diff options
Diffstat (limited to 'target/linux/xburst/patches-2.6.35/006-clocksource.patch')
| -rw-r--r-- | target/linux/xburst/patches-2.6.35/006-clocksource.patch | 165 |
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); ++} |