linux-kernel - Re: [PATCH] hexagon: Clean up timer-regs.h

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Date:   Wed, 4 Aug 2021 11:31:13 -0700
From:   Nathan Chancellor <nathan@...nel.org>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Nick Desaulniers <ndesaulniers@...gle.com>,
        linux-hexagon@...r.kernel.org, linux-kernel@...r.kernel.org,
        clang-built-linux@...glegroups.com,
        Sid Manning <sidneym@...cinc.com>,
        Brian Cain <bcain@...eaurora.org>
Subject: Re: [PATCH] hexagon: Clean up timer-regs.h

On Wed, Jul 28, 2021 at 10:07:45AM -0500, Brian Cain wrote:
> > -----Original Message-----
> > From: Nathan Chancellor <nathan@...nel.org>
> ...
> > When building allmodconfig, there is a warning about TIMER_ENABLE being
> > redefined:
> > 
> >  drivers/clocksource/timer-oxnas-rps.c:39:9: warning: 'TIMER_ENABLE'
> >  macro redefined [-Wmacro-redefined]
> >  #define TIMER_ENABLE            BIT(7)
> >          ^
> >  arch/hexagon/include/asm/timer-regs.h:13:9: note: previous definition
> >  is here
> >  #define TIMER_ENABLE            0
> >          ^
> >  1 warning generated.
> > 
> > The values in this header are only used in one file each, if they are
> > used at all. Remove the header and sink all of the constants into their
> > respective files.
> > 
> > TCX0_CLK_RATE is only used in arch/hexagon/include/asm/timex.h
> > 
> > TIMER_ENABLE, RTOS_TIMER_INT, RTOS_TIMER_REGS_ADDR are only used in
> > arch/hexagon/kernel/time.c.
> > 
> > SLEEP_CLK_RATE and TIMER_CLR_ON_MATCH have both been unused since
> > the
> > file's introduction in commit 71e4a47f32f4 ("Hexagon: Add time and timer
> > functions").
> > 
> > TIMER_ENABLE is redefined as BIT(0) so the shift is moved into the
> > definition, rather than its use.
> > 
> > Signed-off-by: Nathan Chancellor <nathan@...nel.org>
> > ---
> >  arch/hexagon/include/asm/timer-regs.h | 26 --------------------------
> >  arch/hexagon/include/asm/timex.h      |  3 +--
> >  arch/hexagon/kernel/time.c            | 12 ++++++++++--
> >  3 files changed, 11 insertions(+), 30 deletions(-)
> >  delete mode 100644 arch/hexagon/include/asm/timer-regs.h
> > 
> > diff --git a/arch/hexagon/include/asm/timer-regs.h
> > b/arch/hexagon/include/asm/timer-regs.h
> > deleted file mode 100644
> > index ee6c61423a05..000000000000
> > --- a/arch/hexagon/include/asm/timer-regs.h
> > +++ /dev/null
> > @@ -1,26 +0,0 @@
> > -/* SPDX-License-Identifier: GPL-2.0-only */
> > -/*
> > - * Timer support for Hexagon
> > - *
> > - * Copyright (c) 2010-2011, The Linux Foundation. All rights reserved.
> > - */
> > -
> > -#ifndef _ASM_TIMER_REGS_H
> > -#define _ASM_TIMER_REGS_H
> > -
> > -/*  This stuff should go into a platform specific file  */
> > -#define TCX0_CLK_RATE		19200
> > -#define TIMER_ENABLE		0
> > -#define TIMER_CLR_ON_MATCH	1
> > -
> > -/*
> > - * 8x50 HDD Specs 5-8.  Simulator co-sim not fixed until
> > - * release 1.1, and then it's "adjustable" and probably not defaulted.
> > - */
> > -#define RTOS_TIMER_INT		3
> > -#ifdef CONFIG_HEXAGON_COMET
> > -#define RTOS_TIMER_REGS_ADDR	0xAB000000UL
> > -#endif
> > -#define SLEEP_CLK_RATE		32000
> > -
> > -#endif
> > diff --git a/arch/hexagon/include/asm/timex.h
> > b/arch/hexagon/include/asm/timex.h
> > index 8d4ec76fceb4..dfe69e118b2b 100644
> > --- a/arch/hexagon/include/asm/timex.h
> > +++ b/arch/hexagon/include/asm/timex.h
> > @@ -7,11 +7,10 @@
> >  #define _ASM_TIMEX_H
> > 
> >  #include <asm-generic/timex.h>
> > -#include <asm/timer-regs.h>
> >  #include <asm/hexagon_vm.h>
> > 
> >  /* Using TCX0 as our clock.  CLOCK_TICK_RATE scheduled to be removed. */
> > -#define CLOCK_TICK_RATE              TCX0_CLK_RATE
> > +#define CLOCK_TICK_RATE              19200
> > 
> >  #define ARCH_HAS_READ_CURRENT_TIMER
> > 
> > diff --git a/arch/hexagon/kernel/time.c b/arch/hexagon/kernel/time.c
> > index feffe527ac92..febc95714d75 100644
> > --- a/arch/hexagon/kernel/time.c
> > +++ b/arch/hexagon/kernel/time.c
> > @@ -17,9 +17,10 @@
> >  #include <linux/of_irq.h>
> >  #include <linux/module.h>
> > 
> > -#include <asm/timer-regs.h>
> >  #include <asm/hexagon_vm.h>
> > 
> > +#define TIMER_ENABLE		BIT(0)
> > +
> >  /*
> >   * For the clocksource we need:
> >   *	pcycle frequency (600MHz)
> > @@ -33,6 +34,13 @@ cycles_t	pcycle_freq_mhz;
> >  cycles_t	thread_freq_mhz;
> >  cycles_t	sleep_clk_freq;
> > 
> > +/*
> > + * 8x50 HDD Specs 5-8.  Simulator co-sim not fixed until
> > + * release 1.1, and then it's "adjustable" and probably not defaulted.
> > + */
> > +#define RTOS_TIMER_INT		3
> > +#define RTOS_TIMER_REGS_ADDR	0xAB000000UL
> > +
> >  static struct resource rtos_timer_resources[] = {
> >  	{
> >  		.start	= RTOS_TIMER_REGS_ADDR,
> > @@ -80,7 +88,7 @@ static int set_next_event(unsigned long delta, struct
> > clock_event_device *evt)
> >  	iowrite32(0, &rtos_timer->clear);
> > 
> >  	iowrite32(delta, &rtos_timer->match);
> > -	iowrite32(1 << TIMER_ENABLE, &rtos_timer->enable);
> > +	iowrite32(TIMER_ENABLE, &rtos_timer->enable);
> >  	return 0;
> >  }
> > 
> > 
> > base-commit: 7d549995d4e0d99b68e8a7793a0d23da6fc40fe8
> 
> Acked-by: Brian Cain <bcain@...eaurora.org>

Thanks Brian. Andrew, if you would not mind picking this up, I would
appreciate it!

Cheers,
Nathan