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Diffstat (limited to 'arch/arm64/include/asm/io.h')
| -rw-r--r-- | arch/arm64/include/asm/io.h | 185 |
1 files changed, 185 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/io.h b/arch/arm64/include/asm/io.h new file mode 100644 index 000000000..3b694511b --- /dev/null +++ b/arch/arm64/include/asm/io.h @@ -0,0 +1,185 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * Based on arch/arm/include/asm/io.h + * + * Copyright (C) 1996-2000 Russell King + * Copyright (C) 2012 ARM Ltd. + */ +#ifndef __ASM_IO_H +#define __ASM_IO_H + +#include <linux/types.h> +#include <linux/pgtable.h> + +#include <asm/byteorder.h> +#include <asm/barrier.h> +#include <asm/memory.h> +#include <asm/early_ioremap.h> +#include <asm/alternative.h> +#include <asm/cpufeature.h> + +/* + * Generic IO read/write. These perform native-endian accesses. + */ +#define __raw_writeb __raw_writeb +static __always_inline void __raw_writeb(u8 val, volatile void __iomem *addr) +{ + asm volatile("strb %w0, [%1]" : : "rZ" (val), "r" (addr)); +} + +#define __raw_writew __raw_writew +static __always_inline void __raw_writew(u16 val, volatile void __iomem *addr) +{ + asm volatile("strh %w0, [%1]" : : "rZ" (val), "r" (addr)); +} + +#define __raw_writel __raw_writel +static __always_inline void __raw_writel(u32 val, volatile void __iomem *addr) +{ + asm volatile("str %w0, [%1]" : : "rZ" (val), "r" (addr)); +} + +#define __raw_writeq __raw_writeq +static __always_inline void __raw_writeq(u64 val, volatile void __iomem *addr) +{ + asm volatile("str %x0, [%1]" : : "rZ" (val), "r" (addr)); +} + +#define __raw_readb __raw_readb +static __always_inline u8 __raw_readb(const volatile void __iomem *addr) +{ + u8 val; + asm volatile(ALTERNATIVE("ldrb %w0, [%1]", + "ldarb %w0, [%1]", + ARM64_WORKAROUND_DEVICE_LOAD_ACQUIRE) + : "=r" (val) : "r" (addr)); + return val; +} + +#define __raw_readw __raw_readw +static __always_inline u16 __raw_readw(const volatile void __iomem *addr) +{ + u16 val; + + asm volatile(ALTERNATIVE("ldrh %w0, [%1]", + "ldarh %w0, [%1]", + ARM64_WORKAROUND_DEVICE_LOAD_ACQUIRE) + : "=r" (val) : "r" (addr)); + return val; +} + +#define __raw_readl __raw_readl +static __always_inline u32 __raw_readl(const volatile void __iomem *addr) +{ + u32 val; + asm volatile(ALTERNATIVE("ldr %w0, [%1]", + "ldar %w0, [%1]", + ARM64_WORKAROUND_DEVICE_LOAD_ACQUIRE) + : "=r" (val) : "r" (addr)); + return val; +} + +#define __raw_readq __raw_readq +static __always_inline u64 __raw_readq(const volatile void __iomem *addr) +{ + u64 val; + asm volatile(ALTERNATIVE("ldr %0, [%1]", + "ldar %0, [%1]", + ARM64_WORKAROUND_DEVICE_LOAD_ACQUIRE) + : "=r" (val) : "r" (addr)); + return val; +} + +/* IO barriers */ +#define __io_ar(v) \ +({ \ + unsigned long tmp; \ + \ + dma_rmb(); \ + \ + /* \ + * Create a dummy control dependency from the IO read to any \ + * later instructions. This ensures that a subsequent call to \ + * udelay() will be ordered due to the ISB in get_cycles(). \ + */ \ + asm volatile("eor %0, %1, %1\n" \ + "cbnz %0, ." \ + : "=r" (tmp) : "r" ((unsigned long)(v)) \ + : "memory"); \ +}) + +#define __io_bw() dma_wmb() +#define __io_br(v) +#define __io_aw(v) + +/* arm64-specific, don't use in portable drivers */ +#define __iormb(v) __io_ar(v) +#define __iowmb() __io_bw() +#define __iomb() dma_mb() + +/* + * I/O port access primitives. + */ +#define arch_has_dev_port() (1) +#define IO_SPACE_LIMIT (PCI_IO_SIZE - 1) +#define PCI_IOBASE ((void __iomem *)PCI_IO_START) + +/* + * String version of I/O memory access operations. + */ +extern void __memcpy_fromio(void *, const volatile void __iomem *, size_t); +extern void __memcpy_toio(volatile void __iomem *, const void *, size_t); +extern void __memset_io(volatile void __iomem *, int, size_t); + +#define memset_io(c,v,l) __memset_io((c),(v),(l)) +#define memcpy_fromio(a,c,l) __memcpy_fromio((a),(c),(l)) +#define memcpy_toio(c,a,l) __memcpy_toio((c),(a),(l)) + +/* + * I/O memory mapping functions. + */ + +#define ioremap_prot ioremap_prot + +#define _PAGE_IOREMAP PROT_DEVICE_nGnRE + +#define ioremap_wc(addr, size) \ + ioremap_prot((addr), (size), PROT_NORMAL_NC) +#define ioremap_np(addr, size) \ + ioremap_prot((addr), (size), PROT_DEVICE_nGnRnE) + +/* + * io{read,write}{16,32,64}be() macros + */ +#define ioread16be(p) ({ __u16 __v = be16_to_cpu((__force __be16)__raw_readw(p)); __iormb(__v); __v; }) +#define ioread32be(p) ({ __u32 __v = be32_to_cpu((__force __be32)__raw_readl(p)); __iormb(__v); __v; }) +#define ioread64be(p) ({ __u64 __v = be64_to_cpu((__force __be64)__raw_readq(p)); __iormb(__v); __v; }) + +#define iowrite16be(v,p) ({ __iowmb(); __raw_writew((__force __u16)cpu_to_be16(v), p); }) +#define iowrite32be(v,p) ({ __iowmb(); __raw_writel((__force __u32)cpu_to_be32(v), p); }) +#define iowrite64be(v,p) ({ __iowmb(); __raw_writeq((__force __u64)cpu_to_be64(v), p); }) + +#include <asm-generic/io.h> + +#define ioremap_cache ioremap_cache +static inline void __iomem *ioremap_cache(phys_addr_t addr, size_t size) +{ + if (pfn_is_map_memory(__phys_to_pfn(addr))) + return (void __iomem *)__phys_to_virt(addr); + + return ioremap_prot(addr, size, PROT_NORMAL); +} + +/* + * More restrictive address range checking than the default implementation + * (PHYS_OFFSET and PHYS_MASK taken into account). + */ +#define ARCH_HAS_VALID_PHYS_ADDR_RANGE +extern int valid_phys_addr_range(phys_addr_t addr, size_t size); +extern int valid_mmap_phys_addr_range(unsigned long pfn, size_t size); + +extern bool arch_memremap_can_ram_remap(resource_size_t offset, size_t size, + unsigned long flags); +#define arch_memremap_can_ram_remap arch_memremap_can_ram_remap + +#endif /* __ASM_IO_H */ |