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Subject[PATCH 7/7 v2] mmc: sh_mmcif: switch to the new DMA channel allocation and configuration
Date
Using the "private" field from struct dma_chan is deprecated. The sh
dmaengine driver now also supports the preferred DMA channel allocation
and configuration method, using a standard filter function and a channel
configuration operation. This patch updates sh_mmcif to use this new
method.

Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Cc: Chris Ball <cjb@laptop.org>
---
drivers/mmc/host/sh_mmcif.c | 90 ++++++++++++++++++++++++------------------
1 files changed, 51 insertions(+), 39 deletions(-)

diff --git a/drivers/mmc/host/sh_mmcif.c b/drivers/mmc/host/sh_mmcif.c
index 9e3b9b1..0f07d28 100644
--- a/drivers/mmc/host/sh_mmcif.c
+++ b/drivers/mmc/host/sh_mmcif.c
@@ -211,8 +211,6 @@ struct sh_mmcif_host {
struct mmc_host *mmc;
struct mmc_request *mrq;
struct platform_device *pd;
- struct sh_dmae_slave dma_slave_tx;
- struct sh_dmae_slave dma_slave_rx;
struct clk *hclk;
unsigned int clk;
int bus_width;
@@ -371,52 +369,66 @@ static void sh_mmcif_start_dma_tx(struct sh_mmcif_host *host)
desc, cookie);
}

-static bool sh_mmcif_filter(struct dma_chan *chan, void *arg)
-{
- dev_dbg(chan->device->dev, "%s: slave data %p\n", __func__, arg);
- chan->private = arg;
- return true;
-}
-
static void sh_mmcif_request_dma(struct sh_mmcif_host *host,
struct sh_mmcif_plat_data *pdata)
{
- struct sh_dmae_slave *tx, *rx;
+ struct resource *res = platform_get_resource(host->pd, IORESOURCE_MEM, 0);
+ struct dma_slave_config cfg;
+ dma_cap_mask_t mask;
+ int ret;
+
host->dma_active = false;

+ if (pdata->slave_id_tx <= 0 || pdata->slave_id_rx <= 0)
+ return;
+
/* We can only either use DMA for both Tx and Rx or not use it at all */
- tx = &host->dma_slave_tx;
- tx->shdma_slave.slave_id = pdata->slave_id_tx;
- rx = &host->dma_slave_rx;
- rx->shdma_slave.slave_id = pdata->slave_id_rx;
+ dma_cap_zero(mask);
+ dma_cap_set(DMA_SLAVE, mask);
+
+ host->chan_tx = dma_request_channel(mask, shdma_chan_filter,
+ (void *)pdata->slave_id_tx);
+ dev_dbg(&host->pd->dev, "%s: TX: got channel %p\n", __func__,
+ host->chan_tx);

- if (tx->shdma_slave.slave_id > 0 && rx->shdma_slave.slave_id > 0) {
- dma_cap_mask_t mask;
+ if (!host->chan_tx)
+ return;

- dma_cap_zero(mask);
- dma_cap_set(DMA_SLAVE, mask);
+ cfg.slave_id = pdata->slave_id_tx;
+ cfg.direction = DMA_MEM_TO_DEV;
+ cfg.dst_addr = res->start + MMCIF_CE_DATA;
+ cfg.src_addr = 0;
+ ret = dmaengine_slave_config(host->chan_tx, &cfg);
+ if (ret < 0)
+ goto ecfgtx;

- host->chan_tx = dma_request_channel(mask, sh_mmcif_filter,
- &tx->shdma_slave);
- dev_dbg(&host->pd->dev, "%s: TX: got channel %p\n", __func__,
- host->chan_tx);
+ host->chan_rx = dma_request_channel(mask, shdma_chan_filter,
+ (void *)pdata->slave_id_rx);
+ dev_dbg(&host->pd->dev, "%s: RX: got channel %p\n", __func__,
+ host->chan_rx);

- if (!host->chan_tx)
- return;
+ if (!host->chan_rx)
+ goto erqrx;

- host->chan_rx = dma_request_channel(mask, sh_mmcif_filter,
- &rx->shdma_slave);
- dev_dbg(&host->pd->dev, "%s: RX: got channel %p\n", __func__,
- host->chan_rx);
+ cfg.slave_id = pdata->slave_id_rx;
+ cfg.direction = DMA_DEV_TO_MEM;
+ cfg.dst_addr = 0;
+ cfg.src_addr = res->start + MMCIF_CE_DATA;
+ ret = dmaengine_slave_config(host->chan_rx, &cfg);
+ if (ret < 0)
+ goto ecfgrx;

- if (!host->chan_rx) {
- dma_release_channel(host->chan_tx);
- host->chan_tx = NULL;
- return;
- }
+ init_completion(&host->dma_complete);

- init_completion(&host->dma_complete);
- }
+ return;
+
+ecfgrx:
+ dma_release_channel(host->chan_rx);
+ host->chan_rx = NULL;
+erqrx:
+ecfgtx:
+ dma_release_channel(host->chan_tx);
+ host->chan_tx = NULL;
}

static void sh_mmcif_release_dma(struct sh_mmcif_host *host)
--
1.7.2.5


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