aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/mmc/host/sdricoh_cs.c
blob: 1df44d966bdb927dc7bc7da7ff1ef5b1ee27a05e (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
/*
 *  sdricoh_cs.c - driver for Ricoh Secure Digital Card Readers that can be
 *     found on some Ricoh RL5c476 II cardbus bridge
 *
 *  Copyright (C) 2006 - 2008 Sascha Sommer <saschasommer@freenet.de>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 */

/*
#define DEBUG
#define VERBOSE_DEBUG
*/
#include <linux/delay.h>
#include <linux/highmem.h>
#include <linux/pci.h>
#include <linux/ioport.h>
#include <linux/scatterlist.h>

#include <pcmcia/cs_types.h>
#include <pcmcia/cs.h>
#include <pcmcia/cistpl.h>
#include <pcmcia/ds.h>
#include <linux/io.h>

#include <linux/mmc/host.h>

#define DRIVER_NAME "sdricoh_cs"

static unsigned int switchlocked;

/* i/o region */
#define SDRICOH_PCI_REGION 0
#define SDRICOH_PCI_REGION_SIZE 0x1000

/* registers */
#define R104_VERSION     0x104
#define R200_CMD         0x200
#define R204_CMD_ARG     0x204
#define R208_DATAIO      0x208
#define R20C_RESP        0x20c
#define R21C_STATUS      0x21c
#define R2E0_INIT        0x2e0
#define R2E4_STATUS_RESP 0x2e4
#define R2F0_RESET       0x2f0
#define R224_MODE        0x224
#define R226_BLOCKSIZE   0x226
#define R228_POWER       0x228
#define R230_DATA        0x230

/* flags for the R21C_STATUS register */
#define STATUS_CMD_FINISHED      0x00000001
#define STATUS_TRANSFER_FINISHED 0x00000004
#define STATUS_CARD_INSERTED     0x00000020
#define STATUS_CARD_LOCKED       0x00000080
#define STATUS_CMD_TIMEOUT       0x00400000
#define STATUS_READY_TO_READ     0x01000000
#define STATUS_READY_TO_WRITE    0x02000000
#define STATUS_BUSY              0x40000000

/* timeouts */
#define INIT_TIMEOUT      100
#define CMD_TIMEOUT       100000
#define TRANSFER_TIMEOUT  100000
#define BUSY_TIMEOUT      32767

/* list of supported pcmcia devices */
static struct pcmcia_device_id pcmcia_ids[] = {
	/* vendor and device strings followed by their crc32 hashes */
	PCMCIA_DEVICE_PROD_ID12("RICOH", "Bay1Controller", 0xd9f522ed,
				0xc3901202),
	PCMCIA_DEVICE_NULL,
};

MODULE_DEVICE_TABLE(pcmcia, pcmcia_ids);

/* mmc privdata */
struct sdricoh_host {
	struct device *dev;
	struct mmc_host *mmc;	/* MMC structure */
	unsigned char __iomem *iobase;
	struct pci_dev *pci_dev;
	int app_cmd;
};

/***************** register i/o helper functions *****************************/

static inline unsigned int sdricoh_readl(struct sdricoh_host *host,
					 unsigned int reg)
{
	unsigned int value = readl(host->iobase + reg);
	dev_vdbg(host->dev, "rl %x 0x%x\n", reg, value);
	return value;
}

static inline void sdricoh_writel(struct sdricoh_host *host, unsigned int reg,
				  unsigned int value)
{
	writel(value, host->iobase + reg);
	dev_vdbg(host->dev, "wl %x 0x%x\n", reg, value);

}

static inline unsigned int sdricoh_readw(struct sdricoh_host *host,
					 unsigned int reg)
{
	unsigned int value = readw(host->iobase + reg);
	dev_vdbg(host->dev, "rb %x 0x%x\n", reg, value);
	return value;
}

static inline void sdricoh_writew(struct sdricoh_host *host, unsigned int reg,
					 unsigned short value)
{
	writew(value, host->iobase + reg);
	dev_vdbg(host->dev, "ww %x 0x%x\n", reg, value);
}

static inline unsigned int sdricoh_readb(struct sdricoh_host *host,
					 unsigned int reg)
{
	unsigned int value = readb(host->iobase + reg);
	dev_vdbg(host->dev, "rb %x 0x%x\n", reg, value);
	return value;
}

static int sdricoh_query_status(struct sdricoh_host *host, unsigned int wanted,
				unsigned int timeout){
	unsigned int loop;
	unsigned int status = 0;
	struct device *dev = host->dev;
	for (loop = 0; loop < timeout; loop++) {
		status = sdricoh_readl(host, R21C_STATUS);
		sdricoh_writel(host, R2E4_STATUS_RESP, status);
		if (status & wanted)
			break;
	}

	if (loop == timeout) {
		dev_err(dev, "query_status: timeout waiting for %x\n", wanted);
		return -ETIMEDOUT;
	}

	/* do not do this check in the loop as some commands fail otherwise */
	if (status & 0x7F0000) {
		dev_err(dev, "waiting for status bit %x failed\n", wanted);
		return -EINVAL;
	}
	return 0;

}

static int sdricoh_mmc_cmd(struct sdricoh_host *host, unsigned char opcode,
			   unsigned int arg)
{
	unsigned int status;
	int result = 0;
	unsigned int loop = 0;
	/* reset status reg? */
	sdricoh_writel(host, R21C_STATUS, 0x18);
	/* fill parameters */
	sdricoh_writel(host, R204_CMD_ARG, arg);
	sdricoh_writel(host, R200_CMD, (0x10000 << 8) | opcode);
	/* wait for command completion */
	if (opcode) {
		for (loop = 0; loop < CMD_TIMEOUT; loop++) {
			status = sdricoh_readl(host, R21C_STATUS);
			sdricoh_writel(host, R2E4_STATUS_RESP, status);
			if (status  & STATUS_CMD_FINISHED)
				break;
		}
		/* don't check for timeout in the loop it is not always
		   reset correctly
		*/
		if (loop == CMD_TIMEOUT || status & STATUS_CMD_TIMEOUT)
			result = -ETIMEDOUT;

	}

	return result;

}

static int sdricoh_reset(struct sdricoh_host *host)
{
	dev_dbg(host->dev, "reset\n");
	sdricoh_writel(host, R2F0_RESET, 0x10001);
	sdricoh_writel(host, R2E0_INIT, 0x10000);
	if (sdricoh_readl(host, R2E0_INIT) != 0x10000)
		return -EIO;
	sdricoh_writel(host, R2E0_INIT, 0x10007);

	sdricoh_writel(host, R224_MODE, 0x2000000);
	sdricoh_writel(host, R228_POWER, 0xe0);


	/* status register ? */
	sdricoh_writel(host, R21C_STATUS, 0x18);

	return 0;
}

static int sdricoh_blockio(struct sdricoh_host *host, int read,
				u8 *buf, int len)
{
	int size;
	u32 data = 0;
	/* wait until the data is available */
	if (read) {
		if (sdricoh_query_status(host, STATUS_READY_TO_READ,
						TRANSFER_TIMEOUT))
			return -ETIMEDOUT;
		sdricoh_writel(host, R21C_STATUS, 0x18);
		/* read data */
		while (len) {
			data = sdricoh_readl(host, R230_DATA);
			size = min(len, 4);
			len -= size;
			while (size) {
				*buf = data & 0xFF;
				buf++;
				data >>= 8;
				size--;
			}
		}
	} else {
		if (sdricoh_query_status(host, STATUS_READY_TO_WRITE,
						TRANSFER_TIMEOUT))
			return -ETIMEDOUT;
		sdricoh_writel(host, R21C_STATUS, 0x18);
		/* write data */
		while (len) {
			size = min(len, 4);
			len -= size;
			while (size) {
				data >>= 8;
				data |= (u32)*buf << 24;
				buf++;
				size--;
			}
			sdricoh_writel(host, R230_DATA, data);
		}
	}

	if (len)
		return -EIO;

	return 0;
}

static void sdricoh_request(struct mmc_host *mmc, struct mmc_request *mrq)
{
	struct sdricoh_host *host = mmc_priv(mmc);
	struct mmc_command *cmd = mrq->cmd;
	struct mmc_data *data = cmd->data;
	struct device *dev = host->dev;
	unsigned char opcode = cmd->opcode;
	int i;

	dev_dbg(dev, "=============================\n");
	dev_dbg(dev, "sdricoh_request opcode=%i\n", opcode);

	sdricoh_writel(host, R21C_STATUS, 0x18);

	/* MMC_APP_CMDs need some special handling */
	if (host->app_cmd) {
		opcode |= 64;
		host->app_cmd = 0;
	} else if (opcode == 55)
		host->app_cmd = 1;

	/* read/write commands seem to require this */
	if (data) {
		sdricoh_writew(host, R226_BLOCKSIZE, data->blksz);
		sdricoh_writel(host, R208_DATAIO, 0);
	}

	cmd->error = sdricoh_mmc_cmd(host, opcode, cmd->arg);

	/* read response buffer */
	if (cmd->flags & MMC_RSP_PRESENT) {
		if (cmd->flags & MMC_RSP_136) {
			/* CRC is stripped so we need to do some shifting. */
			for (i = 0; i < 4; i++) {
				cmd->resp[i] =
				    sdricoh_readl(host,
						  R20C_RESP + (3 - i) * 4) << 8;
				if (i != 3)
					cmd->resp[i] |=
					    sdricoh_readb(host, R20C_RESP +
							  (3 - i) * 4 - 1);
			}
		} else
			cmd->resp[0] = sdricoh_readl(host, R20C_RESP);
	}

	/* transfer data */
	if (data && cmd->error == 0) {
		dev_dbg(dev, "transfer: blksz %i blocks %i sg_len %i "
			"sg length %i\n", data->blksz, data->blocks,
			data->sg_len, data->sg->length);

		/* enter data reading mode */
		sdricoh_writel(host, R21C_STATUS, 0x837f031e);
		for (i = 0; i < data->blocks; i++) {
			size_t len = data->blksz;
			u8 *buf;
			struct page *page;
			int result;
			page = sg_page(data->sg);

			buf = kmap(page) + data->sg->offset + (len * i);
			result =
				sdricoh_blockio(host,
					data->flags & MMC_DATA_READ, buf, len);
			kunmap(page);
			flush_dcache_page(page);
			if (result) {
				dev_err(dev, "sdricoh_request: cmd %i "
					"block transfer failed\n", cmd->opcode);
				cmd->error = result;
				break;
			} else
				data->bytes_xfered += len;
		}

		sdricoh_writel(host, R208_DATAIO, 1);

		if (sdricoh_query_status(host, STATUS_TRANSFER_FINISHED,
					TRANSFER_TIMEOUT)) {
			dev_err(dev, "sdricoh_request: transfer end error\n");
			cmd->error = -EINVAL;
		}
	}
	/* FIXME check busy flag */

	mmc_request_done(mmc, mrq);
	dev_dbg(dev, "=============================\n");
}

static void sdricoh_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
{
	struct sdricoh_host *host = mmc_priv(mmc);
	dev_dbg(host->dev, "set_ios\n");

	if (ios->power_mode == MMC_POWER_ON) {
		sdricoh_writel(host, R228_POWER, 0xc0e0);

		if (ios->bus_width == MMC_BUS_WIDTH_4) {
			sdricoh_writel(host, R224_MODE, 0x2000300);
			sdricoh_writel(host, R228_POWER, 0x40e0);
		} else {
			sdricoh_writel(host, R224_MODE, 0x2000340);
		}

	} else if (ios->power_mode == MMC_POWER_UP) {
		sdricoh_writel(host, R224_MODE, 0x2000320);
		sdricoh_writel(host, R228_POWER, 0xe0);
	}
}

static int sdricoh_get_ro(struct mmc_host *mmc)
{
	struct sdricoh_host *host = mmc_priv(mmc);
	unsigned int status;

	status = sdricoh_readl(host, R21C_STATUS);
	sdricoh_writel(host, R2E4_STATUS_RESP, status);

	/* some notebooks seem to have the locked flag switched */
	if (switchlocked)
		return !(status & STATUS_CARD_LOCKED);

	return (status & STATUS_CARD_LOCKED);
}

static struct mmc_host_ops sdricoh_ops = {
	.request = sdricoh_request,
	.set_ios = sdricoh_set_ios,
	.get_ro = sdricoh_get_ro,
};

/* initialize the control and register it to the mmc framework */
static int sdricoh_init_mmc(struct pci_dev *pci_dev,
			    struct pcmcia_device *pcmcia_dev)
{
	int result = 0;
	void __iomem *iobase = NULL;
	struct mmc_host *mmc = NULL;
	struct sdricoh_host *host = NULL;
	struct device *dev = &pcmcia_dev->dev;
	/* map iomem */
	if (pci_resource_len(pci_dev, SDRICOH_PCI_REGION) !=
	    SDRICOH_PCI_REGION_SIZE) {
		dev_dbg(dev, "unexpected pci resource len\n");
		return -ENODEV;
	}
	iobase =
	    pci_iomap(pci_dev, SDRICOH_PCI_REGION, SDRICOH_PCI_REGION_SIZE);
	if (!iobase) {
		dev_err(dev, "unable to map iobase\n");
		return -ENODEV;
	}
	/* check version? */
	if (readl(iobase + R104_VERSION) != 0x4000) {
		dev_dbg(dev, "no supported mmc controller found\n");
		result = -ENODEV;
		goto err;
	}
	/* allocate privdata */
	mmc = pcmcia_dev->priv =
	    mmc_alloc_host(sizeof(struct sdricoh_host), &pcmcia_dev->dev);
	if (!mmc) {
		dev_err(dev, "mmc_alloc_host failed\n");
		result = -ENOMEM;
		goto err;
	}
	host = mmc_priv(mmc);

	host->iobase = iobase;
	host->dev = dev;
	host->pci_dev = pci_dev;

	mmc->ops = &sdricoh_ops;

	/* FIXME: frequency and voltage handling is done by the controller
	 */
	mmc->f_min = 450000;
	mmc->f_max = 24000000;
	mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
	mmc->caps |= MMC_CAP_4_BIT_DATA;

	mmc->max_seg_size = 1024 * 512;
	mmc->max_blk_size = 512;

	/* reset the controler */
	if (sdricoh_reset(host)) {
		dev_dbg(dev, "could not reset\n");
		result = -EIO;
		goto err;

	}

	result = mmc_add_host(mmc);

	if (!result) {
		dev_dbg(dev, "mmc host registered\n");
		return 0;
	}

err:
	if (iobase)
		iounmap(iobase);
	if (mmc)
		mmc_free_host(mmc);

	return result;
}

/* search for supported mmc controllers */
static int sdricoh_pcmcia_probe(struct pcmcia_device *pcmcia_dev)
{
	struct pci_dev *pci_dev = NULL;

	dev_info(&pcmcia_dev->dev, "Searching MMC controller for pcmcia device"
		" %s %s ...\n", pcmcia_dev->prod_id[0], pcmcia_dev->prod_id[1]);

	/* search pci cardbus bridge that contains the mmc controler */
	/* the io region is already claimed by yenta_socket... */
	while ((pci_dev =
		pci_get_device(PCI_VENDOR_ID_RICOH, PCI_DEVICE_ID_RICOH_RL5C476,
			       pci_dev))) {
		/* try to init the device */
		if (!sdricoh_init_mmc(pci_dev, pcmcia_dev)) {
			dev_info(&pcmcia_dev->dev, "MMC controller found\n");
			return 0;
		}

	}
	dev_err(&pcmcia_dev->dev, "No MMC controller was found.\n");
	return -ENODEV;
}

static void sdricoh_pcmcia_detach(struct pcmcia_device *link)
{
	struct mmc_host *mmc = link->priv;

	dev_dbg(&link->dev, "detach\n");

	/* remove mmc host */
	if (mmc) {
		struct sdricoh_host *host = mmc_priv(mmc);
		mmc_remove_host(mmc);
		pci_iounmap(host->pci_dev, host->iobase);
		pci_dev_put(host->pci_dev);
		mmc_free_host(mmc);
	}
	pcmcia_disable_device(link);

}

#ifdef CONFIG_PM
static int sdricoh_pcmcia_suspend(struct pcmcia_device *link)
{
	struct mmc_host *mmc = link->priv;
	dev_dbg(&link->dev, "suspend\n");
	mmc_suspend_host(mmc, PMSG_SUSPEND);
	return 0;
}

static int sdricoh_pcmcia_resume(struct pcmcia_device *link)
{
	struct mmc_host *mmc = link->priv;
	dev_dbg(&link->dev, "resume\n");
	sdricoh_reset(mmc_priv(mmc));
	mmc_resume_host(mmc);
	return 0;
}
#else
#define sdricoh_pcmcia_suspend NULL
#define sdricoh_pcmcia_resume NULL
#endif

static struct pcmcia_driver sdricoh_driver = {
	.drv = {
		.name = DRIVER_NAME,
		},
	.probe = sdricoh_pcmcia_probe,
	.remove = sdricoh_pcmcia_detach,
	.id_table = pcmcia_ids,
	.suspend = sdricoh_pcmcia_suspend,
	.resume = sdricoh_pcmcia_resume,
};

/*****************************************************************************\
 *                                                                           *
 * Driver init/exit                                                          *
 *                                                                           *
\*****************************************************************************/

static int __init sdricoh_drv_init(void)
{
	return pcmcia_register_driver(&sdricoh_driver);
}

static void __exit sdricoh_drv_exit(void)
{
	pcmcia_unregister_driver(&sdricoh_driver);
}

module_init(sdricoh_drv_init);
module_exit(sdricoh_drv_exit);

module_param(switchlocked, uint, 0444);

MODULE_AUTHOR("Sascha Sommer <saschasommer@freenet.de>");
MODULE_DESCRIPTION("Ricoh PCMCIA Secure Digital Interface driver");
MODULE_LICENSE("GPL");

MODULE_PARM_DESC(switchlocked, "Switch the cards locked status."
		"Use this when unlocked cards are shown readonly (default 0)");