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Linux kernel mirror (for testing)
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linux
1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _ASM_S390_PCI_IO_H
3#define _ASM_S390_PCI_IO_H
4
5#ifdef CONFIG_PCI
6
7#include <linux/kernel.h>
8#include <linux/slab.h>
9#include <asm/pci_insn.h>
10
11/* I/O Map */
12#define ZPCI_IOMAP_SHIFT 48
13#define ZPCI_IOMAP_ADDR_BASE 0x8000000000000000UL
14#define ZPCI_IOMAP_ADDR_OFF_MASK ((1UL << ZPCI_IOMAP_SHIFT) - 1)
15#define ZPCI_IOMAP_MAX_ENTRIES \
16 ((ULONG_MAX - ZPCI_IOMAP_ADDR_BASE + 1) / (1UL << ZPCI_IOMAP_SHIFT))
17#define ZPCI_IOMAP_ADDR_IDX_MASK \
18 (~ZPCI_IOMAP_ADDR_OFF_MASK - ZPCI_IOMAP_ADDR_BASE)
19
20struct zpci_iomap_entry {
21 u32 fh;
22 u8 bar;
23 u16 count;
24};
25
26extern struct zpci_iomap_entry *zpci_iomap_start;
27
28#define ZPCI_ADDR(idx) (ZPCI_IOMAP_ADDR_BASE | ((u64) idx << ZPCI_IOMAP_SHIFT))
29#define ZPCI_IDX(addr) \
30 (((__force u64) addr & ZPCI_IOMAP_ADDR_IDX_MASK) >> ZPCI_IOMAP_SHIFT)
31#define ZPCI_OFFSET(addr) \
32 ((__force u64) addr & ZPCI_IOMAP_ADDR_OFF_MASK)
33
34#define ZPCI_CREATE_REQ(handle, space, len) \
35 ((u64) handle << 32 | space << 16 | len)
36
37#define zpci_read(LENGTH, RETTYPE) \
38static inline RETTYPE zpci_read_##RETTYPE(const volatile void __iomem *addr) \
39{ \
40 u64 data; \
41 int rc; \
42 \
43 rc = zpci_load(&data, addr, LENGTH); \
44 if (rc) \
45 data = -1ULL; \
46 return (RETTYPE) data; \
47}
48
49#define zpci_write(LENGTH, VALTYPE) \
50static inline void zpci_write_##VALTYPE(VALTYPE val, \
51 const volatile void __iomem *addr) \
52{ \
53 u64 data = (VALTYPE) val; \
54 \
55 zpci_store(addr, data, LENGTH); \
56}
57
58zpci_read(8, u64)
59zpci_read(4, u32)
60zpci_read(2, u16)
61zpci_read(1, u8)
62zpci_write(8, u64)
63zpci_write(4, u32)
64zpci_write(2, u16)
65zpci_write(1, u8)
66
67static inline int zpci_write_single(volatile void __iomem *dst, const void *src,
68 unsigned long len)
69{
70 u64 val;
71
72 switch (len) {
73 case 1:
74 val = (u64) *((u8 *) src);
75 break;
76 case 2:
77 val = (u64) *((u16 *) src);
78 break;
79 case 4:
80 val = (u64) *((u32 *) src);
81 break;
82 case 8:
83 val = (u64) *((u64 *) src);
84 break;
85 default:
86 val = 0; /* let FW report error */
87 break;
88 }
89 return zpci_store(dst, val, len);
90}
91
92static inline int zpci_read_single(void *dst, const volatile void __iomem *src,
93 unsigned long len)
94{
95 u64 data;
96 int cc;
97
98 cc = zpci_load(&data, src, len);
99 if (cc)
100 goto out;
101
102 switch (len) {
103 case 1:
104 *((u8 *) dst) = (u8) data;
105 break;
106 case 2:
107 *((u16 *) dst) = (u16) data;
108 break;
109 case 4:
110 *((u32 *) dst) = (u32) data;
111 break;
112 case 8:
113 *((u64 *) dst) = (u64) data;
114 break;
115 }
116out:
117 return cc;
118}
119
120int zpci_write_block(volatile void __iomem *dst, const void *src,
121 unsigned long len);
122
123static inline u8 zpci_get_max_write_size(u64 src, u64 dst, int len, int max)
124{
125 int count = len > max ? max : len, size = 1;
126
127 while (!(src & 0x1) && !(dst & 0x1) && ((size << 1) <= count)) {
128 dst = dst >> 1;
129 src = src >> 1;
130 size = size << 1;
131 }
132 return size;
133}
134
135static inline int zpci_memcpy_fromio(void *dst,
136 const volatile void __iomem *src,
137 unsigned long n)
138{
139 int size, rc = 0;
140
141 while (n > 0) {
142 size = zpci_get_max_write_size((u64 __force) src,
143 (u64) dst, n, 8);
144 rc = zpci_read_single(dst, src, size);
145 if (rc)
146 break;
147 src += size;
148 dst += size;
149 n -= size;
150 }
151 return rc;
152}
153
154static inline int zpci_memcpy_toio(volatile void __iomem *dst,
155 const void *src, unsigned long n)
156{
157 int size, rc = 0;
158
159 if (!src)
160 return -EINVAL;
161
162 while (n > 0) {
163 size = zpci_get_max_write_size((u64 __force) dst,
164 (u64) src, n, 128);
165 if (size > 8) /* main path */
166 rc = zpci_write_block(dst, src, size);
167 else
168 rc = zpci_write_single(dst, src, size);
169 if (rc)
170 break;
171 src += size;
172 dst += size;
173 n -= size;
174 }
175 return rc;
176}
177
178static inline int zpci_memset_io(volatile void __iomem *dst,
179 unsigned char val, size_t count)
180{
181 u8 *src = kmalloc(count, GFP_KERNEL);
182 int rc;
183
184 if (src == NULL)
185 return -ENOMEM;
186 memset(src, val, count);
187
188 rc = zpci_memcpy_toio(dst, src, count);
189 kfree(src);
190 return rc;
191}
192
193#endif /* CONFIG_PCI */
194
195#endif /* _ASM_S390_PCI_IO_H */