1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _ASM_S390_PCI_IO_H
3 #define _ASM_S390_PCI_IO_H
7 #include <linux/kernel.h>
8 #include <linux/slab.h>
9 #include <asm/pci_insn.h>
11 /* I/O size constraints */
12 #define ZPCI_MAX_READ_SIZE 8
13 #define ZPCI_MAX_WRITE_SIZE 128
16 #define ZPCI_IOMAP_SHIFT 48
17 #define ZPCI_IOMAP_ADDR_BASE 0x8000000000000000UL
18 #define ZPCI_IOMAP_ADDR_OFF_MASK ((1UL << ZPCI_IOMAP_SHIFT) - 1)
19 #define ZPCI_IOMAP_MAX_ENTRIES \
20 ((ULONG_MAX - ZPCI_IOMAP_ADDR_BASE + 1) / (1UL << ZPCI_IOMAP_SHIFT))
21 #define ZPCI_IOMAP_ADDR_IDX_MASK \
22 (~ZPCI_IOMAP_ADDR_OFF_MASK - ZPCI_IOMAP_ADDR_BASE)
24 struct zpci_iomap_entry {
30 extern struct zpci_iomap_entry *zpci_iomap_start;
32 #define ZPCI_ADDR(idx) (ZPCI_IOMAP_ADDR_BASE | ((u64) idx << ZPCI_IOMAP_SHIFT))
33 #define ZPCI_IDX(addr) \
34 (((__force u64) addr & ZPCI_IOMAP_ADDR_IDX_MASK) >> ZPCI_IOMAP_SHIFT)
35 #define ZPCI_OFFSET(addr) \
36 ((__force u64) addr & ZPCI_IOMAP_ADDR_OFF_MASK)
38 #define ZPCI_CREATE_REQ(handle, space, len) \
39 ((u64) handle << 32 | space << 16 | len)
41 #define zpci_read(LENGTH, RETTYPE) \
42 static inline RETTYPE zpci_read_##RETTYPE(const volatile void __iomem *addr) \
47 rc = zpci_load(&data, addr, LENGTH); \
50 return (RETTYPE) data; \
53 #define zpci_write(LENGTH, VALTYPE) \
54 static inline void zpci_write_##VALTYPE(VALTYPE val, \
55 const volatile void __iomem *addr) \
57 u64 data = (VALTYPE) val; \
59 zpci_store(addr, data, LENGTH); \
71 static inline int zpci_write_single(volatile void __iomem *dst, const void *src,
78 val = (u64) *((u8 *) src);
81 val = (u64) *((u16 *) src);
84 val = (u64) *((u32 *) src);
87 val = (u64) *((u64 *) src);
90 val = 0; /* let FW report error */
93 return zpci_store(dst, val, len);
96 static inline int zpci_read_single(void *dst, const volatile void __iomem *src,
102 cc = zpci_load(&data, src, len);
108 *((u8 *) dst) = (u8) data;
111 *((u16 *) dst) = (u16) data;
114 *((u32 *) dst) = (u32) data;
117 *((u64 *) dst) = (u64) data;
124 int zpci_write_block(volatile void __iomem *dst, const void *src,
127 static inline u8 zpci_get_max_write_size(u64 src, u64 dst, int len, int max)
129 int count = len > max ? max : len, size = 1;
131 while (!(src & 0x1) && !(dst & 0x1) && ((size << 1) <= count)) {
139 static inline int zpci_memcpy_fromio(void *dst,
140 const volatile void __iomem *src,
146 size = zpci_get_max_write_size((u64 __force) src,
149 rc = zpci_read_single(dst, src, size);
159 static inline int zpci_memcpy_toio(volatile void __iomem *dst,
160 const void *src, unsigned long n)
168 size = zpci_get_max_write_size((u64 __force) dst,
170 ZPCI_MAX_WRITE_SIZE);
171 if (size > 8) /* main path */
172 rc = zpci_write_block(dst, src, size);
174 rc = zpci_write_single(dst, src, size);
184 static inline int zpci_memset_io(volatile void __iomem *dst,
185 unsigned char val, size_t count)
187 u8 *src = kmalloc(count, GFP_KERNEL);
192 memset(src, val, count);
194 rc = zpci_memcpy_toio(dst, src, count);
199 #endif /* CONFIG_PCI */
201 #endif /* _ASM_S390_PCI_IO_H */