1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright (C) STMicroelectronics 2020
4 */
5
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.h>
11 #include <linux/of_platform.h>
12 #include <linux/pinctrl/consumer.h>
13 #include <linux/platform_device.h>
14 #include <linux/pm_runtime.h>
15 #include <linux/regmap.h>
16 #include <linux/reset.h>
17
18 /* FMC2 Controller Registers */
19 #define FMC2_BCR1 0x0
20 #define FMC2_BTR1 0x4
21 #define FMC2_BCR(x) ((x) * 0x8 + FMC2_BCR1)
22 #define FMC2_BTR(x) ((x) * 0x8 + FMC2_BTR1)
23 #define FMC2_PCSCNTR 0x20
24 #define FMC2_CFGR 0x20
25 #define FMC2_SR 0x84
26 #define FMC2_BWTR1 0x104
27 #define FMC2_BWTR(x) ((x) * 0x8 + FMC2_BWTR1)
28 #define FMC2_SECCFGR 0x300
29 #define FMC2_CIDCFGR0 0x30c
30 #define FMC2_CIDCFGR(x) ((x) * 0x8 + FMC2_CIDCFGR0)
31 #define FMC2_SEMCR0 0x310
32 #define FMC2_SEMCR(x) ((x) * 0x8 + FMC2_SEMCR0)
33
34 /* Register: FMC2_BCR1 */
35 #define FMC2_BCR1_CCLKEN BIT(20)
36 #define FMC2_BCR1_FMC2EN BIT(31)
37
38 /* Register: FMC2_BCRx */
39 #define FMC2_BCR_MBKEN BIT(0)
40 #define FMC2_BCR_MUXEN BIT(1)
41 #define FMC2_BCR_MTYP GENMASK(3, 2)
42 #define FMC2_BCR_MWID GENMASK(5, 4)
43 #define FMC2_BCR_FACCEN BIT(6)
44 #define FMC2_BCR_BURSTEN BIT(8)
45 #define FMC2_BCR_WAITPOL BIT(9)
46 #define FMC2_BCR_WAITCFG BIT(11)
47 #define FMC2_BCR_WREN BIT(12)
48 #define FMC2_BCR_WAITEN BIT(13)
49 #define FMC2_BCR_EXTMOD BIT(14)
50 #define FMC2_BCR_ASYNCWAIT BIT(15)
51 #define FMC2_BCR_CPSIZE GENMASK(18, 16)
52 #define FMC2_BCR_CBURSTRW BIT(19)
53 #define FMC2_BCR_CSCOUNT GENMASK(21, 20)
54 #define FMC2_BCR_NBLSET GENMASK(23, 22)
55
56 /* Register: FMC2_BTRx/FMC2_BWTRx */
57 #define FMC2_BXTR_ADDSET GENMASK(3, 0)
58 #define FMC2_BXTR_ADDHLD GENMASK(7, 4)
59 #define FMC2_BXTR_DATAST GENMASK(15, 8)
60 #define FMC2_BXTR_BUSTURN GENMASK(19, 16)
61 #define FMC2_BTR_CLKDIV GENMASK(23, 20)
62 #define FMC2_BTR_DATLAT GENMASK(27, 24)
63 #define FMC2_BXTR_ACCMOD GENMASK(29, 28)
64 #define FMC2_BXTR_DATAHLD GENMASK(31, 30)
65
66 /* Register: FMC2_PCSCNTR */
67 #define FMC2_PCSCNTR_CSCOUNT GENMASK(15, 0)
68 #define FMC2_PCSCNTR_CNTBEN(x) BIT((x) + 16)
69
70 /* Register: FMC2_CFGR */
71 #define FMC2_CFGR_CLKDIV GENMASK(19, 16)
72 #define FMC2_CFGR_CCLKEN BIT(20)
73 #define FMC2_CFGR_FMC2EN BIT(31)
74
75 /* Register: FMC2_SR */
76 #define FMC2_SR_ISOST GENMASK(1, 0)
77
78 /* Register: FMC2_CIDCFGR */
79 #define FMC2_CIDCFGR_CFEN BIT(0)
80 #define FMC2_CIDCFGR_SEMEN BIT(1)
81 #define FMC2_CIDCFGR_SCID GENMASK(6, 4)
82 #define FMC2_CIDCFGR_SEMWLC1 BIT(17)
83
84 /* Register: FMC2_SEMCR */
85 #define FMC2_SEMCR_SEM_MUTEX BIT(0)
86 #define FMC2_SEMCR_SEMCID GENMASK(6, 4)
87
88 #define FMC2_MAX_EBI_CE 4
89 #define FMC2_MAX_BANKS 5
90 #define FMC2_MAX_RESOURCES 6
91 #define FMC2_CID1 1
92
93 #define FMC2_BCR_CPSIZE_0 0x0
94 #define FMC2_BCR_CPSIZE_128 0x1
95 #define FMC2_BCR_CPSIZE_256 0x2
96 #define FMC2_BCR_CPSIZE_512 0x3
97 #define FMC2_BCR_CPSIZE_1024 0x4
98
99 #define FMC2_BCR_MWID_8 0x0
100 #define FMC2_BCR_MWID_16 0x1
101
102 #define FMC2_BCR_MTYP_SRAM 0x0
103 #define FMC2_BCR_MTYP_PSRAM 0x1
104 #define FMC2_BCR_MTYP_NOR 0x2
105
106 #define FMC2_BCR_CSCOUNT_0 0x0
107 #define FMC2_BCR_CSCOUNT_1 0x1
108 #define FMC2_BCR_CSCOUNT_64 0x2
109 #define FMC2_BCR_CSCOUNT_256 0x3
110
111 #define FMC2_BXTR_EXTMOD_A 0x0
112 #define FMC2_BXTR_EXTMOD_B 0x1
113 #define FMC2_BXTR_EXTMOD_C 0x2
114 #define FMC2_BXTR_EXTMOD_D 0x3
115
116 #define FMC2_BCR_NBLSET_MAX 0x3
117 #define FMC2_BXTR_ADDSET_MAX 0xf
118 #define FMC2_BXTR_ADDHLD_MAX 0xf
119 #define FMC2_BXTR_DATAST_MAX 0xff
120 #define FMC2_BXTR_BUSTURN_MAX 0xf
121 #define FMC2_BXTR_DATAHLD_MAX 0x3
122 #define FMC2_BTR_CLKDIV_MAX 0xf
123 #define FMC2_BTR_DATLAT_MAX 0xf
124 #define FMC2_PCSCNTR_CSCOUNT_MAX 0xff
125 #define FMC2_CFGR_CLKDIV_MAX 0xf
126
127 enum stm32_fmc2_ebi_bank {
128 FMC2_EBI1 = 0,
129 FMC2_EBI2,
130 FMC2_EBI3,
131 FMC2_EBI4,
132 FMC2_NAND
133 };
134
135 enum stm32_fmc2_ebi_register_type {
136 FMC2_REG_BCR = 1,
137 FMC2_REG_BTR,
138 FMC2_REG_BWTR,
139 FMC2_REG_PCSCNTR,
140 FMC2_REG_CFGR
141 };
142
143 enum stm32_fmc2_ebi_transaction_type {
144 FMC2_ASYNC_MODE_1_SRAM = 0,
145 FMC2_ASYNC_MODE_1_PSRAM,
146 FMC2_ASYNC_MODE_A_SRAM,
147 FMC2_ASYNC_MODE_A_PSRAM,
148 FMC2_ASYNC_MODE_2_NOR,
149 FMC2_ASYNC_MODE_B_NOR,
150 FMC2_ASYNC_MODE_C_NOR,
151 FMC2_ASYNC_MODE_D_NOR,
152 FMC2_SYNC_READ_SYNC_WRITE_PSRAM,
153 FMC2_SYNC_READ_ASYNC_WRITE_PSRAM,
154 FMC2_SYNC_READ_SYNC_WRITE_NOR,
155 FMC2_SYNC_READ_ASYNC_WRITE_NOR
156 };
157
158 enum stm32_fmc2_ebi_buswidth {
159 FMC2_BUSWIDTH_8 = 8,
160 FMC2_BUSWIDTH_16 = 16
161 };
162
163 enum stm32_fmc2_ebi_cpsize {
164 FMC2_CPSIZE_0 = 0,
165 FMC2_CPSIZE_128 = 128,
166 FMC2_CPSIZE_256 = 256,
167 FMC2_CPSIZE_512 = 512,
168 FMC2_CPSIZE_1024 = 1024
169 };
170
171 enum stm32_fmc2_ebi_cscount {
172 FMC2_CSCOUNT_0 = 0,
173 FMC2_CSCOUNT_1 = 1,
174 FMC2_CSCOUNT_64 = 64,
175 FMC2_CSCOUNT_256 = 256
176 };
177
178 struct stm32_fmc2_ebi;
179
180 struct stm32_fmc2_ebi_data {
181 const struct stm32_fmc2_prop *child_props;
182 unsigned int nb_child_props;
183 u32 fmc2_enable_reg;
184 u32 fmc2_enable_bit;
185 int (*nwait_used_by_ctrls)(struct stm32_fmc2_ebi *ebi);
186 void (*set_setup)(struct stm32_fmc2_ebi *ebi);
187 int (*save_setup)(struct stm32_fmc2_ebi *ebi);
188 int (*check_rif)(struct stm32_fmc2_ebi *ebi, u32 resource);
189 void (*put_sems)(struct stm32_fmc2_ebi *ebi);
190 void (*get_sems)(struct stm32_fmc2_ebi *ebi);
191 };
192
193 struct stm32_fmc2_ebi {
194 struct device *dev;
195 struct clk *clk;
196 struct regmap *regmap;
197 const struct stm32_fmc2_ebi_data *data;
198 u8 bank_assigned;
199 u8 sem_taken;
200 bool access_granted;
201
202 u32 bcr[FMC2_MAX_EBI_CE];
203 u32 btr[FMC2_MAX_EBI_CE];
204 u32 bwtr[FMC2_MAX_EBI_CE];
205 u32 pcscntr;
206 u32 cfgr;
207 };
208
209 /*
210 * struct stm32_fmc2_prop - STM32 FMC2 EBI property
211 * @name: the device tree binding name of the property
212 * @bprop: indicate that it is a boolean property
213 * @mprop: indicate that it is a mandatory property
214 * @reg_type: the register that have to be modified
215 * @reg_mask: the bit that have to be modified in the selected register
216 * in case of it is a boolean property
217 * @reset_val: the default value that have to be set in case the property
218 * has not been defined in the device tree
219 * @check: this callback ckecks that the property is compliant with the
220 * transaction type selected
221 * @calculate: this callback is called to calculate for exemple a timing
222 * set in nanoseconds in the device tree in clock cycles or in
223 * clock period
224 * @set: this callback applies the values in the registers
225 */
226 struct stm32_fmc2_prop {
227 const char *name;
228 bool bprop;
229 bool mprop;
230 int reg_type;
231 u32 reg_mask;
232 u32 reset_val;
233 int (*check)(struct stm32_fmc2_ebi *ebi,
234 const struct stm32_fmc2_prop *prop, int cs);
235 u32 (*calculate)(struct stm32_fmc2_ebi *ebi, int cs, u32 setup);
236 int (*set)(struct stm32_fmc2_ebi *ebi,
237 const struct stm32_fmc2_prop *prop,
238 int cs, u32 setup);
239 };
240
stm32_fmc2_ebi_check_mux(struct stm32_fmc2_ebi * ebi,const struct stm32_fmc2_prop * prop,int cs)241 static int stm32_fmc2_ebi_check_mux(struct stm32_fmc2_ebi *ebi,
242 const struct stm32_fmc2_prop *prop,
243 int cs)
244 {
245 u32 bcr;
246 int ret;
247
248 ret = regmap_read(ebi->regmap, FMC2_BCR(cs), &bcr);
249 if (ret)
250 return ret;
251
252 if (bcr & FMC2_BCR_MTYP)
253 return 0;
254
255 return -EINVAL;
256 }
257
stm32_fmc2_ebi_check_waitcfg(struct stm32_fmc2_ebi * ebi,const struct stm32_fmc2_prop * prop,int cs)258 static int stm32_fmc2_ebi_check_waitcfg(struct stm32_fmc2_ebi *ebi,
259 const struct stm32_fmc2_prop *prop,
260 int cs)
261 {
262 u32 bcr, val = FIELD_PREP(FMC2_BCR_MTYP, FMC2_BCR_MTYP_NOR);
263 int ret;
264
265 ret = regmap_read(ebi->regmap, FMC2_BCR(cs), &bcr);
266 if (ret)
267 return ret;
268
269 if ((bcr & FMC2_BCR_MTYP) == val && bcr & FMC2_BCR_BURSTEN)
270 return 0;
271
272 return -EINVAL;
273 }
274
stm32_fmc2_ebi_check_sync_trans(struct stm32_fmc2_ebi * ebi,const struct stm32_fmc2_prop * prop,int cs)275 static int stm32_fmc2_ebi_check_sync_trans(struct stm32_fmc2_ebi *ebi,
276 const struct stm32_fmc2_prop *prop,
277 int cs)
278 {
279 u32 bcr;
280 int ret;
281
282 ret = regmap_read(ebi->regmap, FMC2_BCR(cs), &bcr);
283 if (ret)
284 return ret;
285
286 if (bcr & FMC2_BCR_BURSTEN)
287 return 0;
288
289 return -EINVAL;
290 }
291
stm32_fmc2_ebi_mp25_check_cclk(struct stm32_fmc2_ebi * ebi,const struct stm32_fmc2_prop * prop,int cs)292 static int stm32_fmc2_ebi_mp25_check_cclk(struct stm32_fmc2_ebi *ebi,
293 const struct stm32_fmc2_prop *prop,
294 int cs)
295 {
296 if (!ebi->access_granted)
297 return -EACCES;
298
299 return stm32_fmc2_ebi_check_sync_trans(ebi, prop, cs);
300 }
301
stm32_fmc2_ebi_mp25_check_clk_period(struct stm32_fmc2_ebi * ebi,const struct stm32_fmc2_prop * prop,int cs)302 static int stm32_fmc2_ebi_mp25_check_clk_period(struct stm32_fmc2_ebi *ebi,
303 const struct stm32_fmc2_prop *prop,
304 int cs)
305 {
306 u32 cfgr;
307 int ret;
308
309 ret = regmap_read(ebi->regmap, FMC2_CFGR, &cfgr);
310 if (ret)
311 return ret;
312
313 if (cfgr & FMC2_CFGR_CCLKEN && !ebi->access_granted)
314 return -EACCES;
315
316 return stm32_fmc2_ebi_check_sync_trans(ebi, prop, cs);
317 }
318
stm32_fmc2_ebi_check_async_trans(struct stm32_fmc2_ebi * ebi,const struct stm32_fmc2_prop * prop,int cs)319 static int stm32_fmc2_ebi_check_async_trans(struct stm32_fmc2_ebi *ebi,
320 const struct stm32_fmc2_prop *prop,
321 int cs)
322 {
323 u32 bcr;
324 int ret;
325
326 ret = regmap_read(ebi->regmap, FMC2_BCR(cs), &bcr);
327 if (ret)
328 return ret;
329
330 if (!(bcr & FMC2_BCR_BURSTEN) || !(bcr & FMC2_BCR_CBURSTRW))
331 return 0;
332
333 return -EINVAL;
334 }
335
stm32_fmc2_ebi_check_cpsize(struct stm32_fmc2_ebi * ebi,const struct stm32_fmc2_prop * prop,int cs)336 static int stm32_fmc2_ebi_check_cpsize(struct stm32_fmc2_ebi *ebi,
337 const struct stm32_fmc2_prop *prop,
338 int cs)
339 {
340 u32 bcr, val = FIELD_PREP(FMC2_BCR_MTYP, FMC2_BCR_MTYP_PSRAM);
341 int ret;
342
343 ret = regmap_read(ebi->regmap, FMC2_BCR(cs), &bcr);
344 if (ret)
345 return ret;
346
347 if ((bcr & FMC2_BCR_MTYP) == val && bcr & FMC2_BCR_BURSTEN)
348 return 0;
349
350 return -EINVAL;
351 }
352
stm32_fmc2_ebi_check_address_hold(struct stm32_fmc2_ebi * ebi,const struct stm32_fmc2_prop * prop,int cs)353 static int stm32_fmc2_ebi_check_address_hold(struct stm32_fmc2_ebi *ebi,
354 const struct stm32_fmc2_prop *prop,
355 int cs)
356 {
357 u32 bcr, bxtr, val = FIELD_PREP(FMC2_BXTR_ACCMOD, FMC2_BXTR_EXTMOD_D);
358 int ret;
359
360 ret = regmap_read(ebi->regmap, FMC2_BCR(cs), &bcr);
361 if (ret)
362 return ret;
363
364 if (prop->reg_type == FMC2_REG_BWTR)
365 ret = regmap_read(ebi->regmap, FMC2_BWTR(cs), &bxtr);
366 else
367 ret = regmap_read(ebi->regmap, FMC2_BTR(cs), &bxtr);
368 if (ret)
369 return ret;
370
371 if ((!(bcr & FMC2_BCR_BURSTEN) || !(bcr & FMC2_BCR_CBURSTRW)) &&
372 ((bxtr & FMC2_BXTR_ACCMOD) == val || bcr & FMC2_BCR_MUXEN))
373 return 0;
374
375 return -EINVAL;
376 }
377
stm32_fmc2_ebi_check_clk_period(struct stm32_fmc2_ebi * ebi,const struct stm32_fmc2_prop * prop,int cs)378 static int stm32_fmc2_ebi_check_clk_period(struct stm32_fmc2_ebi *ebi,
379 const struct stm32_fmc2_prop *prop,
380 int cs)
381 {
382 u32 bcr, bcr1;
383 int ret;
384
385 ret = regmap_read(ebi->regmap, FMC2_BCR(cs), &bcr);
386 if (ret)
387 return ret;
388
389 if (cs) {
390 ret = regmap_read(ebi->regmap, FMC2_BCR1, &bcr1);
391 if (ret)
392 return ret;
393 } else {
394 bcr1 = bcr;
395 }
396
397 if (bcr & FMC2_BCR_BURSTEN && (!cs || !(bcr1 & FMC2_BCR1_CCLKEN)))
398 return 0;
399
400 return -EINVAL;
401 }
402
stm32_fmc2_ebi_check_cclk(struct stm32_fmc2_ebi * ebi,const struct stm32_fmc2_prop * prop,int cs)403 static int stm32_fmc2_ebi_check_cclk(struct stm32_fmc2_ebi *ebi,
404 const struct stm32_fmc2_prop *prop,
405 int cs)
406 {
407 if (cs)
408 return -EINVAL;
409
410 return stm32_fmc2_ebi_check_sync_trans(ebi, prop, cs);
411 }
412
stm32_fmc2_ebi_ns_to_clock_cycles(struct stm32_fmc2_ebi * ebi,int cs,u32 setup)413 static u32 stm32_fmc2_ebi_ns_to_clock_cycles(struct stm32_fmc2_ebi *ebi,
414 int cs, u32 setup)
415 {
416 unsigned long hclk = clk_get_rate(ebi->clk);
417 unsigned long hclkp = NSEC_PER_SEC / (hclk / 1000);
418
419 return DIV_ROUND_UP(setup * 1000, hclkp);
420 }
421
stm32_fmc2_ebi_ns_to_clk_period(struct stm32_fmc2_ebi * ebi,int cs,u32 setup)422 static u32 stm32_fmc2_ebi_ns_to_clk_period(struct stm32_fmc2_ebi *ebi,
423 int cs, u32 setup)
424 {
425 u32 nb_clk_cycles = stm32_fmc2_ebi_ns_to_clock_cycles(ebi, cs, setup);
426 u32 bcr, btr, clk_period;
427 int ret;
428
429 ret = regmap_read(ebi->regmap, FMC2_BCR1, &bcr);
430 if (ret)
431 return ret;
432
433 if (bcr & FMC2_BCR1_CCLKEN || !cs)
434 ret = regmap_read(ebi->regmap, FMC2_BTR1, &btr);
435 else
436 ret = regmap_read(ebi->regmap, FMC2_BTR(cs), &btr);
437 if (ret)
438 return ret;
439
440 clk_period = FIELD_GET(FMC2_BTR_CLKDIV, btr) + 1;
441
442 return DIV_ROUND_UP(nb_clk_cycles, clk_period);
443 }
444
stm32_fmc2_ebi_mp25_ns_to_clk_period(struct stm32_fmc2_ebi * ebi,int cs,u32 setup)445 static u32 stm32_fmc2_ebi_mp25_ns_to_clk_period(struct stm32_fmc2_ebi *ebi,
446 int cs, u32 setup)
447 {
448 u32 nb_clk_cycles = stm32_fmc2_ebi_ns_to_clock_cycles(ebi, cs, setup);
449 u32 cfgr, btr, clk_period;
450 int ret;
451
452 ret = regmap_read(ebi->regmap, FMC2_CFGR, &cfgr);
453 if (ret)
454 return ret;
455
456 if (cfgr & FMC2_CFGR_CCLKEN) {
457 clk_period = FIELD_GET(FMC2_CFGR_CLKDIV, cfgr) + 1;
458 } else {
459 ret = regmap_read(ebi->regmap, FMC2_BTR(cs), &btr);
460 if (ret)
461 return ret;
462
463 clk_period = FIELD_GET(FMC2_BTR_CLKDIV, btr) + 1;
464 }
465
466 return DIV_ROUND_UP(nb_clk_cycles, clk_period);
467 }
468
stm32_fmc2_ebi_get_reg(int reg_type,int cs,u32 * reg)469 static int stm32_fmc2_ebi_get_reg(int reg_type, int cs, u32 *reg)
470 {
471 switch (reg_type) {
472 case FMC2_REG_BCR:
473 *reg = FMC2_BCR(cs);
474 break;
475 case FMC2_REG_BTR:
476 *reg = FMC2_BTR(cs);
477 break;
478 case FMC2_REG_BWTR:
479 *reg = FMC2_BWTR(cs);
480 break;
481 case FMC2_REG_PCSCNTR:
482 *reg = FMC2_PCSCNTR;
483 break;
484 case FMC2_REG_CFGR:
485 *reg = FMC2_CFGR;
486 break;
487 default:
488 return -EINVAL;
489 }
490
491 return 0;
492 }
493
stm32_fmc2_ebi_set_bit_field(struct stm32_fmc2_ebi * ebi,const struct stm32_fmc2_prop * prop,int cs,u32 setup)494 static int stm32_fmc2_ebi_set_bit_field(struct stm32_fmc2_ebi *ebi,
495 const struct stm32_fmc2_prop *prop,
496 int cs, u32 setup)
497 {
498 u32 reg;
499 int ret;
500
501 ret = stm32_fmc2_ebi_get_reg(prop->reg_type, cs, ®);
502 if (ret)
503 return ret;
504
505 regmap_update_bits(ebi->regmap, reg, prop->reg_mask,
506 setup ? prop->reg_mask : 0);
507
508 return 0;
509 }
510
stm32_fmc2_ebi_set_trans_type(struct stm32_fmc2_ebi * ebi,const struct stm32_fmc2_prop * prop,int cs,u32 setup)511 static int stm32_fmc2_ebi_set_trans_type(struct stm32_fmc2_ebi *ebi,
512 const struct stm32_fmc2_prop *prop,
513 int cs, u32 setup)
514 {
515 u32 bcr_mask, bcr = FMC2_BCR_WREN;
516 u32 btr_mask, btr = 0;
517 u32 bwtr_mask, bwtr = 0;
518
519 bwtr_mask = FMC2_BXTR_ACCMOD;
520 btr_mask = FMC2_BXTR_ACCMOD;
521 bcr_mask = FMC2_BCR_MUXEN | FMC2_BCR_MTYP | FMC2_BCR_FACCEN |
522 FMC2_BCR_WREN | FMC2_BCR_WAITEN | FMC2_BCR_BURSTEN |
523 FMC2_BCR_EXTMOD | FMC2_BCR_CBURSTRW;
524
525 switch (setup) {
526 case FMC2_ASYNC_MODE_1_SRAM:
527 bcr |= FIELD_PREP(FMC2_BCR_MTYP, FMC2_BCR_MTYP_SRAM);
528 /*
529 * MUXEN = 0, MTYP = 0, FACCEN = 0, BURSTEN = 0, WAITEN = 0,
530 * WREN = 1, EXTMOD = 0, CBURSTRW = 0, ACCMOD = 0
531 */
532 break;
533 case FMC2_ASYNC_MODE_1_PSRAM:
534 /*
535 * MUXEN = 0, MTYP = 1, FACCEN = 0, BURSTEN = 0, WAITEN = 0,
536 * WREN = 1, EXTMOD = 0, CBURSTRW = 0, ACCMOD = 0
537 */
538 bcr |= FIELD_PREP(FMC2_BCR_MTYP, FMC2_BCR_MTYP_PSRAM);
539 break;
540 case FMC2_ASYNC_MODE_A_SRAM:
541 /*
542 * MUXEN = 0, MTYP = 0, FACCEN = 0, BURSTEN = 0, WAITEN = 0,
543 * WREN = 1, EXTMOD = 1, CBURSTRW = 0, ACCMOD = 0
544 */
545 bcr |= FIELD_PREP(FMC2_BCR_MTYP, FMC2_BCR_MTYP_SRAM);
546 bcr |= FMC2_BCR_EXTMOD;
547 btr |= FIELD_PREP(FMC2_BXTR_ACCMOD, FMC2_BXTR_EXTMOD_A);
548 bwtr |= FIELD_PREP(FMC2_BXTR_ACCMOD, FMC2_BXTR_EXTMOD_A);
549 break;
550 case FMC2_ASYNC_MODE_A_PSRAM:
551 /*
552 * MUXEN = 0, MTYP = 1, FACCEN = 0, BURSTEN = 0, WAITEN = 0,
553 * WREN = 1, EXTMOD = 1, CBURSTRW = 0, ACCMOD = 0
554 */
555 bcr |= FIELD_PREP(FMC2_BCR_MTYP, FMC2_BCR_MTYP_PSRAM);
556 bcr |= FMC2_BCR_EXTMOD;
557 btr |= FIELD_PREP(FMC2_BXTR_ACCMOD, FMC2_BXTR_EXTMOD_A);
558 bwtr |= FIELD_PREP(FMC2_BXTR_ACCMOD, FMC2_BXTR_EXTMOD_A);
559 break;
560 case FMC2_ASYNC_MODE_2_NOR:
561 /*
562 * MUXEN = 0, MTYP = 2, FACCEN = 1, BURSTEN = 0, WAITEN = 0,
563 * WREN = 1, EXTMOD = 0, CBURSTRW = 0, ACCMOD = 0
564 */
565 bcr |= FIELD_PREP(FMC2_BCR_MTYP, FMC2_BCR_MTYP_NOR);
566 bcr |= FMC2_BCR_FACCEN;
567 break;
568 case FMC2_ASYNC_MODE_B_NOR:
569 /*
570 * MUXEN = 0, MTYP = 2, FACCEN = 1, BURSTEN = 0, WAITEN = 0,
571 * WREN = 1, EXTMOD = 1, CBURSTRW = 0, ACCMOD = 1
572 */
573 bcr |= FIELD_PREP(FMC2_BCR_MTYP, FMC2_BCR_MTYP_NOR);
574 bcr |= FMC2_BCR_FACCEN | FMC2_BCR_EXTMOD;
575 btr |= FIELD_PREP(FMC2_BXTR_ACCMOD, FMC2_BXTR_EXTMOD_B);
576 bwtr |= FIELD_PREP(FMC2_BXTR_ACCMOD, FMC2_BXTR_EXTMOD_B);
577 break;
578 case FMC2_ASYNC_MODE_C_NOR:
579 /*
580 * MUXEN = 0, MTYP = 2, FACCEN = 1, BURSTEN = 0, WAITEN = 0,
581 * WREN = 1, EXTMOD = 1, CBURSTRW = 0, ACCMOD = 2
582 */
583 bcr |= FIELD_PREP(FMC2_BCR_MTYP, FMC2_BCR_MTYP_NOR);
584 bcr |= FMC2_BCR_FACCEN | FMC2_BCR_EXTMOD;
585 btr |= FIELD_PREP(FMC2_BXTR_ACCMOD, FMC2_BXTR_EXTMOD_C);
586 bwtr |= FIELD_PREP(FMC2_BXTR_ACCMOD, FMC2_BXTR_EXTMOD_C);
587 break;
588 case FMC2_ASYNC_MODE_D_NOR:
589 /*
590 * MUXEN = 0, MTYP = 2, FACCEN = 1, BURSTEN = 0, WAITEN = 0,
591 * WREN = 1, EXTMOD = 1, CBURSTRW = 0, ACCMOD = 3
592 */
593 bcr |= FIELD_PREP(FMC2_BCR_MTYP, FMC2_BCR_MTYP_NOR);
594 bcr |= FMC2_BCR_FACCEN | FMC2_BCR_EXTMOD;
595 btr |= FIELD_PREP(FMC2_BXTR_ACCMOD, FMC2_BXTR_EXTMOD_D);
596 bwtr |= FIELD_PREP(FMC2_BXTR_ACCMOD, FMC2_BXTR_EXTMOD_D);
597 break;
598 case FMC2_SYNC_READ_SYNC_WRITE_PSRAM:
599 /*
600 * MUXEN = 0, MTYP = 1, FACCEN = 0, BURSTEN = 1, WAITEN = 0,
601 * WREN = 1, EXTMOD = 0, CBURSTRW = 1, ACCMOD = 0
602 */
603 bcr |= FIELD_PREP(FMC2_BCR_MTYP, FMC2_BCR_MTYP_PSRAM);
604 bcr |= FMC2_BCR_BURSTEN | FMC2_BCR_CBURSTRW;
605 break;
606 case FMC2_SYNC_READ_ASYNC_WRITE_PSRAM:
607 /*
608 * MUXEN = 0, MTYP = 1, FACCEN = 0, BURSTEN = 1, WAITEN = 0,
609 * WREN = 1, EXTMOD = 0, CBURSTRW = 0, ACCMOD = 0
610 */
611 bcr |= FIELD_PREP(FMC2_BCR_MTYP, FMC2_BCR_MTYP_PSRAM);
612 bcr |= FMC2_BCR_BURSTEN;
613 break;
614 case FMC2_SYNC_READ_SYNC_WRITE_NOR:
615 /*
616 * MUXEN = 0, MTYP = 2, FACCEN = 1, BURSTEN = 1, WAITEN = 0,
617 * WREN = 1, EXTMOD = 0, CBURSTRW = 1, ACCMOD = 0
618 */
619 bcr |= FIELD_PREP(FMC2_BCR_MTYP, FMC2_BCR_MTYP_NOR);
620 bcr |= FMC2_BCR_FACCEN | FMC2_BCR_BURSTEN | FMC2_BCR_CBURSTRW;
621 break;
622 case FMC2_SYNC_READ_ASYNC_WRITE_NOR:
623 /*
624 * MUXEN = 0, MTYP = 2, FACCEN = 1, BURSTEN = 1, WAITEN = 0,
625 * WREN = 1, EXTMOD = 0, CBURSTRW = 0, ACCMOD = 0
626 */
627 bcr |= FIELD_PREP(FMC2_BCR_MTYP, FMC2_BCR_MTYP_NOR);
628 bcr |= FMC2_BCR_FACCEN | FMC2_BCR_BURSTEN;
629 break;
630 default:
631 /* Type of transaction not supported */
632 return -EINVAL;
633 }
634
635 if (bcr & FMC2_BCR_EXTMOD)
636 regmap_update_bits(ebi->regmap, FMC2_BWTR(cs),
637 bwtr_mask, bwtr);
638 regmap_update_bits(ebi->regmap, FMC2_BTR(cs), btr_mask, btr);
639 regmap_update_bits(ebi->regmap, FMC2_BCR(cs), bcr_mask, bcr);
640
641 return 0;
642 }
643
stm32_fmc2_ebi_set_buswidth(struct stm32_fmc2_ebi * ebi,const struct stm32_fmc2_prop * prop,int cs,u32 setup)644 static int stm32_fmc2_ebi_set_buswidth(struct stm32_fmc2_ebi *ebi,
645 const struct stm32_fmc2_prop *prop,
646 int cs, u32 setup)
647 {
648 u32 val;
649
650 switch (setup) {
651 case FMC2_BUSWIDTH_8:
652 val = FIELD_PREP(FMC2_BCR_MWID, FMC2_BCR_MWID_8);
653 break;
654 case FMC2_BUSWIDTH_16:
655 val = FIELD_PREP(FMC2_BCR_MWID, FMC2_BCR_MWID_16);
656 break;
657 default:
658 /* Buswidth not supported */
659 return -EINVAL;
660 }
661
662 regmap_update_bits(ebi->regmap, FMC2_BCR(cs), FMC2_BCR_MWID, val);
663
664 return 0;
665 }
666
stm32_fmc2_ebi_set_cpsize(struct stm32_fmc2_ebi * ebi,const struct stm32_fmc2_prop * prop,int cs,u32 setup)667 static int stm32_fmc2_ebi_set_cpsize(struct stm32_fmc2_ebi *ebi,
668 const struct stm32_fmc2_prop *prop,
669 int cs, u32 setup)
670 {
671 u32 val;
672
673 switch (setup) {
674 case FMC2_CPSIZE_0:
675 val = FIELD_PREP(FMC2_BCR_CPSIZE, FMC2_BCR_CPSIZE_0);
676 break;
677 case FMC2_CPSIZE_128:
678 val = FIELD_PREP(FMC2_BCR_CPSIZE, FMC2_BCR_CPSIZE_128);
679 break;
680 case FMC2_CPSIZE_256:
681 val = FIELD_PREP(FMC2_BCR_CPSIZE, FMC2_BCR_CPSIZE_256);
682 break;
683 case FMC2_CPSIZE_512:
684 val = FIELD_PREP(FMC2_BCR_CPSIZE, FMC2_BCR_CPSIZE_512);
685 break;
686 case FMC2_CPSIZE_1024:
687 val = FIELD_PREP(FMC2_BCR_CPSIZE, FMC2_BCR_CPSIZE_1024);
688 break;
689 default:
690 /* Cpsize not supported */
691 return -EINVAL;
692 }
693
694 regmap_update_bits(ebi->regmap, FMC2_BCR(cs), FMC2_BCR_CPSIZE, val);
695
696 return 0;
697 }
698
stm32_fmc2_ebi_set_bl_setup(struct stm32_fmc2_ebi * ebi,const struct stm32_fmc2_prop * prop,int cs,u32 setup)699 static int stm32_fmc2_ebi_set_bl_setup(struct stm32_fmc2_ebi *ebi,
700 const struct stm32_fmc2_prop *prop,
701 int cs, u32 setup)
702 {
703 u32 val;
704
705 val = min_t(u32, setup, FMC2_BCR_NBLSET_MAX);
706 val = FIELD_PREP(FMC2_BCR_NBLSET, val);
707 regmap_update_bits(ebi->regmap, FMC2_BCR(cs), FMC2_BCR_NBLSET, val);
708
709 return 0;
710 }
711
stm32_fmc2_ebi_set_address_setup(struct stm32_fmc2_ebi * ebi,const struct stm32_fmc2_prop * prop,int cs,u32 setup)712 static int stm32_fmc2_ebi_set_address_setup(struct stm32_fmc2_ebi *ebi,
713 const struct stm32_fmc2_prop *prop,
714 int cs, u32 setup)
715 {
716 u32 bcr, bxtr, reg;
717 u32 val = FIELD_PREP(FMC2_BXTR_ACCMOD, FMC2_BXTR_EXTMOD_D);
718 int ret;
719
720 ret = stm32_fmc2_ebi_get_reg(prop->reg_type, cs, ®);
721 if (ret)
722 return ret;
723
724 ret = regmap_read(ebi->regmap, FMC2_BCR(cs), &bcr);
725 if (ret)
726 return ret;
727
728 if (prop->reg_type == FMC2_REG_BWTR)
729 ret = regmap_read(ebi->regmap, FMC2_BWTR(cs), &bxtr);
730 else
731 ret = regmap_read(ebi->regmap, FMC2_BTR(cs), &bxtr);
732 if (ret)
733 return ret;
734
735 if ((bxtr & FMC2_BXTR_ACCMOD) == val || bcr & FMC2_BCR_MUXEN)
736 val = clamp_val(setup, 1, FMC2_BXTR_ADDSET_MAX);
737 else
738 val = min_t(u32, setup, FMC2_BXTR_ADDSET_MAX);
739 val = FIELD_PREP(FMC2_BXTR_ADDSET, val);
740 regmap_update_bits(ebi->regmap, reg, FMC2_BXTR_ADDSET, val);
741
742 return 0;
743 }
744
stm32_fmc2_ebi_set_address_hold(struct stm32_fmc2_ebi * ebi,const struct stm32_fmc2_prop * prop,int cs,u32 setup)745 static int stm32_fmc2_ebi_set_address_hold(struct stm32_fmc2_ebi *ebi,
746 const struct stm32_fmc2_prop *prop,
747 int cs, u32 setup)
748 {
749 u32 val, reg;
750 int ret;
751
752 ret = stm32_fmc2_ebi_get_reg(prop->reg_type, cs, ®);
753 if (ret)
754 return ret;
755
756 val = clamp_val(setup, 1, FMC2_BXTR_ADDHLD_MAX);
757 val = FIELD_PREP(FMC2_BXTR_ADDHLD, val);
758 regmap_update_bits(ebi->regmap, reg, FMC2_BXTR_ADDHLD, val);
759
760 return 0;
761 }
762
stm32_fmc2_ebi_set_data_setup(struct stm32_fmc2_ebi * ebi,const struct stm32_fmc2_prop * prop,int cs,u32 setup)763 static int stm32_fmc2_ebi_set_data_setup(struct stm32_fmc2_ebi *ebi,
764 const struct stm32_fmc2_prop *prop,
765 int cs, u32 setup)
766 {
767 u32 val, reg;
768 int ret;
769
770 ret = stm32_fmc2_ebi_get_reg(prop->reg_type, cs, ®);
771 if (ret)
772 return ret;
773
774 val = clamp_val(setup, 1, FMC2_BXTR_DATAST_MAX);
775 val = FIELD_PREP(FMC2_BXTR_DATAST, val);
776 regmap_update_bits(ebi->regmap, reg, FMC2_BXTR_DATAST, val);
777
778 return 0;
779 }
780
stm32_fmc2_ebi_set_bus_turnaround(struct stm32_fmc2_ebi * ebi,const struct stm32_fmc2_prop * prop,int cs,u32 setup)781 static int stm32_fmc2_ebi_set_bus_turnaround(struct stm32_fmc2_ebi *ebi,
782 const struct stm32_fmc2_prop *prop,
783 int cs, u32 setup)
784 {
785 u32 val, reg;
786 int ret;
787
788 ret = stm32_fmc2_ebi_get_reg(prop->reg_type, cs, ®);
789 if (ret)
790 return ret;
791
792 val = setup ? min_t(u32, setup - 1, FMC2_BXTR_BUSTURN_MAX) : 0;
793 val = FIELD_PREP(FMC2_BXTR_BUSTURN, val);
794 regmap_update_bits(ebi->regmap, reg, FMC2_BXTR_BUSTURN, val);
795
796 return 0;
797 }
798
stm32_fmc2_ebi_set_data_hold(struct stm32_fmc2_ebi * ebi,const struct stm32_fmc2_prop * prop,int cs,u32 setup)799 static int stm32_fmc2_ebi_set_data_hold(struct stm32_fmc2_ebi *ebi,
800 const struct stm32_fmc2_prop *prop,
801 int cs, u32 setup)
802 {
803 u32 val, reg;
804 int ret;
805
806 ret = stm32_fmc2_ebi_get_reg(prop->reg_type, cs, ®);
807 if (ret)
808 return ret;
809
810 if (prop->reg_type == FMC2_REG_BWTR)
811 val = setup ? min_t(u32, setup - 1, FMC2_BXTR_DATAHLD_MAX) : 0;
812 else
813 val = min_t(u32, setup, FMC2_BXTR_DATAHLD_MAX);
814 val = FIELD_PREP(FMC2_BXTR_DATAHLD, val);
815 regmap_update_bits(ebi->regmap, reg, FMC2_BXTR_DATAHLD, val);
816
817 return 0;
818 }
819
stm32_fmc2_ebi_set_clk_period(struct stm32_fmc2_ebi * ebi,const struct stm32_fmc2_prop * prop,int cs,u32 setup)820 static int stm32_fmc2_ebi_set_clk_period(struct stm32_fmc2_ebi *ebi,
821 const struct stm32_fmc2_prop *prop,
822 int cs, u32 setup)
823 {
824 u32 val;
825
826 val = setup ? clamp_val(setup - 1, 1, FMC2_BTR_CLKDIV_MAX) : 1;
827 val = FIELD_PREP(FMC2_BTR_CLKDIV, val);
828 regmap_update_bits(ebi->regmap, FMC2_BTR(cs), FMC2_BTR_CLKDIV, val);
829
830 return 0;
831 }
832
stm32_fmc2_ebi_mp25_set_clk_period(struct stm32_fmc2_ebi * ebi,const struct stm32_fmc2_prop * prop,int cs,u32 setup)833 static int stm32_fmc2_ebi_mp25_set_clk_period(struct stm32_fmc2_ebi *ebi,
834 const struct stm32_fmc2_prop *prop,
835 int cs, u32 setup)
836 {
837 u32 val, cfgr;
838 int ret;
839
840 ret = regmap_read(ebi->regmap, FMC2_CFGR, &cfgr);
841 if (ret)
842 return ret;
843
844 if (cfgr & FMC2_CFGR_CCLKEN) {
845 val = setup ? clamp_val(setup - 1, 1, FMC2_CFGR_CLKDIV_MAX) : 1;
846 val = FIELD_PREP(FMC2_CFGR_CLKDIV, val);
847 regmap_update_bits(ebi->regmap, FMC2_CFGR, FMC2_CFGR_CLKDIV, val);
848 } else {
849 val = setup ? clamp_val(setup - 1, 1, FMC2_BTR_CLKDIV_MAX) : 1;
850 val = FIELD_PREP(FMC2_BTR_CLKDIV, val);
851 regmap_update_bits(ebi->regmap, FMC2_BTR(cs), FMC2_BTR_CLKDIV, val);
852 }
853
854 return 0;
855 }
856
stm32_fmc2_ebi_set_data_latency(struct stm32_fmc2_ebi * ebi,const struct stm32_fmc2_prop * prop,int cs,u32 setup)857 static int stm32_fmc2_ebi_set_data_latency(struct stm32_fmc2_ebi *ebi,
858 const struct stm32_fmc2_prop *prop,
859 int cs, u32 setup)
860 {
861 u32 val;
862
863 val = setup > 1 ? min_t(u32, setup - 2, FMC2_BTR_DATLAT_MAX) : 0;
864 val = FIELD_PREP(FMC2_BTR_DATLAT, val);
865 regmap_update_bits(ebi->regmap, FMC2_BTR(cs), FMC2_BTR_DATLAT, val);
866
867 return 0;
868 }
869
stm32_fmc2_ebi_set_max_low_pulse(struct stm32_fmc2_ebi * ebi,const struct stm32_fmc2_prop * prop,int cs,u32 setup)870 static int stm32_fmc2_ebi_set_max_low_pulse(struct stm32_fmc2_ebi *ebi,
871 const struct stm32_fmc2_prop *prop,
872 int cs, u32 setup)
873 {
874 u32 old_val, new_val, pcscntr;
875 int ret;
876
877 if (setup < 1)
878 return 0;
879
880 ret = regmap_read(ebi->regmap, FMC2_PCSCNTR, &pcscntr);
881 if (ret)
882 return ret;
883
884 /* Enable counter for the bank */
885 regmap_update_bits(ebi->regmap, FMC2_PCSCNTR,
886 FMC2_PCSCNTR_CNTBEN(cs),
887 FMC2_PCSCNTR_CNTBEN(cs));
888
889 new_val = min_t(u32, setup - 1, FMC2_PCSCNTR_CSCOUNT_MAX);
890 old_val = FIELD_GET(FMC2_PCSCNTR_CSCOUNT, pcscntr);
891 if (old_val && new_val > old_val)
892 /* Keep current counter value */
893 return 0;
894
895 new_val = FIELD_PREP(FMC2_PCSCNTR_CSCOUNT, new_val);
896 regmap_update_bits(ebi->regmap, FMC2_PCSCNTR,
897 FMC2_PCSCNTR_CSCOUNT, new_val);
898
899 return 0;
900 }
901
stm32_fmc2_ebi_mp25_set_max_low_pulse(struct stm32_fmc2_ebi * ebi,const struct stm32_fmc2_prop * prop,int cs,u32 setup)902 static int stm32_fmc2_ebi_mp25_set_max_low_pulse(struct stm32_fmc2_ebi *ebi,
903 const struct stm32_fmc2_prop *prop,
904 int cs, u32 setup)
905 {
906 u32 val;
907
908 if (setup == FMC2_CSCOUNT_0)
909 val = FIELD_PREP(FMC2_BCR_CSCOUNT, FMC2_BCR_CSCOUNT_0);
910 else if (setup == FMC2_CSCOUNT_1)
911 val = FIELD_PREP(FMC2_BCR_CSCOUNT, FMC2_BCR_CSCOUNT_1);
912 else if (setup <= FMC2_CSCOUNT_64)
913 val = FIELD_PREP(FMC2_BCR_CSCOUNT, FMC2_BCR_CSCOUNT_64);
914 else
915 val = FIELD_PREP(FMC2_BCR_CSCOUNT, FMC2_BCR_CSCOUNT_256);
916
917 regmap_update_bits(ebi->regmap, FMC2_BCR(cs),
918 FMC2_BCR_CSCOUNT, val);
919
920 return 0;
921 }
922
923 static const struct stm32_fmc2_prop stm32_fmc2_child_props[] = {
924 /* st,fmc2-ebi-cs-trans-type must be the first property */
925 {
926 .name = "st,fmc2-ebi-cs-transaction-type",
927 .mprop = true,
928 .set = stm32_fmc2_ebi_set_trans_type,
929 },
930 {
931 .name = "st,fmc2-ebi-cs-cclk-enable",
932 .bprop = true,
933 .reg_type = FMC2_REG_BCR,
934 .reg_mask = FMC2_BCR1_CCLKEN,
935 .check = stm32_fmc2_ebi_check_cclk,
936 .set = stm32_fmc2_ebi_set_bit_field,
937 },
938 {
939 .name = "st,fmc2-ebi-cs-mux-enable",
940 .bprop = true,
941 .reg_type = FMC2_REG_BCR,
942 .reg_mask = FMC2_BCR_MUXEN,
943 .check = stm32_fmc2_ebi_check_mux,
944 .set = stm32_fmc2_ebi_set_bit_field,
945 },
946 {
947 .name = "st,fmc2-ebi-cs-buswidth",
948 .reset_val = FMC2_BUSWIDTH_16,
949 .set = stm32_fmc2_ebi_set_buswidth,
950 },
951 {
952 .name = "st,fmc2-ebi-cs-waitpol-high",
953 .bprop = true,
954 .reg_type = FMC2_REG_BCR,
955 .reg_mask = FMC2_BCR_WAITPOL,
956 .set = stm32_fmc2_ebi_set_bit_field,
957 },
958 {
959 .name = "st,fmc2-ebi-cs-waitcfg-enable",
960 .bprop = true,
961 .reg_type = FMC2_REG_BCR,
962 .reg_mask = FMC2_BCR_WAITCFG,
963 .check = stm32_fmc2_ebi_check_waitcfg,
964 .set = stm32_fmc2_ebi_set_bit_field,
965 },
966 {
967 .name = "st,fmc2-ebi-cs-wait-enable",
968 .bprop = true,
969 .reg_type = FMC2_REG_BCR,
970 .reg_mask = FMC2_BCR_WAITEN,
971 .check = stm32_fmc2_ebi_check_sync_trans,
972 .set = stm32_fmc2_ebi_set_bit_field,
973 },
974 {
975 .name = "st,fmc2-ebi-cs-asyncwait-enable",
976 .bprop = true,
977 .reg_type = FMC2_REG_BCR,
978 .reg_mask = FMC2_BCR_ASYNCWAIT,
979 .check = stm32_fmc2_ebi_check_async_trans,
980 .set = stm32_fmc2_ebi_set_bit_field,
981 },
982 {
983 .name = "st,fmc2-ebi-cs-cpsize",
984 .check = stm32_fmc2_ebi_check_cpsize,
985 .set = stm32_fmc2_ebi_set_cpsize,
986 },
987 {
988 .name = "st,fmc2-ebi-cs-byte-lane-setup-ns",
989 .calculate = stm32_fmc2_ebi_ns_to_clock_cycles,
990 .set = stm32_fmc2_ebi_set_bl_setup,
991 },
992 {
993 .name = "st,fmc2-ebi-cs-address-setup-ns",
994 .reg_type = FMC2_REG_BTR,
995 .reset_val = FMC2_BXTR_ADDSET_MAX,
996 .check = stm32_fmc2_ebi_check_async_trans,
997 .calculate = stm32_fmc2_ebi_ns_to_clock_cycles,
998 .set = stm32_fmc2_ebi_set_address_setup,
999 },
1000 {
1001 .name = "st,fmc2-ebi-cs-address-hold-ns",
1002 .reg_type = FMC2_REG_BTR,
1003 .reset_val = FMC2_BXTR_ADDHLD_MAX,
1004 .check = stm32_fmc2_ebi_check_address_hold,
1005 .calculate = stm32_fmc2_ebi_ns_to_clock_cycles,
1006 .set = stm32_fmc2_ebi_set_address_hold,
1007 },
1008 {
1009 .name = "st,fmc2-ebi-cs-data-setup-ns",
1010 .reg_type = FMC2_REG_BTR,
1011 .reset_val = FMC2_BXTR_DATAST_MAX,
1012 .check = stm32_fmc2_ebi_check_async_trans,
1013 .calculate = stm32_fmc2_ebi_ns_to_clock_cycles,
1014 .set = stm32_fmc2_ebi_set_data_setup,
1015 },
1016 {
1017 .name = "st,fmc2-ebi-cs-bus-turnaround-ns",
1018 .reg_type = FMC2_REG_BTR,
1019 .reset_val = FMC2_BXTR_BUSTURN_MAX + 1,
1020 .calculate = stm32_fmc2_ebi_ns_to_clock_cycles,
1021 .set = stm32_fmc2_ebi_set_bus_turnaround,
1022 },
1023 {
1024 .name = "st,fmc2-ebi-cs-data-hold-ns",
1025 .reg_type = FMC2_REG_BTR,
1026 .check = stm32_fmc2_ebi_check_async_trans,
1027 .calculate = stm32_fmc2_ebi_ns_to_clock_cycles,
1028 .set = stm32_fmc2_ebi_set_data_hold,
1029 },
1030 {
1031 .name = "st,fmc2-ebi-cs-clk-period-ns",
1032 .reset_val = FMC2_BTR_CLKDIV_MAX + 1,
1033 .check = stm32_fmc2_ebi_check_clk_period,
1034 .calculate = stm32_fmc2_ebi_ns_to_clock_cycles,
1035 .set = stm32_fmc2_ebi_set_clk_period,
1036 },
1037 {
1038 .name = "st,fmc2-ebi-cs-data-latency-ns",
1039 .check = stm32_fmc2_ebi_check_sync_trans,
1040 .calculate = stm32_fmc2_ebi_ns_to_clk_period,
1041 .set = stm32_fmc2_ebi_set_data_latency,
1042 },
1043 {
1044 .name = "st,fmc2-ebi-cs-write-address-setup-ns",
1045 .reg_type = FMC2_REG_BWTR,
1046 .reset_val = FMC2_BXTR_ADDSET_MAX,
1047 .check = stm32_fmc2_ebi_check_async_trans,
1048 .calculate = stm32_fmc2_ebi_ns_to_clock_cycles,
1049 .set = stm32_fmc2_ebi_set_address_setup,
1050 },
1051 {
1052 .name = "st,fmc2-ebi-cs-write-address-hold-ns",
1053 .reg_type = FMC2_REG_BWTR,
1054 .reset_val = FMC2_BXTR_ADDHLD_MAX,
1055 .check = stm32_fmc2_ebi_check_address_hold,
1056 .calculate = stm32_fmc2_ebi_ns_to_clock_cycles,
1057 .set = stm32_fmc2_ebi_set_address_hold,
1058 },
1059 {
1060 .name = "st,fmc2-ebi-cs-write-data-setup-ns",
1061 .reg_type = FMC2_REG_BWTR,
1062 .reset_val = FMC2_BXTR_DATAST_MAX,
1063 .check = stm32_fmc2_ebi_check_async_trans,
1064 .calculate = stm32_fmc2_ebi_ns_to_clock_cycles,
1065 .set = stm32_fmc2_ebi_set_data_setup,
1066 },
1067 {
1068 .name = "st,fmc2-ebi-cs-write-bus-turnaround-ns",
1069 .reg_type = FMC2_REG_BWTR,
1070 .reset_val = FMC2_BXTR_BUSTURN_MAX + 1,
1071 .calculate = stm32_fmc2_ebi_ns_to_clock_cycles,
1072 .set = stm32_fmc2_ebi_set_bus_turnaround,
1073 },
1074 {
1075 .name = "st,fmc2-ebi-cs-write-data-hold-ns",
1076 .reg_type = FMC2_REG_BWTR,
1077 .check = stm32_fmc2_ebi_check_async_trans,
1078 .calculate = stm32_fmc2_ebi_ns_to_clock_cycles,
1079 .set = stm32_fmc2_ebi_set_data_hold,
1080 },
1081 {
1082 .name = "st,fmc2-ebi-cs-max-low-pulse-ns",
1083 .calculate = stm32_fmc2_ebi_ns_to_clock_cycles,
1084 .set = stm32_fmc2_ebi_set_max_low_pulse,
1085 },
1086 };
1087
1088 static const struct stm32_fmc2_prop stm32_fmc2_mp25_child_props[] = {
1089 /* st,fmc2-ebi-cs-trans-type must be the first property */
1090 {
1091 .name = "st,fmc2-ebi-cs-transaction-type",
1092 .mprop = true,
1093 .set = stm32_fmc2_ebi_set_trans_type,
1094 },
1095 {
1096 .name = "st,fmc2-ebi-cs-cclk-enable",
1097 .bprop = true,
1098 .reg_type = FMC2_REG_CFGR,
1099 .reg_mask = FMC2_CFGR_CCLKEN,
1100 .check = stm32_fmc2_ebi_mp25_check_cclk,
1101 .set = stm32_fmc2_ebi_set_bit_field,
1102 },
1103 {
1104 .name = "st,fmc2-ebi-cs-mux-enable",
1105 .bprop = true,
1106 .reg_type = FMC2_REG_BCR,
1107 .reg_mask = FMC2_BCR_MUXEN,
1108 .check = stm32_fmc2_ebi_check_mux,
1109 .set = stm32_fmc2_ebi_set_bit_field,
1110 },
1111 {
1112 .name = "st,fmc2-ebi-cs-buswidth",
1113 .reset_val = FMC2_BUSWIDTH_16,
1114 .set = stm32_fmc2_ebi_set_buswidth,
1115 },
1116 {
1117 .name = "st,fmc2-ebi-cs-waitpol-high",
1118 .bprop = true,
1119 .reg_type = FMC2_REG_BCR,
1120 .reg_mask = FMC2_BCR_WAITPOL,
1121 .set = stm32_fmc2_ebi_set_bit_field,
1122 },
1123 {
1124 .name = "st,fmc2-ebi-cs-waitcfg-enable",
1125 .bprop = true,
1126 .reg_type = FMC2_REG_BCR,
1127 .reg_mask = FMC2_BCR_WAITCFG,
1128 .check = stm32_fmc2_ebi_check_waitcfg,
1129 .set = stm32_fmc2_ebi_set_bit_field,
1130 },
1131 {
1132 .name = "st,fmc2-ebi-cs-wait-enable",
1133 .bprop = true,
1134 .reg_type = FMC2_REG_BCR,
1135 .reg_mask = FMC2_BCR_WAITEN,
1136 .check = stm32_fmc2_ebi_check_sync_trans,
1137 .set = stm32_fmc2_ebi_set_bit_field,
1138 },
1139 {
1140 .name = "st,fmc2-ebi-cs-asyncwait-enable",
1141 .bprop = true,
1142 .reg_type = FMC2_REG_BCR,
1143 .reg_mask = FMC2_BCR_ASYNCWAIT,
1144 .check = stm32_fmc2_ebi_check_async_trans,
1145 .set = stm32_fmc2_ebi_set_bit_field,
1146 },
1147 {
1148 .name = "st,fmc2-ebi-cs-cpsize",
1149 .check = stm32_fmc2_ebi_check_cpsize,
1150 .set = stm32_fmc2_ebi_set_cpsize,
1151 },
1152 {
1153 .name = "st,fmc2-ebi-cs-byte-lane-setup-ns",
1154 .calculate = stm32_fmc2_ebi_ns_to_clock_cycles,
1155 .set = stm32_fmc2_ebi_set_bl_setup,
1156 },
1157 {
1158 .name = "st,fmc2-ebi-cs-address-setup-ns",
1159 .reg_type = FMC2_REG_BTR,
1160 .reset_val = FMC2_BXTR_ADDSET_MAX,
1161 .check = stm32_fmc2_ebi_check_async_trans,
1162 .calculate = stm32_fmc2_ebi_ns_to_clock_cycles,
1163 .set = stm32_fmc2_ebi_set_address_setup,
1164 },
1165 {
1166 .name = "st,fmc2-ebi-cs-address-hold-ns",
1167 .reg_type = FMC2_REG_BTR,
1168 .reset_val = FMC2_BXTR_ADDHLD_MAX,
1169 .check = stm32_fmc2_ebi_check_address_hold,
1170 .calculate = stm32_fmc2_ebi_ns_to_clock_cycles,
1171 .set = stm32_fmc2_ebi_set_address_hold,
1172 },
1173 {
1174 .name = "st,fmc2-ebi-cs-data-setup-ns",
1175 .reg_type = FMC2_REG_BTR,
1176 .reset_val = FMC2_BXTR_DATAST_MAX,
1177 .check = stm32_fmc2_ebi_check_async_trans,
1178 .calculate = stm32_fmc2_ebi_ns_to_clock_cycles,
1179 .set = stm32_fmc2_ebi_set_data_setup,
1180 },
1181 {
1182 .name = "st,fmc2-ebi-cs-bus-turnaround-ns",
1183 .reg_type = FMC2_REG_BTR,
1184 .reset_val = FMC2_BXTR_BUSTURN_MAX + 1,
1185 .calculate = stm32_fmc2_ebi_ns_to_clock_cycles,
1186 .set = stm32_fmc2_ebi_set_bus_turnaround,
1187 },
1188 {
1189 .name = "st,fmc2-ebi-cs-data-hold-ns",
1190 .reg_type = FMC2_REG_BTR,
1191 .check = stm32_fmc2_ebi_check_async_trans,
1192 .calculate = stm32_fmc2_ebi_ns_to_clock_cycles,
1193 .set = stm32_fmc2_ebi_set_data_hold,
1194 },
1195 {
1196 .name = "st,fmc2-ebi-cs-clk-period-ns",
1197 .reset_val = FMC2_CFGR_CLKDIV_MAX + 1,
1198 .check = stm32_fmc2_ebi_mp25_check_clk_period,
1199 .calculate = stm32_fmc2_ebi_ns_to_clock_cycles,
1200 .set = stm32_fmc2_ebi_mp25_set_clk_period,
1201 },
1202 {
1203 .name = "st,fmc2-ebi-cs-data-latency-ns",
1204 .check = stm32_fmc2_ebi_check_sync_trans,
1205 .calculate = stm32_fmc2_ebi_mp25_ns_to_clk_period,
1206 .set = stm32_fmc2_ebi_set_data_latency,
1207 },
1208 {
1209 .name = "st,fmc2-ebi-cs-write-address-setup-ns",
1210 .reg_type = FMC2_REG_BWTR,
1211 .reset_val = FMC2_BXTR_ADDSET_MAX,
1212 .check = stm32_fmc2_ebi_check_async_trans,
1213 .calculate = stm32_fmc2_ebi_ns_to_clock_cycles,
1214 .set = stm32_fmc2_ebi_set_address_setup,
1215 },
1216 {
1217 .name = "st,fmc2-ebi-cs-write-address-hold-ns",
1218 .reg_type = FMC2_REG_BWTR,
1219 .reset_val = FMC2_BXTR_ADDHLD_MAX,
1220 .check = stm32_fmc2_ebi_check_address_hold,
1221 .calculate = stm32_fmc2_ebi_ns_to_clock_cycles,
1222 .set = stm32_fmc2_ebi_set_address_hold,
1223 },
1224 {
1225 .name = "st,fmc2-ebi-cs-write-data-setup-ns",
1226 .reg_type = FMC2_REG_BWTR,
1227 .reset_val = FMC2_BXTR_DATAST_MAX,
1228 .check = stm32_fmc2_ebi_check_async_trans,
1229 .calculate = stm32_fmc2_ebi_ns_to_clock_cycles,
1230 .set = stm32_fmc2_ebi_set_data_setup,
1231 },
1232 {
1233 .name = "st,fmc2-ebi-cs-write-bus-turnaround-ns",
1234 .reg_type = FMC2_REG_BWTR,
1235 .reset_val = FMC2_BXTR_BUSTURN_MAX + 1,
1236 .calculate = stm32_fmc2_ebi_ns_to_clock_cycles,
1237 .set = stm32_fmc2_ebi_set_bus_turnaround,
1238 },
1239 {
1240 .name = "st,fmc2-ebi-cs-write-data-hold-ns",
1241 .reg_type = FMC2_REG_BWTR,
1242 .check = stm32_fmc2_ebi_check_async_trans,
1243 .calculate = stm32_fmc2_ebi_ns_to_clock_cycles,
1244 .set = stm32_fmc2_ebi_set_data_hold,
1245 },
1246 {
1247 .name = "st,fmc2-ebi-cs-max-low-pulse-ns",
1248 .calculate = stm32_fmc2_ebi_ns_to_clock_cycles,
1249 .set = stm32_fmc2_ebi_mp25_set_max_low_pulse,
1250 },
1251 };
1252
stm32_fmc2_ebi_mp25_check_rif(struct stm32_fmc2_ebi * ebi,u32 resource)1253 static int stm32_fmc2_ebi_mp25_check_rif(struct stm32_fmc2_ebi *ebi, u32 resource)
1254 {
1255 u32 seccfgr, cidcfgr, semcr;
1256 int cid, ret;
1257
1258 if (resource >= FMC2_MAX_RESOURCES)
1259 return -EINVAL;
1260
1261 ret = regmap_read(ebi->regmap, FMC2_SECCFGR, &seccfgr);
1262 if (ret)
1263 return ret;
1264
1265 if (seccfgr & BIT(resource)) {
1266 if (resource)
1267 dev_err(ebi->dev, "resource %d is configured as secure\n",
1268 resource);
1269
1270 return -EACCES;
1271 }
1272
1273 ret = regmap_read(ebi->regmap, FMC2_CIDCFGR(resource), &cidcfgr);
1274 if (ret)
1275 return ret;
1276
1277 if (!(cidcfgr & FMC2_CIDCFGR_CFEN))
1278 /* CID filtering is turned off: access granted */
1279 return 0;
1280
1281 if (!(cidcfgr & FMC2_CIDCFGR_SEMEN)) {
1282 /* Static CID mode */
1283 cid = FIELD_GET(FMC2_CIDCFGR_SCID, cidcfgr);
1284 if (cid != FMC2_CID1) {
1285 if (resource)
1286 dev_err(ebi->dev, "static CID%d set for resource %d\n",
1287 cid, resource);
1288
1289 return -EACCES;
1290 }
1291
1292 return 0;
1293 }
1294
1295 /* Pass-list with semaphore mode */
1296 if (!(cidcfgr & FMC2_CIDCFGR_SEMWLC1)) {
1297 if (resource)
1298 dev_err(ebi->dev, "CID1 is block-listed for resource %d\n",
1299 resource);
1300
1301 return -EACCES;
1302 }
1303
1304 ret = regmap_read(ebi->regmap, FMC2_SEMCR(resource), &semcr);
1305 if (ret)
1306 return ret;
1307
1308 if (!(semcr & FMC2_SEMCR_SEM_MUTEX)) {
1309 regmap_update_bits(ebi->regmap, FMC2_SEMCR(resource),
1310 FMC2_SEMCR_SEM_MUTEX, FMC2_SEMCR_SEM_MUTEX);
1311
1312 ret = regmap_read(ebi->regmap, FMC2_SEMCR(resource), &semcr);
1313 if (ret)
1314 return ret;
1315 }
1316
1317 cid = FIELD_GET(FMC2_SEMCR_SEMCID, semcr);
1318 if (cid != FMC2_CID1) {
1319 if (resource)
1320 dev_err(ebi->dev, "resource %d is already used by CID%d\n",
1321 resource, cid);
1322
1323 return -EACCES;
1324 }
1325
1326 ebi->sem_taken |= BIT(resource);
1327
1328 return 0;
1329 }
1330
stm32_fmc2_ebi_mp25_put_sems(struct stm32_fmc2_ebi * ebi)1331 static void stm32_fmc2_ebi_mp25_put_sems(struct stm32_fmc2_ebi *ebi)
1332 {
1333 unsigned int resource;
1334
1335 for (resource = 0; resource < FMC2_MAX_RESOURCES; resource++) {
1336 if (!(ebi->sem_taken & BIT(resource)))
1337 continue;
1338
1339 regmap_update_bits(ebi->regmap, FMC2_SEMCR(resource),
1340 FMC2_SEMCR_SEM_MUTEX, 0);
1341 }
1342 }
1343
stm32_fmc2_ebi_mp25_get_sems(struct stm32_fmc2_ebi * ebi)1344 static void stm32_fmc2_ebi_mp25_get_sems(struct stm32_fmc2_ebi *ebi)
1345 {
1346 unsigned int resource;
1347
1348 for (resource = 0; resource < FMC2_MAX_RESOURCES; resource++) {
1349 if (!(ebi->sem_taken & BIT(resource)))
1350 continue;
1351
1352 regmap_update_bits(ebi->regmap, FMC2_SEMCR(resource),
1353 FMC2_SEMCR_SEM_MUTEX, FMC2_SEMCR_SEM_MUTEX);
1354 }
1355 }
1356
stm32_fmc2_ebi_parse_prop(struct stm32_fmc2_ebi * ebi,struct device_node * dev_node,const struct stm32_fmc2_prop * prop,int cs)1357 static int stm32_fmc2_ebi_parse_prop(struct stm32_fmc2_ebi *ebi,
1358 struct device_node *dev_node,
1359 const struct stm32_fmc2_prop *prop,
1360 int cs)
1361 {
1362 struct device *dev = ebi->dev;
1363 u32 setup = 0;
1364
1365 if (!prop->set) {
1366 dev_err(dev, "property %s is not well defined\n", prop->name);
1367 return -EINVAL;
1368 }
1369
1370 if (prop->check && prop->check(ebi, prop, cs))
1371 /* Skeep this property */
1372 return 0;
1373
1374 if (prop->bprop) {
1375 bool bprop;
1376
1377 bprop = of_property_read_bool(dev_node, prop->name);
1378 if (prop->mprop && !bprop) {
1379 dev_err(dev, "mandatory property %s not defined in the device tree\n",
1380 prop->name);
1381 return -EINVAL;
1382 }
1383
1384 if (bprop)
1385 setup = 1;
1386 } else {
1387 u32 val;
1388 int ret;
1389
1390 ret = of_property_read_u32(dev_node, prop->name, &val);
1391 if (prop->mprop && ret) {
1392 dev_err(dev, "mandatory property %s not defined in the device tree\n",
1393 prop->name);
1394 return ret;
1395 }
1396
1397 if (ret)
1398 setup = prop->reset_val;
1399 else if (prop->calculate)
1400 setup = prop->calculate(ebi, cs, val);
1401 else
1402 setup = val;
1403 }
1404
1405 return prop->set(ebi, prop, cs, setup);
1406 }
1407
stm32_fmc2_ebi_enable_bank(struct stm32_fmc2_ebi * ebi,int cs)1408 static void stm32_fmc2_ebi_enable_bank(struct stm32_fmc2_ebi *ebi, int cs)
1409 {
1410 regmap_update_bits(ebi->regmap, FMC2_BCR(cs),
1411 FMC2_BCR_MBKEN, FMC2_BCR_MBKEN);
1412 }
1413
stm32_fmc2_ebi_disable_bank(struct stm32_fmc2_ebi * ebi,int cs)1414 static void stm32_fmc2_ebi_disable_bank(struct stm32_fmc2_ebi *ebi, int cs)
1415 {
1416 regmap_update_bits(ebi->regmap, FMC2_BCR(cs), FMC2_BCR_MBKEN, 0);
1417 }
1418
stm32_fmc2_ebi_save_setup(struct stm32_fmc2_ebi * ebi)1419 static int stm32_fmc2_ebi_save_setup(struct stm32_fmc2_ebi *ebi)
1420 {
1421 unsigned int cs;
1422 int ret;
1423
1424 for (cs = 0; cs < FMC2_MAX_EBI_CE; cs++) {
1425 if (!(ebi->bank_assigned & BIT(cs)))
1426 continue;
1427
1428 ret = regmap_read(ebi->regmap, FMC2_BCR(cs), &ebi->bcr[cs]);
1429 ret |= regmap_read(ebi->regmap, FMC2_BTR(cs), &ebi->btr[cs]);
1430 ret |= regmap_read(ebi->regmap, FMC2_BWTR(cs), &ebi->bwtr[cs]);
1431 if (ret)
1432 return ret;
1433 }
1434
1435 return 0;
1436 }
1437
stm32_fmc2_ebi_mp1_save_setup(struct stm32_fmc2_ebi * ebi)1438 static int stm32_fmc2_ebi_mp1_save_setup(struct stm32_fmc2_ebi *ebi)
1439 {
1440 int ret;
1441
1442 ret = stm32_fmc2_ebi_save_setup(ebi);
1443 if (ret)
1444 return ret;
1445
1446 return regmap_read(ebi->regmap, FMC2_PCSCNTR, &ebi->pcscntr);
1447 }
1448
stm32_fmc2_ebi_mp25_save_setup(struct stm32_fmc2_ebi * ebi)1449 static int stm32_fmc2_ebi_mp25_save_setup(struct stm32_fmc2_ebi *ebi)
1450 {
1451 int ret;
1452
1453 ret = stm32_fmc2_ebi_save_setup(ebi);
1454 if (ret)
1455 return ret;
1456
1457 if (ebi->access_granted)
1458 ret = regmap_read(ebi->regmap, FMC2_CFGR, &ebi->cfgr);
1459
1460 return ret;
1461 }
1462
stm32_fmc2_ebi_set_setup(struct stm32_fmc2_ebi * ebi)1463 static void stm32_fmc2_ebi_set_setup(struct stm32_fmc2_ebi *ebi)
1464 {
1465 unsigned int cs;
1466
1467 for (cs = 0; cs < FMC2_MAX_EBI_CE; cs++) {
1468 if (!(ebi->bank_assigned & BIT(cs)))
1469 continue;
1470
1471 regmap_write(ebi->regmap, FMC2_BCR(cs), ebi->bcr[cs]);
1472 regmap_write(ebi->regmap, FMC2_BTR(cs), ebi->btr[cs]);
1473 regmap_write(ebi->regmap, FMC2_BWTR(cs), ebi->bwtr[cs]);
1474 }
1475 }
1476
stm32_fmc2_ebi_mp1_set_setup(struct stm32_fmc2_ebi * ebi)1477 static void stm32_fmc2_ebi_mp1_set_setup(struct stm32_fmc2_ebi *ebi)
1478 {
1479 stm32_fmc2_ebi_set_setup(ebi);
1480 regmap_write(ebi->regmap, FMC2_PCSCNTR, ebi->pcscntr);
1481 }
1482
stm32_fmc2_ebi_mp25_set_setup(struct stm32_fmc2_ebi * ebi)1483 static void stm32_fmc2_ebi_mp25_set_setup(struct stm32_fmc2_ebi *ebi)
1484 {
1485 stm32_fmc2_ebi_set_setup(ebi);
1486
1487 if (ebi->access_granted)
1488 regmap_write(ebi->regmap, FMC2_CFGR, ebi->cfgr);
1489 }
1490
stm32_fmc2_ebi_disable_banks(struct stm32_fmc2_ebi * ebi)1491 static void stm32_fmc2_ebi_disable_banks(struct stm32_fmc2_ebi *ebi)
1492 {
1493 unsigned int cs;
1494
1495 for (cs = 0; cs < FMC2_MAX_EBI_CE; cs++) {
1496 if (!(ebi->bank_assigned & BIT(cs)))
1497 continue;
1498
1499 stm32_fmc2_ebi_disable_bank(ebi, cs);
1500 }
1501 }
1502
1503 /* NWAIT signal can not be connected to EBI controller and NAND controller */
stm32_fmc2_ebi_nwait_used_by_ctrls(struct stm32_fmc2_ebi * ebi)1504 static int stm32_fmc2_ebi_nwait_used_by_ctrls(struct stm32_fmc2_ebi *ebi)
1505 {
1506 struct device *dev = ebi->dev;
1507 unsigned int cs;
1508 u32 bcr;
1509 int ret;
1510
1511 for (cs = 0; cs < FMC2_MAX_EBI_CE; cs++) {
1512 if (!(ebi->bank_assigned & BIT(cs)))
1513 continue;
1514
1515 ret = regmap_read(ebi->regmap, FMC2_BCR(cs), &bcr);
1516 if (ret)
1517 return ret;
1518
1519 if ((bcr & FMC2_BCR_WAITEN || bcr & FMC2_BCR_ASYNCWAIT) &&
1520 ebi->bank_assigned & BIT(FMC2_NAND)) {
1521 dev_err(dev, "NWAIT signal connected to EBI and NAND controllers\n");
1522 return -EINVAL;
1523 }
1524 }
1525
1526 return 0;
1527 }
1528
stm32_fmc2_ebi_enable(struct stm32_fmc2_ebi * ebi)1529 static void stm32_fmc2_ebi_enable(struct stm32_fmc2_ebi *ebi)
1530 {
1531 if (!ebi->access_granted)
1532 return;
1533
1534 regmap_update_bits(ebi->regmap, ebi->data->fmc2_enable_reg,
1535 ebi->data->fmc2_enable_bit,
1536 ebi->data->fmc2_enable_bit);
1537 }
1538
stm32_fmc2_ebi_disable(struct stm32_fmc2_ebi * ebi)1539 static void stm32_fmc2_ebi_disable(struct stm32_fmc2_ebi *ebi)
1540 {
1541 if (!ebi->access_granted)
1542 return;
1543
1544 regmap_update_bits(ebi->regmap, ebi->data->fmc2_enable_reg,
1545 ebi->data->fmc2_enable_bit, 0);
1546 }
1547
stm32_fmc2_ebi_setup_cs(struct stm32_fmc2_ebi * ebi,struct device_node * dev_node,u32 cs)1548 static int stm32_fmc2_ebi_setup_cs(struct stm32_fmc2_ebi *ebi,
1549 struct device_node *dev_node,
1550 u32 cs)
1551 {
1552 unsigned int i;
1553 int ret;
1554
1555 stm32_fmc2_ebi_disable_bank(ebi, cs);
1556
1557 for (i = 0; i < ebi->data->nb_child_props; i++) {
1558 const struct stm32_fmc2_prop *p = &ebi->data->child_props[i];
1559
1560 ret = stm32_fmc2_ebi_parse_prop(ebi, dev_node, p, cs);
1561 if (ret) {
1562 dev_err(ebi->dev, "property %s could not be set: %d\n",
1563 p->name, ret);
1564 return ret;
1565 }
1566 }
1567
1568 stm32_fmc2_ebi_enable_bank(ebi, cs);
1569
1570 return 0;
1571 }
1572
stm32_fmc2_ebi_parse_dt(struct stm32_fmc2_ebi * ebi)1573 static int stm32_fmc2_ebi_parse_dt(struct stm32_fmc2_ebi *ebi)
1574 {
1575 struct device *dev = ebi->dev;
1576 bool child_found = false;
1577 u32 bank;
1578 int ret;
1579
1580 for_each_available_child_of_node_scoped(dev->of_node, child) {
1581 ret = of_property_read_u32(child, "reg", &bank);
1582 if (ret)
1583 return dev_err_probe(dev, ret, "could not retrieve reg property\n");
1584
1585 if (bank >= FMC2_MAX_BANKS) {
1586 dev_err(dev, "invalid reg value: %d\n", bank);
1587 return -EINVAL;
1588 }
1589
1590 if (ebi->bank_assigned & BIT(bank)) {
1591 dev_err(dev, "bank already assigned: %d\n", bank);
1592 return -EINVAL;
1593 }
1594
1595 if (ebi->data->check_rif) {
1596 ret = ebi->data->check_rif(ebi, bank + 1);
1597 if (ret) {
1598 dev_err(dev, "bank access failed: %d\n", bank);
1599 return ret;
1600 }
1601 }
1602
1603 if (bank < FMC2_MAX_EBI_CE) {
1604 ret = stm32_fmc2_ebi_setup_cs(ebi, child, bank);
1605 if (ret)
1606 return dev_err_probe(dev, ret,
1607 "setup chip select %d failed\n", bank);
1608 }
1609
1610 ebi->bank_assigned |= BIT(bank);
1611 child_found = true;
1612 }
1613
1614 if (!child_found) {
1615 dev_warn(dev, "no subnodes found, disable the driver.\n");
1616 return -ENODEV;
1617 }
1618
1619 if (ebi->data->nwait_used_by_ctrls) {
1620 ret = ebi->data->nwait_used_by_ctrls(ebi);
1621 if (ret)
1622 return ret;
1623 }
1624
1625 stm32_fmc2_ebi_enable(ebi);
1626
1627 return of_platform_populate(dev->of_node, NULL, NULL, dev);
1628 }
1629
stm32_fmc2_ebi_probe(struct platform_device * pdev)1630 static int stm32_fmc2_ebi_probe(struct platform_device *pdev)
1631 {
1632 struct device *dev = &pdev->dev;
1633 struct stm32_fmc2_ebi *ebi;
1634 struct reset_control *rstc;
1635 int ret;
1636
1637 ebi = devm_kzalloc(&pdev->dev, sizeof(*ebi), GFP_KERNEL);
1638 if (!ebi)
1639 return -ENOMEM;
1640
1641 ebi->dev = dev;
1642 platform_set_drvdata(pdev, ebi);
1643
1644 ebi->data = of_device_get_match_data(dev);
1645 if (!ebi->data)
1646 return -EINVAL;
1647
1648 ebi->regmap = device_node_to_regmap(dev->of_node);
1649 if (IS_ERR(ebi->regmap))
1650 return PTR_ERR(ebi->regmap);
1651
1652 ebi->clk = devm_clk_get(dev, NULL);
1653 if (IS_ERR(ebi->clk))
1654 return PTR_ERR(ebi->clk);
1655
1656 rstc = devm_reset_control_get(dev, NULL);
1657 if (PTR_ERR(rstc) == -EPROBE_DEFER)
1658 return -EPROBE_DEFER;
1659
1660 ret = devm_pm_runtime_enable(dev);
1661 if (ret)
1662 return ret;
1663
1664 ret = pm_runtime_resume_and_get(dev);
1665 if (ret < 0)
1666 return ret;
1667
1668 if (!IS_ERR(rstc)) {
1669 reset_control_assert(rstc);
1670 reset_control_deassert(rstc);
1671 }
1672
1673 /* Check if CFGR register can be modified */
1674 ebi->access_granted = true;
1675 if (ebi->data->check_rif) {
1676 ret = ebi->data->check_rif(ebi, 0);
1677 if (ret) {
1678 u32 sr;
1679
1680 ebi->access_granted = false;
1681
1682 ret = regmap_read(ebi->regmap, FMC2_SR, &sr);
1683 if (ret)
1684 goto err_release;
1685
1686 /* In case of CFGR is secure, just check that the FMC2 is enabled */
1687 if (sr & FMC2_SR_ISOST) {
1688 dev_err(dev, "FMC2 is not ready to be used.\n");
1689 ret = -EACCES;
1690 goto err_release;
1691 }
1692 }
1693 }
1694
1695 ret = stm32_fmc2_ebi_parse_dt(ebi);
1696 if (ret)
1697 goto err_release;
1698
1699 ret = ebi->data->save_setup(ebi);
1700 if (ret)
1701 goto err_release;
1702
1703 return 0;
1704
1705 err_release:
1706 stm32_fmc2_ebi_disable_banks(ebi);
1707 stm32_fmc2_ebi_disable(ebi);
1708 if (ebi->data->put_sems)
1709 ebi->data->put_sems(ebi);
1710 pm_runtime_put_sync_suspend(dev);
1711
1712 return ret;
1713 }
1714
stm32_fmc2_ebi_remove(struct platform_device * pdev)1715 static void stm32_fmc2_ebi_remove(struct platform_device *pdev)
1716 {
1717 struct stm32_fmc2_ebi *ebi = platform_get_drvdata(pdev);
1718
1719 of_platform_depopulate(&pdev->dev);
1720 stm32_fmc2_ebi_disable_banks(ebi);
1721 stm32_fmc2_ebi_disable(ebi);
1722 if (ebi->data->put_sems)
1723 ebi->data->put_sems(ebi);
1724 pm_runtime_put_sync_suspend(&pdev->dev);
1725 }
1726
stm32_fmc2_ebi_runtime_suspend(struct device * dev)1727 static int __maybe_unused stm32_fmc2_ebi_runtime_suspend(struct device *dev)
1728 {
1729 struct stm32_fmc2_ebi *ebi = dev_get_drvdata(dev);
1730
1731 clk_disable_unprepare(ebi->clk);
1732
1733 return 0;
1734 }
1735
stm32_fmc2_ebi_runtime_resume(struct device * dev)1736 static int __maybe_unused stm32_fmc2_ebi_runtime_resume(struct device *dev)
1737 {
1738 struct stm32_fmc2_ebi *ebi = dev_get_drvdata(dev);
1739
1740 return clk_prepare_enable(ebi->clk);
1741 }
1742
stm32_fmc2_ebi_suspend(struct device * dev)1743 static int __maybe_unused stm32_fmc2_ebi_suspend(struct device *dev)
1744 {
1745 struct stm32_fmc2_ebi *ebi = dev_get_drvdata(dev);
1746
1747 stm32_fmc2_ebi_disable(ebi);
1748 if (ebi->data->put_sems)
1749 ebi->data->put_sems(ebi);
1750 pm_runtime_put_sync_suspend(dev);
1751 pinctrl_pm_select_sleep_state(dev);
1752
1753 return 0;
1754 }
1755
stm32_fmc2_ebi_resume(struct device * dev)1756 static int __maybe_unused stm32_fmc2_ebi_resume(struct device *dev)
1757 {
1758 struct stm32_fmc2_ebi *ebi = dev_get_drvdata(dev);
1759 int ret;
1760
1761 pinctrl_pm_select_default_state(dev);
1762
1763 ret = pm_runtime_resume_and_get(dev);
1764 if (ret < 0)
1765 return ret;
1766
1767 if (ebi->data->get_sems)
1768 ebi->data->get_sems(ebi);
1769 ebi->data->set_setup(ebi);
1770 stm32_fmc2_ebi_enable(ebi);
1771
1772 return 0;
1773 }
1774
1775 static const struct dev_pm_ops stm32_fmc2_ebi_pm_ops = {
1776 SET_RUNTIME_PM_OPS(stm32_fmc2_ebi_runtime_suspend,
1777 stm32_fmc2_ebi_runtime_resume, NULL)
1778 SET_SYSTEM_SLEEP_PM_OPS(stm32_fmc2_ebi_suspend, stm32_fmc2_ebi_resume)
1779 };
1780
1781 static const struct stm32_fmc2_ebi_data stm32_fmc2_ebi_mp1_data = {
1782 .child_props = stm32_fmc2_child_props,
1783 .nb_child_props = ARRAY_SIZE(stm32_fmc2_child_props),
1784 .fmc2_enable_reg = FMC2_BCR1,
1785 .fmc2_enable_bit = FMC2_BCR1_FMC2EN,
1786 .nwait_used_by_ctrls = stm32_fmc2_ebi_nwait_used_by_ctrls,
1787 .set_setup = stm32_fmc2_ebi_mp1_set_setup,
1788 .save_setup = stm32_fmc2_ebi_mp1_save_setup,
1789 };
1790
1791 static const struct stm32_fmc2_ebi_data stm32_fmc2_ebi_mp25_data = {
1792 .child_props = stm32_fmc2_mp25_child_props,
1793 .nb_child_props = ARRAY_SIZE(stm32_fmc2_mp25_child_props),
1794 .fmc2_enable_reg = FMC2_CFGR,
1795 .fmc2_enable_bit = FMC2_CFGR_FMC2EN,
1796 .set_setup = stm32_fmc2_ebi_mp25_set_setup,
1797 .save_setup = stm32_fmc2_ebi_mp25_save_setup,
1798 .check_rif = stm32_fmc2_ebi_mp25_check_rif,
1799 .put_sems = stm32_fmc2_ebi_mp25_put_sems,
1800 .get_sems = stm32_fmc2_ebi_mp25_get_sems,
1801 };
1802
1803 static const struct of_device_id stm32_fmc2_ebi_match[] = {
1804 {
1805 .compatible = "st,stm32mp1-fmc2-ebi",
1806 .data = &stm32_fmc2_ebi_mp1_data,
1807 },
1808 {
1809 .compatible = "st,stm32mp25-fmc2-ebi",
1810 .data = &stm32_fmc2_ebi_mp25_data,
1811 },
1812 {}
1813 };
1814 MODULE_DEVICE_TABLE(of, stm32_fmc2_ebi_match);
1815
1816 static struct platform_driver stm32_fmc2_ebi_driver = {
1817 .probe = stm32_fmc2_ebi_probe,
1818 .remove_new = stm32_fmc2_ebi_remove,
1819 .driver = {
1820 .name = "stm32_fmc2_ebi",
1821 .of_match_table = stm32_fmc2_ebi_match,
1822 .pm = &stm32_fmc2_ebi_pm_ops,
1823 },
1824 };
1825 module_platform_driver(stm32_fmc2_ebi_driver);
1826
1827 MODULE_ALIAS("platform:stm32_fmc2_ebi");
1828 MODULE_AUTHOR("Christophe Kerello <christophe.kerello@st.com>");
1829 MODULE_DESCRIPTION("STMicroelectronics STM32 FMC2 ebi driver");
1830 MODULE_LICENSE("GPL v2");
1831