104 lines
2.5 KiB
C
104 lines
2.5 KiB
C
/* 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_ */
|