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Message-ID: <20240906114151.519028-5-jvetter@kalrayinc.com>
Date: Fri, 6 Sep 2024 13:41:51 +0200
From: Julian Vetter <jvetter@...rayinc.com>
To: Arnd Bergmann <arnd@...db.de>, Catalin Marinas
<catalin.marinas@....com>, Will Deacon <will@...nel.org>, Guo Ren
<guoren@...nel.org>, Huacai Chen <chenhuacai@...nel.org>, WANG Xuerui
<kernel@...0n.name>, Andrew Morton <akpm@...ux-foundation.org>
Cc: linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
linux-csky@...r.kernel.org, loongarch@...ts.linux.dev, Yann Sionneau
<ysionneau@...rayinc.com>, Julian Vetter <jvetter@...rayinc.com>
Subject: [PATCH 4/4] Activate GENERIC_IO for the loongarch architecture
Use the generic __memcpy_{from,to}io and __memset_io for the loongarch
processor architecture.
Reviewed-by: Yann Sionneau <ysionneau@...rayinc.com>
Signed-off-by: Julian Vetter <jvetter@...rayinc.com>
---
arch/loongarch/Kconfig | 1 +
arch/loongarch/kernel/Makefile | 2 +-
arch/loongarch/kernel/io.c | 94 ----------------------------------
3 files changed, 2 insertions(+), 95 deletions(-)
delete mode 100644 arch/loongarch/kernel/io.c
diff --git a/arch/loongarch/Kconfig b/arch/loongarch/Kconfig
index 70f169210b52..088137d75113 100644
--- a/arch/loongarch/Kconfig
+++ b/arch/loongarch/Kconfig
@@ -84,6 +84,7 @@ config LOONGARCH
select GENERIC_CPU_DEVICES
select GENERIC_ENTRY
select GENERIC_GETTIMEOFDAY
+ select GENERIC_IO
select GENERIC_IOREMAP if !ARCH_IOREMAP
select GENERIC_IRQ_MULTI_HANDLER
select GENERIC_IRQ_PROBE
diff --git a/arch/loongarch/kernel/Makefile b/arch/loongarch/kernel/Makefile
index c9bfeda89e40..9497968ee158 100644
--- a/arch/loongarch/kernel/Makefile
+++ b/arch/loongarch/kernel/Makefile
@@ -8,7 +8,7 @@ OBJECT_FILES_NON_STANDARD_head.o := y
extra-y := vmlinux.lds
obj-y += head.o cpu-probe.o cacheinfo.o env.o setup.o entry.o genex.o \
- traps.o irq.o idle.o process.o dma.o mem.o io.o reset.o switch.o \
+ traps.o irq.o idle.o process.o dma.o mem.o reset.o switch.o \
elf.o syscall.o signal.o time.o topology.o inst.o ptrace.o vdso.o \
alternative.o unwind.o
diff --git a/arch/loongarch/kernel/io.c b/arch/loongarch/kernel/io.c
deleted file mode 100644
index cb85bda5a6ad..000000000000
--- a/arch/loongarch/kernel/io.c
+++ /dev/null
@@ -1,94 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/*
- * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
- */
-#include <linux/export.h>
-#include <linux/types.h>
-#include <linux/io.h>
-
-/*
- * Copy data from IO memory space to "real" memory space.
- */
-void __memcpy_fromio(void *to, const volatile void __iomem *from, size_t count)
-{
- while (count && !IS_ALIGNED((unsigned long)from, 8)) {
- *(u8 *)to = __raw_readb(from);
- from++;
- to++;
- count--;
- }
-
- while (count >= 8) {
- *(u64 *)to = __raw_readq(from);
- from += 8;
- to += 8;
- count -= 8;
- }
-
- while (count) {
- *(u8 *)to = __raw_readb(from);
- from++;
- to++;
- count--;
- }
-}
-EXPORT_SYMBOL(__memcpy_fromio);
-
-/*
- * Copy data from "real" memory space to IO memory space.
- */
-void __memcpy_toio(volatile void __iomem *to, const void *from, size_t count)
-{
- while (count && !IS_ALIGNED((unsigned long)to, 8)) {
- __raw_writeb(*(u8 *)from, to);
- from++;
- to++;
- count--;
- }
-
- while (count >= 8) {
- __raw_writeq(*(u64 *)from, to);
- from += 8;
- to += 8;
- count -= 8;
- }
-
- while (count) {
- __raw_writeb(*(u8 *)from, to);
- from++;
- to++;
- count--;
- }
-}
-EXPORT_SYMBOL(__memcpy_toio);
-
-/*
- * "memset" on IO memory space.
- */
-void __memset_io(volatile void __iomem *dst, int c, size_t count)
-{
- u64 qc = (u8)c;
-
- qc |= qc << 8;
- qc |= qc << 16;
- qc |= qc << 32;
-
- while (count && !IS_ALIGNED((unsigned long)dst, 8)) {
- __raw_writeb(c, dst);
- dst++;
- count--;
- }
-
- while (count >= 8) {
- __raw_writeq(qc, dst);
- dst += 8;
- count -= 8;
- }
-
- while (count) {
- __raw_writeb(c, dst);
- dst++;
- count--;
- }
-}
-EXPORT_SYMBOL(__memset_io);
--
2.34.1
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