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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Renesas RPC-IF core driver
4 *
5 * Copyright (C) 2018-2019 Renesas Solutions Corp.
6 * Copyright (C) 2019 Macronix International Co., Ltd.
7 * Copyright (C) 2019-2020 Cogent Embedded, Inc.
8 */
9
10#include <linux/clk.h>
11#include <linux/io.h>
12#include <linux/module.h>
13#include <linux/platform_device.h>
14#include <linux/of.h>
15#include <linux/pm_runtime.h>
16#include <linux/regmap.h>
17#include <linux/reset.h>
18
19#include <memory/renesas-rpc-if.h>
20
21#define RPCIF_CMNCR 0x0000 /* R/W */
22#define RPCIF_CMNCR_MD BIT(31)
23#define RPCIF_CMNCR_SFDE BIT(24) /* undocumented but must be set */
24#define RPCIF_CMNCR_MOIIO3(val) (((val) & 0x3) << 22)
25#define RPCIF_CMNCR_MOIIO2(val) (((val) & 0x3) << 20)
26#define RPCIF_CMNCR_MOIIO1(val) (((val) & 0x3) << 18)
27#define RPCIF_CMNCR_MOIIO0(val) (((val) & 0x3) << 16)
28#define RPCIF_CMNCR_MOIIO_HIZ (RPCIF_CMNCR_MOIIO0(3) | \
29 RPCIF_CMNCR_MOIIO1(3) | \
30 RPCIF_CMNCR_MOIIO2(3) | RPCIF_CMNCR_MOIIO3(3))
31#define RPCIF_CMNCR_IO3FV(val) (((val) & 0x3) << 14) /* undocumented */
32#define RPCIF_CMNCR_IO2FV(val) (((val) & 0x3) << 12) /* undocumented */
33#define RPCIF_CMNCR_IO0FV(val) (((val) & 0x3) << 8)
34#define RPCIF_CMNCR_IOFV_HIZ (RPCIF_CMNCR_IO0FV(3) | RPCIF_CMNCR_IO2FV(3) | \
35 RPCIF_CMNCR_IO3FV(3))
36#define RPCIF_CMNCR_BSZ(val) (((val) & 0x3) << 0)
37
38#define RPCIF_SSLDR 0x0004 /* R/W */
39#define RPCIF_SSLDR_SPNDL(d) (((d) & 0x7) << 16)
40#define RPCIF_SSLDR_SLNDL(d) (((d) & 0x7) << 8)
41#define RPCIF_SSLDR_SCKDL(d) (((d) & 0x7) << 0)
42
43#define RPCIF_DRCR 0x000C /* R/W */
44#define RPCIF_DRCR_SSLN BIT(24)
45#define RPCIF_DRCR_RBURST(v) ((((v) - 1) & 0x1F) << 16)
46#define RPCIF_DRCR_RCF BIT(9)
47#define RPCIF_DRCR_RBE BIT(8)
48#define RPCIF_DRCR_SSLE BIT(0)
49
50#define RPCIF_DRCMR 0x0010 /* R/W */
51#define RPCIF_DRCMR_CMD(c) (((c) & 0xFF) << 16)
52#define RPCIF_DRCMR_OCMD(c) (((c) & 0xFF) << 0)
53
54#define RPCIF_DREAR 0x0014 /* R/W */
55#define RPCIF_DREAR_EAV(c) (((c) & 0xF) << 16)
56#define RPCIF_DREAR_EAC(c) (((c) & 0x7) << 0)
57
58#define RPCIF_DROPR 0x0018 /* R/W */
59
60#define RPCIF_DRENR 0x001C /* R/W */
61#define RPCIF_DRENR_CDB(o) (u32)((((o) & 0x3) << 30))
62#define RPCIF_DRENR_OCDB(o) (((o) & 0x3) << 28)
63#define RPCIF_DRENR_ADB(o) (((o) & 0x3) << 24)
64#define RPCIF_DRENR_OPDB(o) (((o) & 0x3) << 20)
65#define RPCIF_DRENR_DRDB(o) (((o) & 0x3) << 16)
66#define RPCIF_DRENR_DME BIT(15)
67#define RPCIF_DRENR_CDE BIT(14)
68#define RPCIF_DRENR_OCDE BIT(12)
69#define RPCIF_DRENR_ADE(v) (((v) & 0xF) << 8)
70#define RPCIF_DRENR_OPDE(v) (((v) & 0xF) << 4)
71
72#define RPCIF_SMCR 0x0020 /* R/W */
73#define RPCIF_SMCR_SSLKP BIT(8)
74#define RPCIF_SMCR_SPIRE BIT(2)
75#define RPCIF_SMCR_SPIWE BIT(1)
76#define RPCIF_SMCR_SPIE BIT(0)
77
78#define RPCIF_SMCMR 0x0024 /* R/W */
79#define RPCIF_SMCMR_CMD(c) (((c) & 0xFF) << 16)
80#define RPCIF_SMCMR_OCMD(c) (((c) & 0xFF) << 0)
81
82#define RPCIF_SMADR 0x0028 /* R/W */
83
84#define RPCIF_SMOPR 0x002C /* R/W */
85#define RPCIF_SMOPR_OPD3(o) (((o) & 0xFF) << 24)
86#define RPCIF_SMOPR_OPD2(o) (((o) & 0xFF) << 16)
87#define RPCIF_SMOPR_OPD1(o) (((o) & 0xFF) << 8)
88#define RPCIF_SMOPR_OPD0(o) (((o) & 0xFF) << 0)
89
90#define RPCIF_SMENR 0x0030 /* R/W */
91#define RPCIF_SMENR_CDB(o) (((o) & 0x3) << 30)
92#define RPCIF_SMENR_OCDB(o) (((o) & 0x3) << 28)
93#define RPCIF_SMENR_ADB(o) (((o) & 0x3) << 24)
94#define RPCIF_SMENR_OPDB(o) (((o) & 0x3) << 20)
95#define RPCIF_SMENR_SPIDB(o) (((o) & 0x3) << 16)
96#define RPCIF_SMENR_DME BIT(15)
97#define RPCIF_SMENR_CDE BIT(14)
98#define RPCIF_SMENR_OCDE BIT(12)
99#define RPCIF_SMENR_ADE(v) (((v) & 0xF) << 8)
100#define RPCIF_SMENR_OPDE(v) (((v) & 0xF) << 4)
101#define RPCIF_SMENR_SPIDE(v) (((v) & 0xF) << 0)
102
103#define RPCIF_SMRDR0 0x0038 /* R */
104#define RPCIF_SMRDR1 0x003C /* R */
105#define RPCIF_SMWDR0 0x0040 /* W */
106#define RPCIF_SMWDR1 0x0044 /* W */
107
108#define RPCIF_CMNSR 0x0048 /* R */
109#define RPCIF_CMNSR_SSLF BIT(1)
110#define RPCIF_CMNSR_TEND BIT(0)
111
112#define RPCIF_DRDMCR 0x0058 /* R/W */
113#define RPCIF_DMDMCR_DMCYC(v) ((((v) - 1) & 0x1F) << 0)
114
115#define RPCIF_DRDRENR 0x005C /* R/W */
116#define RPCIF_DRDRENR_HYPE(v) (((v) & 0x7) << 12)
117#define RPCIF_DRDRENR_ADDRE BIT(8)
118#define RPCIF_DRDRENR_OPDRE BIT(4)
119#define RPCIF_DRDRENR_DRDRE BIT(0)
120
121#define RPCIF_SMDMCR 0x0060 /* R/W */
122#define RPCIF_SMDMCR_DMCYC(v) ((((v) - 1) & 0x1F) << 0)
123
124#define RPCIF_SMDRENR 0x0064 /* R/W */
125#define RPCIF_SMDRENR_HYPE(v) (((v) & 0x7) << 12)
126#define RPCIF_SMDRENR_ADDRE BIT(8)
127#define RPCIF_SMDRENR_OPDRE BIT(4)
128#define RPCIF_SMDRENR_SPIDRE BIT(0)
129
130#define RPCIF_PHYCNT 0x007C /* R/W */
131#define RPCIF_PHYCNT_CAL BIT(31)
132#define RPCIF_PHYCNT_OCTA(v) (((v) & 0x3) << 22)
133#define RPCIF_PHYCNT_EXDS BIT(21)
134#define RPCIF_PHYCNT_OCT BIT(20)
135#define RPCIF_PHYCNT_DDRCAL BIT(19)
136#define RPCIF_PHYCNT_HS BIT(18)
137#define RPCIF_PHYCNT_STRTIM(v) (((v) & 0x7) << 15)
138#define RPCIF_PHYCNT_WBUF2 BIT(4)
139#define RPCIF_PHYCNT_WBUF BIT(2)
140#define RPCIF_PHYCNT_PHYMEM(v) (((v) & 0x3) << 0)
141
142#define RPCIF_PHYOFFSET1 0x0080 /* R/W */
143#define RPCIF_PHYOFFSET1_DDRTMG(v) (((v) & 0x3) << 28)
144
145#define RPCIF_PHYOFFSET2 0x0084 /* R/W */
146#define RPCIF_PHYOFFSET2_OCTTMG(v) (((v) & 0x7) << 8)
147
148#define RPCIF_PHYINT 0x0088 /* R/W */
149#define RPCIF_PHYINT_WPVAL BIT(1)
150
151#define RPCIF_DIRMAP_SIZE 0x4000000
152
153static const struct regmap_range rpcif_volatile_ranges[] = {
154 regmap_reg_range(RPCIF_SMRDR0, RPCIF_SMRDR1),
155 regmap_reg_range(RPCIF_SMWDR0, RPCIF_SMWDR1),
156 regmap_reg_range(RPCIF_CMNSR, RPCIF_CMNSR),
157};
158
159static const struct regmap_access_table rpcif_volatile_table = {
160 .yes_ranges = rpcif_volatile_ranges,
161 .n_yes_ranges = ARRAY_SIZE(rpcif_volatile_ranges),
162};
163
164static const struct regmap_config rpcif_regmap_config = {
165 .reg_bits = 32,
166 .val_bits = 32,
167 .reg_stride = 4,
168 .fast_io = true,
169 .max_register = RPCIF_PHYINT,
170 .volatile_table = &rpcif_volatile_table,
171};
172
173int rpcif_sw_init(struct rpcif *rpc, struct device *dev)
174{
175 struct platform_device *pdev = to_platform_device(dev);
176 struct resource *res;
177 void __iomem *base;
178
179 rpc->dev = dev;
180
181 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "regs");
182 base = devm_ioremap_resource(&pdev->dev, res);
183 if (IS_ERR(base))
184 return PTR_ERR(base);
185
186 rpc->regmap = devm_regmap_init_mmio(&pdev->dev, base,
187 &rpcif_regmap_config);
188 if (IS_ERR(rpc->regmap)) {
189 dev_err(&pdev->dev,
190 "failed to init regmap for rpcif, error %ld\n",
191 PTR_ERR(rpc->regmap));
192 return PTR_ERR(rpc->regmap);
193 }
194
195 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dirmap");
196 rpc->size = resource_size(res);
197 rpc->dirmap = devm_ioremap_resource(&pdev->dev, res);
198 if (IS_ERR(rpc->dirmap))
199 rpc->dirmap = NULL;
200
201 rpc->rstc = devm_reset_control_get_exclusive(&pdev->dev, NULL);
202 if (IS_ERR(rpc->rstc))
203 return PTR_ERR(rpc->rstc);
204
205 return 0;
206}
207EXPORT_SYMBOL(rpcif_sw_init);
208
209void rpcif_enable_rpm(struct rpcif *rpc)
210{
211 pm_runtime_enable(rpc->dev);
212}
213EXPORT_SYMBOL(rpcif_enable_rpm);
214
215void rpcif_disable_rpm(struct rpcif *rpc)
216{
217 pm_runtime_put_sync(rpc->dev);
218}
219EXPORT_SYMBOL(rpcif_disable_rpm);
220
221void rpcif_hw_init(struct rpcif *rpc, bool hyperflash)
222{
223 u32 dummy;
224
225 pm_runtime_get_sync(rpc->dev);
226
227 /*
228 * NOTE: The 0x260 are undocumented bits, but they must be set.
229 * RPCIF_PHYCNT_STRTIM is strobe timing adjustment bits,
230 * 0x0 : the delay is biggest,
231 * 0x1 : the delay is 2nd biggest,
232 * On H3 ES1.x, the value should be 0, while on others,
233 * the value should be 7.
234 */
235 regmap_write(rpc->regmap, RPCIF_PHYCNT, RPCIF_PHYCNT_STRTIM(7) |
236 RPCIF_PHYCNT_PHYMEM(hyperflash ? 3 : 0) | 0x260);
237
238 /*
239 * NOTE: The 0x1511144 are undocumented bits, but they must be set
240 * for RPCIF_PHYOFFSET1.
241 * The 0x31 are undocumented bits, but they must be set
242 * for RPCIF_PHYOFFSET2.
243 */
244 regmap_write(rpc->regmap, RPCIF_PHYOFFSET1, 0x1511144 |
245 RPCIF_PHYOFFSET1_DDRTMG(3));
246 regmap_write(rpc->regmap, RPCIF_PHYOFFSET2, 0x31 |
247 RPCIF_PHYOFFSET2_OCTTMG(4));
248
249 if (hyperflash)
250 regmap_update_bits(rpc->regmap, RPCIF_PHYINT,
251 RPCIF_PHYINT_WPVAL, 0);
252
253 regmap_write(rpc->regmap, RPCIF_CMNCR, RPCIF_CMNCR_SFDE |
254 RPCIF_CMNCR_MOIIO_HIZ | RPCIF_CMNCR_IOFV_HIZ |
255 RPCIF_CMNCR_BSZ(hyperflash ? 1 : 0));
256 /* Set RCF after BSZ update */
257 regmap_write(rpc->regmap, RPCIF_DRCR, RPCIF_DRCR_RCF);
258 /* Dummy read according to spec */
259 regmap_read(rpc->regmap, RPCIF_DRCR, &dummy);
260 regmap_write(rpc->regmap, RPCIF_SSLDR, RPCIF_SSLDR_SPNDL(7) |
261 RPCIF_SSLDR_SLNDL(7) | RPCIF_SSLDR_SCKDL(7));
262
263 pm_runtime_put(rpc->dev);
264
265 rpc->bus_size = hyperflash ? 2 : 1;
266}
267EXPORT_SYMBOL(rpcif_hw_init);
268
269static int wait_msg_xfer_end(struct rpcif *rpc)
270{
271 u32 sts;
272
273 return regmap_read_poll_timeout(rpc->regmap, RPCIF_CMNSR, sts,
274 sts & RPCIF_CMNSR_TEND, 0,
275 USEC_PER_SEC);
276}
277
278static u8 rpcif_bits_set(struct rpcif *rpc, u32 nbytes)
279{
280 if (rpc->bus_size == 2)
281 nbytes /= 2;
282 nbytes = clamp(nbytes, 1U, 4U);
283 return GENMASK(3, 4 - nbytes);
284}
285
286static u8 rpcif_bit_size(u8 buswidth)
287{
288 return buswidth > 4 ? 2 : ilog2(buswidth);
289}
290
291void rpcif_prepare(struct rpcif *rpc, const struct rpcif_op *op, u64 *offs,
292 size_t *len)
293{
294 rpc->smcr = 0;
295 rpc->smadr = 0;
296 rpc->enable = 0;
297 rpc->command = 0;
298 rpc->option = 0;
299 rpc->dummy = 0;
300 rpc->ddr = 0;
301 rpc->xferlen = 0;
302
303 if (op->cmd.buswidth) {
304 rpc->enable = RPCIF_SMENR_CDE |
305 RPCIF_SMENR_CDB(rpcif_bit_size(op->cmd.buswidth));
306 rpc->command = RPCIF_SMCMR_CMD(op->cmd.opcode);
307 if (op->cmd.ddr)
308 rpc->ddr = RPCIF_SMDRENR_HYPE(0x5);
309 }
310 if (op->ocmd.buswidth) {
311 rpc->enable |= RPCIF_SMENR_OCDE |
312 RPCIF_SMENR_OCDB(rpcif_bit_size(op->ocmd.buswidth));
313 rpc->command |= RPCIF_SMCMR_OCMD(op->ocmd.opcode);
314 }
315
316 if (op->addr.buswidth) {
317 rpc->enable |=
318 RPCIF_SMENR_ADB(rpcif_bit_size(op->addr.buswidth));
319 if (op->addr.nbytes == 4)
320 rpc->enable |= RPCIF_SMENR_ADE(0xF);
321 else
322 rpc->enable |= RPCIF_SMENR_ADE(GENMASK(
323 2, 3 - op->addr.nbytes));
324 if (op->addr.ddr)
325 rpc->ddr |= RPCIF_SMDRENR_ADDRE;
326
327 if (offs && len)
328 rpc->smadr = *offs;
329 else
330 rpc->smadr = op->addr.val;
331 }
332
333 if (op->dummy.buswidth) {
334 rpc->enable |= RPCIF_SMENR_DME;
335 rpc->dummy = RPCIF_SMDMCR_DMCYC(op->dummy.ncycles /
336 op->dummy.buswidth);
337 }
338
339 if (op->option.buswidth) {
340 rpc->enable |= RPCIF_SMENR_OPDE(
341 rpcif_bits_set(rpc, op->option.nbytes)) |
342 RPCIF_SMENR_OPDB(rpcif_bit_size(op->option.buswidth));
343 if (op->option.ddr)
344 rpc->ddr |= RPCIF_SMDRENR_OPDRE;
345 rpc->option = op->option.val;
346 }
347
348 rpc->dir = op->data.dir;
349 if (op->data.buswidth) {
350 u32 nbytes;
351
352 rpc->buffer = op->data.buf.in;
353 switch (op->data.dir) {
354 case RPCIF_DATA_IN:
355 rpc->smcr = RPCIF_SMCR_SPIRE;
356 break;
357 case RPCIF_DATA_OUT:
358 rpc->smcr = RPCIF_SMCR_SPIWE;
359 break;
360 default:
361 break;
362 }
363 if (op->data.ddr)
364 rpc->ddr |= RPCIF_SMDRENR_SPIDRE;
365
366 if (offs && len)
367 nbytes = *len;
368 else
369 nbytes = op->data.nbytes;
370 rpc->xferlen = nbytes;
371
372 rpc->enable |= RPCIF_SMENR_SPIDE(rpcif_bits_set(rpc, nbytes)) |
373 RPCIF_SMENR_SPIDB(rpcif_bit_size(op->data.buswidth));
374 }
375}
376EXPORT_SYMBOL(rpcif_prepare);
377
378int rpcif_manual_xfer(struct rpcif *rpc)
379{
380 u32 smenr, smcr, pos = 0, max = 4;
381 int ret = 0;
382
383 if (rpc->bus_size == 2)
384 max = 8;
385
386 pm_runtime_get_sync(rpc->dev);
387
388 regmap_update_bits(rpc->regmap, RPCIF_PHYCNT,
389 RPCIF_PHYCNT_CAL, RPCIF_PHYCNT_CAL);
390 regmap_update_bits(rpc->regmap, RPCIF_CMNCR,
391 RPCIF_CMNCR_MD, RPCIF_CMNCR_MD);
392 regmap_write(rpc->regmap, RPCIF_SMCMR, rpc->command);
393 regmap_write(rpc->regmap, RPCIF_SMOPR, rpc->option);
394 regmap_write(rpc->regmap, RPCIF_SMDMCR, rpc->dummy);
395 regmap_write(rpc->regmap, RPCIF_SMDRENR, rpc->ddr);
396 smenr = rpc->enable;
397
398 switch (rpc->dir) {
399 case RPCIF_DATA_OUT:
400 while (pos < rpc->xferlen) {
401 u32 nbytes = rpc->xferlen - pos;
402 u32 data[2];
403
404 smcr = rpc->smcr | RPCIF_SMCR_SPIE;
405 if (nbytes > max) {
406 nbytes = max;
407 smcr |= RPCIF_SMCR_SSLKP;
408 }
409
410 memcpy(data, rpc->buffer + pos, nbytes);
411 if (nbytes > 4) {
412 regmap_write(rpc->regmap, RPCIF_SMWDR1,
413 data[0]);
414 regmap_write(rpc->regmap, RPCIF_SMWDR0,
415 data[1]);
416 } else if (nbytes > 2) {
417 regmap_write(rpc->regmap, RPCIF_SMWDR0,
418 data[0]);
419 } else {
420 regmap_write(rpc->regmap, RPCIF_SMWDR0,
421 data[0] << 16);
422 }
423
424 regmap_write(rpc->regmap, RPCIF_SMADR,
425 rpc->smadr + pos);
426 regmap_write(rpc->regmap, RPCIF_SMENR, smenr);
427 regmap_write(rpc->regmap, RPCIF_SMCR, smcr);
428 ret = wait_msg_xfer_end(rpc);
429 if (ret)
430 goto err_out;
431
432 pos += nbytes;
433 smenr = rpc->enable &
434 ~RPCIF_SMENR_CDE & ~RPCIF_SMENR_ADE(0xF);
435 }
436 break;
437 case RPCIF_DATA_IN:
438 /*
439 * RPC-IF spoils the data for the commands without an address
440 * phase (like RDID) in the manual mode, so we'll have to work
441 * around this issue by using the external address space read
442 * mode instead.
443 */
444 if (!(smenr & RPCIF_SMENR_ADE(0xF)) && rpc->dirmap) {
445 u32 dummy;
446
447 regmap_update_bits(rpc->regmap, RPCIF_CMNCR,
448 RPCIF_CMNCR_MD, 0);
449 regmap_write(rpc->regmap, RPCIF_DRCR,
450 RPCIF_DRCR_RBURST(32) | RPCIF_DRCR_RBE);
451 regmap_write(rpc->regmap, RPCIF_DRCMR, rpc->command);
452 regmap_write(rpc->regmap, RPCIF_DREAR,
453 RPCIF_DREAR_EAC(1));
454 regmap_write(rpc->regmap, RPCIF_DROPR, rpc->option);
455 regmap_write(rpc->regmap, RPCIF_DRENR,
456 smenr & ~RPCIF_SMENR_SPIDE(0xF));
457 regmap_write(rpc->regmap, RPCIF_DRDMCR, rpc->dummy);
458 regmap_write(rpc->regmap, RPCIF_DRDRENR, rpc->ddr);
459 memcpy_fromio(rpc->buffer, rpc->dirmap, rpc->xferlen);
460 regmap_write(rpc->regmap, RPCIF_DRCR, RPCIF_DRCR_RCF);
461 /* Dummy read according to spec */
462 regmap_read(rpc->regmap, RPCIF_DRCR, &dummy);
463 break;
464 }
465 while (pos < rpc->xferlen) {
466 u32 nbytes = rpc->xferlen - pos;
467 u32 data[2];
468
469 if (nbytes > max)
470 nbytes = max;
471
472 regmap_write(rpc->regmap, RPCIF_SMADR,
473 rpc->smadr + pos);
474 regmap_write(rpc->regmap, RPCIF_SMENR, smenr);
475 regmap_write(rpc->regmap, RPCIF_SMCR,
476 rpc->smcr | RPCIF_SMCR_SPIE);
477 ret = wait_msg_xfer_end(rpc);
478 if (ret)
479 goto err_out;
480
481 if (nbytes > 4) {
482 regmap_read(rpc->regmap, RPCIF_SMRDR1,
483 &data[0]);
484 regmap_read(rpc->regmap, RPCIF_SMRDR0,
485 &data[1]);
486 } else if (nbytes > 2) {
487 regmap_read(rpc->regmap, RPCIF_SMRDR0,
488 &data[0]);
489 } else {
490 regmap_read(rpc->regmap, RPCIF_SMRDR0,
491 &data[0]);
492 data[0] >>= 16;
493 }
494 memcpy(rpc->buffer + pos, data, nbytes);
495
496 pos += nbytes;
497 }
498 break;
499 default:
500 regmap_write(rpc->regmap, RPCIF_SMENR, rpc->enable);
501 regmap_write(rpc->regmap, RPCIF_SMCR,
502 rpc->smcr | RPCIF_SMCR_SPIE);
503 ret = wait_msg_xfer_end(rpc);
504 if (ret)
505 goto err_out;
506 }
507
508exit:
509 pm_runtime_put(rpc->dev);
510 return ret;
511
512err_out:
513 ret = reset_control_reset(rpc->rstc);
514 rpcif_hw_init(rpc, rpc->bus_size == 2);
515 goto exit;
516}
517EXPORT_SYMBOL(rpcif_manual_xfer);
518
519ssize_t rpcif_dirmap_read(struct rpcif *rpc, u64 offs, size_t len, void *buf)
520{
521 loff_t from = offs & (RPCIF_DIRMAP_SIZE - 1);
522 size_t size = RPCIF_DIRMAP_SIZE - from;
523
524 if (len > size)
525 len = size;
526
527 pm_runtime_get_sync(rpc->dev);
528
529 regmap_update_bits(rpc->regmap, RPCIF_CMNCR, RPCIF_CMNCR_MD, 0);
530 regmap_write(rpc->regmap, RPCIF_DRCR, 0);
531 regmap_write(rpc->regmap, RPCIF_DRCMR, rpc->command);
532 regmap_write(rpc->regmap, RPCIF_DREAR,
533 RPCIF_DREAR_EAV(offs >> 25) | RPCIF_DREAR_EAC(1));
534 regmap_write(rpc->regmap, RPCIF_DROPR, rpc->option);
535 regmap_write(rpc->regmap, RPCIF_DRENR,
536 rpc->enable & ~RPCIF_SMENR_SPIDE(0xF));
537 regmap_write(rpc->regmap, RPCIF_DRDMCR, rpc->dummy);
538 regmap_write(rpc->regmap, RPCIF_DRDRENR, rpc->ddr);
539
540 memcpy_fromio(buf, rpc->dirmap + from, len);
541
542 pm_runtime_put(rpc->dev);
543
544 return len;
545}
546EXPORT_SYMBOL(rpcif_dirmap_read);
547
548static int rpcif_probe(struct platform_device *pdev)
549{
550 struct platform_device *vdev;
551 struct device_node *flash;
552 const char *name;
553
554 flash = of_get_next_child(pdev->dev.of_node, NULL);
555 if (!flash) {
556 dev_warn(&pdev->dev, "no flash node found\n");
557 return -ENODEV;
558 }
559
560 if (of_device_is_compatible(flash, "jedec,spi-nor")) {
561 name = "rpc-if-spi";
562 } else if (of_device_is_compatible(flash, "cfi-flash")) {
563 name = "rpc-if-hyperflash";
564 } else {
565 dev_warn(&pdev->dev, "unknown flash type\n");
566 return -ENODEV;
567 }
568
569 vdev = platform_device_alloc(name, pdev->id);
570 if (!vdev)
571 return -ENOMEM;
572 vdev->dev.parent = &pdev->dev;
573 platform_set_drvdata(pdev, vdev);
574 return platform_device_add(vdev);
575}
576
577static int rpcif_remove(struct platform_device *pdev)
578{
579 struct platform_device *vdev = platform_get_drvdata(pdev);
580
581 platform_device_unregister(vdev);
582
583 return 0;
584}
585
586static const struct of_device_id rpcif_of_match[] = {
587 { .compatible = "renesas,rcar-gen3-rpc-if", },
588 {},
589};
590MODULE_DEVICE_TABLE(of, rpcif_of_match);
591
592static struct platform_driver rpcif_driver = {
593 .probe = rpcif_probe,
594 .remove = rpcif_remove,
595 .driver = {
596 .name = "rpc-if",
597 .of_match_table = rpcif_of_match,
598 },
599};
600module_platform_driver(rpcif_driver);
601
602MODULE_DESCRIPTION("Renesas RPC-IF core driver");
603MODULE_LICENSE("GPL v2");
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Renesas RPC-IF core driver
4 *
5 * Copyright (C) 2018-2019 Renesas Solutions Corp.
6 * Copyright (C) 2019 Macronix International Co., Ltd.
7 * Copyright (C) 2019-2020 Cogent Embedded, Inc.
8 */
9
10#include <linux/clk.h>
11#include <linux/io.h>
12#include <linux/module.h>
13#include <linux/platform_device.h>
14#include <linux/of.h>
15#include <linux/regmap.h>
16#include <linux/reset.h>
17
18#include <memory/renesas-rpc-if.h>
19
20#define RPCIF_CMNCR 0x0000 /* R/W */
21#define RPCIF_CMNCR_MD BIT(31)
22#define RPCIF_CMNCR_SFDE BIT(24) /* undocumented but must be set */
23#define RPCIF_CMNCR_MOIIO3(val) (((val) & 0x3) << 22)
24#define RPCIF_CMNCR_MOIIO2(val) (((val) & 0x3) << 20)
25#define RPCIF_CMNCR_MOIIO1(val) (((val) & 0x3) << 18)
26#define RPCIF_CMNCR_MOIIO0(val) (((val) & 0x3) << 16)
27#define RPCIF_CMNCR_MOIIO_HIZ (RPCIF_CMNCR_MOIIO0(3) | \
28 RPCIF_CMNCR_MOIIO1(3) | \
29 RPCIF_CMNCR_MOIIO2(3) | RPCIF_CMNCR_MOIIO3(3))
30#define RPCIF_CMNCR_IO3FV(val) (((val) & 0x3) << 14) /* undocumented */
31#define RPCIF_CMNCR_IO2FV(val) (((val) & 0x3) << 12) /* undocumented */
32#define RPCIF_CMNCR_IO0FV(val) (((val) & 0x3) << 8)
33#define RPCIF_CMNCR_IOFV_HIZ (RPCIF_CMNCR_IO0FV(3) | RPCIF_CMNCR_IO2FV(3) | \
34 RPCIF_CMNCR_IO3FV(3))
35#define RPCIF_CMNCR_BSZ(val) (((val) & 0x3) << 0)
36
37#define RPCIF_SSLDR 0x0004 /* R/W */
38#define RPCIF_SSLDR_SPNDL(d) (((d) & 0x7) << 16)
39#define RPCIF_SSLDR_SLNDL(d) (((d) & 0x7) << 8)
40#define RPCIF_SSLDR_SCKDL(d) (((d) & 0x7) << 0)
41
42#define RPCIF_DRCR 0x000C /* R/W */
43#define RPCIF_DRCR_SSLN BIT(24)
44#define RPCIF_DRCR_RBURST(v) ((((v) - 1) & 0x1F) << 16)
45#define RPCIF_DRCR_RCF BIT(9)
46#define RPCIF_DRCR_RBE BIT(8)
47#define RPCIF_DRCR_SSLE BIT(0)
48
49#define RPCIF_DRCMR 0x0010 /* R/W */
50#define RPCIF_DRCMR_CMD(c) (((c) & 0xFF) << 16)
51#define RPCIF_DRCMR_OCMD(c) (((c) & 0xFF) << 0)
52
53#define RPCIF_DREAR 0x0014 /* R/W */
54#define RPCIF_DREAR_EAV(c) (((c) & 0xF) << 16)
55#define RPCIF_DREAR_EAC(c) (((c) & 0x7) << 0)
56
57#define RPCIF_DROPR 0x0018 /* R/W */
58
59#define RPCIF_DRENR 0x001C /* R/W */
60#define RPCIF_DRENR_CDB(o) (u32)((((o) & 0x3) << 30))
61#define RPCIF_DRENR_OCDB(o) (((o) & 0x3) << 28)
62#define RPCIF_DRENR_ADB(o) (((o) & 0x3) << 24)
63#define RPCIF_DRENR_OPDB(o) (((o) & 0x3) << 20)
64#define RPCIF_DRENR_DRDB(o) (((o) & 0x3) << 16)
65#define RPCIF_DRENR_DME BIT(15)
66#define RPCIF_DRENR_CDE BIT(14)
67#define RPCIF_DRENR_OCDE BIT(12)
68#define RPCIF_DRENR_ADE(v) (((v) & 0xF) << 8)
69#define RPCIF_DRENR_OPDE(v) (((v) & 0xF) << 4)
70
71#define RPCIF_SMCR 0x0020 /* R/W */
72#define RPCIF_SMCR_SSLKP BIT(8)
73#define RPCIF_SMCR_SPIRE BIT(2)
74#define RPCIF_SMCR_SPIWE BIT(1)
75#define RPCIF_SMCR_SPIE BIT(0)
76
77#define RPCIF_SMCMR 0x0024 /* R/W */
78#define RPCIF_SMCMR_CMD(c) (((c) & 0xFF) << 16)
79#define RPCIF_SMCMR_OCMD(c) (((c) & 0xFF) << 0)
80
81#define RPCIF_SMADR 0x0028 /* R/W */
82
83#define RPCIF_SMOPR 0x002C /* R/W */
84#define RPCIF_SMOPR_OPD3(o) (((o) & 0xFF) << 24)
85#define RPCIF_SMOPR_OPD2(o) (((o) & 0xFF) << 16)
86#define RPCIF_SMOPR_OPD1(o) (((o) & 0xFF) << 8)
87#define RPCIF_SMOPR_OPD0(o) (((o) & 0xFF) << 0)
88
89#define RPCIF_SMENR 0x0030 /* R/W */
90#define RPCIF_SMENR_CDB(o) (((o) & 0x3) << 30)
91#define RPCIF_SMENR_OCDB(o) (((o) & 0x3) << 28)
92#define RPCIF_SMENR_ADB(o) (((o) & 0x3) << 24)
93#define RPCIF_SMENR_OPDB(o) (((o) & 0x3) << 20)
94#define RPCIF_SMENR_SPIDB(o) (((o) & 0x3) << 16)
95#define RPCIF_SMENR_DME BIT(15)
96#define RPCIF_SMENR_CDE BIT(14)
97#define RPCIF_SMENR_OCDE BIT(12)
98#define RPCIF_SMENR_ADE(v) (((v) & 0xF) << 8)
99#define RPCIF_SMENR_OPDE(v) (((v) & 0xF) << 4)
100#define RPCIF_SMENR_SPIDE(v) (((v) & 0xF) << 0)
101
102#define RPCIF_SMRDR0 0x0038 /* R */
103#define RPCIF_SMRDR1 0x003C /* R */
104#define RPCIF_SMWDR0 0x0040 /* W */
105#define RPCIF_SMWDR1 0x0044 /* W */
106
107#define RPCIF_CMNSR 0x0048 /* R */
108#define RPCIF_CMNSR_SSLF BIT(1)
109#define RPCIF_CMNSR_TEND BIT(0)
110
111#define RPCIF_DRDMCR 0x0058 /* R/W */
112#define RPCIF_DMDMCR_DMCYC(v) ((((v) - 1) & 0x1F) << 0)
113
114#define RPCIF_DRDRENR 0x005C /* R/W */
115#define RPCIF_DRDRENR_HYPE(v) (((v) & 0x7) << 12)
116#define RPCIF_DRDRENR_ADDRE BIT(8)
117#define RPCIF_DRDRENR_OPDRE BIT(4)
118#define RPCIF_DRDRENR_DRDRE BIT(0)
119
120#define RPCIF_SMDMCR 0x0060 /* R/W */
121#define RPCIF_SMDMCR_DMCYC(v) ((((v) - 1) & 0x1F) << 0)
122
123#define RPCIF_SMDRENR 0x0064 /* R/W */
124#define RPCIF_SMDRENR_HYPE(v) (((v) & 0x7) << 12)
125#define RPCIF_SMDRENR_ADDRE BIT(8)
126#define RPCIF_SMDRENR_OPDRE BIT(4)
127#define RPCIF_SMDRENR_SPIDRE BIT(0)
128
129#define RPCIF_PHYCNT 0x007C /* R/W */
130#define RPCIF_PHYCNT_CAL BIT(31)
131#define RPCIF_PHYCNT_OCTA(v) (((v) & 0x3) << 22)
132#define RPCIF_PHYCNT_EXDS BIT(21)
133#define RPCIF_PHYCNT_OCT BIT(20)
134#define RPCIF_PHYCNT_DDRCAL BIT(19)
135#define RPCIF_PHYCNT_HS BIT(18)
136#define RPCIF_PHYCNT_STRTIM(v) (((v) & 0x7) << 15)
137#define RPCIF_PHYCNT_WBUF2 BIT(4)
138#define RPCIF_PHYCNT_WBUF BIT(2)
139#define RPCIF_PHYCNT_PHYMEM(v) (((v) & 0x3) << 0)
140
141#define RPCIF_PHYOFFSET1 0x0080 /* R/W */
142#define RPCIF_PHYOFFSET1_DDRTMG(v) (((v) & 0x3) << 28)
143
144#define RPCIF_PHYOFFSET2 0x0084 /* R/W */
145#define RPCIF_PHYOFFSET2_OCTTMG(v) (((v) & 0x7) << 8)
146
147#define RPCIF_PHYINT 0x0088 /* R/W */
148#define RPCIF_PHYINT_WPVAL BIT(1)
149
150#define RPCIF_DIRMAP_SIZE 0x4000000
151
152static const struct regmap_range rpcif_volatile_ranges[] = {
153 regmap_reg_range(RPCIF_SMRDR0, RPCIF_SMRDR1),
154 regmap_reg_range(RPCIF_SMWDR0, RPCIF_SMWDR1),
155 regmap_reg_range(RPCIF_CMNSR, RPCIF_CMNSR),
156};
157
158static const struct regmap_access_table rpcif_volatile_table = {
159 .yes_ranges = rpcif_volatile_ranges,
160 .n_yes_ranges = ARRAY_SIZE(rpcif_volatile_ranges),
161};
162
163static const struct regmap_config rpcif_regmap_config = {
164 .reg_bits = 32,
165 .val_bits = 32,
166 .reg_stride = 4,
167 .fast_io = true,
168 .max_register = RPCIF_PHYINT,
169 .volatile_table = &rpcif_volatile_table,
170};
171
172int rpcif_sw_init(struct rpcif *rpc, struct device *dev)
173{
174 struct platform_device *pdev = to_platform_device(dev);
175 struct resource *res;
176 void __iomem *base;
177
178 rpc->dev = dev;
179
180 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "regs");
181 base = devm_ioremap_resource(&pdev->dev, res);
182 if (IS_ERR(base))
183 return PTR_ERR(base);
184
185 rpc->regmap = devm_regmap_init_mmio(&pdev->dev, base,
186 &rpcif_regmap_config);
187 if (IS_ERR(rpc->regmap)) {
188 dev_err(&pdev->dev,
189 "failed to init regmap for rpcif, error %ld\n",
190 PTR_ERR(rpc->regmap));
191 return PTR_ERR(rpc->regmap);
192 }
193
194 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dirmap");
195 rpc->dirmap = devm_ioremap_resource(&pdev->dev, res);
196 if (IS_ERR(rpc->dirmap))
197 rpc->dirmap = NULL;
198 rpc->size = resource_size(res);
199
200 rpc->rstc = devm_reset_control_get_exclusive(&pdev->dev, NULL);
201
202 return PTR_ERR_OR_ZERO(rpc->rstc);
203}
204EXPORT_SYMBOL(rpcif_sw_init);
205
206void rpcif_hw_init(struct rpcif *rpc, bool hyperflash)
207{
208 u32 dummy;
209
210 pm_runtime_get_sync(rpc->dev);
211
212 /*
213 * NOTE: The 0x260 are undocumented bits, but they must be set.
214 * RPCIF_PHYCNT_STRTIM is strobe timing adjustment bits,
215 * 0x0 : the delay is biggest,
216 * 0x1 : the delay is 2nd biggest,
217 * On H3 ES1.x, the value should be 0, while on others,
218 * the value should be 7.
219 */
220 regmap_write(rpc->regmap, RPCIF_PHYCNT, RPCIF_PHYCNT_STRTIM(7) |
221 RPCIF_PHYCNT_PHYMEM(hyperflash ? 3 : 0) | 0x260);
222
223 /*
224 * NOTE: The 0x1511144 are undocumented bits, but they must be set
225 * for RPCIF_PHYOFFSET1.
226 * The 0x31 are undocumented bits, but they must be set
227 * for RPCIF_PHYOFFSET2.
228 */
229 regmap_write(rpc->regmap, RPCIF_PHYOFFSET1, 0x1511144 |
230 RPCIF_PHYOFFSET1_DDRTMG(3));
231 regmap_write(rpc->regmap, RPCIF_PHYOFFSET2, 0x31 |
232 RPCIF_PHYOFFSET2_OCTTMG(4));
233
234 if (hyperflash)
235 regmap_update_bits(rpc->regmap, RPCIF_PHYINT,
236 RPCIF_PHYINT_WPVAL, 0);
237
238 regmap_write(rpc->regmap, RPCIF_CMNCR, RPCIF_CMNCR_SFDE |
239 RPCIF_CMNCR_MOIIO_HIZ | RPCIF_CMNCR_IOFV_HIZ |
240 RPCIF_CMNCR_BSZ(hyperflash ? 1 : 0));
241 /* Set RCF after BSZ update */
242 regmap_write(rpc->regmap, RPCIF_DRCR, RPCIF_DRCR_RCF);
243 /* Dummy read according to spec */
244 regmap_read(rpc->regmap, RPCIF_DRCR, &dummy);
245 regmap_write(rpc->regmap, RPCIF_SSLDR, RPCIF_SSLDR_SPNDL(7) |
246 RPCIF_SSLDR_SLNDL(7) | RPCIF_SSLDR_SCKDL(7));
247
248 pm_runtime_put(rpc->dev);
249
250 rpc->bus_size = hyperflash ? 2 : 1;
251}
252EXPORT_SYMBOL(rpcif_hw_init);
253
254static int wait_msg_xfer_end(struct rpcif *rpc)
255{
256 u32 sts;
257
258 return regmap_read_poll_timeout(rpc->regmap, RPCIF_CMNSR, sts,
259 sts & RPCIF_CMNSR_TEND, 0,
260 USEC_PER_SEC);
261}
262
263static u8 rpcif_bits_set(struct rpcif *rpc, u32 nbytes)
264{
265 if (rpc->bus_size == 2)
266 nbytes /= 2;
267 nbytes = clamp(nbytes, 1U, 4U);
268 return GENMASK(3, 4 - nbytes);
269}
270
271static u8 rpcif_bit_size(u8 buswidth)
272{
273 return buswidth > 4 ? 2 : ilog2(buswidth);
274}
275
276void rpcif_prepare(struct rpcif *rpc, const struct rpcif_op *op, u64 *offs,
277 size_t *len)
278{
279 rpc->smcr = 0;
280 rpc->smadr = 0;
281 rpc->enable = 0;
282 rpc->command = 0;
283 rpc->option = 0;
284 rpc->dummy = 0;
285 rpc->ddr = 0;
286 rpc->xferlen = 0;
287
288 if (op->cmd.buswidth) {
289 rpc->enable = RPCIF_SMENR_CDE |
290 RPCIF_SMENR_CDB(rpcif_bit_size(op->cmd.buswidth));
291 rpc->command = RPCIF_SMCMR_CMD(op->cmd.opcode);
292 if (op->cmd.ddr)
293 rpc->ddr = RPCIF_SMDRENR_HYPE(0x5);
294 }
295 if (op->ocmd.buswidth) {
296 rpc->enable |= RPCIF_SMENR_OCDE |
297 RPCIF_SMENR_OCDB(rpcif_bit_size(op->ocmd.buswidth));
298 rpc->command |= RPCIF_SMCMR_OCMD(op->ocmd.opcode);
299 }
300
301 if (op->addr.buswidth) {
302 rpc->enable |=
303 RPCIF_SMENR_ADB(rpcif_bit_size(op->addr.buswidth));
304 if (op->addr.nbytes == 4)
305 rpc->enable |= RPCIF_SMENR_ADE(0xF);
306 else
307 rpc->enable |= RPCIF_SMENR_ADE(GENMASK(
308 2, 3 - op->addr.nbytes));
309 if (op->addr.ddr)
310 rpc->ddr |= RPCIF_SMDRENR_ADDRE;
311
312 if (offs && len)
313 rpc->smadr = *offs;
314 else
315 rpc->smadr = op->addr.val;
316 }
317
318 if (op->dummy.buswidth) {
319 rpc->enable |= RPCIF_SMENR_DME;
320 rpc->dummy = RPCIF_SMDMCR_DMCYC(op->dummy.ncycles /
321 op->dummy.buswidth);
322 }
323
324 if (op->option.buswidth) {
325 rpc->enable |= RPCIF_SMENR_OPDE(
326 rpcif_bits_set(rpc, op->option.nbytes)) |
327 RPCIF_SMENR_OPDB(rpcif_bit_size(op->option.buswidth));
328 if (op->option.ddr)
329 rpc->ddr |= RPCIF_SMDRENR_OPDRE;
330 rpc->option = op->option.val;
331 }
332
333 rpc->dir = op->data.dir;
334 if (op->data.buswidth) {
335 u32 nbytes;
336
337 rpc->buffer = op->data.buf.in;
338 switch (op->data.dir) {
339 case RPCIF_DATA_IN:
340 rpc->smcr = RPCIF_SMCR_SPIRE;
341 break;
342 case RPCIF_DATA_OUT:
343 rpc->smcr = RPCIF_SMCR_SPIWE;
344 break;
345 default:
346 break;
347 }
348 if (op->data.ddr)
349 rpc->ddr |= RPCIF_SMDRENR_SPIDRE;
350
351 if (offs && len)
352 nbytes = *len;
353 else
354 nbytes = op->data.nbytes;
355 rpc->xferlen = nbytes;
356
357 rpc->enable |= RPCIF_SMENR_SPIDE(rpcif_bits_set(rpc, nbytes)) |
358 RPCIF_SMENR_SPIDB(rpcif_bit_size(op->data.buswidth));
359 }
360}
361EXPORT_SYMBOL(rpcif_prepare);
362
363int rpcif_manual_xfer(struct rpcif *rpc)
364{
365 u32 smenr, smcr, pos = 0, max = 4;
366 int ret = 0;
367
368 if (rpc->bus_size == 2)
369 max = 8;
370
371 pm_runtime_get_sync(rpc->dev);
372
373 regmap_update_bits(rpc->regmap, RPCIF_PHYCNT,
374 RPCIF_PHYCNT_CAL, RPCIF_PHYCNT_CAL);
375 regmap_update_bits(rpc->regmap, RPCIF_CMNCR,
376 RPCIF_CMNCR_MD, RPCIF_CMNCR_MD);
377 regmap_write(rpc->regmap, RPCIF_SMCMR, rpc->command);
378 regmap_write(rpc->regmap, RPCIF_SMOPR, rpc->option);
379 regmap_write(rpc->regmap, RPCIF_SMDMCR, rpc->dummy);
380 regmap_write(rpc->regmap, RPCIF_SMDRENR, rpc->ddr);
381 smenr = rpc->enable;
382
383 switch (rpc->dir) {
384 case RPCIF_DATA_OUT:
385 while (pos < rpc->xferlen) {
386 u32 nbytes = rpc->xferlen - pos;
387 u32 data[2];
388
389 smcr = rpc->smcr | RPCIF_SMCR_SPIE;
390 if (nbytes > max) {
391 nbytes = max;
392 smcr |= RPCIF_SMCR_SSLKP;
393 }
394
395 memcpy(data, rpc->buffer + pos, nbytes);
396 if (nbytes > 4) {
397 regmap_write(rpc->regmap, RPCIF_SMWDR1,
398 data[0]);
399 regmap_write(rpc->regmap, RPCIF_SMWDR0,
400 data[1]);
401 } else if (nbytes > 2) {
402 regmap_write(rpc->regmap, RPCIF_SMWDR0,
403 data[0]);
404 } else {
405 regmap_write(rpc->regmap, RPCIF_SMWDR0,
406 data[0] << 16);
407 }
408
409 regmap_write(rpc->regmap, RPCIF_SMADR,
410 rpc->smadr + pos);
411 regmap_write(rpc->regmap, RPCIF_SMENR, smenr);
412 regmap_write(rpc->regmap, RPCIF_SMCR, smcr);
413 ret = wait_msg_xfer_end(rpc);
414 if (ret)
415 goto err_out;
416
417 pos += nbytes;
418 smenr = rpc->enable &
419 ~RPCIF_SMENR_CDE & ~RPCIF_SMENR_ADE(0xF);
420 }
421 break;
422 case RPCIF_DATA_IN:
423 /*
424 * RPC-IF spoils the data for the commands without an address
425 * phase (like RDID) in the manual mode, so we'll have to work
426 * around this issue by using the external address space read
427 * mode instead.
428 */
429 if (!(smenr & RPCIF_SMENR_ADE(0xF)) && rpc->dirmap) {
430 u32 dummy;
431
432 regmap_update_bits(rpc->regmap, RPCIF_CMNCR,
433 RPCIF_CMNCR_MD, 0);
434 regmap_write(rpc->regmap, RPCIF_DRCR,
435 RPCIF_DRCR_RBURST(32) | RPCIF_DRCR_RBE);
436 regmap_write(rpc->regmap, RPCIF_DRCMR, rpc->command);
437 regmap_write(rpc->regmap, RPCIF_DREAR,
438 RPCIF_DREAR_EAC(1));
439 regmap_write(rpc->regmap, RPCIF_DROPR, rpc->option);
440 regmap_write(rpc->regmap, RPCIF_DRENR,
441 smenr & ~RPCIF_SMENR_SPIDE(0xF));
442 regmap_write(rpc->regmap, RPCIF_DRDMCR, rpc->dummy);
443 regmap_write(rpc->regmap, RPCIF_DRDRENR, rpc->ddr);
444 memcpy_fromio(rpc->buffer, rpc->dirmap, rpc->xferlen);
445 regmap_write(rpc->regmap, RPCIF_DRCR, RPCIF_DRCR_RCF);
446 /* Dummy read according to spec */
447 regmap_read(rpc->regmap, RPCIF_DRCR, &dummy);
448 break;
449 }
450 while (pos < rpc->xferlen) {
451 u32 nbytes = rpc->xferlen - pos;
452 u32 data[2];
453
454 if (nbytes > max)
455 nbytes = max;
456
457 regmap_write(rpc->regmap, RPCIF_SMADR,
458 rpc->smadr + pos);
459 regmap_write(rpc->regmap, RPCIF_SMENR, smenr);
460 regmap_write(rpc->regmap, RPCIF_SMCR,
461 rpc->smcr | RPCIF_SMCR_SPIE);
462 ret = wait_msg_xfer_end(rpc);
463 if (ret)
464 goto err_out;
465
466 if (nbytes > 4) {
467 regmap_read(rpc->regmap, RPCIF_SMRDR1,
468 &data[0]);
469 regmap_read(rpc->regmap, RPCIF_SMRDR0,
470 &data[1]);
471 } else if (nbytes > 2) {
472 regmap_read(rpc->regmap, RPCIF_SMRDR0,
473 &data[0]);
474 } else {
475 regmap_read(rpc->regmap, RPCIF_SMRDR0,
476 &data[0]);
477 data[0] >>= 16;
478 }
479 memcpy(rpc->buffer + pos, data, nbytes);
480
481 pos += nbytes;
482 }
483 break;
484 default:
485 regmap_write(rpc->regmap, RPCIF_SMENR, rpc->enable);
486 regmap_write(rpc->regmap, RPCIF_SMCR,
487 rpc->smcr | RPCIF_SMCR_SPIE);
488 ret = wait_msg_xfer_end(rpc);
489 if (ret)
490 goto err_out;
491 }
492
493exit:
494 pm_runtime_put(rpc->dev);
495 return ret;
496
497err_out:
498 if (reset_control_reset(rpc->rstc))
499 dev_err(rpc->dev, "Failed to reset HW\n");
500 rpcif_hw_init(rpc, rpc->bus_size == 2);
501 goto exit;
502}
503EXPORT_SYMBOL(rpcif_manual_xfer);
504
505ssize_t rpcif_dirmap_read(struct rpcif *rpc, u64 offs, size_t len, void *buf)
506{
507 loff_t from = offs & (RPCIF_DIRMAP_SIZE - 1);
508 size_t size = RPCIF_DIRMAP_SIZE - from;
509
510 if (len > size)
511 len = size;
512
513 pm_runtime_get_sync(rpc->dev);
514
515 regmap_update_bits(rpc->regmap, RPCIF_CMNCR, RPCIF_CMNCR_MD, 0);
516 regmap_write(rpc->regmap, RPCIF_DRCR, 0);
517 regmap_write(rpc->regmap, RPCIF_DRCMR, rpc->command);
518 regmap_write(rpc->regmap, RPCIF_DREAR,
519 RPCIF_DREAR_EAV(offs >> 25) | RPCIF_DREAR_EAC(1));
520 regmap_write(rpc->regmap, RPCIF_DROPR, rpc->option);
521 regmap_write(rpc->regmap, RPCIF_DRENR,
522 rpc->enable & ~RPCIF_SMENR_SPIDE(0xF));
523 regmap_write(rpc->regmap, RPCIF_DRDMCR, rpc->dummy);
524 regmap_write(rpc->regmap, RPCIF_DRDRENR, rpc->ddr);
525
526 memcpy_fromio(buf, rpc->dirmap + from, len);
527
528 pm_runtime_put(rpc->dev);
529
530 return len;
531}
532EXPORT_SYMBOL(rpcif_dirmap_read);
533
534static int rpcif_probe(struct platform_device *pdev)
535{
536 struct platform_device *vdev;
537 struct device_node *flash;
538 const char *name;
539
540 flash = of_get_next_child(pdev->dev.of_node, NULL);
541 if (!flash) {
542 dev_warn(&pdev->dev, "no flash node found\n");
543 return -ENODEV;
544 }
545
546 if (of_device_is_compatible(flash, "jedec,spi-nor")) {
547 name = "rpc-if-spi";
548 } else if (of_device_is_compatible(flash, "cfi-flash")) {
549 name = "rpc-if-hyperflash";
550 } else {
551 of_node_put(flash);
552 dev_warn(&pdev->dev, "unknown flash type\n");
553 return -ENODEV;
554 }
555 of_node_put(flash);
556
557 vdev = platform_device_alloc(name, pdev->id);
558 if (!vdev)
559 return -ENOMEM;
560 vdev->dev.parent = &pdev->dev;
561 platform_set_drvdata(pdev, vdev);
562 return platform_device_add(vdev);
563}
564
565static int rpcif_remove(struct platform_device *pdev)
566{
567 struct platform_device *vdev = platform_get_drvdata(pdev);
568
569 platform_device_unregister(vdev);
570
571 return 0;
572}
573
574static const struct of_device_id rpcif_of_match[] = {
575 { .compatible = "renesas,rcar-gen3-rpc-if", },
576 {},
577};
578MODULE_DEVICE_TABLE(of, rpcif_of_match);
579
580static struct platform_driver rpcif_driver = {
581 .probe = rpcif_probe,
582 .remove = rpcif_remove,
583 .driver = {
584 .name = "rpc-if",
585 .of_match_table = rpcif_of_match,
586 },
587};
588module_platform_driver(rpcif_driver);
589
590MODULE_DESCRIPTION("Renesas RPC-IF core driver");
591MODULE_LICENSE("GPL v2");