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dmaengine: at_hdmac: add device tree support

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Add device tree probe support for atmel at_hdmac DMA driver.
Bindings are added to specify DMA controller configuration.

Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Acked-by: Grant Likely <grant.likely@secretlab.ca>
Signed-off-by: Vinod Koul <vinod.koul@linux.intel.com>
This commit is contained in:
Nicolas Ferre 2011-10-17 14:56:41 +02:00 committed by Vinod Koul
parent 67348450b8
commit c511595390
2 changed files with 45 additions and 1 deletions
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14
Documentation/devicetree/bindings/dma/atmel-dma.txt Normal file
View file

@ -0,0 +1,14 @@
* Atmel Direct Memory Access Controller (DMA)
Required properties:
- compatible: Should be "atmel,<chip>-dma"
- reg: Should contain DMA registers location and length
- interrupts: Should contain DMA interrupt
Examples:
dma@ffffec00 {
compatible = "atmel,at91sam9g45-dma";
reg = <0xffffec00 0x200>;
interrupts = <21>;
};

32
drivers/dma/at_hdmac.c
View file

@ -23,6 +23,8 @@
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include "at_hdmac_regs.h"
@ -1175,6 +1177,20 @@ static void atc_free_chan_resources(struct dma_chan *chan)
/*-- Module Management -----------------------------------------------*/
#if defined(CONFIG_OF)
static const struct of_device_id atmel_dma_dt_ids[] = {
{
.compatible = "atmel,at91sam9rl-dma",
.data = (void *)ATDMA_DEVTYPE_SAM9RL
}, {
.compatible = "atmel,at91sam9g45-dma",
.data = (void *)ATDMA_DEVTYPE_SAM9G45
}, { /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, atmel_dma_dt_ids);
#endif
static struct platform_device_id atdma_devtypes[] = {
{
.name = "at91sam9rl_dma",
@ -1187,6 +1203,19 @@ static struct platform_device_id atdma_devtypes[] = {
}
};
static inline enum atdma_devtype __init at_dma_get_driver_data(
struct platform_device *pdev)
{
if (pdev->dev.of_node) {
const struct of_device_id *match;
match = of_match_node(atmel_dma_dt_ids, pdev->dev.of_node);
if (match == NULL)
return ATDMA_DEVTYPE_UNDEFINED;
return (enum atdma_devtype)match->data;
}
return platform_get_device_id(pdev)->driver_data;
}
/**
* at_dma_off - disable DMA controller
* @atdma: the Atmel HDAMC device
@ -1218,7 +1247,7 @@ static int __init at_dma_probe(struct platform_device *pdev)
dma_cap_set(DMA_MEMCPY, cap_mask);
/* get DMA parameters from controller type */
atdmatype = platform_get_device_id(pdev)->driver_data;
atdmatype = at_dma_get_driver_data(pdev);
switch (atdmatype) {
case ATDMA_DEVTYPE_SAM9RL:
@ -1526,6 +1555,7 @@ static struct platform_driver at_dma_driver = {
.driver = {
.name = "at_hdmac",
.pm = &at_dma_dev_pm_ops,
.of_match_table = of_match_ptr(atmel_dma_dt_ids),
},
};