summaryrefslogtreecommitdiff
path: root/drivers/mmc/jz_mmc.c
blob: edcfbfbce96c07f3bfc4197fd76bbfbe2fd91e9d (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
// SPDX-License-Identifier: GPL-2.0+
/*
 * Ingenic JZ MMC driver
 *
 * Copyright (c) 2013 Imagination Technologies
 * Author: Paul Burton <paul.burton@imgtec.com>
 */

#include <common.h>
#include <malloc.h>
#include <mmc.h>
#include <asm/io.h>
#include <asm/unaligned.h>
#include <errno.h>
#include <dm/device_compat.h>
#include <linux/bitops.h>
#include <linux/delay.h>
#include <mach/jz4780.h>
#include <wait_bit.h>

/* Registers */
#define MSC_STRPCL			0x000
#define MSC_STAT			0x004
#define MSC_CLKRT			0x008
#define MSC_CMDAT			0x00c
#define MSC_RESTO			0x010
#define MSC_RDTO			0x014
#define MSC_BLKLEN			0x018
#define MSC_NOB				0x01c
#define MSC_SNOB			0x020
#define MSC_IMASK			0x024
#define MSC_IREG			0x028
#define MSC_CMD				0x02c
#define MSC_ARG				0x030
#define MSC_RES				0x034
#define MSC_RXFIFO			0x038
#define MSC_TXFIFO			0x03c
#define MSC_LPM				0x040
#define MSC_DMAC			0x044
#define MSC_DMANDA			0x048
#define MSC_DMADA			0x04c
#define MSC_DMALEN			0x050
#define MSC_DMACMD			0x054
#define MSC_CTRL2			0x058
#define MSC_RTCNT			0x05c
#define MSC_DBG				0x0fc

/* MSC Clock and Control Register (MSC_STRPCL) */
#define MSC_STRPCL_EXIT_MULTIPLE	BIT(7)
#define MSC_STRPCL_EXIT_TRANSFER	BIT(6)
#define MSC_STRPCL_START_READWAIT	BIT(5)
#define MSC_STRPCL_STOP_READWAIT	BIT(4)
#define MSC_STRPCL_RESET		BIT(3)
#define MSC_STRPCL_START_OP		BIT(2)
#define MSC_STRPCL_CLOCK_CONTROL_STOP	BIT(0)
#define MSC_STRPCL_CLOCK_CONTROL_START	BIT(1)

/* MSC Status Register (MSC_STAT) */
#define MSC_STAT_AUTO_CMD_DONE		BIT(31)
#define MSC_STAT_IS_RESETTING		BIT(15)
#define MSC_STAT_SDIO_INT_ACTIVE	BIT(14)
#define MSC_STAT_PRG_DONE		BIT(13)
#define MSC_STAT_DATA_TRAN_DONE		BIT(12)
#define MSC_STAT_END_CMD_RES		BIT(11)
#define MSC_STAT_DATA_FIFO_AFULL	BIT(10)
#define MSC_STAT_IS_READWAIT		BIT(9)
#define MSC_STAT_CLK_EN			BIT(8)
#define MSC_STAT_DATA_FIFO_FULL		BIT(7)
#define MSC_STAT_DATA_FIFO_EMPTY	BIT(6)
#define MSC_STAT_CRC_RES_ERR		BIT(5)
#define MSC_STAT_CRC_READ_ERROR		BIT(4)
#define MSC_STAT_CRC_WRITE_ERROR	BIT(2)
#define MSC_STAT_CRC_WRITE_ERROR_NOSTS	BIT(4)
#define MSC_STAT_TIME_OUT_RES		BIT(1)
#define MSC_STAT_TIME_OUT_READ		BIT(0)

/* MSC Bus Clock Control Register (MSC_CLKRT) */
#define MSC_CLKRT_CLK_RATE_MASK		0x7

/* MSC Command Sequence Control Register (MSC_CMDAT) */
#define MSC_CMDAT_IO_ABORT		BIT(11)
#define MSC_CMDAT_BUS_WIDTH_1BIT	(0x0 << 9)
#define MSC_CMDAT_BUS_WIDTH_4BIT	(0x2 << 9)
#define MSC_CMDAT_DMA_EN		BIT(8)
#define MSC_CMDAT_INIT			BIT(7)
#define MSC_CMDAT_BUSY			BIT(6)
#define MSC_CMDAT_STREAM_BLOCK		BIT(5)
#define MSC_CMDAT_WRITE			BIT(4)
#define MSC_CMDAT_DATA_EN		BIT(3)
#define MSC_CMDAT_RESPONSE_MASK		(0x7 << 0)
#define MSC_CMDAT_RESPONSE_NONE		(0x0 << 0) /* No response */
#define MSC_CMDAT_RESPONSE_R1		(0x1 << 0) /* Format R1 and R1b */
#define MSC_CMDAT_RESPONSE_R2		(0x2 << 0) /* Format R2 */
#define MSC_CMDAT_RESPONSE_R3		(0x3 << 0) /* Format R3 */
#define MSC_CMDAT_RESPONSE_R4		(0x4 << 0) /* Format R4 */
#define MSC_CMDAT_RESPONSE_R5		(0x5 << 0) /* Format R5 */
#define MSC_CMDAT_RESPONSE_R6		(0x6 << 0) /* Format R6 */

/* MSC Interrupts Mask Register (MSC_IMASK) */
#define MSC_IMASK_TIME_OUT_RES		BIT(9)
#define MSC_IMASK_TIME_OUT_READ		BIT(8)
#define MSC_IMASK_SDIO			BIT(7)
#define MSC_IMASK_TXFIFO_WR_REQ		BIT(6)
#define MSC_IMASK_RXFIFO_RD_REQ		BIT(5)
#define MSC_IMASK_END_CMD_RES		BIT(2)
#define MSC_IMASK_PRG_DONE		BIT(1)
#define MSC_IMASK_DATA_TRAN_DONE	BIT(0)

/* MSC Interrupts Status Register (MSC_IREG) */
#define MSC_IREG_TIME_OUT_RES		BIT(9)
#define MSC_IREG_TIME_OUT_READ		BIT(8)
#define MSC_IREG_SDIO			BIT(7)
#define MSC_IREG_TXFIFO_WR_REQ		BIT(6)
#define MSC_IREG_RXFIFO_RD_REQ		BIT(5)
#define MSC_IREG_END_CMD_RES		BIT(2)
#define MSC_IREG_PRG_DONE		BIT(1)
#define MSC_IREG_DATA_TRAN_DONE		BIT(0)

struct jz_mmc_plat {
	struct mmc_config cfg;
	struct mmc mmc;
};

struct jz_mmc_priv {
	void __iomem		*regs;
	u32			flags;
/* priv flags */
#define JZ_MMC_BUS_WIDTH_MASK	0x3
#define JZ_MMC_BUS_WIDTH_1	0x0
#define JZ_MMC_BUS_WIDTH_4	0x2
#define JZ_MMC_BUS_WIDTH_8	0x3
#define JZ_MMC_SENT_INIT	BIT(2)
};

static int jz_mmc_clock_rate(void)
{
	return 24000000;
}

#if CONFIG_IS_ENABLED(MMC_WRITE)
static inline void jz_mmc_write_data(struct jz_mmc_priv *priv, struct mmc_data *data)
{
	int sz = DIV_ROUND_UP(data->blocks * data->blocksize, 4);
	const void *buf = data->src;

	while (sz--) {
		u32 val = get_unaligned_le32(buf);

		wait_for_bit_le32(priv->regs + MSC_IREG,
				  MSC_IREG_TXFIFO_WR_REQ,
				  true, 10000, false);
		writel(val, priv->regs + MSC_TXFIFO);
		buf += 4;
	}
}
#else
static void jz_mmc_write_data(struct jz_mmc_priv *priv, struct mmc_data *data)
{}
#endif

static inline int jz_mmc_read_data(struct jz_mmc_priv *priv, struct mmc_data *data)
{
	int sz = data->blocks * data->blocksize;
	void *buf = data->dest;
	u32 stat, val;

	do {
		stat = readl(priv->regs + MSC_STAT);

		if (stat & MSC_STAT_TIME_OUT_READ)
			return -ETIMEDOUT;
		if (stat & MSC_STAT_CRC_READ_ERROR)
			return -EINVAL;
		if (stat & MSC_STAT_DATA_FIFO_EMPTY) {
			udelay(10);
			continue;
		}
		do {
			val = readl(priv->regs + MSC_RXFIFO);
			if (sz == 1)
				*(u8 *)buf = (u8)val;
			else if (sz == 2)
				put_unaligned_le16(val, buf);
			else if (sz >= 4)
				put_unaligned_le32(val, buf);
			buf += 4;
			sz -= 4;
			stat = readl(priv->regs + MSC_STAT);
		} while (!(stat & MSC_STAT_DATA_FIFO_EMPTY));
	} while (!(stat & MSC_STAT_DATA_TRAN_DONE));
	return 0;
}

static int jz_mmc_send_cmd(struct mmc *mmc, struct jz_mmc_priv *priv,
			   struct mmc_cmd *cmd, struct mmc_data *data)
{
	u32 stat, mask, cmdat = 0;
	int i, ret;

	/* stop the clock */
	writel(MSC_STRPCL_CLOCK_CONTROL_STOP, priv->regs + MSC_STRPCL);
	ret = wait_for_bit_le32(priv->regs + MSC_STAT,
				MSC_STAT_CLK_EN, false, 10000, false);
	if (ret)
		return ret;

	writel(0, priv->regs + MSC_DMAC);

	/* setup command */
	writel(cmd->cmdidx, priv->regs + MSC_CMD);
	writel(cmd->cmdarg, priv->regs + MSC_ARG);

	if (data) {
		/* setup data */
		cmdat |= MSC_CMDAT_DATA_EN;
		if (data->flags & MMC_DATA_WRITE)
			cmdat |= MSC_CMDAT_WRITE;

		writel(data->blocks, priv->regs + MSC_NOB);
		writel(data->blocksize, priv->regs + MSC_BLKLEN);
	} else {
		writel(0, priv->regs + MSC_NOB);
		writel(0, priv->regs + MSC_BLKLEN);
	}

	/* setup response */
	switch (cmd->resp_type) {
	case MMC_RSP_NONE:
		break;
	case MMC_RSP_R1:
	case MMC_RSP_R1b:
		cmdat |= MSC_CMDAT_RESPONSE_R1;
		break;
	case MMC_RSP_R2:
		cmdat |= MSC_CMDAT_RESPONSE_R2;
		break;
	case MMC_RSP_R3:
		cmdat |= MSC_CMDAT_RESPONSE_R3;
		break;
	default:
		break;
	}

	if (cmd->resp_type & MMC_RSP_BUSY)
		cmdat |= MSC_CMDAT_BUSY;

	/* set init for the first command only */
	if (!(priv->flags & JZ_MMC_SENT_INIT)) {
		cmdat |= MSC_CMDAT_INIT;
		priv->flags |= JZ_MMC_SENT_INIT;
	}

	cmdat |= (priv->flags & JZ_MMC_BUS_WIDTH_MASK) << 9;

	/* write the data setup */
	writel(cmdat, priv->regs + MSC_CMDAT);

	/* unmask interrupts */
	mask = 0xffffffff & ~(MSC_IMASK_END_CMD_RES | MSC_IMASK_TIME_OUT_RES);
	if (data) {
		mask &= ~MSC_IMASK_DATA_TRAN_DONE;
		if (data->flags & MMC_DATA_WRITE) {
			mask &= ~MSC_IMASK_TXFIFO_WR_REQ;
		} else {
			mask &= ~(MSC_IMASK_RXFIFO_RD_REQ |
				  MSC_IMASK_TIME_OUT_READ);
		}
	}
	writel(mask, priv->regs + MSC_IMASK);

	/* clear interrupts */
	writel(0xffffffff, priv->regs + MSC_IREG);

	/* start the command (& the clock) */
	writel(MSC_STRPCL_START_OP | MSC_STRPCL_CLOCK_CONTROL_START,
	       priv->regs + MSC_STRPCL);

	/* wait for completion */
	for (i = 0; i < 100; i++) {
		stat = readl(priv->regs + MSC_IREG);
		stat &= MSC_IREG_END_CMD_RES | MSC_IREG_TIME_OUT_RES;
		if (stat)
			break;
		mdelay(1);
	}
	writel(stat, priv->regs + MSC_IREG);
	if (stat & MSC_IREG_TIME_OUT_RES)
		return -ETIMEDOUT;

	if (cmd->resp_type & MMC_RSP_PRESENT) {
		/* read the response */
		if (cmd->resp_type & MMC_RSP_136) {
			u16 a, b, c, i;

			a = readw(priv->regs + MSC_RES);
			for (i = 0; i < 4; i++) {
				b = readw(priv->regs + MSC_RES);
				c = readw(priv->regs + MSC_RES);
				cmd->response[i] =
					(a << 24) | (b << 8) | (c >> 8);
				a = c;
			}
		} else {
			cmd->response[0] = readw(priv->regs + MSC_RES) << 24;
			cmd->response[0] |= readw(priv->regs + MSC_RES) << 8;
			cmd->response[0] |= readw(priv->regs + MSC_RES) & 0xff;
		}
	}
	if (data) {
		if (data->flags & MMC_DATA_WRITE)
			jz_mmc_write_data(priv, data);
		else if (data->flags & MMC_DATA_READ) {
			ret = jz_mmc_read_data(priv, data);
			if (ret)
				return ret;
		}
	}

	return 0;
}

static int jz_mmc_set_ios(struct mmc *mmc, struct jz_mmc_priv *priv)
{
	u32 real_rate = jz_mmc_clock_rate();
	u8 clk_div = 0;

	/* calculate clock divide */
	while ((real_rate > mmc->clock) && (clk_div < 7)) {
		real_rate >>= 1;
		clk_div++;
	}
	writel(clk_div & MSC_CLKRT_CLK_RATE_MASK, priv->regs + MSC_CLKRT);

	/* set the bus width for the next command */
	priv->flags &= ~JZ_MMC_BUS_WIDTH_MASK;
	if (mmc->bus_width == 8)
		priv->flags |= JZ_MMC_BUS_WIDTH_8;
	else if (mmc->bus_width == 4)
		priv->flags |= JZ_MMC_BUS_WIDTH_4;
	else
		priv->flags |= JZ_MMC_BUS_WIDTH_1;

	return 0;
}

static int jz_mmc_core_init(struct mmc *mmc)
{
	struct jz_mmc_priv *priv = mmc->priv;
	int ret;

	/* Reset */
	writel(MSC_STRPCL_RESET, priv->regs + MSC_STRPCL);
	ret = wait_for_bit_le32(priv->regs + MSC_STAT,
				MSC_STAT_IS_RESETTING, false, 10000, false);
	if (ret)
		return ret;

	/* Maximum timeouts */
	writel(0xffff, priv->regs + MSC_RESTO);
	writel(0xffffffff, priv->regs + MSC_RDTO);

	/* Enable low power mode */
	writel(0x1, priv->regs + MSC_LPM);

	return 0;
}

#if !CONFIG_IS_ENABLED(DM_MMC)

static int jz_mmc_legacy_send_cmd(struct mmc *mmc, struct mmc_cmd *cmd,
				  struct mmc_data *data)
{
	struct jz_mmc_priv *priv = mmc->priv;

	return jz_mmc_send_cmd(mmc, priv, cmd, data);
}

static int jz_mmc_legacy_set_ios(struct mmc *mmc)
{
	struct jz_mmc_priv *priv = mmc->priv;

	return jz_mmc_set_ios(mmc, priv);
};

static const struct mmc_ops jz_msc_ops = {
	.send_cmd	= jz_mmc_legacy_send_cmd,
	.set_ios	= jz_mmc_legacy_set_ios,
	.init		= jz_mmc_core_init,
};

static struct jz_mmc_priv jz_mmc_priv_static;
static struct jz_mmc_plat jz_mmc_plat_static = {
	.cfg = {
		.name = "MSC",
		.ops = &jz_msc_ops,

		.voltages = MMC_VDD_27_28 | MMC_VDD_28_29 | MMC_VDD_29_30 |
			    MMC_VDD_30_31 | MMC_VDD_31_32 | MMC_VDD_32_33 |
			    MMC_VDD_33_34 | MMC_VDD_34_35 | MMC_VDD_35_36,
		.host_caps = MMC_MODE_4BIT | MMC_MODE_HS_52MHz | MMC_MODE_HS,

		.f_min = 375000,
		.f_max = 48000000,
		.b_max = CONFIG_SYS_MMC_MAX_BLK_COUNT,
	},
};

int jz_mmc_init(void __iomem *base)
{
	struct mmc *mmc;

	jz_mmc_priv_static.regs = base;

	mmc = mmc_create(&jz_mmc_plat_static.cfg, &jz_mmc_priv_static);

	return mmc ? 0 : -ENODEV;
}

#else /* CONFIG_DM_MMC */

#include <dm.h>
DECLARE_GLOBAL_DATA_PTR;

static int jz_mmc_dm_send_cmd(struct udevice *dev, struct mmc_cmd *cmd,
			      struct mmc_data *data)
{
	struct jz_mmc_priv *priv = dev_get_priv(dev);
	struct mmc *mmc = mmc_get_mmc_dev(dev);

	return jz_mmc_send_cmd(mmc, priv, cmd, data);
}

static int jz_mmc_dm_set_ios(struct udevice *dev)
{
	struct jz_mmc_priv *priv = dev_get_priv(dev);
	struct mmc *mmc = mmc_get_mmc_dev(dev);

	return jz_mmc_set_ios(mmc, priv);
};

static const struct dm_mmc_ops jz_msc_ops = {
	.send_cmd	= jz_mmc_dm_send_cmd,
	.set_ios	= jz_mmc_dm_set_ios,
};

static int jz_mmc_ofdata_to_platdata(struct udevice *dev)
{
	struct jz_mmc_priv *priv = dev_get_priv(dev);
	struct jz_mmc_plat *plat = dev_get_plat(dev);
	struct mmc_config *cfg;
	int ret;

	priv->regs = map_physmem(dev_read_addr(dev), 0x100, MAP_NOCACHE);
	cfg = &plat->cfg;

	cfg->name = "MSC";
	cfg->host_caps = MMC_MODE_HS_52MHz | MMC_MODE_HS;

	ret = mmc_of_parse(dev, cfg);
	if (ret < 0) {
		dev_err(dev, "failed to parse host caps\n");
		return ret;
	}

	cfg->f_min = 400000;
	cfg->f_max = 52000000;

	cfg->voltages = MMC_VDD_32_33 | MMC_VDD_33_34 | MMC_VDD_165_195;
	cfg->b_max = CONFIG_SYS_MMC_MAX_BLK_COUNT;

	return 0;
}

static int jz_mmc_bind(struct udevice *dev)
{
	struct jz_mmc_plat *plat = dev_get_plat(dev);

	return mmc_bind(dev, &plat->mmc, &plat->cfg);
}

static int jz_mmc_probe(struct udevice *dev)
{
	struct mmc_uclass_priv *upriv = dev_get_uclass_priv(dev);
	struct jz_mmc_priv *priv = dev_get_priv(dev);
	struct jz_mmc_plat *plat = dev_get_plat(dev);

	plat->mmc.priv = priv;
	upriv->mmc = &plat->mmc;
	return jz_mmc_core_init(&plat->mmc);
}

static const struct udevice_id jz_mmc_ids[] = {
	{ .compatible = "ingenic,jz4780-mmc" },
	{ }
};

U_BOOT_DRIVER(jz_mmc_drv) = {
	.name			= "jz_mmc",
	.id			= UCLASS_MMC,
	.of_match		= jz_mmc_ids,
	.ofdata_to_platdata	= jz_mmc_ofdata_to_platdata,
	.bind			= jz_mmc_bind,
	.probe			= jz_mmc_probe,
	.priv_auto	= sizeof(struct jz_mmc_priv),
	.plat_auto	= sizeof(struct jz_mmc_plat),
	.ops			= &jz_msc_ops,
};
#endif /* CONFIG_DM_MMC */