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-rw-r--r--target/linux/xburst/patches-2.6.35/006-clocksource.patch165
1 files changed, 165 insertions, 0 deletions
diff --git a/target/linux/xburst/patches-2.6.35/006-clocksource.patch b/target/linux/xburst/patches-2.6.35/006-clocksource.patch
new file mode 100644
index 0000000000..dfb31c1fe9
--- /dev/null
+++ b/target/linux/xburst/patches-2.6.35/006-clocksource.patch
@@ -0,0 +1,165 @@
+From ebf176a38105200dca51a96ad1535c8d56235653 Mon Sep 17 00:00:00 2001
+From: Lars-Peter Clausen <lars@metafoo.de>
+Date: Sat, 19 Jun 2010 04:08:10 +0000
+Subject: [PATCH] MIPS: JZ4740: Add clocksource/clockevent support.
+
+Add clocksource and clockevent support for the timer/counter unit on
+JZ4740 SoCs.
+
+Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
+Cc: linux-mips@linux-mips.org
+Cc: linux-kernel@vger.kernel.org
+Patchwork: https://patchwork.linux-mips.org/patch/1397/
+Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
+---
+ arch/mips/jz4740/time.c | 144 +++++++++++++++++++++++++++++++++++++++++++++++
+ 1 files changed, 144 insertions(+), 0 deletions(-)
+ create mode 100644 arch/mips/jz4740/time.c
+
+--- /dev/null
++++ b/arch/mips/jz4740/time.c
+@@ -0,0 +1,144 @@
++/*
++ * Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de>
++ * JZ4740 platform time support
++ *
++ * 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.
++ *
++ * 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/interrupt.h>
++#include <linux/kernel.h>
++#include <linux/time.h>
++
++#include <linux/clockchips.h>
++
++#include <asm/mach-jz4740/irq.h>
++#include <asm/time.h>
++
++#include "clock.h"
++#include "timer.h"
++
++#define TIMER_CLOCKEVENT 0
++#define TIMER_CLOCKSOURCE 1
++
++static uint16_t jz4740_jiffies_per_tick;
++
++static cycle_t jz4740_clocksource_read(struct clocksource *cs)
++{
++ return jz4740_timer_get_count(TIMER_CLOCKSOURCE);
++}
++
++static struct clocksource jz4740_clocksource = {
++ .name = "jz4740-timer",
++ .rating = 200,
++ .read = jz4740_clocksource_read,
++ .mask = CLOCKSOURCE_MASK(16),
++ .flags = CLOCK_SOURCE_IS_CONTINUOUS,
++};
++
++static irqreturn_t jz4740_clockevent_irq(int irq, void *devid)
++{
++ struct clock_event_device *cd = devid;
++
++ jz4740_timer_ack_full(TIMER_CLOCKEVENT);
++
++ if (cd->mode != CLOCK_EVT_MODE_PERIODIC)
++ jz4740_timer_disable(TIMER_CLOCKEVENT);
++
++ cd->event_handler(cd);
++
++ return IRQ_HANDLED;
++}
++
++static void jz4740_clockevent_set_mode(enum clock_event_mode mode,
++ struct clock_event_device *cd)
++{
++ switch (mode) {
++ case CLOCK_EVT_MODE_PERIODIC:
++ jz4740_timer_set_count(TIMER_CLOCKEVENT, 0);
++ jz4740_timer_set_period(TIMER_CLOCKEVENT, jz4740_jiffies_per_tick);
++ case CLOCK_EVT_MODE_RESUME:
++ jz4740_timer_irq_full_enable(TIMER_CLOCKEVENT);
++ jz4740_timer_enable(TIMER_CLOCKEVENT);
++ break;
++ case CLOCK_EVT_MODE_ONESHOT:
++ case CLOCK_EVT_MODE_SHUTDOWN:
++ jz4740_timer_disable(TIMER_CLOCKEVENT);
++ break;
++ default:
++ break;
++ }
++}
++
++static int jz4740_clockevent_set_next(unsigned long evt,
++ struct clock_event_device *cd)
++{
++ jz4740_timer_set_count(TIMER_CLOCKEVENT, 0);
++ jz4740_timer_set_period(TIMER_CLOCKEVENT, evt);
++ jz4740_timer_enable(TIMER_CLOCKEVENT);
++
++ return 0;
++}
++
++static struct clock_event_device jz4740_clockevent = {
++ .name = "jz4740-timer",
++ .features = CLOCK_EVT_FEAT_PERIODIC,
++ .set_next_event = jz4740_clockevent_set_next,
++ .set_mode = jz4740_clockevent_set_mode,
++ .rating = 200,
++ .irq = JZ4740_IRQ_TCU0,
++};
++
++static struct irqaction timer_irqaction = {
++ .handler = jz4740_clockevent_irq,
++ .flags = IRQF_PERCPU | IRQF_TIMER,
++ .name = "jz4740-timerirq",
++ .dev_id = &jz4740_clockevent,
++};
++
++void __init plat_time_init(void)
++{
++ int ret;
++ uint32_t clk_rate;
++ uint16_t ctrl;
++
++ jz4740_timer_init();
++
++ clk_rate = jz4740_clock_bdata.ext_rate >> 4;
++ jz4740_jiffies_per_tick = DIV_ROUND_CLOSEST(clk_rate, HZ);
++
++ clockevent_set_clock(&jz4740_clockevent, clk_rate);
++ jz4740_clockevent.min_delta_ns = clockevent_delta2ns(100, &jz4740_clockevent);
++ jz4740_clockevent.max_delta_ns = clockevent_delta2ns(0xffff, &jz4740_clockevent);
++ jz4740_clockevent.cpumask = cpumask_of(0);
++
++ clockevents_register_device(&jz4740_clockevent);
++
++ clocksource_set_clock(&jz4740_clocksource, clk_rate);
++ ret = clocksource_register(&jz4740_clocksource);
++
++ if (ret)
++ printk(KERN_ERR "Failed to register clocksource: %d\n", ret);
++
++ setup_irq(JZ4740_IRQ_TCU0, &timer_irqaction);
++
++ ctrl = JZ_TIMER_CTRL_PRESCALE_16 | JZ_TIMER_CTRL_SRC_EXT;
++
++ jz4740_timer_set_ctrl(TIMER_CLOCKEVENT, ctrl);
++ jz4740_timer_set_ctrl(TIMER_CLOCKSOURCE, ctrl);
++
++ jz4740_timer_set_period(TIMER_CLOCKEVENT, jz4740_jiffies_per_tick);
++ jz4740_timer_irq_full_enable(TIMER_CLOCKEVENT);
++
++ jz4740_timer_set_period(TIMER_CLOCKSOURCE, 0xffff);
++
++ jz4740_timer_enable(TIMER_CLOCKEVENT);
++ jz4740_timer_enable(TIMER_CLOCKSOURCE);
++}