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From:   Jisheng Zhang <jszhang@kernel.org>
To:     Paul Walmsley <paul.walmsley@sifive.com>,
        Palmer Dabbelt <palmer@dabbelt.com>,
        Albert Ou <aou@eecs.berkeley.edu>
Cc:     linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org
Subject: [PATCH] riscv: Use asm-generic for {read,write}{bwlq} and their relaxed variant
Date:   Thu, 23 Nov 2023 22:20:03 +0800
Message-Id: <20231123142003.1759-1-jszhang@kernel.org>
MIME-Version: 1.0
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Precedence: bulk

The asm-generic implementation is functionally identical to the riscv
version.

Signed-off-by: Jisheng Zhang <jszhang@kernel.org>
---
 arch/riscv/include/asm/mmio.h | 62 +----------------------------------
 1 file changed, 1 insertion(+), 61 deletions(-)

diff --git a/arch/riscv/include/asm/mmio.h b/arch/riscv/include/asm/mmio.h
index 4c58ee7f95ec..a491590593ca 100644
--- a/arch/riscv/include/asm/mmio.h
+++ b/arch/riscv/include/asm/mmio.h
@@ -80,54 +80,7 @@ static inline u64 __raw_readq(const volatile void __iomem *addr)
 #endif
 
 /*
- * Unordered I/O memory access primitives.  These are even more relaxed than
- * the relaxed versions, as they don't even order accesses between successive
- * operations to the I/O regions.
- */
-#define readb_cpu(c)		({ u8  __r = __raw_readb(c); __r; })
-#define readw_cpu(c)		({ u16 __r = le16_to_cpu((__force __le16)__raw_readw(c)); __r; })
-#define readl_cpu(c)		({ u32 __r = le32_to_cpu((__force __le32)__raw_readl(c)); __r; })
-
-#define writeb_cpu(v, c)	((void)__raw_writeb((v), (c)))
-#define writew_cpu(v, c)	((void)__raw_writew((__force u16)cpu_to_le16(v), (c)))
-#define writel_cpu(v, c)	((void)__raw_writel((__force u32)cpu_to_le32(v), (c)))
-
-#ifdef CONFIG_64BIT
-#define readq_cpu(c)		({ u64 __r = le64_to_cpu((__force __le64)__raw_readq(c)); __r; })
-#define writeq_cpu(v, c)	((void)__raw_writeq((__force u64)cpu_to_le64(v), (c)))
-#endif
-
-/*
- * Relaxed I/O memory access primitives. These follow the Device memory
- * ordering rules but do not guarantee any ordering relative to Normal memory
- * accesses.  These are defined to order the indicated access (either a read or
- * write) with all other I/O memory accesses to the same peripheral. Since the
- * platform specification defines that all I/O regions are strongly ordered on
- * channel 0, no explicit fences are required to enforce this ordering.
- */
-/* FIXME: These are now the same as asm-generic */
-#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)	({ u8  __v; __io_rbr(); __v = readb_cpu(c); __io_rar(); __v; })
-#define readw_relaxed(c)	({ u16 __v; __io_rbr(); __v = readw_cpu(c); __io_rar(); __v; })
-#define readl_relaxed(c)	({ u32 __v; __io_rbr(); __v = readl_cpu(c); __io_rar(); __v; })
-
-#define writeb_relaxed(v, c)	({ __io_rbw(); writeb_cpu((v), (c)); __io_raw(); })
-#define writew_relaxed(v, c)	({ __io_rbw(); writew_cpu((v), (c)); __io_raw(); })
-#define writel_relaxed(v, c)	({ __io_rbw(); writel_cpu((v), (c)); __io_raw(); })
-
-#ifdef CONFIG_64BIT
-#define readq_relaxed(c)	({ u64 __v; __io_rbr(); __v = readq_cpu(c); __io_rar(); __v; })
-#define writeq_relaxed(v, c)	({ __io_rbw(); writeq_cpu((v), (c)); __io_raw(); })
-#endif
-
-/*
- * I/O memory access primitives.  Reads are ordered relative to any following
- * Normal memory read and delay() loop.  Writes are ordered relative to any
- * prior Normal memory write.  The memory barriers here are necessary as RISC-V
+ * I/O barriers. The memory barriers here are necessary as RISC-V
  * doesn't define any ordering between the memory space and the I/O space.
  */
 #define __io_br()	do {} while (0)
@@ -135,17 +88,4 @@ static inline u64 __raw_readq(const volatile void __iomem *addr)
 #define __io_bw()	({ __asm__ __volatile__ ("fence w,o" : : : "memory"); })
 #define __io_aw()	mmiowb_set_pending()
 
-#define readb(c)	({ u8  __v; __io_br(); __v = readb_cpu(c); __io_ar(__v); __v; })
-#define readw(c)	({ u16 __v; __io_br(); __v = readw_cpu(c); __io_ar(__v); __v; })
-#define readl(c)	({ u32 __v; __io_br(); __v = readl_cpu(c); __io_ar(__v); __v; })
-
-#define writeb(v, c)	({ __io_bw(); writeb_cpu((v), (c)); __io_aw(); })
-#define writew(v, c)	({ __io_bw(); writew_cpu((v), (c)); __io_aw(); })
-#define writel(v, c)	({ __io_bw(); writel_cpu((v), (c)); __io_aw(); })
-
-#ifdef CONFIG_64BIT
-#define readq(c)	({ u64 __v; __io_br(); __v = readq_cpu(c); __io_ar(__v); __v; })
-#define writeq(v, c)	({ __io_bw(); writeq_cpu((v), (c)); __io_aw(); })
-#endif
-
 #endif /* _ASM_RISCV_MMIO_H */
-- 
2.42.0