summaryrefslogtreecommitdiffstats
path: root/kernel/drivers/mmc/host/ushc.c
blob: d2c386f09d69f4edd20b0ac778624b40f826f1e3 (plain)
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
/*
 * USB SD Host Controller (USHC) controller driver.
 *
 * Copyright (C) 2010 Cambridge Silicon Radio Ltd.
 *
 * 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.
 *
 * Notes:
 *   - Only version 2 devices are supported.
 *   - Version 2 devices only support SDIO cards/devices (R2 response is
 *     unsupported).
 *
 * References:
 *   [USHC] USB SD Host Controller specification (CS-118793-SP)
 */
#include <linux/module.h>
#include <linux/usb.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/dma-mapping.h>
#include <linux/mmc/host.h>

enum ushc_request {
	USHC_GET_CAPS  = 0x00,
	USHC_HOST_CTRL = 0x01,
	USHC_PWR_CTRL  = 0x02,
	USHC_CLK_FREQ  = 0x03,
	USHC_EXEC_CMD  = 0x04,
	USHC_READ_RESP = 0x05,
	USHC_RESET     = 0x06,
};

enum ushc_request_type {
	USHC_GET_CAPS_TYPE  = USB_DIR_IN  | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
	USHC_HOST_CTRL_TYPE = USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
	USHC_PWR_CTRL_TYPE  = USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
	USHC_CLK_FREQ_TYPE  = USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
	USHC_EXEC_CMD_TYPE  = USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
	USHC_READ_RESP_TYPE = USB_DIR_IN  | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
	USHC_RESET_TYPE     = USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
};

#define USHC_GET_CAPS_VERSION_MASK 0xff
#define USHC_GET_CAPS_3V3      (1 << 8)
#define USHC_GET_CAPS_3V0      (1 << 9)
#define USHC_GET_CAPS_1V8      (1 << 10)
#define USHC_GET_CAPS_HIGH_SPD (1 << 16)

#define USHC_HOST_CTRL_4BIT     (1 << 1)
#define USHC_HOST_CTRL_HIGH_SPD (1 << 0)

#define USHC_PWR_CTRL_OFF 0x00
#define USHC_PWR_CTRL_3V3 0x01
#define USHC_PWR_CTRL_3V0 0x02
#define USHC_PWR_CTRL_1V8 0x03

#define USHC_READ_RESP_BUSY        (1 << 4)
#define USHC_READ_RESP_ERR_TIMEOUT (1 << 3)
#define USHC_READ_RESP_ERR_CRC     (1 << 2)
#define USHC_READ_RESP_ERR_DAT     (1 << 1)
#define USHC_READ_RESP_ERR_CMD     (1 << 0)
#define USHC_READ_RESP_ERR_MASK    0x0f

struct ushc_cbw {
	__u8 signature;
	__u8 cmd_idx;
	__le16 block_size;
	__le32 arg;
} __attribute__((packed));

#define USHC_CBW_SIGNATURE 'C'

struct ushc_csw {
	__u8 signature;
	__u8 status;
	__le32 response;
} __attribute__((packed));

#define USHC_CSW_SIGNATURE 'S'

struct ushc_int_data {
	u8 status;
	u8 reserved[3];
};

#define USHC_INT_STATUS_SDIO_INT     (1 << 1)
#define USHC_INT_STATUS_CARD_PRESENT (1 << 0)


struct ushc_data {
	struct usb_device *usb_dev;
	struct mmc_host *mmc;

	struct urb *int_urb;
	struct ushc_int_data *int_data;

	struct urb *cbw_urb;
	struct ushc_cbw *cbw;

	struct urb *data_urb;

	struct urb *csw_urb;
	struct ushc_csw *csw;

	spinlock_t lock;
	struct mmc_request *current_req;
	u32 caps;
	u16 host_ctrl;
	unsigned long flags;
	u8 last_status;
	int clock_freq;
};

#define DISCONNECTED    0
#define INT_EN          1
#define IGNORE_NEXT_INT 2

static void data_callback(struct urb *urb);

static int ushc_hw_reset(struct ushc_data *ushc)
{
	return usb_control_msg(ushc->usb_dev, usb_sndctrlpipe(ushc->usb_dev, 0),
			       USHC_RESET, USHC_RESET_TYPE,
			       0, 0, NULL, 0, 100);
}

static int ushc_hw_get_caps(struct ushc_data *ushc)
{
	int ret;
	int version;

	ret = usb_control_msg(ushc->usb_dev, usb_rcvctrlpipe(ushc->usb_dev, 0),
			      USHC_GET_CAPS, USHC_GET_CAPS_TYPE,
			      0, 0, &ushc->caps, sizeof(ushc->caps), 100);
	if (ret < 0)
		return ret;

	ushc->caps = le32_to_cpu(ushc->caps);

	version = ushc->caps & USHC_GET_CAPS_VERSION_MASK;
	if (version != 0x02) {
		dev_err(&ushc->usb_dev->dev, "controller version %d is not supported\n", version);
		return -EINVAL;
	}

	return 0;
}

static int ushc_hw_set_host_ctrl(struct ushc_data *ushc, u16 mask, u16 val)
{
	u16 host_ctrl;
	int ret;

	host_ctrl = (ushc->host_ctrl & ~mask) | val;
	ret = usb_control_msg(ushc->usb_dev, usb_sndctrlpipe(ushc->usb_dev, 0),
			      USHC_HOST_CTRL, USHC_HOST_CTRL_TYPE,
			      host_ctrl, 0, NULL, 0, 100);
	if (ret < 0)
		return ret;
	ushc->host_ctrl = host_ctrl;
	return 0;
}

static void int_callback(struct urb *urb)
{
	struct ushc_data *ushc = urb->context;
	u8 status, last_status;

	if (urb->status < 0)
		return;

	status = ushc->int_data->status;
	last_status = ushc->last_status;
	ushc->last_status = status;

	/*
	 * Ignore the card interrupt status on interrupt transfers that
	 * were submitted while card interrupts where disabled.
	 *
	 * This avoid occasional spurious interrupts when enabling
	 * interrupts immediately after clearing the source on the card.
	 */

	if (!test_and_clear_bit(IGNORE_NEXT_INT, &ushc->flags)
	    && test_bit(INT_EN, &ushc->flags)
	    && status & USHC_INT_STATUS_SDIO_INT) {
		mmc_signal_sdio_irq(ushc->mmc);
	}

	if ((status ^ last_status) & USHC_INT_STATUS_CARD_PRESENT)
		mmc_detect_change(ushc->mmc, msecs_to_jiffies(100));

	if (!test_bit(INT_EN, &ushc->flags))
		set_bit(IGNORE_NEXT_INT, &ushc->flags);
	usb_submit_urb(ushc->int_urb, GFP_ATOMIC);
}

static void cbw_callback(struct urb *urb)
{
	struct ushc_data *ushc = urb->context;

	if (urb->status != 0) {
		usb_unlink_urb(ushc->data_urb);
		usb_unlink_urb(ushc->csw_urb);
	}
}

static void data_callback(struct urb *urb)
{
	struct ushc_data *ushc = urb->context;

	if (urb->status != 0)
		usb_unlink_urb(ushc->csw_urb);
}

static void csw_callback(struct urb *urb)
{
	struct ushc_data *ushc = urb->context;
	struct mmc_request *req = ushc->current_req;
	int status;

	status = ushc->csw->status;

	if (urb->status != 0) {
		req->cmd->error = urb->status;
	} else if (status & USHC_READ_RESP_ERR_CMD) {
		if (status & USHC_READ_RESP_ERR_CRC)
			req->cmd->error = -EIO;
		else
			req->cmd->error = -ETIMEDOUT;
	}
	if (req->data) {
		if (status & USHC_READ_RESP_ERR_DAT) {
			if (status & USHC_READ_RESP_ERR_CRC)
				req->data->error = -EIO;
			else
				req->data->error = -ETIMEDOUT;
			req->data->bytes_xfered = 0;
		} else {
			req->data->bytes_xfered = req->data->blksz * req->data->blocks;
		}
	}

	req->cmd->resp[0] = le32_to_cpu(ushc->csw->response);

	mmc_request_done(ushc->mmc, req);
}

static void ushc_request(struct mmc_host *mmc, struct mmc_request *req)
{
	struct ushc_data *ushc = mmc_priv(mmc);
	int ret;
	unsigned long flags;

	spin_lock_irqsave(&ushc->lock, flags);

	if (test_bit(DISCONNECTED, &ushc->flags)) {
		ret = -ENODEV;
		goto out;
	}

	/* Version 2 firmware doesn't support the R2 response format. */
	if (req->cmd->flags & MMC_RSP_136) {
		ret = -EINVAL;
		goto out;
	}

	/* The Astoria's data FIFOs don't work with clock speeds < 5MHz so
	   limit commands with data to 6MHz or more. */
	if (req->data && ushc->clock_freq < 6000000) {
		ret = -EINVAL;
		goto out;
	}

	ushc->current_req = req;

	/* Start cmd with CBW. */
	ushc->cbw->cmd_idx = cpu_to_le16(req->cmd->opcode);
	if (req->data)
		ushc->cbw->block_size = cpu_to_le16(req->data->blksz);
	else
		ushc->cbw->block_size = 0;
	ushc->cbw->arg = cpu_to_le32(req->cmd->arg);

	ret = usb_submit_urb(ushc->cbw_urb, GFP_ATOMIC);
	if (ret < 0)
		goto out;

	/* Submit data (if any). */
	if (req->data) {
		struct mmc_data *data = req->data;
		int pipe;

		if (data->flags & MMC_DATA_READ)
			pipe = usb_rcvbulkpipe(ushc->usb_dev, 6);
		else
			pipe = usb_sndbulkpipe(ushc->usb_dev, 2);

		usb_fill_bulk_urb(ushc->data_urb, ushc->usb_dev, pipe,
				  sg_virt(data->sg), data->sg->length,
				  data_callback, ushc);
		ret = usb_submit_urb(ushc->data_urb, GFP_ATOMIC);
		if (ret < 0)
			goto out;
	}

	/* Submit CSW. */
	ret = usb_submit_urb(ushc->csw_urb, GFP_ATOMIC);
	if (ret < 0)
		goto out;

out:
	spin_unlock_irqrestore(&ushc->lock, flags);
	if (ret < 0) {
		usb_unlink_urb(ushc->cbw_urb);
		usb_unlink_urb(ushc->data_urb);
		req->cmd->error = ret;
		mmc_request_done(mmc, req);
	}
}

static int ushc_set_power(struct ushc_data *ushc, unsigned char power_mode)
{
	u16 voltage;

	switch (power_mode) {
	case MMC_POWER_OFF:
		voltage = USHC_PWR_CTRL_OFF;
		break;
	case MMC_POWER_UP:
	case MMC_POWER_ON:
		voltage = USHC_PWR_CTRL_3V3;
		break;
	default:
		return -EINVAL;
	}

	return usb_control_msg(ushc->usb_dev, usb_sndctrlpipe(ushc->usb_dev, 0),
			       USHC_PWR_CTRL, USHC_PWR_CTRL_TYPE,
			       voltage, 0, NULL, 0, 100);
}

static int ushc_set_bus_width(struct ushc_data *ushc, int bus_width)
{
	return ushc_hw_set_host_ctrl(ushc, USHC_HOST_CTRL_4BIT,
				     bus_width == 4 ? USHC_HOST_CTRL_4BIT : 0);
}

static int ushc_set_bus_freq(struct ushc_data *ushc, int clk, bool enable_hs)
{
	int ret;

	/* Hardware can't detect interrupts while the clock is off. */
	if (clk == 0)
		clk = 400000;

	ret = ushc_hw_set_host_ctrl(ushc, USHC_HOST_CTRL_HIGH_SPD,
				    enable_hs ? USHC_HOST_CTRL_HIGH_SPD : 0);
	if (ret < 0)
		return ret;

	ret = usb_control_msg(ushc->usb_dev, usb_sndctrlpipe(ushc->usb_dev, 0),
			      USHC_CLK_FREQ, USHC_CLK_FREQ_TYPE,
			      clk & 0xffff, (clk >> 16) & 0xffff, NULL, 0, 100);
	if (ret < 0)
		return ret;

	ushc->clock_freq = clk;
	return 0;
}

static void ushc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
{
	struct ushc_data *ushc = mmc_priv(mmc);

	ushc_set_power(ushc, ios->power_mode);
	ushc_set_bus_width(ushc, 1 << ios->bus_width);
	ushc_set_bus_freq(ushc, ios->clock, ios->timing == MMC_TIMING_SD_HS);
}

static int ushc_get_cd(struct mmc_host *mmc)
{
	struct ushc_data *ushc = mmc_priv(mmc);

	return !!(ushc->last_status & USHC_INT_STATUS_CARD_PRESENT);
}

static void ushc_enable_sdio_irq(struct mmc_host *mmc, int enable)
{
	struct ushc_data *ushc = mmc_priv(mmc);

	if (enable)
		set_bit(INT_EN, &ushc->flags);
	else
		clear_bit(INT_EN, &ushc->flags);
}

static void ushc_clean_up(struct ushc_data *ushc)
{
	usb_free_urb(ushc->int_urb);
	usb_free_urb(ushc->csw_urb);
	usb_free_urb(ushc->data_urb);
	usb_free_urb(ushc->cbw_urb);

	kfree(ushc->int_data);
	kfree(ushc->cbw);
	kfree(ushc->csw);

	mmc_free_host(ushc->mmc);
}

static const struct mmc_host_ops ushc_ops = {
	.request         = ushc_request,
	.set_ios         = ushc_set_ios,
	.get_cd          = ushc_get_cd,
	.enable_sdio_irq = ushc_enable_sdio_irq,
};

static int ushc_probe(struct usb_interface *intf, const struct usb_device_id *id)
{
	struct usb_device *usb_dev = interface_to_usbdev(intf);
	struct mmc_host *mmc;
	struct ushc_data *ushc;
	int ret;

	mmc = mmc_alloc_host(sizeof(struct ushc_data), &intf->dev);
	if (mmc == NULL)
		return -ENOMEM;
	ushc = mmc_priv(mmc);
	usb_set_intfdata(intf, ushc);

	ushc->usb_dev = usb_dev;
	ushc->mmc = mmc;

	spin_lock_init(&ushc->lock);

	ret = ushc_hw_reset(ushc);
	if (ret < 0)
		goto err;

	/* Read capabilities. */
	ret = ushc_hw_get_caps(ushc);
	if (ret < 0)
		goto err;

	mmc->ops = &ushc_ops;

	mmc->f_min = 400000;
	mmc->f_max = 50000000;
	mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
	mmc->caps = MMC_CAP_4_BIT_DATA | MMC_CAP_SDIO_IRQ;
	mmc->caps |= (ushc->caps & USHC_GET_CAPS_HIGH_SPD) ? MMC_CAP_SD_HIGHSPEED : 0;

	mmc->max_seg_size  = 512*511;
	mmc->max_segs      = 1;
	mmc->max_req_size  = 512*511;
	mmc->max_blk_size  = 512;
	mmc->max_blk_count = 511;

	ushc->int_urb = usb_alloc_urb(0, GFP_KERNEL);
	if (ushc->int_urb == NULL) {
		ret = -ENOMEM;
		goto err;
	}
	ushc->int_data = kzalloc(sizeof(struct ushc_int_data), GFP_KERNEL);
	if (ushc->int_data == NULL) {
		ret = -ENOMEM;
		goto err;
	}
	usb_fill_int_urb(ushc->int_urb, ushc->usb_dev,
			 usb_rcvintpipe(usb_dev,
					intf->cur_altsetting->endpoint[0].desc.bEndpointAddress),
			 ushc->int_data, sizeof(struct ushc_int_data),
			 int_callback, ushc,
			 intf->cur_altsetting->endpoint[0].desc.bInterval);

	ushc->cbw_urb = usb_alloc_urb(0, GFP_KERNEL);
	if (ushc->cbw_urb == NULL) {
		ret = -ENOMEM;
		goto err;
	}
	ushc->cbw = kzalloc(sizeof(struct ushc_cbw), GFP_KERNEL);
	if (ushc->cbw == NULL) {
		ret = -ENOMEM;
		goto err;
	}
	ushc->cbw->signature = USHC_CBW_SIGNATURE;

	usb_fill_bulk_urb(ushc->cbw_urb, ushc->usb_dev, usb_sndbulkpipe(usb_dev, 2),
			  ushc->cbw, sizeof(struct ushc_cbw),
			  cbw_callback, ushc);

	ushc->data_urb = usb_alloc_urb(0, GFP_KERNEL);
	if (ushc->data_urb == NULL) {
		ret = -ENOMEM;
		goto err;
	}

	ushc->csw_urb = usb_alloc_urb(0, GFP_KERNEL);
	if (ushc->csw_urb == NULL) {
		ret = -ENOMEM;
		goto err;
	}
	ushc->csw = kzalloc(sizeof(struct ushc_csw), GFP_KERNEL);
	if (ushc->csw == NULL) {
		ret = -ENOMEM;
		goto err;
	}
	usb_fill_bulk_urb(ushc->csw_urb, ushc->usb_dev, usb_rcvbulkpipe(usb_dev, 6),
			  ushc->csw, sizeof(struct ushc_csw),
			  csw_callback, ushc);

	ret = mmc_add_host(ushc->mmc);
	if (ret)
		goto err;

	ret = usb_submit_urb(ushc->int_urb, GFP_KERNEL);
	if (ret < 0) {
		mmc_remove_host(ushc->mmc);
		goto err;
	}

	return 0;

err:
	ushc_clean_up(ushc);
	return ret;
}

static void ushc_disconnect(struct usb_interface *intf)
{
	struct ushc_data *ushc = usb_get_intfdata(intf);

	spin_lock_irq(&ushc->lock);
	set_bit(DISCONNECTED, &ushc->flags);
	spin_unlock_irq(&ushc->lock);

	usb_kill_urb(ushc->int_urb);
	usb_kill_urb(ushc->cbw_urb);
	usb_kill_urb(ushc->data_urb);
	usb_kill_urb(ushc->csw_urb);

	mmc_remove_host(ushc->mmc);

	ushc_clean_up(ushc);
}

static struct usb_device_id ushc_id_table[] = {
	/* CSR USB SD Host Controller */
	{ USB_DEVICE(0x0a12, 0x5d10) },
	{ },
};
MODULE_DEVICE_TABLE(usb, ushc_id_table);

static struct usb_driver ushc_driver = {
	.name       = "ushc",
	.id_table   = ushc_id_table,
	.probe      = ushc_probe,
	.disconnect = ushc_disconnect,
};

module_usb_driver(ushc_driver);

MODULE_DESCRIPTION("USB SD Host Controller driver");
MODULE_AUTHOR("David Vrabel <david.vrabel@csr.com>");
MODULE_LICENSE("GPL");