aboutsummaryrefslogtreecommitdiff
path: root/drivers/mmc/gen_atmel_mci.c
blob: 4968c5e4912aa46da6b68884e58fc9edda4375f3 (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
/*
 * Copyright (C) 2010
 * Rob Emanuele <rob@emanuele.us>
 * Reinhard Meyer, EMK Elektronik <reinhard.meyer@emk-elektronik.de>
 *
 * Original Driver:
 * Copyright (C) 2004-2006 Atmel Corporation
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * 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., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 */

#include <common.h>
#include <mmc.h>
#include <part.h>
#include <malloc.h>
#include <asm/io.h>
#include <asm/errno.h>
#include <asm/byteorder.h>
#include <asm/arch/clk.h>
#include <asm/arch/hardware.h>
#include "atmel_mci.h"

#ifndef CONFIG_SYS_MMC_CLK_OD
# define CONFIG_SYS_MMC_CLK_OD	150000
#endif

#define MMC_DEFAULT_BLKLEN	512

#if defined(CONFIG_ATMEL_MCI_PORTB)
# define MCI_BUS 1
#else
# define MCI_BUS 0
#endif

static int initialized = 0;

/*
 * Print command and status:
 *
 * - always when DEBUG is defined
 * - on command errors
 */
static void dump_cmd(u32 cmdr, u32 arg, u32 status, const char* msg)
{
	printf("gen_atmel_mci: CMDR %08x (%2u) ARGR %08x (SR: %08x) %s\n",
		cmdr, cmdr&0x3F, arg, status, msg);
}

/* Setup for MCI Clock and Block Size */
static void mci_set_mode(struct mmc *mmc, u32 hz, u32 blklen)
{
	atmel_mci_t *mci = (atmel_mci_t *)mmc->priv;
	u32 bus_hz = get_mci_clk_rate();
	u32 clkdiv = 255;

	debug("mci: bus_hz is %u, setting clock %u Hz, block size %u\n",
		bus_hz, hz, blklen);
	if (hz > 0) {
		/* find lowest clkdiv yielding a rate <= than requested */
		for (clkdiv=0; clkdiv<255; clkdiv++) {
			if ((bus_hz / (clkdiv+1) / 2) <= hz)
				break;
		}
	}
	printf("mci: setting clock %u Hz, block size %u\n",
		(bus_hz / (clkdiv+1)) / 2, blklen);

	blklen &= 0xfffc;
	/* On some platforms RDPROOF and WRPROOF are ignored */
	writel((MMCI_BF(CLKDIV, clkdiv)
		 | MMCI_BF(BLKLEN, blklen)
		 | MMCI_BIT(RDPROOF)
		 | MMCI_BIT(WRPROOF)), &mci->mr);
	initialized = 1;
}

/* Return the CMDR with flags for a given command and data packet */
static u32 mci_encode_cmd(
	struct mmc_cmd *cmd, struct mmc_data *data, u32* error_flags)
{
	u32 cmdr = 0;

	/* Default Flags for Errors */
	*error_flags |= (MMCI_BIT(DTOE) | MMCI_BIT(RDIRE) | MMCI_BIT(RENDE) |
		MMCI_BIT(RINDE) | MMCI_BIT(RTOE));

	/* Default Flags for the Command */
	cmdr |= MMCI_BIT(MAXLAT);

	if (data) {
		cmdr |= MMCI_BF(TRCMD, 1);
		if (data->blocks > 1)
			cmdr |= MMCI_BF(TRTYP, 1);
		if (data->flags & MMC_DATA_READ)
			cmdr |= MMCI_BIT(TRDIR);
	}

	if (cmd->resp_type & MMC_RSP_CRC)
		*error_flags |= MMCI_BIT(RCRCE);
	if (cmd->resp_type & MMC_RSP_136)
		cmdr |= MMCI_BF(RSPTYP, 2);
	else if (cmd->resp_type & MMC_RSP_BUSY)
		cmdr |= MMCI_BF(RSPTYP, 3);
	else if (cmd->resp_type & MMC_RSP_PRESENT)
		cmdr |= MMCI_BF(RSPTYP, 1);

	return cmdr | MMCI_BF(CMDNB, cmd->cmdidx);
}

/* Entered into function pointer in mci_send_cmd */
static u32 mci_data_read(atmel_mci_t *mci, u32* data, u32 error_flags)
{
	u32 status;

	do {
		status = readl(&mci->sr);
		if (status & (error_flags | MMCI_BIT(OVRE)))
			goto io_fail;
	} while (!(status & MMCI_BIT(RXRDY)));

	if (status & MMCI_BIT(RXRDY)) {
		*data = readl(&mci->rdr);
		status = 0;
	}
io_fail:
	return status;
}

/* Entered into function pointer in mci_send_cmd */
static u32 mci_data_write(atmel_mci_t *mci, u32* data, u32 error_flags)
{
	u32 status;

	do {
		status = readl(&mci->sr);
		if (status & (error_flags | MMCI_BIT(UNRE)))
			goto io_fail;
	} while (!(status & MMCI_BIT(TXRDY)));

	if (status & MMCI_BIT(TXRDY)) {
		writel(*data, &mci->tdr);
		status = 0;
	}
io_fail:
	return status;
}

/*
 * Entered into mmc structure during driver init
 *
 * Sends a command out on the bus and deals with the block data.
 * Takes the mmc pointer, a command pointer, and an optional data pointer.
 */
static int
mci_send_cmd(struct mmc *mmc, struct mmc_cmd *cmd, struct mmc_data *data)
{
	atmel_mci_t *mci = (atmel_mci_t *)mmc->priv;
	u32 cmdr;
	u32 error_flags = 0;
	u32 status;

	if (!initialized) {
		puts ("MCI not initialized!\n");
		return COMM_ERR;
	}

	/* Figure out the transfer arguments */
	cmdr = mci_encode_cmd(cmd, data, &error_flags);

	/* Send the command */
	writel(cmd->cmdarg, &mci->argr);
	writel(cmdr, &mci->cmdr);

#ifdef DEBUG
	dump_cmd(cmdr, cmd->cmdarg, 0, "DEBUG");
#endif

	/* Wait for the command to complete */
	while (!((status = readl(&mci->sr)) & MMCI_BIT(CMDRDY)));

	if (status & error_flags) {
		dump_cmd(cmdr, cmd->cmdarg, status, "Command Failed");
		return COMM_ERR;
	}

	/* Copy the response to the response buffer */
	if (cmd->resp_type & MMC_RSP_136) {
		cmd->response[0] = readl(&mci->rspr);
		cmd->response[1] = readl(&mci->rspr1);
		cmd->response[2] = readl(&mci->rspr2);
		cmd->response[3] = readl(&mci->rspr3);
	} else
		cmd->response[0] = readl(&mci->rspr);

	/* transfer all of the blocks */
	if (data) {
		u32 word_count, block_count;
		u32* ioptr;
		u32 sys_blocksize, dummy, i;
		u32 (*mci_data_op)
			(atmel_mci_t *mci, u32* data, u32 error_flags);

		if (data->flags & MMC_DATA_READ) {
			mci_data_op = mci_data_read;
			sys_blocksize = mmc->read_bl_len;
			ioptr = (u32*)data->dest;
		} else {
			mci_data_op = mci_data_write;
			sys_blocksize = mmc->write_bl_len;
			ioptr = (u32*)data->src;
		}

		status = 0;
		for (block_count = 0;
				block_count < data->blocks && !status;
				block_count++) {
			word_count = 0;
			do {
				status = mci_data_op(mci, ioptr, error_flags);
				word_count++;
				ioptr++;
			} while (!status && word_count < (data->blocksize/4));
#ifdef DEBUG
			if (data->flags & MMC_DATA_READ)
			{
				printf("Read Data:\n");
				print_buffer(0, data->dest, 1,
					word_count*4, 0);
			}
#endif
#ifdef DEBUG
			if (!status && word_count < (sys_blocksize / 4))
				printf("filling rest of block...\n");
#endif
			/* fill the rest of a full block */
			while (!status && word_count < (sys_blocksize / 4)) {
				status = mci_data_op(mci, &dummy,
					error_flags);
				word_count++;
			}
			if (status) {
				dump_cmd(cmdr, cmd->cmdarg, status,
					"Data Transfer Failed");
				return COMM_ERR;
			}
		}

		/* Wait for Transfer End */
		i = 0;
		do {
			status = readl(&mci->sr);

			if (status & error_flags) {
				dump_cmd(cmdr, cmd->cmdarg, status,
					"DTIP Wait Failed");
				return COMM_ERR;
			}
			i++;
		} while ((status & MMCI_BIT(DTIP)) && i < 10000);
		if (status & MMCI_BIT(DTIP)) {
			dump_cmd(cmdr, cmd->cmdarg, status,
				"XFER DTIP never unset, ignoring");
		}
	}

	return 0;
}

/* Entered into mmc structure during driver init */
static void mci_set_ios(struct mmc *mmc)
{
	atmel_mci_t *mci = (atmel_mci_t *)mmc->priv;
	int busw = (mmc->bus_width == 4) ? 1 : 0;

	/* Set the clock speed */
	mci_set_mode(mmc, mmc->clock, MMC_DEFAULT_BLKLEN);

	/*
	 * set the bus width and select slot for this interface
	 * there is no capability for multiple slots on the same interface yet
	 * Bitfield SCDBUS needs to be expanded to 2 bits for 8-bit buses
	 */
	writel(MMCI_BF(SCDBUS, busw) | MMCI_BF(SCDSEL, MCI_BUS), &mci->sdcr);
}

/* Entered into mmc structure during driver init */
static int mci_init(struct mmc *mmc)
{
	atmel_mci_t *mci = (atmel_mci_t *)mmc->priv;

	/* Initialize controller */
	writel(MMCI_BIT(SWRST), &mci->cr);	/* soft reset */
	writel(MMCI_BIT(PWSDIS), &mci->cr);	/* disable power save */
	writel(MMCI_BIT(MCIEN), &mci->cr);	/* enable mci */
	writel(MMCI_BF(SCDSEL, MCI_BUS), &mci->sdcr);	/* select port */

	/* Initial Time-outs */
	writel(0x5f, &mci->dtor);
	/* Disable Interrupts */
	writel(~0UL, &mci->idr);

	/* Set default clocks and blocklen */
	mci_set_mode(mmc, CONFIG_SYS_MMC_CLK_OD, MMC_DEFAULT_BLKLEN);

	return 0;
}

/*
 * This is the only exported function
 *
 * Call it with the MCI register base address
 */
int atmel_mci_init(void *regs)
{
	struct mmc *mmc = malloc(sizeof(struct mmc));

	if (!mmc)
		return -1;
	strcpy(mmc->name, "mci");
	mmc->priv = regs;
	mmc->send_cmd = mci_send_cmd;
	mmc->set_ios = mci_set_ios;
	mmc->init = mci_init;
	mmc->getcd = NULL;

	/* need to be able to pass these in on a board by board basis */
	mmc->voltages = MMC_VDD_32_33 | MMC_VDD_33_34;
	mmc->host_caps = MMC_MODE_4BIT;
	/*
	 * min and max frequencies determined by
	 * max and min of clock divider
	 */
	mmc->f_min = get_mci_clk_rate() / (2*256);
	mmc->f_max = get_mci_clk_rate() / (2*1);

	mmc->b_max = 0;

	mmc_register(mmc);

	return 0;
}