mmc: dw_mmc: Support predefined mutiple block transfers

This patch adds the support for predefined multiple block r/w.
dw_mmc can support MMC_CAP_CMD23 capability.

Signed-off-by: Seungwon Jeon <tgih.jun@samsung.com>
Acked-by: Will Newton <will.newton@imgtec.com>
Signed-off-by: Chris Ball <cjb@laptop.org>

diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c
index 9b839fa..c583b94 100644 (file)
--- a/drivers/mmc/host/dw_mmc.c
+++ b/drivers/mmc/host/dw_mmc.c
@@ -588,11 +588,11 @@ static void dw_mci_setup_bus(struct dw_mci_slot *slot)
        mci_writel(host, CTYPE, (slot->ctype << slot->id));
 }
 
-static void dw_mci_start_request(struct dw_mci *host,
-                                struct dw_mci_slot *slot)
+static void __dw_mci_start_request(struct dw_mci *host,
+                                  struct dw_mci_slot *slot,
+                                  struct mmc_command *cmd)
 {
        struct mmc_request *mrq;
-       struct mmc_command *cmd;
        struct mmc_data *data;
        u32 cmdflags;
 
@@ -610,14 +610,13 @@ static void dw_mci_start_request(struct dw_mci *host,
        host->completed_events = 0;
        host->data_status = 0;
 
-       data = mrq->data;
+       data = cmd->data;
        if (data) {
                dw_mci_set_timeout(host);
                mci_writel(host, BYTCNT, data->blksz*data->blocks);
                mci_writel(host, BLKSIZ, data->blksz);
        }
 
-       cmd = mrq->cmd;
        cmdflags = dw_mci_prepare_command(slot->mmc, cmd);
 
        /* this is the first command, send the initialization clock */
@@ -635,6 +634,16 @@ static void dw_mci_start_request(struct dw_mci *host,
                host->stop_cmdr = dw_mci_prepare_command(slot->mmc, mrq->stop);
 }
 
+static void dw_mci_start_request(struct dw_mci *host,
+                                struct dw_mci_slot *slot)
+{
+       struct mmc_request *mrq = slot->mrq;
+       struct mmc_command *cmd;
+
+       cmd = mrq->sbc ? mrq->sbc : mrq->cmd;
+       __dw_mci_start_request(host, slot, cmd);
+}
+
 /* must be called with host->lock held */
 static void dw_mci_queue_request(struct dw_mci *host, struct dw_mci_slot *slot,
                                 struct mmc_request *mrq)
@@ -889,7 +898,14 @@ static void dw_mci_tasklet_func(unsigned long priv)
                        cmd = host->cmd;
                        host->cmd = NULL;
                        set_bit(EVENT_CMD_COMPLETE, &host->completed_events);
-                       dw_mci_command_complete(host, host->mrq->cmd);
+                       dw_mci_command_complete(host, cmd);
+                       if (cmd == host->mrq->sbc && !cmd->error) {
+                               prev_state = state = STATE_SENDING_CMD;
+                               __dw_mci_start_request(host, host->cur_slot,
+                                                      host->mrq->cmd);
+                               goto unlock;
+                       }
+
                        if (!host->mrq->data || cmd->error) {
                                dw_mci_request_end(host, host->mrq);
                                goto unlock;
@@ -967,6 +983,12 @@ static void dw_mci_tasklet_func(unsigned long priv)
                                goto unlock;
                        }
 
+                       if (host->mrq->sbc && !data->error) {
+                               data->stop->error = 0;
+                               dw_mci_request_end(host, host->mrq);
+                               goto unlock;
+                       }
+
                        prev_state = state = STATE_SENDING_STOP;
                        if (!data->error)
                                send_stop_cmd(host, data);