mmio.h revision 331769 
1/* Licensed under the OpenIB.org BSD license (FreeBSD Variant) - See COPYING.md
2 */
3#ifndef MMIO_H
4#define MMIO_H
5
6#include <unistd.h>
7#include <sys/syscall.h>
8#ifdef __s390x__
9
10static inline long mmio_writeb(const unsigned long mmio_addr,
11			       const uint8_t val)
12{
13	return syscall(__NR_s390_pci_mmio_write, mmio_addr, &val, sizeof(val));
14}
15
16static inline long mmio_writew(const unsigned long mmio_addr,
17			       const uint16_t val)
18{
19	return syscall(__NR_s390_pci_mmio_write, mmio_addr, &val, sizeof(val));
20}
21
22static inline long mmio_writel(const unsigned long mmio_addr,
23			       const uint32_t val)
24{
25	return syscall(__NR_s390_pci_mmio_write, mmio_addr, &val, sizeof(val));
26}
27
28static inline long mmio_writeq(const unsigned long mmio_addr,
29			       const uint64_t val)
30{
31	return syscall(__NR_s390_pci_mmio_write, mmio_addr, &val, sizeof(val));
32}
33
34static inline long mmio_write(const unsigned long mmio_addr,
35			      const void *val,
36			      const size_t length)
37{
38	return syscall(__NR_s390_pci_mmio_write, mmio_addr, val, length);
39}
40
41static inline long mmio_readb(const unsigned long mmio_addr, uint8_t *val)
42{
43	return syscall(__NR_s390_pci_mmio_read, mmio_addr, val, sizeof(*val));
44}
45
46static inline long mmio_readw(const unsigned long mmio_addr, uint16_t *val)
47{
48	return syscall(__NR_s390_pci_mmio_read, mmio_addr, val, sizeof(*val));
49}
50
51static inline long mmio_readl(const unsigned long mmio_addr, uint32_t *val)
52{
53	return syscall(__NR_s390_pci_mmio_read, mmio_addr, val, sizeof(*val));
54}
55
56static inline long mmio_readq(const unsigned long mmio_addr, uint64_t *val)
57{
58	return syscall(__NR_s390_pci_mmio_read, mmio_addr, val, sizeof(*val));
59}
60
61static inline long mmio_read(const unsigned long mmio_addr,
62			     void *val,
63			     const size_t length)
64{
65	return syscall(__NR_s390_pci_mmio_read, mmio_addr, val, length);
66}
67
68static inline void mlx4_bf_copy(unsigned long *dst,
69				unsigned long *src,
70				unsigned bytecnt)
71{
72	mmio_write((unsigned long)dst, src, bytecnt);
73}
74
75#else
76
77#define mmio_writeb(addr, value) \
78	(*((volatile uint8_t *)addr) = value)
79#define mmio_writew(addr, value) \
80	(*((volatile uint16_t *)addr) = value)
81#define mmio_writel(addr, value) \
82	(*((volatile uint32_t *)addr) = value)
83#define mmio_writeq(addr, value) \
84	(*((volatile uint64_t *)addr) = value)
85#define mmio_write(addr, value, length) \
86	memcpy(addr, value, length)
87
88#define mmio_readb(addr, value) \
89	(value = *((volatile uint8_t *)addr))
90#define mmio_readw(addr, value) \
91	(value = *((volatile uint16_t *)addr))
92#define mmio_readl(addr, value) \
93	(value = *((volatile uint32_t *)addr))
94#define mmio_readq(addr, value) \
95	(value = *((volatile uint64_t *)addr))
96#define mmio_read(addr, value, length) \
97	memcpy(value, addr, length)
98
99/*
100 * Avoid using memcpy() to copy to BlueFlame page, since memcpy()
101 * implementations may use move-string-buffer assembler instructions,
102 * which do not guarantee order of copying.
103 */
104static inline void mlx4_bf_copy(unsigned long *dst,
105				unsigned long *src,
106				unsigned bytecnt)
107{
108	while (bytecnt > 0) {
109		*dst++ = *src++;
110		*dst++ = *src++;
111		bytecnt -= 2 * sizeof(long);
112	}
113}
114#endif
115
116#endif
117