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| author |   Paul Mundt <lethal@linux-sh.org> | 2009-05-26 23:13:13 +0900 |
|---|---|---|
| committer | Paul Mundt <lethal@linux-sh.org> | 2009-05-26 23:13:13 +0900 |
| commit | b7e2ac619465f1774b827d9997109ceef4a61851 (patch) | |
| tree | 6cb846c7f6c3b71e9f6ae9560e539e61f724f284 /arch/sh/include/asm/pci.h | |
| parent | sh: pci-sh7751: Initialize io_map_base in controller definition. (diff) | |
| download | linux-dev-b7e2ac619465f1774b827d9997109ceef4a61851.tar.xz linux-dev-b7e2ac619465f1774b827d9997109ceef4a61851.zip | |
sh: pci: Disable MWI and make pci_dma_burst_advice() a bit more accurate.
None of the SH PCI controllers support MWI, it is always treated as a
direct memory write, so simply disable it outright. In the case of the
PCI cache line size, consult that for the pci_dma_burst_advice()
strategy, and switch over to PCI_DMA_BURST_MULTIPLE, as PPC64.
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Diffstat (limited to 'arch/sh/include/asm/pci.h')
| -rw-r--r-- | arch/sh/include/asm/pci.h | 20 |
1 files changed, 18 insertions, 2 deletions
diff --git a/arch/sh/include/asm/pci.h b/arch/sh/include/asm/pci.h index 5b2e0fcdfc22..ae0da6f48b6d 100644 --- a/arch/sh/include/asm/pci.h +++ b/arch/sh/include/asm/pci.h @@ -89,12 +89,28 @@ static inline void pcibios_penalize_isa_irq(int irq, int active) #endif #ifdef CONFIG_PCI +/* + * None of the SH PCI controllers support MWI, it is always treated as a + * direct memory write. + */ +#define PCI_DISABLE_MWI + static inline void pci_dma_burst_advice(struct pci_dev *pdev, enum pci_dma_burst_strategy *strat, unsigned long *strategy_parameter) { - *strat = PCI_DMA_BURST_INFINITY; - *strategy_parameter = ~0UL; + unsigned long cacheline_size; + u8 byte; + + pci_read_config_byte(pdev, PCI_CACHE_LINE_SIZE, &byte); + + if (byte == 0) + cacheline_size = L1_CACHE_BYTES; + else + cacheline_size = byte << 2; + + *strat = PCI_DMA_BURST_MULTIPLE; + *strategy_parameter = cacheline_size; } #endif |