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/*
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (c) 2019 Western Digital Corporation or its affiliates.
*
* Authors:
* Anup Patel <[email protected]>
*/
#ifndef __RISCV_IO_H__
#define __RISCV_IO_H__
static inline uint32_t __raw_hartid(void)
{
extern int boot_hartid;
return boot_hartid;
}
static inline void __raw_writeb(rt_uint8_t val, volatile void *addr)
{
asm volatile("sb %0, 0(%1)" : : "r"(val), "r"(addr));
}
static inline void __raw_writew(rt_uint16_t val, volatile void *addr)
{
asm volatile("sh %0, 0(%1)" : : "r"(val), "r"(addr));
}
static inline void __raw_writel(rt_uint32_t val, volatile void *addr)
{
asm volatile("sw %0, 0(%1)" : : "r"(val), "r"(addr));
}
#if __riscv_xlen != 32
static inline void __raw_writeq(rt_uint64_t val, volatile void *addr)
{
asm volatile("sd %0, 0(%1)" : : "r"(val), "r"(addr));
}
#endif
static inline rt_uint8_t __raw_readb(const volatile void *addr)
{
rt_uint8_t val;
asm volatile("lb %0, 0(%1)" : "=r"(val) : "r"(addr));
return val;
}
static inline rt_uint16_t __raw_readw(const volatile void *addr)
{
rt_uint16_t val;
asm volatile("lh %0, 0(%1)" : "=r"(val) : "r"(addr));
return val;
}
static inline rt_uint32_t __raw_readl(const volatile void *addr)
{
rt_uint32_t val;
asm volatile("lw %0, 0(%1)" : "=r"(val) : "r"(addr));
return val;
}
#if __riscv_xlen != 32
static inline rt_uint64_t __raw_readq(const volatile void *addr)
{
rt_uint64_t val;
asm volatile("ld %0, 0(%1)" : "=r"(val) : "r"(addr));
return val;
}
#endif
/* FIXME: These are now the same as asm-generic */
/* clang-format off */
#define __io_rbr() do {} while (0)
#define __io_rar() do {} while (0)
#define __io_rbw() do {} while (0)
#define __io_raw() do {} while (0)
#define readb_relaxed(c) ({ rt_uint8_t __v; __io_rbr(); __v = __raw_readb(c); __io_rar(); __v; })
#define readw_relaxed(c) ({ rt_uint16_t __v; __io_rbr(); __v = __raw_readw(c); __io_rar(); __v; })
#define readl_relaxed(c) ({ rt_uint32_t __v; __io_rbr(); __v = __raw_readl(c); __io_rar(); __v; })
#define writeb_relaxed(v,c) ({ __io_rbw(); __raw_writeb((v),(c)); __io_raw(); })
#define writew_relaxed(v,c) ({ __io_rbw(); __raw_writew((v),(c)); __io_raw(); })
#define writel_relaxed(v,c) ({ __io_rbw(); __raw_writel((v),(c)); __io_raw(); })
#if __riscv_xlen != 32
#define readq_relaxed(c) ({ rt_uint64_t __v; __io_rbr(); __v = __raw_readq(c); __io_rar(); __v; })
#define writeq_relaxed(v,c) ({ __io_rbw(); __raw_writeq((v),(c)); __io_raw(); })
#endif
#define __io_br() do {} while (0)
#define __io_ar() __asm__ __volatile__ ("fence i,r" : : : "memory");
#define __io_bw() __asm__ __volatile__ ("fence w,o" : : : "memory");
#define __io_aw() do {} while (0)
#define readb(c) ({ rt_uint8_t __v; __io_br(); __v = __raw_readb(c); __io_ar(); __v; })
#define readw(c) ({ rt_uint16_t __v; __io_br(); __v = __raw_readw(c); __io_ar(); __v; })
#define readl(c) ({ rt_uint32_t __v; __io_br(); __v = __raw_readl(c); __io_ar(); __v; })
#define writeb(v,c) ({ __io_bw(); __raw_writeb((v),(c)); __io_aw(); })
#define writew(v,c) ({ __io_bw(); __raw_writew((v),(c)); __io_aw(); })
#define writel(v,c) ({ __io_bw(); __raw_writel((v),(c)); __io_aw(); })
#if __riscv_xlen != 32
#define readq(c) ({ rt_uint64_t __v; __io_br(); __v = __raw_readq(c); __io_ar(); __v; })
#define writeq(v,c) ({ __io_bw(); __raw_writeq((v),(c)); __io_aw(); })
#endif
#endif
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