Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753662Ab0FSFJe (ORCPT ); Sat, 19 Jun 2010 01:09:34 -0400 Received: from smtp-out-037.synserver.de ([212.40.180.37]:1050 "HELO smtp-out-036.synserver.de" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with SMTP id S1753508Ab0FSFJc (ORCPT ); Sat, 19 Jun 2010 01:09:32 -0400 X-SynServer-TrustedSrc: 1 X-SynServer-AuthUser: lars@laprican.de X-SynServer-PPID: 13414 From: Lars-Peter Clausen To: Ralf Baechle Cc: linux-mips@linux-mips.org, linux-kernel@vger.kernel.org, Lars-Peter Clausen Subject: [PATCH v2 05/26] MIPS: JZ4740: Add clocksource/clockevent support. Date: Sat, 19 Jun 2010 07:08:10 +0200 Message-Id: <1276924111-11158-6-git-send-email-lars@metafoo.de> X-Mailer: git-send-email 1.5.6.5 In-Reply-To: <1276924111-11158-1-git-send-email-lars@metafoo.de> References: <1276924111-11158-1-git-send-email-lars@metafoo.de> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 5269 Lines: 184 This patch add clocksource and clockevent support for the timer/counter unit on JZ4740 SoCs. Signed-off-by: Lars-Peter Clausen --- Changes since v1 - Do not setup timer IRQ with IRQF_DISABLED, since it is a noop now. --- arch/mips/jz4740/irq.c | 1 - arch/mips/jz4740/time.c | 144 +++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 144 insertions(+), 1 deletions(-) create mode 100644 arch/mips/jz4740/time.c diff --git a/arch/mips/jz4740/irq.c b/arch/mips/jz4740/irq.c index ea19f0e..e259d02 100644 --- a/arch/mips/jz4740/irq.c +++ b/arch/mips/jz4740/irq.c @@ -88,7 +88,6 @@ static irqreturn_t jz4740_cascade(int irq, void *data) static struct irqaction jz4740_cascade_action = { .handler = jz4740_cascade, .name = "JZ4740 cascade interrupt", - .flags = IRQF_DISABLED, }; void __init arch_init_irq(void) diff --git a/arch/mips/jz4740/time.c b/arch/mips/jz4740/time.c new file mode 100644 index 0000000..fe01678 --- /dev/null +++ b/arch/mips/jz4740/time.c @@ -0,0 +1,144 @@ +/* + * Copyright (C) 2010, Lars-Peter Clausen + * 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 +#include +#include + +#include + +#include +#include + +#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); +} -- 1.5.6.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/