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mmc: sdhci: Implement MMC_CAP_CMD23 for SDHCI.

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Implements support for multiblock transfers bounded
by SET_BLOCK_COUNT (CMD23).

Signed-off-by: Andrei Warkentin <andreiw@motorola.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
This commit is contained in:
Andrei Warkentin 2011-05-23 15:06:37 -05:00 committed by Chris Ball
parent d0c97cfb81
commit e89d456fcd
3 changed files with 49 additions and 17 deletions
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63
drivers/mmc/host/sdhci.c
View File

@ -838,9 +838,10 @@ static void sdhci_prepare_data(struct sdhci_host *host, struct mmc_command *cmd)
}
static void sdhci_set_transfer_mode(struct sdhci_host *host,
struct mmc_data *data)
struct mmc_command *cmd)
{
u16 mode;
struct mmc_data *data = cmd->data;
if (data == NULL)
return;
@ -848,11 +849,14 @@ static void sdhci_set_transfer_mode(struct sdhci_host *host,
WARN_ON(!host->data);
mode = SDHCI_TRNS_BLK_CNT_EN;
if (data->blocks > 1) {
if (host->quirks & SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12)
mode |= SDHCI_TRNS_MULTI | SDHCI_TRNS_ACMD12;
else
mode |= SDHCI_TRNS_MULTI;
if (mmc_op_multi(cmd->opcode) || data->blocks > 1) {
mode |= SDHCI_TRNS_MULTI;
/*
* If we are sending CMD23, CMD12 never gets sent
* on successful completion (so no Auto-CMD12).
*/
if (!host->mrq->sbc && (host->flags & SDHCI_AUTO_CMD12))
mode |= SDHCI_TRNS_AUTO_CMD12;
}
if (data->flags & MMC_DATA_READ)
mode |= SDHCI_TRNS_READ;
@ -893,7 +897,15 @@ static void sdhci_finish_data(struct sdhci_host *host)
else
data->bytes_xfered = data->blksz * data->blocks;
if (data->stop) {
/*
* Need to send CMD12 if -
* a) open-ended multiblock transfer (no CMD23)
* b) error in multiblock transfer
*/
if (data->stop &&
(data->error ||
!host->mrq->sbc)) {
/*
* The controller needs a reset of internal state machines
* upon error conditions.
@ -949,7 +961,7 @@ static void sdhci_send_command(struct sdhci_host *host, struct mmc_command *cmd)
sdhci_writel(host, cmd->arg, SDHCI_ARGUMENT);
sdhci_set_transfer_mode(host, cmd->data);
sdhci_set_transfer_mode(host, cmd);
if ((cmd->flags & MMC_RSP_136) && (cmd->flags & MMC_RSP_BUSY)) {
printk(KERN_ERR "%s: Unsupported response type!\n",
@ -1004,13 +1016,21 @@ static void sdhci_finish_command(struct sdhci_host *host)
host->cmd->error = 0;
if (host->data && host->data_early)
sdhci_finish_data(host);
/* Finished CMD23, now send actual command. */
if (host->cmd == host->mrq->sbc) {
host->cmd = NULL;
sdhci_send_command(host, host->mrq->cmd);
} else {
if (!host->cmd->data)
tasklet_schedule(&host->finish_tasklet);
/* Processed actual command. */
if (host->data && host->data_early)
sdhci_finish_data(host);
host->cmd = NULL;
if (!host->cmd->data)
tasklet_schedule(&host->finish_tasklet);
host->cmd = NULL;
}
}
static void sdhci_set_clock(struct sdhci_host *host, unsigned int clock)
@ -1189,7 +1209,12 @@ static void sdhci_request(struct mmc_host *mmc, struct mmc_request *mrq)
#ifndef SDHCI_USE_LEDS_CLASS
sdhci_activate_led(host);
#endif
if (host->quirks & SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12) {
/*
* Ensure we don't send the STOP for non-SET_BLOCK_COUNTED
* requests if Auto-CMD12 is enabled.
*/
if (!mrq->sbc && (host->flags & SDHCI_AUTO_CMD12)) {
if (mrq->stop) {
mrq->data->stop = NULL;
mrq->stop = NULL;
@ -1227,7 +1252,10 @@ static void sdhci_request(struct mmc_host *mmc, struct mmc_request *mrq)
host->mrq = mrq;
}
sdhci_send_command(host, mrq->cmd);
if (mrq->sbc)
sdhci_send_command(host, mrq->sbc);
else
sdhci_send_command(host, mrq->cmd);
}
mmiowb();
@ -2455,7 +2483,10 @@ int sdhci_add_host(struct sdhci_host *host)
} else
mmc->f_min = host->max_clk / SDHCI_MAX_DIV_SPEC_200;
mmc->caps |= MMC_CAP_SDIO_IRQ | MMC_CAP_ERASE;
mmc->caps |= MMC_CAP_SDIO_IRQ | MMC_CAP_ERASE | MMC_CAP_CMD23;
if (host->quirks & SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12)
host->flags |= SDHCI_AUTO_CMD12;
/*
* A controller may support 8-bit width, but the board itself

2
drivers/mmc/host/sdhci.h
View File

@ -36,7 +36,7 @@
#define SDHCI_TRANSFER_MODE 0x0C
#define SDHCI_TRNS_DMA 0x01
#define SDHCI_TRNS_BLK_CNT_EN 0x02
#define SDHCI_TRNS_ACMD12 0x04
#define SDHCI_TRNS_AUTO_CMD12 0x04
#define SDHCI_TRNS_READ 0x10
#define SDHCI_TRNS_MULTI 0x20

1
include/linux/mmc/sdhci.h
View File

@ -113,6 +113,7 @@ struct sdhci_host {
#define SDHCI_DEVICE_DEAD (1<<3) /* Device unresponsive */
#define SDHCI_SDR50_NEEDS_TUNING (1<<4) /* SDR50 needs tuning */
#define SDHCI_NEEDS_RETUNING (1<<5) /* Host needs retuning */
#define SDHCI_AUTO_CMD12 (1<<6) /* Auto CMD12 support */
unsigned int version; /* SDHCI spec. version */