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6#include <linux/bitfield.h>
7#include <linux/clk.h>
8#include <linux/mfd/syscon.h>
9#include <linux/module.h>
10#include <linux/of_platform.h>
11#include <linux/pinctrl/consumer.h>
12#include <linux/regmap.h>
13#include <linux/reset.h>
14
15
16#define FMC2_BCR1 0x0
17#define FMC2_BTR1 0x4
18#define FMC2_BCR(x) ((x) * 0x8 + FMC2_BCR1)
19#define FMC2_BTR(x) ((x) * 0x8 + FMC2_BTR1)
20#define FMC2_PCSCNTR 0x20
21#define FMC2_BWTR1 0x104
22#define FMC2_BWTR(x) ((x) * 0x8 + FMC2_BWTR1)
23
24
25#define FMC2_BCR1_CCLKEN BIT(20)
26#define FMC2_BCR1_FMC2EN BIT(31)
27
28
29#define FMC2_BCR_MBKEN BIT(0)
30#define FMC2_BCR_MUXEN BIT(1)
31#define FMC2_BCR_MTYP GENMASK(3, 2)
32#define FMC2_BCR_MWID GENMASK(5, 4)
33#define FMC2_BCR_FACCEN BIT(6)
34#define FMC2_BCR_BURSTEN BIT(8)
35#define FMC2_BCR_WAITPOL BIT(9)
36#define FMC2_BCR_WAITCFG BIT(11)
37#define FMC2_BCR_WREN BIT(12)
38#define FMC2_BCR_WAITEN BIT(13)
39#define FMC2_BCR_EXTMOD BIT(14)
40#define FMC2_BCR_ASYNCWAIT BIT(15)
41#define FMC2_BCR_CPSIZE GENMASK(18, 16)
42#define FMC2_BCR_CBURSTRW BIT(19)
43#define FMC2_BCR_NBLSET GENMASK(23, 22)
44
45
46#define FMC2_BXTR_ADDSET GENMASK(3, 0)
47#define FMC2_BXTR_ADDHLD GENMASK(7, 4)
48#define FMC2_BXTR_DATAST GENMASK(15, 8)
49#define FMC2_BXTR_BUSTURN GENMASK(19, 16)
50#define FMC2_BTR_CLKDIV GENMASK(23, 20)
51#define FMC2_BTR_DATLAT GENMASK(27, 24)
52#define FMC2_BXTR_ACCMOD GENMASK(29, 28)
53#define FMC2_BXTR_DATAHLD GENMASK(31, 30)
54
55
56#define FMC2_PCSCNTR_CSCOUNT GENMASK(15, 0)
57#define FMC2_PCSCNTR_CNTBEN(x) BIT((x) + 16)
58
59#define FMC2_MAX_EBI_CE 4
60#define FMC2_MAX_BANKS 5
61
62#define FMC2_BCR_CPSIZE_0 0x0
63#define FMC2_BCR_CPSIZE_128 0x1
64#define FMC2_BCR_CPSIZE_256 0x2
65#define FMC2_BCR_CPSIZE_512 0x3
66#define FMC2_BCR_CPSIZE_1024 0x4
67
68#define FMC2_BCR_MWID_8 0x0
69#define FMC2_BCR_MWID_16 0x1
70
71#define FMC2_BCR_MTYP_SRAM 0x0
72#define FMC2_BCR_MTYP_PSRAM 0x1
73#define FMC2_BCR_MTYP_NOR 0x2
74
75#define FMC2_BXTR_EXTMOD_A 0x0
76#define FMC2_BXTR_EXTMOD_B 0x1
77#define FMC2_BXTR_EXTMOD_C 0x2
78#define FMC2_BXTR_EXTMOD_D 0x3
79
80#define FMC2_BCR_NBLSET_MAX 0x3
81#define FMC2_BXTR_ADDSET_MAX 0xf
82#define FMC2_BXTR_ADDHLD_MAX 0xf
83#define FMC2_BXTR_DATAST_MAX 0xff
84#define FMC2_BXTR_BUSTURN_MAX 0xf
85#define FMC2_BXTR_DATAHLD_MAX 0x3
86#define FMC2_BTR_CLKDIV_MAX 0xf
87#define FMC2_BTR_DATLAT_MAX 0xf
88#define FMC2_PCSCNTR_CSCOUNT_MAX 0xff
89
90enum stm32_fmc2_ebi_bank {
91 FMC2_EBI1 = 0,
92 FMC2_EBI2,
93 FMC2_EBI3,
94 FMC2_EBI4,
95 FMC2_NAND
96};
97
98enum stm32_fmc2_ebi_register_type {
99 FMC2_REG_BCR = 1,
100 FMC2_REG_BTR,
101 FMC2_REG_BWTR,
102 FMC2_REG_PCSCNTR
103};
104
105enum stm32_fmc2_ebi_transaction_type {
106 FMC2_ASYNC_MODE_1_SRAM = 0,
107 FMC2_ASYNC_MODE_1_PSRAM,
108 FMC2_ASYNC_MODE_A_SRAM,
109 FMC2_ASYNC_MODE_A_PSRAM,
110 FMC2_ASYNC_MODE_2_NOR,
111 FMC2_ASYNC_MODE_B_NOR,
112 FMC2_ASYNC_MODE_C_NOR,
113 FMC2_ASYNC_MODE_D_NOR,
114 FMC2_SYNC_READ_SYNC_WRITE_PSRAM,
115 FMC2_SYNC_READ_ASYNC_WRITE_PSRAM,
116 FMC2_SYNC_READ_SYNC_WRITE_NOR,
117 FMC2_SYNC_READ_ASYNC_WRITE_NOR
118};
119
120enum stm32_fmc2_ebi_buswidth {
121 FMC2_BUSWIDTH_8 = 8,
122 FMC2_BUSWIDTH_16 = 16
123};
124
125enum stm32_fmc2_ebi_cpsize {
126 FMC2_CPSIZE_0 = 0,
127 FMC2_CPSIZE_128 = 128,
128 FMC2_CPSIZE_256 = 256,
129 FMC2_CPSIZE_512 = 512,
130 FMC2_CPSIZE_1024 = 1024
131};
132
133struct stm32_fmc2_ebi {
134 struct device *dev;
135 struct clk *clk;
136 struct regmap *regmap;
137 u8 bank_assigned;
138
139 u32 bcr[FMC2_MAX_EBI_CE];
140 u32 btr[FMC2_MAX_EBI_CE];
141 u32 bwtr[FMC2_MAX_EBI_CE];
142 u32 pcscntr;
143};
144
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161
162struct stm32_fmc2_prop {
163 const char *name;
164 bool bprop;
165 bool mprop;
166 int reg_type;
167 u32 reg_mask;
168 u32 reset_val;
169 int (*check)(struct stm32_fmc2_ebi *ebi,
170 const struct stm32_fmc2_prop *prop, int cs);
171 u32 (*calculate)(struct stm32_fmc2_ebi *ebi, int cs, u32 setup);
172 int (*set)(struct stm32_fmc2_ebi *ebi,
173 const struct stm32_fmc2_prop *prop,
174 int cs, u32 setup);
175};
176
177static int stm32_fmc2_ebi_check_mux(struct stm32_fmc2_ebi *ebi,
178 const struct stm32_fmc2_prop *prop,
179 int cs)
180{
181 u32 bcr;
182
183 regmap_read(ebi->regmap, FMC2_BCR(cs), &bcr);
184
185 if (bcr & FMC2_BCR_MTYP)
186 return 0;
187
188 return -EINVAL;
189}
190
191static int stm32_fmc2_ebi_check_waitcfg(struct stm32_fmc2_ebi *ebi,
192 const struct stm32_fmc2_prop *prop,
193 int cs)
194{
195 u32 bcr, val = FIELD_PREP(FMC2_BCR_MTYP, FMC2_BCR_MTYP_NOR);
196
197 regmap_read(ebi->regmap, FMC2_BCR(cs), &bcr);
198
199 if ((bcr & FMC2_BCR_MTYP) == val && bcr & FMC2_BCR_BURSTEN)
200 return 0;
201
202 return -EINVAL;
203}
204
205static int stm32_fmc2_ebi_check_sync_trans(struct stm32_fmc2_ebi *ebi,
206 const struct stm32_fmc2_prop *prop,
207 int cs)
208{
209 u32 bcr;
210
211 regmap_read(ebi->regmap, FMC2_BCR(cs), &bcr);
212
213 if (bcr & FMC2_BCR_BURSTEN)
214 return 0;
215
216 return -EINVAL;
217}
218
219static int stm32_fmc2_ebi_check_async_trans(struct stm32_fmc2_ebi *ebi,
220 const struct stm32_fmc2_prop *prop,
221 int cs)
222{
223 u32 bcr;
224
225 regmap_read(ebi->regmap, FMC2_BCR(cs), &bcr);
226
227 if (!(bcr & FMC2_BCR_BURSTEN) || !(bcr & FMC2_BCR_CBURSTRW))
228 return 0;
229
230 return -EINVAL;
231}
232
233static int stm32_fmc2_ebi_check_cpsize(struct stm32_fmc2_ebi *ebi,
234 const struct stm32_fmc2_prop *prop,
235 int cs)
236{
237 u32 bcr, val = FIELD_PREP(FMC2_BCR_MTYP, FMC2_BCR_MTYP_PSRAM);
238
239 regmap_read(ebi->regmap, FMC2_BCR(cs), &bcr);
240
241 if ((bcr & FMC2_BCR_MTYP) == val && bcr & FMC2_BCR_BURSTEN)
242 return 0;
243
244 return -EINVAL;
245}
246
247static int stm32_fmc2_ebi_check_address_hold(struct stm32_fmc2_ebi *ebi,
248 const struct stm32_fmc2_prop *prop,
249 int cs)
250{
251 u32 bcr, bxtr, val = FIELD_PREP(FMC2_BXTR_ACCMOD, FMC2_BXTR_EXTMOD_D);
252
253 regmap_read(ebi->regmap, FMC2_BCR(cs), &bcr);
254 if (prop->reg_type == FMC2_REG_BWTR)
255 regmap_read(ebi->regmap, FMC2_BWTR(cs), &bxtr);
256 else
257 regmap_read(ebi->regmap, FMC2_BTR(cs), &bxtr);
258
259 if ((!(bcr & FMC2_BCR_BURSTEN) || !(bcr & FMC2_BCR_CBURSTRW)) &&
260 ((bxtr & FMC2_BXTR_ACCMOD) == val || bcr & FMC2_BCR_MUXEN))
261 return 0;
262
263 return -EINVAL;
264}
265
266static int stm32_fmc2_ebi_check_clk_period(struct stm32_fmc2_ebi *ebi,
267 const struct stm32_fmc2_prop *prop,
268 int cs)
269{
270 u32 bcr, bcr1;
271
272 regmap_read(ebi->regmap, FMC2_BCR(cs), &bcr);
273 if (cs)
274 regmap_read(ebi->regmap, FMC2_BCR1, &bcr1);
275 else
276 bcr1 = bcr;
277
278 if (bcr & FMC2_BCR_BURSTEN && (!cs || !(bcr1 & FMC2_BCR1_CCLKEN)))
279 return 0;
280
281 return -EINVAL;
282}
283
284static int stm32_fmc2_ebi_check_cclk(struct stm32_fmc2_ebi *ebi,
285 const struct stm32_fmc2_prop *prop,
286 int cs)
287{
288 if (cs)
289 return -EINVAL;
290
291 return stm32_fmc2_ebi_check_sync_trans(ebi, prop, cs);
292}
293
294static u32 stm32_fmc2_ebi_ns_to_clock_cycles(struct stm32_fmc2_ebi *ebi,
295 int cs, u32 setup)
296{
297 unsigned long hclk = clk_get_rate(ebi->clk);
298 unsigned long hclkp = NSEC_PER_SEC / (hclk / 1000);
299
300 return DIV_ROUND_UP(setup * 1000, hclkp);
301}
302
303static u32 stm32_fmc2_ebi_ns_to_clk_period(struct stm32_fmc2_ebi *ebi,
304 int cs, u32 setup)
305{
306 u32 nb_clk_cycles = stm32_fmc2_ebi_ns_to_clock_cycles(ebi, cs, setup);
307 u32 bcr, btr, clk_period;
308
309 regmap_read(ebi->regmap, FMC2_BCR1, &bcr);
310 if (bcr & FMC2_BCR1_CCLKEN || !cs)
311 regmap_read(ebi->regmap, FMC2_BTR1, &btr);
312 else
313 regmap_read(ebi->regmap, FMC2_BTR(cs), &btr);
314
315 clk_period = FIELD_GET(FMC2_BTR_CLKDIV, btr) + 1;
316
317 return DIV_ROUND_UP(nb_clk_cycles, clk_period);
318}
319
320static int stm32_fmc2_ebi_get_reg(int reg_type, int cs, u32 *reg)
321{
322 switch (reg_type) {
323 case FMC2_REG_BCR:
324 *reg = FMC2_BCR(cs);
325 break;
326 case FMC2_REG_BTR:
327 *reg = FMC2_BTR(cs);
328 break;
329 case FMC2_REG_BWTR:
330 *reg = FMC2_BWTR(cs);
331 break;
332 case FMC2_REG_PCSCNTR:
333 *reg = FMC2_PCSCNTR;
334 break;
335 default:
336 return -EINVAL;
337 }
338
339 return 0;
340}
341
342static int stm32_fmc2_ebi_set_bit_field(struct stm32_fmc2_ebi *ebi,
343 const struct stm32_fmc2_prop *prop,
344 int cs, u32 setup)
345{
346 u32 reg;
347 int ret;
348
349 ret = stm32_fmc2_ebi_get_reg(prop->reg_type, cs, ®);
350 if (ret)
351 return ret;
352
353 regmap_update_bits(ebi->regmap, reg, prop->reg_mask,
354 setup ? prop->reg_mask : 0);
355
356 return 0;
357}
358
359static int stm32_fmc2_ebi_set_trans_type(struct stm32_fmc2_ebi *ebi,
360 const struct stm32_fmc2_prop *prop,
361 int cs, u32 setup)
362{
363 u32 bcr_mask, bcr = FMC2_BCR_WREN;
364 u32 btr_mask, btr = 0;
365 u32 bwtr_mask, bwtr = 0;
366
367 bwtr_mask = FMC2_BXTR_ACCMOD;
368 btr_mask = FMC2_BXTR_ACCMOD;
369 bcr_mask = FMC2_BCR_MUXEN | FMC2_BCR_MTYP | FMC2_BCR_FACCEN |
370 FMC2_BCR_WREN | FMC2_BCR_WAITEN | FMC2_BCR_BURSTEN |
371 FMC2_BCR_EXTMOD | FMC2_BCR_CBURSTRW;
372
373 switch (setup) {
374 case FMC2_ASYNC_MODE_1_SRAM:
375 bcr |= FIELD_PREP(FMC2_BCR_MTYP, FMC2_BCR_MTYP_SRAM);
376
377
378
379
380 break;
381 case FMC2_ASYNC_MODE_1_PSRAM:
382
383
384
385
386 bcr |= FIELD_PREP(FMC2_BCR_MTYP, FMC2_BCR_MTYP_PSRAM);
387 break;
388 case FMC2_ASYNC_MODE_A_SRAM:
389
390
391
392
393 bcr |= FIELD_PREP(FMC2_BCR_MTYP, FMC2_BCR_MTYP_SRAM);
394 bcr |= FMC2_BCR_EXTMOD;
395 btr |= FIELD_PREP(FMC2_BXTR_ACCMOD, FMC2_BXTR_EXTMOD_A);
396 bwtr |= FIELD_PREP(FMC2_BXTR_ACCMOD, FMC2_BXTR_EXTMOD_A);
397 break;
398 case FMC2_ASYNC_MODE_A_PSRAM:
399
400
401
402
403 bcr |= FIELD_PREP(FMC2_BCR_MTYP, FMC2_BCR_MTYP_PSRAM);
404 bcr |= FMC2_BCR_EXTMOD;
405 btr |= FIELD_PREP(FMC2_BXTR_ACCMOD, FMC2_BXTR_EXTMOD_A);
406 bwtr |= FIELD_PREP(FMC2_BXTR_ACCMOD, FMC2_BXTR_EXTMOD_A);
407 break;
408 case FMC2_ASYNC_MODE_2_NOR:
409
410
411
412
413 bcr |= FIELD_PREP(FMC2_BCR_MTYP, FMC2_BCR_MTYP_NOR);
414 bcr |= FMC2_BCR_FACCEN;
415 break;
416 case FMC2_ASYNC_MODE_B_NOR:
417
418
419
420
421 bcr |= FIELD_PREP(FMC2_BCR_MTYP, FMC2_BCR_MTYP_NOR);
422 bcr |= FMC2_BCR_FACCEN | FMC2_BCR_EXTMOD;
423 btr |= FIELD_PREP(FMC2_BXTR_ACCMOD, FMC2_BXTR_EXTMOD_B);
424 bwtr |= FIELD_PREP(FMC2_BXTR_ACCMOD, FMC2_BXTR_EXTMOD_B);
425 break;
426 case FMC2_ASYNC_MODE_C_NOR:
427
428
429
430
431 bcr |= FIELD_PREP(FMC2_BCR_MTYP, FMC2_BCR_MTYP_NOR);
432 bcr |= FMC2_BCR_FACCEN | FMC2_BCR_EXTMOD;
433 btr |= FIELD_PREP(FMC2_BXTR_ACCMOD, FMC2_BXTR_EXTMOD_C);
434 bwtr |= FIELD_PREP(FMC2_BXTR_ACCMOD, FMC2_BXTR_EXTMOD_C);
435 break;
436 case FMC2_ASYNC_MODE_D_NOR:
437
438
439
440
441 bcr |= FIELD_PREP(FMC2_BCR_MTYP, FMC2_BCR_MTYP_NOR);
442 bcr |= FMC2_BCR_FACCEN | FMC2_BCR_EXTMOD;
443 btr |= FIELD_PREP(FMC2_BXTR_ACCMOD, FMC2_BXTR_EXTMOD_D);
444 bwtr |= FIELD_PREP(FMC2_BXTR_ACCMOD, FMC2_BXTR_EXTMOD_D);
445 break;
446 case FMC2_SYNC_READ_SYNC_WRITE_PSRAM:
447
448
449
450
451 bcr |= FIELD_PREP(FMC2_BCR_MTYP, FMC2_BCR_MTYP_PSRAM);
452 bcr |= FMC2_BCR_BURSTEN | FMC2_BCR_CBURSTRW;
453 break;
454 case FMC2_SYNC_READ_ASYNC_WRITE_PSRAM:
455
456
457
458
459 bcr |= FIELD_PREP(FMC2_BCR_MTYP, FMC2_BCR_MTYP_PSRAM);
460 bcr |= FMC2_BCR_BURSTEN;
461 break;
462 case FMC2_SYNC_READ_SYNC_WRITE_NOR:
463
464
465
466
467 bcr |= FIELD_PREP(FMC2_BCR_MTYP, FMC2_BCR_MTYP_NOR);
468 bcr |= FMC2_BCR_FACCEN | FMC2_BCR_BURSTEN | FMC2_BCR_CBURSTRW;
469 break;
470 case FMC2_SYNC_READ_ASYNC_WRITE_NOR:
471
472
473
474
475 bcr |= FIELD_PREP(FMC2_BCR_MTYP, FMC2_BCR_MTYP_NOR);
476 bcr |= FMC2_BCR_FACCEN | FMC2_BCR_BURSTEN;
477 break;
478 default:
479
480 return -EINVAL;
481 }
482
483 if (bcr & FMC2_BCR_EXTMOD)
484 regmap_update_bits(ebi->regmap, FMC2_BWTR(cs),
485 bwtr_mask, bwtr);
486 regmap_update_bits(ebi->regmap, FMC2_BTR(cs), btr_mask, btr);
487 regmap_update_bits(ebi->regmap, FMC2_BCR(cs), bcr_mask, bcr);
488
489 return 0;
490}
491
492static int stm32_fmc2_ebi_set_buswidth(struct stm32_fmc2_ebi *ebi,
493 const struct stm32_fmc2_prop *prop,
494 int cs, u32 setup)
495{
496 u32 val;
497
498 switch (setup) {
499 case FMC2_BUSWIDTH_8:
500 val = FIELD_PREP(FMC2_BCR_MWID, FMC2_BCR_MWID_8);
501 break;
502 case FMC2_BUSWIDTH_16:
503 val = FIELD_PREP(FMC2_BCR_MWID, FMC2_BCR_MWID_16);
504 break;
505 default:
506
507 return -EINVAL;
508 }
509
510 regmap_update_bits(ebi->regmap, FMC2_BCR(cs), FMC2_BCR_MWID, val);
511
512 return 0;
513}
514
515static int stm32_fmc2_ebi_set_cpsize(struct stm32_fmc2_ebi *ebi,
516 const struct stm32_fmc2_prop *prop,
517 int cs, u32 setup)
518{
519 u32 val;
520
521 switch (setup) {
522 case FMC2_CPSIZE_0:
523 val = FIELD_PREP(FMC2_BCR_CPSIZE, FMC2_BCR_CPSIZE_0);
524 break;
525 case FMC2_CPSIZE_128:
526 val = FIELD_PREP(FMC2_BCR_CPSIZE, FMC2_BCR_CPSIZE_128);
527 break;
528 case FMC2_CPSIZE_256:
529 val = FIELD_PREP(FMC2_BCR_CPSIZE, FMC2_BCR_CPSIZE_256);
530 break;
531 case FMC2_CPSIZE_512:
532 val = FIELD_PREP(FMC2_BCR_CPSIZE, FMC2_BCR_CPSIZE_512);
533 break;
534 case FMC2_CPSIZE_1024:
535 val = FIELD_PREP(FMC2_BCR_CPSIZE, FMC2_BCR_CPSIZE_1024);
536 break;
537 default:
538
539 return -EINVAL;
540 }
541
542 regmap_update_bits(ebi->regmap, FMC2_BCR(cs), FMC2_BCR_CPSIZE, val);
543
544 return 0;
545}
546
547static int stm32_fmc2_ebi_set_bl_setup(struct stm32_fmc2_ebi *ebi,
548 const struct stm32_fmc2_prop *prop,
549 int cs, u32 setup)
550{
551 u32 val;
552
553 val = min_t(u32, setup, FMC2_BCR_NBLSET_MAX);
554 val = FIELD_PREP(FMC2_BCR_NBLSET, val);
555 regmap_update_bits(ebi->regmap, FMC2_BCR(cs), FMC2_BCR_NBLSET, val);
556
557 return 0;
558}
559
560static int stm32_fmc2_ebi_set_address_setup(struct stm32_fmc2_ebi *ebi,
561 const struct stm32_fmc2_prop *prop,
562 int cs, u32 setup)
563{
564 u32 bcr, bxtr, reg;
565 u32 val = FIELD_PREP(FMC2_BXTR_ACCMOD, FMC2_BXTR_EXTMOD_D);
566 int ret;
567
568 ret = stm32_fmc2_ebi_get_reg(prop->reg_type, cs, ®);
569 if (ret)
570 return ret;
571
572 regmap_read(ebi->regmap, FMC2_BCR(cs), &bcr);
573 if (prop->reg_type == FMC2_REG_BWTR)
574 regmap_read(ebi->regmap, FMC2_BWTR(cs), &bxtr);
575 else
576 regmap_read(ebi->regmap, FMC2_BTR(cs), &bxtr);
577
578 if ((bxtr & FMC2_BXTR_ACCMOD) == val || bcr & FMC2_BCR_MUXEN)
579 val = clamp_val(setup, 1, FMC2_BXTR_ADDSET_MAX);
580 else
581 val = min_t(u32, setup, FMC2_BXTR_ADDSET_MAX);
582 val = FIELD_PREP(FMC2_BXTR_ADDSET, val);
583 regmap_update_bits(ebi->regmap, reg, FMC2_BXTR_ADDSET, val);
584
585 return 0;
586}
587
588static int stm32_fmc2_ebi_set_address_hold(struct stm32_fmc2_ebi *ebi,
589 const struct stm32_fmc2_prop *prop,
590 int cs, u32 setup)
591{
592 u32 val, reg;
593 int ret;
594
595 ret = stm32_fmc2_ebi_get_reg(prop->reg_type, cs, ®);
596 if (ret)
597 return ret;
598
599 val = clamp_val(setup, 1, FMC2_BXTR_ADDHLD_MAX);
600 val = FIELD_PREP(FMC2_BXTR_ADDHLD, val);
601 regmap_update_bits(ebi->regmap, reg, FMC2_BXTR_ADDHLD, val);
602
603 return 0;
604}
605
606static int stm32_fmc2_ebi_set_data_setup(struct stm32_fmc2_ebi *ebi,
607 const struct stm32_fmc2_prop *prop,
608 int cs, u32 setup)
609{
610 u32 val, reg;
611 int ret;
612
613 ret = stm32_fmc2_ebi_get_reg(prop->reg_type, cs, ®);
614 if (ret)
615 return ret;
616
617 val = clamp_val(setup, 1, FMC2_BXTR_DATAST_MAX);
618 val = FIELD_PREP(FMC2_BXTR_DATAST, val);
619 regmap_update_bits(ebi->regmap, reg, FMC2_BXTR_DATAST, val);
620
621 return 0;
622}
623
624static int stm32_fmc2_ebi_set_bus_turnaround(struct stm32_fmc2_ebi *ebi,
625 const struct stm32_fmc2_prop *prop,
626 int cs, u32 setup)
627{
628 u32 val, reg;
629 int ret;
630
631 ret = stm32_fmc2_ebi_get_reg(prop->reg_type, cs, ®);
632 if (ret)
633 return ret;
634
635 val = setup ? min_t(u32, setup - 1, FMC2_BXTR_BUSTURN_MAX) : 0;
636 val = FIELD_PREP(FMC2_BXTR_BUSTURN, val);
637 regmap_update_bits(ebi->regmap, reg, FMC2_BXTR_BUSTURN, val);
638
639 return 0;
640}
641
642static int stm32_fmc2_ebi_set_data_hold(struct stm32_fmc2_ebi *ebi,
643 const struct stm32_fmc2_prop *prop,
644 int cs, u32 setup)
645{
646 u32 val, reg;
647 int ret;
648
649 ret = stm32_fmc2_ebi_get_reg(prop->reg_type, cs, ®);
650 if (ret)
651 return ret;
652
653 if (prop->reg_type == FMC2_REG_BWTR)
654 val = setup ? min_t(u32, setup - 1, FMC2_BXTR_DATAHLD_MAX) : 0;
655 else
656 val = min_t(u32, setup, FMC2_BXTR_DATAHLD_MAX);
657 val = FIELD_PREP(FMC2_BXTR_DATAHLD, val);
658 regmap_update_bits(ebi->regmap, reg, FMC2_BXTR_DATAHLD, val);
659
660 return 0;
661}
662
663static int stm32_fmc2_ebi_set_clk_period(struct stm32_fmc2_ebi *ebi,
664 const struct stm32_fmc2_prop *prop,
665 int cs, u32 setup)
666{
667 u32 val;
668
669 val = setup ? clamp_val(setup - 1, 1, FMC2_BTR_CLKDIV_MAX) : 1;
670 val = FIELD_PREP(FMC2_BTR_CLKDIV, val);
671 regmap_update_bits(ebi->regmap, FMC2_BTR(cs), FMC2_BTR_CLKDIV, val);
672
673 return 0;
674}
675
676static int stm32_fmc2_ebi_set_data_latency(struct stm32_fmc2_ebi *ebi,
677 const struct stm32_fmc2_prop *prop,
678 int cs, u32 setup)
679{
680 u32 val;
681
682 val = setup > 1 ? min_t(u32, setup - 2, FMC2_BTR_DATLAT_MAX) : 0;
683 val = FIELD_PREP(FMC2_BTR_DATLAT, val);
684 regmap_update_bits(ebi->regmap, FMC2_BTR(cs), FMC2_BTR_DATLAT, val);
685
686 return 0;
687}
688
689static int stm32_fmc2_ebi_set_max_low_pulse(struct stm32_fmc2_ebi *ebi,
690 const struct stm32_fmc2_prop *prop,
691 int cs, u32 setup)
692{
693 u32 old_val, new_val, pcscntr;
694
695 if (setup < 1)
696 return 0;
697
698 regmap_read(ebi->regmap, FMC2_PCSCNTR, &pcscntr);
699
700
701 regmap_update_bits(ebi->regmap, FMC2_PCSCNTR,
702 FMC2_PCSCNTR_CNTBEN(cs),
703 FMC2_PCSCNTR_CNTBEN(cs));
704
705 new_val = min_t(u32, setup - 1, FMC2_PCSCNTR_CSCOUNT_MAX);
706 old_val = FIELD_GET(FMC2_PCSCNTR_CSCOUNT, pcscntr);
707 if (old_val && new_val > old_val)
708
709 return 0;
710
711 new_val = FIELD_PREP(FMC2_PCSCNTR_CSCOUNT, new_val);
712 regmap_update_bits(ebi->regmap, FMC2_PCSCNTR,
713 FMC2_PCSCNTR_CSCOUNT, new_val);
714
715 return 0;
716}
717
718static const struct stm32_fmc2_prop stm32_fmc2_child_props[] = {
719
720 {
721 .name = "st,fmc2-ebi-cs-transaction-type",
722 .mprop = true,
723 .set = stm32_fmc2_ebi_set_trans_type,
724 },
725 {
726 .name = "st,fmc2-ebi-cs-cclk-enable",
727 .bprop = true,
728 .reg_type = FMC2_REG_BCR,
729 .reg_mask = FMC2_BCR1_CCLKEN,
730 .check = stm32_fmc2_ebi_check_cclk,
731 .set = stm32_fmc2_ebi_set_bit_field,
732 },
733 {
734 .name = "st,fmc2-ebi-cs-mux-enable",
735 .bprop = true,
736 .reg_type = FMC2_REG_BCR,
737 .reg_mask = FMC2_BCR_MUXEN,
738 .check = stm32_fmc2_ebi_check_mux,
739 .set = stm32_fmc2_ebi_set_bit_field,
740 },
741 {
742 .name = "st,fmc2-ebi-cs-buswidth",
743 .reset_val = FMC2_BUSWIDTH_16,
744 .set = stm32_fmc2_ebi_set_buswidth,
745 },
746 {
747 .name = "st,fmc2-ebi-cs-waitpol-high",
748 .bprop = true,
749 .reg_type = FMC2_REG_BCR,
750 .reg_mask = FMC2_BCR_WAITPOL,
751 .set = stm32_fmc2_ebi_set_bit_field,
752 },
753 {
754 .name = "st,fmc2-ebi-cs-waitcfg-enable",
755 .bprop = true,
756 .reg_type = FMC2_REG_BCR,
757 .reg_mask = FMC2_BCR_WAITCFG,
758 .check = stm32_fmc2_ebi_check_waitcfg,
759 .set = stm32_fmc2_ebi_set_bit_field,
760 },
761 {
762 .name = "st,fmc2-ebi-cs-wait-enable",
763 .bprop = true,
764 .reg_type = FMC2_REG_BCR,
765 .reg_mask = FMC2_BCR_WAITEN,
766 .check = stm32_fmc2_ebi_check_sync_trans,
767 .set = stm32_fmc2_ebi_set_bit_field,
768 },
769 {
770 .name = "st,fmc2-ebi-cs-asyncwait-enable",
771 .bprop = true,
772 .reg_type = FMC2_REG_BCR,
773 .reg_mask = FMC2_BCR_ASYNCWAIT,
774 .check = stm32_fmc2_ebi_check_async_trans,
775 .set = stm32_fmc2_ebi_set_bit_field,
776 },
777 {
778 .name = "st,fmc2-ebi-cs-cpsize",
779 .check = stm32_fmc2_ebi_check_cpsize,
780 .set = stm32_fmc2_ebi_set_cpsize,
781 },
782 {
783 .name = "st,fmc2-ebi-cs-byte-lane-setup-ns",
784 .calculate = stm32_fmc2_ebi_ns_to_clock_cycles,
785 .set = stm32_fmc2_ebi_set_bl_setup,
786 },
787 {
788 .name = "st,fmc2-ebi-cs-address-setup-ns",
789 .reg_type = FMC2_REG_BTR,
790 .reset_val = FMC2_BXTR_ADDSET_MAX,
791 .check = stm32_fmc2_ebi_check_async_trans,
792 .calculate = stm32_fmc2_ebi_ns_to_clock_cycles,
793 .set = stm32_fmc2_ebi_set_address_setup,
794 },
795 {
796 .name = "st,fmc2-ebi-cs-address-hold-ns",
797 .reg_type = FMC2_REG_BTR,
798 .reset_val = FMC2_BXTR_ADDHLD_MAX,
799 .check = stm32_fmc2_ebi_check_address_hold,
800 .calculate = stm32_fmc2_ebi_ns_to_clock_cycles,
801 .set = stm32_fmc2_ebi_set_address_hold,
802 },
803 {
804 .name = "st,fmc2-ebi-cs-data-setup-ns",
805 .reg_type = FMC2_REG_BTR,
806 .reset_val = FMC2_BXTR_DATAST_MAX,
807 .check = stm32_fmc2_ebi_check_async_trans,
808 .calculate = stm32_fmc2_ebi_ns_to_clock_cycles,
809 .set = stm32_fmc2_ebi_set_data_setup,
810 },
811 {
812 .name = "st,fmc2-ebi-cs-bus-turnaround-ns",
813 .reg_type = FMC2_REG_BTR,
814 .reset_val = FMC2_BXTR_BUSTURN_MAX + 1,
815 .calculate = stm32_fmc2_ebi_ns_to_clock_cycles,
816 .set = stm32_fmc2_ebi_set_bus_turnaround,
817 },
818 {
819 .name = "st,fmc2-ebi-cs-data-hold-ns",
820 .reg_type = FMC2_REG_BTR,
821 .check = stm32_fmc2_ebi_check_async_trans,
822 .calculate = stm32_fmc2_ebi_ns_to_clock_cycles,
823 .set = stm32_fmc2_ebi_set_data_hold,
824 },
825 {
826 .name = "st,fmc2-ebi-cs-clk-period-ns",
827 .reset_val = FMC2_BTR_CLKDIV_MAX + 1,
828 .check = stm32_fmc2_ebi_check_clk_period,
829 .calculate = stm32_fmc2_ebi_ns_to_clock_cycles,
830 .set = stm32_fmc2_ebi_set_clk_period,
831 },
832 {
833 .name = "st,fmc2-ebi-cs-data-latency-ns",
834 .check = stm32_fmc2_ebi_check_sync_trans,
835 .calculate = stm32_fmc2_ebi_ns_to_clk_period,
836 .set = stm32_fmc2_ebi_set_data_latency,
837 },
838 {
839 .name = "st,fmc2-ebi-cs-write-address-setup-ns",
840 .reg_type = FMC2_REG_BWTR,
841 .reset_val = FMC2_BXTR_ADDSET_MAX,
842 .check = stm32_fmc2_ebi_check_async_trans,
843 .calculate = stm32_fmc2_ebi_ns_to_clock_cycles,
844 .set = stm32_fmc2_ebi_set_address_setup,
845 },
846 {
847 .name = "st,fmc2-ebi-cs-write-address-hold-ns",
848 .reg_type = FMC2_REG_BWTR,
849 .reset_val = FMC2_BXTR_ADDHLD_MAX,
850 .check = stm32_fmc2_ebi_check_address_hold,
851 .calculate = stm32_fmc2_ebi_ns_to_clock_cycles,
852 .set = stm32_fmc2_ebi_set_address_hold,
853 },
854 {
855 .name = "st,fmc2-ebi-cs-write-data-setup-ns",
856 .reg_type = FMC2_REG_BWTR,
857 .reset_val = FMC2_BXTR_DATAST_MAX,
858 .check = stm32_fmc2_ebi_check_async_trans,
859 .calculate = stm32_fmc2_ebi_ns_to_clock_cycles,
860 .set = stm32_fmc2_ebi_set_data_setup,
861 },
862 {
863 .name = "st,fmc2-ebi-cs-write-bus-turnaround-ns",
864 .reg_type = FMC2_REG_BWTR,
865 .reset_val = FMC2_BXTR_BUSTURN_MAX + 1,
866 .calculate = stm32_fmc2_ebi_ns_to_clock_cycles,
867 .set = stm32_fmc2_ebi_set_bus_turnaround,
868 },
869 {
870 .name = "st,fmc2-ebi-cs-write-data-hold-ns",
871 .reg_type = FMC2_REG_BWTR,
872 .check = stm32_fmc2_ebi_check_async_trans,
873 .calculate = stm32_fmc2_ebi_ns_to_clock_cycles,
874 .set = stm32_fmc2_ebi_set_data_hold,
875 },
876 {
877 .name = "st,fmc2-ebi-cs-max-low-pulse-ns",
878 .calculate = stm32_fmc2_ebi_ns_to_clock_cycles,
879 .set = stm32_fmc2_ebi_set_max_low_pulse,
880 },
881};
882
883static int stm32_fmc2_ebi_parse_prop(struct stm32_fmc2_ebi *ebi,
884 struct device_node *dev_node,
885 const struct stm32_fmc2_prop *prop,
886 int cs)
887{
888 struct device *dev = ebi->dev;
889 u32 setup = 0;
890
891 if (!prop->set) {
892 dev_err(dev, "property %s is not well defined\n", prop->name);
893 return -EINVAL;
894 }
895
896 if (prop->check && prop->check(ebi, prop, cs))
897
898 return 0;
899
900 if (prop->bprop) {
901 bool bprop;
902
903 bprop = of_property_read_bool(dev_node, prop->name);
904 if (prop->mprop && !bprop) {
905 dev_err(dev, "mandatory property %s not defined in the device tree\n",
906 prop->name);
907 return -EINVAL;
908 }
909
910 if (bprop)
911 setup = 1;
912 } else {
913 u32 val;
914 int ret;
915
916 ret = of_property_read_u32(dev_node, prop->name, &val);
917 if (prop->mprop && ret) {
918 dev_err(dev, "mandatory property %s not defined in the device tree\n",
919 prop->name);
920 return ret;
921 }
922
923 if (ret)
924 setup = prop->reset_val;
925 else if (prop->calculate)
926 setup = prop->calculate(ebi, cs, val);
927 else
928 setup = val;
929 }
930
931 return prop->set(ebi, prop, cs, setup);
932}
933
934static void stm32_fmc2_ebi_enable_bank(struct stm32_fmc2_ebi *ebi, int cs)
935{
936 regmap_update_bits(ebi->regmap, FMC2_BCR(cs),
937 FMC2_BCR_MBKEN, FMC2_BCR_MBKEN);
938}
939
940static void stm32_fmc2_ebi_disable_bank(struct stm32_fmc2_ebi *ebi, int cs)
941{
942 regmap_update_bits(ebi->regmap, FMC2_BCR(cs), FMC2_BCR_MBKEN, 0);
943}
944
945static void stm32_fmc2_ebi_save_setup(struct stm32_fmc2_ebi *ebi)
946{
947 unsigned int cs;
948
949 for (cs = 0; cs < FMC2_MAX_EBI_CE; cs++) {
950 regmap_read(ebi->regmap, FMC2_BCR(cs), &ebi->bcr[cs]);
951 regmap_read(ebi->regmap, FMC2_BTR(cs), &ebi->btr[cs]);
952 regmap_read(ebi->regmap, FMC2_BWTR(cs), &ebi->bwtr[cs]);
953 }
954
955 regmap_read(ebi->regmap, FMC2_PCSCNTR, &ebi->pcscntr);
956}
957
958static void stm32_fmc2_ebi_set_setup(struct stm32_fmc2_ebi *ebi)
959{
960 unsigned int cs;
961
962 for (cs = 0; cs < FMC2_MAX_EBI_CE; cs++) {
963 regmap_write(ebi->regmap, FMC2_BCR(cs), ebi->bcr[cs]);
964 regmap_write(ebi->regmap, FMC2_BTR(cs), ebi->btr[cs]);
965 regmap_write(ebi->regmap, FMC2_BWTR(cs), ebi->bwtr[cs]);
966 }
967
968 regmap_write(ebi->regmap, FMC2_PCSCNTR, ebi->pcscntr);
969}
970
971static void stm32_fmc2_ebi_disable_banks(struct stm32_fmc2_ebi *ebi)
972{
973 unsigned int cs;
974
975 for (cs = 0; cs < FMC2_MAX_EBI_CE; cs++) {
976 if (!(ebi->bank_assigned & BIT(cs)))
977 continue;
978
979 stm32_fmc2_ebi_disable_bank(ebi, cs);
980 }
981}
982
983
984static bool stm32_fmc2_ebi_nwait_used_by_ctrls(struct stm32_fmc2_ebi *ebi)
985{
986 unsigned int cs;
987 u32 bcr;
988
989 for (cs = 0; cs < FMC2_MAX_EBI_CE; cs++) {
990 if (!(ebi->bank_assigned & BIT(cs)))
991 continue;
992
993 regmap_read(ebi->regmap, FMC2_BCR(cs), &bcr);
994 if ((bcr & FMC2_BCR_WAITEN || bcr & FMC2_BCR_ASYNCWAIT) &&
995 ebi->bank_assigned & BIT(FMC2_NAND))
996 return true;
997 }
998
999 return false;
1000}
1001
1002static void stm32_fmc2_ebi_enable(struct stm32_fmc2_ebi *ebi)
1003{
1004 regmap_update_bits(ebi->regmap, FMC2_BCR1,
1005 FMC2_BCR1_FMC2EN, FMC2_BCR1_FMC2EN);
1006}
1007
1008static void stm32_fmc2_ebi_disable(struct stm32_fmc2_ebi *ebi)
1009{
1010 regmap_update_bits(ebi->regmap, FMC2_BCR1, FMC2_BCR1_FMC2EN, 0);
1011}
1012
1013static int stm32_fmc2_ebi_setup_cs(struct stm32_fmc2_ebi *ebi,
1014 struct device_node *dev_node,
1015 u32 cs)
1016{
1017 unsigned int i;
1018 int ret;
1019
1020 stm32_fmc2_ebi_disable_bank(ebi, cs);
1021
1022 for (i = 0; i < ARRAY_SIZE(stm32_fmc2_child_props); i++) {
1023 const struct stm32_fmc2_prop *p = &stm32_fmc2_child_props[i];
1024
1025 ret = stm32_fmc2_ebi_parse_prop(ebi, dev_node, p, cs);
1026 if (ret) {
1027 dev_err(ebi->dev, "property %s could not be set: %d\n",
1028 p->name, ret);
1029 return ret;
1030 }
1031 }
1032
1033 stm32_fmc2_ebi_enable_bank(ebi, cs);
1034
1035 return 0;
1036}
1037
1038static int stm32_fmc2_ebi_parse_dt(struct stm32_fmc2_ebi *ebi)
1039{
1040 struct device *dev = ebi->dev;
1041 struct device_node *child;
1042 bool child_found = false;
1043 u32 bank;
1044 int ret;
1045
1046 for_each_available_child_of_node(dev->of_node, child) {
1047 ret = of_property_read_u32(child, "reg", &bank);
1048 if (ret) {
1049 dev_err(dev, "could not retrieve reg property: %d\n",
1050 ret);
1051 return ret;
1052 }
1053
1054 if (bank >= FMC2_MAX_BANKS) {
1055 dev_err(dev, "invalid reg value: %d\n", bank);
1056 return -EINVAL;
1057 }
1058
1059 if (ebi->bank_assigned & BIT(bank)) {
1060 dev_err(dev, "bank already assigned: %d\n", bank);
1061 return -EINVAL;
1062 }
1063
1064 if (bank < FMC2_MAX_EBI_CE) {
1065 ret = stm32_fmc2_ebi_setup_cs(ebi, child, bank);
1066 if (ret) {
1067 dev_err(dev, "setup chip select %d failed: %d\n",
1068 bank, ret);
1069 return ret;
1070 }
1071 }
1072
1073 ebi->bank_assigned |= BIT(bank);
1074 child_found = true;
1075 }
1076
1077 if (!child_found) {
1078 dev_warn(dev, "no subnodes found, disable the driver.\n");
1079 return -ENODEV;
1080 }
1081
1082 if (stm32_fmc2_ebi_nwait_used_by_ctrls(ebi)) {
1083 dev_err(dev, "NWAIT signal connected to EBI and NAND controllers\n");
1084 return -EINVAL;
1085 }
1086
1087 stm32_fmc2_ebi_enable(ebi);
1088
1089 return of_platform_populate(dev->of_node, NULL, NULL, dev);
1090}
1091
1092static int stm32_fmc2_ebi_probe(struct platform_device *pdev)
1093{
1094 struct device *dev = &pdev->dev;
1095 struct stm32_fmc2_ebi *ebi;
1096 struct reset_control *rstc;
1097 int ret;
1098
1099 ebi = devm_kzalloc(&pdev->dev, sizeof(*ebi), GFP_KERNEL);
1100 if (!ebi)
1101 return -ENOMEM;
1102
1103 ebi->dev = dev;
1104
1105 ebi->regmap = device_node_to_regmap(dev->of_node);
1106 if (IS_ERR(ebi->regmap))
1107 return PTR_ERR(ebi->regmap);
1108
1109 ebi->clk = devm_clk_get(dev, NULL);
1110 if (IS_ERR(ebi->clk))
1111 return PTR_ERR(ebi->clk);
1112
1113 rstc = devm_reset_control_get(dev, NULL);
1114 if (PTR_ERR(rstc) == -EPROBE_DEFER)
1115 return -EPROBE_DEFER;
1116
1117 ret = clk_prepare_enable(ebi->clk);
1118 if (ret)
1119 return ret;
1120
1121 if (!IS_ERR(rstc)) {
1122 reset_control_assert(rstc);
1123 reset_control_deassert(rstc);
1124 }
1125
1126 ret = stm32_fmc2_ebi_parse_dt(ebi);
1127 if (ret)
1128 goto err_release;
1129
1130 stm32_fmc2_ebi_save_setup(ebi);
1131 platform_set_drvdata(pdev, ebi);
1132
1133 return 0;
1134
1135err_release:
1136 stm32_fmc2_ebi_disable_banks(ebi);
1137 stm32_fmc2_ebi_disable(ebi);
1138 clk_disable_unprepare(ebi->clk);
1139
1140 return ret;
1141}
1142
1143static int stm32_fmc2_ebi_remove(struct platform_device *pdev)
1144{
1145 struct stm32_fmc2_ebi *ebi = platform_get_drvdata(pdev);
1146
1147 of_platform_depopulate(&pdev->dev);
1148 stm32_fmc2_ebi_disable_banks(ebi);
1149 stm32_fmc2_ebi_disable(ebi);
1150 clk_disable_unprepare(ebi->clk);
1151
1152 return 0;
1153}
1154
1155static int __maybe_unused stm32_fmc2_ebi_suspend(struct device *dev)
1156{
1157 struct stm32_fmc2_ebi *ebi = dev_get_drvdata(dev);
1158
1159 stm32_fmc2_ebi_disable(ebi);
1160 clk_disable_unprepare(ebi->clk);
1161 pinctrl_pm_select_sleep_state(dev);
1162
1163 return 0;
1164}
1165
1166static int __maybe_unused stm32_fmc2_ebi_resume(struct device *dev)
1167{
1168 struct stm32_fmc2_ebi *ebi = dev_get_drvdata(dev);
1169 int ret;
1170
1171 pinctrl_pm_select_default_state(dev);
1172
1173 ret = clk_prepare_enable(ebi->clk);
1174 if (ret)
1175 return ret;
1176
1177 stm32_fmc2_ebi_set_setup(ebi);
1178 stm32_fmc2_ebi_enable(ebi);
1179
1180 return 0;
1181}
1182
1183static SIMPLE_DEV_PM_OPS(stm32_fmc2_ebi_pm_ops, stm32_fmc2_ebi_suspend,
1184 stm32_fmc2_ebi_resume);
1185
1186static const struct of_device_id stm32_fmc2_ebi_match[] = {
1187 {.compatible = "st,stm32mp1-fmc2-ebi"},
1188 {}
1189};
1190MODULE_DEVICE_TABLE(of, stm32_fmc2_ebi_match);
1191
1192static struct platform_driver stm32_fmc2_ebi_driver = {
1193 .probe = stm32_fmc2_ebi_probe,
1194 .remove = stm32_fmc2_ebi_remove,
1195 .driver = {
1196 .name = "stm32_fmc2_ebi",
1197 .of_match_table = stm32_fmc2_ebi_match,
1198 .pm = &stm32_fmc2_ebi_pm_ops,
1199 },
1200};
1201module_platform_driver(stm32_fmc2_ebi_driver);
1202
1203MODULE_ALIAS("platform:stm32_fmc2_ebi");
1204MODULE_AUTHOR("Christophe Kerello <christophe.kerello@st.com>");
1205MODULE_DESCRIPTION("STMicroelectronics STM32 FMC2 ebi driver");
1206MODULE_LICENSE("GPL v2");
1207
