346 строки
6.6 KiB
C
346 строки
6.6 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* linux/drivers/mmc/core/sd_ops.h
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*
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* Copyright 2006-2007 Pierre Ossman
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*/
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#include <linux/slab.h>
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#include <linux/types.h>
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#include <linux/export.h>
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#include <linux/scatterlist.h>
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#include <linux/mmc/host.h>
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#include <linux/mmc/card.h>
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#include <linux/mmc/mmc.h>
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#include <linux/mmc/sd.h>
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#include "core.h"
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#include "sd_ops.h"
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int mmc_app_cmd(struct mmc_host *host, struct mmc_card *card)
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{
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int err;
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struct mmc_command cmd = {};
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if (WARN_ON(card && card->host != host))
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return -EINVAL;
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cmd.opcode = MMC_APP_CMD;
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if (card) {
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cmd.arg = card->rca << 16;
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cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
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} else {
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cmd.arg = 0;
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cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_BCR;
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}
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err = mmc_wait_for_cmd(host, &cmd, 0);
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if (err)
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return err;
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/* Check that card supported application commands */
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if (!mmc_host_is_spi(host) && !(cmd.resp[0] & R1_APP_CMD))
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return -EOPNOTSUPP;
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return 0;
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}
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EXPORT_SYMBOL_GPL(mmc_app_cmd);
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static int mmc_wait_for_app_cmd(struct mmc_host *host, struct mmc_card *card,
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struct mmc_command *cmd)
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{
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struct mmc_request mrq = {};
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int i, err = -EIO;
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/*
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* We have to resend MMC_APP_CMD for each attempt so
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* we cannot use the retries field in mmc_command.
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*/
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for (i = 0; i <= MMC_CMD_RETRIES; i++) {
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err = mmc_app_cmd(host, card);
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if (err) {
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/* no point in retrying; no APP commands allowed */
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if (mmc_host_is_spi(host)) {
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if (cmd->resp[0] & R1_SPI_ILLEGAL_COMMAND)
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break;
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}
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continue;
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}
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memset(&mrq, 0, sizeof(struct mmc_request));
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memset(cmd->resp, 0, sizeof(cmd->resp));
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cmd->retries = 0;
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mrq.cmd = cmd;
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cmd->data = NULL;
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mmc_wait_for_req(host, &mrq);
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err = cmd->error;
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if (!cmd->error)
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break;
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/* no point in retrying illegal APP commands */
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if (mmc_host_is_spi(host)) {
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if (cmd->resp[0] & R1_SPI_ILLEGAL_COMMAND)
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break;
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}
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}
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return err;
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}
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int mmc_app_set_bus_width(struct mmc_card *card, int width)
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{
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struct mmc_command cmd = {};
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cmd.opcode = SD_APP_SET_BUS_WIDTH;
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cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
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switch (width) {
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case MMC_BUS_WIDTH_1:
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cmd.arg = SD_BUS_WIDTH_1;
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break;
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case MMC_BUS_WIDTH_4:
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cmd.arg = SD_BUS_WIDTH_4;
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break;
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default:
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return -EINVAL;
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}
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return mmc_wait_for_app_cmd(card->host, card, &cmd);
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}
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int mmc_send_app_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr)
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{
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struct mmc_command cmd = {};
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int i, err = 0;
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cmd.opcode = SD_APP_OP_COND;
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if (mmc_host_is_spi(host))
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cmd.arg = ocr & (1 << 30); /* SPI only defines one bit */
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else
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cmd.arg = ocr;
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cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R3 | MMC_CMD_BCR;
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for (i = 100; i; i--) {
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err = mmc_wait_for_app_cmd(host, NULL, &cmd);
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if (err)
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break;
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/* if we're just probing, do a single pass */
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if (ocr == 0)
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break;
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/* otherwise wait until reset completes */
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if (mmc_host_is_spi(host)) {
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if (!(cmd.resp[0] & R1_SPI_IDLE))
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break;
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} else {
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if (cmd.resp[0] & MMC_CARD_BUSY)
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break;
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}
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err = -ETIMEDOUT;
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mmc_delay(10);
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}
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if (!i)
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pr_err("%s: card never left busy state\n", mmc_hostname(host));
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if (rocr && !mmc_host_is_spi(host))
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*rocr = cmd.resp[0];
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return err;
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}
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int mmc_send_if_cond(struct mmc_host *host, u32 ocr)
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{
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struct mmc_command cmd = {};
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int err;
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static const u8 test_pattern = 0xAA;
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u8 result_pattern;
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/*
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* To support SD 2.0 cards, we must always invoke SD_SEND_IF_COND
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* before SD_APP_OP_COND. This command will harmlessly fail for
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* SD 1.0 cards.
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*/
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cmd.opcode = SD_SEND_IF_COND;
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cmd.arg = ((ocr & 0xFF8000) != 0) << 8 | test_pattern;
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cmd.flags = MMC_RSP_SPI_R7 | MMC_RSP_R7 | MMC_CMD_BCR;
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err = mmc_wait_for_cmd(host, &cmd, 0);
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if (err)
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return err;
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if (mmc_host_is_spi(host))
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result_pattern = cmd.resp[1] & 0xFF;
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else
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result_pattern = cmd.resp[0] & 0xFF;
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if (result_pattern != test_pattern)
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return -EIO;
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return 0;
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}
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int mmc_send_relative_addr(struct mmc_host *host, unsigned int *rca)
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{
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int err;
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struct mmc_command cmd = {};
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cmd.opcode = SD_SEND_RELATIVE_ADDR;
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cmd.arg = 0;
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cmd.flags = MMC_RSP_R6 | MMC_CMD_BCR;
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err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
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if (err)
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return err;
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*rca = cmd.resp[0] >> 16;
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return 0;
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}
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int mmc_app_send_scr(struct mmc_card *card)
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{
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int err;
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struct mmc_request mrq = {};
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struct mmc_command cmd = {};
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struct mmc_data data = {};
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struct scatterlist sg;
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__be32 *scr;
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/* NOTE: caller guarantees scr is heap-allocated */
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err = mmc_app_cmd(card->host, card);
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if (err)
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return err;
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/* dma onto stack is unsafe/nonportable, but callers to this
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* routine normally provide temporary on-stack buffers ...
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*/
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scr = kmalloc(sizeof(card->raw_scr), GFP_KERNEL);
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if (!scr)
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return -ENOMEM;
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mrq.cmd = &cmd;
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mrq.data = &data;
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cmd.opcode = SD_APP_SEND_SCR;
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cmd.arg = 0;
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cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
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data.blksz = 8;
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data.blocks = 1;
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data.flags = MMC_DATA_READ;
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data.sg = &sg;
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data.sg_len = 1;
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sg_init_one(&sg, scr, 8);
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mmc_set_data_timeout(&data, card);
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mmc_wait_for_req(card->host, &mrq);
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card->raw_scr[0] = be32_to_cpu(scr[0]);
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card->raw_scr[1] = be32_to_cpu(scr[1]);
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kfree(scr);
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if (cmd.error)
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return cmd.error;
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if (data.error)
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return data.error;
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return 0;
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}
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int mmc_sd_switch(struct mmc_card *card, int mode, int group,
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u8 value, u8 *resp)
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{
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struct mmc_request mrq = {};
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struct mmc_command cmd = {};
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struct mmc_data data = {};
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struct scatterlist sg;
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/* NOTE: caller guarantees resp is heap-allocated */
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mode = !!mode;
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value &= 0xF;
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mrq.cmd = &cmd;
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mrq.data = &data;
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cmd.opcode = SD_SWITCH;
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cmd.arg = mode << 31 | 0x00FFFFFF;
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cmd.arg &= ~(0xF << (group * 4));
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cmd.arg |= value << (group * 4);
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cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
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data.blksz = 64;
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data.blocks = 1;
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data.flags = MMC_DATA_READ;
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data.sg = &sg;
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data.sg_len = 1;
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sg_init_one(&sg, resp, 64);
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mmc_set_data_timeout(&data, card);
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mmc_wait_for_req(card->host, &mrq);
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if (cmd.error)
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return cmd.error;
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if (data.error)
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return data.error;
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return 0;
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}
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int mmc_app_sd_status(struct mmc_card *card, void *ssr)
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{
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int err;
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struct mmc_request mrq = {};
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struct mmc_command cmd = {};
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struct mmc_data data = {};
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struct scatterlist sg;
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/* NOTE: caller guarantees ssr is heap-allocated */
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err = mmc_app_cmd(card->host, card);
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if (err)
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return err;
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mrq.cmd = &cmd;
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mrq.data = &data;
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cmd.opcode = SD_APP_SD_STATUS;
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cmd.arg = 0;
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cmd.flags = MMC_RSP_SPI_R2 | MMC_RSP_R1 | MMC_CMD_ADTC;
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data.blksz = 64;
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data.blocks = 1;
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data.flags = MMC_DATA_READ;
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data.sg = &sg;
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data.sg_len = 1;
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sg_init_one(&sg, ssr, 64);
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mmc_set_data_timeout(&data, card);
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mmc_wait_for_req(card->host, &mrq);
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if (cmd.error)
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return cmd.error;
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if (data.error)
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return data.error;
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return 0;
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}
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