[PATCH v5 2/4] mips: add <asm-generic/io.h> including

[PATCH v5 2/4] mips: add <asm-generic/io.h> including

[Baoquan He]

From: Jiaxun Yang <jiaxun.yang@flygoat.com>

With the adding, some default ioremap_xx methods defined in
asm-generic/io.h can be used. E.g the default ioremap_uc() returning
NULL.

We also massaged various headers to avoid nested includes.

Signed-off-by: Baoquan He <bhe@redhat.com>
Signed-off-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
[jiaxun.yang@flygoat.com: Massage more headers, fix ioport defines]
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Cc: Huacai Chen <chenhuacai@kernel.org>
Cc: linux-mips@vger.kernel.org
Cc: linux-arch@vger.kernel.org
---
 arch/mips/include/asm/io.h      | 96 +++++++++++++++++++++++----------
 arch/mips/include/asm/mmiowb.h  |  4 +-
 arch/mips/include/asm/smp-ops.h |  2 -
 arch/mips/include/asm/smp.h     |  4 +-
 arch/mips/kernel/setup.c        |  1 +
 arch/mips/pci/pci-ip27.c        |  3 ++
 6 files changed, 75 insertions(+), 35 deletions(-)

diff --git a/arch/mips/include/asm/io.h b/arch/mips/include/asm/io.h
index 062dd4e6b954..41d8bd5adef8 100644
--- a/arch/mips/include/asm/io.h
+++ b/arch/mips/include/asm/io.h
@@ -13,7 +13,6 @@
 #define _ASM_IO_H
 
 #include <linux/compiler.h>
-#include <linux/kernel.h>
 #include <linux/types.h>
 #include <linux/irqflags.h>
 
@@ -25,7 +24,6 @@
 #include <asm/cpu-features.h>
 #include <asm/page.h>
 #include <asm/pgtable-bits.h>
-#include <asm/processor.h>
 #include <asm/string.h>
 #include <mangle-port.h>
 
@@ -41,6 +39,11 @@
 # define __raw_ioswabq(a, x)	(x)
 # define ____raw_ioswabq(a, x)	(x)
 
+# define _ioswabb ioswabb
+# define _ioswabw ioswabw
+# define _ioswabl ioswabl
+# define _ioswabq ioswabq
+
 # define __relaxed_ioswabb ioswabb
 # define __relaxed_ioswabw ioswabw
 # define __relaxed_ioswabl ioswabl
@@ -126,6 +129,7 @@ static inline phys_addr_t virt_to_phys(const volatile void *x)
  *     almost all conceivable cases a device driver should not be using
  *     this function
  */
+#define phys_to_virt phys_to_virt
 static inline void * phys_to_virt(unsigned long address)
 {
 	return __va(address);
@@ -296,9 +300,9 @@ static inline type pfx##read##bwlq(const volatile void __iomem *mem)	\
 	return pfx##ioswab##bwlq(__mem, __val);				\
 }
 
-#define __BUILD_IOPORT_SINGLE(pfx, bwlq, type, barrier, relax, p)	\
+#define __BUILD_IOPORT_SINGLE(pfx, bwlq, type, barrier, relax)		\
 									\
-static inline void pfx##out##bwlq##p(type val, unsigned long port)	\
+static inline void pfx##out##bwlq(type val, unsigned long port)		\
 {									\
 	volatile type *__addr;						\
 	type __val;							\
@@ -318,7 +322,7 @@ static inline void pfx##out##bwlq##p(type val, unsigned long port)	\
 	*__addr = __val;						\
 }									\
 									\
-static inline type pfx##in##bwlq##p(unsigned long port)			\
+static inline type pfx##in##bwlq(unsigned long port)			\
 {									\
 	volatile type *__addr;						\
 	type __val;							\
@@ -360,11 +364,10 @@ __BUILD_MEMORY_PFX(__mem_, q, u64, 0)
 #endif
 
 #define __BUILD_IOPORT_PFX(bus, bwlq, type)				\
-	__BUILD_IOPORT_SINGLE(bus, bwlq, type, 1, 0,)			\
-	__BUILD_IOPORT_SINGLE(bus, bwlq, type, 1, 0, _p)
+	__BUILD_IOPORT_SINGLE(bus, bwlq, type, 1, 0)
 
 #define BUILDIO_IOPORT(bwlq, type)					\
-	__BUILD_IOPORT_PFX(, bwlq, type)				\
+	__BUILD_IOPORT_PFX(_, bwlq, type)				\
 	__BUILD_IOPORT_PFX(__mem_, bwlq, type)
 
 BUILDIO_IOPORT(b, u8)
@@ -412,14 +415,6 @@ __BUILDIO(q, u64)
 #define writeq_be(val, addr)						\
 	__raw_writeq(cpu_to_be64((val)), (__force unsigned *)(addr))
 
-/*
- * Some code tests for these symbols
- */
-#ifdef CONFIG_64BIT
-#define readq				readq
-#define writeq				writeq
-#endif
-
 #define __BUILD_MEMORY_STRING(bwlq, type)				\
 									\
 static inline void writes##bwlq(volatile void __iomem *mem,		\
@@ -480,18 +475,6 @@ BUILDSTRING(l, u32)
 BUILDSTRING(q, u64)
 #endif
 
-static inline void memset_io(volatile void __iomem *addr, unsigned char val, int count)
-{
-	memset((void __force *) addr, val, count);
-}
-static inline void memcpy_fromio(void *dst, const volatile void __iomem *src, int count)
-{
-	memcpy(dst, (void __force *) src, count);
-}
-static inline void memcpy_toio(volatile void __iomem *dst, const void *src, int count)
-{
-	memcpy((void __force *) dst, src, count);
-}
 
 /*
  * The caches on some architectures aren't dma-coherent and have need to
@@ -548,6 +531,61 @@ extern void (*_dma_cache_inv)(unsigned long start, unsigned long size);
 #define csr_out32(v, a) (*(volatile u32 *)((unsigned long)(a) + __CSR_32_ADJUST) = (v))
 #define csr_in32(a)    (*(volatile u32 *)((unsigned long)(a) + __CSR_32_ADJUST))
 
+
+#define __raw_readb __raw_readb
+#define __raw_readw __raw_readw
+#define __raw_readl __raw_readl
+#ifdef CONFIG_64BIT
+#define __raw_readq __raw_readq
+#endif
+#define __raw_writeb __raw_writeb
+#define __raw_writew __raw_writew
+#define __raw_writel __raw_writel
+#ifdef CONFIG_64BIT
+#define __raw_writeq __raw_writeq
+#endif
+
+#define readb readb
+#define readw readw
+#define readl readl
+#ifdef CONFIG_64BIT
+#define readq readq
+#endif
+#define writeb writeb
+#define writew writew
+#define writel writel
+#ifdef CONFIG_64BIT
+#define writeq writeq
+#endif
+
+#define readsb readsb
+#define readsw readsw
+#define readsl readsl
+#ifdef CONFIG_64BIT
+#define readsq readsq
+#endif
+#define writesb writesb
+#define writesw writesw
+#define writesl writesl
+#ifdef CONFIG_64BIT
+#define writesq writesq
+#endif
+
+#define _inb _inb
+#define _inw _inw
+#define _inl _inl
+#define insb insb
+#define insw insw
+#define insl insl
+
+#define _outb _outb
+#define _outw _outw
+#define _outl _outl
+#define outsb outsb
+#define outsw outsw
+#define outsl outsl
+
+
 /*
  * Convert a physical pointer to a virtual kernel pointer for /dev/mem
  * access
@@ -557,4 +595,6 @@ extern void (*_dma_cache_inv)(unsigned long start, unsigned long size);
 
 void __ioread64_copy(void *to, const void __iomem *from, size_t count);
 
+#include <asm-generic/io.h>
+
 #endif /* _ASM_IO_H */
diff --git a/arch/mips/include/asm/mmiowb.h b/arch/mips/include/asm/mmiowb.h
index a40824e3ef8e..cf27752fd220 100644
--- a/arch/mips/include/asm/mmiowb.h
+++ b/arch/mips/include/asm/mmiowb.h
@@ -2,9 +2,9 @@
 #ifndef _ASM_MMIOWB_H
 #define _ASM_MMIOWB_H
 
-#include <asm/io.h>
+#include <asm/barrier.h>
 
-#define mmiowb()	iobarrier_w()
+#define mmiowb()	wmb()
 
 #include <asm-generic/mmiowb.h>
 
diff --git a/arch/mips/include/asm/smp-ops.h b/arch/mips/include/asm/smp-ops.h
index 5719ff49eff1..a6941b7f0cc0 100644
--- a/arch/mips/include/asm/smp-ops.h
+++ b/arch/mips/include/asm/smp-ops.h
@@ -13,8 +13,6 @@
 
 #include <linux/errno.h>
 
-#include <asm/mips-cps.h>
-
 #ifdef CONFIG_SMP
 
 #include <linux/cpumask.h>
diff --git a/arch/mips/include/asm/smp.h b/arch/mips/include/asm/smp.h
index a40d8c0e4b87..f3b18b4a5e44 100644
--- a/arch/mips/include/asm/smp.h
+++ b/arch/mips/include/asm/smp.h
@@ -11,13 +11,11 @@
 #ifndef __ASM_SMP_H
 #define __ASM_SMP_H
 
-#include <linux/bitops.h>
+#include <linux/compiler.h>
 #include <linux/linkage.h>
-#include <linux/smp.h>
 #include <linux/threads.h>
 #include <linux/cpumask.h>
 
-#include <linux/atomic.h>
 #include <asm/smp-ops.h>
 
 extern int smp_num_siblings;
diff --git a/arch/mips/kernel/setup.c b/arch/mips/kernel/setup.c
index cb871eb784a7..6939b27b1106 100644
--- a/arch/mips/kernel/setup.c
+++ b/arch/mips/kernel/setup.c
@@ -43,6 +43,7 @@
 #include <asm/sections.h>
 #include <asm/setup.h>
 #include <asm/smp-ops.h>
+#include <asm/mips-cps.h>
 #include <asm/prom.h>
 #include <asm/fw/fw.h>
 
diff --git a/arch/mips/pci/pci-ip27.c b/arch/mips/pci/pci-ip27.c
index d85cbf84e41c..973faea61cad 100644
--- a/arch/mips/pci/pci-ip27.c
+++ b/arch/mips/pci/pci-ip27.c
@@ -7,6 +7,9 @@
  * Copyright (C) 1999, 2000, 04 Ralf Baechle (ralf@linux-mips.org)
  * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
  */
+
+#include <linux/io.h>
+
 #include <asm/sn/addrs.h>
 #include <asm/sn/types.h>
 #include <asm/sn/klconfig.h>
-- 
2.41.0

[PATCH v5 3/4] arch/*/io.h: remove ioremap_uc in some architectures

[Baoquan He]

ioremap_uc() is only meaningful on old x86-32 systems with the PAT
extension, and on ia64 with its slightly unconventional ioremap()
behavior. So remove the ioremap_uc() definition in architecutures
other than x86 and ia64. These architectures all have asm-generic/io.h
included and will have the default ioremap_uc() definition which
returns NULL.

This changes the existing behaviour, while no need to worry about
any breakage because in the only callsite of ioremap_uc(), code
has been adjusted to eliminate the impact. Please see
atyfb_setup_generic() of drivers/video/fbdev/aty/atyfb_base.c.

If any new invocation of ioremap_uc() need be added, please consider
using ioremap() intead or adding a ARCH specific version if necessary.

Signed-off-by: Baoquan He <bhe@redhat.com>
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
Acked-by: Michael Ellerman <mpe@ellerman.id.au> (powerpc)
Acked-by: Helge Deller <deller@gmx.de>  # parisc
Cc: linux-alpha@vger.kernel.org
Cc: linux-hexagon@vger.kernel.org
Cc: linux-m68k@lists.linux-m68k.org
Cc: linux-mips@vger.kernel.org
Cc: linux-parisc@vger.kernel.org
Cc: linuxppc-dev@lists.ozlabs.org
Cc: linux-sh@vger.kernel.org
Cc: sparclinux@vger.kernel.org
---
 Documentation/driver-api/device-io.rst | 9 +++++----
 arch/alpha/include/asm/io.h            | 1 -
 arch/hexagon/include/asm/io.h          | 3 ---
 arch/m68k/include/asm/kmap.h           | 1 -
 arch/mips/include/asm/io.h             | 1 -
 arch/parisc/include/asm/io.h           | 2 --
 arch/powerpc/include/asm/io.h          | 1 -
 arch/sh/include/asm/io.h               | 2 --
 arch/sparc/include/asm/io_64.h         | 1 -
 9 files changed, 5 insertions(+), 16 deletions(-)

diff --git a/Documentation/driver-api/device-io.rst b/Documentation/driver-api/device-io.rst
index 2c7abd234f4e..d55384b106bd 100644
--- a/Documentation/driver-api/device-io.rst
+++ b/Documentation/driver-api/device-io.rst
@@ -408,11 +408,12 @@ functions for details on the CPU side of things.
 ioremap_uc()
 ------------
 
-ioremap_uc() behaves like ioremap() except that on the x86 architecture without
-'PAT' mode, it marks memory as uncached even when the MTRR has designated
-it as cacheable, see Documentation/arch/x86/pat.rst.
+ioremap_uc() is only meaningful on old x86-32 systems with the PAT extension,
+and on ia64 with its slightly unconventional ioremap() behavior, everywhere
+elss ioremap_uc() defaults to return NULL.
 
-Portable drivers should avoid the use of ioremap_uc().
+
+Portable drivers should avoid the use of ioremap_uc(), use ioremap() instead.
 
 ioremap_cache()
 ---------------
diff --git a/arch/alpha/include/asm/io.h b/arch/alpha/include/asm/io.h
index 7aeaf7c30a6f..076f0e4e7f1e 100644
--- a/arch/alpha/include/asm/io.h
+++ b/arch/alpha/include/asm/io.h
@@ -308,7 +308,6 @@ static inline void __iomem *ioremap(unsigned long port, unsigned long size)
 }
 
 #define ioremap_wc ioremap
-#define ioremap_uc ioremap
 
 static inline void iounmap(volatile void __iomem *addr)
 {
diff --git a/arch/hexagon/include/asm/io.h b/arch/hexagon/include/asm/io.h
index e2b308e32a37..b7bc246dbcb1 100644
--- a/arch/hexagon/include/asm/io.h
+++ b/arch/hexagon/include/asm/io.h
@@ -174,9 +174,6 @@ static inline void writel(u32 data, volatile void __iomem *addr)
 #define _PAGE_IOREMAP (_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \
 		       (__HEXAGON_C_DEV << 6))
 
-#define ioremap_uc(addr, size) ioremap((addr), (size))
-
-
 #define __raw_writel writel
 
 static inline void memcpy_fromio(void *dst, const volatile void __iomem *src,
diff --git a/arch/m68k/include/asm/kmap.h b/arch/m68k/include/asm/kmap.h
index 4efb3efa593a..b778f015c917 100644
--- a/arch/m68k/include/asm/kmap.h
+++ b/arch/m68k/include/asm/kmap.h
@@ -25,7 +25,6 @@ static inline void __iomem *ioremap(unsigned long physaddr, unsigned long size)
 	return __ioremap(physaddr, size, IOMAP_NOCACHE_SER);
 }
 
-#define ioremap_uc ioremap
 #define ioremap_wt ioremap_wt
 static inline void __iomem *ioremap_wt(unsigned long physaddr,
 				       unsigned long size)
diff --git a/arch/mips/include/asm/io.h b/arch/mips/include/asm/io.h
index 41d8bd5adef8..1ecf255efb40 100644
--- a/arch/mips/include/asm/io.h
+++ b/arch/mips/include/asm/io.h
@@ -170,7 +170,6 @@ void iounmap(const volatile void __iomem *addr);
  */
 #define ioremap(offset, size)						\
 	ioremap_prot((offset), (size), _CACHE_UNCACHED)
-#define ioremap_uc		ioremap
 
 /*
  * ioremap_cache -	map bus memory into CPU space
diff --git a/arch/parisc/include/asm/io.h b/arch/parisc/include/asm/io.h
index 366537042465..48630c78714a 100644
--- a/arch/parisc/include/asm/io.h
+++ b/arch/parisc/include/asm/io.h
@@ -132,8 +132,6 @@ static inline void gsc_writeq(unsigned long long val, unsigned long addr)
 
 #define ioremap_wc(addr, size)  \
 	ioremap_prot((addr), (size), _PAGE_IOREMAP)
-#define ioremap_uc(addr, size)  \
-	ioremap_prot((addr), (size), _PAGE_IOREMAP)
 
 #define pci_iounmap			pci_iounmap
 
diff --git a/arch/powerpc/include/asm/io.h b/arch/powerpc/include/asm/io.h
index 0732b743e099..21bd3e8bffce 100644
--- a/arch/powerpc/include/asm/io.h
+++ b/arch/powerpc/include/asm/io.h
@@ -900,7 +900,6 @@ void __iomem *ioremap_wt(phys_addr_t address, unsigned long size);
 #endif
 
 void __iomem *ioremap_coherent(phys_addr_t address, unsigned long size);
-#define ioremap_uc(addr, size)		ioremap((addr), (size))
 #define ioremap_cache(addr, size) \
 	ioremap_prot((addr), (size), pgprot_val(PAGE_KERNEL))
 
diff --git a/arch/sh/include/asm/io.h b/arch/sh/include/asm/io.h
index f2f38e9d489a..790bea22c9b5 100644
--- a/arch/sh/include/asm/io.h
+++ b/arch/sh/include/asm/io.h
@@ -302,8 +302,6 @@ unsigned long long poke_real_address_q(unsigned long long addr,
 	ioremap_prot((addr), (size), pgprot_val(PAGE_KERNEL))
 #endif /* CONFIG_MMU */
 
-#define ioremap_uc	ioremap
-
 /*
  * Convert a physical pointer to a virtual kernel pointer for /dev/mem
  * access
diff --git a/arch/sparc/include/asm/io_64.h b/arch/sparc/include/asm/io_64.h
index 9303270b22f3..d8ee1442f303 100644
--- a/arch/sparc/include/asm/io_64.h
+++ b/arch/sparc/include/asm/io_64.h
@@ -423,7 +423,6 @@ static inline void __iomem *ioremap(unsigned long offset, unsigned long size)
 	return (void __iomem *)offset;
 }
 
-#define ioremap_uc(X,Y)			ioremap((X),(Y))
 #define ioremap_wc(X,Y)			ioremap((X),(Y))
 #define ioremap_wt(X,Y)			ioremap((X),(Y))
 static inline void __iomem *ioremap_np(unsigned long offset, unsigned long size)
-- 
2.41.0

[PATCH v5 4/4] mips: io: remove duplicated codes

[Baoquan He]

By adding <asm-generic/io.h> support, the duplicated phys_to_virt
can be removed to use the default version in <asm-gneneric/io.h>.

Meanwhile move isa_bus_to_virt() down below <asm-generic/io.h> including
to fix the compiling error of missing phys_to_virt definition.

Signed-off-by: Baoquan He <bhe@redhat.com>
Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Helge Deller <deller@gmx.de>
Cc: Serge Semin <fancer.lancer@gmail.com>
Cc: Florian Fainelli <f.fainelli@gmail.com>
Cc: Huacai Chen <chenhuacai@kernel.org>
Cc: Jiaxun Yang <jiaxun.yang@flygoat.com>
Cc: linux-mips@vger.kernel.org
---
 arch/mips/include/asm/io.h | 28 +++++-----------------------
 1 file changed, 5 insertions(+), 23 deletions(-)

diff --git a/arch/mips/include/asm/io.h b/arch/mips/include/asm/io.h
index 1ecf255efb40..fe5476c1c689 100644
--- a/arch/mips/include/asm/io.h
+++ b/arch/mips/include/asm/io.h
@@ -117,24 +117,6 @@ static inline phys_addr_t virt_to_phys(const volatile void *x)
 	return __virt_to_phys(x);
 }
 
-/*
- *     phys_to_virt    -       map physical address to virtual
- *     @address: address to remap
- *
- *     The returned virtual address is a current CPU mapping for
- *     the memory address given. It is only valid to use this function on
- *     addresses that have a kernel mapping
- *
- *     This function does not handle bus mappings for DMA transfers. In
- *     almost all conceivable cases a device driver should not be using
- *     this function
- */
-#define phys_to_virt phys_to_virt
-static inline void * phys_to_virt(unsigned long address)
-{
-	return __va(address);
-}
-
 /*
  * ISA I/O bus memory addresses are 1:1 with the physical address.
  */
@@ -143,11 +125,6 @@ static inline unsigned long isa_virt_to_bus(volatile void *address)
 	return virt_to_phys(address);
 }
 
-static inline void *isa_bus_to_virt(unsigned long address)
-{
-	return phys_to_virt(address);
-}
-
 /*
  * Change "struct page" to physical address.
  */
@@ -596,4 +573,9 @@ void __ioread64_copy(void *to, const void __iomem *from, size_t count);
 
 #include <asm-generic/io.h>
 
+static inline void *isa_bus_to_virt(unsigned long address)
+{
+	return phys_to_virt(address);
+}
+
 #endif /* _ASM_IO_H */
-- 
2.41.0

Re: [PATCH v5 4/4] mips: io: remove duplicated codes

[Arnd Bergmann]

On Thu, Sep 21, 2023, at 07:04, Baoquan He wrote:
> By adding <asm-generic/io.h> support, the duplicated phys_to_virt
> can be removed to use the default version in <asm-gneneric/io.h>.
>
> Meanwhile move isa_bus_to_virt() down below <asm-generic/io.h> including
> to fix the compiling error of missing phys_to_virt definition.
>

Acked-by: Arnd Bergmann <arnd@arndb.de>

Re: [PATCH v5 3/4] arch/*/io.h: remove ioremap_uc in some architectures

[Arnd Bergmann]

On Thu, Sep 21, 2023, at 07:04, Baoquan He wrote:
> ioremap_uc() is only meaningful on old x86-32 systems with the PAT
> extension, and on ia64 with its slightly unconventional ioremap()
> behavior. So remove the ioremap_uc() definition in architecutures
> other than x86 and ia64. These architectures all have asm-generic/io.h
> included and will have the default ioremap_uc() definition which
> returns NULL.
>
> This changes the existing behaviour, while no need to worry about
> any breakage because in the only callsite of ioremap_uc(), code
> has been adjusted to eliminate the impact. Please see
> atyfb_setup_generic() of drivers/video/fbdev/aty/atyfb_base.c.
>
> If any new invocation of ioremap_uc() need be added, please consider
> using ioremap() intead or adding a ARCH specific version if necessary.
>
> Signed-off-by: Baoquan He <bhe@redhat.com>
> Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
> Acked-by: Michael Ellerman <mpe@ellerman.id.au> (powerpc)
> Acked-by: Helge Deller <deller@gmx.de>  # parisc
> Cc: linux-alpha@vger.kernel.org
> Cc: linux-hexagon@vger.kernel.org
> Cc: linux-m68k@lists.linux-m68k.org
> Cc: linux-mips@vger.kernel.org
> Cc: linux-parisc@vger.kernel.org
> Cc: linuxppc-dev@lists.ozlabs.org
> Cc: linux-sh@vger.kernel.org
> Cc: sparclinux@vger.kernel.org

Acked-by: Arnd Bergmann <arnd@arndb.de>

Re: [PATCH v5 2/4] mips: add <asm-generic/io.h> including

[Thomas Bogendoerfer]

On Thu, Sep 21, 2023 at 07:04:22PM +0800, Baoquan He wrote:
> From: Jiaxun Yang <jiaxun.yang@flygoat.com>
> 
> With the adding, some default ioremap_xx methods defined in
> asm-generic/io.h can be used. E.g the default ioremap_uc() returning
> NULL.
> 
> We also massaged various headers to avoid nested includes.
> 
> Signed-off-by: Baoquan He <bhe@redhat.com>
> Signed-off-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
> [jiaxun.yang@flygoat.com: Massage more headers, fix ioport defines]
> Reviewed-by: Arnd Bergmann <arnd@arndb.de>
> Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
> Cc: Huacai Chen <chenhuacai@kernel.org>
> Cc: linux-mips@vger.kernel.org
> Cc: linux-arch@vger.kernel.org
> ---
>  arch/mips/include/asm/io.h      | 96 +++++++++++++++++++++++----------
>  arch/mips/include/asm/mmiowb.h  |  4 +-
>  arch/mips/include/asm/smp-ops.h |  2 -
>  arch/mips/include/asm/smp.h     |  4 +-
>  arch/mips/kernel/setup.c        |  1 +
>  arch/mips/pci/pci-ip27.c        |  3 ++
>  6 files changed, 75 insertions(+), 35 deletions(-)

Acked-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>

-- 
Crap can work. Given enough thrust pigs will fly, but it's not necessarily a
good idea.                                                [ RFC1925, 2.3 ]

Re: [PATCH v5 3/4] arch/*/io.h: remove ioremap_uc in some architectures

[Thomas Bogendoerfer]

On Thu, Sep 21, 2023 at 07:04:23PM +0800, Baoquan He wrote:
> ioremap_uc() is only meaningful on old x86-32 systems with the PAT
> extension, and on ia64 with its slightly unconventional ioremap()
> behavior. So remove the ioremap_uc() definition in architecutures
> other than x86 and ia64. These architectures all have asm-generic/io.h
> included and will have the default ioremap_uc() definition which
> returns NULL.
> 
> This changes the existing behaviour, while no need to worry about
> any breakage because in the only callsite of ioremap_uc(), code
> has been adjusted to eliminate the impact. Please see
> atyfb_setup_generic() of drivers/video/fbdev/aty/atyfb_base.c.
> 
> If any new invocation of ioremap_uc() need be added, please consider
> using ioremap() intead or adding a ARCH specific version if necessary.
> 
> Signed-off-by: Baoquan He <bhe@redhat.com>
> Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
> Acked-by: Michael Ellerman <mpe@ellerman.id.au> (powerpc)
> Acked-by: Helge Deller <deller@gmx.de>  # parisc
> Cc: linux-alpha@vger.kernel.org
> Cc: linux-hexagon@vger.kernel.org
> Cc: linux-m68k@lists.linux-m68k.org
> Cc: linux-mips@vger.kernel.org
> Cc: linux-parisc@vger.kernel.org
> Cc: linuxppc-dev@lists.ozlabs.org
> Cc: linux-sh@vger.kernel.org
> Cc: sparclinux@vger.kernel.org
> ---
>  Documentation/driver-api/device-io.rst | 9 +++++----
>  arch/alpha/include/asm/io.h            | 1 -
>  arch/hexagon/include/asm/io.h          | 3 ---
>  arch/m68k/include/asm/kmap.h           | 1 -
>  arch/mips/include/asm/io.h             | 1 -

Acked-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>

-- 
Crap can work. Given enough thrust pigs will fly, but it's not necessarily a
good idea.                                                [ RFC1925, 2.3 ]

Re: [PATCH v5 4/4] mips: io: remove duplicated codes

[Thomas Bogendoerfer]

On Thu, Sep 21, 2023 at 07:04:24PM +0800, Baoquan He wrote:
> By adding <asm-generic/io.h> support, the duplicated phys_to_virt
> can be removed to use the default version in <asm-gneneric/io.h>.
> 
> Meanwhile move isa_bus_to_virt() down below <asm-generic/io.h> including
> to fix the compiling error of missing phys_to_virt definition.
> 
> Signed-off-by: Baoquan He <bhe@redhat.com>
> Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
> Cc: Geert Uytterhoeven <geert@linux-m68k.org>
> Cc: Helge Deller <deller@gmx.de>
> Cc: Serge Semin <fancer.lancer@gmail.com>
> Cc: Florian Fainelli <f.fainelli@gmail.com>
> Cc: Huacai Chen <chenhuacai@kernel.org>
> Cc: Jiaxun Yang <jiaxun.yang@flygoat.com>
> Cc: linux-mips@vger.kernel.org
> ---
>  arch/mips/include/asm/io.h | 28 +++++-----------------------
>  1 file changed, 5 insertions(+), 23 deletions(-)

Acked-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>

-- 
Crap can work. Given enough thrust pigs will fly, but it's not necessarily a
good idea.                                                [ RFC1925, 2.3 ]

Re: [PATCH v5 3/4] arch/*/io.h: remove ioremap_uc in some architectures

[John Paul Adrian Glaubitz]

On Thu, 2023-09-21 at 19:04 +0800, Baoquan He wrote:
> ioremap_uc() is only meaningful on old x86-32 systems with the PAT
> extension, and on ia64 with its slightly unconventional ioremap()
> behavior. So remove the ioremap_uc() definition in architecutures
> other than x86 and ia64. These architectures all have asm-generic/io.h
> included and will have the default ioremap_uc() definition which
> returns NULL.
> 
> This changes the existing behaviour, while no need to worry about
> any breakage because in the only callsite of ioremap_uc(), code
> has been adjusted to eliminate the impact. Please see
> atyfb_setup_generic() of drivers/video/fbdev/aty/atyfb_base.c.
> 
> If any new invocation of ioremap_uc() need be added, please consider
> using ioremap() intead or adding a ARCH specific version if necessary.
> 
> Signed-off-by: Baoquan He <bhe@redhat.com>
> Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
> Acked-by: Michael Ellerman <mpe@ellerman.id.au> (powerpc)
> Acked-by: Helge Deller <deller@gmx.de>  # parisc
> Cc: linux-alpha@vger.kernel.org
> Cc: linux-hexagon@vger.kernel.org
> Cc: linux-m68k@lists.linux-m68k.org
> Cc: linux-mips@vger.kernel.org
> Cc: linux-parisc@vger.kernel.org
> Cc: linuxppc-dev@lists.ozlabs.org
> Cc: linux-sh@vger.kernel.org
> Cc: sparclinux@vger.kernel.org
> ---
>  Documentation/driver-api/device-io.rst | 9 +++++----
>  arch/alpha/include/asm/io.h            | 1 -
>  arch/hexagon/include/asm/io.h          | 3 ---
>  arch/m68k/include/asm/kmap.h           | 1 -
>  arch/mips/include/asm/io.h             | 1 -
>  arch/parisc/include/asm/io.h           | 2 --
>  arch/powerpc/include/asm/io.h          | 1 -
>  arch/sh/include/asm/io.h               | 2 --
>  arch/sparc/include/asm/io_64.h         | 1 -
>  9 files changed, 5 insertions(+), 16 deletions(-)
> 
> diff --git a/Documentation/driver-api/device-io.rst b/Documentation/driver-api/device-io.rst
> index 2c7abd234f4e..d55384b106bd 100644
> --- a/Documentation/driver-api/device-io.rst
> +++ b/Documentation/driver-api/device-io.rst
> @@ -408,11 +408,12 @@ functions for details on the CPU side of things.
>  ioremap_uc()
>  ------------
>  
> -ioremap_uc() behaves like ioremap() except that on the x86 architecture without
> -'PAT' mode, it marks memory as uncached even when the MTRR has designated
> -it as cacheable, see Documentation/arch/x86/pat.rst.
> +ioremap_uc() is only meaningful on old x86-32 systems with the PAT extension,
> +and on ia64 with its slightly unconventional ioremap() behavior, everywhere
> +elss ioremap_uc() defaults to return NULL.
>  
> -Portable drivers should avoid the use of ioremap_uc().
> +
> +Portable drivers should avoid the use of ioremap_uc(), use ioremap() instead.
>  
>  ioremap_cache()
>  ---------------
> diff --git a/arch/alpha/include/asm/io.h b/arch/alpha/include/asm/io.h
> index 7aeaf7c30a6f..076f0e4e7f1e 100644
> --- a/arch/alpha/include/asm/io.h
> +++ b/arch/alpha/include/asm/io.h
> @@ -308,7 +308,6 @@ static inline void __iomem *ioremap(unsigned long port, unsigned long size)
>  }
>  
>  #define ioremap_wc ioremap
> -#define ioremap_uc ioremap
>  
>  static inline void iounmap(volatile void __iomem *addr)
>  {
> diff --git a/arch/hexagon/include/asm/io.h b/arch/hexagon/include/asm/io.h
> index e2b308e32a37..b7bc246dbcb1 100644
> --- a/arch/hexagon/include/asm/io.h
> +++ b/arch/hexagon/include/asm/io.h
> @@ -174,9 +174,6 @@ static inline void writel(u32 data, volatile void __iomem *addr)
>  #define _PAGE_IOREMAP (_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \
>  		       (__HEXAGON_C_DEV << 6))
>  
> -#define ioremap_uc(addr, size) ioremap((addr), (size))
> -
> -
>  #define __raw_writel writel
>  
>  static inline void memcpy_fromio(void *dst, const volatile void __iomem *src,
> diff --git a/arch/m68k/include/asm/kmap.h b/arch/m68k/include/asm/kmap.h
> index 4efb3efa593a..b778f015c917 100644
> --- a/arch/m68k/include/asm/kmap.h
> +++ b/arch/m68k/include/asm/kmap.h
> @@ -25,7 +25,6 @@ static inline void __iomem *ioremap(unsigned long physaddr, unsigned long size)
>  	return __ioremap(physaddr, size, IOMAP_NOCACHE_SER);
>  }
>  
> -#define ioremap_uc ioremap
>  #define ioremap_wt ioremap_wt
>  static inline void __iomem *ioremap_wt(unsigned long physaddr,
>  				       unsigned long size)
> diff --git a/arch/mips/include/asm/io.h b/arch/mips/include/asm/io.h
> index 41d8bd5adef8..1ecf255efb40 100644
> --- a/arch/mips/include/asm/io.h
> +++ b/arch/mips/include/asm/io.h
> @@ -170,7 +170,6 @@ void iounmap(const volatile void __iomem *addr);
>   */
>  #define ioremap(offset, size)						\
>  	ioremap_prot((offset), (size), _CACHE_UNCACHED)
> -#define ioremap_uc		ioremap
>  
>  /*
>   * ioremap_cache -	map bus memory into CPU space
> diff --git a/arch/parisc/include/asm/io.h b/arch/parisc/include/asm/io.h
> index 366537042465..48630c78714a 100644
> --- a/arch/parisc/include/asm/io.h
> +++ b/arch/parisc/include/asm/io.h
> @@ -132,8 +132,6 @@ static inline void gsc_writeq(unsigned long long val, unsigned long addr)
>  
>  #define ioremap_wc(addr, size)  \
>  	ioremap_prot((addr), (size), _PAGE_IOREMAP)
> -#define ioremap_uc(addr, size)  \
> -	ioremap_prot((addr), (size), _PAGE_IOREMAP)
>  
>  #define pci_iounmap			pci_iounmap
>  
> diff --git a/arch/powerpc/include/asm/io.h b/arch/powerpc/include/asm/io.h
> index 0732b743e099..21bd3e8bffce 100644
> --- a/arch/powerpc/include/asm/io.h
> +++ b/arch/powerpc/include/asm/io.h
> @@ -900,7 +900,6 @@ void __iomem *ioremap_wt(phys_addr_t address, unsigned long size);
>  #endif
>  
>  void __iomem *ioremap_coherent(phys_addr_t address, unsigned long size);
> -#define ioremap_uc(addr, size)		ioremap((addr), (size))
>  #define ioremap_cache(addr, size) \
>  	ioremap_prot((addr), (size), pgprot_val(PAGE_KERNEL))
>  
> diff --git a/arch/sh/include/asm/io.h b/arch/sh/include/asm/io.h
> index f2f38e9d489a..790bea22c9b5 100644
> --- a/arch/sh/include/asm/io.h
> +++ b/arch/sh/include/asm/io.h
> @@ -302,8 +302,6 @@ unsigned long long poke_real_address_q(unsigned long long addr,
>  	ioremap_prot((addr), (size), pgprot_val(PAGE_KERNEL))
>  #endif /* CONFIG_MMU */
>  
> -#define ioremap_uc	ioremap
> -
>  /*
>   * Convert a physical pointer to a virtual kernel pointer for /dev/mem
>   * access
> diff --git a/arch/sparc/include/asm/io_64.h b/arch/sparc/include/asm/io_64.h
> index 9303270b22f3..d8ee1442f303 100644
> --- a/arch/sparc/include/asm/io_64.h
> +++ b/arch/sparc/include/asm/io_64.h
> @@ -423,7 +423,6 @@ static inline void __iomem *ioremap(unsigned long offset, unsigned long size)
>  	return (void __iomem *)offset;
>  }
>  
> -#define ioremap_uc(X,Y)			ioremap((X),(Y))
>  #define ioremap_wc(X,Y)			ioremap((X),(Y))
>  #define ioremap_wt(X,Y)			ioremap((X),(Y))
>  static inline void __iomem *ioremap_np(unsigned long offset, unsigned long size)

Acked-by: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de> (SuperH)

-- 
 .''`.  John Paul Adrian Glaubitz
: :' :  Debian Developer
`. `'   Physicist
  `-    GPG: 62FF 8A75 84E0 2956 9546  0006 7426 3B37 F5B5 F913