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authorChristoph Hellwig <hch@lst.de>2021-02-10 12:56:37 +0300
committerThomas Bogendoerfer <tsbogend@alpha.franken.de>2021-02-13 11:51:45 +0300
commit3440caf5f28c4e4a585dd5a7cead1b7c414973da (patch)
tree706e3fd7cf657bca6e64d9095f75dd23d1ae09f9 /arch/mips/alchemy/common
parent04e4783fccf4268249bff2c1be9f63013d12153a (diff)
downloadlinux-3440caf5f28c4e4a585dd5a7cead1b7c414973da.tar.xz
MIPS/alchemy: factor out the DMA coherent setup
Factor out a alchemy_dma_coherent helper that determines if the platform is DMA coherent. Also stop initializing the hw_coherentio variable, given that is only ever set to a non-zero value by the malta setup code. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Diffstat (limited to 'arch/mips/alchemy/common')
-rw-r--r--arch/mips/alchemy/common/setup.c33
1 files changed, 19 insertions, 14 deletions
diff --git a/arch/mips/alchemy/common/setup.c b/arch/mips/alchemy/common/setup.c
index 0f60efe0481e..c2da68e79844 100644
--- a/arch/mips/alchemy/common/setup.c
+++ b/arch/mips/alchemy/common/setup.c
@@ -37,6 +37,23 @@
extern void __init board_setup(void);
extern void __init alchemy_set_lpj(void);
+static bool alchemy_dma_coherent(void)
+{
+ switch (alchemy_get_cputype()) {
+ case ALCHEMY_CPU_AU1000:
+ case ALCHEMY_CPU_AU1500:
+ case ALCHEMY_CPU_AU1100:
+ return false;
+ case ALCHEMY_CPU_AU1200:
+ /* Au1200 AB USB does not support coherent memory */
+ if ((read_c0_prid() & PRID_REV_MASK) == 0)
+ return false;
+ return true;
+ default:
+ return true;
+ }
+}
+
void __init plat_mem_setup(void)
{
alchemy_set_lpj();
@@ -48,20 +65,8 @@ void __init plat_mem_setup(void)
/* Clear to obtain best system bus performance */
clear_c0_config(1 << 19); /* Clear Config[OD] */
- hw_coherentio = 0;
- coherentio = IO_COHERENCE_ENABLED;
- switch (alchemy_get_cputype()) {
- case ALCHEMY_CPU_AU1000:
- case ALCHEMY_CPU_AU1500:
- case ALCHEMY_CPU_AU1100:
- coherentio = IO_COHERENCE_DISABLED;
- break;
- case ALCHEMY_CPU_AU1200:
- /* Au1200 AB USB does not support coherent memory */
- if (0 == (read_c0_prid() & PRID_REV_MASK))
- coherentio = IO_COHERENCE_DISABLED;
- break;
- }
+ coherentio = alchemy_dma_coherent() ?
+ IO_COHERENCE_ENABLED : IO_COHERENCE_DISABLED;
board_setup(); /* board specific setup */