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mmc: sdhi/tmio: add DT DMA support

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Add support for initialising DMA from the Device Tree.

Signed-off-by: Guennadi Liakhovetski <g.liakhovetski+renesas@gmail.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
This commit is contained in:
Guennadi Liakhovetski 2013-04-26 17:47:19 +02:00 committed by Chris Ball
parent eec95ee226
commit 87ae7bbebd
2 changed files with 19 additions and 14 deletions
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14
drivers/mmc/host/sh_mobile_sdhi.c
View file

@ -144,6 +144,7 @@ static int sh_mobile_sdhi_probe(struct platform_device *pdev)
struct tmio_mmc_host *host;
int irq, ret, i = 0;
bool multiplexed_isr = true;
struct tmio_mmc_dma *dma_priv;
priv = devm_kzalloc(&pdev->dev, sizeof(struct sh_mobile_sdhi), GFP_KERNEL);
if (priv == NULL) {
@ -152,6 +153,7 @@ static int sh_mobile_sdhi_probe(struct platform_device *pdev)
}
mmc_data = &priv->mmc_data;
dma_priv = &priv->dma_priv;
if (p) {
if (p->init) {
@ -184,8 +186,6 @@ static int sh_mobile_sdhi_probe(struct platform_device *pdev)
mmc_data->get_cd = sh_mobile_sdhi_get_cd;
if (p->dma_slave_tx > 0 && p->dma_slave_rx > 0) {
struct tmio_mmc_dma *dma_priv = &priv->dma_priv;
/*
* Yes, we have to provide slave IDs twice to TMIO:
* once as a filter parameter and once for channel
@ -195,14 +195,14 @@ static int sh_mobile_sdhi_probe(struct platform_device *pdev)
dma_priv->chan_priv_rx = (void *)p->dma_slave_rx;
dma_priv->slave_id_tx = p->dma_slave_tx;
dma_priv->slave_id_rx = p->dma_slave_rx;
dma_priv->alignment_shift = 1; /* 2-byte alignment */
dma_priv->filter = shdma_chan_filter;
mmc_data->dma = dma_priv;
}
}
dma_priv->alignment_shift = 1; /* 2-byte alignment */
dma_priv->filter = shdma_chan_filter;
mmc_data->dma = dma_priv;
/*
* All SDHI blocks support 2-byte and larger block sizes in 4-bit
* bus width mode.

19
drivers/mmc/host/tmio_mmc_dma.c
View file

@ -264,7 +264,8 @@ static void tmio_mmc_tasklet_fn(unsigned long arg)
void tmio_mmc_request_dma(struct tmio_mmc_host *host, struct tmio_mmc_data *pdata)
{
/* We can only either use DMA for both Tx and Rx or not use it at all */
if (!pdata->dma)
if (!pdata->dma || (!host->pdev->dev.of_node &&
(!pdata->dma->chan_priv_tx || !pdata->dma->chan_priv_rx)))
return;
if (!host->chan_tx && !host->chan_rx) {
@ -280,15 +281,17 @@ void tmio_mmc_request_dma(struct tmio_mmc_host *host, struct tmio_mmc_data *pdat
dma_cap_zero(mask);
dma_cap_set(DMA_SLAVE, mask);
host->chan_tx = dma_request_channel(mask, pdata->dma->filter,
pdata->dma->chan_priv_tx);
host->chan_tx = dma_request_slave_channel_compat(mask,
pdata->dma->filter, pdata->dma->chan_priv_tx,
&host->pdev->dev, "tx");
dev_dbg(&host->pdev->dev, "%s: TX: got channel %p\n", __func__,
host->chan_tx);
if (!host->chan_tx)
return;
cfg.slave_id = pdata->dma->slave_id_tx;
if (pdata->dma->chan_priv_tx)
cfg.slave_id = pdata->dma->slave_id_tx;
cfg.direction = DMA_MEM_TO_DEV;
cfg.dst_addr = res->start + (CTL_SD_DATA_PORT << host->bus_shift);
cfg.src_addr = 0;
@ -296,15 +299,17 @@ void tmio_mmc_request_dma(struct tmio_mmc_host *host, struct tmio_mmc_data *pdat
if (ret < 0)
goto ecfgtx;
host->chan_rx = dma_request_channel(mask, pdata->dma->filter,
pdata->dma->chan_priv_rx);
host->chan_rx = dma_request_slave_channel_compat(mask,
pdata->dma->filter, pdata->dma->chan_priv_rx,
&host->pdev->dev, "rx");
dev_dbg(&host->pdev->dev, "%s: RX: got channel %p\n", __func__,
host->chan_rx);
if (!host->chan_rx)
goto ereqrx;
cfg.slave_id = pdata->dma->slave_id_rx;
if (pdata->dma->chan_priv_rx)
cfg.slave_id = pdata->dma->slave_id_rx;
cfg.direction = DMA_DEV_TO_MEM;
cfg.src_addr = cfg.dst_addr;
cfg.dst_addr = 0;