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https://github.com/Fishwaldo/Star64_linux.git
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8f28ca6bd8
Patch series "iomap: Constify ioreadX() iomem argument", v3. The ioread8/16/32() and others have inconsistent interface among the architectures: some taking address as const, some not. It seems there is nothing really stopping all of them to take pointer to const. This patch (of 4): The ioreadX() and ioreadX_rep() helpers have inconsistent interface. On some architectures void *__iomem address argument is a pointer to const, on some not. Implementations of ioreadX() do not modify the memory under the address so they can be converted to a "const" version for const-safety and consistency among architectures. [krzk@kernel.org: sh: clk: fix assignment from incompatible pointer type for ioreadX()] Link: http://lkml.kernel.org/r/20200723082017.24053-1-krzk@kernel.org [akpm@linux-foundation.org: fix drivers/mailbox/bcm-pdc-mailbox.c] Link: http://lkml.kernel.org/r/202007132209.Rxmv4QyS%25lkp@intel.com Suggested-by: Geert Uytterhoeven <geert@linux-m68k.org> Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be> Reviewed-by: Arnd Bergmann <arnd@arndb.de> Cc: Richard Henderson <rth@twiddle.net> Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru> Cc: Matt Turner <mattst88@gmail.com> Cc: "James E.J. Bottomley" <James.Bottomley@HansenPartnership.com> Cc: Helge Deller <deller@gmx.de> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Yoshinori Sato <ysato@users.sourceforge.jp> Cc: Rich Felker <dalias@libc.org> Cc: Kalle Valo <kvalo@codeaurora.org> Cc: "David S. Miller" <davem@davemloft.net> Cc: Jakub Kicinski <kuba@kernel.org> Cc: Dave Jiang <dave.jiang@intel.com> Cc: Jon Mason <jdmason@kudzu.us> Cc: Allen Hubbe <allenbh@gmail.com> Cc: "Michael S. Tsirkin" <mst@redhat.com> Cc: Jason Wang <jasowang@redhat.com> Link: http://lkml.kernel.org/r/20200709072837.5869-1-krzk@kernel.org Link: http://lkml.kernel.org/r/20200709072837.5869-2-krzk@kernel.org Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
132 lines
3.1 KiB
C
132 lines
3.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/* Trivial implementations of basic i/o routines. Assumes that all
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of the hard work has been done by ioremap and ioportmap, and that
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access to i/o space is linear. */
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/* This file may be included multiple times. */
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#if IO_CONCAT(__IO_PREFIX,trivial_io_bw)
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__EXTERN_INLINE unsigned int
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IO_CONCAT(__IO_PREFIX,ioread8)(const void __iomem *a)
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{
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return __kernel_ldbu(*(const volatile u8 __force *)a);
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}
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__EXTERN_INLINE unsigned int
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IO_CONCAT(__IO_PREFIX,ioread16)(const void __iomem *a)
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{
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return __kernel_ldwu(*(const volatile u16 __force *)a);
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}
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__EXTERN_INLINE void
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IO_CONCAT(__IO_PREFIX,iowrite8)(u8 b, void __iomem *a)
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{
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__kernel_stb(b, *(volatile u8 __force *)a);
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}
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__EXTERN_INLINE void
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IO_CONCAT(__IO_PREFIX,iowrite16)(u16 b, void __iomem *a)
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{
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__kernel_stw(b, *(volatile u16 __force *)a);
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}
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#endif
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#if IO_CONCAT(__IO_PREFIX,trivial_io_lq)
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__EXTERN_INLINE unsigned int
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IO_CONCAT(__IO_PREFIX,ioread32)(const void __iomem *a)
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{
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return *(const volatile u32 __force *)a;
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}
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__EXTERN_INLINE void
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IO_CONCAT(__IO_PREFIX,iowrite32)(u32 b, void __iomem *a)
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{
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*(volatile u32 __force *)a = b;
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}
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#endif
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#if IO_CONCAT(__IO_PREFIX,trivial_rw_bw) == 1
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__EXTERN_INLINE u8
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IO_CONCAT(__IO_PREFIX,readb)(const volatile void __iomem *a)
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{
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return __kernel_ldbu(*(const volatile u8 __force *)a);
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}
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__EXTERN_INLINE u16
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IO_CONCAT(__IO_PREFIX,readw)(const volatile void __iomem *a)
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{
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return __kernel_ldwu(*(const volatile u16 __force *)a);
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}
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__EXTERN_INLINE void
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IO_CONCAT(__IO_PREFIX,writeb)(u8 b, volatile void __iomem *a)
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{
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__kernel_stb(b, *(volatile u8 __force *)a);
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}
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__EXTERN_INLINE void
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IO_CONCAT(__IO_PREFIX,writew)(u16 b, volatile void __iomem *a)
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{
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__kernel_stw(b, *(volatile u16 __force *)a);
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}
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#elif IO_CONCAT(__IO_PREFIX,trivial_rw_bw) == 2
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__EXTERN_INLINE u8
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IO_CONCAT(__IO_PREFIX,readb)(const volatile void __iomem *a)
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{
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const void __iomem *addr = (const void __iomem *)a;
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return IO_CONCAT(__IO_PREFIX,ioread8)(addr);
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}
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__EXTERN_INLINE u16
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IO_CONCAT(__IO_PREFIX,readw)(const volatile void __iomem *a)
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{
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const void __iomem *addr = (const void __iomem *)a;
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return IO_CONCAT(__IO_PREFIX,ioread16)(addr);
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}
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__EXTERN_INLINE void
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IO_CONCAT(__IO_PREFIX,writeb)(u8 b, volatile void __iomem *a)
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{
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void __iomem *addr = (void __iomem *)a;
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IO_CONCAT(__IO_PREFIX,iowrite8)(b, addr);
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}
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__EXTERN_INLINE void
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IO_CONCAT(__IO_PREFIX,writew)(u16 b, volatile void __iomem *a)
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{
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void __iomem *addr = (void __iomem *)a;
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IO_CONCAT(__IO_PREFIX,iowrite16)(b, addr);
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}
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#endif
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#if IO_CONCAT(__IO_PREFIX,trivial_rw_lq) == 1
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__EXTERN_INLINE u32
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IO_CONCAT(__IO_PREFIX,readl)(const volatile void __iomem *a)
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{
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return *(const volatile u32 __force *)a;
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}
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__EXTERN_INLINE u64
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IO_CONCAT(__IO_PREFIX,readq)(const volatile void __iomem *a)
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{
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return *(const volatile u64 __force *)a;
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}
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__EXTERN_INLINE void
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IO_CONCAT(__IO_PREFIX,writel)(u32 b, volatile void __iomem *a)
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{
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*(volatile u32 __force *)a = b;
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}
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__EXTERN_INLINE void
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IO_CONCAT(__IO_PREFIX,writeq)(u64 b, volatile void __iomem *a)
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{
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*(volatile u64 __force *)a = b;
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}
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#endif
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#if IO_CONCAT(__IO_PREFIX,trivial_iounmap)
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__EXTERN_INLINE void IO_CONCAT(__IO_PREFIX,iounmap)(volatile void __iomem *a)
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{
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}
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#endif
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