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clocksource: cadence_ttc: Add support for 32bit mode 

New TTCs support 32bit mode. Older versions support
only 16bit modes. Keep 16bit mode as default
and 32bit optional.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
hifive-unleashed-5.1
Michal Simek 2014-09-29 01:50:05 +02:00 committed by Daniel Lezcano
parent 2743f1beb0
commit 4e2bec0c32
1 changed files with 10 additions and 5 deletions
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15
drivers/clocksource/cadence_ttc_timer.c
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@ -25,7 +25,7 @@
#include <linux/sched_clock.h>
/*
* This driver configures the 2 16-bit count-up timers as follows:
* This driver configures the 2 16/32-bit count-up timers as follows:
*
* T1: Timer 1, clocksource for generic timekeeping
* T2: Timer 2, clockevent source for hrtimers
@ -321,7 +321,8 @@ static int ttc_rate_change_clocksource_cb(struct notifier_block *nb,
return NOTIFY_DONE;
}
static void __init ttc_setup_clocksource(struct clk *clk, void __iomem *base)
static void __init ttc_setup_clocksource(struct clk *clk, void __iomem *base,
u32 timer_width)
{
struct ttc_timer_clocksource *ttccs;
int err;
@ -351,7 +352,7 @@ static void __init ttc_setup_clocksource(struct clk *clk, void __iomem *base)
ttccs->cs.name = "ttc_clocksource";
ttccs->cs.rating = 200;
ttccs->cs.read = __ttc_clocksource_read;
ttccs->cs.mask = CLOCKSOURCE_MASK(16);
ttccs->cs.mask = CLOCKSOURCE_MASK(timer_width);
ttccs->cs.flags = CLOCK_SOURCE_IS_CONTINUOUS;
/*
@ -372,7 +373,8 @@ static void __init ttc_setup_clocksource(struct clk *clk, void __iomem *base)
}
ttc_sched_clock_val_reg = base + TTC_COUNT_VAL_OFFSET;
sched_clock_register(ttc_sched_clock_read, 16, ttccs->ttc.freq / PRESCALE);
sched_clock_register(ttc_sched_clock_read, timer_width,
ttccs->ttc.freq / PRESCALE);
}
static int ttc_rate_change_clockevent_cb(struct notifier_block *nb,
@ -467,6 +469,7 @@ static void __init ttc_timer_init(struct device_node *timer)
struct clk *clk_cs, *clk_ce;
static int initialized;
int clksel;
u32 timer_width = 16;
if (initialized)
return;
@ -490,6 +493,8 @@ static void __init ttc_timer_init(struct device_node *timer)
BUG();
}
of_property_read_u32(timer, "timer-width", &timer_width);
clksel = readl_relaxed(timer_baseaddr + TTC_CLK_CNTRL_OFFSET);
clksel = !!(clksel & TTC_CLK_CNTRL_CSRC_MASK);
clk_cs = of_clk_get(timer, clksel);
@ -506,7 +511,7 @@ static void __init ttc_timer_init(struct device_node *timer)
BUG();
}
ttc_setup_clocksource(clk_cs, timer_baseaddr);
ttc_setup_clocksource(clk_cs, timer_baseaddr, timer_width);
ttc_setup_clockevent(clk_ce, timer_baseaddr + 4, irq);
pr_info("%s #0 at %p, irq=%d\n", timer->name, timer_baseaddr, irq);