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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_S390_PCI_IO_H
#define _ASM_S390_PCI_IO_H
#ifdef CONFIG_PCI
#include <linux/kernel.h>
#include <linux/slab.h>
#include <asm/pci_insn.h>
/* I/O Map */
#define ZPCI_IOMAP_SHIFT 48
#define ZPCI_IOMAP_ADDR_BASE 0x8000000000000000UL
#define ZPCI_IOMAP_ADDR_OFF_MASK ((1UL << ZPCI_IOMAP_SHIFT) - 1)
#define ZPCI_IOMAP_MAX_ENTRIES \
((ULONG_MAX - ZPCI_IOMAP_ADDR_BASE + 1) / (1UL << ZPCI_IOMAP_SHIFT))
#define ZPCI_IOMAP_ADDR_IDX_MASK \
(~ZPCI_IOMAP_ADDR_OFF_MASK - ZPCI_IOMAP_ADDR_BASE)
struct zpci_iomap_entry {
u32 fh;
u8 bar;
u16 count;
};
extern struct zpci_iomap_entry *zpci_iomap_start;
#define ZPCI_ADDR(idx) (ZPCI_IOMAP_ADDR_BASE | ((u64) idx << ZPCI_IOMAP_SHIFT))
#define ZPCI_IDX(addr) \
(((__force u64) addr & ZPCI_IOMAP_ADDR_IDX_MASK) >> ZPCI_IOMAP_SHIFT)
#define ZPCI_OFFSET(addr) \
((__force u64) addr & ZPCI_IOMAP_ADDR_OFF_MASK)
#define ZPCI_CREATE_REQ(handle, space, len) \
((u64) handle << 32 | space << 16 | len)
#define zpci_read(LENGTH, RETTYPE) \
static inline RETTYPE zpci_read_##RETTYPE(const volatile void __iomem *addr) \
{ \
struct zpci_iomap_entry *entry = &zpci_iomap_start[ZPCI_IDX(addr)]; \
u64 req = ZPCI_CREATE_REQ(entry->fh, entry->bar, LENGTH); \
u64 data; \
int rc; \
\
rc = zpci_load(&data, req, ZPCI_OFFSET(addr)); \
if (rc) \
data = -1ULL; \
return (RETTYPE) data; \
}
#define zpci_write(LENGTH, VALTYPE) \
static inline void zpci_write_##VALTYPE(VALTYPE val, \
const volatile void __iomem *addr) \
{ \
struct zpci_iomap_entry *entry = &zpci_iomap_start[ZPCI_IDX(addr)]; \
u64 req = ZPCI_CREATE_REQ(entry->fh, entry->bar, LENGTH); \
u64 data = (VALTYPE) val; \
\
zpci_store(data, req, ZPCI_OFFSET(addr)); \
}
zpci_read(8, u64)
zpci_read(4, u32)
zpci_read(2, u16)
zpci_read(1, u8)
zpci_write(8, u64)
zpci_write(4, u32)
zpci_write(2, u16)
zpci_write(1, u8)
static inline int zpci_write_single(u64 req, const u64 *data, u64 offset, u8 len)
{
u64 val;
switch (len) {
case 1:
val = (u64) *((u8 *) data);
break;
case 2:
val = (u64) *((u16 *) data);
break;
case 4:
val = (u64) *((u32 *) data);
break;
case 8:
val = (u64) *((u64 *) data);
break;
default:
val = 0; /* let FW report error */
break;
}
return zpci_store(val, req, offset);
}
static inline int zpci_read_single(u64 req, u64 *dst, u64 offset, u8 len)
{
u64 data;
int cc;
cc = zpci_load(&data, req, offset);
if (cc)
goto out;
switch (len) {
case 1:
*((u8 *) dst) = (u8) data;
break;
case 2:
*((u16 *) dst) = (u16) data;
break;
case 4:
*((u32 *) dst) = (u32) data;
break;
case 8:
*((u64 *) dst) = (u64) data;
break;
}
out:
return cc;
}
static inline int zpci_write_block(u64 req, const u64 *data, u64 offset)
{
return zpci_store_block(data, req, offset);
}
static inline u8 zpci_get_max_write_size(u64 src, u64 dst, int len, int max)
{
int count = len > max ? max : len, size = 1;
while (!(src & 0x1) && !(dst & 0x1) && ((size << 1) <= count)) {
dst = dst >> 1;
src = src >> 1;
size = size << 1;
}
return size;
}
static inline int zpci_memcpy_fromio(void *dst,
const volatile void __iomem *src,
unsigned long n)
{
struct zpci_iomap_entry *entry = &zpci_iomap_start[ZPCI_IDX(src)];
u64 req, offset = ZPCI_OFFSET(src);
int size, rc = 0;
while (n > 0) {
size = zpci_get_max_write_size((u64 __force) src,
(u64) dst, n, 8);
req = ZPCI_CREATE_REQ(entry->fh, entry->bar, size);
rc = zpci_read_single(req, dst, offset, size);
if (rc)
break;
offset += size;
dst += size;
n -= size;
}
return rc;
}
static inline int zpci_memcpy_toio(volatile void __iomem *dst,
const void *src, unsigned long n)
{
struct zpci_iomap_entry *entry = &zpci_iomap_start[ZPCI_IDX(dst)];
u64 req, offset = ZPCI_OFFSET(dst);
int size, rc = 0;
if (!src)
return -EINVAL;
while (n > 0) {
size = zpci_get_max_write_size((u64 __force) dst,
(u64) src, n, 128);
req = ZPCI_CREATE_REQ(entry->fh, entry->bar, size);
if (size > 8) /* main path */
rc = zpci_write_block(req, src, offset);
else
rc = zpci_write_single(req, src, offset, size);
if (rc)
break;
offset += size;
src += size;
n -= size;
}
return rc;
}
static inline int zpci_memset_io(volatile void __iomem *dst,
unsigned char val, size_t count)
{
u8 *src = kmalloc(count, GFP_KERNEL);
int rc;
if (src == NULL)
return -ENOMEM;
memset(src, val, count);
rc = zpci_memcpy_toio(dst, src, count);
kfree(src);
return rc;
}
#endif /* CONFIG_PCI */
#endif /* _ASM_S390_PCI_IO_H */
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