Re: [PATCH V10 18/23] mmc: sdhci-uhs2: add request() and others
From: Adrian Hunter
Date: Thu Aug 31 2023 - 07:20:47 EST
On 31/08/23 13:33, Victor Shih wrote:
> On Thu, Aug 31, 2023 at 4:33 PM Adrian Hunter <adrian.hunter@xxxxxxxxx> wrote:
>>
>> On 18/08/23 13:02, 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.
>>>
>>> Signed-off-by: Ben Chuang <ben.chuang@xxxxxxxxxxxxxxxxxxx>
>>> Signed-off-by: AKASHI Takahiro <takahiro.akashi@xxxxxxxxxx>
>>> Signed-off-by: Victor Shih <victor.shih@xxxxxxxxxxxxxxxxxxx>
>>> ---
>>>
>>> Updates in V10:
>>> - Use tmode_half_duplex to instead of uhs2_tmode0_flag
>>> in sdhci_uhs2_set_transfer_mode().
>>>
>>> Updates in V9:
>>> - Modify the annotations in __sdhci_uhs2_send_command().
>>>
>>> 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.
>>>
>>> ---
>>>
>>> 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..08fef7174239 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_cmd->tmode_half_duplex)
>>
>> Should not check mmc_card_uhs2_hd_mode(host->mmc). The mmc core
>> must get it right.
>>
>> Also why is the setting different for different commands?
>>
>
> Hi, Adrian
>
> I will drop the check mmc_card_uhs2_hd_mode(host->mmc) in the next version.
> But I'm not quite sure what the "why is the setting different for
> different commands" means.
> Could you help explain it a little bit more clearly?
In mmc_uhs2_prepare_cmd() there is this code:
if (cmd->opcode == SD_APP_SEND_SCR || cmd->opcode == SD_APP_SD_STATUS ||
cmd->opcode == MMC_SEND_EXT_CSD || cmd->opcode == SD_SWITCH ||
cmd->opcode == SD_READ_EXTR_SINGLE || cmd->opcode == MMC_SEND_CSD ||
cmd->opcode == MMC_SEND_CID)
cmd->uhs2_cmd->tmode_half_duplex = 0;
else
cmd->uhs2_cmd->tmode_half_duplex = mmc_card_uhs2_hd_mode(host);
So different commands can have different duplex? Why is that?
>
> Thanks, Victor Shih
>
>>> + 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, payload (config) should be MSB before sending out.
>>> + * 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 57209accbb03..9d031e83b6ba 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);
>>