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WIP FPC-III support
[linux/fpc-iii.git] / drivers / mtd / nand / raw / stm32_fmc2_nand.c
blob550bda4d1415a34745bde133bf32203d3cf604e9
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright (C) STMicroelectronics 2018
4 * Author: Christophe Kerello <christophe.kerello@st.com>
5 */
6
7 #include <linux/bitfield.h>
8 #include <linux/clk.h>
9 #include <linux/dmaengine.h>
10 #include <linux/dma-mapping.h>
11 #include <linux/errno.h>
12 #include <linux/interrupt.h>
13 #include <linux/iopoll.h>
14 #include <linux/mfd/syscon.h>
15 #include <linux/module.h>
16 #include <linux/mtd/rawnand.h>
17 #include <linux/of_address.h>
18 #include <linux/pinctrl/consumer.h>
19 #include <linux/platform_device.h>
20 #include <linux/regmap.h>
21 #include <linux/reset.h>
22
23 /* Bad block marker length */
24 #define FMC2_BBM_LEN 2
25
26 /* ECC step size */
27 #define FMC2_ECC_STEP_SIZE 512
28
29 /* BCHDSRx registers length */
30 #define FMC2_BCHDSRS_LEN 20
31
32 /* HECCR length */
33 #define FMC2_HECCR_LEN 4
34
35 /* Max requests done for a 8k nand page size */
36 #define FMC2_MAX_SG 16
37
38 /* Max chip enable */
39 #define FMC2_MAX_CE 2
40
41 /* Max ECC buffer length */
42 #define FMC2_MAX_ECC_BUF_LEN (FMC2_BCHDSRS_LEN * FMC2_MAX_SG)
43
44 #define FMC2_TIMEOUT_MS 5000
45
46 /* Timings */
47 #define FMC2_THIZ 1
48 #define FMC2_TIO 8000
49 #define FMC2_TSYNC 3000
50 #define FMC2_PCR_TIMING_MASK 0xf
51 #define FMC2_PMEM_PATT_TIMING_MASK 0xff
52
53 /* FMC2 Controller Registers */
54 #define FMC2_BCR1 0x0
55 #define FMC2_PCR 0x80
56 #define FMC2_SR 0x84
57 #define FMC2_PMEM 0x88
58 #define FMC2_PATT 0x8c
59 #define FMC2_HECCR 0x94
60 #define FMC2_ISR 0x184
61 #define FMC2_ICR 0x188
62 #define FMC2_CSQCR 0x200
63 #define FMC2_CSQCFGR1 0x204
64 #define FMC2_CSQCFGR2 0x208
65 #define FMC2_CSQCFGR3 0x20c
66 #define FMC2_CSQAR1 0x210
67 #define FMC2_CSQAR2 0x214
68 #define FMC2_CSQIER 0x220
69 #define FMC2_CSQISR 0x224
70 #define FMC2_CSQICR 0x228
71 #define FMC2_CSQEMSR 0x230
72 #define FMC2_BCHIER 0x250
73 #define FMC2_BCHISR 0x254
74 #define FMC2_BCHICR 0x258
75 #define FMC2_BCHPBR1 0x260
76 #define FMC2_BCHPBR2 0x264
77 #define FMC2_BCHPBR3 0x268
78 #define FMC2_BCHPBR4 0x26c
79 #define FMC2_BCHDSR0 0x27c
80 #define FMC2_BCHDSR1 0x280
81 #define FMC2_BCHDSR2 0x284
82 #define FMC2_BCHDSR3 0x288
83 #define FMC2_BCHDSR4 0x28c
84
85 /* Register: FMC2_BCR1 */
86 #define FMC2_BCR1_FMC2EN BIT(31)
87
88 /* Register: FMC2_PCR */
89 #define FMC2_PCR_PWAITEN BIT(1)
90 #define FMC2_PCR_PBKEN BIT(2)
91 #define FMC2_PCR_PWID GENMASK(5, 4)
92 #define FMC2_PCR_PWID_BUSWIDTH_8 0
93 #define FMC2_PCR_PWID_BUSWIDTH_16 1
94 #define FMC2_PCR_ECCEN BIT(6)
95 #define FMC2_PCR_ECCALG BIT(8)
96 #define FMC2_PCR_TCLR GENMASK(12, 9)
97 #define FMC2_PCR_TCLR_DEFAULT 0xf
98 #define FMC2_PCR_TAR GENMASK(16, 13)
99 #define FMC2_PCR_TAR_DEFAULT 0xf
100 #define FMC2_PCR_ECCSS GENMASK(19, 17)
101 #define FMC2_PCR_ECCSS_512 1
102 #define FMC2_PCR_ECCSS_2048 3
103 #define FMC2_PCR_BCHECC BIT(24)
104 #define FMC2_PCR_WEN BIT(25)
105
106 /* Register: FMC2_SR */
107 #define FMC2_SR_NWRF BIT(6)
108
109 /* Register: FMC2_PMEM */
110 #define FMC2_PMEM_MEMSET GENMASK(7, 0)
111 #define FMC2_PMEM_MEMWAIT GENMASK(15, 8)
112 #define FMC2_PMEM_MEMHOLD GENMASK(23, 16)
113 #define FMC2_PMEM_MEMHIZ GENMASK(31, 24)
114 #define FMC2_PMEM_DEFAULT 0x0a0a0a0a
115
116 /* Register: FMC2_PATT */
117 #define FMC2_PATT_ATTSET GENMASK(7, 0)
118 #define FMC2_PATT_ATTWAIT GENMASK(15, 8)
119 #define FMC2_PATT_ATTHOLD GENMASK(23, 16)
120 #define FMC2_PATT_ATTHIZ GENMASK(31, 24)
121 #define FMC2_PATT_DEFAULT 0x0a0a0a0a
122
123 /* Register: FMC2_ISR */
124 #define FMC2_ISR_IHLF BIT(1)
125
126 /* Register: FMC2_ICR */
127 #define FMC2_ICR_CIHLF BIT(1)
128
129 /* Register: FMC2_CSQCR */
130 #define FMC2_CSQCR_CSQSTART BIT(0)
131
132 /* Register: FMC2_CSQCFGR1 */
133 #define FMC2_CSQCFGR1_CMD2EN BIT(1)
134 #define FMC2_CSQCFGR1_DMADEN BIT(2)
135 #define FMC2_CSQCFGR1_ACYNBR GENMASK(6, 4)
136 #define FMC2_CSQCFGR1_CMD1 GENMASK(15, 8)
137 #define FMC2_CSQCFGR1_CMD2 GENMASK(23, 16)
138 #define FMC2_CSQCFGR1_CMD1T BIT(24)
139 #define FMC2_CSQCFGR1_CMD2T BIT(25)
140
141 /* Register: FMC2_CSQCFGR2 */
142 #define FMC2_CSQCFGR2_SQSDTEN BIT(0)
143 #define FMC2_CSQCFGR2_RCMD2EN BIT(1)
144 #define FMC2_CSQCFGR2_DMASEN BIT(2)
145 #define FMC2_CSQCFGR2_RCMD1 GENMASK(15, 8)
146 #define FMC2_CSQCFGR2_RCMD2 GENMASK(23, 16)
147 #define FMC2_CSQCFGR2_RCMD1T BIT(24)
148 #define FMC2_CSQCFGR2_RCMD2T BIT(25)
149
150 /* Register: FMC2_CSQCFGR3 */
151 #define FMC2_CSQCFGR3_SNBR GENMASK(13, 8)
152 #define FMC2_CSQCFGR3_AC1T BIT(16)
153 #define FMC2_CSQCFGR3_AC2T BIT(17)
154 #define FMC2_CSQCFGR3_AC3T BIT(18)
155 #define FMC2_CSQCFGR3_AC4T BIT(19)
156 #define FMC2_CSQCFGR3_AC5T BIT(20)
157 #define FMC2_CSQCFGR3_SDT BIT(21)
158 #define FMC2_CSQCFGR3_RAC1T BIT(22)
159 #define FMC2_CSQCFGR3_RAC2T BIT(23)
160
161 /* Register: FMC2_CSQCAR1 */
162 #define FMC2_CSQCAR1_ADDC1 GENMASK(7, 0)
163 #define FMC2_CSQCAR1_ADDC2 GENMASK(15, 8)
164 #define FMC2_CSQCAR1_ADDC3 GENMASK(23, 16)
165 #define FMC2_CSQCAR1_ADDC4 GENMASK(31, 24)
166
167 /* Register: FMC2_CSQCAR2 */
168 #define FMC2_CSQCAR2_ADDC5 GENMASK(7, 0)
169 #define FMC2_CSQCAR2_NANDCEN GENMASK(11, 10)
170 #define FMC2_CSQCAR2_SAO GENMASK(31, 16)
171
172 /* Register: FMC2_CSQIER */
173 #define FMC2_CSQIER_TCIE BIT(0)
174
175 /* Register: FMC2_CSQICR */
176 #define FMC2_CSQICR_CLEAR_IRQ GENMASK(4, 0)
177
178 /* Register: FMC2_CSQEMSR */
179 #define FMC2_CSQEMSR_SEM GENMASK(15, 0)
180
181 /* Register: FMC2_BCHIER */
182 #define FMC2_BCHIER_DERIE BIT(1)
183 #define FMC2_BCHIER_EPBRIE BIT(4)
184
185 /* Register: FMC2_BCHICR */
186 #define FMC2_BCHICR_CLEAR_IRQ GENMASK(4, 0)
187
188 /* Register: FMC2_BCHDSR0 */
189 #define FMC2_BCHDSR0_DUE BIT(0)
190 #define FMC2_BCHDSR0_DEF BIT(1)
191 #define FMC2_BCHDSR0_DEN GENMASK(7, 4)
192
193 /* Register: FMC2_BCHDSR1 */
194 #define FMC2_BCHDSR1_EBP1 GENMASK(12, 0)
195 #define FMC2_BCHDSR1_EBP2 GENMASK(28, 16)
196
197 /* Register: FMC2_BCHDSR2 */
198 #define FMC2_BCHDSR2_EBP3 GENMASK(12, 0)
199 #define FMC2_BCHDSR2_EBP4 GENMASK(28, 16)
200
201 /* Register: FMC2_BCHDSR3 */
202 #define FMC2_BCHDSR3_EBP5 GENMASK(12, 0)
203 #define FMC2_BCHDSR3_EBP6 GENMASK(28, 16)
204
205 /* Register: FMC2_BCHDSR4 */
206 #define FMC2_BCHDSR4_EBP7 GENMASK(12, 0)
207 #define FMC2_BCHDSR4_EBP8 GENMASK(28, 16)
208
209 enum stm32_fmc2_ecc {
210 FMC2_ECC_HAM = 1,
211 FMC2_ECC_BCH4 = 4,
212 FMC2_ECC_BCH8 = 8
213 };
214
215 enum stm32_fmc2_irq_state {
216 FMC2_IRQ_UNKNOWN = 0,
217 FMC2_IRQ_BCH,
218 FMC2_IRQ_SEQ
219 };
220
221 struct stm32_fmc2_timings {
222 u8 tclr;
223 u8 tar;
224 u8 thiz;
225 u8 twait;
226 u8 thold_mem;
227 u8 tset_mem;
228 u8 thold_att;
229 u8 tset_att;
230 };
231
232 struct stm32_fmc2_nand {
233 struct nand_chip chip;
234 struct stm32_fmc2_timings timings;
235 int ncs;
236 int cs_used[FMC2_MAX_CE];
237 };
238
239 static inline struct stm32_fmc2_nand *to_fmc2_nand(struct nand_chip *chip)
240 {
241 return container_of(chip, struct stm32_fmc2_nand, chip);
242 }
243
244 struct stm32_fmc2_nfc {
245 struct nand_controller base;
246 struct stm32_fmc2_nand nand;
247 struct device *dev;
248 struct device *cdev;
249 struct regmap *regmap;
250 void __iomem *data_base[FMC2_MAX_CE];
251 void __iomem *cmd_base[FMC2_MAX_CE];
252 void __iomem *addr_base[FMC2_MAX_CE];
253 phys_addr_t io_phys_addr;
254 phys_addr_t data_phys_addr[FMC2_MAX_CE];
255 struct clk *clk;
256 u8 irq_state;
257
258 struct dma_chan *dma_tx_ch;
259 struct dma_chan *dma_rx_ch;
260 struct dma_chan *dma_ecc_ch;
261 struct sg_table dma_data_sg;
262 struct sg_table dma_ecc_sg;
263 u8 *ecc_buf;
264 int dma_ecc_len;
265
266 struct completion complete;
267 struct completion dma_data_complete;
268 struct completion dma_ecc_complete;
269
270 u8 cs_assigned;
271 int cs_sel;
272 };
273
274 static inline struct stm32_fmc2_nfc *to_stm32_nfc(struct nand_controller *base)
275 {
276 return container_of(base, struct stm32_fmc2_nfc, base);
277 }
278
279 static void stm32_fmc2_nfc_timings_init(struct nand_chip *chip)
280 {
281 struct stm32_fmc2_nfc *nfc = to_stm32_nfc(chip->controller);
282 struct stm32_fmc2_nand *nand = to_fmc2_nand(chip);
283 struct stm32_fmc2_timings *timings = &nand->timings;
284 u32 pmem, patt;
285
286 /* Set tclr/tar timings */
287 regmap_update_bits(nfc->regmap, FMC2_PCR,
288 FMC2_PCR_TCLR | FMC2_PCR_TAR,
289 FIELD_PREP(FMC2_PCR_TCLR, timings->tclr) |
290 FIELD_PREP(FMC2_PCR_TAR, timings->tar));
291
292 /* Set tset/twait/thold/thiz timings in common bank */
293 pmem = FIELD_PREP(FMC2_PMEM_MEMSET, timings->tset_mem);
294 pmem |= FIELD_PREP(FMC2_PMEM_MEMWAIT, timings->twait);
295 pmem |= FIELD_PREP(FMC2_PMEM_MEMHOLD, timings->thold_mem);
296 pmem |= FIELD_PREP(FMC2_PMEM_MEMHIZ, timings->thiz);
297 regmap_write(nfc->regmap, FMC2_PMEM, pmem);
298
299 /* Set tset/twait/thold/thiz timings in attribut bank */
300 patt = FIELD_PREP(FMC2_PATT_ATTSET, timings->tset_att);
301 patt |= FIELD_PREP(FMC2_PATT_ATTWAIT, timings->twait);
302 patt |= FIELD_PREP(FMC2_PATT_ATTHOLD, timings->thold_att);
303 patt |= FIELD_PREP(FMC2_PATT_ATTHIZ, timings->thiz);
304 regmap_write(nfc->regmap, FMC2_PATT, patt);
305 }
306
307 static void stm32_fmc2_nfc_setup(struct nand_chip *chip)
308 {
309 struct stm32_fmc2_nfc *nfc = to_stm32_nfc(chip->controller);
310 u32 pcr = 0, pcr_mask;
311
312 /* Configure ECC algorithm (default configuration is Hamming) */
313 pcr_mask = FMC2_PCR_ECCALG;
314 pcr_mask |= FMC2_PCR_BCHECC;
315 if (chip->ecc.strength == FMC2_ECC_BCH8) {
316 pcr |= FMC2_PCR_ECCALG;
317 pcr |= FMC2_PCR_BCHECC;
318 } else if (chip->ecc.strength == FMC2_ECC_BCH4) {
319 pcr |= FMC2_PCR_ECCALG;
320 }
321
322 /* Set buswidth */
323 pcr_mask |= FMC2_PCR_PWID;
324 if (chip->options & NAND_BUSWIDTH_16)
325 pcr |= FIELD_PREP(FMC2_PCR_PWID, FMC2_PCR_PWID_BUSWIDTH_16);
326
327 /* Set ECC sector size */
328 pcr_mask |= FMC2_PCR_ECCSS;
329 pcr |= FIELD_PREP(FMC2_PCR_ECCSS, FMC2_PCR_ECCSS_512);
330
331 regmap_update_bits(nfc->regmap, FMC2_PCR, pcr_mask, pcr);
332 }
333
334 static int stm32_fmc2_nfc_select_chip(struct nand_chip *chip, int chipnr)
335 {
336 struct stm32_fmc2_nfc *nfc = to_stm32_nfc(chip->controller);
337 struct stm32_fmc2_nand *nand = to_fmc2_nand(chip);
338 struct dma_slave_config dma_cfg;
339 int ret;
340
341 if (nand->cs_used[chipnr] == nfc->cs_sel)
342 return 0;
343
344 nfc->cs_sel = nand->cs_used[chipnr];
345 stm32_fmc2_nfc_setup(chip);
346 stm32_fmc2_nfc_timings_init(chip);
347
348 if (nfc->dma_tx_ch && nfc->dma_rx_ch) {
349 memset(&dma_cfg, 0, sizeof(dma_cfg));
350 dma_cfg.src_addr = nfc->data_phys_addr[nfc->cs_sel];
351 dma_cfg.dst_addr = nfc->data_phys_addr[nfc->cs_sel];
352 dma_cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
353 dma_cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
354 dma_cfg.src_maxburst = 32;
355 dma_cfg.dst_maxburst = 32;
356
357 ret = dmaengine_slave_config(nfc->dma_tx_ch, &dma_cfg);
358 if (ret) {
359 dev_err(nfc->dev, "tx DMA engine slave config failed\n");
360 return ret;
361 }
362
363 ret = dmaengine_slave_config(nfc->dma_rx_ch, &dma_cfg);
364 if (ret) {
365 dev_err(nfc->dev, "rx DMA engine slave config failed\n");
366 return ret;
367 }
368 }
369
370 if (nfc->dma_ecc_ch) {
371 /*
372 * Hamming: we read HECCR register
373 * BCH4/BCH8: we read BCHDSRSx registers
374 */
375 memset(&dma_cfg, 0, sizeof(dma_cfg));
376 dma_cfg.src_addr = nfc->io_phys_addr;
377 dma_cfg.src_addr += chip->ecc.strength == FMC2_ECC_HAM ?
378 FMC2_HECCR : FMC2_BCHDSR0;
379 dma_cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
380
381 ret = dmaengine_slave_config(nfc->dma_ecc_ch, &dma_cfg);
382 if (ret) {
383 dev_err(nfc->dev, "ECC DMA engine slave config failed\n");
384 return ret;
385 }
386
387 /* Calculate ECC length needed for one sector */
388 nfc->dma_ecc_len = chip->ecc.strength == FMC2_ECC_HAM ?
389 FMC2_HECCR_LEN : FMC2_BCHDSRS_LEN;
390 }
391
392 return 0;
393 }
394
395 static void stm32_fmc2_nfc_set_buswidth_16(struct stm32_fmc2_nfc *nfc, bool set)
396 {
397 u32 pcr;
398
399 pcr = set ? FIELD_PREP(FMC2_PCR_PWID, FMC2_PCR_PWID_BUSWIDTH_16) :
400 FIELD_PREP(FMC2_PCR_PWID, FMC2_PCR_PWID_BUSWIDTH_8);
401
402 regmap_update_bits(nfc->regmap, FMC2_PCR, FMC2_PCR_PWID, pcr);
403 }
404
405 static void stm32_fmc2_nfc_set_ecc(struct stm32_fmc2_nfc *nfc, bool enable)
406 {
407 regmap_update_bits(nfc->regmap, FMC2_PCR, FMC2_PCR_ECCEN,
408 enable ? FMC2_PCR_ECCEN : 0);
409 }
410
411 static void stm32_fmc2_nfc_enable_seq_irq(struct stm32_fmc2_nfc *nfc)
412 {
413 nfc->irq_state = FMC2_IRQ_SEQ;
414
415 regmap_update_bits(nfc->regmap, FMC2_CSQIER,
416 FMC2_CSQIER_TCIE, FMC2_CSQIER_TCIE);
417 }
418
419 static void stm32_fmc2_nfc_disable_seq_irq(struct stm32_fmc2_nfc *nfc)
420 {
421 regmap_update_bits(nfc->regmap, FMC2_CSQIER, FMC2_CSQIER_TCIE, 0);
422
423 nfc->irq_state = FMC2_IRQ_UNKNOWN;
424 }
425
426 static void stm32_fmc2_nfc_clear_seq_irq(struct stm32_fmc2_nfc *nfc)
427 {
428 regmap_write(nfc->regmap, FMC2_CSQICR, FMC2_CSQICR_CLEAR_IRQ);
429 }
430
431 static void stm32_fmc2_nfc_enable_bch_irq(struct stm32_fmc2_nfc *nfc, int mode)
432 {
433 nfc->irq_state = FMC2_IRQ_BCH;
434
435 if (mode == NAND_ECC_WRITE)
436 regmap_update_bits(nfc->regmap, FMC2_BCHIER,
437 FMC2_BCHIER_EPBRIE, FMC2_BCHIER_EPBRIE);
438 else
439 regmap_update_bits(nfc->regmap, FMC2_BCHIER,
440 FMC2_BCHIER_DERIE, FMC2_BCHIER_DERIE);
441 }
442
443 static void stm32_fmc2_nfc_disable_bch_irq(struct stm32_fmc2_nfc *nfc)
444 {
445 regmap_update_bits(nfc->regmap, FMC2_BCHIER,
446 FMC2_BCHIER_DERIE | FMC2_BCHIER_EPBRIE, 0);
447
448 nfc->irq_state = FMC2_IRQ_UNKNOWN;
449 }
450
451 static void stm32_fmc2_nfc_clear_bch_irq(struct stm32_fmc2_nfc *nfc)
452 {
453 regmap_write(nfc->regmap, FMC2_BCHICR, FMC2_BCHICR_CLEAR_IRQ);
454 }
455
456 /*
457 * Enable ECC logic and reset syndrome/parity bits previously calculated
458 * Syndrome/parity bits is cleared by setting the ECCEN bit to 0
459 */
460 static void stm32_fmc2_nfc_hwctl(struct nand_chip *chip, int mode)
461 {
462 struct stm32_fmc2_nfc *nfc = to_stm32_nfc(chip->controller);
463
464 stm32_fmc2_nfc_set_ecc(nfc, false);
465
466 if (chip->ecc.strength != FMC2_ECC_HAM) {
467 regmap_update_bits(nfc->regmap, FMC2_PCR, FMC2_PCR_WEN,
468 mode == NAND_ECC_WRITE ? FMC2_PCR_WEN : 0);
469
470 reinit_completion(&nfc->complete);
471 stm32_fmc2_nfc_clear_bch_irq(nfc);
472 stm32_fmc2_nfc_enable_bch_irq(nfc, mode);
473 }
474
475 stm32_fmc2_nfc_set_ecc(nfc, true);
476 }
477
478 /*
479 * ECC Hamming calculation
480 * ECC is 3 bytes for 512 bytes of data (supports error correction up to
481 * max of 1-bit)
482 */
483 static void stm32_fmc2_nfc_ham_set_ecc(const u32 ecc_sta, u8 *ecc)
484 {
485 ecc[0] = ecc_sta;
486 ecc[1] = ecc_sta >> 8;
487 ecc[2] = ecc_sta >> 16;
488 }
489
490 static int stm32_fmc2_nfc_ham_calculate(struct nand_chip *chip, const u8 *data,
491 u8 *ecc)
492 {
493 struct stm32_fmc2_nfc *nfc = to_stm32_nfc(chip->controller);
494 u32 sr, heccr;
495 int ret;
496
497 ret = regmap_read_poll_timeout(nfc->regmap, FMC2_SR, sr,
498 sr & FMC2_SR_NWRF, 1,
499 1000 * FMC2_TIMEOUT_MS);
500 if (ret) {
501 dev_err(nfc->dev, "ham timeout\n");
502 return ret;
503 }
504
505 regmap_read(nfc->regmap, FMC2_HECCR, &heccr);
506 stm32_fmc2_nfc_ham_set_ecc(heccr, ecc);
507 stm32_fmc2_nfc_set_ecc(nfc, false);
508
509 return 0;
510 }
511
512 static int stm32_fmc2_nfc_ham_correct(struct nand_chip *chip, u8 *dat,
513 u8 *read_ecc, u8 *calc_ecc)
514 {
515 u8 bit_position = 0, b0, b1, b2;
516 u32 byte_addr = 0, b;
517 u32 i, shifting = 1;
518
519 /* Indicate which bit and byte is faulty (if any) */
520 b0 = read_ecc[0] ^ calc_ecc[0];
521 b1 = read_ecc[1] ^ calc_ecc[1];
522 b2 = read_ecc[2] ^ calc_ecc[2];
523 b = b0 | (b1 << 8) | (b2 << 16);
524
525 /* No errors */
526 if (likely(!b))
527 return 0;
528
529 /* Calculate bit position */
530 for (i = 0; i < 3; i++) {
531 switch (b % 4) {
532 case 2:
533 bit_position += shifting;
534 case 1:
535 break;
536 default:
537 return -EBADMSG;
538 }
539 shifting <<= 1;
540 b >>= 2;
541 }
542
543 /* Calculate byte position */
544 shifting = 1;
545 for (i = 0; i < 9; i++) {
546 switch (b % 4) {
547 case 2:
548 byte_addr += shifting;
549 case 1:
550 break;
551 default:
552 return -EBADMSG;
553 }
554 shifting <<= 1;
555 b >>= 2;
556 }
557
558 /* Flip the bit */
559 dat[byte_addr] ^= (1 << bit_position);
560
561 return 1;
562 }
563
564 /*
565 * ECC BCH calculation and correction
566 * ECC is 7/13 bytes for 512 bytes of data (supports error correction up to
567 * max of 4-bit/8-bit)
568 */
569 static int stm32_fmc2_nfc_bch_calculate(struct nand_chip *chip, const u8 *data,
570 u8 *ecc)
571 {
572 struct stm32_fmc2_nfc *nfc = to_stm32_nfc(chip->controller);
573 u32 bchpbr;
574
575 /* Wait until the BCH code is ready */
576 if (!wait_for_completion_timeout(&nfc->complete,
577 msecs_to_jiffies(FMC2_TIMEOUT_MS))) {
578 dev_err(nfc->dev, "bch timeout\n");
579 stm32_fmc2_nfc_disable_bch_irq(nfc);
580 return -ETIMEDOUT;
581 }
582
583 /* Read parity bits */
584 regmap_read(nfc->regmap, FMC2_BCHPBR1, &bchpbr);
585 ecc[0] = bchpbr;
586 ecc[1] = bchpbr >> 8;
587 ecc[2] = bchpbr >> 16;
588 ecc[3] = bchpbr >> 24;
589
590 regmap_read(nfc->regmap, FMC2_BCHPBR2, &bchpbr);
591 ecc[4] = bchpbr;
592 ecc[5] = bchpbr >> 8;
593 ecc[6] = bchpbr >> 16;
594
595 if (chip->ecc.strength == FMC2_ECC_BCH8) {
596 ecc[7] = bchpbr >> 24;
597
598 regmap_read(nfc->regmap, FMC2_BCHPBR3, &bchpbr);
599 ecc[8] = bchpbr;
600 ecc[9] = bchpbr >> 8;
601 ecc[10] = bchpbr >> 16;
602 ecc[11] = bchpbr >> 24;
603
604 regmap_read(nfc->regmap, FMC2_BCHPBR4, &bchpbr);
605 ecc[12] = bchpbr;
606 }
607
608 stm32_fmc2_nfc_set_ecc(nfc, false);
609
610 return 0;
611 }
612
613 static int stm32_fmc2_nfc_bch_decode(int eccsize, u8 *dat, u32 *ecc_sta)
614 {
615 u32 bchdsr0 = ecc_sta[0];
616 u32 bchdsr1 = ecc_sta[1];
617 u32 bchdsr2 = ecc_sta[2];
618 u32 bchdsr3 = ecc_sta[3];
619 u32 bchdsr4 = ecc_sta[4];
620 u16 pos[8];
621 int i, den;
622 unsigned int nb_errs = 0;
623
624 /* No errors found */
625 if (likely(!(bchdsr0 & FMC2_BCHDSR0_DEF)))
626 return 0;
627
628 /* Too many errors detected */
629 if (unlikely(bchdsr0 & FMC2_BCHDSR0_DUE))
630 return -EBADMSG;
631
632 pos[0] = FIELD_GET(FMC2_BCHDSR1_EBP1, bchdsr1);
633 pos[1] = FIELD_GET(FMC2_BCHDSR1_EBP2, bchdsr1);
634 pos[2] = FIELD_GET(FMC2_BCHDSR2_EBP3, bchdsr2);
635 pos[3] = FIELD_GET(FMC2_BCHDSR2_EBP4, bchdsr2);
636 pos[4] = FIELD_GET(FMC2_BCHDSR3_EBP5, bchdsr3);
637 pos[5] = FIELD_GET(FMC2_BCHDSR3_EBP6, bchdsr3);
638 pos[6] = FIELD_GET(FMC2_BCHDSR4_EBP7, bchdsr4);
639 pos[7] = FIELD_GET(FMC2_BCHDSR4_EBP8, bchdsr4);
640
641 den = FIELD_GET(FMC2_BCHDSR0_DEN, bchdsr0);
642 for (i = 0; i < den; i++) {
643 if (pos[i] < eccsize * 8) {
644 change_bit(pos[i], (unsigned long *)dat);
645 nb_errs++;
646 }
647 }
648
649 return nb_errs;
650 }
651
652 static int stm32_fmc2_nfc_bch_correct(struct nand_chip *chip, u8 *dat,
653 u8 *read_ecc, u8 *calc_ecc)
654 {
655 struct stm32_fmc2_nfc *nfc = to_stm32_nfc(chip->controller);
656 u32 ecc_sta[5];
657
658 /* Wait until the decoding error is ready */
659 if (!wait_for_completion_timeout(&nfc->complete,
660 msecs_to_jiffies(FMC2_TIMEOUT_MS))) {
661 dev_err(nfc->dev, "bch timeout\n");
662 stm32_fmc2_nfc_disable_bch_irq(nfc);
663 return -ETIMEDOUT;
664 }
665
666 regmap_bulk_read(nfc->regmap, FMC2_BCHDSR0, ecc_sta, 5);
667
668 stm32_fmc2_nfc_set_ecc(nfc, false);
669
670 return stm32_fmc2_nfc_bch_decode(chip->ecc.size, dat, ecc_sta);
671 }
672
673 static int stm32_fmc2_nfc_read_page(struct nand_chip *chip, u8 *buf,
674 int oob_required, int page)
675 {
676 struct mtd_info *mtd = nand_to_mtd(chip);
677 int ret, i, s, stat, eccsize = chip->ecc.size;
678 int eccbytes = chip->ecc.bytes;
679 int eccsteps = chip->ecc.steps;
680 int eccstrength = chip->ecc.strength;
681 u8 *p = buf;
682 u8 *ecc_calc = chip->ecc.calc_buf;
683 u8 *ecc_code = chip->ecc.code_buf;
684 unsigned int max_bitflips = 0;
685
686 ret = nand_read_page_op(chip, page, 0, NULL, 0);
687 if (ret)
688 return ret;
689
690 for (i = mtd->writesize + FMC2_BBM_LEN, s = 0; s < eccsteps;
691 s++, i += eccbytes, p += eccsize) {
692 chip->ecc.hwctl(chip, NAND_ECC_READ);
693
694 /* Read the nand page sector (512 bytes) */
695 ret = nand_change_read_column_op(chip, s * eccsize, p,
696 eccsize, false);
697 if (ret)
698 return ret;
699
700 /* Read the corresponding ECC bytes */
701 ret = nand_change_read_column_op(chip, i, ecc_code,
702 eccbytes, false);
703 if (ret)
704 return ret;
705
706 /* Correct the data */
707 stat = chip->ecc.correct(chip, p, ecc_code, ecc_calc);
708 if (stat == -EBADMSG)
709 /* Check for empty pages with bitflips */
710 stat = nand_check_erased_ecc_chunk(p, eccsize,
711 ecc_code, eccbytes,
712 NULL, 0,
713 eccstrength);
714
715 if (stat < 0) {
716 mtd->ecc_stats.failed++;
717 } else {
718 mtd->ecc_stats.corrected += stat;
719 max_bitflips = max_t(unsigned int, max_bitflips, stat);
720 }
721 }
722
723 /* Read oob */
724 if (oob_required) {
725 ret = nand_change_read_column_op(chip, mtd->writesize,
726 chip->oob_poi, mtd->oobsize,
727 false);
728 if (ret)
729 return ret;
730 }
731
732 return max_bitflips;
733 }
734
735 /* Sequencer read/write configuration */
736 static void stm32_fmc2_nfc_rw_page_init(struct nand_chip *chip, int page,
737 int raw, bool write_data)
738 {
739 struct stm32_fmc2_nfc *nfc = to_stm32_nfc(chip->controller);
740 struct mtd_info *mtd = nand_to_mtd(chip);
741 u32 ecc_offset = mtd->writesize + FMC2_BBM_LEN;
742 /*
743 * cfg[0] => csqcfgr1, cfg[1] => csqcfgr2, cfg[2] => csqcfgr3
744 * cfg[3] => csqar1, cfg[4] => csqar2
745 */
746 u32 cfg[5];
747
748 regmap_update_bits(nfc->regmap, FMC2_PCR, FMC2_PCR_WEN,
749 write_data ? FMC2_PCR_WEN : 0);
750
751 /*
752 * - Set Program Page/Page Read command
753 * - Enable DMA request data
754 * - Set timings
755 */
756 cfg[0] = FMC2_CSQCFGR1_DMADEN | FMC2_CSQCFGR1_CMD1T;
757 if (write_data)
758 cfg[0] |= FIELD_PREP(FMC2_CSQCFGR1_CMD1, NAND_CMD_SEQIN);
759 else
760 cfg[0] |= FIELD_PREP(FMC2_CSQCFGR1_CMD1, NAND_CMD_READ0) |
761 FMC2_CSQCFGR1_CMD2EN |
762 FIELD_PREP(FMC2_CSQCFGR1_CMD2, NAND_CMD_READSTART) |
763 FMC2_CSQCFGR1_CMD2T;
764
765 /*
766 * - Set Random Data Input/Random Data Read command
767 * - Enable the sequencer to access the Spare data area
768 * - Enable DMA request status decoding for read
769 * - Set timings
770 */
771 if (write_data)
772 cfg[1] = FIELD_PREP(FMC2_CSQCFGR2_RCMD1, NAND_CMD_RNDIN);
773 else
774 cfg[1] = FIELD_PREP(FMC2_CSQCFGR2_RCMD1, NAND_CMD_RNDOUT) |
775 FMC2_CSQCFGR2_RCMD2EN |
776 FIELD_PREP(FMC2_CSQCFGR2_RCMD2, NAND_CMD_RNDOUTSTART) |
777 FMC2_CSQCFGR2_RCMD1T |
778 FMC2_CSQCFGR2_RCMD2T;
779 if (!raw) {
780 cfg[1] |= write_data ? 0 : FMC2_CSQCFGR2_DMASEN;
781 cfg[1] |= FMC2_CSQCFGR2_SQSDTEN;
782 }
783
784 /*
785 * - Set the number of sectors to be written
786 * - Set timings
787 */
788 cfg[2] = FIELD_PREP(FMC2_CSQCFGR3_SNBR, chip->ecc.steps - 1);
789 if (write_data) {
790 cfg[2] |= FMC2_CSQCFGR3_RAC2T;
791 if (chip->options & NAND_ROW_ADDR_3)
792 cfg[2] |= FMC2_CSQCFGR3_AC5T;
793 else
794 cfg[2] |= FMC2_CSQCFGR3_AC4T;
795 }
796
797 /*
798 * Set the fourth first address cycles
799 * Byte 1 and byte 2 => column, we start at 0x0
800 * Byte 3 and byte 4 => page
801 */
802 cfg[3] = FIELD_PREP(FMC2_CSQCAR1_ADDC3, page);
803 cfg[3] |= FIELD_PREP(FMC2_CSQCAR1_ADDC4, page >> 8);
804
805 /*
806 * - Set chip enable number
807 * - Set ECC byte offset in the spare area
808 * - Calculate the number of address cycles to be issued
809 * - Set byte 5 of address cycle if needed
810 */
811 cfg[4] = FIELD_PREP(FMC2_CSQCAR2_NANDCEN, nfc->cs_sel);
812 if (chip->options & NAND_BUSWIDTH_16)
813 cfg[4] |= FIELD_PREP(FMC2_CSQCAR2_SAO, ecc_offset >> 1);
814 else
815 cfg[4] |= FIELD_PREP(FMC2_CSQCAR2_SAO, ecc_offset);
816 if (chip->options & NAND_ROW_ADDR_3) {
817 cfg[0] |= FIELD_PREP(FMC2_CSQCFGR1_ACYNBR, 5);
818 cfg[4] |= FIELD_PREP(FMC2_CSQCAR2_ADDC5, page >> 16);
819 } else {
820 cfg[0] |= FIELD_PREP(FMC2_CSQCFGR1_ACYNBR, 4);
821 }
822
823 regmap_bulk_write(nfc->regmap, FMC2_CSQCFGR1, cfg, 5);
824 }
825
826 static void stm32_fmc2_nfc_dma_callback(void *arg)
827 {
828 complete((struct completion *)arg);
829 }
830
831 /* Read/write data from/to a page */
832 static int stm32_fmc2_nfc_xfer(struct nand_chip *chip, const u8 *buf,
833 int raw, bool write_data)
834 {
835 struct stm32_fmc2_nfc *nfc = to_stm32_nfc(chip->controller);
836 struct dma_async_tx_descriptor *desc_data, *desc_ecc;
837 struct scatterlist *sg;
838 struct dma_chan *dma_ch = nfc->dma_rx_ch;
839 enum dma_data_direction dma_data_dir = DMA_FROM_DEVICE;
840 enum dma_transfer_direction dma_transfer_dir = DMA_DEV_TO_MEM;
841 int eccsteps = chip->ecc.steps;
842 int eccsize = chip->ecc.size;
843 unsigned long timeout = msecs_to_jiffies(FMC2_TIMEOUT_MS);
844 const u8 *p = buf;
845 int s, ret;
846
847 /* Configure DMA data */
848 if (write_data) {
849 dma_data_dir = DMA_TO_DEVICE;
850 dma_transfer_dir = DMA_MEM_TO_DEV;
851 dma_ch = nfc->dma_tx_ch;
852 }
853
854 for_each_sg(nfc->dma_data_sg.sgl, sg, eccsteps, s) {
855 sg_set_buf(sg, p, eccsize);
856 p += eccsize;
857 }
858
859 ret = dma_map_sg(nfc->dev, nfc->dma_data_sg.sgl,
860 eccsteps, dma_data_dir);
861 if (ret < 0)
862 return ret;
863
864 desc_data = dmaengine_prep_slave_sg(dma_ch, nfc->dma_data_sg.sgl,
865 eccsteps, dma_transfer_dir,
866 DMA_PREP_INTERRUPT);
867 if (!desc_data) {
868 ret = -ENOMEM;
869 goto err_unmap_data;
870 }
871
872 reinit_completion(&nfc->dma_data_complete);
873 reinit_completion(&nfc->complete);
874 desc_data->callback = stm32_fmc2_nfc_dma_callback;
875 desc_data->callback_param = &nfc->dma_data_complete;
876 ret = dma_submit_error(dmaengine_submit(desc_data));
877 if (ret)
878 goto err_unmap_data;
879
880 dma_async_issue_pending(dma_ch);
881
882 if (!write_data && !raw) {
883 /* Configure DMA ECC status */
884 p = nfc->ecc_buf;
885 for_each_sg(nfc->dma_ecc_sg.sgl, sg, eccsteps, s) {
886 sg_set_buf(sg, p, nfc->dma_ecc_len);
887 p += nfc->dma_ecc_len;
888 }
889
890 ret = dma_map_sg(nfc->dev, nfc->dma_ecc_sg.sgl,
891 eccsteps, dma_data_dir);
892 if (ret < 0)
893 goto err_unmap_data;
894
895 desc_ecc = dmaengine_prep_slave_sg(nfc->dma_ecc_ch,
896 nfc->dma_ecc_sg.sgl,
897 eccsteps, dma_transfer_dir,
898 DMA_PREP_INTERRUPT);
899 if (!desc_ecc) {
900 ret = -ENOMEM;
901 goto err_unmap_ecc;
902 }
903
904 reinit_completion(&nfc->dma_ecc_complete);
905 desc_ecc->callback = stm32_fmc2_nfc_dma_callback;
906 desc_ecc->callback_param = &nfc->dma_ecc_complete;
907 ret = dma_submit_error(dmaengine_submit(desc_ecc));
908 if (ret)
909 goto err_unmap_ecc;
910
911 dma_async_issue_pending(nfc->dma_ecc_ch);
912 }
913
914 stm32_fmc2_nfc_clear_seq_irq(nfc);
915 stm32_fmc2_nfc_enable_seq_irq(nfc);
916
917 /* Start the transfer */
918 regmap_update_bits(nfc->regmap, FMC2_CSQCR,
919 FMC2_CSQCR_CSQSTART, FMC2_CSQCR_CSQSTART);
920
921 /* Wait end of sequencer transfer */
922 if (!wait_for_completion_timeout(&nfc->complete, timeout)) {
923 dev_err(nfc->dev, "seq timeout\n");
924 stm32_fmc2_nfc_disable_seq_irq(nfc);
925 dmaengine_terminate_all(dma_ch);
926 if (!write_data && !raw)
927 dmaengine_terminate_all(nfc->dma_ecc_ch);
928 ret = -ETIMEDOUT;
929 goto err_unmap_ecc;
930 }
931
932 /* Wait DMA data transfer completion */
933 if (!wait_for_completion_timeout(&nfc->dma_data_complete, timeout)) {
934 dev_err(nfc->dev, "data DMA timeout\n");
935 dmaengine_terminate_all(dma_ch);
936 ret = -ETIMEDOUT;
937 }
938
939 /* Wait DMA ECC transfer completion */
940 if (!write_data && !raw) {
941 if (!wait_for_completion_timeout(&nfc->dma_ecc_complete,
942 timeout)) {
943 dev_err(nfc->dev, "ECC DMA timeout\n");
944 dmaengine_terminate_all(nfc->dma_ecc_ch);
945 ret = -ETIMEDOUT;
946 }
947 }
948
949 err_unmap_ecc:
950 if (!write_data && !raw)
951 dma_unmap_sg(nfc->dev, nfc->dma_ecc_sg.sgl,
952 eccsteps, dma_data_dir);
953
954 err_unmap_data:
955 dma_unmap_sg(nfc->dev, nfc->dma_data_sg.sgl, eccsteps, dma_data_dir);
956
957 return ret;
958 }
959
960 static int stm32_fmc2_nfc_seq_write(struct nand_chip *chip, const u8 *buf,
961 int oob_required, int page, int raw)
962 {
963 struct mtd_info *mtd = nand_to_mtd(chip);
964 int ret;
965
966 /* Configure the sequencer */
967 stm32_fmc2_nfc_rw_page_init(chip, page, raw, true);
968
969 /* Write the page */
970 ret = stm32_fmc2_nfc_xfer(chip, buf, raw, true);
971 if (ret)
972 return ret;
973
974 /* Write oob */
975 if (oob_required) {
976 ret = nand_change_write_column_op(chip, mtd->writesize,
977 chip->oob_poi, mtd->oobsize,
978 false);
979 if (ret)
980 return ret;
981 }
982
983 return nand_prog_page_end_op(chip);
984 }
985
986 static int stm32_fmc2_nfc_seq_write_page(struct nand_chip *chip, const u8 *buf,
987 int oob_required, int page)
988 {
989 int ret;
990
991 ret = stm32_fmc2_nfc_select_chip(chip, chip->cur_cs);
992 if (ret)
993 return ret;
994
995 return stm32_fmc2_nfc_seq_write(chip, buf, oob_required, page, false);
996 }
997
998 static int stm32_fmc2_nfc_seq_write_page_raw(struct nand_chip *chip,
999 const u8 *buf, int oob_required,
1000 int page)
1001 {
1002 int ret;
1003
1004 ret = stm32_fmc2_nfc_select_chip(chip, chip->cur_cs);
1005 if (ret)
1006 return ret;
1007
1008 return stm32_fmc2_nfc_seq_write(chip, buf, oob_required, page, true);
1009 }
1010
1011 /* Get a status indicating which sectors have errors */
1012 static u16 stm32_fmc2_nfc_get_mapping_status(struct stm32_fmc2_nfc *nfc)
1013 {
1014 u32 csqemsr;
1015
1016 regmap_read(nfc->regmap, FMC2_CSQEMSR, &csqemsr);
1017
1018 return FIELD_GET(FMC2_CSQEMSR_SEM, csqemsr);
1019 }
1020
1021 static int stm32_fmc2_nfc_seq_correct(struct nand_chip *chip, u8 *dat,
1022 u8 *read_ecc, u8 *calc_ecc)
1023 {
1024 struct mtd_info *mtd = nand_to_mtd(chip);
1025 struct stm32_fmc2_nfc *nfc = to_stm32_nfc(chip->controller);
1026 int eccbytes = chip->ecc.bytes;
1027 int eccsteps = chip->ecc.steps;
1028 int eccstrength = chip->ecc.strength;
1029 int i, s, eccsize = chip->ecc.size;
1030 u32 *ecc_sta = (u32 *)nfc->ecc_buf;
1031 u16 sta_map = stm32_fmc2_nfc_get_mapping_status(nfc);
1032 unsigned int max_bitflips = 0;
1033
1034 for (i = 0, s = 0; s < eccsteps; s++, i += eccbytes, dat += eccsize) {
1035 int stat = 0;
1036
1037 if (eccstrength == FMC2_ECC_HAM) {
1038 /* Ecc_sta = FMC2_HECCR */
1039 if (sta_map & BIT(s)) {
1040 stm32_fmc2_nfc_ham_set_ecc(*ecc_sta,
1041 &calc_ecc[i]);
1042 stat = stm32_fmc2_nfc_ham_correct(chip, dat,
1043 &read_ecc[i],
1044 &calc_ecc[i]);
1045 }
1046 ecc_sta++;
1047 } else {
1048 /*
1049 * Ecc_sta[0] = FMC2_BCHDSR0
1050 * Ecc_sta[1] = FMC2_BCHDSR1
1051 * Ecc_sta[2] = FMC2_BCHDSR2
1052 * Ecc_sta[3] = FMC2_BCHDSR3
1053 * Ecc_sta[4] = FMC2_BCHDSR4
1054 */
1055 if (sta_map & BIT(s))
1056 stat = stm32_fmc2_nfc_bch_decode(eccsize, dat,
1057 ecc_sta);
1058 ecc_sta += 5;
1059 }
1060
1061 if (stat == -EBADMSG)
1062 /* Check for empty pages with bitflips */
1063 stat = nand_check_erased_ecc_chunk(dat, eccsize,
1064 &read_ecc[i],
1065 eccbytes,
1066 NULL, 0,
1067 eccstrength);
1068
1069 if (stat < 0) {
1070 mtd->ecc_stats.failed++;
1071 } else {
1072 mtd->ecc_stats.corrected += stat;
1073 max_bitflips = max_t(unsigned int, max_bitflips, stat);
1074 }
1075 }
1076
1077 return max_bitflips;
1078 }
1079
1080 static int stm32_fmc2_nfc_seq_read_page(struct nand_chip *chip, u8 *buf,
1081 int oob_required, int page)
1082 {
1083 struct mtd_info *mtd = nand_to_mtd(chip);
1084 struct stm32_fmc2_nfc *nfc = to_stm32_nfc(chip->controller);
1085 u8 *ecc_calc = chip->ecc.calc_buf;
1086 u8 *ecc_code = chip->ecc.code_buf;
1087 u16 sta_map;
1088 int ret;
1089
1090 ret = stm32_fmc2_nfc_select_chip(chip, chip->cur_cs);
1091 if (ret)
1092 return ret;
1093
1094 /* Configure the sequencer */
1095 stm32_fmc2_nfc_rw_page_init(chip, page, 0, false);
1096
1097 /* Read the page */
1098 ret = stm32_fmc2_nfc_xfer(chip, buf, 0, false);
1099 if (ret)
1100 return ret;
1101
1102 sta_map = stm32_fmc2_nfc_get_mapping_status(nfc);
1103
1104 /* Check if errors happen */
1105 if (likely(!sta_map)) {
1106 if (oob_required)
1107 return nand_change_read_column_op(chip, mtd->writesize,
1108 chip->oob_poi,
1109 mtd->oobsize, false);
1110
1111 return 0;
1112 }
1113
1114 /* Read oob */
1115 ret = nand_change_read_column_op(chip, mtd->writesize,
1116 chip->oob_poi, mtd->oobsize, false);
1117 if (ret)
1118 return ret;
1119
1120 ret = mtd_ooblayout_get_eccbytes(mtd, ecc_code, chip->oob_poi, 0,
1121 chip->ecc.total);
1122 if (ret)
1123 return ret;
1124
1125 /* Correct data */
1126 return chip->ecc.correct(chip, buf, ecc_code, ecc_calc);
1127 }
1128
1129 static int stm32_fmc2_nfc_seq_read_page_raw(struct nand_chip *chip, u8 *buf,
1130 int oob_required, int page)
1131 {
1132 struct mtd_info *mtd = nand_to_mtd(chip);
1133 int ret;
1134
1135 ret = stm32_fmc2_nfc_select_chip(chip, chip->cur_cs);
1136 if (ret)
1137 return ret;
1138
1139 /* Configure the sequencer */
1140 stm32_fmc2_nfc_rw_page_init(chip, page, 1, false);
1141
1142 /* Read the page */
1143 ret = stm32_fmc2_nfc_xfer(chip, buf, 1, false);
1144 if (ret)
1145 return ret;
1146
1147 /* Read oob */
1148 if (oob_required)
1149 return nand_change_read_column_op(chip, mtd->writesize,
1150 chip->oob_poi, mtd->oobsize,
1151 false);
1152
1153 return 0;
1154 }
1155
1156 static irqreturn_t stm32_fmc2_nfc_irq(int irq, void *dev_id)
1157 {
1158 struct stm32_fmc2_nfc *nfc = (struct stm32_fmc2_nfc *)dev_id;
1159
1160 if (nfc->irq_state == FMC2_IRQ_SEQ)
1161 /* Sequencer is used */
1162 stm32_fmc2_nfc_disable_seq_irq(nfc);
1163 else if (nfc->irq_state == FMC2_IRQ_BCH)
1164 /* BCH is used */
1165 stm32_fmc2_nfc_disable_bch_irq(nfc);
1166
1167 complete(&nfc->complete);
1168
1169 return IRQ_HANDLED;
1170 }
1171
1172 static void stm32_fmc2_nfc_read_data(struct nand_chip *chip, void *buf,
1173 unsigned int len, bool force_8bit)
1174 {
1175 struct stm32_fmc2_nfc *nfc = to_stm32_nfc(chip->controller);
1176 void __iomem *io_addr_r = nfc->data_base[nfc->cs_sel];
1177
1178 if (force_8bit && chip->options & NAND_BUSWIDTH_16)
1179 /* Reconfigure bus width to 8-bit */
1180 stm32_fmc2_nfc_set_buswidth_16(nfc, false);
1181
1182 if (!IS_ALIGNED((uintptr_t)buf, sizeof(u32))) {
1183 if (!IS_ALIGNED((uintptr_t)buf, sizeof(u16)) && len) {
1184 *(u8 *)buf = readb_relaxed(io_addr_r);
1185 buf += sizeof(u8);
1186 len -= sizeof(u8);
1187 }
1188
1189 if (!IS_ALIGNED((uintptr_t)buf, sizeof(u32)) &&
1190 len >= sizeof(u16)) {
1191 *(u16 *)buf = readw_relaxed(io_addr_r);
1192 buf += sizeof(u16);
1193 len -= sizeof(u16);
1194 }
1195 }
1196
1197 /* Buf is aligned */
1198 while (len >= sizeof(u32)) {
1199 *(u32 *)buf = readl_relaxed(io_addr_r);
1200 buf += sizeof(u32);
1201 len -= sizeof(u32);
1202 }
1203
1204 /* Read remaining bytes */
1205 if (len >= sizeof(u16)) {
1206 *(u16 *)buf = readw_relaxed(io_addr_r);
1207 buf += sizeof(u16);
1208 len -= sizeof(u16);
1209 }
1210
1211 if (len)
1212 *(u8 *)buf = readb_relaxed(io_addr_r);
1213
1214 if (force_8bit && chip->options & NAND_BUSWIDTH_16)
1215 /* Reconfigure bus width to 16-bit */
1216 stm32_fmc2_nfc_set_buswidth_16(nfc, true);
1217 }
1218
1219 static void stm32_fmc2_nfc_write_data(struct nand_chip *chip, const void *buf,
1220 unsigned int len, bool force_8bit)
1221 {
1222 struct stm32_fmc2_nfc *nfc = to_stm32_nfc(chip->controller);
1223 void __iomem *io_addr_w = nfc->data_base[nfc->cs_sel];
1224
1225 if (force_8bit && chip->options & NAND_BUSWIDTH_16)
1226 /* Reconfigure bus width to 8-bit */
1227 stm32_fmc2_nfc_set_buswidth_16(nfc, false);
1228
1229 if (!IS_ALIGNED((uintptr_t)buf, sizeof(u32))) {
1230 if (!IS_ALIGNED((uintptr_t)buf, sizeof(u16)) && len) {
1231 writeb_relaxed(*(u8 *)buf, io_addr_w);
1232 buf += sizeof(u8);
1233 len -= sizeof(u8);
1234 }
1235
1236 if (!IS_ALIGNED((uintptr_t)buf, sizeof(u32)) &&
1237 len >= sizeof(u16)) {
1238 writew_relaxed(*(u16 *)buf, io_addr_w);
1239 buf += sizeof(u16);
1240 len -= sizeof(u16);
1241 }
1242 }
1243
1244 /* Buf is aligned */
1245 while (len >= sizeof(u32)) {
1246 writel_relaxed(*(u32 *)buf, io_addr_w);
1247 buf += sizeof(u32);
1248 len -= sizeof(u32);
1249 }
1250
1251 /* Write remaining bytes */
1252 if (len >= sizeof(u16)) {
1253 writew_relaxed(*(u16 *)buf, io_addr_w);
1254 buf += sizeof(u16);
1255 len -= sizeof(u16);
1256 }
1257
1258 if (len)
1259 writeb_relaxed(*(u8 *)buf, io_addr_w);
1260
1261 if (force_8bit && chip->options & NAND_BUSWIDTH_16)
1262 /* Reconfigure bus width to 16-bit */
1263 stm32_fmc2_nfc_set_buswidth_16(nfc, true);
1264 }
1265
1266 static int stm32_fmc2_nfc_waitrdy(struct nand_chip *chip,
1267 unsigned long timeout_ms)
1268 {
1269 struct stm32_fmc2_nfc *nfc = to_stm32_nfc(chip->controller);
1270 const struct nand_sdr_timings *timings;
1271 u32 isr, sr;
1272
1273 /* Check if there is no pending requests to the NAND flash */
1274 if (regmap_read_poll_timeout(nfc->regmap, FMC2_SR, sr,
1275 sr & FMC2_SR_NWRF, 1,
1276 1000 * FMC2_TIMEOUT_MS))
1277 dev_warn(nfc->dev, "Waitrdy timeout\n");
1278
1279 /* Wait tWB before R/B# signal is low */
1280 timings = nand_get_sdr_timings(nand_get_interface_config(chip));
1281 ndelay(PSEC_TO_NSEC(timings->tWB_max));
1282
1283 /* R/B# signal is low, clear high level flag */
1284 regmap_write(nfc->regmap, FMC2_ICR, FMC2_ICR_CIHLF);
1285
1286 /* Wait R/B# signal is high */
1287 return regmap_read_poll_timeout(nfc->regmap, FMC2_ISR, isr,
1288 isr & FMC2_ISR_IHLF, 5,
1289 1000 * FMC2_TIMEOUT_MS);
1290 }
1291
1292 static int stm32_fmc2_nfc_exec_op(struct nand_chip *chip,
1293 const struct nand_operation *op,
1294 bool check_only)
1295 {
1296 struct stm32_fmc2_nfc *nfc = to_stm32_nfc(chip->controller);
1297 const struct nand_op_instr *instr = NULL;
1298 unsigned int op_id, i, timeout;
1299 int ret;
1300
1301 if (check_only)
1302 return 0;
1303
1304 ret = stm32_fmc2_nfc_select_chip(chip, op->cs);
1305 if (ret)
1306 return ret;
1307
1308 for (op_id = 0; op_id < op->ninstrs; op_id++) {
1309 instr = &op->instrs[op_id];
1310
1311 switch (instr->type) {
1312 case NAND_OP_CMD_INSTR:
1313 writeb_relaxed(instr->ctx.cmd.opcode,
1314 nfc->cmd_base[nfc->cs_sel]);
1315 break;
1316
1317 case NAND_OP_ADDR_INSTR:
1318 for (i = 0; i < instr->ctx.addr.naddrs; i++)
1319 writeb_relaxed(instr->ctx.addr.addrs[i],
1320 nfc->addr_base[nfc->cs_sel]);
1321 break;
1322
1323 case NAND_OP_DATA_IN_INSTR:
1324 stm32_fmc2_nfc_read_data(chip, instr->ctx.data.buf.in,
1325 instr->ctx.data.len,
1326 instr->ctx.data.force_8bit);
1327 break;
1328
1329 case NAND_OP_DATA_OUT_INSTR:
1330 stm32_fmc2_nfc_write_data(chip, instr->ctx.data.buf.out,
1331 instr->ctx.data.len,
1332 instr->ctx.data.force_8bit);
1333 break;
1334
1335 case NAND_OP_WAITRDY_INSTR:
1336 timeout = instr->ctx.waitrdy.timeout_ms;
1337 ret = stm32_fmc2_nfc_waitrdy(chip, timeout);
1338 break;
1339 }
1340 }
1341
1342 return ret;
1343 }
1344
1345 static void stm32_fmc2_nfc_init(struct stm32_fmc2_nfc *nfc)
1346 {
1347 u32 pcr;
1348
1349 regmap_read(nfc->regmap, FMC2_PCR, &pcr);
1350
1351 /* Set CS used to undefined */
1352 nfc->cs_sel = -1;
1353
1354 /* Enable wait feature and nand flash memory bank */
1355 pcr |= FMC2_PCR_PWAITEN;
1356 pcr |= FMC2_PCR_PBKEN;
1357
1358 /* Set buswidth to 8 bits mode for identification */
1359 pcr &= ~FMC2_PCR_PWID;
1360
1361 /* ECC logic is disabled */
1362 pcr &= ~FMC2_PCR_ECCEN;
1363
1364 /* Default mode */
1365 pcr &= ~FMC2_PCR_ECCALG;
1366 pcr &= ~FMC2_PCR_BCHECC;
1367 pcr &= ~FMC2_PCR_WEN;
1368
1369 /* Set default ECC sector size */
1370 pcr &= ~FMC2_PCR_ECCSS;
1371 pcr |= FIELD_PREP(FMC2_PCR_ECCSS, FMC2_PCR_ECCSS_2048);
1372
1373 /* Set default tclr/tar timings */
1374 pcr &= ~FMC2_PCR_TCLR;
1375 pcr |= FIELD_PREP(FMC2_PCR_TCLR, FMC2_PCR_TCLR_DEFAULT);
1376 pcr &= ~FMC2_PCR_TAR;
1377 pcr |= FIELD_PREP(FMC2_PCR_TAR, FMC2_PCR_TAR_DEFAULT);
1378
1379 /* Enable FMC2 controller */
1380 if (nfc->dev == nfc->cdev)
1381 regmap_update_bits(nfc->regmap, FMC2_BCR1,
1382 FMC2_BCR1_FMC2EN, FMC2_BCR1_FMC2EN);
1383
1384 regmap_write(nfc->regmap, FMC2_PCR, pcr);
1385 regmap_write(nfc->regmap, FMC2_PMEM, FMC2_PMEM_DEFAULT);
1386 regmap_write(nfc->regmap, FMC2_PATT, FMC2_PATT_DEFAULT);
1387 }
1388
1389 static void stm32_fmc2_nfc_calc_timings(struct nand_chip *chip,
1390 const struct nand_sdr_timings *sdrt)
1391 {
1392 struct stm32_fmc2_nfc *nfc = to_stm32_nfc(chip->controller);
1393 struct stm32_fmc2_nand *nand = to_fmc2_nand(chip);
1394 struct stm32_fmc2_timings *tims = &nand->timings;
1395 unsigned long hclk = clk_get_rate(nfc->clk);
1396 unsigned long hclkp = NSEC_PER_SEC / (hclk / 1000);
1397 unsigned long timing, tar, tclr, thiz, twait;
1398 unsigned long tset_mem, tset_att, thold_mem, thold_att;
1399
1400 tar = max_t(unsigned long, hclkp, sdrt->tAR_min);
1401 timing = DIV_ROUND_UP(tar, hclkp) - 1;
1402 tims->tar = min_t(unsigned long, timing, FMC2_PCR_TIMING_MASK);
1403
1404 tclr = max_t(unsigned long, hclkp, sdrt->tCLR_min);
1405 timing = DIV_ROUND_UP(tclr, hclkp) - 1;
1406 tims->tclr = min_t(unsigned long, timing, FMC2_PCR_TIMING_MASK);
1407
1408 tims->thiz = FMC2_THIZ;
1409 thiz = (tims->thiz + 1) * hclkp;
1410
1411 /*
1412 * tWAIT > tRP
1413 * tWAIT > tWP
1414 * tWAIT > tREA + tIO
1415 */
1416 twait = max_t(unsigned long, hclkp, sdrt->tRP_min);
1417 twait = max_t(unsigned long, twait, sdrt->tWP_min);
1418 twait = max_t(unsigned long, twait, sdrt->tREA_max + FMC2_TIO);
1419 timing = DIV_ROUND_UP(twait, hclkp);
1420 tims->twait = clamp_val(timing, 1, FMC2_PMEM_PATT_TIMING_MASK);
1421
1422 /*
1423 * tSETUP_MEM > tCS - tWAIT
1424 * tSETUP_MEM > tALS - tWAIT
1425 * tSETUP_MEM > tDS - (tWAIT - tHIZ)
1426 */
1427 tset_mem = hclkp;
1428 if (sdrt->tCS_min > twait && (tset_mem < sdrt->tCS_min - twait))
1429 tset_mem = sdrt->tCS_min - twait;
1430 if (sdrt->tALS_min > twait && (tset_mem < sdrt->tALS_min - twait))
1431 tset_mem = sdrt->tALS_min - twait;
1432 if (twait > thiz && (sdrt->tDS_min > twait - thiz) &&
1433 (tset_mem < sdrt->tDS_min - (twait - thiz)))
1434 tset_mem = sdrt->tDS_min - (twait - thiz);
1435 timing = DIV_ROUND_UP(tset_mem, hclkp);
1436 tims->tset_mem = clamp_val(timing, 1, FMC2_PMEM_PATT_TIMING_MASK);
1437
1438 /*
1439 * tHOLD_MEM > tCH
1440 * tHOLD_MEM > tREH - tSETUP_MEM
1441 * tHOLD_MEM > max(tRC, tWC) - (tSETUP_MEM + tWAIT)
1442 */
1443 thold_mem = max_t(unsigned long, hclkp, sdrt->tCH_min);
1444 if (sdrt->tREH_min > tset_mem &&
1445 (thold_mem < sdrt->tREH_min - tset_mem))
1446 thold_mem = sdrt->tREH_min - tset_mem;
1447 if ((sdrt->tRC_min > tset_mem + twait) &&
1448 (thold_mem < sdrt->tRC_min - (tset_mem + twait)))
1449 thold_mem = sdrt->tRC_min - (tset_mem + twait);
1450 if ((sdrt->tWC_min > tset_mem + twait) &&
1451 (thold_mem < sdrt->tWC_min - (tset_mem + twait)))
1452 thold_mem = sdrt->tWC_min - (tset_mem + twait);
1453 timing = DIV_ROUND_UP(thold_mem, hclkp);
1454 tims->thold_mem = clamp_val(timing, 1, FMC2_PMEM_PATT_TIMING_MASK);
1455
1456 /*
1457 * tSETUP_ATT > tCS - tWAIT
1458 * tSETUP_ATT > tCLS - tWAIT
1459 * tSETUP_ATT > tALS - tWAIT
1460 * tSETUP_ATT > tRHW - tHOLD_MEM
1461 * tSETUP_ATT > tDS - (tWAIT - tHIZ)
1462 */
1463 tset_att = hclkp;
1464 if (sdrt->tCS_min > twait && (tset_att < sdrt->tCS_min - twait))
1465 tset_att = sdrt->tCS_min - twait;
1466 if (sdrt->tCLS_min > twait && (tset_att < sdrt->tCLS_min - twait))
1467 tset_att = sdrt->tCLS_min - twait;
1468 if (sdrt->tALS_min > twait && (tset_att < sdrt->tALS_min - twait))
1469 tset_att = sdrt->tALS_min - twait;
1470 if (sdrt->tRHW_min > thold_mem &&
1471 (tset_att < sdrt->tRHW_min - thold_mem))
1472 tset_att = sdrt->tRHW_min - thold_mem;
1473 if (twait > thiz && (sdrt->tDS_min > twait - thiz) &&
1474 (tset_att < sdrt->tDS_min - (twait - thiz)))
1475 tset_att = sdrt->tDS_min - (twait - thiz);
1476 timing = DIV_ROUND_UP(tset_att, hclkp);
1477 tims->tset_att = clamp_val(timing, 1, FMC2_PMEM_PATT_TIMING_MASK);
1478
1479 /*
1480 * tHOLD_ATT > tALH
1481 * tHOLD_ATT > tCH
1482 * tHOLD_ATT > tCLH
1483 * tHOLD_ATT > tCOH
1484 * tHOLD_ATT > tDH
1485 * tHOLD_ATT > tWB + tIO + tSYNC - tSETUP_MEM
1486 * tHOLD_ATT > tADL - tSETUP_MEM
1487 * tHOLD_ATT > tWH - tSETUP_MEM
1488 * tHOLD_ATT > tWHR - tSETUP_MEM
1489 * tHOLD_ATT > tRC - (tSETUP_ATT + tWAIT)
1490 * tHOLD_ATT > tWC - (tSETUP_ATT + tWAIT)
1491 */
1492 thold_att = max_t(unsigned long, hclkp, sdrt->tALH_min);
1493 thold_att = max_t(unsigned long, thold_att, sdrt->tCH_min);
1494 thold_att = max_t(unsigned long, thold_att, sdrt->tCLH_min);
1495 thold_att = max_t(unsigned long, thold_att, sdrt->tCOH_min);
1496 thold_att = max_t(unsigned long, thold_att, sdrt->tDH_min);
1497 if ((sdrt->tWB_max + FMC2_TIO + FMC2_TSYNC > tset_mem) &&
1498 (thold_att < sdrt->tWB_max + FMC2_TIO + FMC2_TSYNC - tset_mem))
1499 thold_att = sdrt->tWB_max + FMC2_TIO + FMC2_TSYNC - tset_mem;
1500 if (sdrt->tADL_min > tset_mem &&
1501 (thold_att < sdrt->tADL_min - tset_mem))
1502 thold_att = sdrt->tADL_min - tset_mem;
1503 if (sdrt->tWH_min > tset_mem &&
1504 (thold_att < sdrt->tWH_min - tset_mem))
1505 thold_att = sdrt->tWH_min - tset_mem;
1506 if (sdrt->tWHR_min > tset_mem &&
1507 (thold_att < sdrt->tWHR_min - tset_mem))
1508 thold_att = sdrt->tWHR_min - tset_mem;
1509 if ((sdrt->tRC_min > tset_att + twait) &&
1510 (thold_att < sdrt->tRC_min - (tset_att + twait)))
1511 thold_att = sdrt->tRC_min - (tset_att + twait);
1512 if ((sdrt->tWC_min > tset_att + twait) &&
1513 (thold_att < sdrt->tWC_min - (tset_att + twait)))
1514 thold_att = sdrt->tWC_min - (tset_att + twait);
1515 timing = DIV_ROUND_UP(thold_att, hclkp);
1516 tims->thold_att = clamp_val(timing, 1, FMC2_PMEM_PATT_TIMING_MASK);
1517 }
1518
1519 static int stm32_fmc2_nfc_setup_interface(struct nand_chip *chip, int chipnr,
1520 const struct nand_interface_config *conf)
1521 {
1522 const struct nand_sdr_timings *sdrt;
1523
1524 sdrt = nand_get_sdr_timings(conf);
1525 if (IS_ERR(sdrt))
1526 return PTR_ERR(sdrt);
1527
1528 if (chipnr == NAND_DATA_IFACE_CHECK_ONLY)
1529 return 0;
1530
1531 stm32_fmc2_nfc_calc_timings(chip, sdrt);
1532 stm32_fmc2_nfc_timings_init(chip);
1533
1534 return 0;
1535 }
1536
1537 static int stm32_fmc2_nfc_dma_setup(struct stm32_fmc2_nfc *nfc)
1538 {
1539 int ret = 0;
1540
1541 nfc->dma_tx_ch = dma_request_chan(nfc->dev, "tx");
1542 if (IS_ERR(nfc->dma_tx_ch)) {
1543 ret = PTR_ERR(nfc->dma_tx_ch);
1544 if (ret != -ENODEV && ret != -EPROBE_DEFER)
1545 dev_err(nfc->dev,
1546 "failed to request tx DMA channel: %d\n", ret);
1547 nfc->dma_tx_ch = NULL;
1548 goto err_dma;
1549 }
1550
1551 nfc->dma_rx_ch = dma_request_chan(nfc->dev, "rx");
1552 if (IS_ERR(nfc->dma_rx_ch)) {
1553 ret = PTR_ERR(nfc->dma_rx_ch);
1554 if (ret != -ENODEV && ret != -EPROBE_DEFER)
1555 dev_err(nfc->dev,
1556 "failed to request rx DMA channel: %d\n", ret);
1557 nfc->dma_rx_ch = NULL;
1558 goto err_dma;
1559 }
1560
1561 nfc->dma_ecc_ch = dma_request_chan(nfc->dev, "ecc");
1562 if (IS_ERR(nfc->dma_ecc_ch)) {
1563 ret = PTR_ERR(nfc->dma_ecc_ch);
1564 if (ret != -ENODEV && ret != -EPROBE_DEFER)
1565 dev_err(nfc->dev,
1566 "failed to request ecc DMA channel: %d\n", ret);
1567 nfc->dma_ecc_ch = NULL;
1568 goto err_dma;
1569 }
1570
1571 ret = sg_alloc_table(&nfc->dma_ecc_sg, FMC2_MAX_SG, GFP_KERNEL);
1572 if (ret)
1573 return ret;
1574
1575 /* Allocate a buffer to store ECC status registers */
1576 nfc->ecc_buf = devm_kzalloc(nfc->dev, FMC2_MAX_ECC_BUF_LEN, GFP_KERNEL);
1577 if (!nfc->ecc_buf)
1578 return -ENOMEM;
1579
1580 ret = sg_alloc_table(&nfc->dma_data_sg, FMC2_MAX_SG, GFP_KERNEL);
1581 if (ret)
1582 return ret;
1583
1584 init_completion(&nfc->dma_data_complete);
1585 init_completion(&nfc->dma_ecc_complete);
1586
1587 return 0;
1588
1589 err_dma:
1590 if (ret == -ENODEV) {
1591 dev_warn(nfc->dev,
1592 "DMAs not defined in the DT, polling mode is used\n");
1593 ret = 0;
1594 }
1595
1596 return ret;
1597 }
1598
1599 static void stm32_fmc2_nfc_nand_callbacks_setup(struct nand_chip *chip)
1600 {
1601 struct stm32_fmc2_nfc *nfc = to_stm32_nfc(chip->controller);
1602
1603 /*
1604 * Specific callbacks to read/write a page depending on
1605 * the mode (polling/sequencer) and the algo used (Hamming, BCH).
1606 */
1607 if (nfc->dma_tx_ch && nfc->dma_rx_ch && nfc->dma_ecc_ch) {
1608 /* DMA => use sequencer mode callbacks */
1609 chip->ecc.correct = stm32_fmc2_nfc_seq_correct;
1610 chip->ecc.write_page = stm32_fmc2_nfc_seq_write_page;
1611 chip->ecc.read_page = stm32_fmc2_nfc_seq_read_page;
1612 chip->ecc.write_page_raw = stm32_fmc2_nfc_seq_write_page_raw;
1613 chip->ecc.read_page_raw = stm32_fmc2_nfc_seq_read_page_raw;
1614 } else {
1615 /* No DMA => use polling mode callbacks */
1616 chip->ecc.hwctl = stm32_fmc2_nfc_hwctl;
1617 if (chip->ecc.strength == FMC2_ECC_HAM) {
1618 /* Hamming is used */
1619 chip->ecc.calculate = stm32_fmc2_nfc_ham_calculate;
1620 chip->ecc.correct = stm32_fmc2_nfc_ham_correct;
1621 chip->ecc.options |= NAND_ECC_GENERIC_ERASED_CHECK;
1622 } else {
1623 /* BCH is used */
1624 chip->ecc.calculate = stm32_fmc2_nfc_bch_calculate;
1625 chip->ecc.correct = stm32_fmc2_nfc_bch_correct;
1626 chip->ecc.read_page = stm32_fmc2_nfc_read_page;
1627 }
1628 }
1629
1630 /* Specific configurations depending on the algo used */
1631 if (chip->ecc.strength == FMC2_ECC_HAM)
1632 chip->ecc.bytes = chip->options & NAND_BUSWIDTH_16 ? 4 : 3;
1633 else if (chip->ecc.strength == FMC2_ECC_BCH8)
1634 chip->ecc.bytes = chip->options & NAND_BUSWIDTH_16 ? 14 : 13;
1635 else
1636 chip->ecc.bytes = chip->options & NAND_BUSWIDTH_16 ? 8 : 7;
1637 }
1638
1639 static int stm32_fmc2_nfc_ooblayout_ecc(struct mtd_info *mtd, int section,
1640 struct mtd_oob_region *oobregion)
1641 {
1642 struct nand_chip *chip = mtd_to_nand(mtd);
1643 struct nand_ecc_ctrl *ecc = &chip->ecc;
1644
1645 if (section)
1646 return -ERANGE;
1647
1648 oobregion->length = ecc->total;
1649 oobregion->offset = FMC2_BBM_LEN;
1650
1651 return 0;
1652 }
1653
1654 static int stm32_fmc2_nfc_ooblayout_free(struct mtd_info *mtd, int section,
1655 struct mtd_oob_region *oobregion)
1656 {
1657 struct nand_chip *chip = mtd_to_nand(mtd);
1658 struct nand_ecc_ctrl *ecc = &chip->ecc;
1659
1660 if (section)
1661 return -ERANGE;
1662
1663 oobregion->length = mtd->oobsize - ecc->total - FMC2_BBM_LEN;
1664 oobregion->offset = ecc->total + FMC2_BBM_LEN;
1665
1666 return 0;
1667 }
1668
1669 static const struct mtd_ooblayout_ops stm32_fmc2_nfc_ooblayout_ops = {
1670 .ecc = stm32_fmc2_nfc_ooblayout_ecc,
1671 .free = stm32_fmc2_nfc_ooblayout_free,
1672 };
1673
1674 static int stm32_fmc2_nfc_calc_ecc_bytes(int step_size, int strength)
1675 {
1676 /* Hamming */
1677 if (strength == FMC2_ECC_HAM)
1678 return 4;
1679
1680 /* BCH8 */
1681 if (strength == FMC2_ECC_BCH8)
1682 return 14;
1683
1684 /* BCH4 */
1685 return 8;
1686 }
1687
1688 NAND_ECC_CAPS_SINGLE(stm32_fmc2_nfc_ecc_caps, stm32_fmc2_nfc_calc_ecc_bytes,
1689 FMC2_ECC_STEP_SIZE,
1690 FMC2_ECC_HAM, FMC2_ECC_BCH4, FMC2_ECC_BCH8);
1691
1692 static int stm32_fmc2_nfc_attach_chip(struct nand_chip *chip)
1693 {
1694 struct stm32_fmc2_nfc *nfc = to_stm32_nfc(chip->controller);
1695 struct mtd_info *mtd = nand_to_mtd(chip);
1696 int ret;
1697
1698 /*
1699 * Only NAND_ECC_ENGINE_TYPE_ON_HOST mode is actually supported
1700 * Hamming => ecc.strength = 1
1701 * BCH4 => ecc.strength = 4
1702 * BCH8 => ecc.strength = 8
1703 * ECC sector size = 512
1704 */
1705 if (chip->ecc.engine_type != NAND_ECC_ENGINE_TYPE_ON_HOST) {
1706 dev_err(nfc->dev,
1707 "nand_ecc_engine_type is not well defined in the DT\n");
1708 return -EINVAL;
1709 }
1710
1711 /* Default ECC settings in case they are not set in the device tree */
1712 if (!chip->ecc.size)
1713 chip->ecc.size = FMC2_ECC_STEP_SIZE;
1714
1715 if (!chip->ecc.strength)
1716 chip->ecc.strength = FMC2_ECC_BCH8;
1717
1718 ret = nand_ecc_choose_conf(chip, &stm32_fmc2_nfc_ecc_caps,
1719 mtd->oobsize - FMC2_BBM_LEN);
1720 if (ret) {
1721 dev_err(nfc->dev, "no valid ECC settings set\n");
1722 return ret;
1723 }
1724
1725 if (mtd->writesize / chip->ecc.size > FMC2_MAX_SG) {
1726 dev_err(nfc->dev, "nand page size is not supported\n");
1727 return -EINVAL;
1728 }
1729
1730 if (chip->bbt_options & NAND_BBT_USE_FLASH)
1731 chip->bbt_options |= NAND_BBT_NO_OOB;
1732
1733 stm32_fmc2_nfc_nand_callbacks_setup(chip);
1734
1735 mtd_set_ooblayout(mtd, &stm32_fmc2_nfc_ooblayout_ops);
1736
1737 stm32_fmc2_nfc_setup(chip);
1738
1739 return 0;
1740 }
1741
1742 static const struct nand_controller_ops stm32_fmc2_nfc_controller_ops = {
1743 .attach_chip = stm32_fmc2_nfc_attach_chip,
1744 .exec_op = stm32_fmc2_nfc_exec_op,
1745 .setup_interface = stm32_fmc2_nfc_setup_interface,
1746 };
1747
1748 static int stm32_fmc2_nfc_parse_child(struct stm32_fmc2_nfc *nfc,
1749 struct device_node *dn)
1750 {
1751 struct stm32_fmc2_nand *nand = &nfc->nand;
1752 u32 cs;
1753 int ret, i;
1754
1755 if (!of_get_property(dn, "reg", &nand->ncs))
1756 return -EINVAL;
1757
1758 nand->ncs /= sizeof(u32);
1759 if (!nand->ncs) {
1760 dev_err(nfc->dev, "invalid reg property size\n");
1761 return -EINVAL;
1762 }
1763
1764 for (i = 0; i < nand->ncs; i++) {
1765 ret = of_property_read_u32_index(dn, "reg", i, &cs);
1766 if (ret) {
1767 dev_err(nfc->dev, "could not retrieve reg property: %d\n",
1768 ret);
1769 return ret;
1770 }
1771
1772 if (cs >= FMC2_MAX_CE) {
1773 dev_err(nfc->dev, "invalid reg value: %d\n", cs);
1774 return -EINVAL;
1775 }
1776
1777 if (nfc->cs_assigned & BIT(cs)) {
1778 dev_err(nfc->dev, "cs already assigned: %d\n", cs);
1779 return -EINVAL;
1780 }
1781
1782 nfc->cs_assigned |= BIT(cs);
1783 nand->cs_used[i] = cs;
1784 }
1785
1786 nand_set_flash_node(&nand->chip, dn);
1787
1788 return 0;
1789 }
1790
1791 static int stm32_fmc2_nfc_parse_dt(struct stm32_fmc2_nfc *nfc)
1792 {
1793 struct device_node *dn = nfc->dev->of_node;
1794 struct device_node *child;
1795 int nchips = of_get_child_count(dn);
1796 int ret = 0;
1797
1798 if (!nchips) {
1799 dev_err(nfc->dev, "NAND chip not defined\n");
1800 return -EINVAL;
1801 }
1802
1803 if (nchips > 1) {
1804 dev_err(nfc->dev, "too many NAND chips defined\n");
1805 return -EINVAL;
1806 }
1807
1808 for_each_child_of_node(dn, child) {
1809 ret = stm32_fmc2_nfc_parse_child(nfc, child);
1810 if (ret < 0) {
1811 of_node_put(child);
1812 return ret;
1813 }
1814 }
1815
1816 return ret;
1817 }
1818
1819 static int stm32_fmc2_nfc_set_cdev(struct stm32_fmc2_nfc *nfc)
1820 {
1821 struct device *dev = nfc->dev;
1822 bool ebi_found = false;
1823
1824 if (dev->parent && of_device_is_compatible(dev->parent->of_node,
1825 "st,stm32mp1-fmc2-ebi"))
1826 ebi_found = true;
1827
1828 if (of_device_is_compatible(dev->of_node, "st,stm32mp1-fmc2-nfc")) {
1829 if (ebi_found) {
1830 nfc->cdev = dev->parent;
1831
1832 return 0;
1833 }
1834
1835 return -EINVAL;
1836 }
1837
1838 if (ebi_found)
1839 return -EINVAL;
1840
1841 nfc->cdev = dev;
1842
1843 return 0;
1844 }
1845
1846 static int stm32_fmc2_nfc_probe(struct platform_device *pdev)
1847 {
1848 struct device *dev = &pdev->dev;
1849 struct reset_control *rstc;
1850 struct stm32_fmc2_nfc *nfc;
1851 struct stm32_fmc2_nand *nand;
1852 struct resource *res;
1853 struct mtd_info *mtd;
1854 struct nand_chip *chip;
1855 struct resource cres;
1856 int chip_cs, mem_region, ret, irq;
1857 int start_region = 0;
1858
1859 nfc = devm_kzalloc(dev, sizeof(*nfc), GFP_KERNEL);
1860 if (!nfc)
1861 return -ENOMEM;
1862
1863 nfc->dev = dev;
1864 nand_controller_init(&nfc->base);
1865 nfc->base.ops = &stm32_fmc2_nfc_controller_ops;
1866
1867 ret = stm32_fmc2_nfc_set_cdev(nfc);
1868 if (ret)
1869 return ret;
1870
1871 ret = stm32_fmc2_nfc_parse_dt(nfc);
1872 if (ret)
1873 return ret;
1874
1875 ret = of_address_to_resource(nfc->cdev->of_node, 0, &cres);
1876 if (ret)
1877 return ret;
1878
1879 nfc->io_phys_addr = cres.start;
1880
1881 nfc->regmap = device_node_to_regmap(nfc->cdev->of_node);
1882 if (IS_ERR(nfc->regmap))
1883 return PTR_ERR(nfc->regmap);
1884
1885 if (nfc->dev == nfc->cdev)
1886 start_region = 1;
1887
1888 for (chip_cs = 0, mem_region = start_region; chip_cs < FMC2_MAX_CE;
1889 chip_cs++, mem_region += 3) {
1890 if (!(nfc->cs_assigned & BIT(chip_cs)))
1891 continue;
1892
1893 res = platform_get_resource(pdev, IORESOURCE_MEM, mem_region);
1894 nfc->data_base[chip_cs] = devm_ioremap_resource(dev, res);
1895 if (IS_ERR(nfc->data_base[chip_cs]))
1896 return PTR_ERR(nfc->data_base[chip_cs]);
1897
1898 nfc->data_phys_addr[chip_cs] = res->start;
1899
1900 res = platform_get_resource(pdev, IORESOURCE_MEM,
1901 mem_region + 1);
1902 nfc->cmd_base[chip_cs] = devm_ioremap_resource(dev, res);
1903 if (IS_ERR(nfc->cmd_base[chip_cs]))
1904 return PTR_ERR(nfc->cmd_base[chip_cs]);
1905
1906 res = platform_get_resource(pdev, IORESOURCE_MEM,
1907 mem_region + 2);
1908 nfc->addr_base[chip_cs] = devm_ioremap_resource(dev, res);
1909 if (IS_ERR(nfc->addr_base[chip_cs]))
1910 return PTR_ERR(nfc->addr_base[chip_cs]);
1911 }
1912
1913 irq = platform_get_irq(pdev, 0);
1914 if (irq < 0)
1915 return irq;
1916
1917 ret = devm_request_irq(dev, irq, stm32_fmc2_nfc_irq, 0,
1918 dev_name(dev), nfc);
1919 if (ret) {
1920 dev_err(dev, "failed to request irq\n");
1921 return ret;
1922 }
1923
1924 init_completion(&nfc->complete);
1925
1926 nfc->clk = devm_clk_get(nfc->cdev, NULL);
1927 if (IS_ERR(nfc->clk))
1928 return PTR_ERR(nfc->clk);
1929
1930 ret = clk_prepare_enable(nfc->clk);
1931 if (ret) {
1932 dev_err(dev, "can not enable the clock\n");
1933 return ret;
1934 }
1935
1936 rstc = devm_reset_control_get(dev, NULL);
1937 if (IS_ERR(rstc)) {
1938 ret = PTR_ERR(rstc);
1939 if (ret == -EPROBE_DEFER)
1940 goto err_clk_disable;
1941 } else {
1942 reset_control_assert(rstc);
1943 reset_control_deassert(rstc);
1944 }
1945
1946 ret = stm32_fmc2_nfc_dma_setup(nfc);
1947 if (ret)
1948 goto err_release_dma;
1949
1950 stm32_fmc2_nfc_init(nfc);
1951
1952 nand = &nfc->nand;
1953 chip = &nand->chip;
1954 mtd = nand_to_mtd(chip);
1955 mtd->dev.parent = dev;
1956
1957 chip->controller = &nfc->base;
1958 chip->options |= NAND_BUSWIDTH_AUTO | NAND_NO_SUBPAGE_WRITE |
1959 NAND_USES_DMA;
1960
1961 /* Scan to find existence of the device */
1962 ret = nand_scan(chip, nand->ncs);
1963 if (ret)
1964 goto err_release_dma;
1965
1966 ret = mtd_device_register(mtd, NULL, 0);
1967 if (ret)
1968 goto err_nand_cleanup;
1969
1970 platform_set_drvdata(pdev, nfc);
1971
1972 return 0;
1973
1974 err_nand_cleanup:
1975 nand_cleanup(chip);
1976
1977 err_release_dma:
1978 if (nfc->dma_ecc_ch)
1979 dma_release_channel(nfc->dma_ecc_ch);
1980 if (nfc->dma_tx_ch)
1981 dma_release_channel(nfc->dma_tx_ch);
1982 if (nfc->dma_rx_ch)
1983 dma_release_channel(nfc->dma_rx_ch);
1984
1985 sg_free_table(&nfc->dma_data_sg);
1986 sg_free_table(&nfc->dma_ecc_sg);
1987
1988 err_clk_disable:
1989 clk_disable_unprepare(nfc->clk);
1990
1991 return ret;
1992 }
1993
1994 static int stm32_fmc2_nfc_remove(struct platform_device *pdev)
1995 {
1996 struct stm32_fmc2_nfc *nfc = platform_get_drvdata(pdev);
1997 struct stm32_fmc2_nand *nand = &nfc->nand;
1998 struct nand_chip *chip = &nand->chip;
1999 int ret;
2000
2001 ret = mtd_device_unregister(nand_to_mtd(chip));
2002 WARN_ON(ret);
2003 nand_cleanup(chip);
2004
2005 if (nfc->dma_ecc_ch)
2006 dma_release_channel(nfc->dma_ecc_ch);
2007 if (nfc->dma_tx_ch)
2008 dma_release_channel(nfc->dma_tx_ch);
2009 if (nfc->dma_rx_ch)
2010 dma_release_channel(nfc->dma_rx_ch);
2011
2012 sg_free_table(&nfc->dma_data_sg);
2013 sg_free_table(&nfc->dma_ecc_sg);
2014
2015 clk_disable_unprepare(nfc->clk);
2016
2017 return 0;
2018 }
2019
2020 static int __maybe_unused stm32_fmc2_nfc_suspend(struct device *dev)
2021 {
2022 struct stm32_fmc2_nfc *nfc = dev_get_drvdata(dev);
2023
2024 clk_disable_unprepare(nfc->clk);
2025
2026 pinctrl_pm_select_sleep_state(dev);
2027
2028 return 0;
2029 }
2030
2031 static int __maybe_unused stm32_fmc2_nfc_resume(struct device *dev)
2032 {
2033 struct stm32_fmc2_nfc *nfc = dev_get_drvdata(dev);
2034 struct stm32_fmc2_nand *nand = &nfc->nand;
2035 int chip_cs, ret;
2036
2037 pinctrl_pm_select_default_state(dev);
2038
2039 ret = clk_prepare_enable(nfc->clk);
2040 if (ret) {
2041 dev_err(dev, "can not enable the clock\n");
2042 return ret;
2043 }
2044
2045 stm32_fmc2_nfc_init(nfc);
2046
2047 for (chip_cs = 0; chip_cs < FMC2_MAX_CE; chip_cs++) {
2048 if (!(nfc->cs_assigned & BIT(chip_cs)))
2049 continue;
2050
2051 nand_reset(&nand->chip, chip_cs);
2052 }
2053
2054 return 0;
2055 }
2056
2057 static SIMPLE_DEV_PM_OPS(stm32_fmc2_nfc_pm_ops, stm32_fmc2_nfc_suspend,
2058 stm32_fmc2_nfc_resume);
2059
2060 static const struct of_device_id stm32_fmc2_nfc_match[] = {
2061 {.compatible = "st,stm32mp15-fmc2"},
2062 {.compatible = "st,stm32mp1-fmc2-nfc"},
2063 {}
2064 };
2065 MODULE_DEVICE_TABLE(of, stm32_fmc2_nfc_match);
2066
2067 static struct platform_driver stm32_fmc2_nfc_driver = {
2068 .probe = stm32_fmc2_nfc_probe,
2069 .remove = stm32_fmc2_nfc_remove,
2070 .driver = {
2071 .name = "stm32_fmc2_nfc",
2072 .of_match_table = stm32_fmc2_nfc_match,
2073 .pm = &stm32_fmc2_nfc_pm_ops,
2074 },
2075 };
2076 module_platform_driver(stm32_fmc2_nfc_driver);
2077
2078 MODULE_ALIAS("platform:stm32_fmc2_nfc");
2079 MODULE_AUTHOR("Christophe Kerello <christophe.kerello@st.com>");
2080 MODULE_DESCRIPTION("STMicroelectronics STM32 FMC2 NFC driver");
2081 MODULE_LICENSE("GPL v2");
Linux with added FPC-III support