[mirror_ubuntu-artful-kernel.git] / arch / mips / loongson64 / common / dma-swiotlb.c

#include <linux/mm.h>
#include <linux/init.h>
#include <linux/dma-mapping.h>
#include <linux/scatterlist.h>
#include <linux/swiotlb.h>
#include <linux/bootmem.h>

#include <asm/bootinfo.h>
#include <boot_param.h>
#include <dma-coherence.h>

static void *loongson_dma_alloc_coherent(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_DMA32 | __GFP_HIGHMEM);

	if ((IS_ENABLED(CONFIG_ISA) && dev == NULL) ||
	    (IS_ENABLED(CONFIG_ZONE_DMA) &&
	     dev->coherent_dma_mask < DMA_BIT_MASK(32)))
		gfp |= __GFP_DMA;
	else if (IS_ENABLED(CONFIG_ZONE_DMA32) &&
		 dev->coherent_dma_mask < DMA_BIT_MASK(40))
		gfp |= __GFP_DMA32;

	gfp |= __GFP_NORETRY;

	ret = swiotlb_alloc_coherent(dev, size, dma_handle, gfp);
	mb();
	return ret;
}

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

static dma_addr_t loongson_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 daddr = swiotlb_map_page(dev, page, offset, size,
					dir, attrs);
	mb();
	return daddr;
}

static int loongson_dma_map_sg(struct device *dev, struct scatterlist *sg,
				int nents, enum dma_data_direction dir,
				unsigned long attrs)
{
	int r = swiotlb_map_sg_attrs(dev, sg, nents, dir, attrs);
	mb();

	return r;
}

static void loongson_dma_sync_single_for_device(struct device *dev,
				dma_addr_t dma_handle, size_t size,
				enum dma_data_direction dir)
{
	swiotlb_sync_single_for_device(dev, dma_handle, size, dir);
	mb();
}

static void loongson_dma_sync_sg_for_device(struct device *dev,
				struct scatterlist *sg, int nents,
				enum dma_data_direction dir)
{
	swiotlb_sync_sg_for_device(dev, sg, nents, dir);
	mb();
}

static int loongson_dma_set_mask(struct device *dev, u64 mask)
{
	if (!dev->dma_mask || !dma_supported(dev, mask))
		return -EIO;

	if (mask > DMA_BIT_MASK(loongson_sysconf.dma_mask_bits)) {
		*dev->dma_mask = DMA_BIT_MASK(loongson_sysconf.dma_mask_bits);
		return -EIO;
	}

	*dev->dma_mask = mask;

	return 0;
}

dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
{
	long nid;
#ifdef CONFIG_PHYS48_TO_HT40
	/* We extract 2bit node id (bit 44~47, only bit 44~45 used now) from
	 * Loongson-3's 48bit address space and embed it into 40bit */
	nid = (paddr >> 44) & 0x3;
	paddr = ((nid << 44) ^ paddr) | (nid << 37);
#endif
	return paddr;
}

phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr)
{
	long nid;
#ifdef CONFIG_PHYS48_TO_HT40
	/* We extract 2bit node id (bit 44~47, only bit 44~45 used now) from
	 * Loongson-3's 48bit address space and embed it into 40bit */
	nid = (daddr >> 37) & 0x3;
	daddr = ((nid << 37) ^ daddr) | (nid << 44);
#endif
	return daddr;
}

static struct dma_map_ops loongson_dma_map_ops = {
	.alloc = loongson_dma_alloc_coherent,
	.free = loongson_dma_free_coherent,
	.map_page = loongson_dma_map_page,
	.unmap_page = swiotlb_unmap_page,
	.map_sg = loongson_dma_map_sg,
	.unmap_sg = swiotlb_unmap_sg_attrs,
	.sync_single_for_cpu = swiotlb_sync_single_for_cpu,
	.sync_single_for_device = loongson_dma_sync_single_for_device,
	.sync_sg_for_cpu = swiotlb_sync_sg_for_cpu,
	.sync_sg_for_device = loongson_dma_sync_sg_for_device,
	.mapping_error = swiotlb_dma_mapping_error,
	.dma_supported = swiotlb_dma_supported,
	.set_dma_mask = loongson_dma_set_mask
};

void __init plat_swiotlb_setup(void)
{
	swiotlb_init(1);
	mips_dma_map_ops = &loongson_dma_map_ops;
}
Commit	Line	Data
1299b0e0 HC	1	#include <linux/mm.h>
	2	#include <linux/init.h>
	3	#include <linux/dma-mapping.h>
	4	#include <linux/scatterlist.h>
	5	#include <linux/swiotlb.h>
	6	#include <linux/bootmem.h>
	7
	8	#include <asm/bootinfo.h>
	9	#include <boot_param.h>
	10	#include <dma-coherence.h>
	11
	12	static void loongson_dma_alloc_coherent(struct device dev, size_t size,
00085f1e	13	dma_addr_t *dma_handle, gfp_t gfp, unsigned long attrs)
1299b0e0 HC	14	{
	15	void *ret;
	16
1299b0e0 HC	17	/* ignore region specifiers */
	18	gfp &= ~(__GFP_DMA \| __GFP_DMA32 \| __GFP_HIGHMEM);
	19
72d1cfc9 AB	20	if ((IS_ENABLED(CONFIG_ISA) && dev == NULL) \|\|
	21	(IS_ENABLED(CONFIG_ZONE_DMA) &&
	22	dev->coherent_dma_mask < DMA_BIT_MASK(32)))
1299b0e0	23	gfp \|= __GFP_DMA;
72d1cfc9 AB	24	else if (IS_ENABLED(CONFIG_ZONE_DMA32) &&
72d1cfc9 AB	25	dev->coherent_dma_mask < DMA_BIT_MASK(40))
1299b0e0	26	gfp \|= __GFP_DMA32;
72d1cfc9	27
1299b0e0 HC	28	gfp \|= __GFP_NORETRY;
	29
	30	ret = swiotlb_alloc_coherent(dev, size, dma_handle, gfp);
	31	mb();
	32	return ret;
	33	}
	34
	35	static void loongson_dma_free_coherent(struct device *dev, size_t size,
00085f1e	36	void *vaddr, dma_addr_t dma_handle, unsigned long attrs)
1299b0e0	37	{
1299b0e0 HC	38	swiotlb_free_coherent(dev, size, vaddr, dma_handle);
	39	}
	40
	41	static dma_addr_t loongson_dma_map_page(struct device dev, struct page page,
	42	unsigned long offset, size_t size,
	43	enum dma_data_direction dir,
00085f1e	44	unsigned long attrs)
1299b0e0 HC	45	{
	46	dma_addr_t daddr = swiotlb_map_page(dev, page, offset, size,
	47	dir, attrs);
	48	mb();
	49	return daddr;
	50	}
	51
	52	static int loongson_dma_map_sg(struct device dev, struct scatterlist sg,
	53	int nents, enum dma_data_direction dir,
00085f1e	54	unsigned long attrs)
1299b0e0	55	{
9f318d47	56	int r = swiotlb_map_sg_attrs(dev, sg, nents, dir, attrs);
1299b0e0 HC	57	mb();
	58
	59	return r;
	60	}
	61
	62	static void loongson_dma_sync_single_for_device(struct device *dev,
	63	dma_addr_t dma_handle, size_t size,
	64	enum dma_data_direction dir)
	65	{
	66	swiotlb_sync_single_for_device(dev, dma_handle, size, dir);
	67	mb();
	68	}
	69
	70	static void loongson_dma_sync_sg_for_device(struct device *dev,
	71	struct scatterlist *sg, int nents,
	72	enum dma_data_direction dir)
	73	{
	74	swiotlb_sync_sg_for_device(dev, sg, nents, dir);
	75	mb();
	76	}
	77
	78	static int loongson_dma_set_mask(struct device *dev, u64 mask)
	79	{
452e06af CH	80	if (!dev->dma_mask \|\| !dma_supported(dev, mask))
	81	return -EIO;
	82
1299b0e0 HC	83	if (mask > DMA_BIT_MASK(loongson_sysconf.dma_mask_bits)) {
	84	*dev->dma_mask = DMA_BIT_MASK(loongson_sysconf.dma_mask_bits);
	85	return -EIO;
	86	}
	87
	88	*dev->dma_mask = mask;
	89
	90	return 0;
	91	}
	92
	93	dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
	94	{
f490682a HC	95	long nid;
	96	#ifdef CONFIG_PHYS48_TO_HT40
	97	/* We extract 2bit node id (bit 44~47, only bit 44~45 used now) from
	98	* Loongson-3's 48bit address space and embed it into 40bit */
	99	nid = (paddr >> 44) & 0x3;
	100	paddr = ((nid << 44) ^ paddr) \| (nid << 37);
	101	#endif
1299b0e0 HC	102	return paddr;
	103	}
	104
	105	phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr)
	106	{
f490682a HC	107	long nid;
	108	#ifdef CONFIG_PHYS48_TO_HT40
	109	/* We extract 2bit node id (bit 44~47, only bit 44~45 used now) from
	110	* Loongson-3's 48bit address space and embed it into 40bit */
	111	nid = (daddr >> 37) & 0x3;
	112	daddr = ((nid << 37) ^ daddr) \| (nid << 44);
	113	#endif
1299b0e0 HC	114	return daddr;
	115	}
	116
	117	static struct dma_map_ops loongson_dma_map_ops = {
	118	.alloc = loongson_dma_alloc_coherent,
	119	.free = loongson_dma_free_coherent,
	120	.map_page = loongson_dma_map_page,
	121	.unmap_page = swiotlb_unmap_page,
	122	.map_sg = loongson_dma_map_sg,
	123	.unmap_sg = swiotlb_unmap_sg_attrs,
	124	.sync_single_for_cpu = swiotlb_sync_single_for_cpu,
	125	.sync_single_for_device = loongson_dma_sync_single_for_device,
	126	.sync_sg_for_cpu = swiotlb_sync_sg_for_cpu,
	127	.sync_sg_for_device = loongson_dma_sync_sg_for_device,
	128	.mapping_error = swiotlb_dma_mapping_error,
	129	.dma_supported = swiotlb_dma_supported,
	130	.set_dma_mask = loongson_dma_set_mask
	131	};
	132
	133	void __init plat_swiotlb_setup(void)
	134	{
	135	swiotlb_init(1);
	136	mips_dma_map_ops = &loongson_dma_map_ops;
	137	}