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linux/arch/alpha/include/asm/io_trivial.h
Arnd Bergmann e19d4ebc53 alpha: add full ioread64/iowrite64 implementation
The previous patch introduced ioread64/iowrite64 declarations, but
this means we no longer get the io-64-nonatomic variant, and
run into a long error when someone actually wants to use these:

ERROR: modpost: "ioread64" [drivers/net/ethernet/freescale/enetc/fsl-enetc.ko] undefined!

Add the (hopefully) correct implementation for each machine type,
based on the 32-bit accessor. Since the 32-bit return type does
not work for ioread64(), change the internal implementation to use
the correct width consistently, but leave the external interface
to match the asm-generic/iomap.h header that uses 32-bit or 64-bit
return values.

Reported-by: Guenter Roeck <linux@roeck-us.net>
Tested-by: Guenter Roeck <linux@roeck-us.net>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Fixes: 7e772dad99 ("alpha: Use generic <asm-generic/io.h>")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
2022-10-04 11:23:29 +02:00

145 lines
3.3 KiB
C

/* SPDX-License-Identifier: GPL-2.0 */
/* Trivial implementations of basic i/o routines. Assumes that all
of the hard work has been done by ioremap and ioportmap, and that
access to i/o space is linear. */
/* This file may be included multiple times. */
#if IO_CONCAT(__IO_PREFIX,trivial_io_bw)
__EXTERN_INLINE u8
IO_CONCAT(__IO_PREFIX,ioread8)(const void __iomem *a)
{
return __kernel_ldbu(*(const volatile u8 __force *)a);
}
__EXTERN_INLINE u16
IO_CONCAT(__IO_PREFIX,ioread16)(const void __iomem *a)
{
return __kernel_ldwu(*(const volatile u16 __force *)a);
}
__EXTERN_INLINE void
IO_CONCAT(__IO_PREFIX,iowrite8)(u8 b, void __iomem *a)
{
__kernel_stb(b, *(volatile u8 __force *)a);
}
__EXTERN_INLINE void
IO_CONCAT(__IO_PREFIX,iowrite16)(u16 b, void __iomem *a)
{
__kernel_stw(b, *(volatile u16 __force *)a);
}
#endif
#if IO_CONCAT(__IO_PREFIX,trivial_io_lq)
__EXTERN_INLINE u32
IO_CONCAT(__IO_PREFIX,ioread32)(const void __iomem *a)
{
return *(const volatile u32 __force *)a;
}
__EXTERN_INLINE void
IO_CONCAT(__IO_PREFIX,iowrite32)(u32 b, void __iomem *a)
{
*(volatile u32 __force *)a = b;
}
__EXTERN_INLINE u64
IO_CONCAT(__IO_PREFIX,ioread64)(const void __iomem *a)
{
return *(const volatile u64 __force *)a;
}
__EXTERN_INLINE void
IO_CONCAT(__IO_PREFIX,iowrite64)(u64 b, void __iomem *a)
{
*(volatile u64 __force *)a = b;
}
#endif
#if IO_CONCAT(__IO_PREFIX,trivial_rw_bw) == 1
__EXTERN_INLINE u8
IO_CONCAT(__IO_PREFIX,readb)(const volatile void __iomem *a)
{
return __kernel_ldbu(*(const volatile u8 __force *)a);
}
__EXTERN_INLINE u16
IO_CONCAT(__IO_PREFIX,readw)(const volatile void __iomem *a)
{
return __kernel_ldwu(*(const volatile u16 __force *)a);
}
__EXTERN_INLINE void
IO_CONCAT(__IO_PREFIX,writeb)(u8 b, volatile void __iomem *a)
{
__kernel_stb(b, *(volatile u8 __force *)a);
}
__EXTERN_INLINE void
IO_CONCAT(__IO_PREFIX,writew)(u16 b, volatile void __iomem *a)
{
__kernel_stw(b, *(volatile u16 __force *)a);
}
#elif IO_CONCAT(__IO_PREFIX,trivial_rw_bw) == 2
__EXTERN_INLINE u8
IO_CONCAT(__IO_PREFIX,readb)(const volatile void __iomem *a)
{
const void __iomem *addr = (const void __iomem *)a;
return IO_CONCAT(__IO_PREFIX,ioread8)(addr);
}
__EXTERN_INLINE u16
IO_CONCAT(__IO_PREFIX,readw)(const volatile void __iomem *a)
{
const void __iomem *addr = (const void __iomem *)a;
return IO_CONCAT(__IO_PREFIX,ioread16)(addr);
}
__EXTERN_INLINE void
IO_CONCAT(__IO_PREFIX,writeb)(u8 b, volatile void __iomem *a)
{
void __iomem *addr = (void __iomem *)a;
IO_CONCAT(__IO_PREFIX,iowrite8)(b, addr);
}
__EXTERN_INLINE void
IO_CONCAT(__IO_PREFIX,writew)(u16 b, volatile void __iomem *a)
{
void __iomem *addr = (void __iomem *)a;
IO_CONCAT(__IO_PREFIX,iowrite16)(b, addr);
}
#endif
#if IO_CONCAT(__IO_PREFIX,trivial_rw_lq) == 1
__EXTERN_INLINE u32
IO_CONCAT(__IO_PREFIX,readl)(const volatile void __iomem *a)
{
return *(const volatile u32 __force *)a;
}
__EXTERN_INLINE u64
IO_CONCAT(__IO_PREFIX,readq)(const volatile void __iomem *a)
{
return *(const volatile u64 __force *)a;
}
__EXTERN_INLINE void
IO_CONCAT(__IO_PREFIX,writel)(u32 b, volatile void __iomem *a)
{
*(volatile u32 __force *)a = b;
}
__EXTERN_INLINE void
IO_CONCAT(__IO_PREFIX,writeq)(u64 b, volatile void __iomem *a)
{
*(volatile u64 __force *)a = b;
}
#endif
#if IO_CONCAT(__IO_PREFIX,trivial_iounmap)
__EXTERN_INLINE void IO_CONCAT(__IO_PREFIX,iounmap)(volatile void __iomem *a)
{
}
#endif