linux-kernel - Re: [PATCH 4/5] serial: convert early

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Message-ID: <86802c440705302134l637df0fbm9a3b99eff19201@mail.gmail.com>
Date:	Wed, 30 May 2007 21:34:35 -0700
From:	"Yinghai Lu" <yhlu.kernel@...il.com>
To:	"Andrew Morton" <akpm@...ux-foundation.org>
Cc:	"Andi Kleen" <ak@...e.de>, "Russell King" <rmk@....linux.org.uk>,
	"Bjorn Helgaas" <bjorn.helgaas@...com>,
	"Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 4/5] serial: convert early_uart to earlycon for 8250

On 5/30/07, Andrew Morton <akpm@...ux-foundation.org> wrote:
> On Tue, 29 May 2007 18:43:59 -0700 Yinghai Lu <Yinghai.Lu@....COM> wrote:
>
> > [PATCH 4/5] serial: convert early_uart to earlycon for 8250
>
> drivers/serial/8250_early.c: In function 'parse_options':
> drivers/serial/8250_early.c:143: error: 'FIX_EARLYCON_MEM_BASE' undeclared (first use in this function)
> drivers/serial/8250_early.c:143: error: (Each undeclared identifier is reported only once
>
> That was with http://userweb.kernel.org/~akpm/config-sony.txt, but this is
> going to break a whole pile of architectures (alpha, powerpc, others).

alpha, powerpc, others may need sth like ia64, if they do not support fixmap.

diff --git a/include/asm-ia64/io.h b/include/asm-ia64/io.h
index eb17a86..e29eaf8 100644
--- a/include/asm-ia64/io.h
+++ b/include/asm-ia64/io.h
@@ -423,6 +423,10 @@ extern void __iomem * ioremap(unsigned long
offset, unsigned long size);
 extern void __iomem * ioremap_nocache (unsigned long offset, unsigned
long size);
 extern void iounmap (volatile void __iomem *addr);

+/* for console=uart8250,mmio,0xffe5000,9600n8 */
+#define FIX_EARLYCON_MEM_BASE 1
+#define fix_ioremap(idx, phys) ioremap(phys, 64)
+
 /* Use normal IO mappings for DMI */
 #define dmi_ioremap ioremap
 #define dmi_iounmap(x,l) iounmap(x)


$ find . -name "fixmap.h"
./asm-sh/fixmap.h
./asm-um/fixmap.h
./asm-parisc/fixmap.h
./asm-x86_64/fixmap.h
./asm-sparc/fixmap.h
./asm-i386/fixmap.h
./asm-mips/fixmap.h

they will need
diff --git a/include/asm-x86_64/io.h b/include/asm-x86_64/io.h
index de2cd9a..e2d66de 100644
--- a/include/asm-x86_64/io.h
+++ b/include/asm-x86_64/io.h
@@ -145,6 +145,19 @@ extern void early_iounmap(void *addr, unsigned long size);
 extern void __iomem * ioremap_nocache (unsigned long offset, unsigned
long size);
 extern void iounmap(volatile void __iomem *addr);

+#include <asm/pgtable.h>
+#include <asm/fixmap.h>
+
+static inline void __iomem * fix_ioremap (unsigned idx, unsigned long phys)
+{
+       void __iomem * vaddr;
+       set_fixmap_nocache(idx, phys & PAGE_MASK);
+       vaddr = (void __iomem *)__fix_to_virt(idx);
+       vaddr += phys & ~PAGE_MASK;
+
+       return vaddr;
+}
+
 /*
 * ISA I/O bus memory addresses are 1:1 with the physical address.
 */

YH
-
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