1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * SD/MMC Greybus driver.
4 *
5 * Copyright 2014-2015 Google Inc.
6 * Copyright 2014-2015 Linaro Ltd.
7 */
8
9 #include <linux/kernel.h>
10 #include <linux/mmc/core.h>
11 #include <linux/mmc/host.h>
12 #include <linux/mmc/mmc.h>
13 #include <linux/scatterlist.h>
14 #include <linux/workqueue.h>
15
16 #include "greybus.h"
17 #include "gbphy.h"
18
19 struct gb_sdio_host {
20 struct gb_connection *connection;
21 struct gbphy_device *gbphy_dev;
22 struct mmc_host *mmc;
23 struct mmc_request *mrq;
24 struct mutex lock; /* lock for this host */
25 size_t data_max;
26 spinlock_t xfer; /* lock to cancel ongoing transfer */
27 bool xfer_stop;
28 struct workqueue_struct *mrq_workqueue;
29 struct work_struct mrqwork;
30 u8 queued_events;
31 bool removed;
32 bool card_present;
33 bool read_only;
34 };
35
36
37 #define GB_SDIO_RSP_R1_R5_R6_R7 (GB_SDIO_RSP_PRESENT | GB_SDIO_RSP_CRC | \
38 GB_SDIO_RSP_OPCODE)
39 #define GB_SDIO_RSP_R3_R4 (GB_SDIO_RSP_PRESENT)
40 #define GB_SDIO_RSP_R2 (GB_SDIO_RSP_PRESENT | GB_SDIO_RSP_CRC | \
41 GB_SDIO_RSP_136)
42 #define GB_SDIO_RSP_R1B (GB_SDIO_RSP_PRESENT | GB_SDIO_RSP_CRC | \
43 GB_SDIO_RSP_OPCODE | GB_SDIO_RSP_BUSY)
44
45 /* kernel vdd starts at 0x80 and we need to translate to greybus ones 0x01 */
46 #define GB_SDIO_VDD_SHIFT 8
47
48 #ifndef MMC_CAP2_CORE_RUNTIME_PM
49 #define MMC_CAP2_CORE_RUNTIME_PM 0
50 #endif
51
single_op(struct mmc_command * cmd)52 static inline bool single_op(struct mmc_command *cmd)
53 {
54 u32 opcode = cmd->opcode;
55
56 return opcode == MMC_WRITE_BLOCK ||
57 opcode == MMC_READ_SINGLE_BLOCK;
58 }
59
_gb_sdio_set_host_caps(struct gb_sdio_host * host,u32 r)60 static void _gb_sdio_set_host_caps(struct gb_sdio_host *host, u32 r)
61 {
62 u32 caps = 0;
63 u32 caps2 = 0;
64
65 caps = ((r & GB_SDIO_CAP_NONREMOVABLE) ? MMC_CAP_NONREMOVABLE : 0) |
66 ((r & GB_SDIO_CAP_4_BIT_DATA) ? MMC_CAP_4_BIT_DATA : 0) |
67 ((r & GB_SDIO_CAP_8_BIT_DATA) ? MMC_CAP_8_BIT_DATA : 0) |
68 ((r & GB_SDIO_CAP_MMC_HS) ? MMC_CAP_MMC_HIGHSPEED : 0) |
69 ((r & GB_SDIO_CAP_SD_HS) ? MMC_CAP_SD_HIGHSPEED : 0) |
70 ((r & GB_SDIO_CAP_ERASE) ? MMC_CAP_ERASE : 0) |
71 ((r & GB_SDIO_CAP_1_2V_DDR) ? MMC_CAP_1_2V_DDR : 0) |
72 ((r & GB_SDIO_CAP_1_8V_DDR) ? MMC_CAP_1_8V_DDR : 0) |
73 ((r & GB_SDIO_CAP_POWER_OFF_CARD) ? MMC_CAP_POWER_OFF_CARD : 0) |
74 ((r & GB_SDIO_CAP_UHS_SDR12) ? MMC_CAP_UHS_SDR12 : 0) |
75 ((r & GB_SDIO_CAP_UHS_SDR25) ? MMC_CAP_UHS_SDR25 : 0) |
76 ((r & GB_SDIO_CAP_UHS_SDR50) ? MMC_CAP_UHS_SDR50 : 0) |
77 ((r & GB_SDIO_CAP_UHS_SDR104) ? MMC_CAP_UHS_SDR104 : 0) |
78 ((r & GB_SDIO_CAP_UHS_DDR50) ? MMC_CAP_UHS_DDR50 : 0) |
79 ((r & GB_SDIO_CAP_DRIVER_TYPE_A) ? MMC_CAP_DRIVER_TYPE_A : 0) |
80 ((r & GB_SDIO_CAP_DRIVER_TYPE_C) ? MMC_CAP_DRIVER_TYPE_C : 0) |
81 ((r & GB_SDIO_CAP_DRIVER_TYPE_D) ? MMC_CAP_DRIVER_TYPE_D : 0);
82
83 caps2 = ((r & GB_SDIO_CAP_HS200_1_2V) ? MMC_CAP2_HS200_1_2V_SDR : 0) |
84 ((r & GB_SDIO_CAP_HS400_1_2V) ? MMC_CAP2_HS400_1_2V : 0) |
85 ((r & GB_SDIO_CAP_HS400_1_8V) ? MMC_CAP2_HS400_1_8V : 0) |
86 ((r & GB_SDIO_CAP_HS200_1_8V) ? MMC_CAP2_HS200_1_8V_SDR : 0);
87
88 host->mmc->caps = caps;
89 host->mmc->caps2 = caps2 | MMC_CAP2_CORE_RUNTIME_PM;
90
91 if (caps & MMC_CAP_NONREMOVABLE)
92 host->card_present = true;
93 }
94
_gb_sdio_get_host_ocr(u32 ocr)95 static u32 _gb_sdio_get_host_ocr(u32 ocr)
96 {
97 return (((ocr & GB_SDIO_VDD_165_195) ? MMC_VDD_165_195 : 0) |
98 ((ocr & GB_SDIO_VDD_20_21) ? MMC_VDD_20_21 : 0) |
99 ((ocr & GB_SDIO_VDD_21_22) ? MMC_VDD_21_22 : 0) |
100 ((ocr & GB_SDIO_VDD_22_23) ? MMC_VDD_22_23 : 0) |
101 ((ocr & GB_SDIO_VDD_23_24) ? MMC_VDD_23_24 : 0) |
102 ((ocr & GB_SDIO_VDD_24_25) ? MMC_VDD_24_25 : 0) |
103 ((ocr & GB_SDIO_VDD_25_26) ? MMC_VDD_25_26 : 0) |
104 ((ocr & GB_SDIO_VDD_26_27) ? MMC_VDD_26_27 : 0) |
105 ((ocr & GB_SDIO_VDD_27_28) ? MMC_VDD_27_28 : 0) |
106 ((ocr & GB_SDIO_VDD_28_29) ? MMC_VDD_28_29 : 0) |
107 ((ocr & GB_SDIO_VDD_29_30) ? MMC_VDD_29_30 : 0) |
108 ((ocr & GB_SDIO_VDD_30_31) ? MMC_VDD_30_31 : 0) |
109 ((ocr & GB_SDIO_VDD_31_32) ? MMC_VDD_31_32 : 0) |
110 ((ocr & GB_SDIO_VDD_32_33) ? MMC_VDD_32_33 : 0) |
111 ((ocr & GB_SDIO_VDD_33_34) ? MMC_VDD_33_34 : 0) |
112 ((ocr & GB_SDIO_VDD_34_35) ? MMC_VDD_34_35 : 0) |
113 ((ocr & GB_SDIO_VDD_35_36) ? MMC_VDD_35_36 : 0)
114 );
115 }
116
gb_sdio_get_caps(struct gb_sdio_host * host)117 static int gb_sdio_get_caps(struct gb_sdio_host *host)
118 {
119 struct gb_sdio_get_caps_response response;
120 struct mmc_host *mmc = host->mmc;
121 u16 data_max;
122 u32 blksz;
123 u32 ocr;
124 u32 r;
125 int ret;
126
127 ret = gb_operation_sync(host->connection, GB_SDIO_TYPE_GET_CAPABILITIES,
128 NULL, 0, &response, sizeof(response));
129 if (ret < 0)
130 return ret;
131 r = le32_to_cpu(response.caps);
132
133 _gb_sdio_set_host_caps(host, r);
134
135 /* get the max block size that could fit our payload */
136 data_max = gb_operation_get_payload_size_max(host->connection);
137 data_max = min(data_max - sizeof(struct gb_sdio_transfer_request),
138 data_max - sizeof(struct gb_sdio_transfer_response));
139
140 blksz = min_t(u16, le16_to_cpu(response.max_blk_size), data_max);
141 blksz = max_t(u32, 512, blksz);
142
143 mmc->max_blk_size = rounddown_pow_of_two(blksz);
144 mmc->max_blk_count = le16_to_cpu(response.max_blk_count);
145 host->data_max = data_max;
146
147 /* get ocr supported values */
148 ocr = _gb_sdio_get_host_ocr(le32_to_cpu(response.ocr));
149 mmc->ocr_avail = ocr;
150 mmc->ocr_avail_sdio = mmc->ocr_avail;
151 mmc->ocr_avail_sd = mmc->ocr_avail;
152 mmc->ocr_avail_mmc = mmc->ocr_avail;
153
154 /* get frequency range values */
155 mmc->f_min = le32_to_cpu(response.f_min);
156 mmc->f_max = le32_to_cpu(response.f_max);
157
158 return 0;
159 }
160
_gb_queue_event(struct gb_sdio_host * host,u8 event)161 static void _gb_queue_event(struct gb_sdio_host *host, u8 event)
162 {
163 if (event & GB_SDIO_CARD_INSERTED)
164 host->queued_events &= ~GB_SDIO_CARD_REMOVED;
165 else if (event & GB_SDIO_CARD_REMOVED)
166 host->queued_events &= ~GB_SDIO_CARD_INSERTED;
167
168 host->queued_events |= event;
169 }
170
_gb_sdio_process_events(struct gb_sdio_host * host,u8 event)171 static int _gb_sdio_process_events(struct gb_sdio_host *host, u8 event)
172 {
173 u8 state_changed = 0;
174
175 if (event & GB_SDIO_CARD_INSERTED) {
176 if (host->mmc->caps & MMC_CAP_NONREMOVABLE)
177 return 0;
178 if (host->card_present)
179 return 0;
180 host->card_present = true;
181 state_changed = 1;
182 }
183
184 if (event & GB_SDIO_CARD_REMOVED) {
185 if (host->mmc->caps & MMC_CAP_NONREMOVABLE)
186 return 0;
187 if (!(host->card_present))
188 return 0;
189 host->card_present = false;
190 state_changed = 1;
191 }
192
193 if (event & GB_SDIO_WP)
194 host->read_only = true;
195
196 if (state_changed) {
197 dev_info(mmc_dev(host->mmc), "card %s now event\n",
198 (host->card_present ? "inserted" : "removed"));
199 mmc_detect_change(host->mmc, 0);
200 }
201
202 return 0;
203 }
204
gb_sdio_request_handler(struct gb_operation * op)205 static int gb_sdio_request_handler(struct gb_operation *op)
206 {
207 struct gb_sdio_host *host = gb_connection_get_data(op->connection);
208 struct gb_message *request;
209 struct gb_sdio_event_request *payload;
210 u8 type = op->type;
211 int ret = 0;
212 u8 event;
213
214 if (type != GB_SDIO_TYPE_EVENT) {
215 dev_err(mmc_dev(host->mmc),
216 "unsupported unsolicited event: %u\n", type);
217 return -EINVAL;
218 }
219
220 request = op->request;
221
222 if (request->payload_size < sizeof(*payload)) {
223 dev_err(mmc_dev(host->mmc), "wrong event size received (%zu < %zu)\n",
224 request->payload_size, sizeof(*payload));
225 return -EINVAL;
226 }
227
228 payload = request->payload;
229 event = payload->event;
230
231 if (host->removed)
232 _gb_queue_event(host, event);
233 else
234 ret = _gb_sdio_process_events(host, event);
235
236 return ret;
237 }
238
gb_sdio_set_ios(struct gb_sdio_host * host,struct gb_sdio_set_ios_request * request)239 static int gb_sdio_set_ios(struct gb_sdio_host *host,
240 struct gb_sdio_set_ios_request *request)
241 {
242 int ret;
243
244 ret = gbphy_runtime_get_sync(host->gbphy_dev);
245 if (ret)
246 return ret;
247
248 ret = gb_operation_sync(host->connection, GB_SDIO_TYPE_SET_IOS, request,
249 sizeof(*request), NULL, 0);
250
251 gbphy_runtime_put_autosuspend(host->gbphy_dev);
252
253 return ret;
254 }
255
_gb_sdio_send(struct gb_sdio_host * host,struct mmc_data * data,size_t len,u16 nblocks,off_t skip)256 static int _gb_sdio_send(struct gb_sdio_host *host, struct mmc_data *data,
257 size_t len, u16 nblocks, off_t skip)
258 {
259 struct gb_sdio_transfer_request *request;
260 struct gb_sdio_transfer_response *response;
261 struct gb_operation *operation;
262 struct scatterlist *sg = data->sg;
263 unsigned int sg_len = data->sg_len;
264 size_t copied;
265 u16 send_blksz;
266 u16 send_blocks;
267 int ret;
268
269 WARN_ON(len > host->data_max);
270
271 operation = gb_operation_create(host->connection, GB_SDIO_TYPE_TRANSFER,
272 len + sizeof(*request),
273 sizeof(*response), GFP_KERNEL);
274 if (!operation)
275 return -ENOMEM;
276
277 request = operation->request->payload;
278 request->data_flags = (data->flags >> 8);
279 request->data_blocks = cpu_to_le16(nblocks);
280 request->data_blksz = cpu_to_le16(data->blksz);
281
282 copied = sg_pcopy_to_buffer(sg, sg_len, &request->data[0], len, skip);
283
284 if (copied != len) {
285 ret = -EINVAL;
286 goto err_put_operation;
287 }
288
289 ret = gb_operation_request_send_sync(operation);
290 if (ret < 0)
291 goto err_put_operation;
292
293 response = operation->response->payload;
294
295 send_blocks = le16_to_cpu(response->data_blocks);
296 send_blksz = le16_to_cpu(response->data_blksz);
297
298 if (len != send_blksz * send_blocks) {
299 dev_err(mmc_dev(host->mmc), "send: size received: %zu != %d\n",
300 len, send_blksz * send_blocks);
301 ret = -EINVAL;
302 }
303
304 err_put_operation:
305 gb_operation_put(operation);
306
307 return ret;
308 }
309
_gb_sdio_recv(struct gb_sdio_host * host,struct mmc_data * data,size_t len,u16 nblocks,off_t skip)310 static int _gb_sdio_recv(struct gb_sdio_host *host, struct mmc_data *data,
311 size_t len, u16 nblocks, off_t skip)
312 {
313 struct gb_sdio_transfer_request *request;
314 struct gb_sdio_transfer_response *response;
315 struct gb_operation *operation;
316 struct scatterlist *sg = data->sg;
317 unsigned int sg_len = data->sg_len;
318 size_t copied;
319 u16 recv_blksz;
320 u16 recv_blocks;
321 int ret;
322
323 WARN_ON(len > host->data_max);
324
325 operation = gb_operation_create(host->connection, GB_SDIO_TYPE_TRANSFER,
326 sizeof(*request),
327 len + sizeof(*response), GFP_KERNEL);
328 if (!operation)
329 return -ENOMEM;
330
331 request = operation->request->payload;
332 request->data_flags = (data->flags >> 8);
333 request->data_blocks = cpu_to_le16(nblocks);
334 request->data_blksz = cpu_to_le16(data->blksz);
335
336 ret = gb_operation_request_send_sync(operation);
337 if (ret < 0)
338 goto err_put_operation;
339
340 response = operation->response->payload;
341 recv_blocks = le16_to_cpu(response->data_blocks);
342 recv_blksz = le16_to_cpu(response->data_blksz);
343
344 if (len != recv_blksz * recv_blocks) {
345 dev_err(mmc_dev(host->mmc), "recv: size received: %d != %zu\n",
346 recv_blksz * recv_blocks, len);
347 ret = -EINVAL;
348 goto err_put_operation;
349 }
350
351 copied = sg_pcopy_from_buffer(sg, sg_len, &response->data[0], len,
352 skip);
353 if (copied != len)
354 ret = -EINVAL;
355
356 err_put_operation:
357 gb_operation_put(operation);
358
359 return ret;
360 }
361
gb_sdio_transfer(struct gb_sdio_host * host,struct mmc_data * data)362 static int gb_sdio_transfer(struct gb_sdio_host *host, struct mmc_data *data)
363 {
364 size_t left, len;
365 off_t skip = 0;
366 int ret = 0;
367 u16 nblocks;
368
369 if (single_op(data->mrq->cmd) && data->blocks > 1) {
370 ret = -ETIMEDOUT;
371 goto out;
372 }
373
374 left = data->blksz * data->blocks;
375
376 while (left) {
377 /* check is a stop transmission is pending */
378 spin_lock(&host->xfer);
379 if (host->xfer_stop) {
380 host->xfer_stop = false;
381 spin_unlock(&host->xfer);
382 ret = -EINTR;
383 goto out;
384 }
385 spin_unlock(&host->xfer);
386 len = min(left, host->data_max);
387 nblocks = len / data->blksz;
388 len = nblocks * data->blksz;
389
390 if (data->flags & MMC_DATA_READ) {
391 ret = _gb_sdio_recv(host, data, len, nblocks, skip);
392 if (ret < 0)
393 goto out;
394 } else {
395 ret = _gb_sdio_send(host, data, len, nblocks, skip);
396 if (ret < 0)
397 goto out;
398 }
399 data->bytes_xfered += len;
400 left -= len;
401 skip += len;
402 }
403
404 out:
405 data->error = ret;
406 return ret;
407 }
408
gb_sdio_command(struct gb_sdio_host * host,struct mmc_command * cmd)409 static int gb_sdio_command(struct gb_sdio_host *host, struct mmc_command *cmd)
410 {
411 struct gb_sdio_command_request request = {0};
412 struct gb_sdio_command_response response;
413 struct mmc_data *data = host->mrq->data;
414 u8 cmd_flags;
415 u8 cmd_type;
416 int i;
417 int ret;
418
419 switch (mmc_resp_type(cmd)) {
420 case MMC_RSP_NONE:
421 cmd_flags = GB_SDIO_RSP_NONE;
422 break;
423 case MMC_RSP_R1:
424 cmd_flags = GB_SDIO_RSP_R1_R5_R6_R7;
425 break;
426 case MMC_RSP_R1B:
427 cmd_flags = GB_SDIO_RSP_R1B;
428 break;
429 case MMC_RSP_R2:
430 cmd_flags = GB_SDIO_RSP_R2;
431 break;
432 case MMC_RSP_R3:
433 cmd_flags = GB_SDIO_RSP_R3_R4;
434 break;
435 default:
436 dev_err(mmc_dev(host->mmc), "cmd flag invalid 0x%04x\n",
437 mmc_resp_type(cmd));
438 ret = -EINVAL;
439 goto out;
440 }
441
442 switch (mmc_cmd_type(cmd)) {
443 case MMC_CMD_BC:
444 cmd_type = GB_SDIO_CMD_BC;
445 break;
446 case MMC_CMD_BCR:
447 cmd_type = GB_SDIO_CMD_BCR;
448 break;
449 case MMC_CMD_AC:
450 cmd_type = GB_SDIO_CMD_AC;
451 break;
452 case MMC_CMD_ADTC:
453 cmd_type = GB_SDIO_CMD_ADTC;
454 break;
455 default:
456 dev_err(mmc_dev(host->mmc), "cmd type invalid 0x%04x\n",
457 mmc_cmd_type(cmd));
458 ret = -EINVAL;
459 goto out;
460 }
461
462 request.cmd = cmd->opcode;
463 request.cmd_flags = cmd_flags;
464 request.cmd_type = cmd_type;
465 request.cmd_arg = cpu_to_le32(cmd->arg);
466 /* some controllers need to know at command time data details */
467 if (data) {
468 request.data_blocks = cpu_to_le16(data->blocks);
469 request.data_blksz = cpu_to_le16(data->blksz);
470 }
471
472 ret = gb_operation_sync(host->connection, GB_SDIO_TYPE_COMMAND,
473 &request, sizeof(request), &response,
474 sizeof(response));
475 if (ret < 0)
476 goto out;
477
478 /* no response expected */
479 if (cmd_flags == GB_SDIO_RSP_NONE)
480 goto out;
481
482 /* long response expected */
483 if (cmd_flags & GB_SDIO_RSP_R2)
484 for (i = 0; i < 4; i++)
485 cmd->resp[i] = le32_to_cpu(response.resp[i]);
486 else
487 cmd->resp[0] = le32_to_cpu(response.resp[0]);
488
489 out:
490 cmd->error = ret;
491 return ret;
492 }
493
gb_sdio_mrq_work(struct work_struct * work)494 static void gb_sdio_mrq_work(struct work_struct *work)
495 {
496 struct gb_sdio_host *host;
497 struct mmc_request *mrq;
498 int ret;
499
500 host = container_of(work, struct gb_sdio_host, mrqwork);
501
502 ret = gbphy_runtime_get_sync(host->gbphy_dev);
503 if (ret)
504 return;
505
506 mutex_lock(&host->lock);
507 mrq = host->mrq;
508 if (!mrq) {
509 mutex_unlock(&host->lock);
510 gbphy_runtime_put_autosuspend(host->gbphy_dev);
511 dev_err(mmc_dev(host->mmc), "mmc request is NULL");
512 return;
513 }
514
515 if (host->removed) {
516 mrq->cmd->error = -ESHUTDOWN;
517 goto done;
518 }
519
520 if (mrq->sbc) {
521 ret = gb_sdio_command(host, mrq->sbc);
522 if (ret < 0)
523 goto done;
524 }
525
526 ret = gb_sdio_command(host, mrq->cmd);
527 if (ret < 0)
528 goto done;
529
530 if (mrq->data) {
531 ret = gb_sdio_transfer(host, mrq->data);
532 if (ret < 0)
533 goto done;
534 }
535
536 if (mrq->stop) {
537 ret = gb_sdio_command(host, mrq->stop);
538 if (ret < 0)
539 goto done;
540 }
541
542 done:
543 host->mrq = NULL;
544 mutex_unlock(&host->lock);
545 mmc_request_done(host->mmc, mrq);
546 gbphy_runtime_put_autosuspend(host->gbphy_dev);
547 }
548
gb_mmc_request(struct mmc_host * mmc,struct mmc_request * mrq)549 static void gb_mmc_request(struct mmc_host *mmc, struct mmc_request *mrq)
550 {
551 struct gb_sdio_host *host = mmc_priv(mmc);
552 struct mmc_command *cmd = mrq->cmd;
553
554 /* Check if it is a cancel to ongoing transfer */
555 if (cmd->opcode == MMC_STOP_TRANSMISSION) {
556 spin_lock(&host->xfer);
557 host->xfer_stop = true;
558 spin_unlock(&host->xfer);
559 }
560
561 mutex_lock(&host->lock);
562
563 WARN_ON(host->mrq);
564 host->mrq = mrq;
565
566 if (host->removed) {
567 mrq->cmd->error = -ESHUTDOWN;
568 goto out;
569 }
570 if (!host->card_present) {
571 mrq->cmd->error = -ENOMEDIUM;
572 goto out;
573 }
574
575 queue_work(host->mrq_workqueue, &host->mrqwork);
576
577 mutex_unlock(&host->lock);
578 return;
579
580 out:
581 host->mrq = NULL;
582 mutex_unlock(&host->lock);
583 mmc_request_done(mmc, mrq);
584 }
585
gb_mmc_set_ios(struct mmc_host * mmc,struct mmc_ios * ios)586 static void gb_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
587 {
588 struct gb_sdio_host *host = mmc_priv(mmc);
589 struct gb_sdio_set_ios_request request;
590 int ret;
591 u8 power_mode;
592 u8 bus_width;
593 u8 timing;
594 u8 signal_voltage;
595 u8 drv_type;
596 u32 vdd = 0;
597
598 mutex_lock(&host->lock);
599 request.clock = cpu_to_le32(ios->clock);
600
601 if (ios->vdd)
602 vdd = 1 << (ios->vdd - GB_SDIO_VDD_SHIFT);
603 request.vdd = cpu_to_le32(vdd);
604
605 request.bus_mode = (ios->bus_mode == MMC_BUSMODE_OPENDRAIN ?
606 GB_SDIO_BUSMODE_OPENDRAIN :
607 GB_SDIO_BUSMODE_PUSHPULL);
608
609 switch (ios->power_mode) {
610 case MMC_POWER_OFF:
611 default:
612 power_mode = GB_SDIO_POWER_OFF;
613 break;
614 case MMC_POWER_UP:
615 power_mode = GB_SDIO_POWER_UP;
616 break;
617 case MMC_POWER_ON:
618 power_mode = GB_SDIO_POWER_ON;
619 break;
620 case MMC_POWER_UNDEFINED:
621 power_mode = GB_SDIO_POWER_UNDEFINED;
622 break;
623 }
624 request.power_mode = power_mode;
625
626 switch (ios->bus_width) {
627 case MMC_BUS_WIDTH_1:
628 bus_width = GB_SDIO_BUS_WIDTH_1;
629 break;
630 case MMC_BUS_WIDTH_4:
631 default:
632 bus_width = GB_SDIO_BUS_WIDTH_4;
633 break;
634 case MMC_BUS_WIDTH_8:
635 bus_width = GB_SDIO_BUS_WIDTH_8;
636 break;
637 }
638 request.bus_width = bus_width;
639
640 switch (ios->timing) {
641 case MMC_TIMING_LEGACY:
642 default:
643 timing = GB_SDIO_TIMING_LEGACY;
644 break;
645 case MMC_TIMING_MMC_HS:
646 timing = GB_SDIO_TIMING_MMC_HS;
647 break;
648 case MMC_TIMING_SD_HS:
649 timing = GB_SDIO_TIMING_SD_HS;
650 break;
651 case MMC_TIMING_UHS_SDR12:
652 timing = GB_SDIO_TIMING_UHS_SDR12;
653 break;
654 case MMC_TIMING_UHS_SDR25:
655 timing = GB_SDIO_TIMING_UHS_SDR25;
656 break;
657 case MMC_TIMING_UHS_SDR50:
658 timing = GB_SDIO_TIMING_UHS_SDR50;
659 break;
660 case MMC_TIMING_UHS_SDR104:
661 timing = GB_SDIO_TIMING_UHS_SDR104;
662 break;
663 case MMC_TIMING_UHS_DDR50:
664 timing = GB_SDIO_TIMING_UHS_DDR50;
665 break;
666 case MMC_TIMING_MMC_DDR52:
667 timing = GB_SDIO_TIMING_MMC_DDR52;
668 break;
669 case MMC_TIMING_MMC_HS200:
670 timing = GB_SDIO_TIMING_MMC_HS200;
671 break;
672 case MMC_TIMING_MMC_HS400:
673 timing = GB_SDIO_TIMING_MMC_HS400;
674 break;
675 }
676 request.timing = timing;
677
678 switch (ios->signal_voltage) {
679 case MMC_SIGNAL_VOLTAGE_330:
680 signal_voltage = GB_SDIO_SIGNAL_VOLTAGE_330;
681 break;
682 case MMC_SIGNAL_VOLTAGE_180:
683 default:
684 signal_voltage = GB_SDIO_SIGNAL_VOLTAGE_180;
685 break;
686 case MMC_SIGNAL_VOLTAGE_120:
687 signal_voltage = GB_SDIO_SIGNAL_VOLTAGE_120;
688 break;
689 }
690 request.signal_voltage = signal_voltage;
691
692 switch (ios->drv_type) {
693 case MMC_SET_DRIVER_TYPE_A:
694 drv_type = GB_SDIO_SET_DRIVER_TYPE_A;
695 break;
696 case MMC_SET_DRIVER_TYPE_C:
697 drv_type = GB_SDIO_SET_DRIVER_TYPE_C;
698 break;
699 case MMC_SET_DRIVER_TYPE_D:
700 drv_type = GB_SDIO_SET_DRIVER_TYPE_D;
701 break;
702 case MMC_SET_DRIVER_TYPE_B:
703 default:
704 drv_type = GB_SDIO_SET_DRIVER_TYPE_B;
705 break;
706 }
707 request.drv_type = drv_type;
708
709 ret = gb_sdio_set_ios(host, &request);
710 if (ret < 0)
711 goto out;
712
713 memcpy(&mmc->ios, ios, sizeof(mmc->ios));
714
715 out:
716 mutex_unlock(&host->lock);
717 }
718
gb_mmc_get_ro(struct mmc_host * mmc)719 static int gb_mmc_get_ro(struct mmc_host *mmc)
720 {
721 struct gb_sdio_host *host = mmc_priv(mmc);
722
723 mutex_lock(&host->lock);
724 if (host->removed) {
725 mutex_unlock(&host->lock);
726 return -ESHUTDOWN;
727 }
728 mutex_unlock(&host->lock);
729
730 return host->read_only;
731 }
732
gb_mmc_get_cd(struct mmc_host * mmc)733 static int gb_mmc_get_cd(struct mmc_host *mmc)
734 {
735 struct gb_sdio_host *host = mmc_priv(mmc);
736
737 mutex_lock(&host->lock);
738 if (host->removed) {
739 mutex_unlock(&host->lock);
740 return -ESHUTDOWN;
741 }
742 mutex_unlock(&host->lock);
743
744 return host->card_present;
745 }
746
gb_mmc_switch_voltage(struct mmc_host * mmc,struct mmc_ios * ios)747 static int gb_mmc_switch_voltage(struct mmc_host *mmc, struct mmc_ios *ios)
748 {
749 return 0;
750 }
751
752 static const struct mmc_host_ops gb_sdio_ops = {
753 .request = gb_mmc_request,
754 .set_ios = gb_mmc_set_ios,
755 .get_ro = gb_mmc_get_ro,
756 .get_cd = gb_mmc_get_cd,
757 .start_signal_voltage_switch = gb_mmc_switch_voltage,
758 };
759
gb_sdio_probe(struct gbphy_device * gbphy_dev,const struct gbphy_device_id * id)760 static int gb_sdio_probe(struct gbphy_device *gbphy_dev,
761 const struct gbphy_device_id *id)
762 {
763 struct gb_connection *connection;
764 struct mmc_host *mmc;
765 struct gb_sdio_host *host;
766 int ret = 0;
767
768 mmc = mmc_alloc_host(sizeof(*host), &gbphy_dev->dev);
769 if (!mmc)
770 return -ENOMEM;
771
772 connection = gb_connection_create(gbphy_dev->bundle,
773 le16_to_cpu(gbphy_dev->cport_desc->id),
774 gb_sdio_request_handler);
775 if (IS_ERR(connection)) {
776 ret = PTR_ERR(connection);
777 goto exit_mmc_free;
778 }
779
780 host = mmc_priv(mmc);
781 host->mmc = mmc;
782 host->removed = true;
783
784 host->connection = connection;
785 gb_connection_set_data(connection, host);
786 host->gbphy_dev = gbphy_dev;
787 gb_gbphy_set_data(gbphy_dev, host);
788
789 ret = gb_connection_enable_tx(connection);
790 if (ret)
791 goto exit_connection_destroy;
792
793 ret = gb_sdio_get_caps(host);
794 if (ret < 0)
795 goto exit_connection_disable;
796
797 mmc->ops = &gb_sdio_ops;
798
799 mmc->max_segs = host->mmc->max_blk_count;
800
801 /* for now we make a map 1:1 between max request and segment size */
802 mmc->max_req_size = mmc->max_blk_size * mmc->max_blk_count;
803 mmc->max_seg_size = mmc->max_req_size;
804
805 mutex_init(&host->lock);
806 spin_lock_init(&host->xfer);
807 host->mrq_workqueue = alloc_workqueue("mmc-%s", 0, 1,
808 dev_name(&gbphy_dev->dev));
809 if (!host->mrq_workqueue) {
810 ret = -ENOMEM;
811 goto exit_connection_disable;
812 }
813 INIT_WORK(&host->mrqwork, gb_sdio_mrq_work);
814
815 ret = gb_connection_enable(connection);
816 if (ret)
817 goto exit_wq_destroy;
818
819 ret = mmc_add_host(mmc);
820 if (ret < 0)
821 goto exit_wq_destroy;
822 host->removed = false;
823 ret = _gb_sdio_process_events(host, host->queued_events);
824 host->queued_events = 0;
825
826 gbphy_runtime_put_autosuspend(gbphy_dev);
827
828 return ret;
829
830 exit_wq_destroy:
831 destroy_workqueue(host->mrq_workqueue);
832 exit_connection_disable:
833 gb_connection_disable(connection);
834 exit_connection_destroy:
835 gb_connection_destroy(connection);
836 exit_mmc_free:
837 mmc_free_host(mmc);
838
839 return ret;
840 }
841
gb_sdio_remove(struct gbphy_device * gbphy_dev)842 static void gb_sdio_remove(struct gbphy_device *gbphy_dev)
843 {
844 struct gb_sdio_host *host = gb_gbphy_get_data(gbphy_dev);
845 struct gb_connection *connection = host->connection;
846 struct mmc_host *mmc;
847 int ret;
848
849 ret = gbphy_runtime_get_sync(gbphy_dev);
850 if (ret)
851 gbphy_runtime_get_noresume(gbphy_dev);
852
853 mutex_lock(&host->lock);
854 host->removed = true;
855 mmc = host->mmc;
856 gb_connection_set_data(connection, NULL);
857 mutex_unlock(&host->lock);
858
859 flush_workqueue(host->mrq_workqueue);
860 destroy_workqueue(host->mrq_workqueue);
861 gb_connection_disable_rx(connection);
862 mmc_remove_host(mmc);
863 gb_connection_disable(connection);
864 gb_connection_destroy(connection);
865 mmc_free_host(mmc);
866 }
867
868 static const struct gbphy_device_id gb_sdio_id_table[] = {
869 { GBPHY_PROTOCOL(GREYBUS_PROTOCOL_SDIO) },
870 { },
871 };
872 MODULE_DEVICE_TABLE(gbphy, gb_sdio_id_table);
873
874 static struct gbphy_driver sdio_driver = {
875 .name = "sdio",
876 .probe = gb_sdio_probe,
877 .remove = gb_sdio_remove,
878 .id_table = gb_sdio_id_table,
879 };
880
881 module_gbphy_driver(sdio_driver);
882 MODULE_LICENSE("GPL v2");
883
