MMC: OMAP: New release dma and abort xfer functions

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>
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>

1 files changed, 60 insertions, 19 deletions

diff --git a/drivers/mmc/host/omap.c b/drivers/mmc/host/omap.c
index 712a9608acf..90e9d68e799 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);
         }
 }