diff options
author | Linus Torvalds <torvalds@linux-foundation.org> | 2009-06-15 09:32:52 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-06-15 09:32:52 -0700 |
commit | 0fa213310cd8fa7a51071cdcf130e26fa56e9549 (patch) | |
tree | 2a7e5cc33c8938ec82604a99c3797a3132fd91ec /arch/powerpc/kernel/dma-swiotlb.c | |
parent | d3bf80bff13597004b5724ee4549cd68eb0badf0 (diff) | |
parent | bc47ab0241c7c86da4f5e5f82fbca7d45387c18d (diff) |
Merge branch 'merge' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc
* 'merge' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc: (103 commits)
powerpc: Fix bug in move of altivec code to vector.S
powerpc: Add support for swiotlb on 32-bit
powerpc/spufs: Remove unused error path
powerpc: Fix warning when printing a resource_size_t
powerpc/xmon: Remove unused variable in xmon.c
powerpc/pseries: Fix warnings when printing resource_size_t
powerpc: Shield code specific to 64-bit server processors
powerpc: Separate PACA fields for server CPUs
powerpc: Split exception handling out of head_64.S
powerpc: Introduce CONFIG_PPC_BOOK3S
powerpc: Move VMX and VSX asm code to vector.S
powerpc: Set init_bootmem_done on NUMA platforms as well
powerpc/mm: Fix a AB->BA deadlock scenario with nohash MMU context lock
powerpc/mm: Fix some SMP issues with MMU context handling
powerpc: Add PTRACE_SINGLEBLOCK support
fbdev: Add PLB support and cleanup DCR in xilinxfb driver.
powerpc/virtex: Add ml510 reference design device tree
powerpc/virtex: Add Xilinx ML510 reference design support
powerpc/virtex: refactor intc driver and add support for i8259 cascading
powerpc/virtex: Add support for Xilinx PCI host bridge
...
Diffstat (limited to 'arch/powerpc/kernel/dma-swiotlb.c')
-rw-r--r-- | arch/powerpc/kernel/dma-swiotlb.c | 163 |
1 files changed, 163 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/dma-swiotlb.c b/arch/powerpc/kernel/dma-swiotlb.c new file mode 100644 index 00000000000..68ccf11e4f1 --- /dev/null +++ b/arch/powerpc/kernel/dma-swiotlb.c @@ -0,0 +1,163 @@ +/* + * Contains routines needed to support swiotlb for ppc. + * + * Copyright (C) 2009 Becky Bruce, Freescale Semiconductor + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the + * Free Software Foundation; either version 2 of the License, or (at your + * option) any later version. + * + */ + +#include <linux/dma-mapping.h> +#include <linux/pfn.h> +#include <linux/of_platform.h> +#include <linux/platform_device.h> +#include <linux/pci.h> + +#include <asm/machdep.h> +#include <asm/swiotlb.h> +#include <asm/dma.h> +#include <asm/abs_addr.h> + +int swiotlb __read_mostly; +unsigned int ppc_swiotlb_enable; + +void *swiotlb_bus_to_virt(struct device *hwdev, dma_addr_t addr) +{ + unsigned long pfn = PFN_DOWN(swiotlb_bus_to_phys(hwdev, addr)); + void *pageaddr = page_address(pfn_to_page(pfn)); + + if (pageaddr != NULL) + return pageaddr + (addr % PAGE_SIZE); + return NULL; +} + +dma_addr_t swiotlb_phys_to_bus(struct device *hwdev, phys_addr_t paddr) +{ + return paddr + get_dma_direct_offset(hwdev); +} + +phys_addr_t swiotlb_bus_to_phys(struct device *hwdev, dma_addr_t baddr) + +{ + return baddr - get_dma_direct_offset(hwdev); +} + +/* + * Determine if an address needs bounce buffering via swiotlb. + * Going forward I expect the swiotlb code to generalize on using + * a dma_ops->addr_needs_map, and this function will move from here to the + * generic swiotlb code. + */ +int +swiotlb_arch_address_needs_mapping(struct device *hwdev, dma_addr_t addr, + size_t size) +{ + struct dma_mapping_ops *dma_ops = get_dma_ops(hwdev); + + BUG_ON(!dma_ops); + return dma_ops->addr_needs_map(hwdev, addr, size); +} + +/* + * Determine if an address is reachable by a pci device, or if we must bounce. + */ +static int +swiotlb_pci_addr_needs_map(struct device *hwdev, dma_addr_t addr, size_t size) +{ + u64 mask = dma_get_mask(hwdev); + dma_addr_t max; + struct pci_controller *hose; + struct pci_dev *pdev = to_pci_dev(hwdev); + + hose = pci_bus_to_host(pdev->bus); + max = hose->dma_window_base_cur + hose->dma_window_size; + + /* check that we're within mapped pci window space */ + if ((addr + size > max) | (addr < hose->dma_window_base_cur)) + return 1; + + return !is_buffer_dma_capable(mask, addr, size); +} + +static int +swiotlb_addr_needs_map(struct device *hwdev, dma_addr_t addr, size_t size) +{ + return !is_buffer_dma_capable(dma_get_mask(hwdev), addr, size); +} + + +/* + * At the moment, all platforms that use this code only require + * swiotlb to be used if we're operating on HIGHMEM. Since + * we don't ever call anything other than map_sg, unmap_sg, + * map_page, and unmap_page on highmem, use normal dma_ops + * for everything else. + */ +struct dma_mapping_ops swiotlb_dma_ops = { + .alloc_coherent = dma_direct_alloc_coherent, + .free_coherent = dma_direct_free_coherent, + .map_sg = swiotlb_map_sg_attrs, + .unmap_sg = swiotlb_unmap_sg_attrs, + .dma_supported = swiotlb_dma_supported, + .map_page = swiotlb_map_page, + .unmap_page = swiotlb_unmap_page, + .addr_needs_map = swiotlb_addr_needs_map, + .sync_single_range_for_cpu = swiotlb_sync_single_range_for_cpu, + .sync_single_range_for_device = swiotlb_sync_single_range_for_device, + .sync_sg_for_cpu = swiotlb_sync_sg_for_cpu, + .sync_sg_for_device = swiotlb_sync_sg_for_device +}; + +struct dma_mapping_ops swiotlb_pci_dma_ops = { + .alloc_coherent = dma_direct_alloc_coherent, + .free_coherent = dma_direct_free_coherent, + .map_sg = swiotlb_map_sg_attrs, + .unmap_sg = swiotlb_unmap_sg_attrs, + .dma_supported = swiotlb_dma_supported, + .map_page = swiotlb_map_page, + .unmap_page = swiotlb_unmap_page, + .addr_needs_map = swiotlb_pci_addr_needs_map, + .sync_single_range_for_cpu = swiotlb_sync_single_range_for_cpu, + .sync_single_range_for_device = swiotlb_sync_single_range_for_device, + .sync_sg_for_cpu = swiotlb_sync_sg_for_cpu, + .sync_sg_for_device = swiotlb_sync_sg_for_device +}; + +static int ppc_swiotlb_bus_notify(struct notifier_block *nb, + unsigned long action, void *data) +{ + struct device *dev = data; + + /* We are only intereted in device addition */ + if (action != BUS_NOTIFY_ADD_DEVICE) + return 0; + + /* May need to bounce if the device can't address all of DRAM */ + if (dma_get_mask(dev) < lmb_end_of_DRAM()) + set_dma_ops(dev, &swiotlb_dma_ops); + + return NOTIFY_DONE; +} + +static struct notifier_block ppc_swiotlb_plat_bus_notifier = { + .notifier_call = ppc_swiotlb_bus_notify, + .priority = 0, +}; + +static struct notifier_block ppc_swiotlb_of_bus_notifier = { + .notifier_call = ppc_swiotlb_bus_notify, + .priority = 0, +}; + +int __init swiotlb_setup_bus_notifier(void) +{ + bus_register_notifier(&platform_bus_type, + &ppc_swiotlb_plat_bus_notifier); + bus_register_notifier(&of_platform_bus_type, + &ppc_swiotlb_of_bus_notifier); + + return 0; +} |