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: Tony Lindgren <tony@atomide.com>

diff --git a/drivers/mmc/host/omap.c b/drivers/mmc/host/omap.c
index d91747364178b27af410f9086f23919353275d14..ccba94e619d7ad753e34712cfbc15b936ad804f8 100644 (file)
--- a/drivers/mmc/host/omap.c
+++ b/drivers/mmc/host/omap.c
@@ -342,27 +342,33 @@ mmc_omap_start_command(struct mmc_omap_host *host, struct mmc_command *cmd)
        OMAP_MMC_WRITE(host, CMD, cmdreg);
 }
 
+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.
@@ -370,14 +376,44 @@ 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;
        }
 
        mmc_omap_start_command(host, data->stop);
 }
 
+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)
 {
@@ -455,9 +491,14 @@ 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);
        }
 }