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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* linux/drivers/mmc/sdio_ops.c
*
* Copyright 2006-2007 Pierre Ossman
*/
#include <linux/scatterlist.h>
#include <linux/mmc/host.h>
#include <linux/mmc/card.h>
#include <linux/mmc/mmc.h>
#include <linux/mmc/sdio.h>
#include "core.h"
#include "sdio_ops.h"
int mmc_send_io_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr)
{
struct mmc_command cmd = {};
int i, err = 0;
cmd.opcode = SD_IO_SEND_OP_COND;
cmd.arg = ocr;
cmd.flags = MMC_RSP_SPI_R4 | MMC_RSP_R4 | MMC_CMD_BCR;
for (i = 100; i; i--) {
err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
if (err)
break;
/* if we're just probing, do a single pass */
if (ocr == 0)
break;
/* otherwise wait until reset completes */
if (mmc_host_is_spi(host)) {
/*
* Both R1_SPI_IDLE and MMC_CARD_BUSY indicate
* an initialized card under SPI, but some cards
* (Marvell's) only behave when looking at this
* one.
*/
if (cmd.resp[1] & MMC_CARD_BUSY)
break;
} else {
if (cmd.resp[0] & MMC_CARD_BUSY)
break;
}
err = -ETIMEDOUT;
mmc_delay(10);
}
if (rocr)
*rocr = cmd.resp[mmc_host_is_spi(host) ? 1 : 0];
return err;
}
static int mmc_io_rw_direct_host(struct mmc_host *host, int write, unsigned fn,
unsigned addr, u8 in, u8 *out)
{
struct mmc_command cmd = {};
int err;
if (fn > 7)
return -EINVAL;
/* sanity check */
if (addr & ~0x1FFFF)
return -EINVAL;
cmd.opcode = SD_IO_RW_DIRECT;
cmd.arg = write ? 0x80000000 : 0x00000000;
cmd.arg |= fn << 28;
cmd.arg |= (write && out) ? 0x08000000 : 0x00000000;
cmd.arg |= addr << 9;
cmd.arg |= in;
cmd.flags = MMC_RSP_SPI_R5 | MMC_RSP_R5 | MMC_CMD_AC;
err = mmc_wait_for_cmd(host, &cmd, 0);
if (err)
return err;
if (mmc_host_is_spi(host)) {
/* host driver already reported errors */
} else {
if (cmd.resp[0] & R5_ERROR)
return -EIO;
if (cmd.resp[0] & R5_FUNCTION_NUMBER)
return -EINVAL;
if (cmd.resp[0] & R5_OUT_OF_RANGE)
return -ERANGE;
}
if (out) {
if (mmc_host_is_spi(host))
*out = (cmd.resp[0] >> 8) & 0xFF;
else
*out = cmd.resp[0] & 0xFF;
}
return 0;
}
int mmc_io_rw_direct(struct mmc_card *card, int write, unsigned fn,
unsigned addr, u8 in, u8 *out)
{
return mmc_io_rw_direct_host(card->host, write, fn, addr, in, out);
}
int mmc_io_rw_extended(struct mmc_card *card, int write, unsigned fn,
unsigned addr, int incr_addr, u8 *buf, unsigned blocks, unsigned blksz)
{
struct mmc_request mrq = {};
struct mmc_command cmd = {};
struct mmc_data data = {};
struct scatterlist sg, *sg_ptr;
struct sg_table sgtable;
unsigned int nents, left_size, i;
unsigned int seg_size = card->host->max_seg_size;
int err;
WARN_ON(blksz == 0);
/* sanity check */
if (addr & ~0x1FFFF)
return -EINVAL;
mrq.cmd = &cmd;
mrq.data = &data;
cmd.opcode = SD_IO_RW_EXTENDED;
cmd.arg = write ? 0x80000000 : 0x00000000;
cmd.arg |= fn << 28;
cmd.arg |= incr_addr ? 0x04000000 : 0x00000000;
cmd.arg |= addr << 9;
if (blocks == 0)
cmd.arg |= (blksz == 512) ? 0 : blksz; /* byte mode */
else
cmd.arg |= 0x08000000 | blocks; /* block mode */
cmd.flags = MMC_RSP_SPI_R5 | MMC_RSP_R5 | MMC_CMD_ADTC;
data.blksz = blksz;
/* Code in host drivers/fwk assumes that "blocks" always is >=1 */
data.blocks = blocks ? blocks : 1;
data.flags = write ? MMC_DATA_WRITE : MMC_DATA_READ;
left_size = data.blksz * data.blocks;
nents = DIV_ROUND_UP(left_size, seg_size);
if (nents > 1) {
if (sg_alloc_table(&sgtable, nents, GFP_KERNEL))
return -ENOMEM;
data.sg = sgtable.sgl;
data.sg_len = nents;
for_each_sg(data.sg, sg_ptr, data.sg_len, i) {
sg_set_buf(sg_ptr, buf + i * seg_size,
min(seg_size, left_size));
left_size -= seg_size;
}
} else {
data.sg = &sg;
data.sg_len = 1;
sg_init_one(&sg, buf, left_size);
}
mmc_set_data_timeout(&data, card);
mmc_pre_req(card->host, &mrq);
mmc_wait_for_req(card->host, &mrq);
if (cmd.error)
err = cmd.error;
else if (data.error)
err = data.error;
else if (mmc_host_is_spi(card->host))
/* host driver already reported errors */
err = 0;
else if (cmd.resp[0] & R5_ERROR)
err = -EIO;
else if (cmd.resp[0] & R5_FUNCTION_NUMBER)
err = -EINVAL;
else if (cmd.resp[0] & R5_OUT_OF_RANGE)
err = -ERANGE;
else
err = 0;
mmc_post_req(card->host, &mrq, err);
if (nents > 1)
sg_free_table(&sgtable);
return err;
}
int sdio_reset(struct mmc_host *host)
{
int ret;
u8 abort;
/* SDIO Simplified Specification V2.0, 4.4 Reset for SDIO */
ret = mmc_io_rw_direct_host(host, 0, 0, SDIO_CCCR_ABORT, 0, &abort);
if (ret)
abort = 0x08;
else
abort |= 0x08;
return mmc_io_rw_direct_host(host, 1, 0, SDIO_CCCR_ABORT, abort, NULL);
}
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