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| author | Finn Thain <fthain@telegraphics.com.au> | 2018-12-01 01:53:10 +0100 |
|---|---|---|
| committer | Geert Uytterhoeven <geert@linux-m68k.org> | 2019-03-25 10:22:24 +0100 |
| commit | 3d744eee38f11cafb0fc332c3081ab1cd07a89f7 (patch) | |
| tree | 718d166ff2157d246bb9e2919ed2d98691e34772 /arch/m68k | |
| parent | m68k: mvme147: Handle timer counter overflow (diff) | |
| download | linux-3d744eee38f11cafb0fc332c3081ab1cd07a89f7.tar.xz linux-3d744eee38f11cafb0fc332c3081ab1cd07a89f7.zip | |
m68k: mvme16x: Convert to clocksource API
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>
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Diffstat (limited to 'arch/m68k')
| -rw-r--r-- | arch/m68k/mvme16x/config.c | 37 |
1 files 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) |