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mmc: mxs-mmc: move to use generic DMA helper

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With the generic DMA device tree helper supported by mxs-dma driver,
client devices only need to call dma_request_slave_channel() for
requesting a DMA channel from dmaengine.

Since mxs is a DT only platform now, along with the changes, the non-DT
case checking in probe function also gets cleaned up.

Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Cc: Chris Ball <cjb@laptop.org>
Cc: linux-mmc@vger.kernel.org
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
This commit is contained in:
Shawn Guo 2013-02-26 10:10:38 +08:00
parent d84f638b03
commit 0e91e434c8
2 changed files with 13 additions and 47 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
Documentation/devicetree/bindings/mmc/mxs-mmc.txt
View File

@ -9,15 +9,19 @@ and the properties used by the mxsmmc driver.
Required properties:
- compatible: Should be "fsl,<chip>-mmc". The supported chips include
imx23 and imx28.
- interrupts: Should contain ERROR and DMA interrupts
- fsl,ssp-dma-channel: APBH DMA channel for the SSP
- interrupts: Should contain ERROR interrupt number
- dmas: DMA specifier, consisting of a phandle to DMA controller node
and SSP DMA channel ID.
Refer to dma.txt and fsl-mxs-dma.txt for details.
- dma-names: Must be "rx-tx".
Examples:
ssp0: ssp@80010000 {
compatible = "fsl,imx28-mmc";
reg = <0x80010000 2000>;
interrupts = <96 82>;
fsl,ssp-dma-channel = <0>;
interrupts = <96>;
dmas = <&dma_apbh 0>;
dma-names = "rx-tx";
bus-width = <8>;
};

48
drivers/mmc/host/mxs-mmc.c
View File

@ -548,22 +548,6 @@ static const struct mmc_host_ops mxs_mmc_ops = {
.enable_sdio_irq = mxs_mmc_enable_sdio_irq,
};
static bool mxs_mmc_dma_filter(struct dma_chan *chan, void *param)
{
struct mxs_mmc_host *host = param;
struct mxs_ssp *ssp = &host->ssp;
if (!mxs_dma_is_apbh(chan))
return false;
if (chan->chan_id != ssp->dma_channel)
return false;
chan->private = &ssp->dma_data;
return true;
}
static struct platform_device_id mxs_ssp_ids[] = {
{
.name = "imx23-mmc",
@ -591,20 +575,17 @@ static int mxs_mmc_probe(struct platform_device *pdev)
struct device_node *np = pdev->dev.of_node;
struct mxs_mmc_host *host;
struct mmc_host *mmc;
struct resource *iores, *dmares;
struct resource *iores;
struct pinctrl *pinctrl;
int ret = 0, irq_err, irq_dma;
dma_cap_mask_t mask;
int ret = 0, irq_err;
struct regulator *reg_vmmc;
enum of_gpio_flags flags;
struct mxs_ssp *ssp;
u32 bus_width = 0;
iores = platform_get_resource(pdev, IORESOURCE_MEM, 0);
dmares = platform_get_resource(pdev, IORESOURCE_DMA, 0);
irq_err = platform_get_irq(pdev, 0);
irq_dma = platform_get_irq(pdev, 1);
if (!iores || irq_err < 0 || irq_dma < 0)
if (!iores || irq_err < 0)
return -EINVAL;
mmc = mmc_alloc_host(sizeof(struct mxs_mmc_host), &pdev->dev);
@ -620,23 +601,7 @@ static int mxs_mmc_probe(struct platform_device *pdev)
goto out_mmc_free;
}
if (np) {
ssp->devid = (enum mxs_ssp_id) of_id->data;
/*
* TODO: This is a temporary solution and should be changed
* to use generic DMA binding later when the helpers get in.
*/
ret = of_property_read_u32(np, "fsl,ssp-dma-channel",
&ssp->dma_channel);
if (ret) {
dev_err(mmc_dev(host->mmc),
"failed to get dma channel\n");
goto out_mmc_free;
}
} else {
ssp->devid = pdev->id_entry->driver_data;
ssp->dma_channel = dmares->start;
}
ssp->devid = (enum mxs_ssp_id) of_id->data;
host->mmc = mmc;
host->sdio_irq_en = 0;
@ -666,10 +631,7 @@ static int mxs_mmc_probe(struct platform_device *pdev)
mxs_mmc_reset(host);
dma_cap_zero(mask);
dma_cap_set(DMA_SLAVE, mask);
ssp->dma_data.chan_irq = irq_dma;
ssp->dmach = dma_request_channel(mask, mxs_mmc_dma_filter, host);
ssp->dmach = dma_request_slave_channel(&pdev->dev, "rx-tx");
if (!ssp->dmach) {
dev_err(mmc_dev(host->mmc),
"%s: failed to request dma\n", __func__);