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Diffstat (limited to '')
| -rw-r--r-- | arch/arm64/include/asm/io.h | 232 |
1 files changed, 232 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..49bb9a020 --- /dev/null +++ b/arch/arm64/include/asm/io.h @@ -0,0 +1,232 @@ +/* + * Based on arch/arm/include/asm/io.h + * + * Copyright (C) 1996-2000 Russell King + * Copyright (C) 2012 ARM Ltd. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + */ +#ifndef __ASM_IO_H +#define __ASM_IO_H + +#ifdef __KERNEL__ + +#include <linux/types.h> + +#include <asm/byteorder.h> +#include <asm/barrier.h> +#include <asm/memory.h> +#include <asm/pgtable.h> +#include <asm/early_ioremap.h> +#include <asm/alternative.h> +#include <asm/cpufeature.h> + +#include <xen/xen.h> + +/* + * Generic IO read/write. These perform native-endian accesses. + */ +#define __raw_writeb __raw_writeb +static 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 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 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 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 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 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 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 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 __iormb(v) \ +({ \ + unsigned long tmp; \ + \ + 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 __iowmb() wmb() + +#define mmiowb() do { } while (0) + +/* + * Relaxed I/O memory access primitives. These follow the Device memory + * ordering rules but do not guarantee any ordering relative to Normal memory + * accesses. + */ +#define readb_relaxed(c) ({ u8 __r = __raw_readb(c); __r; }) +#define readw_relaxed(c) ({ u16 __r = le16_to_cpu((__force __le16)__raw_readw(c)); __r; }) +#define readl_relaxed(c) ({ u32 __r = le32_to_cpu((__force __le32)__raw_readl(c)); __r; }) +#define readq_relaxed(c) ({ u64 __r = le64_to_cpu((__force __le64)__raw_readq(c)); __r; }) + +#define writeb_relaxed(v,c) ((void)__raw_writeb((v),(c))) +#define writew_relaxed(v,c) ((void)__raw_writew((__force u16)cpu_to_le16(v),(c))) +#define writel_relaxed(v,c) ((void)__raw_writel((__force u32)cpu_to_le32(v),(c))) +#define writeq_relaxed(v,c) ((void)__raw_writeq((__force u64)cpu_to_le64(v),(c))) + +/* + * I/O memory access primitives. Reads are ordered relative to any + * following Normal memory access. Writes are ordered relative to any prior + * Normal memory access. + */ +#define readb(c) ({ u8 __v = readb_relaxed(c); __iormb(__v); __v; }) +#define readw(c) ({ u16 __v = readw_relaxed(c); __iormb(__v); __v; }) +#define readl(c) ({ u32 __v = readl_relaxed(c); __iormb(__v); __v; }) +#define readq(c) ({ u64 __v = readq_relaxed(c); __iormb(__v); __v; }) + +#define writeb(v,c) ({ __iowmb(); writeb_relaxed((v),(c)); }) +#define writew(v,c) ({ __iowmb(); writew_relaxed((v),(c)); }) +#define writel(v,c) ({ __iowmb(); writel_relaxed((v),(c)); }) +#define writeq(v,c) ({ __iowmb(); writeq_relaxed((v),(c)); }) + +/* + * 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. + */ +extern void __iomem *__ioremap(phys_addr_t phys_addr, size_t size, pgprot_t prot); +extern void __iounmap(volatile void __iomem *addr); +extern void __iomem *ioremap_cache(phys_addr_t phys_addr, size_t size); + +#define ioremap(addr, size) __ioremap((addr), (size), __pgprot(PROT_DEVICE_nGnRE)) +#define ioremap_nocache(addr, size) __ioremap((addr), (size), __pgprot(PROT_DEVICE_nGnRE)) +#define ioremap_wc(addr, size) __ioremap((addr), (size), __pgprot(PROT_NORMAL_NC)) +#define ioremap_wt(addr, size) __ioremap((addr), (size), __pgprot(PROT_DEVICE_nGnRE)) +#define iounmap __iounmap + +/* + * PCI configuration space mapping function. + * + * The PCI specification disallows posted write configuration transactions. + * Add an arch specific pci_remap_cfgspace() definition that is implemented + * through nGnRnE device memory attribute as recommended by the ARM v8 + * Architecture reference manual Issue A.k B2.8.2 "Device memory". + */ +#define pci_remap_cfgspace(addr, size) __ioremap((addr), (size), __pgprot(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> + +/* + * 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 int devmem_is_allowed(unsigned long pfn); + +struct bio_vec; +extern bool xen_biovec_phys_mergeable(const struct bio_vec *vec1, + const struct bio_vec *vec2); +#define BIOVEC_PHYS_MERGEABLE(vec1, vec2) \ + (__BIOVEC_PHYS_MERGEABLE(vec1, vec2) && \ + (!xen_domain() || xen_biovec_phys_mergeable(vec1, vec2))) + +#endif /* __KERNEL__ */ +#endif /* __ASM_IO_H */ |