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sparc32: remove dma_make_coherent

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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>
This commit is contained in:
Christoph Hellwig 2021-09-13 18:39:38 +02:00
parent 2c38d6a4e9
commit 837e80b3a5
1 changed files with 10 additions and 15 deletions
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25
arch/sparc/kernel/ioport.c
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@ -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