1 files changed, 342 insertions, 0 deletions

diff --git a/arch/arm/mach-omap2/timer.c b/arch/arm/mach-omap2/timer.c
new file mode 100644
index 000000000000..e9640728239b
--- /dev/null
+++ b/arch/arm/mach-omap2/timer.c
@@ -0,0 +1,342 @@
+/*
+ * linux/arch/arm/mach-omap2/timer.c
+ *
+ * OMAP2 GP timer support.
+ *
+ * Copyright (C) 2009 Nokia Corporation
+ *
+ * Update to use new clocksource/clockevent layers
+ * Author: Kevin Hilman, MontaVista Software, Inc. <source@mvista.com>
+ * Copyright (C) 2007 MontaVista Software, Inc.
+ *
+ * Original driver:
+ * Copyright (C) 2005 Nokia Corporation
+ * Author: Paul Mundt <paul.mundt@nokia.com>
+ *         Juha Yrjölä <juha.yrjola@nokia.com>
+ * OMAP Dual-mode timer framework support by Timo Teras
+ *
+ * Some parts based off of TI's 24xx code:
+ *
+ * Copyright (C) 2004-2009 Texas Instruments, Inc.
+ *
+ * Roughly modelled after the OMAP1 MPU timer code.
+ * Added OMAP4 support - Santosh Shilimkar <santosh.shilimkar@ti.com>
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ */
+#include <linux/init.h>
+#include <linux/time.h>
+#include <linux/interrupt.h>
+#include <linux/err.h>
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/irq.h>
+#include <linux/clocksource.h>
+#include <linux/clockchips.h>
+
+#include <asm/mach/time.h>
+#include <plat/dmtimer.h>
+#include <asm/localtimer.h>
+#include <asm/sched_clock.h>
+#include <plat/common.h>
+#include <plat/omap_hwmod.h>
+
+/* Parent clocks, eventually these will come from the clock framework */
+
+#define OMAP2_MPU_SOURCE        "sys_ck"
+#define OMAP3_MPU_SOURCE        OMAP2_MPU_SOURCE
+#define OMAP4_MPU_SOURCE        "sys_clkin_ck"
+#define OMAP2_32K_SOURCE        "func_32k_ck"
+#define OMAP3_32K_SOURCE        "omap_32k_fck"
+#define OMAP4_32K_SOURCE        "sys_32k_ck"
+
+#ifdef CONFIG_OMAP_32K_TIMER
+#define OMAP2_CLKEV_SOURCE      OMAP2_32K_SOURCE
+#define OMAP3_CLKEV_SOURCE      OMAP3_32K_SOURCE
+#define OMAP4_CLKEV_SOURCE      OMAP4_32K_SOURCE
+#define OMAP3_SECURE_TIMER      12
+#else
+#define OMAP2_CLKEV_SOURCE      OMAP2_MPU_SOURCE
+#define OMAP3_CLKEV_SOURCE      OMAP3_MPU_SOURCE
+#define OMAP4_CLKEV_SOURCE      OMAP4_MPU_SOURCE
+#define OMAP3_SECURE_TIMER      1
+#endif
+
+/* MAX_GPTIMER_ID: number of GPTIMERs on the chip */
+#define MAX_GPTIMER_ID          12
+
+u32 sys_timer_reserved;
+
+/* Clockevent code */
+
+static struct omap_dm_timer clkev;
+static struct clock_event_device clockevent_gpt;
+
+static irqreturn_t omap2_gp_timer_interrupt(int irq, void *dev_id)
+{
+        struct clock_event_device *evt = &clockevent_gpt;
+
+        __omap_dm_timer_write_status(clkev.io_base, OMAP_TIMER_INT_OVERFLOW);
+
+        evt->event_handler(evt);
+        return IRQ_HANDLED;
+}
+
+static struct irqaction omap2_gp_timer_irq = {
+        .name           = "gp timer",
+        .flags          = IRQF_DISABLED | IRQF_TIMER | IRQF_IRQPOLL,
+        .handler        = omap2_gp_timer_interrupt,
+};
+
+static int omap2_gp_timer_set_next_event(unsigned long cycles,
+                                         struct clock_event_device *evt)
+{
+        __omap_dm_timer_load_start(clkev.io_base, OMAP_TIMER_CTRL_ST,
+                                                0xffffffff - cycles, 1);
+
+        return 0;
+}
+
+static void omap2_gp_timer_set_mode(enum clock_event_mode mode,
+                                    struct clock_event_device *evt)
+{
+        u32 period;
+
+        __omap_dm_timer_stop(clkev.io_base, 1, clkev.rate);
+
+        switch (mode) {
+        case CLOCK_EVT_MODE_PERIODIC:
+                period = clkev.rate / HZ;
+                period -= 1;
+                /* Looks like we need to first set the load value separately */
+                __omap_dm_timer_write(clkev.io_base, OMAP_TIMER_LOAD_REG,
+                                        0xffffffff - period, 1);
+                __omap_dm_timer_load_start(clkev.io_base,
+                                        OMAP_TIMER_CTRL_AR | OMAP_TIMER_CTRL_ST,
+                                                0xffffffff - period, 1);
+                break;
+        case CLOCK_EVT_MODE_ONESHOT:
+                break;
+        case CLOCK_EVT_MODE_UNUSED:
+        case CLOCK_EVT_MODE_SHUTDOWN:
+        case CLOCK_EVT_MODE_RESUME:
+                break;
+        }
+}
+
+static struct clock_event_device clockevent_gpt = {
+        .name           = "gp timer",
+        .features       = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT,
+        .shift          = 32,
+        .set_next_event = omap2_gp_timer_set_next_event,
+        .set_mode       = omap2_gp_timer_set_mode,
+};
+
+static int __init omap_dm_timer_init_one(struct omap_dm_timer *timer,
+                                                int gptimer_id,
+                                                const char *fck_source)
+{
+        char name[10]; /* 10 = sizeof("gptXX_Xck0") */
+        struct omap_hwmod *oh;
+        size_t size;
+        int res = 0;
+
+        sprintf(name, "timer%d", gptimer_id);
+        omap_hwmod_setup_one(name);
+        oh = omap_hwmod_lookup(name);
+        if (!oh)
+                return -ENODEV;
+
+        timer->irq = oh->mpu_irqs[0].irq;
+        timer->phys_base = oh->slaves[0]->addr->pa_start;
+        size = oh->slaves[0]->addr->pa_end - timer->phys_base;
+
+        /* Static mapping, never released */
+        timer->io_base = ioremap(timer->phys_base, size);
+        if (!timer->io_base)
+                return -ENXIO;
+
+        /* After the dmtimer is using hwmod these clocks won't be needed */
+        sprintf(name, "gpt%d_fck", gptimer_id);
+        timer->fclk = clk_get(NULL, name);
+        if (IS_ERR(timer->fclk))
+                return -ENODEV;
+
+        sprintf(name, "gpt%d_ick", gptimer_id);
+        timer->iclk = clk_get(NULL, name);
+        if (IS_ERR(timer->iclk)) {
+                clk_put(timer->fclk);
+                return -ENODEV;
+        }
+
+        omap_hwmod_enable(oh);
+
+        sys_timer_reserved |= (1 << (gptimer_id - 1));
+
+        if (gptimer_id != 12) {
+                struct clk *src;
+
+                src = clk_get(NULL, fck_source);
+                if (IS_ERR(src)) {
+                        res = -EINVAL;
+                } else {
+                        res = __omap_dm_timer_set_source(timer->fclk, src);
+                        if (IS_ERR_VALUE(res))
+                                pr_warning("%s: timer%i cannot set source\n",
+                                                __func__, gptimer_id);
+                        clk_put(src);
+                }
+        }
+        __omap_dm_timer_reset(timer->io_base, 1, 1);
+        timer->posted = 1;
+
+        timer->rate = clk_get_rate(timer->fclk);
+
+        timer->reserved = 1;
+
+        return res;
+}
+
+static void __init omap2_gp_clockevent_init(int gptimer_id,
+                                                const char *fck_source)
+{
+        int res;
+
+        res = omap_dm_timer_init_one(&clkev, gptimer_id, fck_source);
+        BUG_ON(res);
+
+        omap2_gp_timer_irq.dev_id = (void *)&clkev;
+        setup_irq(clkev.irq, &omap2_gp_timer_irq);
+
+        __omap_dm_timer_int_enable(clkev.io_base, OMAP_TIMER_INT_OVERFLOW);
+
+        clockevent_gpt.mult = div_sc(clkev.rate, NSEC_PER_SEC,
+                                     clockevent_gpt.shift);
+        clockevent_gpt.max_delta_ns =
+                clockevent_delta2ns(0xffffffff, &clockevent_gpt);
+        clockevent_gpt.min_delta_ns =
+                clockevent_delta2ns(3, &clockevent_gpt);
+                /* Timer internal resynch latency. */
+
+        clockevent_gpt.cpumask = cpumask_of(0);
+        clockevents_register_device(&clockevent_gpt);
+
+        pr_info("OMAP clockevent source: GPTIMER%d at %lu Hz\n",
+                gptimer_id, clkev.rate);
+}
+
+/* Clocksource code */
+
+#ifdef CONFIG_OMAP_32K_TIMER
+/*
+ * When 32k-timer is enabled, don't use GPTimer for clocksource
+ * instead, just leave default clocksource which uses the 32k
+ * sync counter.  See clocksource setup in plat-omap/counter_32k.c
+ */
+
+static void __init omap2_gp_clocksource_init(int unused, const char *dummy)
+{
+        omap_init_clocksource_32k();
+}
+
+#else
+
+static struct omap_dm_timer clksrc;
+
+/*
+ * clocksource
+ */
+static DEFINE_CLOCK_DATA(cd);
+static cycle_t clocksource_read_cycles(struct clocksource *cs)
+{
+        return (cycle_t)__omap_dm_timer_read_counter(clksrc.io_base, 1);
+}
+
+static struct clocksource clocksource_gpt = {
+        .name           = "gp timer",
+        .rating         = 300,
+        .read           = clocksource_read_cycles,
+        .mask           = CLOCKSOURCE_MASK(32),
+        .flags          = CLOCK_SOURCE_IS_CONTINUOUS,
+};
+
+static void notrace dmtimer_update_sched_clock(void)
+{
+        u32 cyc;
+
+        cyc = __omap_dm_timer_read_counter(clksrc.io_base, 1);
+
+        update_sched_clock(&cd, cyc, (u32)~0);
+}
+
+unsigned long long notrace sched_clock(void)
+{
+        u32 cyc = 0;
+
+        if (clksrc.reserved)
+                cyc = __omap_dm_timer_read_counter(clksrc.io_base, 1);
+
+        return cyc_to_sched_clock(&cd, cyc, (u32)~0);
+}
+
+/* Setup free-running counter for clocksource */
+static void __init omap2_gp_clocksource_init(int gptimer_id,
+                                                const char *fck_source)
+{
+        int res;
+
+        res = omap_dm_timer_init_one(&clksrc, gptimer_id, fck_source);
+        BUG_ON(res);
+
+        pr_info("OMAP clocksource: GPTIMER%d at %lu Hz\n",
+                gptimer_id, clksrc.rate);
+
+        __omap_dm_timer_load_start(clksrc.io_base, OMAP_TIMER_CTRL_ST, 0, 1);
+        init_sched_clock(&cd, dmtimer_update_sched_clock, 32, clksrc.rate);
+
+        if (clocksource_register_hz(&clocksource_gpt, clksrc.rate))
+                pr_err("Could not register clocksource %s\n",
+                        clocksource_gpt.name);
+}
+#endif
+
+#define OMAP_SYS_TIMER_INIT(name, clkev_nr, clkev_src,                  \
+                                clksrc_nr, clksrc_src)                  \
+static void __init omap##name##_timer_init(void)                        \
+{                                                                       \
+        omap2_gp_clockevent_init((clkev_nr), clkev_src);                \
+        omap2_gp_clocksource_init((clksrc_nr), clksrc_src);             \
+}
+
+#define OMAP_SYS_TIMER(name)                                            \
+struct sys_timer omap##name##_timer = {                                 \
+        .init   = omap##name##_timer_init,                              \
+};
+
+#ifdef CONFIG_ARCH_OMAP2
+OMAP_SYS_TIMER_INIT(2, 1, OMAP2_CLKEV_SOURCE, 2, OMAP2_MPU_SOURCE)
+OMAP_SYS_TIMER(2)
+#endif
+
+#ifdef CONFIG_ARCH_OMAP3
+OMAP_SYS_TIMER_INIT(3, 1, OMAP3_CLKEV_SOURCE, 2, OMAP3_MPU_SOURCE)
+OMAP_SYS_TIMER(3)
+OMAP_SYS_TIMER_INIT(3_secure, OMAP3_SECURE_TIMER, OMAP3_CLKEV_SOURCE,
+                        2, OMAP3_MPU_SOURCE)
+OMAP_SYS_TIMER(3_secure)
+#endif
+
+#ifdef CONFIG_ARCH_OMAP4
+static void __init omap4_timer_init(void)
+{
+#ifdef CONFIG_LOCAL_TIMERS
+        twd_base = ioremap(OMAP44XX_LOCAL_TWD_BASE, SZ_256);
+        BUG_ON(!twd_base);
+#endif
+        omap2_gp_clockevent_init(1, OMAP4_CLKEV_SOURCE);
+        omap2_gp_clocksource_init(2, OMAP4_MPU_SOURCE);
+}
+OMAP_SYS_TIMER(4)
+#endif