1#ifndef _ASM_S390_PCI_IO_H
2#define _ASM_S390_PCI_IO_H
3
4#ifdef CONFIG_PCI
5
6#include <linux/kernel.h>
7#include <linux/slab.h>
8#include <asm/pci_insn.h>
9
10
11#define ZPCI_IOMAP_MAX_ENTRIES 0x7fff
12#define ZPCI_IOMAP_ADDR_BASE 0x8000000000000000ULL
13#define ZPCI_IOMAP_ADDR_IDX_MASK 0x7fff000000000000ULL
14#define ZPCI_IOMAP_ADDR_OFF_MASK 0x0000ffffffffffffULL
15
16struct zpci_iomap_entry {
17 u32 fh;
18 u8 bar;
19};
20
21extern struct zpci_iomap_entry *zpci_iomap_start;
22
23#define ZPCI_IDX(addr) \
24 (((__force u64) addr & ZPCI_IOMAP_ADDR_IDX_MASK) >> 48)
25#define ZPCI_OFFSET(addr) \
26 ((__force u64) addr & ZPCI_IOMAP_ADDR_OFF_MASK)
27
28#define ZPCI_CREATE_REQ(handle, space, len) \
29 ((u64) handle << 32 | space << 16 | len)
30
31#define zpci_read(LENGTH, RETTYPE) \
32static inline RETTYPE zpci_read_##RETTYPE(const volatile void __iomem *addr) \
33{ \
34 struct zpci_iomap_entry *entry = &zpci_iomap_start[ZPCI_IDX(addr)]; \
35 u64 req = ZPCI_CREATE_REQ(entry->fh, entry->bar, LENGTH); \
36 u64 data; \
37 int rc; \
38 \
39 rc = zpci_load(&data, req, ZPCI_OFFSET(addr)); \
40 if (rc) \
41 data = -1ULL; \
42 return (RETTYPE) data; \
43}
44
45#define zpci_write(LENGTH, VALTYPE) \
46static inline void zpci_write_##VALTYPE(VALTYPE val, \
47 const volatile void __iomem *addr) \
48{ \
49 struct zpci_iomap_entry *entry = &zpci_iomap_start[ZPCI_IDX(addr)]; \
50 u64 req = ZPCI_CREATE_REQ(entry->fh, entry->bar, LENGTH); \
51 u64 data = (VALTYPE) val; \
52 \
53 zpci_store(data, req, ZPCI_OFFSET(addr)); \
54}
55
56zpci_read(8, u64)
57zpci_read(4, u32)
58zpci_read(2, u16)
59zpci_read(1, u8)
60zpci_write(8, u64)
61zpci_write(4, u32)
62zpci_write(2, u16)
63zpci_write(1, u8)
64
65static inline int zpci_write_single(u64 req, const u64 *data, u64 offset, u8 len)
66{
67 u64 val;
68
69 switch (len) {
70 case 1:
71 val = (u64) *((u8 *) data);
72 break;
73 case 2:
74 val = (u64) *((u16 *) data);
75 break;
76 case 4:
77 val = (u64) *((u32 *) data);
78 break;
79 case 8:
80 val = (u64) *((u64 *) data);
81 break;
82 default:
83 val = 0;
84 break;
85 }
86 return zpci_store(val, req, offset);
87}
88
89static inline int zpci_read_single(u64 req, u64 *dst, u64 offset, u8 len)
90{
91 u64 data;
92 int cc;
93
94 cc = zpci_load(&data, req, offset);
95 if (cc)
96 goto out;
97
98 switch (len) {
99 case 1:
100 *((u8 *) dst) = (u8) data;
101 break;
102 case 2:
103 *((u16 *) dst) = (u16) data;
104 break;
105 case 4:
106 *((u32 *) dst) = (u32) data;
107 break;
108 case 8:
109 *((u64 *) dst) = (u64) data;
110 break;
111 }
112out:
113 return cc;
114}
115
116static inline int zpci_write_block(u64 req, const u64 *data, u64 offset)
117{
118 return zpci_store_block(data, req, offset);
119}
120
121static inline u8 zpci_get_max_write_size(u64 src, u64 dst, int len, int max)
122{
123 int count = len > max ? max : len, size = 1;
124
125 while (!(src & 0x1) && !(dst & 0x1) && ((size << 1) <= count)) {
126 dst = dst >> 1;
127 src = src >> 1;
128 size = size << 1;
129 }
130 return size;
131}
132
133static inline int zpci_memcpy_fromio(void *dst,
134 const volatile void __iomem *src,
135 unsigned long n)
136{
137 struct zpci_iomap_entry *entry = &zpci_iomap_start[ZPCI_IDX(src)];
138 u64 req, offset = ZPCI_OFFSET(src);
139 int size, rc = 0;
140
141 while (n > 0) {
142 size = zpci_get_max_write_size((u64) src, (u64) dst, n, 8);
143 req = ZPCI_CREATE_REQ(entry->fh, entry->bar, size);
144 rc = zpci_read_single(req, dst, offset, size);
145 if (rc)
146 break;
147 offset += 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 struct zpci_iomap_entry *entry = &zpci_iomap_start[ZPCI_IDX(dst)];
158 u64 req, offset = ZPCI_OFFSET(dst);
159 int size, rc = 0;
160
161 if (!src)
162 return -EINVAL;
163
164 while (n > 0) {
165 size = zpci_get_max_write_size((u64) dst, (u64) src, n, 128);
166 req = ZPCI_CREATE_REQ(entry->fh, entry->bar, size);
167
168 if (size > 8)
169 rc = zpci_write_block(req, src, offset);
170 else
171 rc = zpci_write_single(req, src, offset, size);
172 if (rc)
173 break;
174 offset += size;
175 src += size;
176 n -= size;
177 }
178 return rc;
179}
180
181static inline int zpci_memset_io(volatile void __iomem *dst,
182 unsigned char val, size_t count)
183{
184 u8 *src = kmalloc(count, GFP_KERNEL);
185 int rc;
186
187 if (src == NULL)
188 return -ENOMEM;
189 memset(src, val, count);
190
191 rc = zpci_memcpy_toio(dst, src, count);
192 kfree(src);
193 return rc;
194}
195
196#endif
197
198#endif
199
