diff options
| author | Christoph Hellwig <hch@lst.de> | 2021-09-13 18:39:38 +0200 |
|---|---|---|
| committer | Christoph Hellwig <hch@lst.de> | 2021-10-21 13:03:04 +0200 |
| commit | 837e80b3a5fc9f5f834e28e108a43ad4dd23dcb7 (patch) | |
| tree | a1beb4c61971ad29f10a17c5e598fd88ddcc70df /arch/sparc | |
| parent | 2c38d6a4e959a88213e24214188e056e5b8cf4c6 (diff) | |
| download | linux-837e80b3a5fc9f5f834e28e108a43ad4dd23dcb7.tar.bz2 | |
sparc32: remove dma_make_coherent
Fold dma_make_coherent into the only remaining caller.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Tested-by: Andreas Larsson <andreas@gaisler.com>
Acked-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'arch/sparc')
| -rw-r--r-- | arch/sparc/kernel/ioport.c | 25 |
1 files changed, 10 insertions, 15 deletions
diff --git a/arch/sparc/kernel/ioport.c b/arch/sparc/kernel/ioport.c index 59375a01c152..3eb748e86222 100644 --- a/arch/sparc/kernel/ioport.c +++ b/arch/sparc/kernel/ioport.c @@ -52,17 +52,6 @@ #include <asm/io-unit.h> #include <asm/leon.h> -/* This function must make sure that caches and memory are coherent after DMA - * On LEON systems without cache snooping it flushes the entire D-CACHE. - */ -static inline void dma_make_coherent(unsigned long pa, unsigned long len) -{ - if (sparc_cpu_model == sparc_leon) { - if (!sparc_leon3_snooping_enabled()) - leon_flush_dcache_all(); - } -} - static void __iomem *_sparc_ioremap(struct resource *res, u32 bus, u32 pa, int sz); static void __iomem *_sparc_alloc_io(unsigned int busno, unsigned long phys, unsigned long size, char *name); @@ -365,13 +354,19 @@ void arch_dma_free(struct device *dev, size_t size, void *cpu_addr, free_pages((unsigned long)phys_to_virt(dma_addr), get_order(size)); } -/* IIep is write-through, not flushing on cpu to device transfer. */ - +/* + * IIep is write-through, not flushing on cpu to device transfer. + * + * On LEON systems without cache snooping, the entire D-CACHE must be flushed to + * make DMA to cacheable memory coherent. + */ void arch_sync_dma_for_cpu(phys_addr_t paddr, size_t size, enum dma_data_direction dir) { - if (dir != PCI_DMA_TODEVICE) - dma_make_coherent(paddr, PAGE_ALIGN(size)); + if (dir != PCI_DMA_TODEVICE && + sparc_cpu_model == sparc_leon && + !sparc_leon3_snooping_enabled()) + leon_flush_dcache_all(); } #ifdef CONFIG_PROC_FS |