Commit ddd4eeca authored by John Crispin's avatar John Crispin Committed by Ralf Baechle
Browse files

MIPS: lantiq: convert dma to platform driver 



Add code to make the dma driver load as a platform device from the devicetree.

Signed-off-by: default avatarJohn Crispin <blogic@openwrt.org>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/3824/


Signed-off-by: default avatarRalf Baechle <ralf@linux-mips.org>
parent 287e3f3f

arch/mips/lantiq/xway/dma.c

+39 −22
Original line number Diff line number Diff line
@@ -19,7 +19,8 @@ 
#include <linux/platform_device.h>

#include <linux/io.h>

#include <linux/dma-mapping.h>

#include <linux/export.h>

#include <linux/module.h>

#include <linux/clk.h>



#include <lantiq_soc.h>

#include <xway_dma.h>
@@ -55,13 +56,6 @@ 
#define ltq_dma_w32_mask(x, y, z)	ltq_w32_mask(x, y, \

						ltq_dma_membase + (z))



static struct resource ltq_dma_resource = {

	.name	= "dma",

	.start	= LTQ_DMA_BASE_ADDR,

	.end	= LTQ_DMA_BASE_ADDR + LTQ_DMA_SIZE - 1,

	.flags  = IORESOURCE_MEM,

};



static void __iomem *ltq_dma_membase;



void
@@ -215,27 +209,28 @@ ltq_dma_init_port(int p) 
}

EXPORT_SYMBOL_GPL(ltq_dma_init_port);



int __init

ltq_dma_init(void)

static int __devinit

ltq_dma_init(struct platform_device *pdev)

{

	struct clk *clk;

	struct resource *res;

	int i;



	/* insert and request the memory region */

	if (insert_resource(&iomem_resource, &ltq_dma_resource) < 0)

		panic("Failed to insert dma memory");



	if (request_mem_region(ltq_dma_resource.start,

			resource_size(&ltq_dma_resource), "dma") < 0)

		panic("Failed to request dma memory");

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);

	if (!res)

		panic("Failed to get dma resource");



	/* remap dma register range */

	ltq_dma_membase = ioremap_nocache(ltq_dma_resource.start,

				resource_size(&ltq_dma_resource));

	ltq_dma_membase = devm_request_and_ioremap(&pdev->dev, res);

	if (!ltq_dma_membase)

		panic("Failed to remap dma memory");

		panic("Failed to remap dma resource");



	/* power up and reset the dma engine */

	ltq_pmu_enable(PMU_DMA);

	clk = clk_get(&pdev->dev, NULL);

	if (IS_ERR(clk))

		panic("Failed to get dma clock");



	clk_enable(clk);

	ltq_dma_w32_mask(0, DMA_RESET, LTQ_DMA_CTRL);



	/* disable all interrupts */
@@ -248,7 +243,29 @@ ltq_dma_init(void) 
		ltq_dma_w32(DMA_POLL | DMA_CLK_DIV4, LTQ_DMA_CPOLL);

		ltq_dma_w32_mask(DMA_CHAN_ON, 0, LTQ_DMA_CCTRL);

	}

	dev_info(&pdev->dev, "init done\n");

	return 0;

}



postcore_initcall(ltq_dma_init);
 
static const struct of_device_id dma_match[] = {

	{ .compatible = "lantiq,dma-xway" },

	{},

};

MODULE_DEVICE_TABLE(of, dma_match);



static struct platform_driver dma_driver = {

	.probe = ltq_dma_init,

	.driver = {

		.name = "dma-xway",

		.owner = THIS_MODULE,

		.of_match_table = dma_match,

	},

};



int __init

dma_init(void)

{

	return platform_driver_register(&dma_driver);

}



postcore_initcall(dma_init);