--- /dev/null
+/*
+ * System timer for Freescale STMP37XX/STMP378X
+ *
+ * Embedded Alley Solutions, Inc <source@embeddedalley.com>
+ *
+ * Copyright 2009-2010 Freescale Semiconductor, Inc.
+ * Copyright 2008 Embedded Alley Solutions, Inc All Rights Reserved.
+ */
+
+/*
+ * The code contained herein is licensed under the GNU General Public
+ * License. You may obtain a copy of the GNU General Public License
+ * Version 2 or later at the following locations:
+ *
+ * http://www.opensource.org/licenses/gpl-license.html
+ * http://www.gnu.org/copyleft/gpl.html
+ */
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/spinlock.h>
+#include <linux/clocksource.h>
+#include <linux/clockchips.h>
+#include <linux/io.h>
+#include <linux/clk.h>
+#include <linux/irq.h>
+#include <linux/interrupt.h>
+
+#include <asm/mach/time.h>
+#include <mach/hardware.h>
+#include <mach/device.h>
+#include <mach/regs-timrot.h>
+
+#ifndef HW_TIMROT_TIMCOUNTn
+#define HW_TIMROT_TIMCOUNTn HW_TIMROT_RUNNING_COUNTn
+#endif
+static struct mxs_sys_timer *online_timer;
+
+static irqreturn_t
+mxs_nomatch_timer_interrupt(int irq, void *dev_id)
+{
+ struct clock_event_device *c = dev_id;
+
+ /* timer 0 */
+ if (__raw_readl(online_timer->base + HW_TIMROT_TIMCTRLn(0)) &
+ BM_TIMROT_TIMCTRLn_IRQ) {
+
+ __raw_writel(BM_TIMROT_TIMCTRLn_IRQ,
+ online_timer->base + HW_TIMROT_TIMCTRLn_CLR(0));
+ c->event_handler(c);
+ }
+
+ /* timer 1 */
+ else if (__raw_readl(online_timer->base + HW_TIMROT_TIMCTRLn(1))
+ & BM_TIMROT_TIMCTRLn_IRQ) {
+ __raw_writel(BM_TIMROT_TIMCTRLn_IRQ,
+ online_timer->base + HW_TIMROT_TIMCTRLn_CLR(1));
+ __raw_writel(BM_TIMROT_TIMCTRLn_IRQ_EN,
+ online_timer->base + HW_TIMROT_TIMCTRLn_CLR(1));
+ __raw_writel(0xFFFF,
+ online_timer->base + HW_TIMROT_TIMCOUNTn(1));
+ }
+
+ return IRQ_HANDLED;
+}
+
+static cycle_t mxs_nomatch_clock_read(struct clocksource *cs)
+{
+ return ~((__raw_readl(online_timer->base + HW_TIMROT_TIMCOUNTn(1))
+ & 0xFFFF0000) >> 16);
+}
+
+static int
+mxs_nomatch_timrot_set_next_event(unsigned long delta,
+ struct clock_event_device *dev)
+{
+ /* reload the timer */
+ __raw_writel(delta, online_timer->base + HW_TIMROT_TIMCOUNTn(0));
+ return 0;
+}
+
+static void
+mxs_nomatch_timrot_set_mode(enum clock_event_mode mode,
+ struct clock_event_device *dev)
+{
+}
+
+static struct clock_event_device ckevt_timrot = {
+ .name = "timrot",
+ .features = CLOCK_EVT_FEAT_ONESHOT,
+ .shift = 32,
+ .set_next_event = mxs_nomatch_timrot_set_next_event,
+ .set_mode = mxs_nomatch_timrot_set_mode,
+};
+
+static struct clocksource cksrc_mxs_nomatch = {
+ .name = "mxs clock source",
+ .rating = 250,
+ .read = mxs_nomatch_clock_read,
+ .mask = CLOCKSOURCE_MASK(16),
+ .shift = 10,
+ .flags = CLOCK_SOURCE_IS_CONTINUOUS,
+};
+
+static struct irqaction mxs_nomatch_timer_irq = {
+ .name = "mxs_nomatch_timer",
+ .flags = IRQF_DISABLED | IRQF_TIMER,
+ .handler = mxs_nomatch_timer_interrupt,
+ .dev_id = &ckevt_timrot,
+};
+
+
+/*
+ * Set up timer interrupt, and return the current time in seconds.
+ */
+void mxs_nomatch_timer_init(struct mxs_sys_timer *timer)
+{
+
+ if (online_timer)
+ return;
+
+ online_timer = timer;
+
+ cksrc_mxs_nomatch.mult = clocksource_hz2mult(clk_get_rate(timer->clk),
+ cksrc_mxs_nomatch.shift);
+ ckevt_timrot.mult = div_sc(clk_get_rate(timer->clk), NSEC_PER_SEC,
+ ckevt_timrot.shift);
+ ckevt_timrot.min_delta_ns = clockevent_delta2ns(2, &ckevt_timrot);
+ ckevt_timrot.max_delta_ns = clockevent_delta2ns(0xFFF, &ckevt_timrot);
+ ckevt_timrot.cpumask = cpumask_of(0);
+
+ /* clear two timers */
+ __raw_writel(0, online_timer->base + HW_TIMROT_TIMCOUNTn(0));
+ __raw_writel(0, online_timer->base + HW_TIMROT_TIMCOUNTn(1));
+
+ /* configure them */
+ __raw_writel(
+ (8 << BP_TIMROT_TIMCTRLn_SELECT) | /* 32 kHz */
+ BM_TIMROT_TIMCTRLn_RELOAD |
+ BM_TIMROT_TIMCTRLn_UPDATE |
+ BM_TIMROT_TIMCTRLn_IRQ_EN,
+ online_timer->base + HW_TIMROT_TIMCTRLn(0));
+ __raw_writel(
+ (8 << BP_TIMROT_TIMCTRLn_SELECT) | /* 32 kHz */
+ BM_TIMROT_TIMCTRLn_RELOAD |
+ BM_TIMROT_TIMCTRLn_UPDATE |
+ BM_TIMROT_TIMCTRLn_IRQ_EN,
+ online_timer->base + HW_TIMROT_TIMCTRLn(1));
+
+ __raw_writel(clk_get_rate(timer->clk) / HZ - 1,
+ online_timer->base + HW_TIMROT_TIMCOUNTn(0));
+ __raw_writel(0xFFFF, online_timer->base + HW_TIMROT_TIMCOUNTn(1));
+
+ setup_irq(IRQ_TIMER0, &mxs_nomatch_timer_irq);
+
+ clocksource_register(&cksrc_mxs_nomatch);
+ clockevents_register_device(&ckevt_timrot);
+}
+
+#ifdef CONFIG_PM
+
+void mxs_nomatch_suspend_timer(void)
+{
+ __raw_writel(BM_TIMROT_TIMCTRLn_IRQ_EN | BM_TIMROT_TIMCTRLn_IRQ,
+ online_timer->base + HW_TIMROT_TIMCTRLn_CLR(0));
+ __raw_writel(BM_TIMROT_ROTCTRL_CLKGATE,
+ online_timer->base + HW_TIMROT_ROTCTRL_SET);
+}
+
+void mxs_nomatch_resume_timer(void)
+{
+ __raw_writel(BM_TIMROT_ROTCTRL_SFTRST | BM_TIMROT_ROTCTRL_CLKGATE,
+ online_timer->base + HW_TIMROT_ROTCTRL_CLR);
+ __raw_writel(
+ 8 << BP_TIMROT_TIMCTRLn_SELECT | /* 32 kHz */
+ BM_TIMROT_TIMCTRLn_RELOAD |
+ BM_TIMROT_TIMCTRLn_UPDATE |
+ BM_TIMROT_TIMCTRLn_IRQ_EN,
+ online_timer->base + HW_TIMROT_TIMCTRLn(0));
+ __raw_writel(
+ 8 << BP_TIMROT_TIMCTRLn_SELECT | /* 32 kHz */
+ BM_TIMROT_TIMCTRLn_RELOAD |
+ BM_TIMROT_TIMCTRLn_UPDATE |
+ BM_TIMROT_TIMCTRLn_IRQ_EN,
+ online_timer->base + HW_TIMROT_TIMCTRLn(1));
+ __raw_writel(clk_get_rate(online_timer->clk) / HZ - 1,
+ online_timer->base + HW_TIMROT_TIMCOUNTn(0));
+ __raw_writel(0xFFFF, online_timer->base + HW_TIMROT_TIMCOUNTn(1));
+}
+
+#else
+
+#define mxs_nomatch_suspend_timer NULL
+#define mxs_nomatch_resume_timer NULL
+
+#endif /* CONFIG_PM */
projects / linux-imx.git / blobdiff