xref: /openbmc/linux/drivers/mmc/core/sdio_ops.c (revision 4800cd83)
1 /*
2  *  linux/drivers/mmc/sdio_ops.c
3  *
4  *  Copyright 2006-2007 Pierre Ossman
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License as published by
8  * the Free Software Foundation; either version 2 of the License, or (at
9  * your option) any later version.
10  */
11 
12 #include <linux/scatterlist.h>
13 
14 #include <linux/mmc/host.h>
15 #include <linux/mmc/card.h>
16 #include <linux/mmc/mmc.h>
17 #include <linux/mmc/sdio.h>
18 
19 #include "core.h"
20 #include "sdio_ops.h"
21 
22 int mmc_send_io_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr)
23 {
24 	struct mmc_command cmd;
25 	int i, err = 0;
26 
27 	BUG_ON(!host);
28 
29 	memset(&cmd, 0, sizeof(struct mmc_command));
30 
31 	cmd.opcode = SD_IO_SEND_OP_COND;
32 	cmd.arg = ocr;
33 	cmd.flags = MMC_RSP_SPI_R4 | MMC_RSP_R4 | MMC_CMD_BCR;
34 
35 	for (i = 100; i; i--) {
36 		err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
37 		if (err)
38 			break;
39 
40 		/* if we're just probing, do a single pass */
41 		if (ocr == 0)
42 			break;
43 
44 		/* otherwise wait until reset completes */
45 		if (mmc_host_is_spi(host)) {
46 			/*
47 			 * Both R1_SPI_IDLE and MMC_CARD_BUSY indicate
48 			 * an initialized card under SPI, but some cards
49 			 * (Marvell's) only behave when looking at this
50 			 * one.
51 			 */
52 			if (cmd.resp[1] & MMC_CARD_BUSY)
53 				break;
54 		} else {
55 			if (cmd.resp[0] & MMC_CARD_BUSY)
56 				break;
57 		}
58 
59 		err = -ETIMEDOUT;
60 
61 		mmc_delay(10);
62 	}
63 
64 	if (rocr)
65 		*rocr = cmd.resp[mmc_host_is_spi(host) ? 1 : 0];
66 
67 	return err;
68 }
69 
70 static int mmc_io_rw_direct_host(struct mmc_host *host, int write, unsigned fn,
71 	unsigned addr, u8 in, u8 *out)
72 {
73 	struct mmc_command cmd;
74 	int err;
75 
76 	BUG_ON(!host);
77 	BUG_ON(fn > 7);
78 
79 	/* sanity check */
80 	if (addr & ~0x1FFFF)
81 		return -EINVAL;
82 
83 	memset(&cmd, 0, sizeof(struct mmc_command));
84 
85 	cmd.opcode = SD_IO_RW_DIRECT;
86 	cmd.arg = write ? 0x80000000 : 0x00000000;
87 	cmd.arg |= fn << 28;
88 	cmd.arg |= (write && out) ? 0x08000000 : 0x00000000;
89 	cmd.arg |= addr << 9;
90 	cmd.arg |= in;
91 	cmd.flags = MMC_RSP_SPI_R5 | MMC_RSP_R5 | MMC_CMD_AC;
92 
93 	err = mmc_wait_for_cmd(host, &cmd, 0);
94 	if (err)
95 		return err;
96 
97 	if (mmc_host_is_spi(host)) {
98 		/* host driver already reported errors */
99 	} else {
100 		if (cmd.resp[0] & R5_ERROR)
101 			return -EIO;
102 		if (cmd.resp[0] & R5_FUNCTION_NUMBER)
103 			return -EINVAL;
104 		if (cmd.resp[0] & R5_OUT_OF_RANGE)
105 			return -ERANGE;
106 	}
107 
108 	if (out) {
109 		if (mmc_host_is_spi(host))
110 			*out = (cmd.resp[0] >> 8) & 0xFF;
111 		else
112 			*out = cmd.resp[0] & 0xFF;
113 	}
114 
115 	return 0;
116 }
117 
118 int mmc_io_rw_direct(struct mmc_card *card, int write, unsigned fn,
119 	unsigned addr, u8 in, u8 *out)
120 {
121 	BUG_ON(!card);
122 	return mmc_io_rw_direct_host(card->host, write, fn, addr, in, out);
123 }
124 
125 int mmc_io_rw_extended(struct mmc_card *card, int write, unsigned fn,
126 	unsigned addr, int incr_addr, u8 *buf, unsigned blocks, unsigned blksz)
127 {
128 	struct mmc_request mrq;
129 	struct mmc_command cmd;
130 	struct mmc_data data;
131 	struct scatterlist sg;
132 
133 	BUG_ON(!card);
134 	BUG_ON(fn > 7);
135 	BUG_ON(blocks == 1 && blksz > 512);
136 	WARN_ON(blocks == 0);
137 	WARN_ON(blksz == 0);
138 
139 	/* sanity check */
140 	if (addr & ~0x1FFFF)
141 		return -EINVAL;
142 
143 	memset(&mrq, 0, sizeof(struct mmc_request));
144 	memset(&cmd, 0, sizeof(struct mmc_command));
145 	memset(&data, 0, sizeof(struct mmc_data));
146 
147 	mrq.cmd = &cmd;
148 	mrq.data = &data;
149 
150 	cmd.opcode = SD_IO_RW_EXTENDED;
151 	cmd.arg = write ? 0x80000000 : 0x00000000;
152 	cmd.arg |= fn << 28;
153 	cmd.arg |= incr_addr ? 0x04000000 : 0x00000000;
154 	cmd.arg |= addr << 9;
155 	if (blocks == 1 && blksz <= 512)
156 		cmd.arg |= (blksz == 512) ? 0 : blksz;	/* byte mode */
157 	else
158 		cmd.arg |= 0x08000000 | blocks;		/* block mode */
159 	cmd.flags = MMC_RSP_SPI_R5 | MMC_RSP_R5 | MMC_CMD_ADTC;
160 
161 	data.blksz = blksz;
162 	data.blocks = blocks;
163 	data.flags = write ? MMC_DATA_WRITE : MMC_DATA_READ;
164 	data.sg = &sg;
165 	data.sg_len = 1;
166 
167 	sg_init_one(&sg, buf, blksz * blocks);
168 
169 	mmc_set_data_timeout(&data, card);
170 
171 	mmc_wait_for_req(card->host, &mrq);
172 
173 	if (cmd.error)
174 		return cmd.error;
175 	if (data.error)
176 		return data.error;
177 
178 	if (mmc_host_is_spi(card->host)) {
179 		/* host driver already reported errors */
180 	} else {
181 		if (cmd.resp[0] & R5_ERROR)
182 			return -EIO;
183 		if (cmd.resp[0] & R5_FUNCTION_NUMBER)
184 			return -EINVAL;
185 		if (cmd.resp[0] & R5_OUT_OF_RANGE)
186 			return -ERANGE;
187 	}
188 
189 	return 0;
190 }
191 
192 int sdio_reset(struct mmc_host *host)
193 {
194 	int ret;
195 	u8 abort;
196 
197 	/* SDIO Simplified Specification V2.0, 4.4 Reset for SDIO */
198 
199 	ret = mmc_io_rw_direct_host(host, 0, 0, SDIO_CCCR_ABORT, 0, &abort);
200 	if (ret)
201 		abort = 0x08;
202 	else
203 		abort |= 0x08;
204 
205 	ret = mmc_io_rw_direct_host(host, 1, 0, SDIO_CCCR_ABORT, abort, NULL);
206 	return ret;
207 }
208 
209