233 lines
7.7 KiB
C
233 lines
7.7 KiB
C
/*
|
|
* 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 */
|