diff options
| author | Joerg Roedel <joerg.roedel@amd.com> | 2008-06-26 21:27:43 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-06-27 10:12:09 +0200 |
| commit | 6c56747b46717b4c6a890b35e8518f4be961dc7e (patch) | |
| tree | 90e30fd9df9945f298a8e9fb7af3bce8438d00c2 /arch/x86/kernel | |
| parent | ca7ed057ae25e5e60814f950995f22f051d2e449 (diff) | |
x86, AMD IOMMU: add functions for mapping/unmapping the MMIO space
This patch contains two functions to map and unmap the MMIO region of an IOMMU.
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Cc: iommu@lists.linux-foundation.org
Cc: bhavna.sarathy@amd.com
Cc: Sebastian.Biemueller@amd.com
Cc: robert.richter@amd.com
Cc: joro@8bytes.org
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/kernel')
| -rw-r--r-- | arch/x86/kernel/amd_iommu_init.c | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/arch/x86/kernel/amd_iommu_init.c b/arch/x86/kernel/amd_iommu_init.c index ee0b2da027b..3147e699100 100644 --- a/arch/x86/kernel/amd_iommu_init.c +++ b/arch/x86/kernel/amd_iommu_init.c @@ -117,6 +117,29 @@ static u32 dev_table_size; static u32 alias_table_size; static u32 rlookup_table_size; +static u8 * __init iommu_map_mmio_space(u64 address) +{ + u8 *ret; + + if (!request_mem_region(address, MMIO_REGION_LENGTH, "amd_iommu")) + return NULL; + + ret = ioremap_nocache(address, MMIO_REGION_LENGTH); + if (ret != NULL) + return ret; + + release_mem_region(address, MMIO_REGION_LENGTH); + + return NULL; +} + +static void __init iommu_unmap_mmio_space(struct amd_iommu *iommu) +{ + if (iommu->mmio_base) + iounmap(iommu->mmio_base); + release_mem_region(iommu->mmio_phys, MMIO_REGION_LENGTH); +} + static int __init find_last_devid_on_pci(int bus, int dev, int fn, int cap_ptr) { u32 cap; |