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
77static DEFINE_MUTEX(ocotp_mutex);
78
79struct 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
87struct ocotp_ctrl_reg {
88 u32 bm_addr;
89 u32 bm_busy;
90 u32 bm_error;
91 u32 bm_rel_shadows;
92};
93
94struct 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
101static 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(addr: 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
143static 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(addr: base + IMX_OCOTP_ADDR_CTRL);
151 if (!(c & bm_ctrl_error))
152 return;
153
154 writel(val: bm_ctrl_error, addr: base + IMX_OCOTP_ADDR_CTRL_CLR);
155}
156
157static 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(size: 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(clk: priv->clk);
182 if (ret < 0) {
183 mutex_unlock(lock: &ocotp_mutex);
184 dev_err(priv->dev, "failed to prepare/enable ocotp clk\n");
185 kfree(objp: p);
186 return ret;
187 }
188
189 ret = imx_ocotp_wait_for_busy(priv, flags: 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(addr: 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
214read_end:
215 clk_disable_unprepare(clk: priv->clk);
216 mutex_unlock(lock: &ocotp_mutex);
217
218 kfree(objp: p);
219
220 return ret;
221}
222
223static 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
237static 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(clk: 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(addr: 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(val: timing, addr: priv->base + IMX_OCOTP_ADDR_TIMING);
287}
288
289static 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(clk: 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(val: timing, addr: priv->base + IMX_OCOTP_ADDR_TIMING);
308}
309
310static 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(clk: priv->clk);
329 if (ret < 0) {
330 mutex_unlock(lock: &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, flags: 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(addr: 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(val: ctrl, addr: 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(val: 0, addr: priv->base + IMX_OCOTP_ADDR_DATA1);
409 writel(val: 0, addr: priv->base + IMX_OCOTP_ADDR_DATA2);
410 writel(val: 0, addr: priv->base + IMX_OCOTP_ADDR_DATA3);
411 writel(val: *buf, addr: priv->base + IMX_OCOTP_ADDR_DATA0);
412 break;
413 case 1:
414 writel(val: *buf, addr: priv->base + IMX_OCOTP_ADDR_DATA1);
415 writel(val: 0, addr: priv->base + IMX_OCOTP_ADDR_DATA2);
416 writel(val: 0, addr: priv->base + IMX_OCOTP_ADDR_DATA3);
417 writel(val: 0, addr: priv->base + IMX_OCOTP_ADDR_DATA0);
418 break;
419 case 2:
420 writel(val: 0, addr: priv->base + IMX_OCOTP_ADDR_DATA1);
421 writel(val: *buf, addr: priv->base + IMX_OCOTP_ADDR_DATA2);
422 writel(val: 0, addr: priv->base + IMX_OCOTP_ADDR_DATA3);
423 writel(val: 0, addr: priv->base + IMX_OCOTP_ADDR_DATA0);
424 break;
425 case 3:
426 writel(val: 0, addr: priv->base + IMX_OCOTP_ADDR_DATA1);
427 writel(val: 0, addr: priv->base + IMX_OCOTP_ADDR_DATA2);
428 writel(val: *buf, addr: priv->base + IMX_OCOTP_ADDR_DATA3);
429 writel(val: 0, addr: priv->base + IMX_OCOTP_ADDR_DATA0);
430 break;
431 }
432 } else {
433 /* Non-banked i.MX6 mode */
434 writel(val: *buf, addr: 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, flags: 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(val: priv->params->ctrl.bm_rel_shadows,
465 addr: priv->base + IMX_OCOTP_ADDR_CTRL_SET);
466 ret = imx_ocotp_wait_for_busy(priv,
467 flags: priv->params->ctrl.bm_rel_shadows);
468 if (ret < 0)
469 dev_err(priv->dev, "timeout during shadow register reload\n");
470
471write_end:
472 clk_disable_unprepare(clk: priv->clk);
473 mutex_unlock(lock: &ocotp_mutex);
474 return ret < 0 ? ret : bytes;
475}
476
477static 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
486static 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
493static 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
500static 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
507static 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
514static 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
521static 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
528static 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
535static const struct ocotp_params imx7ulp_params = {
536 .nregs = 256,
537 .bank_address_words = 0,
538 .ctrl = IMX_OCOTP_BM_CTRL_DEFAULT,
539};
540
541static 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
548static 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
555static 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
562static 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
569static 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};
584MODULE_DEVICE_TABLE(of, imx_ocotp_dt_ids);
585
586static 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
593static struct nvmem_layout imx_ocotp_layout = {
594 .fixup_cell_info = imx_ocotp_fixup_cell_info,
595};
596
597static 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, size: sizeof(*priv), GFP_KERNEL);
604 if (!priv)
605 return -ENOMEM;
606
607 priv->dev = dev;
608
609 priv->base = devm_platform_ioremap_resource(pdev, index: 0);
610 if (IS_ERR(ptr: priv->base))
611 return PTR_ERR(ptr: priv->base);
612
613 priv->clk = devm_clk_get(dev, NULL);
614 if (IS_ERR(ptr: priv->clk))
615 return PTR_ERR(ptr: priv->clk);
616
617 priv->params = of_device_get_match_data(dev: &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(clk: priv->clk);
627 imx_ocotp_clr_err_if_set(priv);
628 clk_disable_unprepare(clk: priv->clk);
629
630 nvmem = devm_nvmem_register(dev, cfg: &imx_ocotp_nvmem_config);
631
632 return PTR_ERR_OR_ZERO(ptr: nvmem);
633}
634
635static 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};
642module_platform_driver(imx_ocotp_driver);
643
644MODULE_AUTHOR("Philipp Zabel <p.zabel@pengutronix.de>");
645MODULE_DESCRIPTION("i.MX6/i.MX7 OCOTP fuse box driver");
646MODULE_LICENSE("GPL v2");
647

source code of linux/drivers/nvmem/imx-ocotp.c