diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/mmc/host/omap.c | 93 |
1 files changed, 83 insertions, 10 deletions
diff --git a/drivers/mmc/host/omap.c b/drivers/mmc/host/omap.c index 535499f11e7..a1dfa74c50a 100644 --- a/drivers/mmc/host/omap.c +++ b/drivers/mmc/host/omap.c @@ -134,6 +134,9 @@ struct mmc_omap_host { unsigned char bus_mode; unsigned char hw_bus_mode; + struct work_struct cmd_abort; + struct timer_list cmd_timer; + unsigned int sg_len; int sg_idx; u16 * buffer; @@ -314,6 +317,8 @@ mmc_omap_start_command(struct mmc_omap_host *host, struct mmc_command *cmd) if (host->data && !(host->data->flags & MMC_DATA_WRITE)) cmdreg |= 1 << 15; + mod_timer(&host->cmd_timer, jiffies + HZ/2); + OMAP_MMC_WRITE(host, CTO, 200); OMAP_MMC_WRITE(host, ARGL, cmd->arg & 0xffff); OMAP_MMC_WRITE(host, ARGH, cmd->arg >> 16); @@ -373,9 +378,37 @@ mmc_omap_xfer_done(struct mmc_omap_host *host, struct mmc_data *data) } static void +mmc_omap_send_abort(struct mmc_omap_host *host) +{ + struct mmc_omap_slot *slot = host->current_slot; + unsigned int restarts, passes, timeout; + u16 stat = 0; + + /* Sending abort takes 80 clocks. Have some extra and round up */ + timeout = (120*1000000 + slot->fclk_freq - 1)/slot->fclk_freq; + restarts = 0; + while (restarts < 10000) { + OMAP_MMC_WRITE(host, STAT, 0xFFFF); + OMAP_MMC_WRITE(host, CMD, (3 << 12) | (1 << 7)); + + passes = 0; + while (passes < timeout) { + stat = OMAP_MMC_READ(host, STAT); + if (stat & OMAP_MMC_STAT_END_OF_CMD) + goto out; + udelay(1); + passes++; + } + + restarts++; + } +out: + OMAP_MMC_WRITE(host, STAT, stat); +} + +static void mmc_omap_abort_xfer(struct mmc_omap_host *host, struct mmc_data *data) { - int loops; u16 ie; if (host->dma_in_use) @@ -386,16 +419,8 @@ mmc_omap_abort_xfer(struct mmc_omap_host *host, struct mmc_data *data) ie = OMAP_MMC_READ(host, IE); OMAP_MMC_WRITE(host, IE, 0); - OMAP_MMC_WRITE(host, CMD, 1 << 7); - loops = 0; - while (!(OMAP_MMC_READ(host, STAT) & OMAP_MMC_STAT_END_OF_CMD)) { - udelay(1); - loops++; - if (loops == 100000) - break; - } - OMAP_MMC_WRITE(host, STAT, OMAP_MMC_STAT_END_OF_CMD); OMAP_MMC_WRITE(host, IE, ie); + mmc_omap_send_abort(host); } static void @@ -451,6 +476,8 @@ mmc_omap_cmd_done(struct mmc_omap_host *host, struct mmc_command *cmd) { host->cmd = NULL; + del_timer(&host->cmd_timer); + if (cmd->flags & MMC_RSP_PRESENT) { if (cmd->flags & MMC_RSP_136) { /* response type 2 */ @@ -486,6 +513,47 @@ mmc_omap_cmd_done(struct mmc_omap_host *host, struct mmc_command *cmd) } } +/* + * Abort stuck command. Can occur when card is removed while it is being + * read. + */ +static void mmc_omap_abort_command(struct work_struct *work) +{ + struct mmc_omap_host *host = container_of(work, struct mmc_omap_host, + cmd_abort); + u16 ie; + + ie = OMAP_MMC_READ(host, IE); + OMAP_MMC_WRITE(host, IE, 0); + + if (!host->cmd) { + OMAP_MMC_WRITE(host, IE, ie); + return; + } + + dev_dbg(mmc_dev(host->mmc), "Aborting stuck command CMD%d\n", + host->cmd->opcode); + + if (host->data && host->dma_in_use) + mmc_omap_release_dma(host, host->data, 1); + + host->data = NULL; + host->sg_len = 0; + + mmc_omap_send_abort(host); + host->cmd->error = -ETIMEDOUT; + mmc_omap_cmd_done(host, host->cmd); + OMAP_MMC_WRITE(host, IE, ie); +} + +static void +mmc_omap_cmd_timer(unsigned long data) +{ + struct mmc_omap_host *host = (struct mmc_omap_host *) data; + + schedule_work(&host->cmd_abort); +} + /* PIO only */ static void mmc_omap_sg_to_buf(struct mmc_omap_host *host) @@ -1233,6 +1301,11 @@ static int __init mmc_omap_probe(struct platform_device *pdev) goto err_free_mem_region; } + INIT_WORK(&host->cmd_abort, mmc_omap_abort_command); + init_timer(&host->cmd_timer); + host->cmd_timer.function = mmc_omap_cmd_timer; + host->cmd_timer.data = (unsigned long) host; + spin_lock_init(&host->dma_lock); init_timer(&host->dma_timer); spin_lock_init(&host->slot_lock); |