dmaengine: at_hdmac: add device tree support
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>
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14
Documentation/devicetree/bindings/dma/atmel-dma.txt
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14
Documentation/devicetree/bindings/dma/atmel-dma.txt
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@ -0,0 +1,14 @@
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* Atmel Direct Memory Access Controller (DMA)
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Required properties:
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- compatible: Should be "atmel,<chip>-dma"
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- reg: Should contain DMA registers location and length
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- interrupts: Should contain DMA interrupt
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Examples:
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dma@ffffec00 {
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compatible = "atmel,at91sam9g45-dma";
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reg = <0xffffec00 0x200>;
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interrupts = <21>;
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};
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@ -23,6 +23,8 @@
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include <linux/of.h>
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#include <linux/of_device.h>
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#include "at_hdmac_regs.h"
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@ -1175,6 +1177,20 @@ static void atc_free_chan_resources(struct dma_chan *chan)
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/*-- Module Management -----------------------------------------------*/
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#if defined(CONFIG_OF)
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static const struct of_device_id atmel_dma_dt_ids[] = {
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{
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.compatible = "atmel,at91sam9rl-dma",
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.data = (void *)ATDMA_DEVTYPE_SAM9RL
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}, {
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.compatible = "atmel,at91sam9g45-dma",
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.data = (void *)ATDMA_DEVTYPE_SAM9G45
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}, { /* sentinel */ }
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};
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MODULE_DEVICE_TABLE(of, atmel_dma_dt_ids);
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#endif
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static struct platform_device_id atdma_devtypes[] = {
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{
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.name = "at91sam9rl_dma",
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@ -1187,6 +1203,19 @@ static struct platform_device_id atdma_devtypes[] = {
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}
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};
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static inline enum atdma_devtype __init at_dma_get_driver_data(
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struct platform_device *pdev)
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{
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if (pdev->dev.of_node) {
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const struct of_device_id *match;
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match = of_match_node(atmel_dma_dt_ids, pdev->dev.of_node);
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if (match == NULL)
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return ATDMA_DEVTYPE_UNDEFINED;
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return (enum atdma_devtype)match->data;
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}
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return platform_get_device_id(pdev)->driver_data;
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}
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/**
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* at_dma_off - disable DMA controller
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* @atdma: the Atmel HDAMC device
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@ -1218,7 +1247,7 @@ static int __init at_dma_probe(struct platform_device *pdev)
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dma_cap_set(DMA_MEMCPY, cap_mask);
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/* get DMA parameters from controller type */
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atdmatype = platform_get_device_id(pdev)->driver_data;
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atdmatype = at_dma_get_driver_data(pdev);
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switch (atdmatype) {
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case ATDMA_DEVTYPE_SAM9RL:
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@ -1526,6 +1555,7 @@ static struct platform_driver at_dma_driver = {
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.driver = {
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.name = "at_hdmac",
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.pm = &at_dma_dev_pm_ops,
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.of_match_table = of_match_ptr(atmel_dma_dt_ids),
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},
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};
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