From 837e80b3a5fc9f5f834e28e108a43ad4dd23dcb7 Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Mon, 13 Sep 2021 18:39:38 +0200 Subject: sparc32: remove dma_make_coherent Fold dma_make_coherent into the only remaining caller. Signed-off-by: Christoph Hellwig Tested-by: Andreas Larsson Acked-by: David S. Miller --- arch/sparc/kernel/ioport.c | 25 ++++++++++--------------- 1 file changed, 10 insertions(+), 15 deletions(-) (limited to 'arch/sparc/kernel/ioport.c') 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 #include -/* 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 -- cgit v1.2.3