/* SPDX-License-Identifier: GPL-2.0-only */
/*
 * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
 */

#ifndef _ASM_ARC_IO_H
#define _ASM_ARC_IO_H

#include <linux/types.h>
#include <asm/byteorder.h>
#include <asm/page.h>
#include <linux/unaligned.h>

#ifdef CONFIG_ISA_ARCV2
#include <asm/barrier.h>
#define __iormb()               rmb()
#define __iowmb()               wmb()
#else
#define __iormb()               do { } while (0)
#define __iowmb()               do { } while (0)
#endif

extern void __iomem *ioremap(phys_addr_t paddr, unsigned long size);
#define ioremap ioremap
#define ioremap_prot ioremap_prot
#define iounmap iounmap
static inline void __iomem *ioport_map(unsigned long port, unsigned int nr)
{
        return (void __iomem *)port;
}

static inline void ioport_unmap(void __iomem *addr)
{
}

/*
 * io{read,write}{16,32}be() macros
 */
#define ioread16be(p)           ({ u16 __v = be16_to_cpu((__force __be16)__raw_readw(p)); __iormb(); __v; })
#define ioread32be(p)           ({ u32 __v = be32_to_cpu((__force __be32)__raw_readl(p)); __iormb(); __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 __raw_readb __raw_readb
static inline u8 __raw_readb(const volatile void __iomem *addr)
{
        u8 b;

        __asm__ __volatile__(
        "       ldb%U1 %0, %1   \n"
        : "=r" (b)
        : "m" (*(volatile u8 __force *)addr)
        : "memory");

        return b;
}

#define __raw_readw __raw_readw
static inline u16 __raw_readw(const volatile void __iomem *addr)
{
        u16 s;

        __asm__ __volatile__(
        "       ldw%U1 %0, %1   \n"
        : "=r" (s)
        : "m" (*(volatile u16 __force *)addr)
        : "memory");

        return s;
}

#define __raw_readl __raw_readl
static inline u32 __raw_readl(const volatile void __iomem *addr)
{
        u32 w;

        __asm__ __volatile__(
        "       ld%U1 %0, %1    \n"
        : "=r" (w)
        : "m" (*(volatile u32 __force *)addr)
        : "memory");

        return w;
}

/*
 * {read,write}s{b,w,l}() repeatedly access the same IO address in
 * native endianness in 8-, 16-, 32-bit chunks {into,from} memory,
 * @count times
 */
#define __raw_readsx(t,f) \
static inline void __raw_reads##f(const volatile void __iomem *addr,    \
                                  void *ptr, unsigned int count)        \
{                                                                       \
        bool is_aligned = ((unsigned long)ptr % ((t) / 8)) == 0;        \
        u##t *buf = ptr;                                                \
                                                                        \
        if (!count)                                                     \
                return;                                                 \
                                                                        \
        /* Some ARC CPU's don't support unaligned accesses */           \
        if (is_aligned) {                                               \
                do {                                                    \
                        u##t x = __raw_read##f(addr);                   \
                        *buf++ = x;                                     \
                } while (--count);                                      \
        } else {                                                        \
                do {                                                    \
                        u##t x = __raw_read##f(addr);                   \
                        put_unaligned(x, buf++);                        \
                } while (--count);                                      \
        }                                                               \
}

#define __raw_readsb __raw_readsb
__raw_readsx(8, b)
#define __raw_readsw __raw_readsw
__raw_readsx(16, w)
#define __raw_readsl __raw_readsl
__raw_readsx(32, l)

#define __raw_writeb __raw_writeb
static inline void __raw_writeb(u8 b, volatile void __iomem *addr)
{
        __asm__ __volatile__(
        "       stb%U1 %0, %1   \n"
        :
        : "r" (b), "m" (*(volatile u8 __force *)addr)
        : "memory");
}

#define __raw_writew __raw_writew
static inline void __raw_writew(u16 s, volatile void __iomem *addr)
{
        __asm__ __volatile__(
        "       stw%U1 %0, %1   \n"
        :
        : "r" (s), "m" (*(volatile u16 __force *)addr)
        : "memory");

}

#define __raw_writel __raw_writel
static inline void __raw_writel(u32 w, volatile void __iomem *addr)
{
        __asm__ __volatile__(
        "       st%U1 %0, %1    \n"
        :
        : "r" (w), "m" (*(volatile u32 __force *)addr)
        : "memory");

}

#define __raw_writesx(t,f)                                              \
static inline void __raw_writes##f(volatile void __iomem *addr,         \
                                   const void *ptr, unsigned int count) \
{                                                                       \
        bool is_aligned = ((unsigned long)ptr % ((t) / 8)) == 0;        \
        const u##t *buf = ptr;                                          \
                                                                        \
        if (!count)                                                     \
                return;                                                 \
                                                                        \
        /* Some ARC CPU's don't support unaligned accesses */           \
        if (is_aligned) {                                               \
                do {                                                    \
                        __raw_write##f(*buf++, addr);                   \
                } while (--count);                                      \
        } else {                                                        \
                do {                                                    \
                        __raw_write##f(get_unaligned(buf++), addr);     \
                } while (--count);                                      \
        }                                                               \
}

#define __raw_writesb __raw_writesb
__raw_writesx(8, b)
#define __raw_writesw __raw_writesw
__raw_writesx(16, w)
#define __raw_writesl __raw_writesl
__raw_writesx(32, l)

/*
 * MMIO can also get buffered/optimized in micro-arch, so barriers needed
 * Based on ARM model for the typical use case
 *
 *      <ST [DMA buffer]>
 *      <writel MMIO "go" reg>
 *  or:
 *      <readl MMIO "status" reg>
 *      <LD [DMA buffer]>
 *
 * http://lkml.kernel.org/r/20150622133656.GG1583@arm.com
 */
#define readb(c)                ({ u8  __v = readb_relaxed(c); __iormb(); __v; })
#define readw(c)                ({ u16 __v = readw_relaxed(c); __iormb(); __v; })
#define readl(c)                ({ u32 __v = readl_relaxed(c); __iormb(); __v; })
#define readsb(p,d,l)           ({ __raw_readsb(p,d,l); __iormb(); })
#define readsw(p,d,l)           ({ __raw_readsw(p,d,l); __iormb(); })
#define readsl(p,d,l)           ({ __raw_readsl(p,d,l); __iormb(); })

#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 writesb(p,d,l)          ({ __iowmb(); __raw_writesb(p,d,l); })
#define writesw(p,d,l)          ({ __iowmb(); __raw_writesw(p,d,l); })
#define writesl(p,d,l)          ({ __iowmb(); __raw_writesl(p,d,l); })

/*
 * Relaxed API for drivers which can handle barrier ordering themselves
 *
 * Also these are defined to perform little endian accesses.
 * To provide the typical device register semantics of fixed endian,
 * swap the byte order for Big Endian
 *
 * http://lkml.kernel.org/r/201603100845.30602.arnd@arndb.de
 */
#define readb_relaxed(c)        __raw_readb(c)
#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 writeb_relaxed(v,c)     __raw_writeb(v,c)
#define writew_relaxed(v,c)     __raw_writew((__force u16) cpu_to_le16(v),c)
#define writel_relaxed(v,c)     __raw_writel((__force u32) cpu_to_le32(v),c)

#include <asm-generic/io.h>

#endif /* _ASM_ARC_IO_H */