1) 218 return tmp; 219 for (i = DS4510_NUM_IO - 1; i >= 0; i--) 220 printf("%d", (tmp & (1 << i)) ? 1 : 0); 221 printf("\n"); 222 223 printf("driven "); 224 tmp = ds4510_gpio_read(chip); 225 if (tmp == -1) 226 return -1; 227 for (i = DS4510_NUM_IO - 1; i >= 0; i--) 228 printf("%d", (tmp & (1 << i)) ? 1 : 0); 229 printf("\n"); 230 231 printf("read "); 232 tmp = ds4510_gpio_read_val(chip); 233 if (tmp == -1) 234 return -1; 235 for (i = DS4510_NUM_IO - 1; i >= 0; i--) 236 printf("%d", (tmp & (1 << i)) ? 1 : 0); 237 printf("\n"); 238 239 return 0; 240 } 241 242 cmd_tbl_t cmd_ds4510[] = { 243 U_BOOT_CMD_MKENT(device, 3, 0, (void *)DS4510_CMD_DEVICE, "", ""), 244 U_BOOT_CMD_MKENT(nv, 3, 0, (void *)DS4510_CMD_NV, "", ""), 245 U_BOOT_CMD_MKENT(output, 4, 0, (void *)DS4510_CMD_OUTPUT, "", ""), 246 U_BOOT_CMD_MKENT(input, 3, 0, (void *)DS4510_CMD_INPUT, "", ""), 247 U_BOOT_CMD_MKENT(pullup, 4, 0, (void *)DS4510_CMD_PULLUP, "", ""), 248 U_BOOT_CMD_MKENT(info, 2, 0, (void *)DS4510_CMD_INFO, "", ""), 249 U_BOOT_CMD_MKENT(rstdelay, 3, 0, (void *)DS4510_CMD_RSTDELAY, "", ""), 250 U_BOOT_CMD_MKENT(eeprom, 6, 0, (void *)DS4510_CMD_EEPROM, "", ""), 251 U_BOOT_CMD_MKENT(seeprom, 6, 0, (void *)DS4510_CMD_SEEPROM, "", ""), 252 U_BOOT_CMD_MKENT(sram, 6, 0, (void *)DS4510_CMD_SRAM, "", ""), 253 }; 254 255 int do_ds4510(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) 256 { 257 static uint8_t chip = CONFIG_SYS_I2C_DS4510_ADDR; 258 cmd_tbl_t *c; 259 ulong ul_arg2 = 0; 260 ulong ul_arg3 = 0; 261 int tmp; 262 ulong addr; 263 ulong off; 264 ulong cnt; 265 int end; 266 int (*rw_func)(uint8_t, int, uint8_t *, int); 267 268 c = find_cmd_tbl(argv[1], cmd_ds4510, ARRAY_SIZE(cmd_ds4510)); 269 270 /* All commands but "device" require 'maxargs' arguments */ 271 if (!c || !((argc == (c->maxargs)) || 272 (((int)c->cmd == DS4510_CMD_DEVICE) && 273 (argc == (c->maxargs - 1))))) { 274 return cmd_usage(cmdtp); 275 } 276 277 /* arg2 used as chip addr and pin number */ 278 if (argc > 2) 279 ul_arg2 = simple_strtoul(argv[2], NULL, 16); 280 281 /* arg3 used as output/pullup value */ 282 if (argc > 3) 283 ul_arg3 = simple_strtoul(argv[3], NULL, 16); 284 285 switch ((int)c->cmd) { 286 case DS4510_CMD_DEVICE: 287 if (argc == 3) 288 chip = ul_arg2; 289 printf("Current device address: 0x%x\n", chip); 290 return 0; 291 case DS4510_CMD_NV: 292 return ds4510_see_write(chip, ul_arg2); 293 case DS4510_CMD_OUTPUT: 294 tmp = ds4510_gpio_read(chip); 295 if (tmp == -1) 296 return -1; 297 if (ul_arg3) 298 tmp |= (1 << ul_arg2); 299 else 300 tmp &= ~(1 << ul_arg2); 301 return ds4510_gpio_write(chip, tmp); 302 case DS4510_CMD_INPUT: 303 tmp = ds4510_gpio_read_val(chip); 304 if (tmp == -1) 305 return -1; 306 return (tmp & (1 << ul_arg2)) != 0; 307 case DS4510_CMD_PULLUP: 308 tmp = ds4510_pullup_read(chip); 309 if (tmp == -1) 310 return -1; 311 if (ul_arg3) 312 tmp |= (1 << ul_arg2); 313 else 314 tmp &= ~(1 << ul_arg2); 315 return ds4510_pullup_write(chip, tmp); 316 case DS4510_CMD_INFO: 317 return ds4510_info(chip); 318 case DS4510_CMD_RSTDELAY: 319 return ds4510_rstdelay_write(chip, ul_arg2); 320 case DS4510_CMD_EEPROM: 321 end = DS4510_EEPROM + DS4510_EEPROM_SIZE; 322 off = DS4510_EEPROM; 323 break; 324 case DS4510_CMD_SEEPROM: 325 end = DS4510_SEEPROM + DS4510_SEEPROM_SIZE; 326 off = DS4510_SEEPROM; 327 break; 328 case DS4510_CMD_SRAM: 329 end = DS4510_SRAM + DS4510_SRAM_SIZE; 330 off = DS4510_SRAM; 331 break; 332 default: 333 /* We should never get here... */ 334 return 1; 335 } 336 337 /* Only eeprom, seeprom, and sram commands should make it here */ 338 if (strcmp(argv[2], "read") == 0) 339 rw_func = ds4510_mem_read; 340 else if (strcmp(argv[2], "write") == 0) 341 rw_func = ds4510_mem_write; 342 else 343 return cmd_usage(cmdtp); 344 345 addr = simple_strtoul(argv[3], NULL, 16); 346 off += simple_strtoul(argv[4], NULL, 16); 347 cnt = simple_strtoul(argv[5], NULL, 16); 348 349 if ((off + cnt) > end) { 350 printf("ERROR: invalid len\n"); 351 return -1; 352 } 353 354 return rw_func(chip, off, (uint8_t *)addr, cnt); 355 } 356 357 U_BOOT_CMD( 358 ds4510, 6, 1, do_ds4510, 359 "ds4510 eeprom/seeprom/sram/gpio access", 360 "device [dev]\n" 361 " - show or set current device address\n" 362 "ds4510 info\n" 363 " - display ds4510 info\n" 364 "ds4510 output pin 0|1\n" 365 " - set pin low or high-Z\n" 366 "ds4510 input pin\n" 367 " - read value of pin\n" 368 "ds4510 pullup pin 0|1\n" 369 " - disable/enable pullup on specified pin\n" 370 "ds4510 nv 0|1\n" 371 " - make gpio and seeprom writes volatile/non-volatile" 372 "\n" 373 "ds4510 rstdelay 0-3\n" 374 " - set reset output delay" 375 "\n" 376 "ds4510 eeprom read addr off cnt\n" 377 "ds4510 eeprom write addr off cnt\n" 378 " - read/write 'cnt' bytes at EEPROM offset 'off'\n" 379 "ds4510 seeprom read addr off cnt\n" 380 "ds4510 seeprom write addr off cnt\n" 381 " - read/write 'cnt' bytes at SRAM-shadowed EEPROM offset 'off'\n" 382 "ds4510 sram read addr off cnt\n" 383 "ds4510 sram write addr off cnt\n" 384 " - read/write 'cnt' bytes at SRAM offset 'off'" 385 ); 386