--- /dev/null
- clockevents_calc_mult_shift(&clockevent, VT8500_TIMER_HZ, 4);
-
- /* copy-pasted from mach-msm; no idea */
- clockevent.max_delta_ns =
- clockevent_delta2ns(0xf0000000, &clockevent);
- clockevent.min_delta_ns = clockevent_delta2ns(4, &clockevent);
+ /*
+ * arch/arm/mach-vt8500/timer.c
+ *
+ * Copyright (C) 2012 Tony Prisk <linux@prisktech.co.nz>
+ * Copyright (C) 2010 Alexey Charkov <alchark@gmail.com>
+ *
+ * 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
+ */
+
+ /*
+ * This file is copied and modified from the original timer.c provided by
+ * Alexey Charkov. Minor changes have been made for Device Tree Support.
+ */
+
+ #include <linux/io.h>
+ #include <linux/irq.h>
+ #include <linux/interrupt.h>
+ #include <linux/clocksource.h>
+ #include <linux/clockchips.h>
+ #include <linux/delay.h>
+ #include <asm/mach/time.h>
+
+ #include <linux/of.h>
+ #include <linux/of_address.h>
+ #include <linux/of_irq.h>
+
+ #define VT8500_TIMER_OFFSET 0x0100
+ #define VT8500_TIMER_HZ 3000000
+ #define TIMER_MATCH_VAL 0x0000
+ #define TIMER_COUNT_VAL 0x0010
+ #define TIMER_STATUS_VAL 0x0014
+ #define TIMER_IER_VAL 0x001c /* interrupt enable */
+ #define TIMER_CTRL_VAL 0x0020
+ #define TIMER_AS_VAL 0x0024 /* access status */
+ #define TIMER_COUNT_R_ACTIVE (1 << 5) /* not ready for read */
+ #define TIMER_COUNT_W_ACTIVE (1 << 4) /* not ready for write */
+ #define TIMER_MATCH_W_ACTIVE (1 << 0) /* not ready for write */
+
+ #define msecs_to_loops(t) (loops_per_jiffy / 1000 * HZ * t)
+
+ static void __iomem *regbase;
+
+ static cycle_t vt8500_timer_read(struct clocksource *cs)
+ {
+ int loops = msecs_to_loops(10);
+ writel(3, regbase + TIMER_CTRL_VAL);
+ while ((readl((regbase + TIMER_AS_VAL)) & TIMER_COUNT_R_ACTIVE)
+ && --loops)
+ cpu_relax();
+ return readl(regbase + TIMER_COUNT_VAL);
+ }
+
+ static struct clocksource clocksource = {
+ .name = "vt8500_timer",
+ .rating = 200,
+ .read = vt8500_timer_read,
+ .mask = CLOCKSOURCE_MASK(32),
+ .flags = CLOCK_SOURCE_IS_CONTINUOUS,
+ };
+
+ static int vt8500_timer_set_next_event(unsigned long cycles,
+ struct clock_event_device *evt)
+ {
+ int loops = msecs_to_loops(10);
+ cycle_t alarm = clocksource.read(&clocksource) + cycles;
+ while ((readl(regbase + TIMER_AS_VAL) & TIMER_MATCH_W_ACTIVE)
+ && --loops)
+ cpu_relax();
+ writel((unsigned long)alarm, regbase + TIMER_MATCH_VAL);
+
+ if ((signed)(alarm - clocksource.read(&clocksource)) <= 16)
+ return -ETIME;
+
+ writel(1, regbase + TIMER_IER_VAL);
+
+ return 0;
+ }
+
+ static void vt8500_timer_set_mode(enum clock_event_mode mode,
+ struct clock_event_device *evt)
+ {
+ switch (mode) {
+ case CLOCK_EVT_MODE_RESUME:
+ case CLOCK_EVT_MODE_PERIODIC:
+ break;
+ case CLOCK_EVT_MODE_ONESHOT:
+ case CLOCK_EVT_MODE_UNUSED:
+ case CLOCK_EVT_MODE_SHUTDOWN:
+ writel(readl(regbase + TIMER_CTRL_VAL) | 1,
+ regbase + TIMER_CTRL_VAL);
+ writel(0, regbase + TIMER_IER_VAL);
+ break;
+ }
+ }
+
+ static struct clock_event_device clockevent = {
+ .name = "vt8500_timer",
+ .features = CLOCK_EVT_FEAT_ONESHOT,
+ .rating = 200,
+ .set_next_event = vt8500_timer_set_next_event,
+ .set_mode = vt8500_timer_set_mode,
+ };
+
+ static irqreturn_t vt8500_timer_interrupt(int irq, void *dev_id)
+ {
+ struct clock_event_device *evt = dev_id;
+ writel(0xf, regbase + TIMER_STATUS_VAL);
+ evt->event_handler(evt);
+
+ return IRQ_HANDLED;
+ }
+
+ static struct irqaction irq = {
+ .name = "vt8500_timer",
+ .flags = IRQF_DISABLED | IRQF_TIMER | IRQF_IRQPOLL,
+ .handler = vt8500_timer_interrupt,
+ .dev_id = &clockevent,
+ };
+
+ static struct of_device_id vt8500_timer_ids[] = {
+ { .compatible = "via,vt8500-timer" },
+ { }
+ };
+
+ void __init vt8500_timer_init(void)
+ {
+ struct device_node *np;
+ int timer_irq;
+
+ np = of_find_matching_node(NULL, vt8500_timer_ids);
+ if (!np) {
+ pr_err("%s: Timer description missing from Device Tree\n",
+ __func__);
+ return;
+ }
+ regbase = of_iomap(np, 0);
+ if (!regbase) {
+ pr_err("%s: Missing iobase description in Device Tree\n",
+ __func__);
+ of_node_put(np);
+ return;
+ }
+ timer_irq = irq_of_parse_and_map(np, 0);
+ if (!timer_irq) {
+ pr_err("%s: Missing irq description in Device Tree\n",
+ __func__);
+ of_node_put(np);
+ return;
+ }
+
+ writel(1, regbase + TIMER_CTRL_VAL);
+ writel(0xf, regbase + TIMER_STATUS_VAL);
+ writel(~0, regbase + TIMER_MATCH_VAL);
+
+ if (clocksource_register_hz(&clocksource, VT8500_TIMER_HZ))
+ pr_err("%s: vt8500_timer_init: clocksource_register failed for %s\n",
+ __func__, clocksource.name);
+
- clockevents_register_device(&clockevent);
+ clockevent.cpumask = cpumask_of(0);
+
+ if (setup_irq(timer_irq, &irq))
+ pr_err("%s: setup_irq failed for %s\n", __func__,
+ clockevent.name);
++ clockevents_config_and_register(&clockevent, VT8500_TIMER_HZ,
++ 4, 0xf0000000);
+ }
+
projects / deliverable / linux.git / commitdiff
