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 13/14] m68k: mvme16x: Convert to clocksource API
Date: Sat, 01 Dec 2018 11:53:10 +1100 [thread overview]
Message-ID: <bf6454a0d8077d3f2fc289716a2f1565a1c59c62.1543625590.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.
---
arch/m68k/mvme16x/config.c | 37 +++++++++++++++++++++++++++++++------
1 file changed, 31 insertions(+), 6 deletions(-)
diff --git a/arch/m68k/mvme16x/config.c b/arch/m68k/mvme16x/config.c
index 3a3129e6f0bc..2c109ee2a1a5 100644
--- a/arch/m68k/mvme16x/config.c
+++ b/arch/m68k/mvme16x/config.c
@@ -19,6 +19,7 @@
#include <linux/mm.h>
#include <linux/seq_file.h>
#include <linux/tty.h>
+#include <linux/clocksource.h>
#include <linux/console.h>
#include <linux/linkage.h>
#include <linux/init.h>
@@ -343,6 +344,21 @@ static irqreturn_t mvme16x_abort_int (int irq, void *dev_id)
return IRQ_HANDLED;
}
+static u64 mvme16x_read_clk(struct clocksource *cs);
+
+static struct clocksource mvme16x_clk = {
+ .name = "pcc",
+ .rating = 250,
+ .read = mvme16x_read_clk,
+ .mask = CLOCKSOURCE_MASK(32),
+ .flags = CLOCK_SOURCE_IS_CONTINUOUS,
+};
+
+static u32 clk_total;
+
+#define PCC_TIMER_CLOCK_FREQ 1000000
+#define PCC_TIMER_CYCLES (PCC_TIMER_CLOCK_FREQ / HZ)
+
static irqreturn_t mvme16x_timer_int (int irq, void *dev_id)
{
irq_handler_t timer_routine = dev_id;
@@ -350,6 +366,7 @@ static irqreturn_t mvme16x_timer_int (int irq, void *dev_id)
local_irq_save(flags);
*(volatile unsigned char *)0xfff4201b |= 8;
+ clk_total += PCC_TIMER_CYCLES;
timer_routine(0, NULL);
local_irq_restore(flags);
@@ -363,13 +380,15 @@ void mvme16x_sched_init (irq_handler_t timer_routine)
/* Using PCCchip2 or MC2 chip tick timer 1 */
*(volatile unsigned long *)0xfff42008 = 0;
- *(volatile unsigned long *)0xfff42004 = 10000; /* 10ms */
+ *(volatile unsigned long *)0xfff42004 = PCC_TIMER_CYCLES;
*(volatile unsigned char *)0xfff42017 |= 3;
*(volatile unsigned char *)0xfff4201b = 0x16;
- if (request_irq(MVME16x_IRQ_TIMER, mvme16x_timer_int, 0, "timer",
+ if (request_irq(MVME16x_IRQ_TIMER, mvme16x_timer_int, IRQF_TIMER, "timer",
timer_routine))
panic ("Couldn't register timer int");
+ clocksource_register_hz(&mvme16x_clk, PCC_TIMER_CLOCK_FREQ);
+
if (brdno == 0x0162 || brdno == 0x172)
irq = MVME162_IRQ_ABORT;
else
@@ -379,11 +398,17 @@ void mvme16x_sched_init (irq_handler_t timer_routine)
panic ("Couldn't register abort int");
}
-
-/* This is always executed with interrupts disabled. */
-u32 mvme16x_gettimeoffset(void)
+static u64 mvme16x_read_clk(struct clocksource *cs)
{
- return (*(volatile u32 *)0xfff42008) * 1000;
+ unsigned long flags;
+ u32 ticks;
+
+ local_irq_save(flags);
+ ticks = *(volatile u32 *)0xfff42008;
+ ticks += clk_total;
+ local_irq_restore(flags);
+
+ return ticks;
}
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 ` Finn Thain [this message]
2018-12-01 0:53 ` [PATCH v4 10/14] m68k: mac: Convert to clocksource API 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 ` [PATCH v4 11/14] m68k: mvme147: " Finn Thain
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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