1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * i.MX6 OCOTP fusebox driver 4 * 5 * Copyright (c) 2015 Pengutronix, Philipp Zabel <p.zabel@pengutronix.de> 6 * 7 * Copyright 2019 NXP 8 * 9 * Based on the barebox ocotp driver, 10 * Copyright (c) 2010 Baruch Siach <baruch@tkos.co.il>, 11 * Orex Computed Radiography 12 * 13 * Write support based on the fsl_otp driver, 14 * Copyright (C) 2010-2013 Freescale Semiconductor, Inc 15 */ 16 17 #include <linux/clk.h> 18 #include <linux/device.h> 19 #include <linux/io.h> 20 #include <linux/module.h> 21 #include <linux/nvmem-provider.h> 22 #include <linux/of.h> 23 #include <linux/platform_device.h> 24 #include <linux/slab.h> 25 #include <linux/delay.h> 26 27 #define IMX_OCOTP_OFFSET_B0W0 0x400 /* Offset from base address of the 28 * OTP Bank0 Word0 29 */ 30 #define IMX_OCOTP_OFFSET_PER_WORD 0x10 /* Offset between the start addr 31 * of two consecutive OTP words. 32 */ 33 34 #define IMX_OCOTP_ADDR_CTRL 0x0000 35 #define IMX_OCOTP_ADDR_CTRL_SET 0x0004 36 #define IMX_OCOTP_ADDR_CTRL_CLR 0x0008 37 #define IMX_OCOTP_ADDR_TIMING 0x0010 38 #define IMX_OCOTP_ADDR_DATA0 0x0020 39 #define IMX_OCOTP_ADDR_DATA1 0x0030 40 #define IMX_OCOTP_ADDR_DATA2 0x0040 41 #define IMX_OCOTP_ADDR_DATA3 0x0050 42 43 #define IMX_OCOTP_BM_CTRL_ADDR 0x000000FF 44 #define IMX_OCOTP_BM_CTRL_BUSY 0x00000100 45 #define IMX_OCOTP_BM_CTRL_ERROR 0x00000200 46 #define IMX_OCOTP_BM_CTRL_REL_SHADOWS 0x00000400 47 48 #define IMX_OCOTP_BM_CTRL_ADDR_8MP 0x000001FF 49 #define IMX_OCOTP_BM_CTRL_BUSY_8MP 0x00000200 50 #define IMX_OCOTP_BM_CTRL_ERROR_8MP 0x00000400 51 #define IMX_OCOTP_BM_CTRL_REL_SHADOWS_8MP 0x00000800 52 53 #define IMX_OCOTP_BM_CTRL_DEFAULT \ 54 { \ 55 .bm_addr = IMX_OCOTP_BM_CTRL_ADDR, \ 56 .bm_busy = IMX_OCOTP_BM_CTRL_BUSY, \ 57 .bm_error = IMX_OCOTP_BM_CTRL_ERROR, \ 58 .bm_rel_shadows = IMX_OCOTP_BM_CTRL_REL_SHADOWS,\ 59 } 60 61 #define IMX_OCOTP_BM_CTRL_8MP \ 62 { \ 63 .bm_addr = IMX_OCOTP_BM_CTRL_ADDR_8MP, \ 64 .bm_busy = IMX_OCOTP_BM_CTRL_BUSY_8MP, \ 65 .bm_error = IMX_OCOTP_BM_CTRL_ERROR_8MP, \ 66 .bm_rel_shadows = IMX_OCOTP_BM_CTRL_REL_SHADOWS_8MP,\ 67 } 68 69 #define TIMING_STROBE_PROG_US 10 /* Min time to blow a fuse */ 70 #define TIMING_STROBE_READ_NS 37 /* Min time before read */ 71 #define TIMING_RELAX_NS 17 72 #define DEF_FSOURCE 1001 /* > 1000 ns */ 73 #define DEF_STROBE_PROG 10000 /* IPG clocks */ 74 #define IMX_OCOTP_WR_UNLOCK 0x3E770000 75 #define IMX_OCOTP_READ_LOCKED_VAL 0xBADABADA 76 77 static DEFINE_MUTEX(ocotp_mutex); 78 79 struct ocotp_priv { 80 struct device *dev; 81 struct clk *clk; 82 void __iomem *base; 83 const struct ocotp_params *params; 84 struct nvmem_config *config; 85 }; 86 87 struct ocotp_ctrl_reg { 88 u32 bm_addr; 89 u32 bm_busy; 90 u32 bm_error; 91 u32 bm_rel_shadows; 92 }; 93 94 struct ocotp_params { 95 unsigned int nregs; 96 unsigned int bank_address_words; 97 void (*set_timing)(struct ocotp_priv *priv); 98 struct ocotp_ctrl_reg ctrl; 99 }; 100 101 static int imx_ocotp_wait_for_busy(struct ocotp_priv *priv, u32 flags) 102 { 103 int count; 104 u32 c, mask; 105 u32 bm_ctrl_busy, bm_ctrl_error; 106 void __iomem *base = priv->base; 107 108 bm_ctrl_busy = priv->params->ctrl.bm_busy; 109 bm_ctrl_error = priv->params->ctrl.bm_error; 110 111 mask = bm_ctrl_busy | bm_ctrl_error | flags; 112 113 for (count = 10000; count >= 0; count--) { 114 c = readl(base + IMX_OCOTP_ADDR_CTRL); 115 if (!(c & mask)) 116 break; 117 cpu_relax(); 118 } 119 120 if (count < 0) { 121 /* HW_OCOTP_CTRL[ERROR] will be set under the following 122 * conditions: 123 * - A write is performed to a shadow register during a shadow 124 * reload (essentially, while HW_OCOTP_CTRL[RELOAD_SHADOWS] is 125 * set. In addition, the contents of the shadow register shall 126 * not be updated. 127 * - A write is performed to a shadow register which has been 128 * locked. 129 * - A read is performed to from a shadow register which has 130 * been read locked. 131 * - A program is performed to a fuse word which has been locked 132 * - A read is performed to from a fuse word which has been read 133 * locked. 134 */ 135 if (c & bm_ctrl_error) 136 return -EPERM; 137 return -ETIMEDOUT; 138 } 139 140 return 0; 141 } 142 143 static void imx_ocotp_clr_err_if_set(struct ocotp_priv *priv) 144 { 145 u32 c, bm_ctrl_error; 146 void __iomem *base = priv->base; 147 148 bm_ctrl_error = priv->params->ctrl.bm_error; 149 150 c = readl(base + IMX_OCOTP_ADDR_CTRL); 151 if (!(c & bm_ctrl_error)) 152 return; 153 154 writel(bm_ctrl_error, base + IMX_OCOTP_ADDR_CTRL_CLR); 155 } 156 157 static int imx_ocotp_read(void *context, unsigned int offset, 158 void *val, size_t bytes) 159 { 160 struct ocotp_priv *priv = context; 161 unsigned int count; 162 u8 *buf, *p; 163 int i, ret; 164 u32 index, num_bytes; 165 166 index = offset >> 2; 167 num_bytes = round_up((offset % 4) + bytes, 4); 168 count = num_bytes >> 2; 169 170 if (count > (priv->params->nregs - index)) 171 count = priv->params->nregs - index; 172 173 p = kzalloc(num_bytes, GFP_KERNEL); 174 if (!p) 175 return -ENOMEM; 176 177 mutex_lock(&ocotp_mutex); 178 179 buf = p; 180 181 ret = clk_prepare_enable(priv->clk); 182 if (ret < 0) { 183 mutex_unlock(&ocotp_mutex); 184 dev_err(priv->dev, "failed to prepare/enable ocotp clk\n"); 185 kfree(p); 186 return ret; 187 } 188 189 ret = imx_ocotp_wait_for_busy(priv, 0); 190 if (ret < 0) { 191 dev_err(priv->dev, "timeout during read setup\n"); 192 goto read_end; 193 } 194 195 for (i = index; i < (index + count); i++) { 196 *(u32 *)buf = readl(priv->base + IMX_OCOTP_OFFSET_B0W0 + 197 i * IMX_OCOTP_OFFSET_PER_WORD); 198 199 /* 47.3.1.2 200 * For "read locked" registers 0xBADABADA will be returned and 201 * HW_OCOTP_CTRL[ERROR] will be set. It must be cleared by 202 * software before any new write, read or reload access can be 203 * issued 204 */ 205 if (*((u32 *)buf) == IMX_OCOTP_READ_LOCKED_VAL) 206 imx_ocotp_clr_err_if_set(priv); 207 208 buf += 4; 209 } 210 211 index = offset % 4; 212 memcpy(val, &p[index], bytes); 213 214 read_end: 215 clk_disable_unprepare(priv->clk); 216 mutex_unlock(&ocotp_mutex); 217 218 kfree(p); 219 220 return ret; 221 } 222 223 static int imx_ocotp_cell_pp(void *context, const char *id, int index, 224 unsigned int offset, void *data, size_t bytes) 225 { 226 u8 *buf = data; 227 int i; 228 229 /* Deal with some post processing of nvmem cell data */ 230 if (id && !strcmp(id, "mac-address")) 231 for (i = 0; i < bytes / 2; i++) 232 swap(buf[i], buf[bytes - i - 1]); 233 234 return 0; 235 } 236 237 static void imx_ocotp_set_imx6_timing(struct ocotp_priv *priv) 238 { 239 unsigned long clk_rate; 240 unsigned long strobe_read, relax, strobe_prog; 241 u32 timing; 242 243 /* 47.3.1.3.1 244 * Program HW_OCOTP_TIMING[STROBE_PROG] and HW_OCOTP_TIMING[RELAX] 245 * fields with timing values to match the current frequency of the 246 * ipg_clk. OTP writes will work at maximum bus frequencies as long 247 * as the HW_OCOTP_TIMING parameters are set correctly. 248 * 249 * Note: there are minimum timings required to ensure an OTP fuse burns 250 * correctly that are independent of the ipg_clk. Those values are not 251 * formally documented anywhere however, working from the minimum 252 * timings given in u-boot we can say: 253 * 254 * - Minimum STROBE_PROG time is 10 microseconds. Intuitively 10 255 * microseconds feels about right as representative of a minimum time 256 * to physically burn out a fuse. 257 * 258 * - Minimum STROBE_READ i.e. the time to wait post OTP fuse burn before 259 * performing another read is 37 nanoseconds 260 * 261 * - Minimum RELAX timing is 17 nanoseconds. This final RELAX minimum 262 * timing is not entirely clear the documentation says "This 263 * count value specifies the time to add to all default timing 264 * parameters other than the Tpgm and Trd. It is given in number 265 * of ipg_clk periods." where Tpgm and Trd refer to STROBE_PROG 266 * and STROBE_READ respectively. What the other timing parameters 267 * are though, is not specified. Experience shows a zero RELAX 268 * value will mess up a re-load of the shadow registers post OTP 269 * burn. 270 */ 271 clk_rate = clk_get_rate(priv->clk); 272 273 relax = DIV_ROUND_UP(clk_rate * TIMING_RELAX_NS, 1000000000) - 1; 274 strobe_read = DIV_ROUND_UP(clk_rate * TIMING_STROBE_READ_NS, 275 1000000000); 276 strobe_read += 2 * (relax + 1) - 1; 277 strobe_prog = DIV_ROUND_CLOSEST(clk_rate * TIMING_STROBE_PROG_US, 278 1000000); 279 strobe_prog += 2 * (relax + 1) - 1; 280 281 timing = readl(priv->base + IMX_OCOTP_ADDR_TIMING) & 0x0FC00000; 282 timing |= strobe_prog & 0x00000FFF; 283 timing |= (relax << 12) & 0x0000F000; 284 timing |= (strobe_read << 16) & 0x003F0000; 285 286 writel(timing, priv->base + IMX_OCOTP_ADDR_TIMING); 287 } 288 289 static void imx_ocotp_set_imx7_timing(struct ocotp_priv *priv) 290 { 291 unsigned long clk_rate; 292 u64 fsource, strobe_prog; 293 u32 timing; 294 295 /* i.MX 7Solo Applications Processor Reference Manual, Rev. 0.1 296 * 6.4.3.3 297 */ 298 clk_rate = clk_get_rate(priv->clk); 299 fsource = DIV_ROUND_UP_ULL((u64)clk_rate * DEF_FSOURCE, 300 NSEC_PER_SEC) + 1; 301 strobe_prog = DIV_ROUND_CLOSEST_ULL((u64)clk_rate * DEF_STROBE_PROG, 302 NSEC_PER_SEC) + 1; 303 304 timing = strobe_prog & 0x00000FFF; 305 timing |= (fsource << 12) & 0x000FF000; 306 307 writel(timing, priv->base + IMX_OCOTP_ADDR_TIMING); 308 } 309 310 static int imx_ocotp_write(void *context, unsigned int offset, void *val, 311 size_t bytes) 312 { 313 struct ocotp_priv *priv = context; 314 u32 *buf = val; 315 int ret; 316 317 u32 ctrl; 318 u8 waddr; 319 u8 word = 0; 320 321 /* allow only writing one complete OTP word at a time */ 322 if ((bytes != priv->config->word_size) || 323 (offset % priv->config->word_size)) 324 return -EINVAL; 325 326 mutex_lock(&ocotp_mutex); 327 328 ret = clk_prepare_enable(priv->clk); 329 if (ret < 0) { 330 mutex_unlock(&ocotp_mutex); 331 dev_err(priv->dev, "failed to prepare/enable ocotp clk\n"); 332 return ret; 333 } 334 335 /* Setup the write timing values */ 336 priv->params->set_timing(priv); 337 338 /* 47.3.1.3.2 339 * Check that HW_OCOTP_CTRL[BUSY] and HW_OCOTP_CTRL[ERROR] are clear. 340 * Overlapped accesses are not supported by the controller. Any pending 341 * write or reload must be completed before a write access can be 342 * requested. 343 */ 344 ret = imx_ocotp_wait_for_busy(priv, 0); 345 if (ret < 0) { 346 dev_err(priv->dev, "timeout during timing setup\n"); 347 goto write_end; 348 } 349 350 /* 47.3.1.3.3 351 * Write the requested address to HW_OCOTP_CTRL[ADDR] and program the 352 * unlock code into HW_OCOTP_CTRL[WR_UNLOCK]. This must be programmed 353 * for each write access. The lock code is documented in the register 354 * description. Both the unlock code and address can be written in the 355 * same operation. 356 */ 357 if (priv->params->bank_address_words != 0) { 358 /* 359 * In banked/i.MX7 mode the OTP register bank goes into waddr 360 * see i.MX 7Solo Applications Processor Reference Manual, Rev. 361 * 0.1 section 6.4.3.1 362 */ 363 offset = offset / priv->config->word_size; 364 waddr = offset / priv->params->bank_address_words; 365 word = offset & (priv->params->bank_address_words - 1); 366 } else { 367 /* 368 * Non-banked i.MX6 mode. 369 * OTP write/read address specifies one of 128 word address 370 * locations 371 */ 372 waddr = offset / 4; 373 } 374 375 ctrl = readl(priv->base + IMX_OCOTP_ADDR_CTRL); 376 ctrl &= ~priv->params->ctrl.bm_addr; 377 ctrl |= waddr & priv->params->ctrl.bm_addr; 378 ctrl |= IMX_OCOTP_WR_UNLOCK; 379 380 writel(ctrl, priv->base + IMX_OCOTP_ADDR_CTRL); 381 382 /* 47.3.1.3.4 383 * Write the data to the HW_OCOTP_DATA register. This will automatically 384 * set HW_OCOTP_CTRL[BUSY] and clear HW_OCOTP_CTRL[WR_UNLOCK]. To 385 * protect programming same OTP bit twice, before program OCOTP will 386 * automatically read fuse value in OTP and use read value to mask 387 * program data. The controller will use masked program data to program 388 * a 32-bit word in the OTP per the address in HW_OCOTP_CTRL[ADDR]. Bit 389 * fields with 1's will result in that OTP bit being programmed. Bit 390 * fields with 0's will be ignored. At the same time that the write is 391 * accepted, the controller makes an internal copy of 392 * HW_OCOTP_CTRL[ADDR] which cannot be updated until the next write 393 * sequence is initiated. This copy guarantees that erroneous writes to 394 * HW_OCOTP_CTRL[ADDR] will not affect an active write operation. It 395 * should also be noted that during the programming HW_OCOTP_DATA will 396 * shift right (with zero fill). This shifting is required to program 397 * the OTP serially. During the write operation, HW_OCOTP_DATA cannot be 398 * modified. 399 * Note: on i.MX7 there are four data fields to write for banked write 400 * with the fuse blowing operation only taking place after data0 401 * has been written. This is why data0 must always be the last 402 * register written. 403 */ 404 if (priv->params->bank_address_words != 0) { 405 /* Banked/i.MX7 mode */ 406 switch (word) { 407 case 0: 408 writel(0, priv->base + IMX_OCOTP_ADDR_DATA1); 409 writel(0, priv->base + IMX_OCOTP_ADDR_DATA2); 410 writel(0, priv->base + IMX_OCOTP_ADDR_DATA3); 411 writel(*buf, priv->base + IMX_OCOTP_ADDR_DATA0); 412 break; 413 case 1: 414 writel(*buf, priv->base + IMX_OCOTP_ADDR_DATA1); 415 writel(0, priv->base + IMX_OCOTP_ADDR_DATA2); 416 writel(0, priv->base + IMX_OCOTP_ADDR_DATA3); 417 writel(0, priv->base + IMX_OCOTP_ADDR_DATA0); 418 break; 419 case 2: 420 writel(0, priv->base + IMX_OCOTP_ADDR_DATA1); 421 writel(*buf, priv->base + IMX_OCOTP_ADDR_DATA2); 422 writel(0, priv->base + IMX_OCOTP_ADDR_DATA3); 423 writel(0, priv->base + IMX_OCOTP_ADDR_DATA0); 424 break; 425 case 3: 426 writel(0, priv->base + IMX_OCOTP_ADDR_DATA1); 427 writel(0, priv->base + IMX_OCOTP_ADDR_DATA2); 428 writel(*buf, priv->base + IMX_OCOTP_ADDR_DATA3); 429 writel(0, priv->base + IMX_OCOTP_ADDR_DATA0); 430 break; 431 } 432 } else { 433 /* Non-banked i.MX6 mode */ 434 writel(*buf, priv->base + IMX_OCOTP_ADDR_DATA0); 435 } 436 437 /* 47.4.1.4.5 438 * Once complete, the controller will clear BUSY. A write request to a 439 * protected or locked region will result in no OTP access and no 440 * setting of HW_OCOTP_CTRL[BUSY]. In addition HW_OCOTP_CTRL[ERROR] will 441 * be set. It must be cleared by software before any new write access 442 * can be issued. 443 */ 444 ret = imx_ocotp_wait_for_busy(priv, 0); 445 if (ret < 0) { 446 if (ret == -EPERM) { 447 dev_err(priv->dev, "failed write to locked region"); 448 imx_ocotp_clr_err_if_set(priv); 449 } else { 450 dev_err(priv->dev, "timeout during data write\n"); 451 } 452 goto write_end; 453 } 454 455 /* 47.3.1.4 456 * Write Postamble: Due to internal electrical characteristics of the 457 * OTP during writes, all OTP operations following a write must be 458 * separated by 2 us after the clearing of HW_OCOTP_CTRL_BUSY following 459 * the write. 460 */ 461 udelay(2); 462 463 /* reload all shadow registers */ 464 writel(priv->params->ctrl.bm_rel_shadows, 465 priv->base + IMX_OCOTP_ADDR_CTRL_SET); 466 ret = imx_ocotp_wait_for_busy(priv, 467 priv->params->ctrl.bm_rel_shadows); 468 if (ret < 0) 469 dev_err(priv->dev, "timeout during shadow register reload\n"); 470 471 write_end: 472 clk_disable_unprepare(priv->clk); 473 mutex_unlock(&ocotp_mutex); 474 return ret < 0 ? ret : bytes; 475 } 476 477 static struct nvmem_config imx_ocotp_nvmem_config = { 478 .name = "imx-ocotp", 479 .read_only = false, 480 .word_size = 4, 481 .stride = 1, 482 .reg_read = imx_ocotp_read, 483 .reg_write = imx_ocotp_write, 484 }; 485 486 static const struct ocotp_params imx6q_params = { 487 .nregs = 128, 488 .bank_address_words = 0, 489 .set_timing = imx_ocotp_set_imx6_timing, 490 .ctrl = IMX_OCOTP_BM_CTRL_DEFAULT, 491 }; 492 493 static const struct ocotp_params imx6sl_params = { 494 .nregs = 64, 495 .bank_address_words = 0, 496 .set_timing = imx_ocotp_set_imx6_timing, 497 .ctrl = IMX_OCOTP_BM_CTRL_DEFAULT, 498 }; 499 500 static const struct ocotp_params imx6sll_params = { 501 .nregs = 80, 502 .bank_address_words = 0, 503 .set_timing = imx_ocotp_set_imx6_timing, 504 .ctrl = IMX_OCOTP_BM_CTRL_DEFAULT, 505 }; 506 507 static const struct ocotp_params imx6sx_params = { 508 .nregs = 128, 509 .bank_address_words = 0, 510 .set_timing = imx_ocotp_set_imx6_timing, 511 .ctrl = IMX_OCOTP_BM_CTRL_DEFAULT, 512 }; 513 514 static const struct ocotp_params imx6ul_params = { 515 .nregs = 144, 516 .bank_address_words = 0, 517 .set_timing = imx_ocotp_set_imx6_timing, 518 .ctrl = IMX_OCOTP_BM_CTRL_DEFAULT, 519 }; 520 521 static const struct ocotp_params imx6ull_params = { 522 .nregs = 80, 523 .bank_address_words = 0, 524 .set_timing = imx_ocotp_set_imx6_timing, 525 .ctrl = IMX_OCOTP_BM_CTRL_DEFAULT, 526 }; 527 528 static const struct ocotp_params imx7d_params = { 529 .nregs = 64, 530 .bank_address_words = 4, 531 .set_timing = imx_ocotp_set_imx7_timing, 532 .ctrl = IMX_OCOTP_BM_CTRL_DEFAULT, 533 }; 534 535 static const struct ocotp_params imx7ulp_params = { 536 .nregs = 256, 537 .bank_address_words = 0, 538 .ctrl = IMX_OCOTP_BM_CTRL_DEFAULT, 539 }; 540 541 static const struct ocotp_params imx8mq_params = { 542 .nregs = 256, 543 .bank_address_words = 0, 544 .set_timing = imx_ocotp_set_imx6_timing, 545 .ctrl = IMX_OCOTP_BM_CTRL_DEFAULT, 546 }; 547 548 static const struct ocotp_params imx8mm_params = { 549 .nregs = 256, 550 .bank_address_words = 0, 551 .set_timing = imx_ocotp_set_imx6_timing, 552 .ctrl = IMX_OCOTP_BM_CTRL_DEFAULT, 553 }; 554 555 static const struct ocotp_params imx8mn_params = { 556 .nregs = 256, 557 .bank_address_words = 0, 558 .set_timing = imx_ocotp_set_imx6_timing, 559 .ctrl = IMX_OCOTP_BM_CTRL_DEFAULT, 560 }; 561 562 static const struct ocotp_params imx8mp_params = { 563 .nregs = 384, 564 .bank_address_words = 0, 565 .set_timing = imx_ocotp_set_imx6_timing, 566 .ctrl = IMX_OCOTP_BM_CTRL_8MP, 567 }; 568 569 static const struct of_device_id imx_ocotp_dt_ids[] = { 570 { .compatible = "fsl,imx6q-ocotp", .data = &imx6q_params }, 571 { .compatible = "fsl,imx6sl-ocotp", .data = &imx6sl_params }, 572 { .compatible = "fsl,imx6sx-ocotp", .data = &imx6sx_params }, 573 { .compatible = "fsl,imx6ul-ocotp", .data = &imx6ul_params }, 574 { .compatible = "fsl,imx6ull-ocotp", .data = &imx6ull_params }, 575 { .compatible = "fsl,imx7d-ocotp", .data = &imx7d_params }, 576 { .compatible = "fsl,imx6sll-ocotp", .data = &imx6sll_params }, 577 { .compatible = "fsl,imx7ulp-ocotp", .data = &imx7ulp_params }, 578 { .compatible = "fsl,imx8mq-ocotp", .data = &imx8mq_params }, 579 { .compatible = "fsl,imx8mm-ocotp", .data = &imx8mm_params }, 580 { .compatible = "fsl,imx8mn-ocotp", .data = &imx8mn_params }, 581 { .compatible = "fsl,imx8mp-ocotp", .data = &imx8mp_params }, 582 { }, 583 }; 584 MODULE_DEVICE_TABLE(of, imx_ocotp_dt_ids); 585 586 static void imx_ocotp_fixup_cell_info(struct nvmem_device *nvmem, 587 struct nvmem_layout *layout, 588 struct nvmem_cell_info *cell) 589 { 590 cell->read_post_process = imx_ocotp_cell_pp; 591 } 592 593 static struct nvmem_layout imx_ocotp_layout = { 594 .fixup_cell_info = imx_ocotp_fixup_cell_info, 595 }; 596 597 static int imx_ocotp_probe(struct platform_device *pdev) 598 { 599 struct device *dev = &pdev->dev; 600 struct ocotp_priv *priv; 601 struct nvmem_device *nvmem; 602 603 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); 604 if (!priv) 605 return -ENOMEM; 606 607 priv->dev = dev; 608 609 priv->base = devm_platform_ioremap_resource(pdev, 0); 610 if (IS_ERR(priv->base)) 611 return PTR_ERR(priv->base); 612 613 priv->clk = devm_clk_get(dev, NULL); 614 if (IS_ERR(priv->clk)) 615 return PTR_ERR(priv->clk); 616 617 priv->params = of_device_get_match_data(&pdev->dev); 618 imx_ocotp_nvmem_config.add_legacy_fixed_of_cells = true; 619 imx_ocotp_nvmem_config.size = 4 * priv->params->nregs; 620 imx_ocotp_nvmem_config.dev = dev; 621 imx_ocotp_nvmem_config.priv = priv; 622 imx_ocotp_nvmem_config.layout = &imx_ocotp_layout; 623 624 priv->config = &imx_ocotp_nvmem_config; 625 626 clk_prepare_enable(priv->clk); 627 imx_ocotp_clr_err_if_set(priv); 628 clk_disable_unprepare(priv->clk); 629 630 nvmem = devm_nvmem_register(dev, &imx_ocotp_nvmem_config); 631 632 return PTR_ERR_OR_ZERO(nvmem); 633 } 634 635 static struct platform_driver imx_ocotp_driver = { 636 .probe = imx_ocotp_probe, 637 .driver = { 638 .name = "imx_ocotp", 639 .of_match_table = imx_ocotp_dt_ids, 640 }, 641 }; 642 module_platform_driver(imx_ocotp_driver); 643 644 MODULE_AUTHOR("Philipp Zabel <p.zabel@pengutronix.de>"); 645 MODULE_DESCRIPTION("i.MX6/i.MX7 OCOTP fuse box driver"); 646 MODULE_LICENSE("GPL v2"); 647