// SPDX-License-Identifier: GPL-2.0-or-later
/*
* linux/drivers/mmc/core/sd_ops.h
*
* Copyright 2006-2007 Pierre Ossman
*/
#include <linux/slab.h>
#include <linux/types.h>
#include <linux/export.h>
#include <linux/scatterlist.h>
#include <linux/mmc/host.h>
#include <linux/mmc/card.h>
#include <linux/mmc/mmc.h>
#include <linux/mmc/sd.h>
#include "core.h"
#include "sd_ops.h"
#include "mmc_ops.h"
/*
* Extensive testing has shown that some specific SD cards
* require an increased command timeout to be successfully
* initialized.
*/
#define SD_APP_OP_COND_PERIOD_US (10 * 1000) /* 10ms */
#define SD_APP_OP_COND_TIMEOUT_MS 2000 /* 2s */
struct sd_app_op_cond_busy_data {
struct mmc_host *host;
u32 ocr;
struct mmc_command *cmd;
};
int mmc_app_cmd(struct mmc_host *host, struct mmc_card *card)
{
int err;
struct mmc_command cmd = {};
if (WARN_ON(card && card->host != host))
return -EINVAL;
cmd.opcode = MMC_APP_CMD;
if (card) {
cmd.arg = card->rca << 16;
cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
} else {
cmd.arg = 0;
cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_BCR;
}
err = mmc_wait_for_cmd(host, &cmd, 0);
if (err)
return err;
/* Check that card supported application commands */
if (!mmc_host_is_spi(host) && !(cmd.resp[0] & R1_APP_CMD))
return -EOPNOTSUPP;
return 0;
}
EXPORT_SYMBOL_GPL(mmc_app_cmd);
static int mmc_wait_for_app_cmd(struct mmc_host *host, struct mmc_card *card,
struct mmc_command *cmd)
{
struct mmc_request mrq = {};
int i, err = -EIO;
/*
* We have to resend MMC_APP_CMD for each attempt so
* we cannot use the retries field in mmc_command.
*/
for (i = 0; i <= MMC_CMD_RETRIES; i++) {
err = mmc_app_cmd(host, card);
if (err) {
/* no point in retrying; no APP commands allowed */
if (mmc_host_is_spi(host)) {
if (cmd->resp[0] & R1_SPI_ILLEGAL_COMMAND)
break;
}
continue;
}
memset(&mrq, 0, sizeof(struct mmc_request));
memset(cmd->resp, 0, sizeof(cmd->resp));
cmd->retries = 0;
mrq.cmd = cmd;
cmd->data = NULL;
mmc_wait_for_req(host, &mrq);
err = cmd->error;
if (!cmd->error)
break;
/* no point in retrying illegal APP commands */
if (mmc_host_is_spi(host)) {
if (cmd->resp[0] & R1_SPI_ILLEGAL_COMMAND)
break;
}
}
return err;
}
int mmc_app_set_bus_width(struct mmc_card *card, int width)
{
struct mmc_command cmd = {};
cmd.opcode = SD_APP_SET_BUS_WIDTH;
cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
switch (width) {
case MMC_BUS_WIDTH_1:
cmd.arg = SD_BUS_WIDTH_1;
break;
case MMC_BUS_WIDTH_4:
cmd.arg = SD_BUS_WIDTH_4;
break;
default:
return -EINVAL;
}
return mmc_wait_for_app_cmd(card->host, card, &cmd);
}
static int sd_app_op_cond_cb(void *cb_data, bool *busy)
{
struct sd_app_op_cond_busy_data *data = cb_data;
struct mmc_host *host = data->host;
struct mmc_command *cmd = data->cmd;
u32 ocr = data->ocr;
int err;
*busy = false;
err = mmc_wait_for_app_cmd(host, NULL, cmd);
if (err)
return err;
/* If we're just probing, do a single pass. */
if (ocr == 0)
return 0;
/* Wait until reset completes. */
if (mmc_host_is_spi(host)) {
if (!(cmd->resp[0] & R1_SPI_IDLE))
return 0;
} else if (cmd->resp[0] & MMC_CARD_BUSY) {
return 0;
}
*busy = true;
return 0;
}
int mmc_send_app_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr)
{
struct mmc_command cmd = {};
struct sd_app_op_cond_busy_data cb_data = {
.host = host,
.ocr = ocr,
.cmd = &cmd
};
int err;
cmd.opcode = SD_APP_OP_COND;
if (mmc_host_is_spi(host))
cmd.arg = ocr & (1 << 30); /* SPI only defines one bit */
else
cmd.arg = ocr;
cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R3 | MMC_CMD_BCR;
err = __mmc_poll_for_busy(host, SD_APP_OP_COND_PERIOD_US,
SD_APP_OP_COND_TIMEOUT_MS, &sd_app_op_cond_cb,
&cb_data);
if (err)
return err;
if (rocr && !mmc_host_is_spi(host))
*rocr = cmd.resp[0];
return 0;
}
static int __mmc_send_if_cond(struct mmc_host *host, u32 ocr, u8 pcie_bits,
u32 *resp)
{
struct mmc_command cmd = {};
int err;
static const u8 test_pattern = 0xAA;
u8 result_pattern;
/*
* To support SD 2.0 cards, we must always invoke SD_SEND_IF_COND
* before SD_APP_OP_COND. This command will harmlessly fail for
* SD 1.0 cards.
*/
cmd.opcode = SD_SEND_IF_COND;
cmd.arg = ((ocr & 0xFF8000) != 0) << 8 | pcie_bits << 8 | test_pattern;
cmd.flags = MMC_RSP_SPI_R7 | MMC_RSP_R7 | MMC_CMD_BCR;
err = mmc_wait_for_cmd(host, &cmd, 0);
if (err)
return err;
if (mmc_host_is_spi(host))
result_pattern = cmd.resp[1] & 0xFF;
else
result_pattern = cmd.resp[0] & 0xFF;
if (result_pattern != test_pattern)
return -EIO;
if (resp)
*resp = cmd.resp[0];
return 0;
}
int mmc_send_if_cond(struct mmc_host *host, u32 ocr)
{
return __mmc_send_if_cond(host, ocr, 0, NULL);
}
int mmc_send_if_cond_pcie(struct mmc_host *host, u32 ocr)
{
u32 resp = 0;
u8 pcie_bits = 0;
int ret;
if (host->caps2 & MMC_CAP2_SD_EXP) {
/* Probe card for SD express support via PCIe. */
pcie_bits = 0x10;
if (host->caps2 & MMC_CAP2_SD_EXP_1_2V)
/* Probe also for 1.2V support. */
pcie_bits = 0x30;
}
ret = __mmc_send_if_cond(host, ocr, pcie_bits, &resp);
if (ret)
return 0;
/* Continue with the SD express init, if the card supports it. */
resp &= 0x3000;
if (pcie_bits && resp) {
if (resp == 0x3000)
host->ios.timing = MMC_TIMING_SD_EXP_1_2V;
else
host->ios.timing = MMC_TIMING_SD_EXP;
/*
* According to the spec the clock shall also be gated, but
* let's leave this to the host driver for more flexibility.
*/
return host->ops->init_sd_express(host, &host->ios);
}
return 0;
}
int mmc_send_relative_addr(struct mmc_host *host, unsigned int *rca)
{
int err;
struct mmc_command cmd = {};
cmd.opcode = SD_SEND_RELATIVE_ADDR;
cmd.arg = 0;
cmd.flags = MMC_RSP_R6 | MMC_CMD_BCR;
err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
if (err)
return err;
*rca = cmd.resp[0] >> 16;
return 0;
}
int mmc_app_send_scr(struct mmc_card *card)
{
int err;
struct mmc_request mrq = {};
struct mmc_command cmd = {};
struct mmc_data data = {};
struct scatterlist sg;
__be32 *scr;
/* NOTE: caller guarantees scr is heap-allocated */
err = mmc_app_cmd(card->host, card);
if (err)
return err;
/* dma onto stack is unsafe/nonportable, but callers to this
* routine normally provide temporary on-stack buffers ...
*/
scr = kmalloc(sizeof(card->raw_scr), GFP_KERNEL);
if (!scr)
return -ENOMEM;
mrq.cmd = &cmd;
mrq.data = &data;
cmd.opcode = SD_APP_SEND_SCR;
cmd.arg = 0;
cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
data.blksz = 8;
data.blocks = 1;
data.flags = MMC_DATA_READ;
data.sg = &sg;
data.sg_len = 1;
sg_init_one(&sg, scr, 8);
mmc_set_data_timeout(&data, card);
mmc_wait_for_req(card->host, &mrq);
card->raw_scr[0] = be32_to_cpu(scr[0]);
card->raw_scr[1] = be32_to_cpu(scr[1]);
kfree(scr);
if (cmd.error)
return cmd.error;
if (data.error)
return data.error;
return 0;
}
int mmc_sd_switch(struct mmc_card *card, bool mode, int group,
u8 value, u8 *resp)
{
u32 cmd_args;
/* NOTE: caller guarantees resp is heap-allocated */
value &= 0xF;
cmd_args = mode << 31 | 0x00FFFFFF;
cmd_args &= ~(0xF << (group * 4));
cmd_args |= value << (group * 4);
return mmc_send_adtc_data(card, card->host, SD_SWITCH, cmd_args, resp,
64);
}
EXPORT_SYMBOL_GPL(mmc_sd_switch);
int mmc_app_sd_status(struct mmc_card *card, void *ssr)
{
int err;
struct mmc_request mrq = {};
struct mmc_command cmd = {};
struct mmc_data data = {};
struct scatterlist sg;
/* NOTE: caller guarantees ssr is heap-allocated */
err = mmc_app_cmd(card->host, card);
if (err)
return err;
mrq.cmd = &cmd;
mrq.data = &data;
cmd.opcode = SD_APP_SD_STATUS;
cmd.arg = 0;
cmd.flags = MMC_RSP_SPI_R2 | MMC_RSP_R1 | MMC_CMD_ADTC;
data.blksz = 64;
data.blocks = 1;
data.flags = MMC_DATA_READ;
data.sg = &sg;
data.sg_len = 1;
sg_init_one(&sg, ssr, 64);
mmc_set_data_timeout(&data, card);
mmc_wait_for_req(card->host, &mrq);
if (cmd.error)
return cmd.error;
if (data.error)
return data.error;
return 0;
}
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