forked from Minki/linux
838a2ae80a
The clockevent core is able to figure out the best mult and shift, calculate min_delta_ns and max_delta_ns, with the necessary info passed into clockevents_config_and_register(). Use this combined configure and register function where possible to make the codes less error prone and gain some positive diff stat. Signed-off-by: Shawn Guo <shawn.guo@linaro.org> Cc: Nicolas Ferre <nicolas.ferre@atmel.com> Reviewed-by: Anton Vorontsov <cbouatmailru@gmail.com> Acked-by: Kukjin Kim <kgene.kim@samsung.com> Cc: Russell King <linux@arm.linux.org.uk> Cc: Sascha Hauer <s.hauer@pengutronix.de> Cc: Jason Cooper <jason@lakedaemon.net> Tested-by: Roland Stigge <stigge@antcom.de> Acked-by: Eric Miao <eric.y.miao@gmail.com> Cc: Haojian Zhuang <haojian.zhuang@gmail.com> Cc: David Brown <davidb@codeaurora.org> Tested-by: Tony Lindgren <tony@atomide.com> Acked-by: Barry Song <baohua.song@csr.com> Tested-by: Stephen Warren <swarren@nvidia.com> Acked-by: Tony Prisk <linux@prisktech.co.nz> Cc: Lennert Buytenhek <buytenh@wantstofly.org> Cc: Wan ZongShun <mcuos.com@gmail.com> Acked-by: Viresh Kumar <viresh.kumar@linaro.org> Acked-by: Arnd Bergmann <arnd@arndb.de> Acked-by: Jason Cooper <jason@lakedaemon.net> Reviewed-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Olof Johansson <olof@lixom.net>
152 lines
4.0 KiB
C
152 lines
4.0 KiB
C
/*
|
|
* arch/arm/mach-netx/time.c
|
|
*
|
|
* Copyright (c) 2005 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2
|
|
* as published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*/
|
|
|
|
#include <linux/init.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/irq.h>
|
|
#include <linux/clocksource.h>
|
|
#include <linux/clockchips.h>
|
|
#include <linux/io.h>
|
|
|
|
#include <mach/hardware.h>
|
|
#include <asm/mach/time.h>
|
|
#include <mach/netx-regs.h>
|
|
|
|
#define TIMER_CLOCKEVENT 0
|
|
#define TIMER_CLOCKSOURCE 1
|
|
|
|
static void netx_set_mode(enum clock_event_mode mode,
|
|
struct clock_event_device *clk)
|
|
{
|
|
u32 tmode;
|
|
|
|
/* disable timer */
|
|
writel(0, NETX_GPIO_COUNTER_CTRL(TIMER_CLOCKEVENT));
|
|
|
|
switch (mode) {
|
|
case CLOCK_EVT_MODE_PERIODIC:
|
|
writel(LATCH, NETX_GPIO_COUNTER_MAX(TIMER_CLOCKEVENT));
|
|
tmode = NETX_GPIO_COUNTER_CTRL_RST_EN |
|
|
NETX_GPIO_COUNTER_CTRL_IRQ_EN |
|
|
NETX_GPIO_COUNTER_CTRL_RUN;
|
|
break;
|
|
|
|
case CLOCK_EVT_MODE_ONESHOT:
|
|
writel(0, NETX_GPIO_COUNTER_MAX(TIMER_CLOCKEVENT));
|
|
tmode = NETX_GPIO_COUNTER_CTRL_IRQ_EN |
|
|
NETX_GPIO_COUNTER_CTRL_RUN;
|
|
break;
|
|
|
|
default:
|
|
WARN(1, "%s: unhandled mode %d\n", __func__, mode);
|
|
/* fall through */
|
|
|
|
case CLOCK_EVT_MODE_SHUTDOWN:
|
|
case CLOCK_EVT_MODE_UNUSED:
|
|
case CLOCK_EVT_MODE_RESUME:
|
|
tmode = 0;
|
|
break;
|
|
}
|
|
|
|
writel(tmode, NETX_GPIO_COUNTER_CTRL(TIMER_CLOCKEVENT));
|
|
}
|
|
|
|
static int netx_set_next_event(unsigned long evt,
|
|
struct clock_event_device *clk)
|
|
{
|
|
writel(0 - evt, NETX_GPIO_COUNTER_CURRENT(TIMER_CLOCKEVENT));
|
|
return 0;
|
|
}
|
|
|
|
static struct clock_event_device netx_clockevent = {
|
|
.name = "netx-timer" __stringify(TIMER_CLOCKEVENT),
|
|
.features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT,
|
|
.set_next_event = netx_set_next_event,
|
|
.set_mode = netx_set_mode,
|
|
};
|
|
|
|
/*
|
|
* IRQ handler for the timer
|
|
*/
|
|
static irqreturn_t
|
|
netx_timer_interrupt(int irq, void *dev_id)
|
|
{
|
|
struct clock_event_device *evt = &netx_clockevent;
|
|
|
|
/* acknowledge interrupt */
|
|
writel(COUNTER_BIT(0), NETX_GPIO_IRQ);
|
|
|
|
evt->event_handler(evt);
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static struct irqaction netx_timer_irq = {
|
|
.name = "NetX Timer Tick",
|
|
.flags = IRQF_DISABLED | IRQF_TIMER | IRQF_IRQPOLL,
|
|
.handler = netx_timer_interrupt,
|
|
};
|
|
|
|
/*
|
|
* Set up timer interrupt
|
|
*/
|
|
static void __init netx_timer_init(void)
|
|
{
|
|
/* disable timer initially */
|
|
writel(0, NETX_GPIO_COUNTER_CTRL(0));
|
|
|
|
/* Reset the timer value to zero */
|
|
writel(0, NETX_GPIO_COUNTER_CURRENT(0));
|
|
|
|
writel(LATCH, NETX_GPIO_COUNTER_MAX(0));
|
|
|
|
/* acknowledge interrupt */
|
|
writel(COUNTER_BIT(0), NETX_GPIO_IRQ);
|
|
|
|
/* Enable the interrupt in the specific timer
|
|
* register and start timer
|
|
*/
|
|
writel(COUNTER_BIT(0), NETX_GPIO_IRQ_ENABLE);
|
|
writel(NETX_GPIO_COUNTER_CTRL_IRQ_EN | NETX_GPIO_COUNTER_CTRL_RUN,
|
|
NETX_GPIO_COUNTER_CTRL(0));
|
|
|
|
setup_irq(NETX_IRQ_TIMER0, &netx_timer_irq);
|
|
|
|
/* Setup timer one for clocksource */
|
|
writel(0, NETX_GPIO_COUNTER_CTRL(TIMER_CLOCKSOURCE));
|
|
writel(0, NETX_GPIO_COUNTER_CURRENT(TIMER_CLOCKSOURCE));
|
|
writel(0xffffffff, NETX_GPIO_COUNTER_MAX(TIMER_CLOCKSOURCE));
|
|
|
|
writel(NETX_GPIO_COUNTER_CTRL_RUN,
|
|
NETX_GPIO_COUNTER_CTRL(TIMER_CLOCKSOURCE));
|
|
|
|
clocksource_mmio_init(NETX_GPIO_COUNTER_CURRENT(TIMER_CLOCKSOURCE),
|
|
"netx_timer", CLOCK_TICK_RATE, 200, 32, clocksource_mmio_readl_up);
|
|
|
|
/* with max_delta_ns >= delta2ns(0x800) the system currently runs fine.
|
|
* Adding some safety ... */
|
|
netx_clockevent.cpumask = cpumask_of(0);
|
|
clockevents_config_and_register(&netx_clockevent, CLOCK_TICK_RATE,
|
|
0xa00, 0xfffffffe);
|
|
}
|
|
|
|
struct sys_timer netx_timer = {
|
|
.init = netx_timer_init,
|
|
};
|