[mirror_ubuntu-artful-kernel.git] / arch / m68k / kernel / dma.c

/*
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file COPYING in the main directory of this archive
 * for more details.
 */

#undef DEBUG

#include <linux/dma-mapping.h>
#include <linux/device.h>
#include <linux/kernel.h>
#include <linux/scatterlist.h>
#include <linux/slab.h>
#include <linux/vmalloc.h>
#include <linux/export.h>

#include <asm/pgalloc.h>

#if defined(CONFIG_MMU) && !defined(CONFIG_COLDFIRE)

static void *m68k_dma_alloc(struct device *dev, size_t size, dma_addr_t *handle,
		gfp_t flag, unsigned long attrs)
{
	struct page *page, **map;
	pgprot_t pgprot;
	void *addr;
	int i, order;

	pr_debug("dma_alloc_coherent: %d,%x\n", size, flag);

	size = PAGE_ALIGN(size);
	order = get_order(size);

	page = alloc_pages(flag, order);
	if (!page)
		return NULL;

	*handle = page_to_phys(page);
	map = kmalloc(sizeof(struct page *) << order, flag & ~__GFP_DMA);
	if (!map) {
		__free_pages(page, order);
		return NULL;
	}
	split_page(page, order);

	order = 1 << order;
	size >>= PAGE_SHIFT;
	map[0] = page;
	for (i = 1; i < size; i++)
		map[i] = page + i;
	for (; i < order; i++)
		__free_page(page + i);
	pgprot = __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED | _PAGE_DIRTY);
	if (CPU_IS_040_OR_060)
		pgprot_val(pgprot) |= _PAGE_GLOBAL040 | _PAGE_NOCACHE_S;
	else
		pgprot_val(pgprot) |= _PAGE_NOCACHE030;
	addr = vmap(map, size, VM_MAP, pgprot);
	kfree(map);

	return addr;
}

static void m68k_dma_free(struct device *dev, size_t size, void *addr,
		dma_addr_t handle, unsigned long attrs)
{
	pr_debug("dma_free_coherent: %p, %x\n", addr, handle);
	vfree(addr);
}

#else

#include <asm/cacheflush.h>

static void *m68k_dma_alloc(struct device *dev, size_t size,
		dma_addr_t *dma_handle, gfp_t gfp, unsigned long attrs)
{
	void *ret;
	/* ignore region specifiers */
	gfp &= ~(__GFP_DMA | __GFP_HIGHMEM);

	if (dev == NULL || (*dev->dma_mask < 0xffffffff))
		gfp |= GFP_DMA;
	ret = (void *)__get_free_pages(gfp, get_order(size));

	if (ret != NULL) {
		memset(ret, 0, size);
		*dma_handle = virt_to_phys(ret);
	}
	return ret;
}

static void m68k_dma_free(struct device *dev, size_t size, void *vaddr,
		dma_addr_t dma_handle, unsigned long attrs)
{
	free_pages((unsigned long)vaddr, get_order(size));
}

#endif /* CONFIG_MMU && !CONFIG_COLDFIRE */

static void m68k_dma_sync_single_for_device(struct device *dev,
		dma_addr_t handle, size_t size, enum dma_data_direction dir)
{
	switch (dir) {
	case DMA_BIDIRECTIONAL:
	case DMA_TO_DEVICE:
		cache_push(handle, size);
		break;
	case DMA_FROM_DEVICE:
		cache_clear(handle, size);
		break;
	default:
		if (printk_ratelimit())
			printk("dma_sync_single_for_device: unsupported dir %u\n", dir);
		break;
	}
}

static void m68k_dma_sync_sg_for_device(struct device *dev,
		struct scatterlist *sglist, int nents, enum dma_data_direction dir)
{
	int i;
	struct scatterlist *sg;

	for_each_sg(sglist, sg, nents, i) {
		dma_sync_single_for_device(dev, sg->dma_address, sg->length,
					   dir);
	}
}

static dma_addr_t m68k_dma_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 handle = page_to_phys(page) + offset;

	if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC))
		dma_sync_single_for_device(dev, handle, size, dir);

	return handle;
}

static int m68k_dma_map_sg(struct device *dev, struct scatterlist *sglist,
		int nents, enum dma_data_direction dir, unsigned long attrs)
{
	int i;
	struct scatterlist *sg;

	for_each_sg(sglist, sg, nents, i) {
		sg->dma_address = sg_phys(sg);

		if (attrs & DMA_ATTR_SKIP_CPU_SYNC)
			continue;

		dma_sync_single_for_device(dev, sg->dma_address, sg->length,
					   dir);
	}
	return nents;
}

struct dma_map_ops m68k_dma_ops = {
	.alloc			= m68k_dma_alloc,
	.free			= m68k_dma_free,
	.map_page		= m68k_dma_map_page,
	.map_sg			= m68k_dma_map_sg,
	.sync_single_for_device	= m68k_dma_sync_single_for_device,
	.sync_sg_for_device	= m68k_dma_sync_sg_for_device,
};
EXPORT_SYMBOL(m68k_dma_ops);
Commit	Line	Data
5641686c GU	1	/*
	2	* This file is subject to the terms and conditions of the GNU General Public
	3	* License. See the file COPYING in the main directory of this archive
	4	* for more details.
	5	*/
	6
	7	#undef DEBUG
	8
	9	#include <linux/dma-mapping.h>
	10	#include <linux/device.h>
	11	#include <linux/kernel.h>
	12	#include <linux/scatterlist.h>
	13	#include <linux/slab.h>
	14	#include <linux/vmalloc.h>
	15	#include <linux/export.h>
	16
	17	#include <asm/pgalloc.h>
	18
b60f187f	19	#if defined(CONFIG_MMU) && !defined(CONFIG_COLDFIRE)
5641686c	20
340f3039	21	static void m68k_dma_alloc(struct device dev, size_t size, dma_addr_t *handle,
00085f1e	22	gfp_t flag, unsigned long attrs)
5641686c GU	23	{
	24	struct page page, *map;
	25	pgprot_t pgprot;
	26	void *addr;
	27	int i, order;
	28
	29	pr_debug("dma_alloc_coherent: %d,%x\n", size, flag);
	30
	31	size = PAGE_ALIGN(size);
	32	order = get_order(size);
	33
	34	page = alloc_pages(flag, order);
	35	if (!page)
	36	return NULL;
	37
	38	*handle = page_to_phys(page);
	39	map = kmalloc(sizeof(struct page *) << order, flag & ~__GFP_DMA);
	40	if (!map) {
	41	__free_pages(page, order);
	42	return NULL;
	43	}
	44	split_page(page, order);
	45
	46	order = 1 << order;
	47	size >>= PAGE_SHIFT;
	48	map[0] = page;
	49	for (i = 1; i < size; i++)
	50	map[i] = page + i;
	51	for (; i < order; i++)
	52	__free_page(page + i);
	53	pgprot = __pgprot(_PAGE_PRESENT \| _PAGE_ACCESSED \| _PAGE_DIRTY);
	54	if (CPU_IS_040_OR_060)
	55	pgprot_val(pgprot) \|= _PAGE_GLOBAL040 \| _PAGE_NOCACHE_S;
	56	else
	57	pgprot_val(pgprot) \|= _PAGE_NOCACHE030;
	58	addr = vmap(map, size, VM_MAP, pgprot);
	59	kfree(map);
	60
	61	return addr;
	62	}
	63
340f3039	64	static void m68k_dma_free(struct device dev, size_t size, void addr,
00085f1e	65	dma_addr_t handle, unsigned long attrs)
5641686c GU	66	{
	67	pr_debug("dma_free_coherent: %p, %x\n", addr, handle);
	68	vfree(addr);
	69	}
	70
66d857b0	71	#else
5641686c GU	72
	73	#include <asm/cacheflush.h>
	74
340f3039	75	static void m68k_dma_alloc(struct device dev, size_t size,
00085f1e	76	dma_addr_t *dma_handle, gfp_t gfp, unsigned long attrs)
5641686c GU	77	{
	78	void *ret;
	79	/* ignore region specifiers */
	80	gfp &= ~(__GFP_DMA \| __GFP_HIGHMEM);
	81
	82	if (dev == NULL \|\| (*dev->dma_mask < 0xffffffff))
	83	gfp \|= GFP_DMA;
	84	ret = (void *)__get_free_pages(gfp, get_order(size));
	85
	86	if (ret != NULL) {
	87	memset(ret, 0, size);
	88	*dma_handle = virt_to_phys(ret);
	89	}
	90	return ret;
	91	}
	92
340f3039	93	static void m68k_dma_free(struct device dev, size_t size, void vaddr,
00085f1e	94	dma_addr_t dma_handle, unsigned long attrs)
5641686c GU	95	{
	96	free_pages((unsigned long)vaddr, get_order(size));
	97	}
	98
b60f187f	99	#endif /* CONFIG_MMU && !CONFIG_COLDFIRE */
5641686c	100
340f3039 CH	101	static void m68k_dma_sync_single_for_device(struct device *dev,
340f3039 CH	102	dma_addr_t handle, size_t size, enum dma_data_direction dir)
5641686c GU	103	{
5641686c GU	104	switch (dir) {
d2661c62	105	case DMA_BIDIRECTIONAL:
5641686c GU	106	case DMA_TO_DEVICE:
	107	cache_push(handle, size);
	108	break;
	109	case DMA_FROM_DEVICE:
	110	cache_clear(handle, size);
	111	break;
	112	default:
	113	if (printk_ratelimit())
	114	printk("dma_sync_single_for_device: unsupported dir %u\n", dir);
	115	break;
	116	}
	117	}
5641686c	118
340f3039 CH	119	static void m68k_dma_sync_sg_for_device(struct device *dev,
340f3039 CH	120	struct scatterlist *sglist, int nents, enum dma_data_direction dir)
5641686c GU	121	{
5641686c GU	122	int i;
1214c525	123	struct scatterlist *sg;
5641686c	124
1214c525 AM	125	for_each_sg(sglist, sg, nents, i) {
	126	dma_sync_single_for_device(dev, sg->dma_address, sg->length,
	127	dir);
	128	}
5641686c	129	}
5641686c	130
340f3039 CH	131	static dma_addr_t m68k_dma_map_page(struct device dev, struct page page,
340f3039 CH	132	unsigned long offset, size_t size, enum dma_data_direction dir,
00085f1e	133	unsigned long attrs)
5641686c GU	134	{
	135	dma_addr_t handle = page_to_phys(page) + offset;
	136
5140d234 AD	137	if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC))
	138	dma_sync_single_for_device(dev, handle, size, dir);
	139
5641686c GU	140	return handle;
5641686c GU	141	}
5641686c	142
340f3039	143	static int m68k_dma_map_sg(struct device dev, struct scatterlist sglist,
00085f1e	144	int nents, enum dma_data_direction dir, unsigned long attrs)
5641686c GU	145	{
5641686c GU	146	int i;
1214c525	147	struct scatterlist *sg;
5641686c	148
1214c525	149	for_each_sg(sglist, sg, nents, i) {
5641686c	150	sg->dma_address = sg_phys(sg);
5140d234 AD	151
	152	if (attrs & DMA_ATTR_SKIP_CPU_SYNC)
	153	continue;
	154
1214c525 AM	155	dma_sync_single_for_device(dev, sg->dma_address, sg->length,
1214c525 AM	156	dir);
5641686c GU	157	}
	158	return nents;
	159	}
340f3039 CH	160
	161	struct dma_map_ops m68k_dma_ops = {
	162	.alloc = m68k_dma_alloc,
	163	.free = m68k_dma_free,
	164	.map_page = m68k_dma_map_page,
	165	.map_sg = m68k_dma_map_sg,
	166	.sync_single_for_device = m68k_dma_sync_single_for_device,
	167	.sync_sg_for_device = m68k_dma_sync_sg_for_device,
	168	};
	169	EXPORT_SYMBOL(m68k_dma_ops);