From 5afd3d06e5cb30a312aaa34348f9457b9fb38a52 Mon Sep 17 00:00:00 2001 From: Finn Thain Date: Sat, 1 Dec 2018 11:53:10 +1100 Subject: m68k: amiga: Convert to clocksource API Add a platform clocksource by adapting the existing arch_gettimeoffset implementation. Signed-off-by: Finn Thain Acked-by: Linus Walleij Tested-by: Michael Schmitz Signed-off-by: Geert Uytterhoeven --- arch/m68k/amiga/config.c | 46 +++++++++++++++++++++++++++++++++++++--------- 1 file changed, 37 insertions(+), 9 deletions(-) (limited to 'arch') diff --git a/arch/m68k/amiga/config.c b/arch/m68k/amiga/config.c index d4976c1aa0cc..c32ab8041cf6 100644 --- a/arch/m68k/amiga/config.c +++ b/arch/m68k/amiga/config.c @@ -17,6 +17,7 @@ #include #include #include +#include #include #include #include @@ -461,7 +462,29 @@ void __init config_amiga(void) *(unsigned char *)ZTWO_VADDR(0xde0002) |= 0x80; } +static u64 amiga_read_clk(struct clocksource *cs); + +static struct clocksource amiga_clk = { + .name = "ciab", + .rating = 250, + .read = amiga_read_clk, + .mask = CLOCKSOURCE_MASK(32), + .flags = CLOCK_SOURCE_IS_CONTINUOUS, +}; + static unsigned short jiffy_ticks; +static u32 clk_total, clk_offset; + +static irqreturn_t ciab_timer_handler(int irq, void *dev_id) +{ + irq_handler_t timer_routine = dev_id; + + clk_total += jiffy_ticks; + clk_offset = 0; + timer_routine(0, NULL); + + return IRQ_HANDLED; +} static void __init amiga_sched_init(irq_handler_t timer_routine) { @@ -481,19 +504,22 @@ static void __init amiga_sched_init(irq_handler_t timer_routine) * Please don't change this to use ciaa, as it interferes with the * SCSI code. We'll have to take a look at this later */ - if (request_irq(IRQ_AMIGA_CIAB_TA, timer_routine, 0, "timer", NULL)) + if (request_irq(IRQ_AMIGA_CIAB_TA, ciab_timer_handler, IRQF_TIMER, + "timer", timer_routine)) pr_err("Couldn't register timer interrupt\n"); /* start timer */ ciab.cra |= 0x11; -} -#define TICK_SIZE 10000 + clocksource_register_hz(&amiga_clk, amiga_eclock); +} -/* This is always executed with interrupts disabled. */ -static u32 amiga_gettimeoffset(void) +static u64 amiga_read_clk(struct clocksource *cs) { unsigned short hi, lo, hi2; - u32 ticks, offset = 0; + unsigned long flags; + u32 ticks; + + local_irq_save(flags); /* read CIA B timer A current value */ hi = ciab.tahi; @@ -510,12 +536,14 @@ static u32 amiga_gettimeoffset(void) if (ticks > jiffy_ticks / 2) /* check for pending interrupt */ if (cia_set_irq(&ciab_base, 0) & CIA_ICR_TA) - offset = 10000; + clk_offset = jiffy_ticks; ticks = jiffy_ticks - ticks; - ticks = (10000 * ticks) / jiffy_ticks; + ticks += clk_offset + clk_total; + + local_irq_restore(flags); - return (ticks + offset) * 1000; + return ticks; } static void amiga_reset(void) __noreturn; -- cgit v1.2.3