[PATCH 07/18] MMC: OMAP: New release dma and abort xfer functions

Carlos Aguiar
2008-03-26T20:15:52Z

From: Juha Yrjola <juha.yrjola@solidboot.com>

New functions to support MMC multislot:
mmc_omap_release_dma() and mmc_omap_abort_xfer().

Signed-off-by: Juha Yrjola <juha.yrjola@solidboot.com>
Signed-off-by: Carlos Eduardo Aguiar <carlos.aguiar@indt.org.br>
Signed-off-by: Tony Lindgren <tony@atomide.com>
---
drivers/mmc/host/omap.c | 79 +++++++++++++++++++++++++++++++++++-----------
1 files changed, 60 insertions(+), 19 deletions(-)

diff --git a/drivers/mmc/host/omap.c b/drivers/mmc/host/omap.c
index fc46a70..f652de9 100644
--- a/drivers/mmc/host/omap.c
+++ b/drivers/mmc/host/omap.c
@@ -327,26 +327,32 @@ mmc_omap_start_command(struct mmc_omap_host *host, struct mmc_command *cmd)
}

static void
+mmc_omap_release_dma(struct mmc_omap_host *host, struct mmc_data *data,
+ int abort)
+{
+ enum dma_data_direction dma_data_dir;
+
+ BUG_ON(host->dma_ch < 0);
+ if (data->error)
+ omap_stop_dma(host->dma_ch);
+ /* Release DMA channel lazily */
+ mod_timer(&host->dma_timer, jiffies + HZ);
+ if (data->flags & MMC_DATA_WRITE)
+ dma_data_dir = DMA_TO_DEVICE;
+ else
+ dma_data_dir = DMA_FROM_DEVICE;
+ dma_unmap_sg(mmc_dev(host->mmc), data->sg, host->sg_len,
+ dma_data_dir);
+}
+
+static void
mmc_omap_xfer_done(struct mmc_omap_host *host, struct mmc_data *data)
{
- if (host->dma_in_use) {
- enum dma_data_direction dma_data_dir;
-
- BUG_ON(host->dma_ch < 0);
- if (data->error)
- omap_stop_dma(host->dma_ch);
- /* Release DMA channel lazily */
- mod_timer(&host->dma_timer, jiffies + HZ);
- if (data->flags & MMC_DATA_WRITE)
- dma_data_dir = DMA_TO_DEVICE;
- else
- dma_data_dir = DMA_FROM_DEVICE;
- dma_unmap_sg(mmc_dev(host->mmc), data->sg, host->sg_len,
- dma_data_dir);
- }
+ if (host->dma_in_use)
+ mmc_omap_release_dma(host, data, data->error);
+
host->data = NULL;
host->sg_len = 0;
- clk_disable(host->fclk);

/* NOTE: MMC layer will sometimes poll-wait CMD13 next, issuing
* dozens of requests until the card finishes writing data.
@@ -354,8 +360,12 @@ mmc_omap_xfer_done(struct mmc_omap_host *host, struct mmc_data *data)
*/

if (!data->stop) {
+ struct mmc_host *mmc;
+
host->mrq = NULL;
- mmc_request_done(host->mmc, data->mrq);
+ mmc = host->mmc;
+ mmc_omap_release_slot(host->current_slot);
+ mmc_request_done(mmc, data->mrq);
return;
}

@@ -363,6 +373,32 @@ mmc_omap_xfer_done(struct mmc_omap_host *host, struct mmc_data *data)
}

static void
+mmc_omap_abort_xfer(struct mmc_omap_host *host, struct mmc_data *data)
+{
+ int loops;
+ u16 ie;
+
+ if (host->dma_in_use)
+ mmc_omap_release_dma(host, data, 1);
+
+ host->data = NULL;
+ host->sg_len = 0;
+
+ 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);
+}
+
+static void
mmc_omap_end_of_data(struct mmc_omap_host *host, struct mmc_data *data)
{
unsigned long flags;
@@ -439,9 +475,14 @@ mmc_omap_cmd_done(struct mmc_omap_host *host, struct mmc_command *cmd)
}

if (host->data == NULL || cmd->error) {
+ struct mmc_host *mmc;
+
+ if (host->data != NULL)
+ mmc_omap_abort_xfer(host, host->data);
host->mrq = NULL;
- clk_disable(host->fclk);
- mmc_request_done(host->mmc, cmd->mrq);
+ mmc = host->mmc;
+ mmc_omap_release_slot(host->current_slot);
+ mmc_request_done(mmc, cmd->mrq);
}
}

-- 1.5.3.GIT