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linux-next/arch/mips/loongson64/common/dma-swiotlb.c
Christoph Hellwig 452e06af1f dma-mapping: consolidate dma_set_mask
Almost everyone implements dma_set_mask the same way, although some time
that's hidden in ->set_dma_mask methods.

This patch consolidates those into a common implementation that either
calls ->set_dma_mask if present or otherwise uses the default
implementation.  Some architectures used to only call ->set_dma_mask
after the initial checks, and those instance have been fixed to do the
full work.  h8300 implemented dma_set_mask bogusly as a no-ops and has
been fixed.

Unfortunately some architectures overload unrelated semantics like changing
the dma_ops into it so we still need to allow for an architecture override
for now.

[jcmvbkbc@gmail.com: fix xtensa]
Signed-off-by: Christoph Hellwig <hch@lst.de>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Russell King <linux@arm.linux.org.uk>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
Cc: Michal Simek <monstr@monstr.eu>
Cc: Jonas Bonn <jonas@southpole.se>
Cc: Chris Metcalf <cmetcalf@ezchip.com>
Cc: Guan Xuetao <gxt@mprc.pku.edu.cn>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2015-09-10 13:29:01 -07:00

146 lines
3.6 KiB
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, struct dma_attrs *attrs)
{
void *ret;
/* ignore region specifiers */
gfp &= ~(__GFP_DMA | __GFP_DMA32 | __GFP_HIGHMEM);
#ifdef CONFIG_ISA
if (dev == NULL)
gfp |= __GFP_DMA;
else
#endif
#ifdef CONFIG_ZONE_DMA
if (dev->coherent_dma_mask < DMA_BIT_MASK(32))
gfp |= __GFP_DMA;
else
#endif
#ifdef CONFIG_ZONE_DMA32
if (dev->coherent_dma_mask < DMA_BIT_MASK(40))
gfp |= __GFP_DMA32;
else
#endif
;
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, struct dma_attrs *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,
struct dma_attrs *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,
struct dma_attrs *attrs)
{
int r = swiotlb_map_sg_attrs(dev, sg, nents, dir, NULL);
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;
}