diff options
Diffstat (limited to 'arch/s390/include/asm/pci_io.h')
| -rw-r--r-- | arch/s390/include/asm/pci_io.h | 206 |
1 files changed, 206 insertions, 0 deletions
diff --git a/arch/s390/include/asm/pci_io.h b/arch/s390/include/asm/pci_io.h new file mode 100644 index 000000000..cbb9cb9c6 --- /dev/null +++ b/arch/s390/include/asm/pci_io.h @@ -0,0 +1,206 @@ +/* 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 */ |