drivers/nvmem/imx-ocotp.c

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