linux-vybrid_public/arch/arm/plat-s5p/dev-mfc.c

/* linux/arch/arm/plat-s5p/dev-mfc.c
 *
 * Copyright (C) 2010-2011 Samsung Electronics Co.Ltd
 *
 * Base S5P MFC resource and device definitions
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */


#include <linux/kernel.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>
#include <linux/dma-mapping.h>
#include <linux/memblock.h>
#include <linux/ioport.h>

#include <mach/map.h>
#include <plat/devs.h>
#include <plat/irqs.h>
#include <plat/mfc.h>

static struct resource s5p_mfc_resource[] = {
	[0] = {
		.start	= S5P_PA_MFC,
		.end	= S5P_PA_MFC + SZ_64K - 1,
		.flags	= IORESOURCE_MEM,
	},
	[1] = {
		.start	= IRQ_MFC,
		.end	= IRQ_MFC,
		.flags	= IORESOURCE_IRQ,
	}
};

struct platform_device s5p_device_mfc = {
	.name		= "s5p-mfc",
	.id		= -1,
	.num_resources	= ARRAY_SIZE(s5p_mfc_resource),
	.resource	= s5p_mfc_resource,
};

/*
 * MFC hardware has 2 memory interfaces which are modelled as two separate
 * platform devices to let dma-mapping distinguish between them.
 *
 * MFC parent device (s5p_device_mfc) must be registered before memory
 * interface specific devices (s5p_device_mfc_l and s5p_device_mfc_r).
 */

static u64 s5p_mfc_dma_mask = DMA_BIT_MASK(32);

struct platform_device s5p_device_mfc_l = {
	.name		= "s5p-mfc-l",
	.id		= -1,
	.dev		= {
		.parent			= &s5p_device_mfc.dev,
		.dma_mask		= &s5p_mfc_dma_mask,
		.coherent_dma_mask	= DMA_BIT_MASK(32),
	},
};

struct platform_device s5p_device_mfc_r = {
	.name		= "s5p-mfc-r",
	.id		= -1,
	.dev		= {
		.parent			= &s5p_device_mfc.dev,
		.dma_mask		= &s5p_mfc_dma_mask,
		.coherent_dma_mask	= DMA_BIT_MASK(32),
	},
};

struct s5p_mfc_reserved_mem {
	phys_addr_t	base;
	unsigned long	size;
	struct device	*dev;
};

static struct s5p_mfc_reserved_mem s5p_mfc_mem[2] __initdata;

void __init s5p_mfc_reserve_mem(phys_addr_t rbase, unsigned int rsize,
				phys_addr_t lbase, unsigned int lsize)
{
	int i;

	s5p_mfc_mem[0].dev = &s5p_device_mfc_r.dev;
	s5p_mfc_mem[0].base = rbase;
	s5p_mfc_mem[0].size = rsize;

	s5p_mfc_mem[1].dev = &s5p_device_mfc_l.dev;
	s5p_mfc_mem[1].base = lbase;
	s5p_mfc_mem[1].size = lsize;

	for (i = 0; i < ARRAY_SIZE(s5p_mfc_mem); i++) {
		struct s5p_mfc_reserved_mem *area = &s5p_mfc_mem[i];
		if (memblock_remove(area->base, area->size)) {
			printk(KERN_ERR "Failed to reserve memory for MFC device (%ld bytes at 0x%08lx)\n",
			       area->size, (unsigned long) area->base);
			area->base = 0;
		}
	}
}

static int __init s5p_mfc_memory_init(void)
{
	int i;

	for (i = 0; i < ARRAY_SIZE(s5p_mfc_mem); i++) {
		struct s5p_mfc_reserved_mem *area = &s5p_mfc_mem[i];
		if (!area->base)
			continue;

		if (dma_declare_coherent_memory(area->dev, area->base,
				area->base, area->size,
				DMA_MEMORY_MAP | DMA_MEMORY_EXCLUSIVE) == 0)
			printk(KERN_ERR "Failed to declare coherent memory for MFC device (%ld bytes at 0x%08lx)\n",
			       area->size, (unsigned long) area->base);
	}
	return 0;
}
device_initcall(s5p_mfc_memory_init);