diff options
| author | Christoph Hellwig <hch@lst.de> | 2021-02-10 12:56:37 +0300 |
|---|---|---|
| committer | Thomas Bogendoerfer <tsbogend@alpha.franken.de> | 2021-02-13 11:51:45 +0300 |
| commit | 3440caf5f28c4e4a585dd5a7cead1b7c414973da (patch) | |
| tree | 706e3fd7cf657bca6e64d9095f75dd23d1ae09f9 /arch/mips/alchemy/common | |
| parent | 04e4783fccf4268249bff2c1be9f63013d12153a (diff) | |
| download | linux-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.c | 33 |
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 */ |