| David VomLehn | a3a0f8c | 2009-08-30 17:15:11 -0700 | [diff] [blame^] | 1 | /* |
| 2 | * This file is subject to the terms and conditions of the GNU General Public |
| 3 | * License. See the file "COPYING" in the main directory of this archive |
| 4 | * for more details. |
| 5 | * |
| 6 | * Version from mach-generic modified to support PowerTV port |
| 7 | * Portions Copyright (C) 2009 Cisco Systems, Inc. |
| 8 | * Copyright (C) 2006 Ralf Baechle <ralf@linux-mips.org> |
| 9 | * |
| 10 | */ |
| 11 | |
| 12 | #ifndef __ASM_MACH_POWERTV_DMA_COHERENCE_H |
| 13 | #define __ASM_MACH_POWERTV_DMA_COHERENCE_H |
| 14 | |
| 15 | #include <linux/sched.h> |
| 16 | #include <linux/version.h> |
| 17 | #include <linux/device.h> |
| 18 | #include <asm/mach-powertv/asic.h> |
| 19 | |
| 20 | static inline bool is_kseg2(void *addr) |
| 21 | { |
| 22 | return (unsigned long)addr >= KSEG2; |
| 23 | } |
| 24 | |
| 25 | static inline unsigned long virt_to_phys_from_pte(void *addr) |
| 26 | { |
| 27 | pgd_t *pgd; |
| 28 | pud_t *pud; |
| 29 | pmd_t *pmd; |
| 30 | pte_t *ptep, pte; |
| 31 | |
| 32 | unsigned long virt_addr = (unsigned long)addr; |
| 33 | unsigned long phys_addr = 0UL; |
| 34 | |
| 35 | /* get the page global directory. */ |
| 36 | pgd = pgd_offset_k(virt_addr); |
| 37 | |
| 38 | if (!pgd_none(*pgd)) { |
| 39 | /* get the page upper directory */ |
| 40 | pud = pud_offset(pgd, virt_addr); |
| 41 | if (!pud_none(*pud)) { |
| 42 | /* get the page middle directory */ |
| 43 | pmd = pmd_offset(pud, virt_addr); |
| 44 | if (!pmd_none(*pmd)) { |
| 45 | /* get a pointer to the page table entry */ |
| 46 | ptep = pte_offset(pmd, virt_addr); |
| 47 | pte = *ptep; |
| 48 | /* check for a valid page */ |
| 49 | if (pte_present(pte)) { |
| 50 | /* get the physical address the page is |
| 51 | * refering to */ |
| 52 | phys_addr = (unsigned long) |
| 53 | page_to_phys(pte_page(pte)); |
| 54 | /* add the offset within the page */ |
| 55 | phys_addr |= (virt_addr & ~PAGE_MASK); |
| 56 | } |
| 57 | } |
| 58 | } |
| 59 | } |
| 60 | |
| 61 | return phys_addr; |
| 62 | } |
| 63 | |
| 64 | static inline dma_addr_t plat_map_dma_mem(struct device *dev, void *addr, |
| 65 | size_t size) |
| 66 | { |
| 67 | if (is_kseg2(addr)) |
| 68 | return phys_to_bus(virt_to_phys_from_pte(addr)); |
| 69 | else |
| 70 | return phys_to_bus(virt_to_phys(addr)); |
| 71 | } |
| 72 | |
| 73 | static inline dma_addr_t plat_map_dma_mem_page(struct device *dev, |
| 74 | struct page *page) |
| 75 | { |
| 76 | return phys_to_bus(page_to_phys(page)); |
| 77 | } |
| 78 | |
| 79 | static inline unsigned long plat_dma_addr_to_phys(struct device *dev, |
| 80 | dma_addr_t dma_addr) |
| 81 | { |
| 82 | return bus_to_phys(dma_addr); |
| 83 | } |
| 84 | |
| 85 | static inline void plat_unmap_dma_mem(struct device *dev, dma_addr_t dma_addr, |
| 86 | size_t size, enum dma_data_direction direction) |
| 87 | { |
| 88 | } |
| 89 | |
| 90 | static inline int plat_dma_supported(struct device *dev, u64 mask) |
| 91 | { |
| 92 | /* |
| 93 | * we fall back to GFP_DMA when the mask isn't all 1s, |
| 94 | * so we can't guarantee allocations that must be |
| 95 | * within a tighter range than GFP_DMA.. |
| 96 | */ |
| 97 | if (mask < DMA_BIT_MASK(24)) |
| 98 | return 0; |
| 99 | |
| 100 | return 1; |
| 101 | } |
| 102 | |
| 103 | static inline void plat_extra_sync_for_device(struct device *dev) |
| 104 | { |
| 105 | return; |
| 106 | } |
| 107 | |
| 108 | static inline int plat_dma_mapping_error(struct device *dev, |
| 109 | dma_addr_t dma_addr) |
| 110 | { |
| 111 | return 0; |
| 112 | } |
| 113 | |
| 114 | static inline int plat_device_is_coherent(struct device *dev) |
| 115 | { |
| 116 | return 0; |
| 117 | } |
| 118 | |
| 119 | #endif /* __ASM_MACH_POWERTV_DMA_COHERENCE_H */ |