diff options
Diffstat (limited to 'arch/powerpc/kernel/dma-swiotlb.c')
| -rw-r--r-- | arch/powerpc/kernel/dma-swiotlb.c | 43 |
1 files changed, 40 insertions, 3 deletions
diff --git a/arch/powerpc/kernel/dma-swiotlb.c b/arch/powerpc/kernel/dma-swiotlb.c index 4295e0b94b2..bd1a2aba599 100644 --- a/arch/powerpc/kernel/dma-swiotlb.c +++ b/arch/powerpc/kernel/dma-swiotlb.c @@ -12,6 +12,7 @@ */ #include <linux/dma-mapping.h> +#include <linux/memblock.h> #include <linux/pfn.h> #include <linux/of_platform.h> #include <linux/platform_device.h> @@ -20,10 +21,24 @@ #include <asm/machdep.h> #include <asm/swiotlb.h> #include <asm/dma.h> -#include <asm/abs_addr.h> unsigned int ppc_swiotlb_enable; +static u64 swiotlb_powerpc_get_required(struct device *dev) +{ + u64 end, mask, max_direct_dma_addr = dev->archdata.max_direct_dma_addr; + + end = memblock_end_of_DRAM(); + if (max_direct_dma_addr && end > max_direct_dma_addr) + end = max_direct_dma_addr; + end += get_dma_offset(dev); + + mask = 1ULL << (fls64(end) - 1); + mask += mask - 1; + + return mask; +} + /* * At the moment, all platforms that use this code only require * swiotlb to be used if we're operating on HIGHMEM. Since @@ -32,8 +47,9 @@ unsigned int ppc_swiotlb_enable; * for everything else. */ struct dma_map_ops swiotlb_dma_ops = { - .alloc_coherent = dma_direct_alloc_coherent, - .free_coherent = dma_direct_free_coherent, + .alloc = dma_direct_alloc_coherent, + .free = dma_direct_free_coherent, + .mmap = dma_direct_mmap_coherent, .map_sg = swiotlb_map_sg_attrs, .unmap_sg = swiotlb_unmap_sg_attrs, .dma_supported = swiotlb_dma_supported, @@ -44,6 +60,7 @@ struct dma_map_ops swiotlb_dma_ops = { .sync_sg_for_cpu = swiotlb_sync_sg_for_cpu, .sync_sg_for_device = swiotlb_sync_sg_for_device, .mapping_error = swiotlb_dma_mapping_error, + .get_required_mask = swiotlb_powerpc_get_required, }; void pci_dma_dev_setup_swiotlb(struct pci_dev *pdev) @@ -88,3 +105,23 @@ int __init swiotlb_setup_bus_notifier(void) &ppc_swiotlb_plat_bus_notifier); return 0; } + +void swiotlb_detect_4g(void) +{ + if ((memblock_end_of_DRAM() - 1) > 0xffffffff) + ppc_swiotlb_enable = 1; +} + +static int __init swiotlb_late_init(void) +{ + if (ppc_swiotlb_enable) { + swiotlb_print_info(); + set_pci_dma_ops(&swiotlb_dma_ops); + ppc_md.pci_dma_dev_setup = pci_dma_dev_setup_swiotlb; + } else { + swiotlb_free(); + } + + return 0; +} +subsys_initcall(swiotlb_late_init); |