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dmaengine: imx-sdma: add device tree probe support 

It adds device tree probe support for imx-sdma driver.

Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Cc: Grant Likely <grant.likely@secretlab.ca>
Cc: Vinod Koul <vinod.koul@intel.com>
Cc: Sascha Hauer <s.hauer@pengutronix.de>
Acked-by: Vinod Koul <vinod.koul@intel.com>
This commit is contained in:
Shawn Guo 2011-07-14 08:35:48 +08:00
parent 40ad5b3791
commit 580975d7f4
2 changed files with 56 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

17
Documentation/devicetree/bindings/dma/fsl-imx-sdma.txt Normal file
View File

@ -0,0 +1,17 @@
* Freescale Smart Direct Memory Access (SDMA) Controller for i.MX
Required properties:
- compatible : Should be "fsl,<chip>-sdma"
- reg : Should contain SDMA registers location and length
- interrupts : Should contain SDMA interrupt
- fsl,sdma-ram-script-name : Should contain the full path of SDMA RAM
scripts firmware
Examples:
sdma@83fb0000 {
compatible = "fsl,imx51-sdma", "fsl,imx35-sdma";
reg = <0x83fb0000 0x4000>;
interrupts = <6>;
fsl,sdma-ram-script-name = "sdma-imx51.bin";
};

42
drivers/dma/imx-sdma.c
View File

@ -32,6 +32,8 @@
#include <linux/slab.h>
#include <linux/platform_device.h>
#include <linux/dmaengine.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <asm/irq.h>
#include <mach/sdma.h>
@ -332,6 +334,13 @@ static struct platform_device_id sdma_devtypes[] = {
};
MODULE_DEVICE_TABLE(platform, sdma_devtypes);
static const struct of_device_id sdma_dt_ids[] = {
{ .compatible = "fsl,imx31-sdma", .data = &sdma_devtypes[IMX31_SDMA], },
{ .compatible = "fsl,imx35-sdma", .data = &sdma_devtypes[IMX35_SDMA], },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, sdma_dt_ids);
#define SDMA_H_CONFIG_DSPDMA (1 << 12) /* indicates if the DSPDMA is used */
#define SDMA_H_CONFIG_RTD_PINS (1 << 11) /* indicates if Real-Time Debug pins are enabled */
#define SDMA_H_CONFIG_ACR (1 << 4) /* indicates if AHB freq /core freq = 2 or 1 */
@ -1250,6 +1259,10 @@ err_dma_alloc:
static int __init sdma_probe(struct platform_device *pdev)
{
const struct of_device_id *of_id =
of_match_device(sdma_dt_ids, &pdev->dev);
struct device_node *np = pdev->dev.of_node;
const char *fw_name;
int ret;
int irq;
struct resource *iores;
@ -1265,7 +1278,7 @@ static int __init sdma_probe(struct platform_device *pdev)
iores = platform_get_resource(pdev, IORESOURCE_MEM, 0);
irq = platform_get_irq(pdev, 0);
if (!iores || irq < 0 || !pdata) {
if (!iores || irq < 0) {
ret = -EINVAL;
goto err_irq;
}
@ -1295,6 +1308,8 @@ static int __init sdma_probe(struct platform_device *pdev)
if (!sdma->script_addrs)
goto err_alloc;
if (of_id)
pdev->id_entry = of_id->data;
sdma->devtype = pdev->id_entry->driver_data;
dma_cap_set(DMA_SLAVE, sdma->dma_device.cap_mask);
@ -1325,10 +1340,30 @@ static int __init sdma_probe(struct platform_device *pdev)
if (ret)
goto err_init;
if (pdata->script_addrs)
if (pdata && pdata->script_addrs)
sdma_add_scripts(sdma, pdata->script_addrs);
sdma_get_firmware(sdma, pdata->fw_name);
if (pdata) {
sdma_get_firmware(sdma, pdata->fw_name);
} else {
/*
* Because that device tree does not encode ROM script address,
* the RAM script in firmware is mandatory for device tree
* probe, otherwise it fails.
*/
ret = of_property_read_string(np, "fsl,sdma-ram-script-name",
&fw_name);
if (ret) {
dev_err(&pdev->dev, "failed to get firmware name\n");
goto err_init;
}
ret = sdma_get_firmware(sdma, fw_name);
if (ret) {
dev_err(&pdev->dev, "failed to get firmware\n");
goto err_init;
}
}
sdma->dma_device.dev = &pdev->dev;
@ -1376,6 +1411,7 @@ static int __exit sdma_remove(struct platform_device *pdev)
static struct platform_driver sdma_driver = {
.driver = {
.name = "imx-sdma",
.of_match_table = sdma_dt_ids,
},
.id_table = sdma_devtypes,
.remove = __exit_p(sdma_remove),