| // 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" |
| |
| 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); |
| } |
| |
| int mmc_send_app_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr) |
| { |
| struct mmc_command cmd = {}; |
| int i, err = 0; |
| |
| 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; |
| |
| for (i = 100; i; i--) { |
| err = mmc_wait_for_app_cmd(host, NULL, &cmd); |
| 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)) { |
| if (!(cmd.resp[0] & R1_SPI_IDLE)) |
| break; |
| } else { |
| if (cmd.resp[0] & MMC_CARD_BUSY) |
| break; |
| } |
| |
| err = -ETIMEDOUT; |
| |
| mmc_delay(10); |
| } |
| |
| if (!i) |
| pr_err("%s: card never left busy state\n", mmc_hostname(host)); |
| |
| if (rocr && !mmc_host_is_spi(host)) |
| *rocr = cmd.resp[0]; |
| |
| return err; |
| } |
| |
| 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, int mode, int group, |
| u8 value, u8 *resp) |
| { |
| u32 cmd_args; |
| |
| /* NOTE: caller guarantees resp is heap-allocated */ |
| |
| mode = !!mode; |
| 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; |
| } |