Re: [PATCH V8 18/23] mmc: sdhci-uhs2: add request() and others
From: Victor Shih
Date: Fri Jul 21 2023 - 06:12:36 EST
On Tue, Jul 11, 2023 at 12:03 AM Adrian Hunter <adrian.hunter@xxxxxxxxx> wrote:
>
> On 21/06/23 13:01, Victor Shih wrote:
> > From: Victor Shih <victor.shih@xxxxxxxxxxxxxxxxxxx>
> >
> > This is a sdhci version of mmc's request operation.
> > It covers both UHS-I and UHS-II.
> >
> > Updates in V8:
> > - Adjust the position of matching brackets in
> > sdhci_uhs2_send_command_retry().
> > - Modify CameCase definition in __sdhci_uhs2_finish_command().
> > - Modify error message in __sdhci_uhs2_finish_command().
> > - sdhci_uhs2_send_command_retry() to instead of
> > sdhci_uhs2_send_command() in sdhci_uhs2_request().
> > - Use sdhci_uhs2_mode() to simplify code in
> > sdhci_uhs2_request_atomic().
> > - Add forward declaration for sdhci_send_command().
> >
> > Updates in V7:
> > - Cancel export state of some functions.
> > - Remove unnecessary whitespace changes.
> >
> > Updates in V6:
> > - Add uhs2_dev_cmd() to simplify code.
> > - Remove unnecessary functions.
> > - Cancel export state of some functions.
> > - Drop use CONFIG_MMC_DEBUG().
> > - Wrap at 100 columns in some functions.
> >
> > Signed-off-by: Ben Chuang <ben.chuang@xxxxxxxxxxxxxxxxxxx>
> > Signed-off-by: AKASHI Takahiro <takahiro.akashi@xxxxxxxxxx>
> > Signed-off-by: Victor Shih <victor.shih@xxxxxxxxxxxxxxxxxxx>
> > ---
> > drivers/mmc/host/sdhci-uhs2.c | 412 ++++++++++++++++++++++++++++++++++
> > drivers/mmc/host/sdhci.c | 49 ++--
> > drivers/mmc/host/sdhci.h | 8 +
> > 3 files changed, 454 insertions(+), 15 deletions(-)
> >
> > diff --git a/drivers/mmc/host/sdhci-uhs2.c b/drivers/mmc/host/sdhci-uhs2.c
> > index 09b86fec9f7b..ed0a41c97944 100644
> > --- a/drivers/mmc/host/sdhci-uhs2.c
> > +++ b/drivers/mmc/host/sdhci-uhs2.c
> > @@ -14,6 +14,8 @@
> > #include <linux/module.h>
> > #include <linux/iopoll.h>
> > #include <linux/bitfield.h>
> > +#include <linux/mmc/mmc.h>
> > +#include <linux/mmc/host.h>
> >
> > #include "sdhci.h"
> > #include "sdhci-uhs2.h"
> > @@ -24,6 +26,8 @@
> > #define SDHCI_UHS2_DUMP(f, x...) \
> > pr_err("%s: " DRIVER_NAME ": " f, mmc_hostname(host->mmc), ## x)
> >
> > +#define UHS2_ARG_IOADR_MASK 0xfff
> > +
> > void sdhci_uhs2_dump_regs(struct sdhci_host *host)
> > {
> > if (!(sdhci_uhs2_mode(host)))
> > @@ -58,6 +62,11 @@ EXPORT_SYMBOL_GPL(sdhci_uhs2_dump_regs);
> > * *
> > \*****************************************************************************/
> >
> > +static inline u16 uhs2_dev_cmd(struct mmc_command *cmd)
> > +{
> > + return be16_to_cpu((__be16)cmd->uhs2_cmd->arg) & UHS2_ARG_IOADR_MASK;
> > +}
> > +
> > static inline int mmc_opt_regulator_set_ocr(struct mmc_host *mmc,
> > struct regulator *supply,
> > unsigned short vdd_bit)
> > @@ -446,6 +455,408 @@ static int sdhci_uhs2_control(struct mmc_host *mmc, enum sd_uhs2_operation op)
> > return err;
> > }
> >
> > +/*****************************************************************************\
> > + * *
> > + * Core functions *
> > + * *
> > +\*****************************************************************************/
> > +
> > +static void sdhci_uhs2_prepare_data(struct sdhci_host *host, struct mmc_command *cmd)
> > +{
> > + struct mmc_data *data = cmd->data;
> > +
> > + sdhci_initialize_data(host, data);
> > +
> > + sdhci_prepare_dma(host, data);
> > +
> > + sdhci_writew(host, data->blksz, SDHCI_UHS2_BLOCK_SIZE);
> > + sdhci_writew(host, data->blocks, SDHCI_UHS2_BLOCK_COUNT);
> > +}
> > +
> > +static void sdhci_uhs2_finish_data(struct sdhci_host *host)
> > +{
> > + struct mmc_data *data = host->data;
> > +
> > + __sdhci_finish_data_common(host);
> > +
> > + __sdhci_finish_mrq(host, data->mrq);
> > +}
> > +
> > +static void sdhci_uhs2_set_transfer_mode(struct sdhci_host *host, struct mmc_command *cmd)
> > +{
> > + u16 mode;
> > + struct mmc_data *data = cmd->data;
> > +
> > + if (!data) {
> > + /* clear Auto CMD settings for no data CMDs */
> > + if (uhs2_dev_cmd(cmd) == UHS2_DEV_CMD_TRANS_ABORT) {
> > + mode = 0;
> > + } else {
> > + mode = sdhci_readw(host, SDHCI_UHS2_TRANS_MODE);
> > + if (cmd->opcode == MMC_STOP_TRANSMISSION || cmd->opcode == MMC_ERASE)
> > + mode |= SDHCI_UHS2_TRNS_WAIT_EBSY;
> > + else
> > + /* send status mode */
> > + if (cmd->opcode == MMC_SEND_STATUS)
> > + mode = 0;
> > + }
> > +
> > + DBG("UHS2 no data trans mode is 0x%x.\n", mode);
> > +
> > + sdhci_writew(host, mode, SDHCI_UHS2_TRANS_MODE);
> > + return;
> > + }
> > +
> > + WARN_ON(!host->data);
> > +
> > + mode = SDHCI_UHS2_TRNS_BLK_CNT_EN | SDHCI_UHS2_TRNS_WAIT_EBSY;
> > + if (data->flags & MMC_DATA_WRITE)
> > + mode |= SDHCI_UHS2_TRNS_DATA_TRNS_WRT;
> > +
> > + if (data->blocks == 1 &&
> > + data->blksz != 512 &&
> > + cmd->opcode != MMC_READ_SINGLE_BLOCK &&
> > + cmd->opcode != MMC_WRITE_BLOCK) {
> > + mode &= ~SDHCI_UHS2_TRNS_BLK_CNT_EN;
> > + mode |= SDHCI_UHS2_TRNS_BLK_BYTE_MODE;
> > + }
> > +
> > + if (host->flags & SDHCI_REQ_USE_DMA)
> > + mode |= SDHCI_UHS2_TRNS_DMA;
> > +
> > + if ((mmc_card_uhs2_hd_mode(host->mmc)) && !cmd->uhs2_tmode0_flag)
> > + mode |= SDHCI_UHS2_TRNS_2L_HD;
> > +
> > + sdhci_writew(host, mode, SDHCI_UHS2_TRANS_MODE);
> > +
> > + DBG("UHS2 trans mode is 0x%x.\n", mode);
> > +}
> > +
> > +static void __sdhci_uhs2_send_command(struct sdhci_host *host, struct mmc_command *cmd)
> > +{
> > + int i, j;
> > + int cmd_reg;
> > +
> > + i = 0;
> > + sdhci_writel(host,
> > + ((u32)cmd->uhs2_cmd->arg << 16) |
> > + (u32)cmd->uhs2_cmd->header,
> > + SDHCI_UHS2_CMD_PACKET + i);
> > + i += 4;
> > +
> > + /*
> > + * Per spec, playload (config) should be MSB before sending out.
>
> playload -> payload
>
Hi, Adrian
I will fix it in the V9 version.
Thanks, Victor Shih
> > + * But we don't need convert here because had set payload as
> > + * MSB when preparing config read/write commands.
> > + */
> > + for (j = 0; j < cmd->uhs2_cmd->payload_len / sizeof(u32); j++) {
> > + sdhci_writel(host, *(cmd->uhs2_cmd->payload + j), SDHCI_UHS2_CMD_PACKET + i);
> > + i += 4;
> > + }
> > +
> > + for ( ; i < SDHCI_UHS2_CMD_PACK_MAX_LEN; i += 4)
> > + sdhci_writel(host, 0, SDHCI_UHS2_CMD_PACKET + i);
> > +
> > + DBG("UHS2 CMD packet_len = %d.\n", cmd->uhs2_cmd->packet_len);
> > + for (i = 0; i < cmd->uhs2_cmd->packet_len; i++)
> > + DBG("UHS2 CMD_PACKET[%d] = 0x%x.\n", i,
> > + sdhci_readb(host, SDHCI_UHS2_CMD_PACKET + i));
> > +
> > + cmd_reg = FIELD_PREP(SDHCI_UHS2_CMD_PACK_LEN_MASK, cmd->uhs2_cmd->packet_len);
> > + if ((cmd->flags & MMC_CMD_MASK) == MMC_CMD_ADTC)
> > + cmd_reg |= SDHCI_UHS2_CMD_DATA;
> > + if (cmd->opcode == MMC_STOP_TRANSMISSION)
> > + cmd_reg |= SDHCI_UHS2_CMD_CMD12;
> > +
> > + /* UHS2 Native ABORT */
> > + if ((cmd->uhs2_cmd->header & UHS2_NATIVE_PACKET) &&
> > + (uhs2_dev_cmd(cmd) == UHS2_DEV_CMD_TRANS_ABORT))
> > + cmd_reg |= SDHCI_UHS2_CMD_TRNS_ABORT;
> > +
> > + /* UHS2 Native DORMANT */
> > + if ((cmd->uhs2_cmd->header & UHS2_NATIVE_PACKET) &&
> > + (uhs2_dev_cmd(cmd) == UHS2_DEV_CMD_GO_DORMANT_STATE))
> > + cmd_reg |= SDHCI_UHS2_CMD_DORMANT;
> > +
> > + DBG("0x%x is set to UHS2 CMD register.\n", cmd_reg);
> > +
> > + sdhci_writew(host, cmd_reg, SDHCI_UHS2_CMD);
> > +}
> > +
> > +static bool sdhci_uhs2_send_command(struct sdhci_host *host, struct mmc_command *cmd)
> > +{
> > + int flags;
> > + u32 mask;
> > + unsigned long timeout;
> > +
> > + WARN_ON(host->cmd);
> > +
> > + /* Initially, a command has no error */
> > + cmd->error = 0;
> > +
> > + if (cmd->opcode == MMC_STOP_TRANSMISSION)
> > + cmd->flags |= MMC_RSP_BUSY;
> > +
> > + mask = SDHCI_CMD_INHIBIT;
> > +
> > + if (sdhci_readl(host, SDHCI_PRESENT_STATE) & mask)
> > + return false;
> > +
> > + host->cmd = cmd;
> > + host->data_timeout = 0;
> > + if (sdhci_data_line_cmd(cmd)) {
> > + WARN_ON(host->data_cmd);
> > + host->data_cmd = cmd;
> > + __sdhci_uhs2_set_timeout(host);
> > + }
> > +
> > + if (cmd->data)
> > + sdhci_uhs2_prepare_data(host, cmd);
> > +
> > + sdhci_uhs2_set_transfer_mode(host, cmd);
> > +
> > + if ((cmd->flags & MMC_RSP_136) && (cmd->flags & MMC_RSP_BUSY)) {
> > + WARN_ONCE(1, "Unsupported response type!\n");
> > + /*
> > + * This does not happen in practice because 136-bit response
> > + * commands never have busy waiting, so rather than complicate
> > + * the error path, just remove busy waiting and continue.
> > + */
> > + cmd->flags &= ~MMC_RSP_BUSY;
> > + }
> > +
> > + if (!(cmd->flags & MMC_RSP_PRESENT))
> > + flags = SDHCI_CMD_RESP_NONE;
> > + else if (cmd->flags & MMC_RSP_136)
> > + flags = SDHCI_CMD_RESP_LONG;
> > + else if (cmd->flags & MMC_RSP_BUSY)
> > + flags = SDHCI_CMD_RESP_SHORT_BUSY;
> > + else
> > + flags = SDHCI_CMD_RESP_SHORT;
> > +
> > + if (cmd->flags & MMC_RSP_CRC)
> > + flags |= SDHCI_CMD_CRC;
> > + if (cmd->flags & MMC_RSP_OPCODE)
> > + flags |= SDHCI_CMD_INDEX;
> > +
> > + timeout = jiffies;
> > + if (host->data_timeout)
> > + timeout += nsecs_to_jiffies(host->data_timeout);
> > + else if (!cmd->data && cmd->busy_timeout > 9000)
> > + timeout += DIV_ROUND_UP(cmd->busy_timeout, 1000) * HZ + HZ;
> > + else
> > + timeout += 10 * HZ;
> > + sdhci_mod_timer(host, cmd->mrq, timeout);
> > +
> > + __sdhci_uhs2_send_command(host, cmd);
> > +
> > + return true;
> > +}
> > +
> > +static bool sdhci_uhs2_send_command_retry(struct sdhci_host *host,
> > + struct mmc_command *cmd,
> > + unsigned long flags)
> > + __releases(host->lock)
> > + __acquires(host->lock)
> > +{
> > + struct mmc_command *deferred_cmd = host->deferred_cmd;
> > + int timeout = 10; /* Approx. 10 ms */
> > + bool present;
> > +
> > + while (!sdhci_uhs2_send_command(host, cmd)) {
> > + if (!timeout--) {
> > + pr_err("%s: Controller never released inhibit bit(s).\n",
> > + mmc_hostname(host->mmc));
> > + sdhci_dumpregs(host);
> > + cmd->error = -EIO;
> > + return false;
> > + }
> > +
> > + spin_unlock_irqrestore(&host->lock, flags);
> > +
> > + usleep_range(1000, 1250);
> > +
> > + present = host->mmc->ops->get_cd(host->mmc);
> > +
> > + spin_lock_irqsave(&host->lock, flags);
> > +
> > + /* A deferred command might disappear, handle that */
> > + if (cmd == deferred_cmd && cmd != host->deferred_cmd)
> > + return true;
> > +
> > + if (sdhci_present_error(host, cmd, present))
> > + return false;
> > + }
> > +
> > + if (cmd == host->deferred_cmd)
> > + host->deferred_cmd = NULL;
> > +
> > + return true;
> > +}
> > +
> > +static void __sdhci_uhs2_finish_command(struct sdhci_host *host)
> > +{
> > + struct mmc_command *cmd = host->cmd;
> > + u8 resp;
> > + u8 ecode;
> > + bool breada0 = 0;
> > + int i;
> > +
> > + if (host->mmc->flags & MMC_UHS2_SD_TRAN) {
> > + resp = sdhci_readb(host, SDHCI_UHS2_RESPONSE + 2);
> > + if (resp & UHS2_RES_NACK_MASK) {
> > + ecode = (resp >> UHS2_RES_ECODE_POS) & UHS2_RES_ECODE_MASK;
> > + pr_err("%s: NACK response, ECODE=0x%x.\n", mmc_hostname(host->mmc), ecode);
> > + }
> > + breada0 = 1;
> > + }
> > +
> > + if (cmd->uhs2_resp &&
> > + cmd->uhs2_resp_len && cmd->uhs2_resp_len <= 20) {
> > + /* Get whole response of some native CCMD, like
> > + * DEVICE_INIT, ENUMERATE.
> > + */
> > + for (i = 0; i < cmd->uhs2_resp_len; i++)
> > + cmd->uhs2_resp[i] = sdhci_readb(host, SDHCI_UHS2_RESPONSE + i);
> > + } else {
> > + /* Get SD CMD response and Payload for some read
> > + * CCMD, like INQUIRY_CFG.
> > + */
> > + /* Per spec (p136), payload field is divided into
> > + * a unit of DWORD and transmission order within
> > + * a DWORD is big endian.
> > + */
> > + if (!breada0)
> > + sdhci_readl(host, SDHCI_UHS2_RESPONSE);
> > + for (i = 4; i < 20; i += 4) {
> > + cmd->resp[i / 4 - 1] =
> > + (sdhci_readb(host,
> > + SDHCI_UHS2_RESPONSE + i) << 24) |
> > + (sdhci_readb(host,
> > + SDHCI_UHS2_RESPONSE + i + 1)
> > + << 16) |
> > + (sdhci_readb(host,
> > + SDHCI_UHS2_RESPONSE + i + 2)
> > + << 8) |
> > + sdhci_readb(host, SDHCI_UHS2_RESPONSE + i + 3);
> > + }
> > + }
> > +}
> > +
> > +static void sdhci_uhs2_finish_command(struct sdhci_host *host)
> > +{
> > + struct mmc_command *cmd = host->cmd;
> > +
> > + __sdhci_uhs2_finish_command(host);
> > +
> > + host->cmd = NULL;
> > +
> > + if (cmd->mrq->cap_cmd_during_tfr && cmd == cmd->mrq->cmd)
> > + mmc_command_done(host->mmc, cmd->mrq);
> > +
> > + /*
> > + * The host can send and interrupt when the busy state has
> > + * ended, allowing us to wait without wasting CPU cycles.
> > + * The busy signal uses DAT0 so this is similar to waiting
> > + * for data to complete.
> > + *
> > + * Note: The 1.0 specification is a bit ambiguous about this
> > + * feature so there might be some problems with older
> > + * controllers.
> > + */
> > + if (cmd->flags & MMC_RSP_BUSY) {
> > + if (cmd->data) {
> > + DBG("Cannot wait for busy signal when also doing a data transfer");
> > + } else if (!(host->quirks & SDHCI_QUIRK_NO_BUSY_IRQ) &&
> > + cmd == host->data_cmd) {
> > + /* Command complete before busy is ended */
> > + return;
> > + }
> > + }
> > +
> > + /* Processed actual command. */
> > + if (host->data && host->data_early)
> > + sdhci_uhs2_finish_data(host);
> > +
> > + if (!cmd->data)
> > + __sdhci_finish_mrq(host, cmd->mrq);
> > +}
> > +
> > +void sdhci_uhs2_request(struct mmc_host *mmc, struct mmc_request *mrq)
> > +{
> > + struct sdhci_host *host = mmc_priv(mmc);
> > + struct mmc_command *cmd;
> > + unsigned long flags;
> > + bool present;
> > +
> > + if (!(sdhci_uhs2_mode(host))) {
> > + sdhci_request(mmc, mrq);
> > + return;
> > + }
> > +
> > + mrq->stop = NULL;
> > + mrq->sbc = NULL;
> > + if (mrq->data)
> > + mrq->data->stop = NULL;
> > +
> > + /* Firstly check card presence */
> > + present = mmc->ops->get_cd(mmc);
> > +
> > + spin_lock_irqsave(&host->lock, flags);
> > +
> > + if (sdhci_present_error(host, mrq->cmd, present))
> > + goto out_finish;
> > +
> > + cmd = mrq->cmd;
> > +
> > + if (!sdhci_uhs2_send_command_retry(host, cmd, flags))
> > + goto out_finish;
> > +
> > + spin_unlock_irqrestore(&host->lock, flags);
> > +
> > + return;
> > +
> > +out_finish:
> > + sdhci_finish_mrq(host, mrq);
> > + spin_unlock_irqrestore(&host->lock, flags);
> > +}
> > +EXPORT_SYMBOL_GPL(sdhci_uhs2_request);
> > +
> > +int sdhci_uhs2_request_atomic(struct mmc_host *mmc, struct mmc_request *mrq)
> > +{
> > + struct sdhci_host *host = mmc_priv(mmc);
> > + struct mmc_command *cmd;
> > + unsigned long flags;
> > + int ret = 0;
> > +
> > + if (!sdhci_uhs2_mode(host))
> > + return sdhci_request_atomic(mmc, mrq);
> > +
> > + spin_lock_irqsave(&host->lock, flags);
> > +
> > + if (sdhci_present_error(host, mrq->cmd, true)) {
> > + sdhci_finish_mrq(host, mrq);
> > + goto out_finish;
> > + }
> > +
> > + cmd = mrq->cmd;
> > +
> > + /*
> > + * The HSQ may send a command in interrupt context without polling
> > + * the busy signaling, which means we should return BUSY if controller
> > + * has not released inhibit bits to allow HSQ trying to send request
> > + * again in non-atomic context. So we should not finish this request
> > + * here.
> > + */
> > + if (!sdhci_uhs2_send_command(host, cmd))
> > + ret = -EBUSY;
> > +
> > +out_finish:
> > + spin_unlock_irqrestore(&host->lock, flags);
> > + return ret;
> > +}
> > +EXPORT_SYMBOL_GPL(sdhci_uhs2_request_atomic);
> > +
> > /*****************************************************************************\
> > * *
> > * Driver init/exit *
> > @@ -569,6 +980,7 @@ static int sdhci_uhs2_host_ops_init(struct sdhci_host *host)
> > host->mmc_host_ops.start_signal_voltage_switch =
> > sdhci_uhs2_start_signal_voltage_switch;
> > host->mmc_host_ops.uhs2_control = sdhci_uhs2_control;
> > + host->mmc_host_ops.request = sdhci_uhs2_request;
> >
> > return 0;
> > }
> > diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
> > index 6e5a9d93a769..2f47c4f29bab 100644
> > --- a/drivers/mmc/host/sdhci.c
> > +++ b/drivers/mmc/host/sdhci.c
> > @@ -147,10 +147,11 @@ void sdhci_enable_v4_mode(struct sdhci_host *host)
> > }
> > EXPORT_SYMBOL_GPL(sdhci_enable_v4_mode);
> >
> > -static inline bool sdhci_data_line_cmd(struct mmc_command *cmd)
> > +bool sdhci_data_line_cmd(struct mmc_command *cmd)
> > {
> > return cmd->data || cmd->flags & MMC_RSP_BUSY;
> > }
> > +EXPORT_SYMBOL_GPL(sdhci_data_line_cmd);
> >
> > static void sdhci_set_card_detection(struct sdhci_host *host, bool enable)
> > {
> > @@ -502,14 +503,15 @@ static inline void sdhci_led_deactivate(struct sdhci_host *host)
> >
> > #endif
> >
> > -static void sdhci_mod_timer(struct sdhci_host *host, struct mmc_request *mrq,
> > - unsigned long timeout)
> > +void sdhci_mod_timer(struct sdhci_host *host, struct mmc_request *mrq,
> > + unsigned long timeout)
> > {
> > if (sdhci_data_line_cmd(mrq->cmd))
> > mod_timer(&host->data_timer, timeout);
> > else
> > mod_timer(&host->timer, timeout);
> > }
> > +EXPORT_SYMBOL_GPL(sdhci_mod_timer);
> >
> > static void sdhci_del_timer(struct sdhci_host *host, struct mmc_request *mrq)
> > {
> > @@ -1076,8 +1078,7 @@ static void sdhci_set_timeout(struct sdhci_host *host, struct mmc_command *cmd)
> > __sdhci_set_timeout(host, cmd);
> > }
> >
> > -static void sdhci_initialize_data(struct sdhci_host *host,
> > - struct mmc_data *data)
> > +void sdhci_initialize_data(struct sdhci_host *host, struct mmc_data *data)
> > {
> > WARN_ON(host->data);
> >
> > @@ -1090,6 +1091,7 @@ static void sdhci_initialize_data(struct sdhci_host *host,
> > host->data_early = 0;
> > host->data->bytes_xfered = 0;
> > }
> > +EXPORT_SYMBOL_GPL(sdhci_initialize_data);
> >
> > static inline void sdhci_set_block_info(struct sdhci_host *host,
> > struct mmc_data *data)
> > @@ -1112,12 +1114,8 @@ static inline void sdhci_set_block_info(struct sdhci_host *host,
> > }
> > }
> >
> > -static void sdhci_prepare_data(struct sdhci_host *host, struct mmc_command *cmd)
> > +void sdhci_prepare_dma(struct sdhci_host *host, struct mmc_data *data)
> > {
> > - struct mmc_data *data = cmd->data;
> > -
> > - sdhci_initialize_data(host, data);
> > -
> > if (host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA)) {
> > struct scatterlist *sg;
> > unsigned int length_mask, offset_mask;
> > @@ -1202,6 +1200,16 @@ static void sdhci_prepare_data(struct sdhci_host *host, struct mmc_command *cmd)
> > }
> >
> > sdhci_set_transfer_irqs(host);
> > +}
> > +EXPORT_SYMBOL_GPL(sdhci_prepare_dma);
> > +
> > +static void sdhci_prepare_data(struct sdhci_host *host, struct mmc_command *cmd)
> > +{
> > + struct mmc_data *data = cmd->data;
> > +
> > + sdhci_initialize_data(host, data);
> > +
> > + sdhci_prepare_dma(host, data);
> >
> > sdhci_set_block_info(host, data);
> > }
> > @@ -1519,7 +1527,7 @@ static void sdhci_set_mrq_done(struct sdhci_host *host, struct mmc_request *mrq)
> > WARN_ON(i >= SDHCI_MAX_MRQS);
> > }
> >
> > -static void __sdhci_finish_mrq(struct sdhci_host *host, struct mmc_request *mrq)
> > +void __sdhci_finish_mrq(struct sdhci_host *host, struct mmc_request *mrq)
> > {
> > if (host->cmd && host->cmd->mrq == mrq)
> > host->cmd = NULL;
> > @@ -1543,15 +1551,17 @@ static void __sdhci_finish_mrq(struct sdhci_host *host, struct mmc_request *mrq)
> > if (!sdhci_has_requests(host))
> > sdhci_led_deactivate(host);
> > }
> > +EXPORT_SYMBOL_GPL(__sdhci_finish_mrq);
> >
> > -static void sdhci_finish_mrq(struct sdhci_host *host, struct mmc_request *mrq)
> > +void sdhci_finish_mrq(struct sdhci_host *host, struct mmc_request *mrq)
> > {
> > __sdhci_finish_mrq(host, mrq);
> >
> > queue_work(host->complete_wq, &host->complete_work);
> > }
> > +EXPORT_SYMBOL_GPL(sdhci_finish_mrq);
> >
> > -static void __sdhci_finish_data(struct sdhci_host *host, bool sw_data_timeout)
> > +void __sdhci_finish_data_common(struct sdhci_host *host)
> > {
> > struct mmc_command *data_cmd = host->data_cmd;
> > struct mmc_data *data = host->data;
> > @@ -1585,6 +1595,14 @@ static void __sdhci_finish_data(struct sdhci_host *host, bool sw_data_timeout)
> > data->bytes_xfered = 0;
> > else
> > data->bytes_xfered = data->blksz * data->blocks;
> > +}
> > +EXPORT_SYMBOL_GPL(__sdhci_finish_data_common);
> > +
> > +static void __sdhci_finish_data(struct sdhci_host *host, bool sw_data_timeout)
> > +{
> > + struct mmc_data *data = host->data;
> > +
> > + __sdhci_finish_data_common(host);
> >
> > /*
> > * Need to send CMD12 if -
> > @@ -1719,8 +1737,8 @@ static bool sdhci_send_command(struct sdhci_host *host, struct mmc_command *cmd)
> > return true;
> > }
> >
> > -static bool sdhci_present_error(struct sdhci_host *host,
> > - struct mmc_command *cmd, bool present)
> > +bool sdhci_present_error(struct sdhci_host *host,
> > + struct mmc_command *cmd, bool present)
> > {
> > if (!present || host->flags & SDHCI_DEVICE_DEAD) {
> > cmd->error = -ENOMEDIUM;
> > @@ -1729,6 +1747,7 @@ static bool sdhci_present_error(struct sdhci_host *host,
> >
> > return false;
> > }
> > +EXPORT_SYMBOL_GPL(sdhci_present_error);
> >
> > static bool sdhci_send_command_retry(struct sdhci_host *host,
> > struct mmc_command *cmd,
> > diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
> > index 03d29423a678..9a2bd319d94c 100644
> > --- a/drivers/mmc/host/sdhci.h
> > +++ b/drivers/mmc/host/sdhci.h
> > @@ -828,6 +828,14 @@ static inline void sdhci_read_caps(struct sdhci_host *host)
> > __sdhci_read_caps(host, NULL, NULL, NULL);
> > }
> >
> > +bool sdhci_data_line_cmd(struct mmc_command *cmd);
> > +void sdhci_mod_timer(struct sdhci_host *host, struct mmc_request *mrq, unsigned long timeout);
> > +void sdhci_initialize_data(struct sdhci_host *host, struct mmc_data *data);
> > +void sdhci_prepare_dma(struct sdhci_host *host, struct mmc_data *data);
> > +void __sdhci_finish_mrq(struct sdhci_host *host, struct mmc_request *mrq);
> > +void sdhci_finish_mrq(struct sdhci_host *host, struct mmc_request *mrq);
> > +void __sdhci_finish_data_common(struct sdhci_host *host);
> > +bool sdhci_present_error(struct sdhci_host *host, struct mmc_command *cmd, bool present);
> > u16 sdhci_calc_clk(struct sdhci_host *host, unsigned int clock,
> > unsigned int *actual_clock);
> > void sdhci_set_clock(struct sdhci_host *host, unsigned int clock);
>