1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * linux/drivers/mmc/sdio_ops.c
4 *
5 * Copyright 2006-2007 Pierre Ossman
6 */
7
8 #include <linux/scatterlist.h>
9
10 #include <linux/mmc/host.h>
11 #include <linux/mmc/card.h>
12 #include <linux/mmc/mmc.h>
13 #include <linux/mmc/sdio.h>
14
15 #include "core.h"
16 #include "sdio_ops.h"
17
mmc_send_io_op_cond(struct mmc_host * host,u32 ocr,u32 * rocr)18 int mmc_send_io_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr)
19 {
20 struct mmc_command cmd = {};
21 int i, err = 0;
22
23 cmd.opcode = SD_IO_SEND_OP_COND;
24 cmd.arg = ocr;
25 cmd.flags = MMC_RSP_SPI_R4 | MMC_RSP_R4 | MMC_CMD_BCR;
26
27 for (i = 100; i; i--) {
28 err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
29 if (err)
30 break;
31
32 /* if we're just probing, do a single pass */
33 if (ocr == 0)
34 break;
35
36 /* otherwise wait until reset completes */
37 if (mmc_host_is_spi(host)) {
38 /*
39 * Both R1_SPI_IDLE and MMC_CARD_BUSY indicate
40 * an initialized card under SPI, but some cards
41 * (Marvell's) only behave when looking at this
42 * one.
43 */
44 if (cmd.resp[1] & MMC_CARD_BUSY)
45 break;
46 } else {
47 if (cmd.resp[0] & MMC_CARD_BUSY)
48 break;
49 }
50
51 err = -ETIMEDOUT;
52
53 mmc_delay(10);
54 }
55
56 if (rocr)
57 *rocr = cmd.resp[mmc_host_is_spi(host) ? 1 : 0];
58
59 return err;
60 }
61
mmc_io_rw_direct_host(struct mmc_host * host,int write,unsigned fn,unsigned addr,u8 in,u8 * out)62 static int mmc_io_rw_direct_host(struct mmc_host *host, int write, unsigned fn,
63 unsigned addr, u8 in, u8 *out)
64 {
65 struct mmc_command cmd = {};
66 int err;
67
68 if (fn > 7)
69 return -EINVAL;
70
71 /* sanity check */
72 if (addr & ~0x1FFFF)
73 return -EINVAL;
74
75 cmd.opcode = SD_IO_RW_DIRECT;
76 cmd.arg = write ? 0x80000000 : 0x00000000;
77 cmd.arg |= fn << 28;
78 cmd.arg |= (write && out) ? 0x08000000 : 0x00000000;
79 cmd.arg |= addr << 9;
80 cmd.arg |= in;
81 cmd.flags = MMC_RSP_SPI_R5 | MMC_RSP_R5 | MMC_CMD_AC;
82
83 err = mmc_wait_for_cmd(host, &cmd, 0);
84 if (err)
85 return err;
86
87 if (mmc_host_is_spi(host)) {
88 /* host driver already reported errors */
89 } else {
90 if (cmd.resp[0] & R5_ERROR)
91 return -EIO;
92 if (cmd.resp[0] & R5_FUNCTION_NUMBER)
93 return -EINVAL;
94 if (cmd.resp[0] & R5_OUT_OF_RANGE)
95 return -ERANGE;
96 }
97
98 if (out) {
99 if (mmc_host_is_spi(host))
100 *out = (cmd.resp[0] >> 8) & 0xFF;
101 else
102 *out = cmd.resp[0] & 0xFF;
103 }
104
105 return 0;
106 }
107
mmc_io_rw_direct(struct mmc_card * card,int write,unsigned fn,unsigned addr,u8 in,u8 * out)108 int mmc_io_rw_direct(struct mmc_card *card, int write, unsigned fn,
109 unsigned addr, u8 in, u8 *out)
110 {
111 return mmc_io_rw_direct_host(card->host, write, fn, addr, in, out);
112 }
113
mmc_io_rw_extended(struct mmc_card * card,int write,unsigned fn,unsigned addr,int incr_addr,u8 * buf,unsigned blocks,unsigned blksz)114 int mmc_io_rw_extended(struct mmc_card *card, int write, unsigned fn,
115 unsigned addr, int incr_addr, u8 *buf, unsigned blocks, unsigned blksz)
116 {
117 struct mmc_request mrq = {};
118 struct mmc_command cmd = {};
119 struct mmc_data data = {};
120 struct scatterlist sg, *sg_ptr;
121 struct sg_table sgtable;
122 unsigned int nents, left_size, i;
123 unsigned int seg_size = card->host->max_seg_size;
124 int err;
125
126 WARN_ON(blksz == 0);
127
128 /* sanity check */
129 if (addr & ~0x1FFFF)
130 return -EINVAL;
131
132 mrq.cmd = &cmd;
133 mrq.data = &data;
134
135 cmd.opcode = SD_IO_RW_EXTENDED;
136 cmd.arg = write ? 0x80000000 : 0x00000000;
137 cmd.arg |= fn << 28;
138 cmd.arg |= incr_addr ? 0x04000000 : 0x00000000;
139 cmd.arg |= addr << 9;
140 if (blocks == 0)
141 cmd.arg |= (blksz == 512) ? 0 : blksz; /* byte mode */
142 else
143 cmd.arg |= 0x08000000 | blocks; /* block mode */
144 cmd.flags = MMC_RSP_SPI_R5 | MMC_RSP_R5 | MMC_CMD_ADTC;
145
146 data.blksz = blksz;
147 /* Code in host drivers/fwk assumes that "blocks" always is >=1 */
148 data.blocks = blocks ? blocks : 1;
149 data.flags = write ? MMC_DATA_WRITE : MMC_DATA_READ;
150
151 left_size = data.blksz * data.blocks;
152 nents = DIV_ROUND_UP(left_size, seg_size);
153 if (nents > 1) {
154 if (sg_alloc_table(&sgtable, nents, GFP_KERNEL))
155 return -ENOMEM;
156
157 data.sg = sgtable.sgl;
158 data.sg_len = nents;
159
160 for_each_sg(data.sg, sg_ptr, data.sg_len, i) {
161 sg_set_buf(sg_ptr, buf + i * seg_size,
162 min(seg_size, left_size));
163 left_size -= seg_size;
164 }
165 } else {
166 data.sg = &sg;
167 data.sg_len = 1;
168
169 sg_init_one(&sg, buf, left_size);
170 }
171
172 mmc_set_data_timeout(&data, card);
173
174 mmc_pre_req(card->host, &mrq);
175
176 mmc_wait_for_req(card->host, &mrq);
177
178 if (cmd.error)
179 err = cmd.error;
180 else if (data.error)
181 err = data.error;
182 else if (mmc_host_is_spi(card->host))
183 /* host driver already reported errors */
184 err = 0;
185 else if (cmd.resp[0] & R5_ERROR)
186 err = -EIO;
187 else if (cmd.resp[0] & R5_FUNCTION_NUMBER)
188 err = -EINVAL;
189 else if (cmd.resp[0] & R5_OUT_OF_RANGE)
190 err = -ERANGE;
191 else
192 err = 0;
193
194 mmc_post_req(card->host, &mrq, err);
195
196 if (nents > 1)
197 sg_free_table(&sgtable);
198
199 return err;
200 }
201
sdio_reset(struct mmc_host * host)202 int sdio_reset(struct mmc_host *host)
203 {
204 int ret;
205 u8 abort;
206
207 /* SDIO Simplified Specification V2.0, 4.4 Reset for SDIO */
208
209 ret = mmc_io_rw_direct_host(host, 0, 0, SDIO_CCCR_ABORT, 0, &abort);
210 if (ret)
211 abort = 0x08;
212 else
213 abort |= 0x08;
214
215 return mmc_io_rw_direct_host(host, 1, 0, SDIO_CCCR_ABORT, abort, NULL);
216 }
217
218