mmc/core/sdio_ops.c

0001 // SPDX-License-Identifier: GPL-2.0-or-later
0002 /*
0003  *  linux/drivers/mmc/sdio_ops.c
0004  *
0005  *  Copyright 2006-2007 Pierre Ossman
0006  */
0007
0008 #include <linux/scatterlist.h>
0009
0010 #include <linux/mmc/host.h>
0011 #include <linux/mmc/card.h>
0012 #include <linux/mmc/mmc.h>
0013 #include <linux/mmc/sdio.h>
0014
0015 #include "core.h"
0016 #include "sdio_ops.h"
0017
0018 int mmc_send_io_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr)
0019 {
0020     struct mmc_command cmd = {};
0021     int i, err = 0;
0022
0023     cmd.opcode = SD_IO_SEND_OP_COND;
0024     cmd.arg = ocr;
0025     cmd.flags = MMC_RSP_SPI_R4 | MMC_RSP_R4 | MMC_CMD_BCR;
0026
0027     for (i = 100; i; i--) {
0028         err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
0029         if (err)
0030             break;
0031
0032         /* if we're just probing, do a single pass */
0033         if (ocr == 0)
0034             break;
0035
0036         /* otherwise wait until reset completes */
0037         if (mmc_host_is_spi(host)) {
0038             /*
0039              * Both R1_SPI_IDLE and MMC_CARD_BUSY indicate
0040              * an initialized card under SPI, but some cards
0041              * (Marvell's) only behave when looking at this
0042              * one.
0043              */
0044             if (cmd.resp[1] & MMC_CARD_BUSY)
0045                 break;
0046         } else {
0047             if (cmd.resp[0] & MMC_CARD_BUSY)
0048                 break;
0049         }
0050
0051         err = -ETIMEDOUT;
0052
0053         mmc_delay(10);
0054     }
0055
0056     if (rocr)
0057         *rocr = cmd.resp[mmc_host_is_spi(host) ? 1 : 0];
0058
0059     return err;
0060 }
0061
0062 static int mmc_io_rw_direct_host(struct mmc_host *host, int write, unsigned fn,
0063     unsigned addr, u8 in, u8 *out)
0064 {
0065     struct mmc_command cmd = {};
0066     int err;
0067
0068     if (fn > 7)
0069         return -EINVAL;
0070
0071     /* sanity check */
0072     if (addr & ~0x1FFFF)
0073         return -EINVAL;
0074
0075     cmd.opcode = SD_IO_RW_DIRECT;
0076     cmd.arg = write ? 0x80000000 : 0x00000000;
0077     cmd.arg |= fn << 28;
0078     cmd.arg |= (write && out) ? 0x08000000 : 0x00000000;
0079     cmd.arg |= addr << 9;
0080     cmd.arg |= in;
0081     cmd.flags = MMC_RSP_SPI_R5 | MMC_RSP_R5 | MMC_CMD_AC;
0082
0083     err = mmc_wait_for_cmd(host, &cmd, 0);
0084     if (err)
0085         return err;
0086
0087     if (mmc_host_is_spi(host)) {
0088         /* host driver already reported errors */
0089     } else {
0090         if (cmd.resp[0] & R5_ERROR)
0091             return -EIO;
0092         if (cmd.resp[0] & R5_FUNCTION_NUMBER)
0093             return -EINVAL;
0094         if (cmd.resp[0] & R5_OUT_OF_RANGE)
0095             return -ERANGE;
0096     }
0097
0098     if (out) {
0099         if (mmc_host_is_spi(host))
0100             *out = (cmd.resp[0] >> 8) & 0xFF;
0101         else
0102             *out = cmd.resp[0] & 0xFF;
0103     }
0104
0105     return 0;
0106 }
0107
0108 int mmc_io_rw_direct(struct mmc_card *card, int write, unsigned fn,
0109     unsigned addr, u8 in, u8 *out)
0110 {
0111     return mmc_io_rw_direct_host(card->host, write, fn, addr, in, out);
0112 }
0113
0114 int mmc_io_rw_extended(struct mmc_card *card, int write, unsigned fn,
0115     unsigned addr, int incr_addr, u8 *buf, unsigned blocks, unsigned blksz)
0116 {
0117     struct mmc_request mrq = {};
0118     struct mmc_command cmd = {};
0119     struct mmc_data data = {};
0120     struct scatterlist sg, *sg_ptr;
0121     struct sg_table sgtable;
0122     unsigned int nents, left_size, i;
0123     unsigned int seg_size = card->host->max_seg_size;
0124     int err;
0125
0126     WARN_ON(blksz == 0);
0127
0128     /* sanity check */
0129     if (addr & ~0x1FFFF)
0130         return -EINVAL;
0131
0132     mrq.cmd = &cmd;
0133     mrq.data = &data;
0134
0135     cmd.opcode = SD_IO_RW_EXTENDED;
0136     cmd.arg = write ? 0x80000000 : 0x00000000;
0137     cmd.arg |= fn << 28;
0138     cmd.arg |= incr_addr ? 0x04000000 : 0x00000000;
0139     cmd.arg |= addr << 9;
0140     if (blocks == 0)
0141         cmd.arg |= (blksz == 512) ? 0 : blksz;  /* byte mode */
0142     else
0143         cmd.arg |= 0x08000000 | blocks;     /* block mode */
0144     cmd.flags = MMC_RSP_SPI_R5 | MMC_RSP_R5 | MMC_CMD_ADTC;
0145
0146     data.blksz = blksz;
0147     /* Code in host drivers/fwk assumes that "blocks" always is >=1 */
0148     data.blocks = blocks ? blocks : 1;
0149     data.flags = write ? MMC_DATA_WRITE : MMC_DATA_READ;
0150
0151     left_size = data.blksz * data.blocks;
0152     nents = DIV_ROUND_UP(left_size, seg_size);
0153     if (nents > 1) {
0154         if (sg_alloc_table(&sgtable, nents, GFP_KERNEL))
0155             return -ENOMEM;
0156
0157         data.sg = sgtable.sgl;
0158         data.sg_len = nents;
0159
0160         for_each_sg(data.sg, sg_ptr, data.sg_len, i) {
0161             sg_set_buf(sg_ptr, buf + i * seg_size,
0162                    min(seg_size, left_size));
0163             left_size -= seg_size;
0164         }
0165     } else {
0166         data.sg = &sg;
0167         data.sg_len = 1;
0168
0169         sg_init_one(&sg, buf, left_size);
0170     }
0171
0172     mmc_set_data_timeout(&data, card);
0173
0174     mmc_pre_req(card->host, &mrq);
0175
0176     mmc_wait_for_req(card->host, &mrq);
0177
0178     if (cmd.error)
0179         err = cmd.error;
0180     else if (data.error)
0181         err = data.error;
0182     else if (mmc_host_is_spi(card->host))
0183         /* host driver already reported errors */
0184         err = 0;
0185     else if (cmd.resp[0] & R5_ERROR)
0186         err = -EIO;
0187     else if (cmd.resp[0] & R5_FUNCTION_NUMBER)
0188         err = -EINVAL;
0189     else if (cmd.resp[0] & R5_OUT_OF_RANGE)
0190         err = -ERANGE;
0191     else
0192         err = 0;
0193
0194     mmc_post_req(card->host, &mrq, err);
0195
0196     if (nents > 1)
0197         sg_free_table(&sgtable);
0198
0199     return err;
0200 }
0201
0202 int sdio_reset(struct mmc_host *host)
0203 {
0204     int ret;
0205     u8 abort;
0206
0207     /* SDIO Simplified Specification V2.0, 4.4 Reset for SDIO */
0208
0209     ret = mmc_io_rw_direct_host(host, 0, 0, SDIO_CCCR_ABORT, 0, &abort);
0210     if (ret)
0211         abort = 0x08;
0212     else
0213         abort |= 0x08;
0214
0215     return mmc_io_rw_direct_host(host, 1, 0, SDIO_CCCR_ABORT, abort, NULL);
0216 }
0217