1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * linux/drivers/mmc/sdio_ops.c
5 * Copyright 2006-2007 Pierre Ossman
8 #include <linux/scatterlist.h>
10 #include <linux/mmc/host.h>
11 #include <linux/mmc/card.h>
12 #include <linux/mmc/mmc.h>
13 #include <linux/mmc/sdio.h>
18 int mmc_send_io_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr)
20 struct mmc_command cmd = {};
23 cmd.opcode = SD_IO_SEND_OP_COND;
25 cmd.flags = MMC_RSP_SPI_R4 | MMC_RSP_R4 | MMC_CMD_BCR;
27 for (i = 100; i; i--) {
28 err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
32 /* if we're just probing, do a single pass */
36 /* otherwise wait until reset completes */
37 if (mmc_host_is_spi(host)) {
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
44 if (cmd.resp[1] & MMC_CARD_BUSY)
47 if (cmd.resp[0] & MMC_CARD_BUSY)
57 *rocr = cmd.resp[mmc_host_is_spi(host) ? 1 : 0];
62 static int mmc_io_rw_direct_host(struct mmc_host *host, int write, unsigned fn,
63 unsigned addr, u8 in, u8 *out)
65 struct mmc_command cmd = {};
75 cmd.opcode = SD_IO_RW_DIRECT;
76 cmd.arg = write ? 0x80000000 : 0x00000000;
78 cmd.arg |= (write && out) ? 0x08000000 : 0x00000000;
81 cmd.flags = MMC_RSP_SPI_R5 | MMC_RSP_R5 | MMC_CMD_AC;
83 err = mmc_wait_for_cmd(host, &cmd, 0);
87 if (mmc_host_is_spi(host)) {
88 /* host driver already reported errors */
90 if (cmd.resp[0] & R5_ERROR)
92 if (cmd.resp[0] & R5_FUNCTION_NUMBER)
94 if (cmd.resp[0] & R5_OUT_OF_RANGE)
99 if (mmc_host_is_spi(host))
100 *out = (cmd.resp[0] >> 8) & 0xFF;
102 *out = cmd.resp[0] & 0xFF;
108 int mmc_io_rw_direct(struct mmc_card *card, int write, unsigned fn,
109 unsigned addr, u8 in, u8 *out)
111 return mmc_io_rw_direct_host(card->host, write, fn, addr, in, out);
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)
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;
135 cmd.opcode = SD_IO_RW_EXTENDED;
136 cmd.arg = write ? 0x80000000 : 0x00000000;
138 cmd.arg |= incr_addr ? 0x04000000 : 0x00000000;
139 cmd.arg |= addr << 9;
141 cmd.arg |= (blksz == 512) ? 0 : blksz; /* byte mode */
143 cmd.arg |= 0x08000000 | blocks; /* block mode */
144 cmd.flags = MMC_RSP_SPI_R5 | MMC_RSP_R5 | MMC_CMD_ADTC;
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;
151 left_size = data.blksz * data.blocks;
152 nents = DIV_ROUND_UP(left_size, seg_size);
154 if (sg_alloc_table(&sgtable, nents, GFP_KERNEL))
157 data.sg = sgtable.sgl;
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;
169 sg_init_one(&sg, buf, left_size);
172 mmc_set_data_timeout(&data, card);
174 mmc_pre_req(card->host, &mrq);
176 mmc_wait_for_req(card->host, &mrq);
182 else if (mmc_host_is_spi(card->host))
183 /* host driver already reported errors */
185 else if (cmd.resp[0] & R5_ERROR)
187 else if (cmd.resp[0] & R5_FUNCTION_NUMBER)
189 else if (cmd.resp[0] & R5_OUT_OF_RANGE)
194 mmc_post_req(card->host, &mrq, err);
197 sg_free_table(&sgtable);
202 int sdio_reset(struct mmc_host *host)
207 /* SDIO Simplified Specification V2.0, 4.4 Reset for SDIO */
209 ret = mmc_io_rw_direct_host(host, 0, 0, SDIO_CCCR_ABORT, 0, &abort);
215 return mmc_io_rw_direct_host(host, 1, 0, SDIO_CCCR_ABORT, abort, NULL);