linux/drivers/clocksource/tango_xtal.c
Daniel Lezcano 177cf6e52b clocksources: Switch back to the clksrc table
All the clocksource drivers's init function are now converted to return
an error code. CLOCKSOURCE_OF_DECLARE is no longer used as well as the
clksrc-of table.

Let's convert back the names:
 - CLOCKSOURCE_OF_DECLARE_RET => CLOCKSOURCE_OF_DECLARE
 - clksrc-of-ret              => clksrc-of

Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>

For exynos_mct and samsung_pwm_timer:
Acked-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>

For arch/arc:
Acked-by: Vineet Gupta <vgupta@synopsys.com>

For mediatek driver:
Acked-by: Matthias Brugger <matthias.bgg@gmail.com>

For the Rockchip-part
Acked-by: Heiko Stuebner <heiko@sntech.de>

For STi :
Acked-by: Patrice Chotard <patrice.chotard@st.com>

For the mps2-timer.c and versatile.c changes:
Acked-by: Liviu Dudau <Liviu.Dudau@arm.com>

For the OXNAS part :
Acked-by: Neil Armstrong <narmstrong@baylibre.com>

For LPC32xx driver:
Acked-by: Sylvain Lemieux <slemieux.tyco@gmail.com>

For Broadcom Kona timer change:
Acked-by: Ray Jui <ray.jui@broadcom.com>

For Sun4i and Sun5i:
Acked-by: Chen-Yu Tsai <wens@csie.org>

For Meson6:
Acked-by: Carlo Caione <carlo@caione.org>

For Keystone:
Acked-by: Santosh Shilimkar <ssantosh@kernel.org>

For NPS:
Acked-by: Noam Camus <noamca@mellanox.com>

For bcm2835:
Acked-by: Eric Anholt <eric@anholt.net>
2016-06-28 10:19:35 +02:00

57 lines
1.3 KiB
C

#include <linux/clocksource.h>
#include <linux/sched_clock.h>
#include <linux/of_address.h>
#include <linux/printk.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/clk.h>
static void __iomem *xtal_in_cnt;
static struct delay_timer delay_timer;
static unsigned long notrace read_xtal_counter(void)
{
return readl_relaxed(xtal_in_cnt);
}
static u64 notrace read_sched_clock(void)
{
return read_xtal_counter();
}
static int __init tango_clocksource_init(struct device_node *np)
{
struct clk *clk;
int xtal_freq, ret;
xtal_in_cnt = of_iomap(np, 0);
if (xtal_in_cnt == NULL) {
pr_err("%s: invalid address\n", np->full_name);
return -ENXIO;
}
clk = of_clk_get(np, 0);
if (IS_ERR(clk)) {
pr_err("%s: invalid clock\n", np->full_name);
return PTR_ERR(clk);
}
xtal_freq = clk_get_rate(clk);
delay_timer.freq = xtal_freq;
delay_timer.read_current_timer = read_xtal_counter;
ret = clocksource_mmio_init(xtal_in_cnt, "tango-xtal", xtal_freq, 350,
32, clocksource_mmio_readl_up);
if (ret) {
pr_err("%s: registration failed\n", np->full_name);
return ret;
}
sched_clock_register(read_sched_clock, 32, xtal_freq);
register_current_timer_delay(&delay_timer);
return 0;
}
CLOCKSOURCE_OF_DECLARE(tango, "sigma,tick-counter", tango_clocksource_init);