| /* 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_direct_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; |
| } |
| |
| /** |
| * 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 |
