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Message-Id: <1171212333.23147.10.camel@localhost>
Date: Sun, 11 Feb 2007 17:45:33 +0100
From: Martin Schwidefsky <schwidefsky@...ibm.com>
To: Al Viro <viro@....linux.org.uk>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>,
Tejun Heo <htejun@...il.com>,
Heiko Carstens <heiko.carstens@...ibm.com>,
Andrew Morton <akpm@...ux-foundation.org>,
Jeff Garzik <jgarzik@...ox.com>, linux-kernel@...r.kernel.org,
linux-s390@...r.kernel.org
Subject: Re: [PATCH] iomap: make PCI iomap stuff excluded when PCI isn't
configured
On Sat, 2007-02-10 at 23:55 +0000, Al Viro wrote:
> FWIW, the current picture wrt io-related stuff looks so:
>
> s390: no ioport_map, no ioread*/iowrite*, no port IO except for (in|out)b(_p|)
s390 does not even need (in|out)b(_p|). I wondered what else from io.h
do we not need. The answer is: almost nothing. With the devres patch
from Al and the dma-mapping patch from Heiko we can get rid of iomem and
all associated definitions.
--
blue skies,
Martin.
Martin Schwidefsky
Linux for zSeries Development & Services
IBM Deutschland Entwicklung GmbH
"Reality continues to ruin my life." - Calvin.
--
From: Martin Schwidefsky <schwidefsky@...ibm.com>
[S390] cleanup io.h
Remove code to access I/O memory. There is no such thing on s390.
Signed-off-by: Martin Schwidefsky <schwidefsky@...ibm.com>
---
arch/s390/Kconfig | 3 ++
arch/s390/mm/Makefile | 2 -
arch/s390/mm/ioremap.c | 58 --------------------------------------------
include/asm-s390/io.h | 64 -------------------------------------------------
4 files changed, 5 insertions(+), 122 deletions(-)
diff -urpN linux-2.6/arch/s390/Kconfig linux-2.6-patched/arch/s390/Kconfig
--- linux-2.6/arch/s390/Kconfig 2007-02-11 17:24:37.000000000 +0100
+++ linux-2.6-patched/arch/s390/Kconfig 2007-02-11 17:25:30.000000000 +0100
@@ -40,6 +40,9 @@ config GENERIC_TIME
config NO_IOPORT
def_bool y
+config NO_IOMEM
+ def_bool y
+
mainmenu "Linux Kernel Configuration"
config S390
diff -urpN linux-2.6/arch/s390/mm/ioremap.c linux-2.6-patched/arch/s390/mm/ioremap.c
--- linux-2.6/arch/s390/mm/ioremap.c 2006-12-09 21:08:18.000000000 +0100
+++ linux-2.6-patched/arch/s390/mm/ioremap.c 1970-01-01 01:00:00.000000000 +0100
@@ -1,58 +0,0 @@
-/*
- * arch/s390/mm/ioremap.c
- *
- * S390 version
- * Copyright (C) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation
- * Author(s): Hartmut Penner (hp@...ibm.com)
- *
- * Derived from "arch/i386/mm/extable.c"
- * (C) Copyright 1995 1996 Linus Torvalds
- *
- * Re-map IO memory to kernel address space so that we can access it.
- * This is needed for high PCI addresses that aren't mapped in the
- * 640k-1MB IO memory area on PC's
- */
-
-#include <linux/vmalloc.h>
-#include <linux/mm.h>
-#include <linux/io.h>
-#include <asm/pgalloc.h>
-
-/*
- * Generic mapping function (not visible outside):
- */
-
-/*
- * Remap an arbitrary physical address space into the kernel virtual
- * address space. Needed when the kernel wants to access high addresses
- * directly.
- */
-void * __ioremap(unsigned long phys_addr, unsigned long size, unsigned long flags)
-{
- void * addr;
- struct vm_struct * area;
-
- if (phys_addr < virt_to_phys(high_memory))
- return phys_to_virt(phys_addr);
- if (phys_addr & ~PAGE_MASK)
- return NULL;
- size = PAGE_ALIGN(size);
- if (!size || size > phys_addr + size)
- return NULL;
- area = get_vm_area(size, VM_IOREMAP);
- if (!area)
- return NULL;
- addr = area->addr;
- if (ioremap_page_range((unsigned long)addr, (unsigned long)addr + size,
- phys_addr, __pgprot(flags))) {
- vfree(addr);
- return NULL;
- }
- return addr;
-}
-
-void iounmap(void *addr)
-{
- if (addr > high_memory)
- vfree(addr);
-}
diff -urpN linux-2.6/arch/s390/mm/Makefile linux-2.6-patched/arch/s390/mm/Makefile
--- linux-2.6/arch/s390/mm/Makefile 2006-12-09 21:08:18.000000000 +0100
+++ linux-2.6-patched/arch/s390/mm/Makefile 2007-02-11 17:23:02.000000000 +0100
@@ -2,6 +2,6 @@
# Makefile for the linux s390-specific parts of the memory manager.
#
-obj-y := init.o fault.o ioremap.o extmem.o mmap.o vmem.o
+obj-y := init.o fault.o extmem.o mmap.o vmem.o
obj-$(CONFIG_CMM) += cmm.o
diff -urpN linux-2.6/include/asm-s390/io.h linux-2.6-patched/include/asm-s390/io.h
--- linux-2.6/include/asm-s390/io.h 2007-02-07 15:42:46.000000000 +0100
+++ linux-2.6-patched/include/asm-s390/io.h 2007-02-11 17:19:32.000000000 +0100
@@ -18,8 +18,6 @@
#define IO_SPACE_LIMIT 0xffffffff
-#define __io_virt(x) ((void *)(PAGE_OFFSET | (unsigned long)(x)))
-
/*
* Change virtual addresses to physical addresses and vv.
* These are pretty trivial
@@ -38,28 +36,9 @@ static inline unsigned long virt_to_phys
static inline void * phys_to_virt(unsigned long address)
{
- return __io_virt(address);
-}
-
-extern void * __ioremap(unsigned long offset, unsigned long size, unsigned long flags);
-
-static inline void * ioremap (unsigned long offset, unsigned long size)
-{
- return __ioremap(offset, size, 0);
-}
-
-/*
- * This one maps high address device memory and turns off caching for that area.
- * it's useful if some control registers are in such an area and write combining
- * or read caching is not desirable:
- */
-static inline void * ioremap_nocache (unsigned long offset, unsigned long size)
-{
- return __ioremap(offset, size, 0);
+ return (void *) address;
}
-extern void iounmap(void *addr);
-
/*
* IO bus memory addresses are also 1:1 with the physical address
*/
@@ -67,47 +46,6 @@ extern void iounmap(void *addr);
#define bus_to_virt phys_to_virt
/*
- * readX/writeX() are used to access memory mapped devices. On some
- * architectures the memory mapped IO stuff needs to be accessed
- * differently.
- */
-
-#define readb(addr) (*(volatile unsigned char *) __io_virt(addr))
-#define readw(addr) (*(volatile unsigned short *) __io_virt(addr))
-#define readl(addr) (*(volatile unsigned int *) __io_virt(addr))
-#define readq(addr) (*(volatile unsigned long long *) __io_virt(addr))
-
-#define readb_relaxed(addr) readb(addr)
-#define readw_relaxed(addr) readw(addr)
-#define readl_relaxed(addr) readl(addr)
-#define readq_relaxed(addr) readq(addr)
-#define __raw_readb readb
-#define __raw_readw readw
-#define __raw_readl readl
-#define __raw_readq readq
-
-#define writeb(b,addr) (*(volatile unsigned char *) __io_virt(addr) = (b))
-#define writew(b,addr) (*(volatile unsigned short *) __io_virt(addr) = (b))
-#define writel(b,addr) (*(volatile unsigned int *) __io_virt(addr) = (b))
-#define writeq(b,addr) (*(volatile unsigned long long *) __io_virt(addr) = (b))
-#define __raw_writeb writeb
-#define __raw_writew writew
-#define __raw_writel writel
-#define __raw_writeq writeq
-
-#define memset_io(a,b,c) memset(__io_virt(a),(b),(c))
-#define memcpy_fromio(a,b,c) memcpy((a),__io_virt(b),(c))
-#define memcpy_toio(a,b,c) memcpy(__io_virt(a),(b),(c))
-
-#define inb_p(addr) readb(addr)
-#define inb(addr) readb(addr)
-
-#define outb(x,addr) ((void) writeb(x,addr))
-#define outb_p(x,addr) outb(x,addr)
-
-#define mmiowb() do { } while (0)
-
-/*
* Convert a physical pointer to a virtual kernel pointer for /dev/mem
* access
*/
-
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