1 files changed, 209 insertions, 0 deletions

diff --git a/arch/arm/mach-omap1/timer32k.c b/arch/arm/mach-omap1/timer32k.c
new file mode 100644
index 000000000000..fbbdb806c95a
--- /dev/null
+++ b/arch/arm/mach-omap1/timer32k.c
@@ -0,0 +1,209 @@
+/*
+ * linux/arch/arm/mach-omap1/timer32k.c
+ *
+ * OMAP 32K Timer
+ *
+ * Copyright (C) 2004 - 2005 Nokia Corporation
+ * Partial timer rewrite and additional dynamic tick timer support by
+ * Tony Lindgen <tony@atomide.com> and
+ * Tuukka Tikkanen <tuukka.tikkanen@elektrobit.com>
+ * OMAP Dual-mode timer framework support by Timo Teras
+ *
+ * MPU timer code based on the older MPU timer code for OMAP
+ * Copyright (C) 2000 RidgeRun, Inc.
+ * Author: Greg Lonnon <glonnon@ridgerun.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 SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
+ * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
+ * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * 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.,
+ * 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/sched.h>
+#include <linux/spinlock.h>
+#include <linux/err.h>
+#include <linux/clk.h>
+#include <linux/clocksource.h>
+#include <linux/clockchips.h>
+
+#include <asm/system.h>
+#include <asm/hardware.h>
+#include <asm/io.h>
+#include <asm/leds.h>
+#include <asm/irq.h>
+#include <asm/mach/irq.h>
+#include <asm/mach/time.h>
+#include <asm/arch/dmtimer.h>
+
+struct sys_timer omap_timer;
+
+/*
+ * ---------------------------------------------------------------------------
+ * 32KHz OS timer
+ *
+ * This currently works only on 16xx, as 1510 does not have the continuous
+ * 32KHz synchronous timer. The 32KHz synchronous timer is used to keep track
+ * of time in addition to the 32KHz OS timer. Using only the 32KHz OS timer
+ * on 1510 would be possible, but the timer would not be as accurate as
+ * with the 32KHz synchronized timer.
+ * ---------------------------------------------------------------------------
+ */
+
+#if defined(CONFIG_ARCH_OMAP16XX)
+#define TIMER_32K_SYNCHRONIZED          0xfffbc410
+#else
+#error OMAP 32KHz timer does not currently work on 15XX!
+#endif
+
+/* 16xx specific defines */
+#define OMAP1_32K_TIMER_BASE            0xfffb9000
+#define OMAP1_32K_TIMER_CR              0x08
+#define OMAP1_32K_TIMER_TVR             0x00
+#define OMAP1_32K_TIMER_TCR             0x04
+
+#define OMAP_32K_TICKS_PER_SEC          (32768)
+
+/*
+ * TRM says 1 / HZ = ( TVR + 1) / 32768, so TRV = (32768 / HZ) - 1
+ * so with HZ = 128, TVR = 255.
+ */
+#define OMAP_32K_TIMER_TICK_PERIOD      ((OMAP_32K_TICKS_PER_SEC / HZ) - 1)
+
+#define JIFFIES_TO_HW_TICKS(nr_jiffies, clock_rate)                     \
+                                (((nr_jiffies) * (clock_rate)) / HZ)
+
+static inline void omap_32k_timer_write(int val, int reg)
+{
+        omap_writew(val, OMAP1_32K_TIMER_BASE + reg);
+}
+
+static inline unsigned long omap_32k_timer_read(int reg)
+{
+        return omap_readl(OMAP1_32K_TIMER_BASE + reg) & 0xffffff;
+}
+
+static inline void omap_32k_timer_start(unsigned long load_val)
+{
+        if (!load_val)
+                load_val = 1;
+        omap_32k_timer_write(load_val, OMAP1_32K_TIMER_TVR);
+        omap_32k_timer_write(0x0f, OMAP1_32K_TIMER_CR);
+}
+
+static inline void omap_32k_timer_stop(void)
+{
+        omap_32k_timer_write(0x0, OMAP1_32K_TIMER_CR);
+}
+
+#define omap_32k_timer_ack_irq()
+
+static int omap_32k_timer_set_next_event(unsigned long delta,
+                                         struct clock_event_device *dev)
+{
+        omap_32k_timer_start(delta);
+
+        return 0;
+}
+
+static void omap_32k_timer_set_mode(enum clock_event_mode mode,
+                                    struct clock_event_device *evt)
+{
+        omap_32k_timer_stop();
+
+        switch (mode) {
+        case CLOCK_EVT_MODE_PERIODIC:
+                omap_32k_timer_start(OMAP_32K_TIMER_TICK_PERIOD);
+                break;
+        case CLOCK_EVT_MODE_ONESHOT:
+        case CLOCK_EVT_MODE_UNUSED:
+        case CLOCK_EVT_MODE_SHUTDOWN:
+                break;
+        case CLOCK_EVT_MODE_RESUME:
+                break;
+        }
+}
+
+static struct clock_event_device clockevent_32k_timer = {
+        .name           = "32k-timer",
+        .features       = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT,
+        .shift          = 32,
+        .set_next_event = omap_32k_timer_set_next_event,
+        .set_mode       = omap_32k_timer_set_mode,
+};
+
+/*
+ * The 32KHz synchronized timer is an additional timer on 16xx.
+ * It is always running.
+ */
+static inline unsigned long omap_32k_sync_timer_read(void)
+{
+        return omap_readl(TIMER_32K_SYNCHRONIZED);
+}
+
+static irqreturn_t omap_32k_timer_interrupt(int irq, void *dev_id)
+{
+        struct clock_event_device *evt = &clockevent_32k_timer;
+        omap_32k_timer_ack_irq();
+
+        evt->event_handler(evt);
+
+        return IRQ_HANDLED;
+}
+
+static struct irqaction omap_32k_timer_irq = {
+        .name           = "32KHz timer",
+        .flags          = IRQF_DISABLED | IRQF_TIMER | IRQF_IRQPOLL,
+        .handler        = omap_32k_timer_interrupt,
+};
+
+static __init void omap_init_32k_timer(void)
+{
+        setup_irq(INT_OS_TIMER, &omap_32k_timer_irq);
+
+        clockevent_32k_timer.mult = div_sc(OMAP_32K_TICKS_PER_SEC,
+                                           NSEC_PER_SEC,
+                                           clockevent_32k_timer.shift);
+        clockevent_32k_timer.max_delta_ns =
+                clockevent_delta2ns(0xfffffffe, &clockevent_32k_timer);
+        clockevent_32k_timer.min_delta_ns =
+                clockevent_delta2ns(1, &clockevent_32k_timer);
+
+        clockevent_32k_timer.cpumask = cpumask_of_cpu(0);
+        clockevents_register_device(&clockevent_32k_timer);
+}
+
+/*
+ * ---------------------------------------------------------------------------
+ * Timer initialization
+ * ---------------------------------------------------------------------------
+ */
+static void __init omap_timer_init(void)
+{
+#ifdef CONFIG_OMAP_DM_TIMER
+        omap_dm_timer_init();
+#endif
+        omap_init_32k_timer();
+}
+
+struct sys_timer omap_timer = {
+        .init           = omap_timer_init,
+};