Commit 387904ff authored by Andrew Bresticker's avatar Andrew Bresticker Committed by Ralf Baechle

irqchip: mips-gic: Export function to read counter width

Export the function gic_get_count_width to read the width of
the GIC global counter from GIC_SH_CONFIG.  Update the GIC
clocksource driver to use this new function.
Signed-off-by: default avatarAndrew Bresticker <abrestic@chromium.org>
Cc: Daniel Lezcano <daniel.lezcano@linaro.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Jason Cooper <jason@lakedaemon.net>
Cc: Paul Burton <paul.burton@imgtec.com>
Cc: Qais Yousef <qais.yousef@imgtec.com>
Cc: John Crispin <blogic@openwrt.org>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/8124/Signed-off-by: default avatarRalf Baechle <ralf@linux-mips.org>
parent 7d9ad5d8
......@@ -370,6 +370,7 @@ extern void gic_init(unsigned long gic_base_addr,
unsigned int irqbase);
extern void gic_clocksource_init(unsigned int);
extern cycle_t gic_read_count(void);
extern unsigned int gic_get_count_width(void);
extern cycle_t gic_read_compare(void);
extern void gic_write_compare(cycle_t cnt);
extern void gic_write_cpu_compare(cycle_t cnt, int cpu);
......
......@@ -23,15 +23,8 @@ static struct clocksource gic_clocksource = {
void __init gic_clocksource_init(unsigned int frequency)
{
unsigned int config, bits;
/* Calculate the clocksource mask. */
GICREAD(GIC_REG(SHARED, GIC_SH_CONFIG), config);
bits = 32 + ((config & GIC_SH_CONFIG_COUNTBITS_MSK) >>
(GIC_SH_CONFIG_COUNTBITS_SHF - 2));
/* Set clocksource mask. */
gic_clocksource.mask = CLOCKSOURCE_MASK(bits);
gic_clocksource.mask = CLOCKSOURCE_MASK(gic_get_count_width());
/* Calculate a somewhat reasonable rating value. */
gic_clocksource.rating = 200 + frequency / 10000000;
......
......@@ -63,6 +63,17 @@ cycle_t gic_read_count(void)
return (((cycle_t) hi) << 32) + lo;
}
unsigned int gic_get_count_width(void)
{
unsigned int bits, config;
GICREAD(GIC_REG(SHARED, GIC_SH_CONFIG), config);
bits = 32 + 4 * ((config & GIC_SH_CONFIG_COUNTBITS_MSK) >>
GIC_SH_CONFIG_COUNTBITS_SHF);
return bits;
}
void gic_write_compare(cycle_t cnt)
{
GICWRITE(GIC_REG(VPE_LOCAL, GIC_VPE_COMPARE_HI),
......
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