| /* SPDX-License-Identifier: GPL-2.0 */ |
| |
| #ifndef _ASM_S390_DMA_TYPES_H_ |
| #define _ASM_S390_DMA_TYPES_H_ |
| |
| #include <linux/types.h> |
| #include <linux/io.h> |
| |
| /* |
| * typedef dma32_t |
| * Contains a 31 bit absolute address to a DMA capable piece of storage. |
| * |
| * For CIO, DMA addresses are always absolute addresses. These addresses tend |
| * to be used in architectured memory blocks (like ORB, IDAW, MIDAW). Under |
| * certain circumstances 31 bit wide addresses must be used because the |
| * address must fit in 31 bits. |
| * |
| * This type is to be used when such fields can be modelled as 32 bit wide. |
| */ |
| typedef u32 __bitwise dma32_t; |
| |
| /* |
| * typedef dma64_t |
| * Contains a 64 bit absolute address to a DMA capable piece of storage. |
| * |
| * For CIO, DMA addresses are always absolute addresses. These addresses tend |
| * to be used in architectured memory blocks (like ORB, IDAW, MIDAW). |
| * |
| * This type is to be used to model such 64 bit wide fields. |
| */ |
| typedef u64 __bitwise dma64_t; |
| |
| /* |
| * Although DMA addresses should be obtained using the DMA API, in cases when |
| * it is known that the first argument holds a virtual address that points to |
| * DMA-able 31 bit addressable storage, then this function can be safely used. |
| */ |
| static inline dma32_t virt_to_dma32(void *ptr) |
| { |
| return (__force dma32_t)__pa32(ptr); |
| } |
| |
| static inline void *dma32_to_virt(dma32_t addr) |
| { |
| return __va((__force unsigned long)addr); |
| } |
| |
| static inline dma32_t u32_to_dma32(u32 addr) |
| { |
| return (__force dma32_t)addr; |
| } |
| |
| static inline u32 dma32_to_u32(dma32_t addr) |
| { |
| return (__force u32)addr; |
| } |
| |
| static inline dma32_t dma32_add(dma32_t a, u32 b) |
| { |
| return (__force dma32_t)((__force u32)a + b); |
| } |
| |
| static inline dma32_t dma32_and(dma32_t a, u32 b) |
| { |
| return (__force dma32_t)((__force u32)a & b); |
| } |
| |
| /* |
| * Although DMA addresses should be obtained using the DMA API, in cases when |
| * it is known that the first argument holds a virtual address that points to |
| * DMA-able storage, then this function can be safely used. |
| */ |
| static inline dma64_t virt_to_dma64(void *ptr) |
| { |
| return (__force dma64_t)__pa(ptr); |
| } |
| |
| static inline void *dma64_to_virt(dma64_t addr) |
| { |
| return __va((__force unsigned long)addr); |
| } |
| |
| static inline dma64_t u64_to_dma64(u64 addr) |
| { |
| return (__force dma64_t)addr; |
| } |
| |
| static inline u64 dma64_to_u64(dma64_t addr) |
| { |
| return (__force u64)addr; |
| } |
| |
| static inline dma64_t dma64_add(dma64_t a, u64 b) |
| { |
| return (__force dma64_t)((__force u64)a + b); |
| } |
| |
| static inline dma64_t dma64_and(dma64_t a, u64 b) |
| { |
| return (__force dma64_t)((__force u64)a & b); |
| } |
| |
| #endif /* _ASM_S390_DMA_TYPES_H_ */ |