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Subject[PATCH V6 06/23] mmc: mmci: add dma_start callback
Date
From: Ludovic Barre <ludovic.barre@st.com>

This patch adds dma_start callback to mmci_host_ops.
Create a generic mmci_dma_start function which regroup
common action between variant.

Signed-off-by: Ludovic Barre <ludovic.barre@st.com>
---
drivers/mmc/host/mmci.c | 69 +++++++++++++++++++++++-----------------
drivers/mmc/host/mmci.h | 2 ++
drivers/mmc/host/mmci_qcom_dml.c | 1 +
3 files changed, 42 insertions(+), 30 deletions(-)

diff --git a/drivers/mmc/host/mmci.c b/drivers/mmc/host/mmci.c
index 8d483dd..72584f4 100644
--- a/drivers/mmc/host/mmci.c
+++ b/drivers/mmc/host/mmci.c
@@ -425,6 +425,41 @@ void mmci_get_next_data(struct mmci_host *host, struct mmc_data *data)
host->ops->get_next_data(host, data);
}

+int mmci_dma_start(struct mmci_host *host, unsigned int datactrl)
+{
+ struct mmc_data *data = host->data;
+ int ret;
+
+ if (!host->use_dma)
+ return -EINVAL;
+
+ ret = mmci_prep_data(host, data, false);
+ if (ret)
+ return ret;
+
+ if (!host->ops || !host->ops->dma_start)
+ return -EINVAL;
+
+ /* Okay, go for it. */
+ dev_vdbg(mmc_dev(host->mmc),
+ "Submit MMCI DMA job, sglen %d blksz %04x blks %04x flags %08x\n",
+ data->sg_len, data->blksz, data->blocks, data->flags);
+
+ host->ops->dma_start(host, &datactrl);
+
+ /* Trigger the DMA transfer */
+ mmci_write_datactrlreg(host, datactrl);
+
+ /*
+ * Let the MMCI say when the data is ended and it's time
+ * to fire next DMA request. When that happens, MMCI will
+ * call mmci_data_end()
+ */
+ writel(readl(host->base + MMCIMASK0) | MCI_DATAENDMASK,
+ host->base + MMCIMASK0);
+ return 0;
+}
+
static void
mmci_request_end(struct mmci_host *host, struct mmc_request *mrq)
{
@@ -736,23 +771,11 @@ int mmci_dmae_prep_data(struct mmci_host *host,
&dmae->desc_current);
}

-static int mmci_dma_start_data(struct mmci_host *host, unsigned int datactrl)
+int mmci_dmae_start(struct mmci_host *host, unsigned int *datactrl)
{
- int ret;
struct mmci_dmae_priv *dmae = host->dma_priv;
struct mmc_data *data = host->data;

- if (!host->use_dma)
- return -EINVAL;
-
- ret = mmci_dmae_prep_data(host, host->data, false);
- if (ret)
- return ret;
-
- /* Okay, go for it. */
- dev_vdbg(mmc_dev(host->mmc),
- "Submit MMCI DMA job, sglen %d blksz %04x blks %04x flags %08x\n",
- data->sg_len, data->blksz, data->blocks, data->flags);
host->dma_in_progress = true;
dmaengine_submit(dmae->desc_current);
dma_async_issue_pending(dmae->cur);
@@ -760,18 +783,8 @@ static int mmci_dma_start_data(struct mmci_host *host, unsigned int datactrl)
if (host->variant->qcom_dml)
dml_start_xfer(host, data);

- datactrl |= MCI_DPSM_DMAENABLE;
+ *datactrl |= MCI_DPSM_DMAENABLE;

- /* Trigger the DMA transfer */
- mmci_write_datactrlreg(host, datactrl);
-
- /*
- * Let the MMCI say when the data is ended and it's time
- * to fire next DMA request. When that happens, MMCI will
- * call mmci_data_end()
- */
- writel(readl(host->base + MMCIMASK0) | MCI_DATAENDMASK,
- host->base + MMCIMASK0);
return 0;
}

@@ -830,6 +843,7 @@ static struct mmci_host_ops mmci_variant_ops = {
.get_next_data = mmci_dmae_get_next_data,
.dma_setup = mmci_dmae_setup,
.dma_release = mmci_dmae_release,
+ .dma_start = mmci_dmae_start,
};

void mmci_variant_init(struct mmci_host *host)
@@ -847,11 +861,6 @@ static inline void mmci_dma_data_error(struct mmci_host *host)
{
}

-static inline int mmci_dma_start_data(struct mmci_host *host, unsigned int datactrl)
-{
- return -ENOSYS;
-}
-
#endif

static void mmci_pre_request(struct mmc_host *mmc, struct mmc_request *mrq)
@@ -948,7 +957,7 @@ static void mmci_start_data(struct mmci_host *host, struct mmc_data *data)
* Attempt to use DMA operation mode, if this
* should fail, fall back to PIO mode
*/
- if (!mmci_dma_start_data(host, datactrl))
+ if (!mmci_dma_start(host, datactrl))
return;

/* IRQ mode, map the SG list for CPU reading/writing */
diff --git a/drivers/mmc/host/mmci.h b/drivers/mmc/host/mmci.h
index a6a85aa..7bca597 100644
--- a/drivers/mmc/host/mmci.h
+++ b/drivers/mmc/host/mmci.h
@@ -280,6 +280,7 @@ struct mmci_host_ops {
void (*get_next_data)(struct mmci_host *host, struct mmc_data *data);
int (*dma_setup)(struct mmci_host *host);
void (*dma_release)(struct mmci_host *host);
+ int (*dma_start)(struct mmci_host *host, unsigned int *datactrl);
};

struct mmci_host {
@@ -339,4 +340,5 @@ void mmci_dmae_unprep_data(struct mmci_host *host, struct mmc_data *data,
void mmci_dmae_get_next_data(struct mmci_host *host, struct mmc_data *data);
int mmci_dmae_setup(struct mmci_host *host);
void mmci_dmae_release(struct mmci_host *host);
+int mmci_dmae_start(struct mmci_host *host, unsigned int *datactrl);

diff --git a/drivers/mmc/host/mmci_qcom_dml.c b/drivers/mmc/host/mmci_qcom_dml.c
index da4c43a..66af406 100644
--- a/drivers/mmc/host/mmci_qcom_dml.c
+++ b/drivers/mmc/host/mmci_qcom_dml.c
@@ -189,6 +189,7 @@ static struct mmci_host_ops qcom_variant_ops = {
.get_next_data = mmci_dmae_get_next_data,
.dma_setup = qcom_dma_setup,
.dma_release = mmci_dmae_release,
+ .dma_start = mmci_dmae_start,
};

void qcom_variant_init(struct mmci_host *host)
--
2.7.4
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