From: Ralf Baechle <ralf@linux-mips.org>
To: Gerhard Pircher <gerhard_pircher@gmx.net>
Cc: linux-mips@linux-mips.org, linuxppc-dev@lists.ozlabs.org,
linux-alpha@vger.kernel.org, linux-arch@vger.kernel.org,
linux-kernel@vger.kernel.org,
Thomas Gleixner <tglx@linutronix.de>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>
Subject: Re: [patch 00/14] Sort out i8253 and PC speaker locking and headers
Date: Fri, 3 Jun 2011 19:00:38 +0100 [thread overview]
Message-ID: <20110603180038.GA13239@linux-mips.org> (raw)
Message-ID: <20110603180038.Xqf5Pg7knR8agVyA55maX8G_F_B-TIbq6OJcnQ5o7wA@z> (raw)
In-Reply-To: <20110602191119.302850@gmx.net>
On Thu, Jun 02, 2011 at 09:11:19PM +0200, Gerhard Pircher wrote:
> > #if defined(CONFIG_MIPS) || defined(CONFIG_X86)
> > /* Use the global PIT lock ! */
> > #include <asm/i8253.h>
> > #else
> > #include <asm/8253pit.h>
> > static DEFINE_RAW_SPINLOCK(i8253_lock);
> > #endif
> >
> > sound/drivers/pcsp/pcsp.h:
> >
> > #if defined(CONFIG_MIPS) || defined(CONFIG_X86)
> > /* Use the global PIT lock ! */
> > #include <asm/i8253.h>
> > #else
> > #include <asm/8253pit.h>
> > static DEFINE_RAW_SPINLOCK(i8253_lock);
> >
> > $ git grep -F pcsp.h sound/drivers/pcsp
> > sound/drivers/pcsp/pcsp.c:#include "pcsp.h"
> > sound/drivers/pcsp/pcsp_input.c:#include "pcsp.h"
> > sound/drivers/pcsp/pcsp_lib.c:#include "pcsp.h"
> > sound/drivers/pcsp/pcsp_mixer.c:#include "pcsp.h"
> > $ git grep -w i8253_lock sound/drivers/pcsp/
> > sound/drivers/pcsp/pcsp.h:static DEFINE_RAW_SPINLOCK(i8253_lock);
> > sound/drivers/pcsp/pcsp_input.c: raw_spin_lock_irqsave(&i8253_lock,
> > flags
> > sound/drivers/pcsp/pcsp_input.c:
> > raw_spin_unlock_irqrestore(&i8253_lock,
> > sound/drivers/pcsp/pcsp_lib.c: raw_spin_lock_irqsave(&i8253_lock,
> > flags
> > sound/drivers/pcsp/pcsp_lib.c:
> > raw_spin_unlock_irqrestore(&i8253_lock,
> > sound/drivers/pcsp/pcsp_lib.c: raw_spin_lock(&i8253_lock);
> > sound/drivers/pcsp/pcsp_lib.c: raw_spin_unlock(&i8253_lock);
> > sound/drivers/pcsp/pcsp_lib.c: raw_spin_lock(&i8253_lock);
> > sound/drivers/pcsp/pcsp_lib.c: raw_spin_unlock(&i8253_lock);
> >
> > Locks are great, everybody should have their own lock!
> >
> > $ find . -name 8253pit.h
> > ./arch/powerpc/include/asm/8253pit.h
> > ./arch/alpha/include/asm/8253pit.h
> > $ cat arch/*/include/asm/8253pit.h
> > /*
> > * 8253/8254 Programmable Interval Timer
> > */
> > /*
> > * 8253/8254 Programmable Interval Timer
> > */
> > $
> >
> > Eh...
> >
> > $ git grep -w PCSPKR_PLATFORM
> > arch/mips/Kconfig: select PCSPKR_PLATFORM
> > arch/mips/Kconfig: select PCSPKR_PLATFORM
> > arch/mips/Kconfig: select PCSPKR_PLATFORM
> > arch/powerpc/platforms/amigaone/Kconfig: select PCSPKR_PLATFORM
> > drivers/input/misc/Kconfig: depends on PCSPKR_PLATFORM
> > init/Kconfig:config PCSPKR_PLATFORM
> > sound/drivers/Kconfig: depends on PCSPKR_PLATFORM && X86 &&
> > HIGH_RES_TIMERS
> >
> > So the status is:
> >
> > Alpha: There is no PCSPKR_PLATFORM so while a platform device is
> > being installed no drivers will be built. I don't know
> > which Alpha platforms or even if all of Alpha should be
> > doing a PCSPKR_PLATFORM so I haven't even tried to sort
> > this.
> > ARM: No PC speaker supported, yeah :)
> > PowerPC: Should compile but the locking is wrong but only the
> > AmigaOne platforms should be affected.
> The Kconfig dependencies cleanup patch for CHRP, PSERIES, etc. should
> also apply to the AmigaOne. Can you resend it with a fix for the
> AmigaOne, or should I send a patch?
I can sort that; it's easy enough.
> I'll check next week, if the PC speaker is still working on my AmigaOne.
I can't imagine that it's going to break - the code is sorta simple ;-)
One obscurity I noticed is this bit in the amigaone.dts:
timer@40 {
// Also adds pcspkr to platform devices.
compatible = "pnpPNP,100";
reg = <1 0x00000040 0x00000020>;
};
Shouldn't that rather be something like the following?
pcspeaker@61 {
device_type = "sound";
compatible = "pnpPNP,800";
reg = <1 0x61 1>;
};
pnpPNP,100 is the i8253 timer as I understand and pnpPNP,800 the PC speaker.
If you interpret pnpPNP,100 to imply the presence of a PC speaker you can't
express a system that has a i8253 but no PCspeaker in a DT so maybe
amigaone.dts and arch/powerpc/kernel/setup-common.c should be changed to
use pnpPNP,800 instead?
Ralf
next prev parent reply other threads:[~2011-06-03 18:00 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-06-01 18:04 [patch 00/14] Sort out i8253 and PC speaker locking and headers ralf
2011-06-01 18:04 ` ralf
2011-06-01 18:04 ` [patch 01/14] i8253: Create <linux/i8253.h> and make all in kernel users to use it ralf
2011-06-01 18:04 ` ralf
2011-06-01 18:04 ` [patch 02/14] i8253: Unify all kernel declarations of i8253_lock in <linux/i8253.h> ralf
2011-06-01 18:04 ` ralf
2011-06-01 18:04 ` [patch 03/14] i8253: Consolidate all kernel definitions of i8253_lock in lib/i8253-lock.c ralf
2011-06-01 18:05 ` [patch 04/14] i8253: Make MIPS use the shared i8253_lock ralf
2011-06-01 18:05 ` [patch 05/14] i8253: Make x86 " ralf
2011-06-01 18:05 ` [patch 06/14] i8253: Make pcspkr input driver " ralf
2011-06-01 18:05 ` ralf
2011-06-01 18:05 ` [patch 07/14] i8253: Make pcsp sound " ralf
2011-06-01 18:05 ` ralf
2011-06-03 9:53 ` Takashi Iwai
2011-06-03 9:53 ` [alsa-devel] " Takashi Iwai
2011-06-01 18:05 ` [patch 08/14] i8253: Alpha: Cleanup remaining users of i8253pit.h ralf
2011-06-01 18:05 ` ralf
2011-06-01 18:05 ` [patch 09/14] i8253: Alpha, PowerPC: Remove unused <asm/8253pit.h> header ralf
2011-06-01 18:05 ` ralf
2011-06-09 5:07 ` Benjamin Herrenschmidt
2011-06-09 5:07 ` Benjamin Herrenschmidt
2011-06-01 18:05 ` [patch 10/14] i8253: x86: Consolidate definitions of global_clock_event ralf
2011-06-01 18:05 ` ralf
2011-06-01 18:05 ` [patch 11/14] i8253: Consolidate definitions of PIT_LATCH ralf
2011-06-01 18:05 ` ralf
2011-06-01 18:05 ` [patch 12/14] i8253: Move remaining content and delete <asm/i8253.h> ralf
2011-06-01 18:05 ` ralf
2011-06-02 11:29 ` Sergei Shtylyov
2011-06-01 18:05 ` [patch 13/14] PCSPKR: Cleanup Kconfig dependencies ralf
2011-06-01 18:05 ` ralf
2011-06-09 5:09 ` Benjamin Herrenschmidt
2011-06-09 5:09 ` Benjamin Herrenschmidt
2011-06-01 18:05 ` [patch 14/14] PCSPKR: MIPS: Make config dependencies finer grained ralf
2011-06-01 18:05 ` ralf
2011-06-02 19:11 ` [patch 00/14] Sort out i8253 and PC speaker locking and headers Gerhard Pircher
2011-06-02 19:11 ` Gerhard Pircher
2011-06-03 18:00 ` Ralf Baechle [this message]
2011-06-03 18:00 ` Ralf Baechle
2011-06-03 19:22 ` Gerhard Pircher
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