pre_req() runs dma_map_sg() post_req() runs dma_unmap_sg.
If not calling pre_req() before mxs_mmc_request(), request()
will prepare the cache just like it did it before.
It is optional to use pre_req() and post_req().
Signed-off-by: Shawn Guo <shawn....@linaro.org>
---
Changes since v1:
* Get dma_unmap_sg() call in mxs_mmc_request_done() non-blocking
drivers/mmc/host/mxs-mmc.c | 81 +++++++++++++++++++++++++++++++++++++++++---
1 files changed, 76 insertions(+), 5 deletions(-)
diff --git a/drivers/mmc/host/mxs-mmc.c b/drivers/mmc/host/mxs-mmc.c
index 99d39a6..235acfa 100644
--- a/drivers/mmc/host/mxs-mmc.c
+++ b/drivers/mmc/host/mxs-mmc.c
@@ -137,6 +137,10 @@
#define SSP_PIO_NUM 3
+struct mxs_mmc_next {
+ s32 cookie;
+};
+
struct mxs_mmc_host {
struct mmc_host *mmc;
struct mmc_request *mrq;
@@ -154,6 +158,7 @@ struct mxs_mmc_host {
struct mxs_dma_data dma_data;
unsigned int dma_dir;
u32 ssp_pio_words[SSP_PIO_NUM];
+ struct mxs_mmc_next next_data;
unsigned int version;
unsigned char bus_width;
@@ -236,8 +241,10 @@ static void mxs_mmc_request_done(struct mxs_mmc_host *host)
}
if (data) {
- dma_unmap_sg(mmc_dev(host->mmc), data->sg,
- data->sg_len, host->dma_dir);
+ if (!data->host_cookie)
+ dma_unmap_sg(mmc_dev(host->mmc), data->sg,
+ data->sg_len, host->dma_dir);
+
/*
* If there was an error on any block, we mark all
* data blocks as being in error.
@@ -302,6 +309,31 @@ static irqreturn_t mxs_mmc_irq_handler(int irq, void
*dev_id)
return IRQ_HANDLED;
}
+static int mxs_mmc_prep_dma_data(struct mxs_mmc_host *host,
+ struct mmc_data *data,
+ struct mxs_mmc_next *next)
+{
+ if (!next && data->host_cookie &&
+ data->host_cookie != host->next_data.cookie) {
+ printk(KERN_WARNING "[%s] invalid cookie: data->host_cookie %d"
+ " host->next_data.cookie %d\n",
+ __func__, data->host_cookie, host->next_data.cookie);
+ data->host_cookie = 0;
+ }
+
+ /* Check if next job is already prepared */
+ if (next || (!next && data->host_cookie != host->next_data.cookie))
+ if (dma_map_sg(mmc_dev(host->mmc), data->sg, data->sg_len,
+ (data->flags & MMC_DATA_WRITE) ?
+ DMA_TO_DEVICE : DMA_FROM_DEVICE) == 0)
+ return -EINVAL;
+
+ if (next)
+ data->host_cookie = ++next->cookie < 0 ? 1 : next->cookie;
+
+ return 0;
+}
+
static struct dma_async_tx_descriptor *mxs_mmc_prep_dma(
struct mxs_mmc_host *host, unsigned int append)
{
@@ -312,8 +344,8 @@ static struct dma_async_tx_descriptor *mxs_mmc_prep_dma(
if (data) {
/* data */
- dma_map_sg(mmc_dev(host->mmc), data->sg,
- data->sg_len, host->dma_dir);
+ if (mxs_mmc_prep_dma_data(host, data, NULL))
+ return NULL;
sgl = data->sg;
sg_len = data->sg_len;
} else {
@@ -328,9 +360,11 @@ static struct dma_async_tx_descriptor *mxs_mmc_prep_dma(
desc->callback = mxs_mmc_dma_irq_callback;
desc->callback_param = host;
} else {
- if (data)
+ if (data) {
dma_unmap_sg(mmc_dev(host->mmc), data->sg,
data->sg_len, host->dma_dir);
+ data->host_cookie = 0;
+ }
}
return desc;
@@ -553,6 +587,40 @@ static void mxs_mmc_start_cmd(struct mxs_mmc_host *host,
}
}
+static void mxs_mmc_pre_req(struct mmc_host *mmc, struct mmc_request *mrq,
+ bool is_first_req)
+{
+ struct mxs_mmc_host *host = mmc_priv(mmc);
+ struct mmc_data *data = mrq->data;
+
+ if (!data)
+ return;
+
+ if (data->host_cookie) {
+ data->host_cookie = 0;
+ return;
+ }
+
+ if (mxs_mmc_prep_dma_data(host, data, &host->next_data))
+ data->host_cookie = 0;
+}
+
+static void mxs_mmc_post_req(struct mmc_host *mmc, struct mmc_request *mrq,
+ int err)
+{
+ struct mxs_mmc_host *host = mmc_priv(mmc);
+ struct mmc_data *data = mrq->data;
+
+ if (!data)
+ return;
+
+ if (data->host_cookie) {
+ dma_unmap_sg(mmc_dev(host->mmc), data->sg,
+ data->sg_len, host->dma_dir);
+ data->host_cookie = 0;
+ }
+}
+
static void mxs_mmc_request(struct mmc_host *mmc, struct mmc_request *mrq)
{
struct mxs_mmc_host *host = mmc_priv(mmc);
@@ -644,6 +712,8 @@ static void mxs_mmc_enable_sdio_irq(struct mmc_host *mmc,
int enable)
}
static const struct mmc_host_ops mxs_mmc_ops = {
+ .pre_req = mxs_mmc_pre_req,
+ .post_req = mxs_mmc_post_req,
.request = mxs_mmc_request,
.get_ro = mxs_mmc_get_ro,
.get_cd = mxs_mmc_get_cd,
@@ -708,6 +778,7 @@ static int mxs_mmc_probe(struct platform_device *pdev)
host->dma_res = dmares;
host->irq = irq_err;
host->sdio_irq_en = 0;
+ host->next_data.cookie = 1;
host->clk = clk_get(&pdev->dev, NULL);
if (IS_ERR(host->clk)) {
--
1.7.4.1
--
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