summaryrefslogtreecommitdiffstats
path: root/drivers/mci/pxamci.c
blob: 5ab88b8bebec54565088c283ff22fe4c3d16d211 (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
/*
 *  PXA MCI driver
 *
 * Copyright (C) 2011 Robert Jarzmik
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * Insprired by linux kernel driver
 */

#include <common.h>
#include <errno.h>
#include <io.h>
#include <gpio.h>
#include <clock.h>
#include <init.h>
#include <mci.h>

#include <mach/clock.h>
#include <mach/mci_pxa2xx.h>
#include <mach/pxa-regs.h>
#include "pxamci.h"

#define DRIVER_NAME	"pxa-mmc"

#define RX_TIMEOUT (100 * MSECOND)
#define TX_TIMEOUT (250 * MSECOND)
#define CMD_TIMEOUT (100 * MSECOND)

static void clk_enable(void)
{
	CKEN |= CKEN_MMC;
}

static int pxamci_set_power(struct pxamci_host *host, int on)
{
	mci_dbg("on=%d\n", on);
	if (host->pdata && host->pdata->gpio_power > 0)
		gpio_set_value(host->pdata->gpio_power,
			       !!on ^ host->pdata->gpio_power_invert);
	else if (host->pdata && host->pdata->setpower)
		host->pdata->setpower(&host->mci, on);
	mdelay(250);
	return 0;
}

static void pxamci_start_clock(struct pxamci_host *host)
{
	mmc_writel(START_CLOCK, MMC_STRPCL);
}

static void pxamci_stop_clock(struct pxamci_host *host)
{
	uint64_t start = get_time_ns();
	unsigned stat;

	stat = mmc_readl(MMC_STAT);
	if (stat & STAT_CLK_EN)
		writel(STOP_CLOCK, host->base + MMC_STRPCL);
	while (!is_timeout(start, CMD_TIMEOUT) && stat & STAT_CLK_EN)
		stat = mmc_readl(MMC_STAT);

	if (stat & STAT_CLK_EN)
		mci_err("unable to stop clock\n");
}

static void pxamci_setup_data(struct pxamci_host *host, struct mci_data *data)
{
	static const unsigned int timeout_ns = 1000 * MSECOND; /* 1000 ms */

	mci_dbg("nbblocks=%d, blocksize=%d\n", data->blocks, data->blocksize);
	mmc_writel(data->blocks, MMC_NOB);
	mmc_writel(data->blocksize, MMC_BLKLEN);
	mmc_writel(DIV_ROUND_UP(timeout_ns, 13128), MMC_RDTO);
}

static int pxamci_read_data(struct pxamci_host *host, unsigned char *dst,
			    unsigned len)
{
	int trf_len, trf_len1, trf_len4, ret = 0;
	uint64_t start;
	u32 *dst4;

	mci_dbg("dst=%p, len=%u\n", dst, len);
	while (!ret && len > 0) {
		trf_len = min_t(int, len, MMC_FIFO_LENGTH);

		for (start = get_time_ns(), ret = -ETIMEDOUT;
		     ret && !is_timeout(start, RX_TIMEOUT);)
			if (mmc_readl(MMC_I_REG) & RXFIFO_RD_REQ)
				ret = 0;

		trf_len1 = trf_len % 4;
		trf_len4 = trf_len / 4;
		for (dst4 = (u32 *)dst; !ret && trf_len4 > 0; trf_len4--)
			*dst4++ = mmc_readl(MMC_RXFIFO);
		for (dst = (u8 *)dst4; !ret && trf_len1 > 0; trf_len1--)
			*dst++ = mmc_readb(MMC_RXFIFO);
		len -= trf_len;
	}

	if (!ret)
		for (start = get_time_ns(), ret = -ETIMEDOUT;
		     ret && !is_timeout(start, RX_TIMEOUT);)
			if (mmc_readl(MMC_STAT) & STAT_DATA_TRAN_DONE)
				ret = 0;
	mci_dbg("ret=%d, remain=%d, stat=%x, mmc_i_reg=%x\n",
		ret, len, mmc_readl(MMC_STAT), mmc_readl(MMC_I_REG));
	return ret;
}

static int pxamci_write_data(struct pxamci_host *host, const unsigned char *src,
			    unsigned len)
{
	uint64_t start;
	int trf_len, partial = 0, ret = 0;
	unsigned stat;

	mci_dbg("src=%p, len=%u\n", src, len);
	while (!ret && len > 0) {
		trf_len = min_t(int, len, MMC_FIFO_LENGTH);
		partial = trf_len < MMC_FIFO_LENGTH;

		for (start = get_time_ns(), ret = -ETIMEDOUT;
		     ret && !is_timeout(start, TX_TIMEOUT);)
			if (mmc_readl(MMC_I_REG) & TXFIFO_WR_REQ)
				ret = 0;
		for (; !ret && trf_len > 0; trf_len--, len--)
			mmc_writeb(*src++, MMC_TXFIFO);
		if (partial)
			mmc_writeb(BUF_PART_FULL, MMC_PRTBUF);
	}

	if (!ret)
		for (start = get_time_ns(), ret = -ETIMEDOUT;
		     ret && !is_timeout(start, TX_TIMEOUT);)  {
			stat = mmc_readl(MMC_STAT);
			stat &= STAT_DATA_TRAN_DONE | STAT_PRG_DONE;
			if (stat == (STAT_DATA_TRAN_DONE | STAT_PRG_DONE))
				ret = 0;
		}
	mci_dbg("ret=%d, remain=%d, stat=%x, mmc_i_reg=%x\n",
		ret, len, mmc_readl(MMC_STAT), mmc_readl(MMC_I_REG));
	return ret;
}

static int pxamci_transfer_data(struct pxamci_host *host,
				struct mci_data *data)
{
	int nbbytes = data->blocks * data->blocksize;
	int ret;
	unsigned err_mask = STAT_CRC_READ_ERROR | STAT_CRC_WRITE_ERROR |
		STAT_READ_TIME_OUT;

	if (data->flags & MMC_DATA_WRITE)
		ret = pxamci_write_data(host, data->src, nbbytes);
	else
		ret = pxamci_read_data(host, data->dest, nbbytes);

	if (!ret && (mmc_readl(MMC_STAT) & err_mask))
		ret = -EILSEQ;
	return ret;
}

#define MMC_RSP_MASK (MMC_RSP_PRESENT | MMC_RSP_136 | MMC_RSP_CRC | \
		      MMC_RSP_BUSY | MMC_RSP_OPCODE)
static void pxamci_start_cmd(struct pxamci_host *host, struct mci_cmd *cmd,
			     unsigned int cmdat)
{
	mci_dbg("cmd=(idx=%d,type=%d,clkrt=%d)\n", cmd->cmdidx, cmd->resp_type,
		host->clkrt);

	switch (cmd->resp_type & MMC_RSP_MASK) {
	/* r1, r1b, r6, r7 */
	case MMC_RSP_R1b:
		cmdat |= CMDAT_BUSY;
	case MMC_RSP_R1:
		cmdat |= CMDAT_RESP_SHORT;
		break;
	case MMC_RSP_R2:
		cmdat |= CMDAT_RESP_R2;
		break;
	case MMC_RSP_R3:
		cmdat |= CMDAT_RESP_R3;
		break;
	default:
		break;
	}

	if (cmd->cmdidx == MMC_CMD_STOP_TRANSMISSION)
		cmdat |= CMDAT_STOP_TRAN;

	mmc_writel(cmd->cmdidx, MMC_CMD);
	mmc_writel(cmd->cmdarg >> 16, MMC_ARGH);
	mmc_writel(cmd->cmdarg & 0xffff, MMC_ARGL);
	pxamci_start_clock(host);
	mmc_writel(cmdat, MMC_CMDAT);
}

static int pxamci_cmd_response(struct pxamci_host *host, struct mci_cmd *cmd)
{
	unsigned v, stat;
	int i;

	/*
	 * Did I mention this is Sick.  We always need to
	 * discard the upper 8 bits of the first 16-bit word.
	 */
	v = mmc_readl(MMC_RES) & 0xffff;
	for (i = 0; i < 4; i++) {
		u32 w1 = mmc_readl(MMC_RES) & 0xffff;
		u32 w2 = mmc_readl(MMC_RES) & 0xffff;
		cmd->response[i] = v << 24 | w1 << 8 | w2 >> 8;
		v = w2;
	}

	stat = mmc_readl(MMC_STAT);
	if (stat & STAT_TIME_OUT_RESPONSE)
		return -ETIMEDOUT;
	if (stat & STAT_RES_CRC_ERR && cmd->resp_type & MMC_RSP_CRC) {
		/*
		 * workaround for erratum #42:
		 * Intel PXA27x Family Processor Specification Update Rev 001
		 * A bogus CRC error can appear if the msb of a 136 bit
		 * response is a one.
		 */
		if (cpu_is_pxa27x() && cmd->resp_type & MMC_RSP_136 &&
		    cmd->response[0] & 0x80000000)
			pr_debug("ignoring CRC from command %d - *risky*\n",
				 cmd->cmdidx);
		else
			return -EILSEQ;
	}

	return 0;
}

static int pxamci_mmccmd(struct pxamci_host *host, struct mci_cmd *cmd,
			 struct mci_data *data, unsigned int cmddat)
{
	int ret = 0, stat_mask;
	uint64_t start;

	pxamci_start_cmd(host, cmd, cmddat);

	stat_mask = STAT_END_CMD_RES;
	if (cmd->resp_type & MMC_RSP_BUSY)
		stat_mask |= STAT_PRG_DONE;
	for (start = get_time_ns(), ret = -ETIMEDOUT;
	     ret && !is_timeout(start, CMD_TIMEOUT);)
		if ((mmc_readl(MMC_STAT) & stat_mask) == stat_mask)
			ret = 0;

	if (!ret && data)
		ret = pxamci_transfer_data(host, data);

	if (!ret)
		ret = pxamci_cmd_response(host, cmd);
	return ret;
}

static int pxamci_request(struct mci_host *mci, struct mci_cmd *cmd,
			  struct mci_data *data)
{
	struct pxamci_host *host = to_pxamci(mci);
	unsigned int cmdat;
	int ret;

	cmdat = host->cmdat;
	host->cmdat &= ~CMDAT_INIT;

	if (data) {
		pxamci_setup_data(host, data);

		cmdat &= ~CMDAT_BUSY;
		cmdat |= CMDAT_DATAEN;
		if (data->flags & MMC_DATA_WRITE)
			cmdat |= CMDAT_WRITE;
	}

	ret = pxamci_mmccmd(host, cmd, data, cmdat);
	return ret;
}

static void pxamci_set_ios(struct mci_host *mci, struct mci_ios *ios)
{
	struct pxamci_host *host = to_pxamci(mci);
	unsigned int clk_in = pxa_get_mmcclk();
	int fact;

	mci_dbg("bus_width=%d, clock=%u\n", ios->bus_width, ios->clock);
	if (ios->clock)
		fact = min_t(int, clk_in / ios->clock, 1 << 6);
	else
		fact = 1 << 6;
	fact = max_t(int, fact, 1);

	/*
	 * We calculate clkrt here, and will write it on the next command
	 * MMC card clock = mmcclk / (2 ^ clkrt)
	 */
	/* to handle (19.5MHz, 26MHz) */
	host->clkrt = fls(fact) - 1;

	switch (ios->bus_width) {
	case MMC_BUS_WIDTH_4:
		host->cmdat |= CMDAT_SD_4DAT;
		break;
	case MMC_BUS_WIDTH_1:
		host->cmdat &= ~CMDAT_SD_4DAT;
		break;
	default:
		return;
	}

	host->cmdat |= CMDAT_INIT;

	pxamci_set_power(host, 1);
	pxamci_stop_clock(host);
	mmc_writel(host->clkrt, MMC_CLKRT);
}

static int pxamci_init(struct mci_host *mci, struct device_d *dev)
{
	struct pxamci_host *host = to_pxamci(mci);

	if (host->pdata && host->pdata->init)
		return host->pdata->init(mci, dev);
	return 0;
}

static int pxamci_probe(struct device_d *dev)
{
	struct pxamci_host *host;
	int gpio_power = -1;

	clk_enable();
	host = xzalloc(sizeof(*host));
	host->base = dev_request_mem_region(dev, 0);

	host->mci.init = pxamci_init;
	host->mci.send_cmd = pxamci_request;
	host->mci.set_ios = pxamci_set_ios;
	host->mci.host_caps = MMC_CAP_4_BIT_DATA;
	host->mci.hw_dev = dev;
	host->mci.voltages = MMC_VDD_32_33 | MMC_VDD_33_34;

	/*
	 * Calculate minimum clock rate, rounding up.
	 */
	host->mci.f_min = pxa_get_mmcclk() >> 6;
	host->mci.f_max = pxa_get_mmcclk();

	/*
	 * Ensure that the host controller is shut down, and setup
	 * with our defaults.
	 */
	pxamci_stop_clock(host);
	mmc_writel(0, MMC_SPI);
	mmc_writel(64, MMC_RESTO);
	mmc_writel(0, MMC_I_MASK);

	host->pdata = dev->platform_data;
	if (host->pdata)
		gpio_power = host->pdata->gpio_power;

	if (gpio_power > 0)
		gpio_direction_output(gpio_power,
				      host->pdata->gpio_power_invert);

	mci_register(&host->mci);
	return 0;
}

static struct driver_d pxamci_driver = {
	.name  = DRIVER_NAME,
	.probe = pxamci_probe,
};
device_platform_driver(pxamci_driver);