--- /dev/null
- .shift = 20,
+/*
+ * linux/arch/arm/common/timer-sp.c
+ *
+ * Copyright (C) 1999 - 2003 ARM Limited
+ * Copyright (C) 2000 Deep Blue Solutions Ltd
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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/clocksource.h>
+#include <linux/clockchips.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/io.h>
+
+#include <asm/hardware/arm_timer.h>
+
+/*
+ * These timers are currently always setup to be clocked at 1MHz.
+ */
+#define TIMER_FREQ_KHZ (1000)
+#define TIMER_RELOAD (TIMER_FREQ_KHZ * 1000 / HZ)
+
+static void __iomem *clksrc_base;
+
+static cycle_t sp804_read(struct clocksource *cs)
+{
+ return ~readl(clksrc_base + TIMER_VALUE);
+}
+
+static struct clocksource clocksource_sp804 = {
+ .name = "timer3",
+ .rating = 200,
+ .read = sp804_read,
+ .mask = CLOCKSOURCE_MASK(32),
- cs->mult = clocksource_khz2mult(TIMER_FREQ_KHZ, cs->shift);
- clocksource_register(cs);
+ .flags = CLOCK_SOURCE_IS_CONTINUOUS,
+};
+
+void __init sp804_clocksource_init(void __iomem *base)
+{
+ struct clocksource *cs = &clocksource_sp804;
+
+ clksrc_base = base;
+
+ /* setup timer 0 as free-running clocksource */
+ writel(0, clksrc_base + TIMER_CTRL);
+ writel(0xffffffff, clksrc_base + TIMER_LOAD);
+ writel(0xffffffff, clksrc_base + TIMER_VALUE);
+ writel(TIMER_CTRL_32BIT | TIMER_CTRL_ENABLE | TIMER_CTRL_PERIODIC,
+ clksrc_base + TIMER_CTRL);
+
++ clocksource_register_khz(cs, TIMER_FREQ_KHZ);
+}
+
+
+static void __iomem *clkevt_base;
+
+/*
+ * IRQ handler for the timer
+ */
+static irqreturn_t sp804_timer_interrupt(int irq, void *dev_id)
+{
+ struct clock_event_device *evt = dev_id;
+
+ /* clear the interrupt */
+ writel(1, clkevt_base + TIMER_INTCLR);
+
+ evt->event_handler(evt);
+
+ return IRQ_HANDLED;
+}
+
+static void sp804_set_mode(enum clock_event_mode mode,
+ struct clock_event_device *evt)
+{
+ unsigned long ctrl = TIMER_CTRL_32BIT | TIMER_CTRL_IE;
+
+ writel(ctrl, clkevt_base + TIMER_CTRL);
+
+ switch (mode) {
+ case CLOCK_EVT_MODE_PERIODIC:
+ writel(TIMER_RELOAD, clkevt_base + TIMER_LOAD);
+ ctrl |= TIMER_CTRL_PERIODIC | TIMER_CTRL_ENABLE;
+ break;
+
+ case CLOCK_EVT_MODE_ONESHOT:
+ /* period set, and timer enabled in 'next_event' hook */
+ ctrl |= TIMER_CTRL_ONESHOT;
+ break;
+
+ case CLOCK_EVT_MODE_UNUSED:
+ case CLOCK_EVT_MODE_SHUTDOWN:
+ default:
+ break;
+ }
+
+ writel(ctrl, clkevt_base + TIMER_CTRL);
+}
+
+static int sp804_set_next_event(unsigned long next,
+ struct clock_event_device *evt)
+{
+ unsigned long ctrl = readl(clkevt_base + TIMER_CTRL);
+
+ writel(next, clkevt_base + TIMER_LOAD);
+ writel(ctrl | TIMER_CTRL_ENABLE, clkevt_base + TIMER_CTRL);
+
+ return 0;
+}
+
+static struct clock_event_device sp804_clockevent = {
+ .name = "timer0",
+ .shift = 32,
+ .features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT,
+ .set_mode = sp804_set_mode,
+ .set_next_event = sp804_set_next_event,
+ .rating = 300,
+ .cpumask = cpu_all_mask,
+};
+
+static struct irqaction sp804_timer_irq = {
+ .name = "timer",
+ .flags = IRQF_DISABLED | IRQF_TIMER | IRQF_IRQPOLL,
+ .handler = sp804_timer_interrupt,
+ .dev_id = &sp804_clockevent,
+};
+
+void __init sp804_clockevents_init(void __iomem *base, unsigned int timer_irq)
+{
+ struct clock_event_device *evt = &sp804_clockevent;
+
+ clkevt_base = base;
+
+ evt->irq = timer_irq;
+ evt->mult = div_sc(TIMER_FREQ_KHZ, NSEC_PER_MSEC, evt->shift);
+ evt->max_delta_ns = clockevent_delta2ns(0xffffffff, evt);
+ evt->min_delta_ns = clockevent_delta2ns(0xf, evt);
+
+ setup_irq(timer_irq, &sp804_timer_irq);
+ clockevents_register_device(evt);
+}
projects / cascardo / linux.git / commitdiff