/* SPDX-License-Identifier: GPL-2.0 */ #ifndef ASMARM_DMA_MAPPING_H #define ASMARM_DMA_MAPPING_H #ifdef __KERNEL__ #include <linux/mm_types.h> #include <linux/scatterlist.h> #include <linux/dma-debug.h> #include <asm/memory.h> #include <xen/xen.h> #include <asm/xen/hypervisor.h> extern const struct dma_map_ops arm_dma_ops; extern const struct dma_map_ops arm_coherent_dma_ops; static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus) { return IS_ENABLED(CONFIG_MMU) ? &arm_dma_ops : &dma_noop_ops; } #ifdef __arch_page_to_dma #error Please update to __arch_pfn_to_dma #endif /* * dma_to_pfn/pfn_to_dma/dma_to_virt/virt_to_dma are architecture private * functions used internally by the DMA-mapping API to provide DMA * addresses. They must not be used by drivers. */ #ifndef __arch_pfn_to_dma static inline dma_addr_t pfn_to_dma(struct device *dev, unsigned long pfn) { if (dev) pfn -= dev->dma_pfn_offset; return (dma_addr_t)__pfn_to_bus(pfn); } static inline unsigned long dma_to_pfn(struct device *dev, dma_addr_t addr) { unsigned long pfn = __bus_to_pfn(addr); if (dev) pfn += dev->dma_pfn_offset; return pfn; } static inline void *dma_to_virt(struct device *dev, dma_addr_t addr) { if (dev) { unsigned long pfn = dma_to_pfn(dev, addr); return phys_to_virt(__pfn_to_phys(pfn)); } return (void *)__bus_to_virt((unsigned long)addr); } static inline dma_addr_t virt_to_dma(struct device *dev, void *addr) { if (dev) return pfn_to_dma(dev, virt_to_pfn(addr)); return (dma_addr_t)__virt_to_bus((unsigned long)(addr)); } #else static inline dma_addr_t pfn_to_dma(struct device *dev, unsigned long pfn) { return __arch_pfn_to_dma(dev, pfn); } static inline unsigned long dma_to_pfn(struct device *dev, dma_addr_t addr) { return __arch_dma_to_pfn(dev, addr); } static inline void *dma_to_virt(struct device *dev, dma_addr_t addr) { return __arch_dma_to_virt(dev, addr); } static inline dma_addr_t virt_to_dma(struct device *dev, void *addr) { return __arch_virt_to_dma(dev, addr); } #endif /* The ARM override for dma_max_pfn() */ static inline unsigned long dma_max_pfn(struct device *dev) { return dma_to_pfn(dev, *dev->dma_mask); } #define dma_max_pfn(dev) dma_max_pfn(dev) #define arch_setup_dma_ops arch_setup_dma_ops extern void arch_setup_dma_ops(struct device *dev, u64 dma_base, u64 size, const struct iommu_ops *iommu, bool coherent); #define arch_teardown_dma_ops arch_teardown_dma_ops extern void arch_teardown_dma_ops(struct device *dev); /* do not use this function in a driver */ static inline bool is_device_dma_coherent(struct device *dev) { return dev->archdata.dma_coherent; } static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr) { unsigned int offset = paddr & ~PAGE_MASK; return pfn_to_dma(dev, __phys_to_pfn(paddr)) + offset; } static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t dev_addr) { unsigned int offset = dev_addr & ~PAGE_MASK; return __pfn_to_phys(dma_to_pfn(dev, dev_addr)) + offset; } static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size) { u64 limit, mask; if (!dev->dma_mask) return 0; mask = *dev->dma_mask; limit = (mask + 1) & ~mask; if (limit && size > limit) return 0; if ((addr | (addr + size - 1)) & ~mask) return 0; return 1; } static inline void dma_mark_clean(void *addr, size_t size) { } /** * arm_dma_alloc - allocate consistent memory for DMA * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices * @size: required memory size * @handle: bus-specific DMA address * @attrs: optinal attributes that specific mapping properties * * Allocate some memory for a device for performing DMA. This function * allocates pages, and will return the CPU-viewed address, and sets @handle * to be the device-viewed address. */ extern void *arm_dma_alloc(struct device *dev, size_t size, dma_addr_t *handle, gfp_t gfp, unsigned long attrs); /** * arm_dma_free - free memory allocated by arm_dma_alloc * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices * @size: size of memory originally requested in dma_alloc_coherent * @cpu_addr: CPU-view address returned from dma_alloc_coherent * @handle: device-view address returned from dma_alloc_coherent * @attrs: optinal attributes that specific mapping properties * * Free (and unmap) a DMA buffer previously allocated by * arm_dma_alloc(). * * References to memory and mappings associated with cpu_addr/handle * during and after this call executing are illegal. */ extern void arm_dma_free(struct device *dev, size_t size, void *cpu_addr, dma_addr_t handle, unsigned long attrs); /** * arm_dma_mmap - map a coherent DMA allocation into user space * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices * @vma: vm_area_struct describing requested user mapping * @cpu_addr: kernel CPU-view address returned from dma_alloc_coherent * @handle: device-view address returned from dma_alloc_coherent * @size: size of memory originally requested in dma_alloc_coherent * @attrs: optinal attributes that specific mapping properties * * Map a coherent DMA buffer previously allocated by dma_alloc_coherent * into user space. The coherent DMA buffer must not be freed by the * driver until the user space mapping has been released. */ extern int arm_dma_mmap(struct device *dev, struct vm_area_struct *vma, void *cpu_addr, dma_addr_t dma_addr, size_t size, unsigned long attrs); /* * For SA-1111, IXP425, and ADI systems the dma-mapping functions are "magic" * and utilize bounce buffers as needed to work around limited DMA windows. * * On the SA-1111, a bug limits DMA to only certain regions of RAM. * On the IXP425, the PCI inbound window is 64MB (256MB total RAM) * On some ADI engineering systems, PCI inbound window is 32MB (12MB total RAM) * * The following are helper functions used by the dmabounce subystem * */ /** * dmabounce_register_dev * * @dev: valid struct device pointer * @small_buf_size: size of buffers to use with small buffer pool * @large_buf_size: size of buffers to use with large buffer pool (can be 0) * @needs_bounce_fn: called to determine whether buffer needs bouncing * * This function should be called by low-level platform code to register * a device as requireing DMA buffer bouncing. The function will allocate * appropriate DMA pools for the device. */ extern int dmabounce_register_dev(struct device *, unsigned long, unsigned long, int (*)(struct device *, dma_addr_t, size_t)); /** * dmabounce_unregister_dev * * @dev: valid struct device pointer * * This function should be called by low-level platform code when device * that was previously registered with dmabounce_register_dev is removed * from the system. * */ extern void dmabounce_unregister_dev(struct device *); /* * The scatter list versions of the above methods. */ extern int arm_dma_map_sg(struct device *, struct scatterlist *, int, enum dma_data_direction, unsigned long attrs); extern void arm_dma_unmap_sg(struct device *, struct scatterlist *, int, enum dma_data_direction, unsigned long attrs); extern void arm_dma_sync_sg_for_cpu(struct device *, struct scatterlist *, int, enum dma_data_direction); extern void arm_dma_sync_sg_for_device(struct device *, struct scatterlist *, int, enum dma_data_direction); extern int arm_dma_get_sgtable(struct device *dev, struct sg_table *sgt, void *cpu_addr, dma_addr_t dma_addr, size_t size, unsigned long attrs); #endif /* __KERNEL__ */ #endif
Name | Type | Size | Permission | Actions |
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hardware | Folder | 0755 |
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mach | Folder | 0755 |
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xen | Folder | 0755 |
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Kbuild | File | 568 B | 0644 |
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arch_gicv3.h | File | 9.05 KB | 0644 |
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arch_timer.h | File | 2.48 KB | 0644 |
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arm-cci.h | File | 1.05 KB | 0644 |
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asm-offsets.h | File | 35 B | 0644 |
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assembler.h | File | 10.46 KB | 0644 |
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atomic.h | File | 13.22 KB | 0644 |
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auxvec.h | File | 29 B | 0644 |
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bL_switcher.h | File | 2.28 KB | 0644 |
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barrier.h | File | 2.84 KB | 0644 |
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bitops.h | File | 8.62 KB | 0644 |
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bitrev.h | File | 451 B | 0644 |
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bug.h | File | 2.46 KB | 0644 |
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cache.h | File | 813 B | 0644 |
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cacheflush.h | File | 15.54 KB | 0644 |
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cachetype.h | File | 2.71 KB | 0644 |
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checksum.h | File | 3.71 KB | 0644 |
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clocksource.h | File | 153 B | 0644 |
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cmpxchg.h | File | 6.14 KB | 0644 |
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compiler.h | File | 978 B | 0644 |
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cp15.h | File | 3.84 KB | 0644 |
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cpu.h | File | 533 B | 0644 |
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cpufeature.h | File | 1.4 KB | 0644 |
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cpuidle.h | File | 1.33 KB | 0644 |
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cputype.h | File | 8.42 KB | 0644 |
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cti.h | File | 3.62 KB | 0644 |
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dcc.h | File | 1.01 KB | 0644 |
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delay.h | File | 2.83 KB | 0644 |
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device.h | File | 771 B | 0644 |
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div64.h | File | 3.17 KB | 0644 |
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dma-contiguous.h | File | 265 B | 0644 |
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dma-iommu.h | File | 1.01 KB | 0644 |
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dma-mapping.h | File | 7.44 KB | 0644 |
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dma.h | File | 4.18 KB | 0644 |
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dmi.h | File | 528 B | 0644 |
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domain.h | File | 3.65 KB | 0644 |
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ecard.h | File | 5.98 KB | 0644 |
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elf.h | File | 4.52 KB | 0644 |
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entry-macro-multi.S | File | 726 B | 0644 |
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exception.h | File | 571 B | 0644 |
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fb.h | File | 375 B | 0644 |
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fiq.h | File | 1.36 KB | 0644 |
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firmware.h | File | 1.82 KB | 0644 |
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fixmap.h | File | 1.84 KB | 0644 |
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flat.h | File | 915 B | 0644 |
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floppy.h | File | 3.61 KB | 0644 |
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fncpy.h | File | 3.08 KB | 0644 |
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fpstate.h | File | 1.73 KB | 0644 |
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ftrace.h | File | 1.92 KB | 0644 |
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futex.h | File | 4.24 KB | 0644 |
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glue-cache.h | File | 3.51 KB | 0644 |
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glue-proc.h | File | 4.46 KB | 0644 |
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glue.h | File | 759 B | 0644 |
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gpio.h | File | 693 B | 0644 |
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hardirq.h | File | 803 B | 0644 |
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highmem.h | File | 2.15 KB | 0644 |
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hugetlb-3level.h | File | 2.03 KB | 0644 |
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hugetlb.h | File | 1.78 KB | 0644 |
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hw_breakpoint.h | File | 3.53 KB | 0644 |
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hw_irq.h | File | 349 B | 0644 |
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hwcap.h | File | 378 B | 0644 |
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hypervisor.h | File | 140 B | 0644 |
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ide.h | File | 566 B | 0644 |
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idmap.h | File | 355 B | 0644 |
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insn.h | File | 636 B | 0644 |
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io.h | File | 15.96 KB | 0644 |
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irq.h | File | 1015 B | 0644 |
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irq_work.h | File | 234 B | 0644 |
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irqflags.h | File | 3.88 KB | 0644 |
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jump_label.h | File | 1009 B | 0644 |
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kexec-internal.h | File | 272 B | 0644 |
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kexec.h | File | 2.3 KB | 0644 |
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kgdb.h | File | 2.72 KB | 0644 |
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kmap_types.h | File | 190 B | 0644 |
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kprobes.h | File | 2.65 KB | 0644 |
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kvm_arm.h | File | 7.6 KB | 0644 |
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kvm_asm.h | File | 2.84 KB | 0644 |
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kvm_coproc.h | File | 1.99 KB | 0644 |
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kvm_emulate.h | File | 7.84 KB | 0644 |
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kvm_host.h | File | 10.31 KB | 0644 |
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kvm_hyp.h | File | 4.49 KB | 0644 |
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kvm_mmio.h | File | 1.34 KB | 0644 |
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kvm_mmu.h | File | 7.27 KB | 0644 |
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limits.h | File | 166 B | 0644 |
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linkage.h | File | 216 B | 0644 |
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mc146818rtc.h | File | 720 B | 0644 |
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mcpm.h | File | 11.92 KB | 0644 |
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mcs_spinlock.h | File | 570 B | 0644 |
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memblock.h | File | 248 B | 0644 |
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memory.h | File | 10.12 KB | 0644 |
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mmu.h | File | 953 B | 0644 |
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mmu_context.h | File | 3.94 KB | 0644 |
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module.h | File | 1.57 KB | 0644 |
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mpu.h | File | 2.15 KB | 0644 |
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mtd-xip.h | File | 666 B | 0644 |
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neon.h | File | 1.16 KB | 0644 |
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nwflash.h | File | 252 B | 0644 |
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opcodes-sec.h | File | 742 B | 0644 |
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opcodes-virt.h | File | 1.32 KB | 0644 |
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opcodes.h | File | 8.07 KB | 0644 |
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outercache.h | File | 3.78 KB | 0644 |
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page-nommu.h | File | 957 B | 0644 |
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page.h | File | 3.61 KB | 0644 |
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paravirt.h | File | 454 B | 0644 |
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patch.h | File | 438 B | 0644 |
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pci.h | File | 956 B | 0644 |
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percpu.h | File | 1.56 KB | 0644 |
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perf_event.h | File | 850 B | 0644 |
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pgalloc.h | File | 3.79 KB | 0644 |
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pgtable-2level-hwdef.h | File | 3.45 KB | 0644 |
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pgtable-2level-types.h | File | 1.84 KB | 0644 |
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pgtable-2level.h | File | 8.51 KB | 0644 |
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pgtable-3level-hwdef.h | File | 3.95 KB | 0644 |
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pgtable-3level-types.h | File | 1.89 KB | 0644 |
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pgtable-3level.h | File | 9.54 KB | 0644 |
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pgtable-hwdef.h | File | 467 B | 0644 |
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pgtable-nommu.h | File | 2.66 KB | 0644 |
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pgtable.h | File | 11.68 KB | 0644 |
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probes.h | File | 1.73 KB | 0644 |
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proc-fns.h | File | 4.79 KB | 0644 |
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processor.h | File | 3.4 KB | 0644 |
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procinfo.h | File | 1.27 KB | 0644 |
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prom.h | File | 715 B | 0644 |
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psci.h | File | 771 B | 0644 |
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ptrace.h | File | 4.89 KB | 0644 |
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sections.h | File | 189 B | 0644 |
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set_memory.h | File | 1.04 KB | 0644 |
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setup.h | File | 934 B | 0644 |
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shmparam.h | File | 419 B | 0644 |
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signal.h | File | 500 B | 0644 |
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smp.h | File | 3.1 KB | 0644 |
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smp_plat.h | File | 2.48 KB | 0644 |
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smp_scu.h | File | 1.32 KB | 0644 |
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smp_twd.h | File | 908 B | 0644 |
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sparsemem.h | File | 716 B | 0644 |
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spectre.h | File | 906 B | 0644 |
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spinlock.h | File | 5.49 KB | 0644 |
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spinlock_types.h | File | 541 B | 0644 |
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stackprotector.h | File | 1.09 KB | 0644 |
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stacktrace.h | File | 742 B | 0644 |
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stage2_pgtable.h | File | 2.12 KB | 0644 |
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string.h | File | 1.43 KB | 0644 |
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suspend.h | File | 369 B | 0644 |
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swab.h | File | 1005 B | 0644 |
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switch_to.h | File | 1.03 KB | 0644 |
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sync_bitops.h | File | 1.03 KB | 0644 |
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syscall.h | File | 2.48 KB | 0644 |
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system_info.h | File | 763 B | 0644 |
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system_misc.h | File | 1.14 KB | 0644 |
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tcm.h | File | 937 B | 0644 |
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therm.h | File | 655 B | 0644 |
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thread_info.h | File | 5.2 KB | 0644 |
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thread_notify.h | File | 1.2 KB | 0644 |
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timex.h | File | 577 B | 0644 |
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tlb.h | File | 7.37 KB | 0644 |
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tlbflush.h | File | 17.88 KB | 0644 |
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tls.h | File | 3.09 KB | 0644 |
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topology.h | File | 1.18 KB | 0644 |
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traps.h | File | 1.17 KB | 0644 |
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trusted_foundations.h | File | 2.29 KB | 0644 |
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uaccess-asm.h | File | 2.83 KB | 0644 |
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uaccess.h | File | 16.22 KB | 0644 |
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ucontext.h | File | 2.98 KB | 0644 |
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unaligned.h | File | 846 B | 0644 |
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unified.h | File | 1.61 KB | 0644 |
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unistd.h | File | 1.68 KB | 0644 |
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unwind.h | File | 1.71 KB | 0644 |
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uprobes.h | File | 1.07 KB | 0644 |
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user.h | File | 4.2 KB | 0644 |
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v7m.h | File | 2.93 KB | 0644 |
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vdso.h | File | 507 B | 0644 |
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vdso_datapage.h | File | 1.69 KB | 0644 |
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vfp.h | File | 2.86 KB | 0644 |
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vfpmacros.h | File | 2.1 KB | 0644 |
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vga.h | File | 305 B | 0644 |
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virt.h | File | 2.9 KB | 0644 |
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word-at-a-time.h | File | 2.08 KB | 0644 |
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xor.h | File | 5.22 KB | 0644 |
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