From: Finn Thain <fthain@telegraphics.com.au>
To: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Andreas Schwab <schwab@linux-m68k.org>,
Arnd Bergmann <arnd@arndb.de>,
Stephen N Chivers <schivers@csc.com.au>,
Thomas Gleixner <tglx@linutronix.de>,
Kars de Jong <jongk@linux-m68k.org>,
Daniel Lezcano <daniel.lezcano@linaro.org>,
Michael Schmitz <schmitzmic@gmail.com>,
John Stultz <john.stultz@linaro.org>,
Linus Walleij <linus.walleij@linaro.org>,
linux-m68k@lists.linux-m68k.org, linux-kernel@vger.kernel.org
Subject: [PATCH v4 11/14] m68k: mvme147: Convert to clocksource API
Date: Sat, 01 Dec 2018 11:53:10 +1100 [thread overview]
Message-ID: <68b40c64e1cc2f095f93cf27f860f8f6fc0152cc.1543625590.git.fthain@telegraphics.com.au> (raw)
In-Reply-To: <cover.1543625590.git.fthain@telegraphics.com.au>
Add a platform clocksource by adapting the existing arch_gettimeoffset
implementation.
Signed-off-by: Finn Thain <fthain@telegraphics.com.au>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
---
Changed since v1:
- Moved clk_total access to within the irq lock.
- Use type u32 for tick counter.
---
arch/m68k/include/asm/mvme147hw.h | 1 -
arch/m68k/mvme147/config.c | 36 +++++++++++++++++++++++++------
2 files changed, 30 insertions(+), 7 deletions(-)
diff --git a/arch/m68k/include/asm/mvme147hw.h b/arch/m68k/include/asm/mvme147hw.h
index 9c7ff67c5ffd..7c3dd513128e 100644
--- a/arch/m68k/include/asm/mvme147hw.h
+++ b/arch/m68k/include/asm/mvme147hw.h
@@ -66,7 +66,6 @@ struct pcc_regs {
#define PCC_INT_ENAB 0x08
#define PCC_TIMER_INT_CLR 0x80
-#define PCC_TIMER_PRELOAD 63936l
#define PCC_LEVEL_ABORT 0x07
#define PCC_LEVEL_SERIAL 0x04
diff --git a/arch/m68k/mvme147/config.c b/arch/m68k/mvme147/config.c
index 4ef4faa5ed8b..c44a254e8a8c 100644
--- a/arch/m68k/mvme147/config.c
+++ b/arch/m68k/mvme147/config.c
@@ -17,6 +17,7 @@
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/tty.h>
+#include <linux/clocksource.h>
#include <linux/console.h>
#include <linux/linkage.h>
#include <linux/init.h>
@@ -92,6 +93,21 @@ void __init config_mvme147(void)
vme_brdtype = VME_TYPE_MVME147;
}
+static u64 mvme147_read_clk(struct clocksource *cs);
+
+static struct clocksource mvme147_clk = {
+ .name = "pcc",
+ .rating = 250,
+ .read = mvme147_read_clk,
+ .mask = CLOCKSOURCE_MASK(32),
+ .flags = CLOCK_SOURCE_IS_CONTINUOUS,
+};
+
+static u32 clk_total;
+
+#define PCC_TIMER_CLOCK_FREQ 160000
+#define PCC_TIMER_CYCLES (PCC_TIMER_CLOCK_FREQ / HZ)
+#define PCC_TIMER_PRELOAD (0x10000 - PCC_TIMER_CYCLES)
/* Using pcc tick timer 1 */
@@ -103,6 +119,7 @@ static irqreturn_t mvme147_timer_int (int irq, void *dev_id)
local_irq_save(flags);
m147_pcc->t1_int_cntrl = PCC_TIMER_INT_CLR;
m147_pcc->t1_int_cntrl = PCC_INT_ENAB|PCC_LEVEL_TIMER1;
+ clk_total += PCC_TIMER_CYCLES;
timer_routine(0, NULL);
local_irq_restore(flags);
@@ -112,32 +129,39 @@ static irqreturn_t mvme147_timer_int (int irq, void *dev_id)
void mvme147_sched_init (irq_handler_t timer_routine)
{
- if (request_irq(PCC_IRQ_TIMER1, mvme147_timer_int, 0, "timer 1",
- timer_routine))
+ if (request_irq(PCC_IRQ_TIMER1, mvme147_timer_int, IRQF_TIMER,
+ "timer 1", timer_routine))
pr_err("Couldn't register timer interrupt\n");
/* Init the clock with a value */
- /* our clock goes off every 6.25us */
+ /* The clock counter increments until 0xFFFF then reloads */
m147_pcc->t1_preload = PCC_TIMER_PRELOAD;
m147_pcc->t1_cntrl = 0x0; /* clear timer */
m147_pcc->t1_cntrl = 0x3; /* start timer */
m147_pcc->t1_int_cntrl = PCC_TIMER_INT_CLR; /* clear pending ints */
m147_pcc->t1_int_cntrl = PCC_INT_ENAB|PCC_LEVEL_TIMER1;
+
+ clocksource_register_hz(&mvme147_clk, PCC_TIMER_CLOCK_FREQ);
}
-/* This is always executed with interrupts disabled. */
/* XXX There are race hazards in this code XXX */
-u32 mvme147_gettimeoffset(void)
+static u64 mvme147_read_clk(struct clocksource *cs)
{
+ unsigned long flags;
volatile unsigned short *cp = (volatile unsigned short *)0xfffe1012;
unsigned short n;
+ u32 ticks;
+ local_irq_save(flags);
n = *cp;
while (n != *cp)
n = *cp;
n -= PCC_TIMER_PRELOAD;
- return ((unsigned long)n * 25 / 4) * 1000;
+ ticks = clk_total + n;
+ local_irq_restore(flags);
+
+ return ticks;
}
static int bcd2int (unsigned char b)
--
2.18.1
next prev parent reply other threads:[~2018-12-01 1:00 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-12-01 0:53 [PATCH v4 00/14] m68k: Drop arch_gettimeoffset and adopt clocksource API Finn Thain
2018-12-01 0:53 ` [PATCH v4 05/14] m68k: amiga: Convert to " Finn Thain
2018-12-01 0:53 ` [PATCH v4 02/14] m68k: mac: Fix VIA timer counter accesses Finn Thain
2018-12-01 0:53 ` [PATCH v4 01/14] m68k: Call timer_interrupt() with interrupts disabled Finn Thain
2018-12-01 0:53 ` [PATCH v4 09/14] m68k: hp300: Handle timer counter overflow Finn Thain
2018-12-01 0:53 ` [PATCH v4 03/14] m68k: apollo, q40, sun3, sun3x: Remove arch_gettimeoffset implementations Finn Thain
2018-12-01 0:53 ` [PATCH v4 12/14] m68k: mvme147: Handle timer counter overflow Finn Thain
2018-12-01 0:53 ` [PATCH v4 13/14] m68k: mvme16x: Convert to clocksource API Finn Thain
2018-12-01 0:53 ` [PATCH v4 10/14] m68k: mac: " Finn Thain
2018-12-01 0:53 ` [PATCH v4 04/14] m68k: Drop ARCH_USES_GETTIMEOFFSET Finn Thain
2018-12-01 0:53 ` [PATCH v4 07/14] m68k: bvme6000: Convert to clocksource API Finn Thain
2018-12-01 0:53 ` [PATCH v4 14/14] m68k: mvme16x: Handle timer counter overflow Finn Thain
2018-12-01 0:53 ` [PATCH v4 08/14] m68k: hp300: Convert to clocksource API Finn Thain
2018-12-01 0:53 ` [PATCH v4 06/14] m68k: atari: " Finn Thain
2018-12-01 0:53 ` Finn Thain [this message]
2019-03-05 6:13 ` [PATCH v4 00/14] m68k: Drop arch_gettimeoffset and adopt " Finn Thain
2019-03-05 7:50 ` Geert Uytterhoeven
2019-03-05 9:55 ` Finn Thain
2019-03-05 12:01 ` Linus Walleij
2019-03-25 9:25 ` Geert Uytterhoeven
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