On Monday 17 September 2012, Tony Lindgren wrote:
> * Tony Lindgren <t...@atomide.com> [120916 13:39]:
> > * Arnd Bergmann <a...@arndb.de> [120915 13:15]:
> > > On Saturday 15 September 2012, Tony Lindgren wrote:
> > > > With my patches, this is now all omap1 specific and
> > > > moved to arch/arm/mach-omap1/include/mach/hardware.h.
> > > > It's probably easiest to just update this patch on
> > > > top of the hardware.h changes I've done.
> > >
> > > Yes, sounds good. Do you want to send a patch for that
> > > and let me drop this one then?
> >
> > Yes I can pick this one and update it against one of my
> > branches to avoid merge conflicts.
>
> This applies against mach-omap1/include/mach/hardware.h
> with some fuzz so no issues there.
>
> But I think we should not apply it as these are physical
> addresses, not virtual addresses for omap1.
Right, I misread what is actually going on here because the
only driver I looked at treated the address as a virtual
address pointer.
> We have IOMEM already in use for omap_read/write because of:
>
> #define OMAP1_IO_ADDRESS(pa) IOMEM((pa) - OMAP1_IO_OFFSET)
>
> I think the right solution is to eventually get rid of
> omap_read/write for omap1 also and replace them with ioremap
> + readl/writel.
Agreed.
> Or am I missing something?
I did not see any new warnings for omap1, but I did see this
on omap2plus_defconfig:
drivers/watchdog/omap_wdt.c: In function 'omap_wdt_ioctl':
drivers/watchdog/omap_wdt.c:222:4: error: passing argument 1 of '__raw_readw'
makes pointer from integer without a cast [-Werror]
arch/arm/include/asm/io.h:71:90: note: expected 'const volatile void *' but
argument is of type 'unsigned int'
It seems I misinterpreted this, and it's actually a bug in the watchdog
driver that should be fixed using this patch instead (and backport it
to stable)
diff --git a/drivers/watchdog/omap_wdt.c b/drivers/watchdog/omap_wdt.c
index fceec4f..7b45802 100644
--- a/drivers/watchdog/omap_wdt.c
+++ b/drivers/watchdog/omap_wdt.c
@@ -218,9 +218,11 @@ static long omap_wdt_ioctl(struct file *file, unsigned int
cmd,
case WDIOC_GETSTATUS:
return put_user(0, (int __user *)arg);
case WDIOC_GETBOOTSTATUS:
+#ifdef CONFIG_ARCH_OMAP1
if (cpu_is_omap16xx())
- return put_user(__raw_readw(ARM_SYSST),
+ return put_user(omap_readw(ARM_SYSST),
(int __user *)arg);
+#endif
if (cpu_is_omap24xx())
return put_user(omap_prcm_get_reset_sources(),
(int __user *)arg);
This bug seems to have been introduced in 2008 by 9f69e3b0c "[WATCHDOG]
omap_wdt.c: another ioremap() fix" without anyone ever noticing and now
got caught. Of course it should be replaced by something better when
omap_read/write is finally getting removed.
I'll drop my omap patch for now, because it's obviously wrong, and let
you guys figure out what to do about the watchdog driver.
Arnd
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