diff options
Diffstat (limited to 'target/linux/ixp4xx/patches-2.6.35/050-disable_dmabounce.patch')
| -rw-r--r-- | target/linux/ixp4xx/patches-2.6.35/050-disable_dmabounce.patch | 120 |
1 files changed, 120 insertions, 0 deletions
diff --git a/target/linux/ixp4xx/patches-2.6.35/050-disable_dmabounce.patch b/target/linux/ixp4xx/patches-2.6.35/050-disable_dmabounce.patch new file mode 100644 index 0000000000..f5d0a58c6c --- /dev/null +++ b/target/linux/ixp4xx/patches-2.6.35/050-disable_dmabounce.patch @@ -0,0 +1,120 @@ +--- a/arch/arm/Kconfig ++++ b/arch/arm/Kconfig +@@ -435,7 +435,6 @@ config ARCH_IXP4XX + select CPU_XSCALE + select GENERIC_GPIO + select GENERIC_CLOCKEVENTS +- select DMABOUNCE if PCI + help + Support for Intel's IXP4XX (XScale) family of processors. + +--- a/arch/arm/mach-ixp4xx/Kconfig ++++ b/arch/arm/mach-ixp4xx/Kconfig +@@ -199,6 +199,43 @@ config IXP4XX_INDIRECT_PCI + need to use the indirect method instead. If you don't know + what you need, leave this option unselected. + ++config IXP4XX_LEGACY_DMABOUNCE ++ bool "Legacy PCI DMA bounce support" ++ depends on PCI ++ default n ++ select DMABOUNCE ++ help ++ The IXP4xx is limited to a 64MB window for PCI DMA, which ++ requires that PCI accesses >= 64MB are bounced via buffers ++ below 64MB. ++ ++ The kernel has traditionally handled this issue by using ARM ++ specific DMA bounce support code for all accesses >= 64MB. ++ That code causes problems of its own, so it is desirable to ++ disable it. ++ ++ Enabling this option makes IXP4xx continue to use the problematic ++ ARM DMA bounce code. Disabling this option makes IXP4xx use the ++ kernel's generic bounce code. ++ ++ Say 'N'. ++ ++config IXP4XX_ZONE_DMA ++ bool "Support > 64MB RAM" ++ depends on !IXP4XX_LEGACY_DMABOUNCE ++ default y ++ select ZONE_DMA ++ help ++ The IXP4xx is limited to a 64MB window for PCI DMA, which ++ requires that PCI accesses above 64MB are bounced via buffers ++ below 64MB. ++ ++ Disabling this option allows you to omit the support code for ++ DMA-able memory allocations and DMA bouncing, but the kernel ++ will then not work properly if more than 64MB of RAM is present. ++ ++ Say 'Y' unless your platform is limited to <= 64MB of RAM. ++ + config IXP4XX_QMGR + tristate "IXP4xx Queue Manager support" + help +--- a/arch/arm/mach-ixp4xx/common-pci.c ++++ b/arch/arm/mach-ixp4xx/common-pci.c +@@ -321,27 +321,33 @@ static int abort_handler(unsigned long a + */ + static int ixp4xx_pci_platform_notify(struct device *dev) + { +- if(dev->bus == &pci_bus_type) { +- *dev->dma_mask = SZ_64M - 1; ++ if (dev->bus == &pci_bus_type) { ++ *dev->dma_mask = SZ_64M - 1; + dev->coherent_dma_mask = SZ_64M - 1; ++#ifdef CONFIG_DMABOUNCE + dmabounce_register_dev(dev, 2048, 4096); ++#endif + } + return 0; + } + + static int ixp4xx_pci_platform_notify_remove(struct device *dev) + { +- if(dev->bus == &pci_bus_type) { ++#ifdef CONFIG_DMABOUNCE ++ if (dev->bus == &pci_bus_type) + dmabounce_unregister_dev(dev); +- } ++#endif + return 0; + } + ++#ifdef CONFIG_DMABOUNCE + int dma_needs_bounce(struct device *dev, dma_addr_t dma_addr, size_t size) + { +- return (dev->bus == &pci_bus_type ) && ((dma_addr + size) >= SZ_64M); ++ return (dev->bus == &pci_bus_type ) && ((dma_addr + size) > SZ_64M); + } ++#endif + ++#ifdef CONFIG_ZONE_DMA + /* + * Only first 64MB of memory can be accessed via PCI. + * We use GFP_DMA to allocate safe buffers to do map/unmap. +@@ -364,6 +370,7 @@ void __init ixp4xx_adjust_zones(int node + zhole_size[1] = zhole_size[0]; + zhole_size[0] = 0; + } ++#endif + + void __init ixp4xx_pci_preinit(void) + { +--- a/arch/arm/mach-ixp4xx/include/mach/memory.h ++++ b/arch/arm/mach-ixp4xx/include/mach/memory.h +@@ -16,10 +16,12 @@ + + #if !defined(__ASSEMBLY__) && defined(CONFIG_PCI) + ++#ifdef CONFIG_ZONE_DMA + void ixp4xx_adjust_zones(int node, unsigned long *size, unsigned long *holes); + + #define arch_adjust_zones(node, size, holes) \ + ixp4xx_adjust_zones(node, size, holes) ++#endif + + #define ISA_DMA_THRESHOLD (SZ_64M - 1) + #define MAX_DMA_ADDRESS (PAGE_OFFSET + SZ_64M) |