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Subject[PATCH V6 02/23] mmc: mmci: introduce dma_priv pointer to mmci_host
Date
From: Ludovic Barre <ludovic.barre@st.com>

-Introduces dma_priv pointer to define specific
needs for each dma engine. This patch is needed to prepare
sdmmc variant with internal dma which not use dmaengine API.
-Moves next cookie to mmci host structure to share same cookie
management between all variants.

Signed-off-by: Ludovic Barre <ludovic.barre@st.com>
---
drivers/mmc/host/mmci.c | 144 ++++++++++++++++++++++++++++++------------------
drivers/mmc/host/mmci.h | 19 ++-----
2 files changed, 94 insertions(+), 69 deletions(-)

diff --git a/drivers/mmc/host/mmci.c b/drivers/mmc/host/mmci.c
index 120382b..922a47b 100644
--- a/drivers/mmc/host/mmci.c
+++ b/drivers/mmc/host/mmci.c
@@ -386,6 +386,9 @@ void mmci_dma_setup(struct mmci_host *host)
if (host->ops->dma_setup(host))
return;

+ /* initialize pre request cookie */
+ host->next_cookie = 1;
+
host->use_dma = true;
}

@@ -447,31 +450,50 @@ static void mmci_init_sg(struct mmci_host *host, struct mmc_data *data)
* no custom DMA interfaces are supported.
*/
#ifdef CONFIG_DMA_ENGINE
+struct mmci_dmae_next {
+ struct dma_async_tx_descriptor *desc;
+ struct dma_chan *chan;
+};
+
+struct mmci_dmae_priv {
+ struct dma_chan *cur;
+ struct dma_chan *rx_channel;
+ struct dma_chan *tx_channel;
+ struct dma_async_tx_descriptor *desc_current;
+ struct mmci_dmae_next next_data;
+};
+
int mmci_dmae_setup(struct mmci_host *host)
{
const char *rxname, *txname;
+ struct mmci_dmae_priv *dmae;

- host->dma_rx_channel = dma_request_slave_channel(mmc_dev(host->mmc), "rx");
- host->dma_tx_channel = dma_request_slave_channel(mmc_dev(host->mmc), "tx");
+ dmae = devm_kzalloc(mmc_dev(host->mmc), sizeof(*dmae), GFP_KERNEL);
+ if (!dmae)
+ return -ENOMEM;

- /* initialize pre request cookie */
- host->next_data.cookie = 1;
+ host->dma_priv = dmae;
+
+ dmae->rx_channel = dma_request_slave_channel(mmc_dev(host->mmc),
+ "rx");
+ dmae->tx_channel = dma_request_slave_channel(mmc_dev(host->mmc),
+ "tx");

/*
* If only an RX channel is specified, the driver will
* attempt to use it bidirectionally, however if it is
* is specified but cannot be located, DMA will be disabled.
*/
- if (host->dma_rx_channel && !host->dma_tx_channel)
- host->dma_tx_channel = host->dma_rx_channel;
+ if (dmae->rx_channel && !dmae->tx_channel)
+ dmae->tx_channel = dmae->rx_channel;

- if (host->dma_rx_channel)
- rxname = dma_chan_name(host->dma_rx_channel);
+ if (dmae->rx_channel)
+ rxname = dma_chan_name(dmae->rx_channel);
else
rxname = "none";

- if (host->dma_tx_channel)
- txname = dma_chan_name(host->dma_tx_channel);
+ if (dmae->tx_channel)
+ txname = dma_chan_name(dmae->tx_channel);
else
txname = "none";

@@ -482,22 +504,22 @@ int mmci_dmae_setup(struct mmci_host *host)
* Limit the maximum segment size in any SG entry according to
* the parameters of the DMA engine device.
*/
- if (host->dma_tx_channel) {
- struct device *dev = host->dma_tx_channel->device->dev;
+ if (dmae->tx_channel) {
+ struct device *dev = dmae->tx_channel->device->dev;
unsigned int max_seg_size = dma_get_max_seg_size(dev);

if (max_seg_size < host->mmc->max_seg_size)
host->mmc->max_seg_size = max_seg_size;
}
- if (host->dma_rx_channel) {
- struct device *dev = host->dma_rx_channel->device->dev;
+ if (dmae->rx_channel) {
+ struct device *dev = dmae->rx_channel->device->dev;
unsigned int max_seg_size = dma_get_max_seg_size(dev);

if (max_seg_size < host->mmc->max_seg_size)
host->mmc->max_seg_size = max_seg_size;
}

- if (!host->dma_tx_channel && !host->dma_rx_channel) {
+ if (!dmae->tx_channel || !dmae->rx_channel) {
mmci_dmae_release(host);
return -EINVAL;
}
@@ -511,21 +533,24 @@ int mmci_dmae_setup(struct mmci_host *host)
*/
void mmci_dmae_release(struct mmci_host *host)
{
- if (host->dma_rx_channel)
- dma_release_channel(host->dma_rx_channel);
- if (host->dma_tx_channel)
- dma_release_channel(host->dma_tx_channel);
- host->dma_rx_channel = host->dma_tx_channel = NULL;
+ struct mmci_dmae_priv *dmae = host->dma_priv;
+
+ if (dmae->rx_channel)
+ dma_release_channel(dmae->rx_channel);
+ if (dmae->tx_channel)
+ dma_release_channel(dmae->tx_channel);
+ dmae->rx_channel = dmae->tx_channel = NULL;
}

static void mmci_dma_unmap(struct mmci_host *host, struct mmc_data *data)
{
+ struct mmci_dmae_priv *dmae = host->dma_priv;
struct dma_chan *chan;

if (data->flags & MMC_DATA_READ)
- chan = host->dma_rx_channel;
+ chan = dmae->rx_channel;
else
- chan = host->dma_tx_channel;
+ chan = dmae->tx_channel;

dma_unmap_sg(chan->device->dev, data->sg, data->sg_len,
mmc_get_dma_dir(data));
@@ -533,14 +558,16 @@ static void mmci_dma_unmap(struct mmci_host *host, struct mmc_data *data)

static void mmci_dma_data_error(struct mmci_host *host)
{
+ struct mmci_dmae_priv *dmae = host->dma_priv;
+
if (!host->use_dma || !dma_inprogress(host))
return;

dev_err(mmc_dev(host->mmc), "error during DMA transfer!\n");
- dmaengine_terminate_all(host->dma_current);
+ dmaengine_terminate_all(dmae->cur);
host->dma_in_progress = false;
- host->dma_current = NULL;
- host->dma_desc_current = NULL;
+ dmae->cur = NULL;
+ dmae->desc_current = NULL;
host->data->host_cookie = 0;

mmci_dma_unmap(host, host->data);
@@ -548,6 +575,7 @@ static void mmci_dma_data_error(struct mmci_host *host)

static void mmci_dma_finalize(struct mmci_host *host, struct mmc_data *data)
{
+ struct mmci_dmae_priv *dmae = host->dma_priv;
u32 status;
int i;

@@ -586,8 +614,8 @@ static void mmci_dma_finalize(struct mmci_host *host, struct mmc_data *data)
}

host->dma_in_progress = false;
- host->dma_current = NULL;
- host->dma_desc_current = NULL;
+ dmae->cur = NULL;
+ dmae->desc_current = NULL;
}

/* prepares DMA channel and DMA descriptor, returns non-zero on failure */
@@ -595,6 +623,7 @@ static int __mmci_dma_prep_data(struct mmci_host *host, struct mmc_data *data,
struct dma_chan **dma_chan,
struct dma_async_tx_descriptor **dma_desc)
{
+ struct mmci_dmae_priv *dmae = host->dma_priv;
struct variant_data *variant = host->variant;
struct dma_slave_config conf = {
.src_addr = host->phybase + MMCIFIFO,
@@ -613,10 +642,10 @@ static int __mmci_dma_prep_data(struct mmci_host *host, struct mmc_data *data,

if (data->flags & MMC_DATA_READ) {
conf.direction = DMA_DEV_TO_MEM;
- chan = host->dma_rx_channel;
+ chan = dmae->rx_channel;
} else {
conf.direction = DMA_MEM_TO_DEV;
- chan = host->dma_tx_channel;
+ chan = dmae->tx_channel;
}

/* If there's no DMA channel, fall back to PIO */
@@ -656,25 +685,30 @@ static int __mmci_dma_prep_data(struct mmci_host *host, struct mmc_data *data,
static inline int mmci_dma_prep_data(struct mmci_host *host,
struct mmc_data *data)
{
+ struct mmci_dmae_priv *dmae = host->dma_priv;
+
/* Check if next job is already prepared. */
- if (host->dma_current && host->dma_desc_current)
+ if (dmae->cur && dmae->desc_current)
return 0;

/* No job were prepared thus do it now. */
- return __mmci_dma_prep_data(host, data, &host->dma_current,
- &host->dma_desc_current);
+ return __mmci_dma_prep_data(host, data, &dmae->cur,
+ &dmae->desc_current);
}

static inline int mmci_dma_prep_next(struct mmci_host *host,
struct mmc_data *data)
{
- struct mmci_host_next *nd = &host->next_data;
- return __mmci_dma_prep_data(host, data, &nd->dma_chan, &nd->dma_desc);
+ struct mmci_dmae_priv *dmae = host->dma_priv;
+ struct mmci_dmae_next *nd = &dmae->next_data;
+
+ return __mmci_dma_prep_data(host, data, &nd->chan, &nd->desc);
}

static int mmci_dma_start_data(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)
@@ -689,8 +723,8 @@ static int mmci_dma_start_data(struct mmci_host *host, unsigned int datactrl)
"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(host->dma_desc_current);
- dma_async_issue_pending(host->dma_current);
+ dmaengine_submit(dmae->desc_current);
+ dma_async_issue_pending(dmae->cur);

if (host->variant->qcom_dml)
dml_start_xfer(host, data);
@@ -712,25 +746,25 @@ static int mmci_dma_start_data(struct mmci_host *host, unsigned int datactrl)

static void mmci_get_next_data(struct mmci_host *host, struct mmc_data *data)
{
- struct mmci_host_next *next = &host->next_data;
+ struct mmci_dmae_priv *dmae = host->dma_priv;
+ struct mmci_dmae_next *next = &dmae->next_data;

if (!host->use_dma)
return;

- WARN_ON(data->host_cookie && data->host_cookie != next->cookie);
- WARN_ON(!data->host_cookie && (next->dma_desc || next->dma_chan));
+ WARN_ON(data->host_cookie && data->host_cookie != host->next_cookie);
+ WARN_ON(!data->host_cookie && (next->desc || next->chan));

- host->dma_desc_current = next->dma_desc;
- host->dma_current = next->dma_chan;
- next->dma_desc = NULL;
- next->dma_chan = NULL;
+ dmae->desc_current = next->desc;
+ dmae->cur = next->chan;
+ next->desc = NULL;
+ next->chan = NULL;
}

static void mmci_pre_request(struct mmc_host *mmc, struct mmc_request *mrq)
{
struct mmci_host *host = mmc_priv(mmc);
struct mmc_data *data = mrq->data;
- struct mmci_host_next *nd = &host->next_data;

if (!host->use_dma || !data)
return;
@@ -741,13 +775,15 @@ static void mmci_pre_request(struct mmc_host *mmc, struct mmc_request *mrq)
return;

if (!mmci_dma_prep_next(host, data))
- data->host_cookie = ++nd->cookie < 0 ? 1 : nd->cookie;
+ data->host_cookie = ++host->next_cookie < 0 ?
+ 1 : host->next_cookie;
}

static void mmci_post_request(struct mmc_host *mmc, struct mmc_request *mrq,
int err)
{
struct mmci_host *host = mmc_priv(mmc);
+ struct mmci_dmae_priv *dmae = host->dma_priv;
struct mmc_data *data = mrq->data;

if (!host->use_dma || !data || !data->host_cookie)
@@ -756,24 +792,24 @@ static void mmci_post_request(struct mmc_host *mmc, struct mmc_request *mrq,
mmci_dma_unmap(host, data);

if (err) {
- struct mmci_host_next *next = &host->next_data;
+ struct mmci_dmae_next *next = &dmae->next_data;
struct dma_chan *chan;
if (data->flags & MMC_DATA_READ)
- chan = host->dma_rx_channel;
+ chan = dmae->rx_channel;
else
- chan = host->dma_tx_channel;
+ chan = dmae->tx_channel;
dmaengine_terminate_all(chan);

- if (host->dma_desc_current == next->dma_desc)
- host->dma_desc_current = NULL;
+ if (dmae->desc_current == next->desc)
+ dmae->desc_current = NULL;

- if (host->dma_current == next->dma_chan) {
+ if (dmae->cur == next->chan) {
host->dma_in_progress = false;
- host->dma_current = NULL;
+ dmae->cur = NULL;
}

- next->dma_desc = NULL;
- next->dma_chan = NULL;
+ next->desc = NULL;
+ next->chan = NULL;
data->host_cookie = 0;
}
}
diff --git a/drivers/mmc/host/mmci.h b/drivers/mmc/host/mmci.h
index 34bb5e6..1d5ba4e 100644
--- a/drivers/mmc/host/mmci.h
+++ b/drivers/mmc/host/mmci.h
@@ -277,12 +277,6 @@ struct mmci_host_ops {
void (*dma_release)(struct mmci_host *host);
};

-struct mmci_host_next {
- struct dma_async_tx_descriptor *dma_desc;
- struct dma_chan *dma_chan;
- s32 cookie;
-};
-
struct mmci_host {
phys_addr_t phybase;
void __iomem *base;
@@ -325,19 +319,14 @@ struct mmci_host {
int (*get_rx_fifocnt)(struct mmci_host *h, u32 status, int remain);

u8 use_dma:1;
-#ifdef CONFIG_DMA_ENGINE
- /* DMA stuff */
- struct dma_chan *dma_current;
- struct dma_chan *dma_rx_channel;
- struct dma_chan *dma_tx_channel;
- struct dma_async_tx_descriptor *dma_desc_current;
- struct mmci_host_next next_data;
u8 dma_in_progress:1;
+ void *dma_priv;

-#define dma_inprogress(host) ((host)->dma_in_progress)
-#endif
+ s32 next_cookie;
};

+#define dma_inprogress(host) ((host)->dma_in_progress)
+
int mmci_dmae_setup(struct mmci_host *host);
void mmci_dmae_release(struct mmci_host *host);

--
2.7.4
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