hexagon: use generic dma_noncoherent_ops

config HEXAGON

	def_bool y

	select ARCH_HAS_SYNC_DMA_FOR_DEVICE

	select ARCH_NO_PREEMPT

	select HAVE_OPROFILE

	# Other pending projects/to-do items.

	select GENERIC_CLOCKEVENTS_BROADCAST

	select MODULES_USE_ELF_RELA

	select GENERIC_CPU_DEVICES

	select DMA_NONCOHERENT_OPS

	---help---

	  Qualcomm Hexagon is a processor architecture designed for high

	  performance and low power across a wide variety of applications.

generic-y += current.h

generic-y += device.h

generic-y += div64.h

generic-y += dma-mapping.h

generic-y += emergency-restart.h

generic-y += extable.h

generic-y += fb.h

/*

 * DMA operations for the Hexagon architecture

 *

 * Copyright (c) 2010-2011, The Linux Foundation. All rights reserved.

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 and

 * only version 2 as published by the Free Software Foundation.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA

 * 02110-1301, USA.

 */

#ifndef _ASM_DMA_MAPPING_H

#define _ASM_DMA_MAPPING_H

#include <linux/types.h>

#include <linux/cache.h>

#include <linux/mm.h>

#include <linux/scatterlist.h>

#include <linux/dma-debug.h>

#include <asm/io.h>

struct device;

extern const struct dma_map_ops *dma_ops;

static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)

{

	return dma_ops;

}

#endif

 * 02110-1301, USA.

 */

#include <linux/dma-mapping.h>

#include <linux/dma-direct.h>

#include <linux/dma-noncoherent.h>

#include <linux/bootmem.h>

#include <linux/genalloc.h>

#include <asm/dma-mapping.h>

#include <linux/module.h>

#include <asm/page.h>

#define HEXAGON_MAPPING_ERROR	0

const struct dma_map_ops *dma_ops;

EXPORT_SYMBOL(dma_ops);

static inline void *dma_addr_to_virt(dma_addr_t dma_addr)

{

	return phys_to_virt((unsigned long) dma_addr);

}

static struct gen_pool *coherent_pool;

/* Allocates from a pool of uncached memory that was reserved at boot time */

static void *hexagon_dma_alloc_coherent(struct device *dev, size_t size,

				 dma_addr_t *dma_addr, gfp_t flag,

				 unsigned long attrs)

void *arch_dma_alloc(struct device *dev, size_t size, dma_addr_t *dma_addr,

		gfp_t flag, unsigned long attrs)

{

	void *ret;

	return ret;

}

static void hexagon_free_coherent(struct device *dev, size_t size, void *vaddr,

void arch_dma_free(struct device *dev, size_t size, void *vaddr,

		dma_addr_t dma_addr, unsigned long attrs)

{

	gen_pool_free(coherent_pool, (unsigned long) vaddr, size);

}

static int check_addr(const char *name, struct device *hwdev,

		      dma_addr_t bus, size_t size)

{

	if (hwdev && hwdev->dma_mask && !dma_capable(hwdev, bus, size)) {

		if (*hwdev->dma_mask >= DMA_BIT_MASK(32))

			printk(KERN_ERR

				"%s: overflow %Lx+%zu of device mask %Lx\n",

				name, (long long)bus, size,

				(long long)*hwdev->dma_mask);

		return 0;

	}

	return 1;

}

static int hexagon_map_sg(struct device *hwdev, struct scatterlist *sg,

			  int nents, enum dma_data_direction dir,

			  unsigned long attrs)

void arch_sync_dma_for_device(struct device *dev, phys_addr_t paddr,

		size_t size, enum dma_data_direction dir)

{

	struct scatterlist *s;

	int i;

	WARN_ON(nents == 0 || sg[0].length == 0);

	for_each_sg(sg, s, nents, i) {

		s->dma_address = sg_phys(s);

		if (!check_addr("map_sg", hwdev, s->dma_address, s->length))

			return 0;

		s->dma_length = s->length;

	void *addr = phys_to_virt(paddr);

		if (attrs & DMA_ATTR_SKIP_CPU_SYNC)

			continue;

		flush_dcache_range(dma_addr_to_virt(s->dma_address),

				   dma_addr_to_virt(s->dma_address + s->length));

	}

	return nents;

}

/*

 * address is virtual

 */

static inline void dma_sync(void *addr, size_t size,

			    enum dma_data_direction dir)

{

	switch (dir) {

	case DMA_TO_DEVICE:

		hexagon_clean_dcache_range((unsigned long) addr,

		BUG();

	}

}

/**

 * hexagon_map_page() - maps an address for device DMA

 * @dev:	pointer to DMA device

 * @page:	pointer to page struct of DMA memory

 * @offset:	offset within page

 * @size:	size of memory to map

 * @dir:	transfer direction

 * @attrs:	pointer to DMA attrs (not used)

 *

 * Called to map a memory address to a DMA address prior

 * to accesses to/from device.

 *

 * We don't particularly have many hoops to jump through

 * so far.  Straight translation between phys and virtual.

 *

 * DMA is not cache coherent so sync is necessary; this

 * seems to be a convenient place to do it.

 *

 */

static dma_addr_t hexagon_map_page(struct device *dev, struct page *page,

				   unsigned long offset, size_t size,

				   enum dma_data_direction dir,

				   unsigned long attrs)

{

	dma_addr_t bus = page_to_phys(page) + offset;

	WARN_ON(size == 0);

	if (!check_addr("map_single", dev, bus, size))

		return HEXAGON_MAPPING_ERROR;

	if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC))

		dma_sync(dma_addr_to_virt(bus), size, dir);

	return bus;

}

static void hexagon_sync_single_for_device(struct device *dev,

					dma_addr_t dma_handle, size_t size,

					enum dma_data_direction dir)

{

	dma_sync(dma_addr_to_virt(dma_handle), size, dir);

}

static void hexagon_sync_sg_for_device(struct device *dev,

		struct scatterlist *sgl, int nents, enum dma_data_direction dir)

{

	struct scatterlist *sg;

	int i;

	for_each_sg(sgl, sg, nents, i)

		hexagon_sync_single_for_device(dev, sg_dma_address(sg),

				sg->length, dir);

}

static int hexagon_mapping_error(struct device *dev, dma_addr_t dma_addr)

{

	return dma_addr == HEXAGON_MAPPING_ERROR;

}

const struct dma_map_ops hexagon_dma_ops = {

	.alloc		= hexagon_dma_alloc_coherent,

	.free		= hexagon_free_coherent,

	.map_sg		= hexagon_map_sg,

	.map_page	= hexagon_map_page,

	.sync_single_for_device = hexagon_sync_single_for_device,

	.sync_sg_for_device = hexagon_sync_sg_for_device,

	.mapping_error	= hexagon_mapping_error,

};

void __init hexagon_dma_init(void)

{

	if (dma_ops)

		return;

	dma_ops = &hexagon_dma_ops;

}