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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * linux/drivers/mmc/sdio_ops.c4 *5 * Copyright 2006-2007 Pierre Ossman6 */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 18int 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 indicate40 * an initialized card under SPI, but some cards41 * (Marvell's) only behave when looking at this42 * 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 62static 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 else102 *out = cmd.resp[0] & 0xFF;103 }104 105 return 0;106}107 108int 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 114int 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 else143 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 else192 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 202int 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 else213 abort |= 0x08;214 215 return mmc_io_rw_direct_host(host, 1, 0, SDIO_CCCR_ABORT, abort, NULL);216}217 218