/* 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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