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 20static inline bool is_kseg2(void *addr) 21{ 22 return (unsigned long)addr >= KSEG2; 23} 24 25static 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 64static 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_dma(virt_to_phys_from_pte(addr)); 69 else 70 return phys_to_dma(virt_to_phys(addr)); 71} 72 73static inline dma_addr_t plat_map_dma_mem_page(struct device *dev, 74 struct page *page) 75{ 76 return phys_to_dma(page_to_phys(page)); 77} 78 79static inline unsigned long plat_dma_addr_to_phys(struct device *dev, 80 dma_addr_t dma_addr) 81{ 82 return dma_to_phys(dma_addr); 83} 84 85static 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 90static 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 103static inline void plat_extra_sync_for_device(struct device *dev) 104{ 105 return; 106} 107 108static inline int plat_dma_mapping_error(struct device *dev, 109 dma_addr_t dma_addr) 110{ 111 return 0; 112} 113 114static inline int plat_device_is_coherent(struct device *dev) 115{ 116 return 0; 117} 118 119#endif /* __ASM_MACH_POWERTV_DMA_COHERENCE_H */ 120