xref: /dragonfly/sys/bus/mmc/mmc.c (revision 25a2db75)
1 /*-
2  * Copyright (c) 2006 Bernd Walter.  All rights reserved.
3  * Copyright (c) 2006 M. Warner Losh.  All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
8  * 1. Redistributions of source code must retain the above copyright
9  *    notice, this list of conditions and the following disclaimer.
10  * 2. Redistributions in binary form must reproduce the above copyright
11  *    notice, this list of conditions and the following disclaimer in the
12  *    documentation and/or other materials provided with the distribution.
13  *
14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
15  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
16  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
17  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
18  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
19  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
20  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
21  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
23  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24  *
25  * Portions of this software may have been developed with reference to
26  * the SD Simplified Specification.  The following disclaimer may apply:
27  *
28  * The following conditions apply to the release of the simplified
29  * specification ("Simplified Specification") by the SD Card Association and
30  * the SD Group. The Simplified Specification is a subset of the complete SD
31  * Specification which is owned by the SD Card Association and the SD
32  * Group. This Simplified Specification is provided on a non-confidential
33  * basis subject to the disclaimers below. Any implementation of the
34  * Simplified Specification may require a license from the SD Card
35  * Association, SD Group, SD-3C LLC or other third parties.
36  *
37  * Disclaimers:
38  *
39  * The information contained in the Simplified Specification is presented only
40  * as a standard specification for SD Cards and SD Host/Ancillary products and
41  * is provided "AS-IS" without any representations or warranties of any
42  * kind. No responsibility is assumed by the SD Group, SD-3C LLC or the SD
43  * Card Association for any damages, any infringements of patents or other
44  * right of the SD Group, SD-3C LLC, the SD Card Association or any third
45  * parties, which may result from its use. No license is granted by
46  * implication, estoppel or otherwise under any patent or other rights of the
47  * SD Group, SD-3C LLC, the SD Card Association or any third party. Nothing
48  * herein shall be construed as an obligation by the SD Group, the SD-3C LLC
49  * or the SD Card Association to disclose or distribute any technical
50  * information, know-how or other confidential information to any third party.
51  *
52  * $FreeBSD: src/sys/dev/mmc/mmc.c,v 1.38 2009/08/20 19:17:53 jhb Exp $
53  */
54 
55 #include <sys/param.h>
56 #include <sys/systm.h>
57 #include <sys/kernel.h>
58 #include <sys/malloc.h>
59 #include <sys/lock.h>
60 #include <sys/module.h>
61 #include <sys/spinlock.h>
62 #include <sys/bus.h>
63 #include <sys/endian.h>
64 #include <sys/sysctl.h>
65 
66 #include <bus/mmc/mmcreg.h>
67 #include <bus/mmc/mmcbrvar.h>
68 #include <bus/mmc/mmcvar.h>
69 #include "mmcbr_if.h"
70 #include "mmcbus_if.h"
71 
72 struct mmc_softc {
73 	device_t dev;
74 	struct lock sc_lock;
75 	struct intr_config_hook config_intrhook;
76 	device_t owner;
77 	uint32_t last_rca;
78 };
79 
80 /*
81  * Per-card data
82  */
83 struct mmc_ivars {
84 	uint32_t raw_cid[4];	/* Raw bits of the CID */
85 	uint32_t raw_csd[4];	/* Raw bits of the CSD */
86 	uint32_t raw_scr[2];	/* Raw bits of the SCR */
87 	uint8_t raw_ext_csd[512];	/* Raw bits of the EXT_CSD */
88 	uint32_t raw_sd_status[16];	/* Raw bits of the SD_STATUS */
89 	uint16_t rca;
90 	enum mmc_card_mode mode;
91 	struct mmc_cid cid;	/* cid decoded */
92 	struct mmc_csd csd;	/* csd decoded */
93 	struct mmc_scr scr;	/* scr decoded */
94 	struct mmc_sd_status sd_status;	/* SD_STATUS decoded */
95 	u_char read_only;	/* True when the device is read-only */
96 	u_char bus_width;	/* Bus width to use */
97 	u_char timing;		/* Bus timing support */
98 	u_char high_cap;	/* High Capacity card (block addressed) */
99 	uint32_t sec_count;	/* Card capacity in 512byte blocks */
100 	uint32_t tran_speed;	/* Max speed in normal mode */
101 	uint32_t hs_tran_speed;	/* Max speed in high speed mode */
102 	uint32_t erase_sector;	/* Card native erase sector size */
103 };
104 
105 #define CMD_RETRIES	3
106 
107 SYSCTL_NODE(_hw, OID_AUTO, mmc, CTLFLAG_RD, NULL, "mmc driver");
108 
109 static int mmc_debug;
110 SYSCTL_INT(_hw_mmc, OID_AUTO, debug, CTLFLAG_RW, &mmc_debug, 0, "Debug level");
111 
112 /* bus entry points */
113 static int mmc_probe(device_t dev);
114 static int mmc_attach(device_t dev);
115 static int mmc_detach(device_t dev);
116 static int mmc_suspend(device_t dev);
117 static int mmc_resume(device_t dev);
118 
119 #define MMC_LOCK(_sc)		lockmgr(&(_sc)->sc_lock, LK_EXCLUSIVE)
120 #define	MMC_UNLOCK(_sc)		lockmgr(&(_sc)->sc_lock, LK_RELEASE)
121 #define MMC_LOCK_INIT(_sc)	lockinit(&(_sc)->sc_lock, "mmc", 0, LK_CANRECURSE)
122 #define MMC_LOCK_DESTROY(_sc)	lockuninit(&(_sc)->sc_lock);
123 #define MMC_ASSERT_LOCKED(_sc)	KKASSERT(lockstatus(&(_sc)->sc_lock, curthread) != 0);
124 #define MMC_ASSERT_UNLOCKED(_sc) KKASSERT(lockstatus(&(_sc)->sc_lock, curthread) == 0);
125 
126 static int mmc_calculate_clock(struct mmc_softc *sc);
127 static void mmc_delayed_attach(void *);
128 static void mmc_power_down(struct mmc_softc *sc);
129 static int mmc_wait_for_cmd(struct mmc_softc *sc, struct mmc_command *cmd,
130     int retries);
131 static int mmc_wait_for_command(struct mmc_softc *sc, uint32_t opcode,
132     uint32_t arg, uint32_t flags, uint32_t *resp, int retries);
133 static int mmc_select_card(struct mmc_softc *sc, uint16_t rca);
134 static int mmc_set_card_bus_width(struct mmc_softc *sc, uint16_t rca, int width);
135 static int mmc_app_send_scr(struct mmc_softc *sc, uint16_t rca, uint32_t *rawscr);
136 static void mmc_app_decode_scr(uint32_t *raw_scr, struct mmc_scr *scr);
137 static int mmc_send_ext_csd(struct mmc_softc *sc, uint8_t *rawextcsd);
138 static void mmc_scan(struct mmc_softc *sc);
139 static int mmc_delete_cards(struct mmc_softc *sc);
140 
141 static void
142 mmc_ms_delay(int ms)
143 {
144 	DELAY(1000 * ms);	/* XXX BAD */
145 }
146 
147 static int
148 mmc_probe(device_t dev)
149 {
150 
151 	device_set_desc(dev, "MMC/SD bus");
152 	return (0);
153 }
154 
155 static int
156 mmc_attach(device_t dev)
157 {
158 	struct mmc_softc *sc;
159 
160 	sc = device_get_softc(dev);
161 	sc->dev = dev;
162 	MMC_LOCK_INIT(sc);
163 
164 	/* We'll probe and attach our children later, but before / mount */
165 	sc->config_intrhook.ich_func = mmc_delayed_attach;
166 	sc->config_intrhook.ich_arg = sc;
167 	sc->config_intrhook.ich_desc = "mmc";
168 	if (config_intrhook_establish(&sc->config_intrhook) != 0)
169 		device_printf(dev, "config_intrhook_establish failed\n");
170 	return (0);
171 }
172 
173 static int
174 mmc_detach(device_t dev)
175 {
176 	struct mmc_softc *sc = device_get_softc(dev);
177 	int err;
178 
179 	if ((err = mmc_delete_cards(sc)) != 0)
180 		return (err);
181 	mmc_power_down(sc);
182 	MMC_LOCK_DESTROY(sc);
183 
184 	return (0);
185 }
186 
187 static int
188 mmc_suspend(device_t dev)
189 {
190 	struct mmc_softc *sc = device_get_softc(dev);
191 	int err;
192 
193 	err = bus_generic_suspend(dev);
194 	if (err)
195 	        return (err);
196 	mmc_power_down(sc);
197 	return (0);
198 }
199 
200 static int
201 mmc_resume(device_t dev)
202 {
203 	struct mmc_softc *sc = device_get_softc(dev);
204 
205 	mmc_scan(sc);
206 	return (bus_generic_resume(dev));
207 }
208 
209 static int
210 mmc_acquire_bus(device_t busdev, device_t dev)
211 {
212 	struct mmc_softc *sc;
213 	struct mmc_ivars *ivar;
214 	int err;
215 	int rca;
216 
217 	err = MMCBR_ACQUIRE_HOST(device_get_parent(busdev), busdev);
218 	if (err)
219 		return (err);
220 	sc = device_get_softc(busdev);
221 	MMC_LOCK(sc);
222 	if (sc->owner)
223 		panic("mmc: host bridge didn't seralize us.");
224 	sc->owner = dev;
225 	MMC_UNLOCK(sc);
226 
227 	if (busdev != dev) {
228 		/*
229 		 * Keep track of the last rca that we've selected.  If
230 		 * we're asked to do it again, don't.  We never
231 		 * unselect unless the bus code itself wants the mmc
232 		 * bus, and constantly reselecting causes problems.
233 		 */
234 		rca = mmc_get_rca(dev);
235 		if (sc->last_rca != rca) {
236 			mmc_select_card(sc, rca);
237 			sc->last_rca = rca;
238 			/* Prepare bus width for the new card. */
239 			ivar = device_get_ivars(dev);
240 			if (bootverbose || mmc_debug) {
241 				device_printf(busdev,
242 				    "setting bus width to %d bits\n",
243 				    (ivar->bus_width == bus_width_4) ? 4 :
244 				    (ivar->bus_width == bus_width_8) ? 8 : 1);
245 			}
246 			mmc_set_card_bus_width(sc, rca, ivar->bus_width);
247 			mmcbr_set_bus_width(busdev, ivar->bus_width);
248 			mmcbr_update_ios(busdev);
249 		}
250 	} else {
251 		/*
252 		 * If there's a card selected, stand down.
253 		 */
254 		if (sc->last_rca != 0) {
255 			mmc_select_card(sc, 0);
256 			sc->last_rca = 0;
257 		}
258 	}
259 
260 	return (0);
261 }
262 
263 static int
264 mmc_release_bus(device_t busdev, device_t dev)
265 {
266 	struct mmc_softc *sc;
267 	int err;
268 
269 	sc = device_get_softc(busdev);
270 
271 	MMC_LOCK(sc);
272 	if (!sc->owner)
273 		panic("mmc: releasing unowned bus.");
274 	if (sc->owner != dev)
275 		panic("mmc: you don't own the bus.  game over.");
276 	MMC_UNLOCK(sc);
277 	err = MMCBR_RELEASE_HOST(device_get_parent(busdev), busdev);
278 	if (err)
279 		return (err);
280 	MMC_LOCK(sc);
281 	sc->owner = NULL;
282 	MMC_UNLOCK(sc);
283 	return (0);
284 }
285 
286 static uint32_t
287 mmc_select_vdd(struct mmc_softc *sc, uint32_t ocr)
288 {
289 
290 	return (ocr & MMC_OCR_VOLTAGE);
291 }
292 
293 static int
294 mmc_highest_voltage(uint32_t ocr)
295 {
296 	int i;
297 
298 	for (i = 30; i >= 0; i--)
299 		if (ocr & (1 << i))
300 			return (i);
301 	return (-1);
302 }
303 
304 static void
305 mmc_wakeup(struct mmc_request *req)
306 {
307 	struct mmc_softc *sc;
308 
309 	sc = (struct mmc_softc *)req->done_data;
310 	MMC_LOCK(sc);
311 	req->flags |= MMC_REQ_DONE;
312 	MMC_UNLOCK(sc);
313 	wakeup(req);
314 }
315 
316 static int
317 mmc_wait_for_req(struct mmc_softc *sc, struct mmc_request *req)
318 {
319 
320 	req->done = mmc_wakeup;
321 	req->done_data = sc;
322 	if (mmc_debug > 1) {
323 		device_printf(sc->dev, "REQUEST: CMD%d arg %#x flags %#x",
324 		    req->cmd->opcode, req->cmd->arg, req->cmd->flags);
325 		if (req->cmd->data) {
326 			kprintf(" data %d\n", (int)req->cmd->data->len);
327 		} else
328 			kprintf("\n");
329 	}
330 	MMCBR_REQUEST(device_get_parent(sc->dev), sc->dev, req);
331 	MMC_LOCK(sc);
332 	while ((req->flags & MMC_REQ_DONE) == 0)
333 		lksleep(req, &sc->sc_lock, 0, "mmcreq", 0);
334 	MMC_UNLOCK(sc);
335 	if (mmc_debug > 2 || (mmc_debug > 1 && req->cmd->error))
336 		device_printf(sc->dev, "RESULT: %d\n", req->cmd->error);
337 	return (0);
338 }
339 
340 static int
341 mmc_wait_for_request(device_t brdev, device_t reqdev, struct mmc_request *req)
342 {
343 	struct mmc_softc *sc = device_get_softc(brdev);
344 
345 	return (mmc_wait_for_req(sc, req));
346 }
347 
348 static int
349 mmc_wait_for_cmd(struct mmc_softc *sc, struct mmc_command *cmd, int retries)
350 {
351 	struct mmc_request mreq;
352 
353 	memset(&mreq, 0, sizeof(mreq));
354 	memset(cmd->resp, 0, sizeof(cmd->resp));
355 	cmd->retries = retries;
356 	mreq.cmd = cmd;
357 	mmc_wait_for_req(sc, &mreq);
358 	return (cmd->error);
359 }
360 
361 static int
362 mmc_wait_for_app_cmd(struct mmc_softc *sc, uint32_t rca,
363     struct mmc_command *cmd, int retries)
364 {
365 	struct mmc_command appcmd;
366 	int err = MMC_ERR_NONE, i;
367 
368 	for (i = 0; i <= retries; i++) {
369 		appcmd.opcode = MMC_APP_CMD;
370 		appcmd.arg = rca << 16;
371 		appcmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
372 		appcmd.data = NULL;
373 		mmc_wait_for_cmd(sc, &appcmd, 0);
374 		err = appcmd.error;
375 		if (err != MMC_ERR_NONE)
376 			continue;
377 		if (!(appcmd.resp[0] & R1_APP_CMD))
378 			return MMC_ERR_FAILED;
379 		mmc_wait_for_cmd(sc, cmd, 0);
380 		err = cmd->error;
381 		if (err == MMC_ERR_NONE)
382 			break;
383 	}
384 	return (err);
385 }
386 
387 static int
388 mmc_wait_for_command(struct mmc_softc *sc, uint32_t opcode,
389     uint32_t arg, uint32_t flags, uint32_t *resp, int retries)
390 {
391 	struct mmc_command cmd;
392 	int err;
393 
394 	memset(&cmd, 0, sizeof(cmd));
395 	cmd.opcode = opcode;
396 	cmd.arg = arg;
397 	cmd.flags = flags;
398 	cmd.data = NULL;
399 	err = mmc_wait_for_cmd(sc, &cmd, retries);
400 	if (err)
401 		return (err);
402 	if (cmd.error)
403 		return (cmd.error);
404 	if (resp) {
405 		if (flags & MMC_RSP_136)
406 			memcpy(resp, cmd.resp, 4 * sizeof(uint32_t));
407 		else
408 			*resp = cmd.resp[0];
409 	}
410 	return (0);
411 }
412 
413 static void
414 mmc_idle_cards(struct mmc_softc *sc)
415 {
416 	device_t dev;
417 	struct mmc_command cmd;
418 
419 	dev = sc->dev;
420 	mmcbr_set_chip_select(dev, cs_high);
421 	mmcbr_update_ios(dev);
422 	mmc_ms_delay(1);
423 
424 	memset(&cmd, 0, sizeof(cmd));
425 	cmd.opcode = MMC_GO_IDLE_STATE;
426 	cmd.arg = 0;
427 	cmd.flags = MMC_RSP_NONE | MMC_CMD_BC;
428 	cmd.data = NULL;
429 	mmc_wait_for_cmd(sc, &cmd, 0);
430 	mmc_ms_delay(1);
431 
432 	mmcbr_set_chip_select(dev, cs_dontcare);
433 	mmcbr_update_ios(dev);
434 	mmc_ms_delay(1);
435 }
436 
437 static int
438 mmc_send_app_op_cond(struct mmc_softc *sc, uint32_t ocr, uint32_t *rocr)
439 {
440 	struct mmc_command cmd;
441 	int err = MMC_ERR_NONE, i;
442 
443 	memset(&cmd, 0, sizeof(cmd));
444 	cmd.opcode = ACMD_SD_SEND_OP_COND;
445 	cmd.arg = ocr;
446 	cmd.flags = MMC_RSP_R3 | MMC_CMD_BCR;
447 	cmd.data = NULL;
448 
449 	for (i = 0; i < 100; i++) {
450 		err = mmc_wait_for_app_cmd(sc, 0, &cmd, CMD_RETRIES);
451 		if (err != MMC_ERR_NONE)
452 			break;
453 		if ((cmd.resp[0] & MMC_OCR_CARD_BUSY) ||
454 		    (ocr & MMC_OCR_VOLTAGE) == 0)
455 			break;
456 		err = MMC_ERR_TIMEOUT;
457 		mmc_ms_delay(10);
458 	}
459 	if (rocr && err == MMC_ERR_NONE)
460 		*rocr = cmd.resp[0];
461 	return (err);
462 }
463 
464 static int
465 mmc_send_op_cond(struct mmc_softc *sc, uint32_t ocr, uint32_t *rocr)
466 {
467 	struct mmc_command cmd;
468 	int err = MMC_ERR_NONE, i;
469 
470 	memset(&cmd, 0, sizeof(cmd));
471 	cmd.opcode = MMC_SEND_OP_COND;
472 	cmd.arg = ocr;
473 	cmd.flags = MMC_RSP_R3 | MMC_CMD_BCR;
474 	cmd.data = NULL;
475 
476 	for (i = 0; i < 100; i++) {
477 		err = mmc_wait_for_cmd(sc, &cmd, CMD_RETRIES);
478 		if (err != MMC_ERR_NONE)
479 			break;
480 		if ((cmd.resp[0] & MMC_OCR_CARD_BUSY) ||
481 		    (ocr & MMC_OCR_VOLTAGE) == 0)
482 			break;
483 		err = MMC_ERR_TIMEOUT;
484 		mmc_ms_delay(10);
485 	}
486 	if (rocr && err == MMC_ERR_NONE)
487 		*rocr = cmd.resp[0];
488 	return (err);
489 }
490 
491 static int
492 mmc_send_if_cond(struct mmc_softc *sc, uint8_t vhs)
493 {
494 	struct mmc_command cmd;
495 	int err;
496 
497 	memset(&cmd, 0, sizeof(cmd));
498 	cmd.opcode = SD_SEND_IF_COND;
499 	cmd.arg = (vhs << 8) + 0xAA;
500 	cmd.flags = MMC_RSP_R7 | MMC_CMD_BCR;
501 	cmd.data = NULL;
502 
503 	err = mmc_wait_for_cmd(sc, &cmd, CMD_RETRIES);
504 	return (err);
505 }
506 
507 static void
508 mmc_power_up(struct mmc_softc *sc)
509 {
510 	device_t dev;
511 
512 	dev = sc->dev;
513 	mmcbr_set_vdd(dev, mmc_highest_voltage(mmcbr_get_host_ocr(dev)));
514 	mmcbr_set_bus_mode(dev, opendrain);
515 	mmcbr_set_chip_select(dev, cs_dontcare);
516 	mmcbr_set_bus_width(dev, bus_width_1);
517 	mmcbr_set_power_mode(dev, power_up);
518 	mmcbr_set_clock(dev, 0);
519 	mmcbr_update_ios(dev);
520 	mmc_ms_delay(1);
521 
522 	mmcbr_set_clock(dev, mmcbr_get_f_min(sc->dev));
523 	mmcbr_set_timing(dev, bus_timing_normal);
524 	mmcbr_set_power_mode(dev, power_on);
525 	mmcbr_update_ios(dev);
526 	mmc_ms_delay(2);
527 }
528 
529 static void
530 mmc_power_down(struct mmc_softc *sc)
531 {
532 	device_t dev = sc->dev;
533 
534 	mmcbr_set_bus_mode(dev, opendrain);
535 	mmcbr_set_chip_select(dev, cs_dontcare);
536 	mmcbr_set_bus_width(dev, bus_width_1);
537 	mmcbr_set_power_mode(dev, power_off);
538 	mmcbr_set_clock(dev, 0);
539 	mmcbr_set_timing(dev, bus_timing_normal);
540 	mmcbr_update_ios(dev);
541 }
542 
543 static int
544 mmc_select_card(struct mmc_softc *sc, uint16_t rca)
545 {
546 	int flags;
547 
548 	flags = (rca ? MMC_RSP_R1B : MMC_RSP_NONE) | MMC_CMD_AC;
549 	return (mmc_wait_for_command(sc, MMC_SELECT_CARD, (uint32_t)rca << 16,
550 	    flags, NULL, CMD_RETRIES));
551 }
552 
553 static int
554 mmc_switch(struct mmc_softc *sc, uint8_t set, uint8_t index, uint8_t value)
555 {
556 	struct mmc_command cmd;
557 	int err;
558 
559 	cmd.opcode = MMC_SWITCH_FUNC;
560 	cmd.arg = (MMC_SWITCH_FUNC_WR << 24) |
561 	    (index << 16) |
562 	    (value << 8) |
563 	    set;
564 	cmd.flags = MMC_RSP_R1B | MMC_CMD_AC;
565 	cmd.data = NULL;
566 	err = mmc_wait_for_cmd(sc, &cmd, 0);
567 	return (err);
568 }
569 
570 static int
571 mmc_sd_switch(struct mmc_softc *sc, uint8_t mode, uint8_t grp, uint8_t value,
572     uint8_t *res)
573 {
574 	int err;
575 	struct mmc_command cmd;
576 	struct mmc_data data;
577 
578 	memset(&cmd, 0, sizeof(struct mmc_command));
579 	memset(&data, 0, sizeof(struct mmc_data));
580 	memset(res, 0, 64);
581 
582 	cmd.opcode = SD_SWITCH_FUNC;
583 	cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC;
584 	cmd.arg = mode << 31;			/* 0 - check, 1 - set */
585 	cmd.arg |= 0x00FFFFFF;
586 	cmd.arg &= ~(0xF << (grp * 4));
587 	cmd.arg |= value << (grp * 4);
588 	cmd.data = &data;
589 
590 	data.data = res;
591 	data.len = 64;
592 	data.flags = MMC_DATA_READ;
593 
594 	err = mmc_wait_for_cmd(sc, &cmd, CMD_RETRIES);
595 	return (err);
596 }
597 
598 static int
599 mmc_set_card_bus_width(struct mmc_softc *sc, uint16_t rca, int width)
600 {
601 	struct mmc_command cmd;
602 	int err;
603 	uint8_t	value;
604 
605 	if (mmcbr_get_mode(sc->dev) == mode_sd) {
606 		memset(&cmd, 0, sizeof(struct mmc_command));
607 		cmd.opcode = ACMD_SET_BUS_WIDTH;
608 		cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
609 		switch (width) {
610 		case bus_width_1:
611 			cmd.arg = SD_BUS_WIDTH_1;
612 			break;
613 		case bus_width_4:
614 			cmd.arg = SD_BUS_WIDTH_4;
615 			break;
616 		default:
617 			return (MMC_ERR_INVALID);
618 		}
619 		err = mmc_wait_for_app_cmd(sc, rca, &cmd, CMD_RETRIES);
620 	} else {
621 		switch (width) {
622 		case bus_width_1:
623 			value = EXT_CSD_BUS_WIDTH_1;
624 			break;
625 		case bus_width_4:
626 			value = EXT_CSD_BUS_WIDTH_4;
627 			break;
628 		case bus_width_8:
629 			value = EXT_CSD_BUS_WIDTH_8;
630 			break;
631 		default:
632 			return (MMC_ERR_INVALID);
633 		}
634 		err = mmc_switch(sc, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_BUS_WIDTH,
635 		    value);
636 	}
637 	return (err);
638 }
639 
640 static int
641 mmc_set_timing(struct mmc_softc *sc, int timing)
642 {
643 	int err;
644 	uint8_t	value;
645 	u_char switch_res[64];
646 
647 	switch (timing) {
648 	case bus_timing_normal:
649 		value = 0;
650 		break;
651 	case bus_timing_hs:
652 		value = 1;
653 		break;
654 	default:
655 		return (MMC_ERR_INVALID);
656 	}
657 	if (mmcbr_get_mode(sc->dev) == mode_sd)
658 		err = mmc_sd_switch(sc, SD_SWITCH_MODE_SET, SD_SWITCH_GROUP1,
659 		    value, switch_res);
660 	else
661 		err = mmc_switch(sc, EXT_CSD_CMD_SET_NORMAL,
662 		    EXT_CSD_HS_TIMING, value);
663 	return (err);
664 }
665 
666 static int
667 mmc_test_bus_width(struct mmc_softc *sc)
668 {
669 	struct mmc_command cmd;
670 	struct mmc_data data;
671 	int err;
672 	uint8_t buf[8];
673 	uint8_t	p8[8] =   { 0x55, 0xAA, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
674 	uint8_t	p8ok[8] = { 0xAA, 0x55, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
675 	uint8_t	p4[4] =   { 0x5A, 0x00, 0x00, 0x00, };
676 	uint8_t	p4ok[4] = { 0xA5, 0x00, 0x00, 0x00, };
677 
678 	if (mmcbr_get_caps(sc->dev) & MMC_CAP_8_BIT_DATA) {
679 		mmcbr_set_bus_width(sc->dev, bus_width_8);
680 		mmcbr_update_ios(sc->dev);
681 
682 		cmd.opcode = MMC_BUSTEST_W;
683 		cmd.arg = 0;
684 		cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC;
685 		cmd.data = &data;
686 
687 		data.data = p8;
688 		data.len = 8;
689 		data.flags = MMC_DATA_WRITE;
690 		mmc_wait_for_cmd(sc, &cmd, 0);
691 
692 		cmd.opcode = MMC_BUSTEST_R;
693 		cmd.arg = 0;
694 		cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC;
695 		cmd.data = &data;
696 
697 		data.data = buf;
698 		data.len = 8;
699 		data.flags = MMC_DATA_READ;
700 		err = mmc_wait_for_cmd(sc, &cmd, 0);
701 
702 		mmcbr_set_bus_width(sc->dev, bus_width_1);
703 		mmcbr_update_ios(sc->dev);
704 
705 		if (err == MMC_ERR_NONE && memcmp(buf, p8ok, 8) == 0)
706 			return (bus_width_8);
707 	}
708 
709 	if (mmcbr_get_caps(sc->dev) & MMC_CAP_4_BIT_DATA) {
710 		mmcbr_set_bus_width(sc->dev, bus_width_4);
711 		mmcbr_update_ios(sc->dev);
712 
713 		cmd.opcode = MMC_BUSTEST_W;
714 		cmd.arg = 0;
715 		cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC;
716 		cmd.data = &data;
717 
718 		data.data = p4;
719 		data.len = 4;
720 		data.flags = MMC_DATA_WRITE;
721 		mmc_wait_for_cmd(sc, &cmd, 0);
722 
723 		cmd.opcode = MMC_BUSTEST_R;
724 		cmd.arg = 0;
725 		cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC;
726 		cmd.data = &data;
727 
728 		data.data = buf;
729 		data.len = 4;
730 		data.flags = MMC_DATA_READ;
731 		err = mmc_wait_for_cmd(sc, &cmd, 0);
732 
733 		mmcbr_set_bus_width(sc->dev, bus_width_1);
734 		mmcbr_update_ios(sc->dev);
735 
736 		if (err == MMC_ERR_NONE && memcmp(buf, p4ok, 4) == 0)
737 			return (bus_width_4);
738 	}
739 	return (bus_width_1);
740 }
741 
742 static uint32_t
743 mmc_get_bits(uint32_t *bits, int bit_len, int start, int size)
744 {
745 	const int i = (bit_len / 32) - (start / 32) - 1;
746 	const int shift = start & 31;
747 	uint32_t retval = bits[i] >> shift;
748 	if (size + shift > 32)
749 		retval |= bits[i - 1] << (32 - shift);
750 	return (retval & ((1 << size) - 1));
751 }
752 
753 static void
754 mmc_decode_cid_sd(uint32_t *raw_cid, struct mmc_cid *cid)
755 {
756 	int i;
757 
758 	/* There's no version info, so we take it on faith */
759 	memset(cid, 0, sizeof(*cid));
760 	cid->mid = mmc_get_bits(raw_cid, 128, 120, 8);
761 	cid->oid = mmc_get_bits(raw_cid, 128, 104, 16);
762 	for (i = 0; i < 5; i++)
763 		cid->pnm[i] = mmc_get_bits(raw_cid, 128, 96 - i * 8, 8);
764 	cid->pnm[5] = 0;
765 	cid->prv = mmc_get_bits(raw_cid, 128, 56, 8);
766 	cid->psn = mmc_get_bits(raw_cid, 128, 24, 32);
767 	cid->mdt_year = mmc_get_bits(raw_cid, 128, 12, 8) + 2000;
768 	cid->mdt_month = mmc_get_bits(raw_cid, 128, 8, 4);
769 }
770 
771 static void
772 mmc_decode_cid_mmc(uint32_t *raw_cid, struct mmc_cid *cid)
773 {
774 	int i;
775 
776 	/* There's no version info, so we take it on faith */
777 	memset(cid, 0, sizeof(*cid));
778 	cid->mid = mmc_get_bits(raw_cid, 128, 120, 8);
779 	cid->oid = mmc_get_bits(raw_cid, 128, 104, 8);
780 	for (i = 0; i < 6; i++)
781 		cid->pnm[i] = mmc_get_bits(raw_cid, 128, 96 - i * 8, 8);
782 	cid->pnm[6] = 0;
783 	cid->prv = mmc_get_bits(raw_cid, 128, 48, 8);
784 	cid->psn = mmc_get_bits(raw_cid, 128, 16, 32);
785 	cid->mdt_month = mmc_get_bits(raw_cid, 128, 12, 4);
786 	cid->mdt_year = mmc_get_bits(raw_cid, 128, 8, 4) + 1997;
787 }
788 
789 static const int exp[8] = {
790 	1, 10, 100, 1000, 10000, 100000, 1000000, 10000000
791 };
792 static const int mant[16] = {
793 	10, 12, 13, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 70, 80
794 };
795 static const int cur_min[8] = {
796 	500, 1000, 5000, 10000, 25000, 35000, 60000, 100000
797 };
798 static const int cur_max[8] = {
799 	1000, 5000, 10000, 25000, 35000, 45000, 800000, 200000
800 };
801 
802 static void
803 mmc_decode_csd_sd(uint32_t *raw_csd, struct mmc_csd *csd)
804 {
805 	int v;
806 	int m;
807 	int e;
808 
809 	memset(csd, 0, sizeof(*csd));
810 	csd->csd_structure = v = mmc_get_bits(raw_csd, 128, 126, 2);
811 	if (v == 0) {
812 		m = mmc_get_bits(raw_csd, 128, 115, 4);
813 		e = mmc_get_bits(raw_csd, 128, 112, 3);
814 		csd->tacc = exp[e] * mant[m] + 9 / 10;
815 		csd->nsac = mmc_get_bits(raw_csd, 128, 104, 8) * 100;
816 		m = mmc_get_bits(raw_csd, 128, 99, 4);
817 		e = mmc_get_bits(raw_csd, 128, 96, 3);
818 		csd->tran_speed = exp[e] * 10000 * mant[m];
819 		csd->ccc = mmc_get_bits(raw_csd, 128, 84, 12);
820 		csd->read_bl_len = 1 << mmc_get_bits(raw_csd, 128, 80, 4);
821 		csd->read_bl_partial = mmc_get_bits(raw_csd, 128, 79, 1);
822 		csd->write_blk_misalign = mmc_get_bits(raw_csd, 128, 78, 1);
823 		csd->read_blk_misalign = mmc_get_bits(raw_csd, 128, 77, 1);
824 		csd->dsr_imp = mmc_get_bits(raw_csd, 128, 76, 1);
825 		csd->vdd_r_curr_min = cur_min[mmc_get_bits(raw_csd, 128, 59, 3)];
826 		csd->vdd_r_curr_max = cur_max[mmc_get_bits(raw_csd, 128, 56, 3)];
827 		csd->vdd_w_curr_min = cur_min[mmc_get_bits(raw_csd, 128, 53, 3)];
828 		csd->vdd_w_curr_max = cur_max[mmc_get_bits(raw_csd, 128, 50, 3)];
829 		m = mmc_get_bits(raw_csd, 128, 62, 12);
830 		e = mmc_get_bits(raw_csd, 128, 47, 3);
831 		csd->capacity = ((1 + m) << (e + 2)) * csd->read_bl_len;
832 		csd->erase_blk_en = mmc_get_bits(raw_csd, 128, 46, 1);
833 		csd->erase_sector = mmc_get_bits(raw_csd, 128, 39, 7) + 1;
834 		csd->wp_grp_size = mmc_get_bits(raw_csd, 128, 32, 7);
835 		csd->wp_grp_enable = mmc_get_bits(raw_csd, 128, 31, 1);
836 		csd->r2w_factor = 1 << mmc_get_bits(raw_csd, 128, 26, 3);
837 		csd->write_bl_len = 1 << mmc_get_bits(raw_csd, 128, 22, 4);
838 		csd->write_bl_partial = mmc_get_bits(raw_csd, 128, 21, 1);
839 	} else if (v == 1) {
840 		m = mmc_get_bits(raw_csd, 128, 115, 4);
841 		e = mmc_get_bits(raw_csd, 128, 112, 3);
842 		csd->tacc = exp[e] * mant[m] + 9 / 10;
843 		csd->nsac = mmc_get_bits(raw_csd, 128, 104, 8) * 100;
844 		m = mmc_get_bits(raw_csd, 128, 99, 4);
845 		e = mmc_get_bits(raw_csd, 128, 96, 3);
846 		csd->tran_speed = exp[e] * 10000 * mant[m];
847 		csd->ccc = mmc_get_bits(raw_csd, 128, 84, 12);
848 		csd->read_bl_len = 1 << mmc_get_bits(raw_csd, 128, 80, 4);
849 		csd->read_bl_partial = mmc_get_bits(raw_csd, 128, 79, 1);
850 		csd->write_blk_misalign = mmc_get_bits(raw_csd, 128, 78, 1);
851 		csd->read_blk_misalign = mmc_get_bits(raw_csd, 128, 77, 1);
852 		csd->dsr_imp = mmc_get_bits(raw_csd, 128, 76, 1);
853 		csd->capacity = ((uint64_t)mmc_get_bits(raw_csd, 128, 48, 22) + 1) *
854 		    512 * 1024;
855 		csd->erase_blk_en = mmc_get_bits(raw_csd, 128, 46, 1);
856 		csd->erase_sector = mmc_get_bits(raw_csd, 128, 39, 7) + 1;
857 		csd->wp_grp_size = mmc_get_bits(raw_csd, 128, 32, 7);
858 		csd->wp_grp_enable = mmc_get_bits(raw_csd, 128, 31, 1);
859 		csd->r2w_factor = 1 << mmc_get_bits(raw_csd, 128, 26, 3);
860 		csd->write_bl_len = 1 << mmc_get_bits(raw_csd, 128, 22, 4);
861 		csd->write_bl_partial = mmc_get_bits(raw_csd, 128, 21, 1);
862 	} else
863 		panic("unknown SD CSD version");
864 }
865 
866 static void
867 mmc_decode_csd_mmc(uint32_t *raw_csd, struct mmc_csd *csd)
868 {
869 	int m;
870 	int e;
871 
872 	memset(csd, 0, sizeof(*csd));
873 	csd->csd_structure = mmc_get_bits(raw_csd, 128, 126, 2);
874 	csd->spec_vers = mmc_get_bits(raw_csd, 128, 122, 4);
875 	m = mmc_get_bits(raw_csd, 128, 115, 4);
876 	e = mmc_get_bits(raw_csd, 128, 112, 3);
877 	csd->tacc = exp[e] * mant[m] + 9 / 10;
878 	csd->nsac = mmc_get_bits(raw_csd, 128, 104, 8) * 100;
879 	m = mmc_get_bits(raw_csd, 128, 99, 4);
880 	e = mmc_get_bits(raw_csd, 128, 96, 3);
881 	csd->tran_speed = exp[e] * 10000 * mant[m];
882 	csd->ccc = mmc_get_bits(raw_csd, 128, 84, 12);
883 	csd->read_bl_len = 1 << mmc_get_bits(raw_csd, 128, 80, 4);
884 	csd->read_bl_partial = mmc_get_bits(raw_csd, 128, 79, 1);
885 	csd->write_blk_misalign = mmc_get_bits(raw_csd, 128, 78, 1);
886 	csd->read_blk_misalign = mmc_get_bits(raw_csd, 128, 77, 1);
887 	csd->dsr_imp = mmc_get_bits(raw_csd, 128, 76, 1);
888 	csd->vdd_r_curr_min = cur_min[mmc_get_bits(raw_csd, 128, 59, 3)];
889 	csd->vdd_r_curr_max = cur_max[mmc_get_bits(raw_csd, 128, 56, 3)];
890 	csd->vdd_w_curr_min = cur_min[mmc_get_bits(raw_csd, 128, 53, 3)];
891 	csd->vdd_w_curr_max = cur_max[mmc_get_bits(raw_csd, 128, 50, 3)];
892 	m = mmc_get_bits(raw_csd, 128, 62, 12);
893 	e = mmc_get_bits(raw_csd, 128, 47, 3);
894 	csd->capacity = ((1 + m) << (e + 2)) * csd->read_bl_len;
895 	csd->erase_blk_en = 0;
896 	csd->erase_sector = (mmc_get_bits(raw_csd, 128, 42, 5) + 1) *
897 	    (mmc_get_bits(raw_csd, 128, 37, 5) + 1);
898 	csd->wp_grp_size = mmc_get_bits(raw_csd, 128, 32, 5);
899 	csd->wp_grp_enable = mmc_get_bits(raw_csd, 128, 31, 1);
900 	csd->r2w_factor = 1 << mmc_get_bits(raw_csd, 128, 26, 3);
901 	csd->write_bl_len = 1 << mmc_get_bits(raw_csd, 128, 22, 4);
902 	csd->write_bl_partial = mmc_get_bits(raw_csd, 128, 21, 1);
903 }
904 
905 static void
906 mmc_app_decode_scr(uint32_t *raw_scr, struct mmc_scr *scr)
907 {
908 	unsigned int scr_struct;
909 
910 	memset(scr, 0, sizeof(*scr));
911 
912 	scr_struct = mmc_get_bits(raw_scr, 64, 60, 4);
913 	if (scr_struct != 0) {
914 		kprintf("Unrecognised SCR structure version %d\n",
915 		    scr_struct);
916 		return;
917 	}
918 	scr->sda_vsn = mmc_get_bits(raw_scr, 64, 56, 4);
919 	scr->bus_widths = mmc_get_bits(raw_scr, 64, 48, 4);
920 }
921 
922 static void
923 mmc_app_decode_sd_status(uint32_t *raw_sd_status,
924     struct mmc_sd_status *sd_status)
925 {
926 
927 	memset(sd_status, 0, sizeof(*sd_status));
928 
929 	sd_status->bus_width = mmc_get_bits(raw_sd_status, 512, 510, 2);
930 	sd_status->secured_mode = mmc_get_bits(raw_sd_status, 512, 509, 1);
931 	sd_status->card_type = mmc_get_bits(raw_sd_status, 512, 480, 16);
932 	sd_status->prot_area = mmc_get_bits(raw_sd_status, 512, 448, 12);
933 	sd_status->speed_class = mmc_get_bits(raw_sd_status, 512, 440, 8);
934 	sd_status->perf_move = mmc_get_bits(raw_sd_status, 512, 432, 8);
935 	sd_status->au_size = mmc_get_bits(raw_sd_status, 512, 428, 4);
936 	sd_status->erase_size = mmc_get_bits(raw_sd_status, 512, 408, 16);
937 	sd_status->erase_timeout = mmc_get_bits(raw_sd_status, 512, 402, 6);
938 	sd_status->erase_offset = mmc_get_bits(raw_sd_status, 512, 400, 2);
939 }
940 
941 static int
942 mmc_all_send_cid(struct mmc_softc *sc, uint32_t *rawcid)
943 {
944 	struct mmc_command cmd;
945 	int err;
946 
947 	cmd.opcode = MMC_ALL_SEND_CID;
948 	cmd.arg = 0;
949 	cmd.flags = MMC_RSP_R2 | MMC_CMD_BCR;
950 	cmd.data = NULL;
951 	err = mmc_wait_for_cmd(sc, &cmd, 0);
952 	memcpy(rawcid, cmd.resp, 4 * sizeof(uint32_t));
953 	return (err);
954 }
955 
956 static int
957 mmc_send_csd(struct mmc_softc *sc, uint16_t rca, uint32_t *rawcid)
958 {
959 	struct mmc_command cmd;
960 	int err;
961 
962 	cmd.opcode = MMC_SEND_CSD;
963 	cmd.arg = rca << 16;
964 	cmd.flags = MMC_RSP_R2 | MMC_CMD_BCR;
965 	cmd.data = NULL;
966 	err = mmc_wait_for_cmd(sc, &cmd, 0);
967 	memcpy(rawcid, cmd.resp, 4 * sizeof(uint32_t));
968 	return (err);
969 }
970 
971 static int
972 mmc_app_send_scr(struct mmc_softc *sc, uint16_t rca, uint32_t *rawscr)
973 {
974 	int err;
975 	struct mmc_command cmd;
976 	struct mmc_data data;
977 
978 	memset(&cmd, 0, sizeof(struct mmc_command));
979 	memset(&data, 0, sizeof(struct mmc_data));
980 
981 	memset(rawscr, 0, 8);
982 	cmd.opcode = ACMD_SEND_SCR;
983 	cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC;
984 	cmd.arg = 0;
985 	cmd.data = &data;
986 
987 	data.data = rawscr;
988 	data.len = 8;
989 	data.flags = MMC_DATA_READ;
990 
991 	err = mmc_wait_for_app_cmd(sc, rca, &cmd, CMD_RETRIES);
992 	rawscr[0] = be32toh(rawscr[0]);
993 	rawscr[1] = be32toh(rawscr[1]);
994 	return (err);
995 }
996 
997 static int
998 mmc_send_ext_csd(struct mmc_softc *sc, uint8_t *rawextcsd)
999 {
1000 	int err;
1001 	struct mmc_command cmd;
1002 	struct mmc_data data;
1003 
1004 	memset(&cmd, 0, sizeof(struct mmc_command));
1005 	memset(&data, 0, sizeof(struct mmc_data));
1006 
1007 	memset(rawextcsd, 0, 512);
1008 	cmd.opcode = MMC_SEND_EXT_CSD;
1009 	cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC;
1010 	cmd.arg = 0;
1011 	cmd.data = &data;
1012 
1013 	data.data = rawextcsd;
1014 	data.len = 512;
1015 	data.flags = MMC_DATA_READ;
1016 
1017 	err = mmc_wait_for_cmd(sc, &cmd, CMD_RETRIES);
1018 	return (err);
1019 }
1020 
1021 static int
1022 mmc_app_sd_status(struct mmc_softc *sc, uint16_t rca, uint32_t *rawsdstatus)
1023 {
1024 	int err, i;
1025 	struct mmc_command cmd;
1026 	struct mmc_data data;
1027 
1028 	memset(&cmd, 0, sizeof(struct mmc_command));
1029 	memset(&data, 0, sizeof(struct mmc_data));
1030 
1031 	memset(rawsdstatus, 0, 64);
1032 	cmd.opcode = ACMD_SD_STATUS;
1033 	cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC;
1034 	cmd.arg = 0;
1035 	cmd.data = &data;
1036 
1037 	data.data = rawsdstatus;
1038 	data.len = 64;
1039 	data.flags = MMC_DATA_READ;
1040 
1041 	err = mmc_wait_for_app_cmd(sc, rca, &cmd, CMD_RETRIES);
1042 	for (i = 0; i < 16; i++)
1043 	    rawsdstatus[i] = be32toh(rawsdstatus[i]);
1044 	return (err);
1045 }
1046 
1047 static int
1048 mmc_set_relative_addr(struct mmc_softc *sc, uint16_t resp)
1049 {
1050 	struct mmc_command cmd;
1051 	int err;
1052 
1053 	cmd.opcode = MMC_SET_RELATIVE_ADDR;
1054 	cmd.arg = resp << 16;
1055 	cmd.flags = MMC_RSP_R6 | MMC_CMD_BCR;
1056 	cmd.data = NULL;
1057 	err = mmc_wait_for_cmd(sc, &cmd, 0);
1058 	return (err);
1059 }
1060 
1061 static int
1062 mmc_send_relative_addr(struct mmc_softc *sc, uint32_t *resp)
1063 {
1064 	struct mmc_command cmd;
1065 	int err;
1066 
1067 	cmd.opcode = SD_SEND_RELATIVE_ADDR;
1068 	cmd.arg = 0;
1069 	cmd.flags = MMC_RSP_R6 | MMC_CMD_BCR;
1070 	cmd.data = NULL;
1071 	err = mmc_wait_for_cmd(sc, &cmd, 0);
1072 	*resp = cmd.resp[0];
1073 	return (err);
1074 }
1075 
1076 static void
1077 mmc_log_card(device_t dev, struct mmc_ivars *ivar, int newcard)
1078 {
1079 	device_printf(dev, "Card at relative address %d%s:\n",
1080 	    ivar->rca, newcard ? " added" : "");
1081 	device_printf(dev, " card: %s%s (0x%x/0x%x/\"%s\" rev %d.%d "
1082 	    "m/d %02d.%04d s/n %08x)\n",
1083 	    ivar->mode == mode_sd ? "SD" : "MMC",
1084 	    ivar->high_cap ? " High Capacity" : "",
1085 	    ivar->cid.mid, ivar->cid.oid,
1086 	    ivar->cid.pnm, ivar->cid.prv >> 4, ivar->cid.prv & 0x0f,
1087 	    ivar->cid.mdt_month, ivar->cid.mdt_year, ivar->cid.psn);
1088 	device_printf(dev, " bus: %ubit, %uMHz%s\n",
1089 	    (ivar->bus_width == bus_width_1 ? 1 :
1090 	    (ivar->bus_width == bus_width_4 ? 4 : 8)),
1091 	    (ivar->timing == bus_timing_hs ?
1092 		ivar->hs_tran_speed : ivar->tran_speed) / 1000000,
1093 	    ivar->timing == bus_timing_hs ? ", high speed timing" : "");
1094 	device_printf(dev, " memory: %u blocks, erase sector %u blocks%s\n",
1095 	    ivar->sec_count, ivar->erase_sector,
1096 	    ivar->read_only ? ", read-only" : "");
1097 }
1098 
1099 static void
1100 mmc_discover_cards(struct mmc_softc *sc)
1101 {
1102 	struct mmc_ivars *ivar = NULL;
1103 	device_t *devlist;
1104 	int err, i, devcount, newcard;
1105 	uint32_t raw_cid[4];
1106 	uint32_t resp, sec_count;
1107 	device_t child;
1108 	uint16_t rca = 2;
1109 	u_char switch_res[64];
1110 
1111 	if (bootverbose || mmc_debug)
1112 		device_printf(sc->dev, "Probing cards\n");
1113 	while (1) {
1114 		err = mmc_all_send_cid(sc, raw_cid);
1115 		if (err == MMC_ERR_TIMEOUT)
1116 			break;
1117 		if (err != MMC_ERR_NONE) {
1118 			device_printf(sc->dev, "Error reading CID %d\n", err);
1119 			break;
1120 		}
1121 		newcard = 1;
1122 		if ((err = device_get_children(sc->dev, &devlist, &devcount)) != 0)
1123 			return;
1124 		for (i = 0; i < devcount; i++) {
1125 			ivar = device_get_ivars(devlist[i]);
1126 			if (memcmp(ivar->raw_cid, raw_cid, sizeof(raw_cid)) == 0) {
1127 				newcard = 0;
1128 				break;
1129 			}
1130 		}
1131 		kfree(devlist, M_TEMP);
1132 		if (bootverbose || mmc_debug) {
1133 			device_printf(sc->dev, "%sard detected (CID %08x%08x%08x%08x)\n",
1134 			    newcard ? "New c" : "C",
1135 			    raw_cid[0], raw_cid[1], raw_cid[2], raw_cid[3]);
1136 		}
1137 		if (newcard) {
1138 			ivar = kmalloc(sizeof(struct mmc_ivars), M_DEVBUF,
1139 			    M_WAITOK | M_ZERO);
1140 			memcpy(ivar->raw_cid, raw_cid, sizeof(raw_cid));
1141 		}
1142 		if (mmcbr_get_ro(sc->dev))
1143 			ivar->read_only = 1;
1144 		ivar->bus_width = bus_width_1;
1145 		ivar->timing = bus_timing_normal;
1146 		ivar->mode = mmcbr_get_mode(sc->dev);
1147 		if (ivar->mode == mode_sd) {
1148 			mmc_decode_cid_sd(ivar->raw_cid, &ivar->cid);
1149 			mmc_send_relative_addr(sc, &resp);
1150 			ivar->rca = resp >> 16;
1151 			/* Get card CSD. */
1152 			mmc_send_csd(sc, ivar->rca, ivar->raw_csd);
1153 			mmc_decode_csd_sd(ivar->raw_csd, &ivar->csd);
1154 			ivar->sec_count = ivar->csd.capacity / MMC_SECTOR_SIZE;
1155 			if (ivar->csd.csd_structure > 0)
1156 				ivar->high_cap = 1;
1157 			ivar->tran_speed = ivar->csd.tran_speed;
1158 			ivar->erase_sector = ivar->csd.erase_sector *
1159 			    ivar->csd.write_bl_len / MMC_SECTOR_SIZE;
1160 			/* Get card SCR. Card must be selected to fetch it. */
1161 			mmc_select_card(sc, ivar->rca);
1162 			mmc_app_send_scr(sc, ivar->rca, ivar->raw_scr);
1163 			mmc_app_decode_scr(ivar->raw_scr, &ivar->scr);
1164 			/* Get card switch capabilities (command class 10). */
1165 			if ((ivar->scr.sda_vsn >= 1) &&
1166 			    (ivar->csd.ccc & (1<<10))) {
1167 				mmc_sd_switch(sc, SD_SWITCH_MODE_CHECK,
1168 				    SD_SWITCH_GROUP1, SD_SWITCH_NOCHANGE,
1169 				    switch_res);
1170 				if (switch_res[13] & 2) {
1171 					ivar->timing = bus_timing_hs;
1172 					ivar->hs_tran_speed = SD_MAX_HS;
1173 				}
1174 			}
1175 			mmc_app_sd_status(sc, ivar->rca, ivar->raw_sd_status);
1176 			mmc_app_decode_sd_status(ivar->raw_sd_status,
1177 			    &ivar->sd_status);
1178 			if (ivar->sd_status.au_size != 0) {
1179 				ivar->erase_sector =
1180 				    16 << ivar->sd_status.au_size;
1181 			}
1182 			mmc_select_card(sc, 0);
1183 			/* Find max supported bus width. */
1184 			if ((mmcbr_get_caps(sc->dev) & MMC_CAP_4_BIT_DATA) &&
1185 			    (ivar->scr.bus_widths & SD_SCR_BUS_WIDTH_4))
1186 				ivar->bus_width = bus_width_4;
1187 			if (bootverbose || mmc_debug)
1188 				mmc_log_card(sc->dev, ivar, newcard);
1189 			if (newcard) {
1190 				/* Add device. */
1191 				child = device_add_child(sc->dev, NULL, -1);
1192 				device_set_ivars(child, ivar);
1193 			}
1194 			return;
1195 		}
1196 		mmc_decode_cid_mmc(ivar->raw_cid, &ivar->cid);
1197 		ivar->rca = rca++;
1198 		mmc_set_relative_addr(sc, ivar->rca);
1199 		/* Get card CSD. */
1200 		mmc_send_csd(sc, ivar->rca, ivar->raw_csd);
1201 		mmc_decode_csd_mmc(ivar->raw_csd, &ivar->csd);
1202 		ivar->sec_count = ivar->csd.capacity / MMC_SECTOR_SIZE;
1203 		ivar->tran_speed = ivar->csd.tran_speed;
1204 		ivar->erase_sector = ivar->csd.erase_sector *
1205 		    ivar->csd.write_bl_len / MMC_SECTOR_SIZE;
1206 		/* Only MMC >= 4.x cards support EXT_CSD. */
1207 		if (ivar->csd.spec_vers >= 4) {
1208 			/* Card must be selected to fetch EXT_CSD. */
1209 			mmc_select_card(sc, ivar->rca);
1210 			mmc_send_ext_csd(sc, ivar->raw_ext_csd);
1211 			/* Handle extended capacity from EXT_CSD */
1212 			sec_count = ivar->raw_ext_csd[EXT_CSD_SEC_CNT] +
1213 			    (ivar->raw_ext_csd[EXT_CSD_SEC_CNT + 1] << 8) +
1214 			    (ivar->raw_ext_csd[EXT_CSD_SEC_CNT + 2] << 16) +
1215 			    (ivar->raw_ext_csd[EXT_CSD_SEC_CNT + 3] << 24);
1216 			if (sec_count != 0) {
1217 				ivar->sec_count = sec_count;
1218 				ivar->high_cap = 1;
1219 			}
1220 			/* Get card speed in high speed mode. */
1221 			ivar->timing = bus_timing_hs;
1222 			if (ivar->raw_ext_csd[EXT_CSD_CARD_TYPE]
1223 			    & EXT_CSD_CARD_TYPE_52)
1224 				ivar->hs_tran_speed = MMC_TYPE_52_MAX_HS;
1225 			else if (ivar->raw_ext_csd[EXT_CSD_CARD_TYPE]
1226 			    & EXT_CSD_CARD_TYPE_26)
1227 				ivar->hs_tran_speed = MMC_TYPE_26_MAX_HS;
1228 			else
1229 				ivar->hs_tran_speed = ivar->tran_speed;
1230 			/* Find max supported bus width. */
1231 			ivar->bus_width = mmc_test_bus_width(sc);
1232 			mmc_select_card(sc, 0);
1233 			/* Handle HC erase sector size. */
1234 			if (ivar->raw_ext_csd[EXT_CSD_ERASE_GRP_SIZE] != 0) {
1235 				ivar->erase_sector = 1024 *
1236 				    ivar->raw_ext_csd[EXT_CSD_ERASE_GRP_SIZE];
1237 				mmc_switch(sc, EXT_CSD_CMD_SET_NORMAL,
1238 				    EXT_CSD_ERASE_GRP_DEF, 1);
1239 			}
1240 		} else {
1241 			ivar->bus_width = bus_width_1;
1242 			ivar->timing = bus_timing_normal;
1243 		}
1244 		if (bootverbose || mmc_debug)
1245 			mmc_log_card(sc->dev, ivar, newcard);
1246 		if (newcard) {
1247 			/* Add device. */
1248 			child = device_add_child(sc->dev, NULL, -1);
1249 			device_set_ivars(child, ivar);
1250 		}
1251 	}
1252 }
1253 
1254 static void
1255 mmc_rescan_cards(struct mmc_softc *sc)
1256 {
1257 	struct mmc_ivars *ivar = NULL;
1258 	device_t *devlist;
1259 	int err, i, devcount;
1260 
1261 	if ((err = device_get_children(sc->dev, &devlist, &devcount)) != 0)
1262 		return;
1263 	for (i = 0; i < devcount; i++) {
1264 		ivar = device_get_ivars(devlist[i]);
1265 		if (mmc_select_card(sc, ivar->rca)) {
1266 			if (bootverbose || mmc_debug)
1267 				device_printf(sc->dev, "Card at relative address %d lost.\n",
1268 				    ivar->rca);
1269 			device_delete_child(sc->dev, devlist[i]);
1270 			kfree(ivar, M_DEVBUF);
1271 		}
1272 	}
1273 	kfree(devlist, M_TEMP);
1274 	mmc_select_card(sc, 0);
1275 }
1276 
1277 static int
1278 mmc_delete_cards(struct mmc_softc *sc)
1279 {
1280 	struct mmc_ivars *ivar;
1281 	device_t *devlist;
1282 	int err, i, devcount;
1283 
1284 	if ((err = device_get_children(sc->dev, &devlist, &devcount)) != 0)
1285 		return (err);
1286 	for (i = 0; i < devcount; i++) {
1287 		ivar = device_get_ivars(devlist[i]);
1288 		if (bootverbose || mmc_debug)
1289 			device_printf(sc->dev, "Card at relative address %d deleted.\n",
1290 			    ivar->rca);
1291 		device_delete_child(sc->dev, devlist[i]);
1292 		kfree(ivar, M_DEVBUF);
1293 	}
1294 	kfree(devlist, M_TEMP);
1295 	return (0);
1296 }
1297 
1298 static void
1299 mmc_go_discovery(struct mmc_softc *sc)
1300 {
1301 	uint32_t ocr;
1302 	device_t dev;
1303 	int err;
1304 
1305 	dev = sc->dev;
1306 	if (mmcbr_get_power_mode(dev) != power_on) {
1307 		/*
1308 		 * First, try SD modes
1309 		 */
1310 		mmcbr_set_mode(dev, mode_sd);
1311 		mmc_power_up(sc);
1312 		mmcbr_set_bus_mode(dev, pushpull);
1313 		if (bootverbose || mmc_debug)
1314 			device_printf(sc->dev, "Probing bus\n");
1315 		mmc_idle_cards(sc);
1316 		err = mmc_send_if_cond(sc, 1);
1317 		if ((bootverbose || mmc_debug) && err == 0)
1318 			device_printf(sc->dev, "SD 2.0 interface conditions: OK\n");
1319 		if (mmc_send_app_op_cond(sc, err ? 0 : MMC_OCR_CCS, &ocr) !=
1320 		    MMC_ERR_NONE) {
1321 			if (bootverbose || mmc_debug)
1322 				device_printf(sc->dev, "SD probe: failed\n");
1323 			/*
1324 			 * Failed, try MMC
1325 			 */
1326 			mmcbr_set_mode(dev, mode_mmc);
1327 			if (mmc_send_op_cond(sc, 0, &ocr) != MMC_ERR_NONE) {
1328 				if (bootverbose || mmc_debug)
1329 					device_printf(sc->dev, "MMC probe: failed\n");
1330 				ocr = 0; /* Failed both, powerdown. */
1331 			} else if (bootverbose || mmc_debug)
1332 				device_printf(sc->dev,
1333 				    "MMC probe: OK (OCR: 0x%08x)\n", ocr);
1334 		} else if (bootverbose || mmc_debug)
1335 			device_printf(sc->dev, "SD probe: OK (OCR: 0x%08x)\n", ocr);
1336 
1337 		mmcbr_set_ocr(dev, mmc_select_vdd(sc, ocr));
1338 		if (mmcbr_get_ocr(dev) != 0)
1339 			mmc_idle_cards(sc);
1340 	} else {
1341 		mmcbr_set_bus_mode(dev, opendrain);
1342 		mmcbr_set_clock(dev, mmcbr_get_f_min(dev));
1343 		mmcbr_update_ios(dev);
1344 		/* XXX recompute vdd based on new cards? */
1345 	}
1346 	/*
1347 	 * Make sure that we have a mutually agreeable voltage to at least
1348 	 * one card on the bus.
1349 	 */
1350 	if (bootverbose || mmc_debug)
1351 		device_printf(sc->dev, "Current OCR: 0x%08x\n", mmcbr_get_ocr(dev));
1352 	if (mmcbr_get_ocr(dev) == 0) {
1353 		mmc_delete_cards(sc);
1354 		mmc_power_down(sc);
1355 		return;
1356 	}
1357 	/*
1358 	 * Reselect the cards after we've idled them above.
1359 	 */
1360 	if (mmcbr_get_mode(dev) == mode_sd) {
1361 		err = mmc_send_if_cond(sc, 1);
1362 		mmc_send_app_op_cond(sc,
1363 		    (err ? 0 : MMC_OCR_CCS) | mmcbr_get_ocr(dev), NULL);
1364 	} else
1365 		mmc_send_op_cond(sc, mmcbr_get_ocr(dev), NULL);
1366 	mmc_discover_cards(sc);
1367 	mmc_rescan_cards(sc);
1368 
1369 	mmcbr_set_bus_mode(dev, pushpull);
1370 	mmcbr_update_ios(dev);
1371 	mmc_calculate_clock(sc);
1372 	bus_generic_attach(dev);
1373 /*	mmc_update_children_sysctl(dev);*/
1374 }
1375 
1376 static int
1377 mmc_calculate_clock(struct mmc_softc *sc)
1378 {
1379 	int max_dtr, max_hs_dtr, max_timing;
1380 	int nkid, i, f_max;
1381 	device_t *kids;
1382 	struct mmc_ivars *ivar;
1383 
1384 	f_max = mmcbr_get_f_max(sc->dev);
1385 	max_dtr = max_hs_dtr = f_max;
1386 	if ((mmcbr_get_caps(sc->dev) & MMC_CAP_HSPEED))
1387 		max_timing = bus_timing_hs;
1388 	else
1389 		max_timing = bus_timing_normal;
1390 	if (device_get_children(sc->dev, &kids, &nkid) != 0)
1391 		panic("can't get children");
1392 	for (i = 0; i < nkid; i++) {
1393 		ivar = device_get_ivars(kids[i]);
1394 		if (ivar->timing < max_timing)
1395 			max_timing = ivar->timing;
1396 		if (ivar->tran_speed < max_dtr)
1397 			max_dtr = ivar->tran_speed;
1398 		if (ivar->hs_tran_speed < max_hs_dtr)
1399 			max_hs_dtr = ivar->hs_tran_speed;
1400 	}
1401 	for (i = 0; i < nkid; i++) {
1402 		ivar = device_get_ivars(kids[i]);
1403 		if (ivar->timing == bus_timing_normal)
1404 			continue;
1405 		mmc_select_card(sc, ivar->rca);
1406 		mmc_set_timing(sc, max_timing);
1407 	}
1408 	mmc_select_card(sc, 0);
1409 	kfree(kids, M_TEMP);
1410 	if (max_timing == bus_timing_hs)
1411 		max_dtr = max_hs_dtr;
1412 	if (bootverbose || mmc_debug) {
1413 		device_printf(sc->dev,
1414 		    "setting transfer rate to %d.%03dMHz%s\n",
1415 		    max_dtr / 1000000, (max_dtr / 1000) % 1000,
1416 		    max_timing == bus_timing_hs ? " (high speed timing)" : "");
1417 	}
1418 	mmcbr_set_timing(sc->dev, max_timing);
1419 	mmcbr_set_clock(sc->dev, max_dtr);
1420 	mmcbr_update_ios(sc->dev);
1421 	return max_dtr;
1422 }
1423 
1424 static void
1425 mmc_scan(struct mmc_softc *sc)
1426 {
1427 	device_t dev = sc->dev;
1428 
1429 	mmc_acquire_bus(dev, dev);
1430 	mmc_go_discovery(sc);
1431 	mmc_release_bus(dev, dev);
1432 }
1433 
1434 static int
1435 mmc_read_ivar(device_t bus, device_t child, int which, uintptr_t *result)
1436 {
1437 	struct mmc_ivars *ivar = device_get_ivars(child);
1438 
1439 	switch (which) {
1440 	default:
1441 		return (EINVAL);
1442 	case MMC_IVAR_DSR_IMP:
1443 		*(int *)result = ivar->csd.dsr_imp;
1444 		break;
1445 	case MMC_IVAR_MEDIA_SIZE:
1446 		*(off_t *)result = ivar->sec_count;
1447 		break;
1448 	case MMC_IVAR_RCA:
1449 		*(int *)result = ivar->rca;
1450 		break;
1451 	case MMC_IVAR_SECTOR_SIZE:
1452 		*(int *)result = MMC_SECTOR_SIZE;
1453 		break;
1454 	case MMC_IVAR_TRAN_SPEED:
1455 		*(int *)result = mmcbr_get_clock(bus);
1456 		break;
1457 	case MMC_IVAR_READ_ONLY:
1458 		*(int *)result = ivar->read_only;
1459 		break;
1460 	case MMC_IVAR_HIGH_CAP:
1461 		*(int *)result = ivar->high_cap;
1462 		break;
1463 	case MMC_IVAR_CARD_TYPE:
1464 		*(int *)result = ivar->mode;
1465 		break;
1466 	case MMC_IVAR_BUS_WIDTH:
1467 		*(int *)result = ivar->bus_width;
1468 		break;
1469 	case MMC_IVAR_ERASE_SECTOR:
1470 		*(int *)result = ivar->erase_sector;
1471 		break;
1472 	case MMC_IVAR_MAX_DATA:
1473 		*(int *)result = mmcbr_get_max_data(bus);
1474 		break;
1475 	}
1476 	return (0);
1477 }
1478 
1479 static int
1480 mmc_write_ivar(device_t bus, device_t child, int which, uintptr_t value)
1481 {
1482 	/*
1483 	 * None are writable ATM
1484 	 */
1485 	return (EINVAL);
1486 }
1487 
1488 
1489 static void
1490 mmc_delayed_attach(void *xsc)
1491 {
1492 	struct mmc_softc *sc = xsc;
1493 
1494 	mmc_scan(sc);
1495 	config_intrhook_disestablish(&sc->config_intrhook);
1496 }
1497 
1498 static device_method_t mmc_methods[] = {
1499 	/* device_if */
1500 	DEVMETHOD(device_probe, mmc_probe),
1501 	DEVMETHOD(device_attach, mmc_attach),
1502 	DEVMETHOD(device_detach, mmc_detach),
1503 	DEVMETHOD(device_suspend, mmc_suspend),
1504 	DEVMETHOD(device_resume, mmc_resume),
1505 
1506 	/* Bus interface */
1507 	DEVMETHOD(bus_read_ivar, mmc_read_ivar),
1508 	DEVMETHOD(bus_write_ivar, mmc_write_ivar),
1509 
1510 	/* MMC Bus interface */
1511 	DEVMETHOD(mmcbus_wait_for_request, mmc_wait_for_request),
1512 	DEVMETHOD(mmcbus_acquire_bus, mmc_acquire_bus),
1513 	DEVMETHOD(mmcbus_release_bus, mmc_release_bus),
1514 
1515 	DEVMETHOD_END
1516 };
1517 
1518 static driver_t mmc_driver = {
1519 	"mmc",
1520 	mmc_methods,
1521 	sizeof(struct mmc_softc),
1522 };
1523 static devclass_t mmc_devclass;
1524 
1525 
1526 DRIVER_MODULE(mmc, sdhci, mmc_driver, mmc_devclass, NULL, NULL);
1527