146 lines
4.5 KiB
Diff
146 lines
4.5 KiB
Diff
From: Benedikt Spranger <b.spranger@linutronix.de>
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Date: Sat, 6 Mar 2010 17:47:10 +0100
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Subject: ARM: AT91: PIT: Remove irq handler when clock event is unused
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Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.11/older/patches-4.11.5-rt1.tar.xz
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Setup and remove the interrupt handler in clock event mode selection.
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This avoids calling the (shared) interrupt handler when the device is
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not used.
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Signed-off-by: Benedikt Spranger <b.spranger@linutronix.de>
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Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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[bigeasy: redo the patch with NR_IRQS_LEGACY which is probably required since
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commit 8fe82a55 ("ARM: at91: sparse irq support") which is included since v3.6.
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Patch based on what Sami Pietikäinen <Sami.Pietikainen@wapice.com> suggested].
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Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
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---
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drivers/clocksource/timer-atmel-pit.c | 18 +++++++++---------
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drivers/clocksource/timer-atmel-st.c | 34 ++++++++++++++++++++++------------
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2 files changed, 31 insertions(+), 21 deletions(-)
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--- a/drivers/clocksource/timer-atmel-pit.c
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+++ b/drivers/clocksource/timer-atmel-pit.c
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@@ -96,15 +96,24 @@ static int pit_clkevt_shutdown(struct cl
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/* disable irq, leaving the clocksource active */
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pit_write(data->base, AT91_PIT_MR, (data->cycle - 1) | AT91_PIT_PITEN);
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+ free_irq(data->irq, data);
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return 0;
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}
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+static irqreturn_t at91sam926x_pit_interrupt(int irq, void *dev_id);
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/*
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* Clockevent device: interrupts every 1/HZ (== pit_cycles * MCK/16)
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*/
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static int pit_clkevt_set_periodic(struct clock_event_device *dev)
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{
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struct pit_data *data = clkevt_to_pit_data(dev);
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+ int ret;
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+
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+ ret = request_irq(data->irq, at91sam926x_pit_interrupt,
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+ IRQF_SHARED | IRQF_TIMER | IRQF_IRQPOLL,
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+ "at91_tick", data);
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+ if (ret)
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+ panic(pr_fmt("Unable to setup IRQ\n"));
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/* update clocksource counter */
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data->cnt += data->cycle * PIT_PICNT(pit_read(data->base, AT91_PIT_PIVR));
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@@ -230,15 +239,6 @@ static int __init at91sam926x_pit_dt_ini
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return ret;
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}
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- /* Set up irq handler */
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- ret = request_irq(data->irq, at91sam926x_pit_interrupt,
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- IRQF_SHARED | IRQF_TIMER | IRQF_IRQPOLL,
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- "at91_tick", data);
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- if (ret) {
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- pr_err("Unable to setup IRQ\n");
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- return ret;
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- }
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-
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/* Set up and register clockevents */
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data->clkevt.name = "pit";
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data->clkevt.features = CLOCK_EVT_FEAT_PERIODIC;
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--- a/drivers/clocksource/timer-atmel-st.c
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+++ b/drivers/clocksource/timer-atmel-st.c
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@@ -115,18 +115,29 @@ static void clkdev32k_disable_and_flush_
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last_crtr = read_CRTR();
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}
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+static int atmel_st_irq;
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+
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static int clkevt32k_shutdown(struct clock_event_device *evt)
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{
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clkdev32k_disable_and_flush_irq();
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irqmask = 0;
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regmap_write(regmap_st, AT91_ST_IER, irqmask);
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+ free_irq(atmel_st_irq, regmap_st);
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return 0;
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}
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static int clkevt32k_set_oneshot(struct clock_event_device *dev)
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{
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+ int ret;
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+
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clkdev32k_disable_and_flush_irq();
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+ ret = request_irq(atmel_st_irq, at91rm9200_timer_interrupt,
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+ IRQF_SHARED | IRQF_TIMER | IRQF_IRQPOLL,
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+ "at91_tick", regmap_st);
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+ if (ret)
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+ panic(pr_fmt("Unable to setup IRQ\n"));
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+
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/*
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* ALM for oneshot irqs, set by next_event()
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* before 32 seconds have passed.
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@@ -139,8 +150,16 @@ static int clkevt32k_set_oneshot(struct
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static int clkevt32k_set_periodic(struct clock_event_device *dev)
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{
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+ int ret;
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+
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clkdev32k_disable_and_flush_irq();
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+ ret = request_irq(atmel_st_irq, at91rm9200_timer_interrupt,
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+ IRQF_SHARED | IRQF_TIMER | IRQF_IRQPOLL,
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+ "at91_tick", regmap_st);
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+ if (ret)
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+ panic(pr_fmt("Unable to setup IRQ\n"));
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+
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/* PIT for periodic irqs; fixed rate of 1/HZ */
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irqmask = AT91_ST_PITS;
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regmap_write(regmap_st, AT91_ST_PIMR, timer_latch);
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@@ -198,7 +217,7 @@ static int __init atmel_st_timer_init(st
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{
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struct clk *sclk;
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unsigned int sclk_rate, val;
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- int irq, ret;
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+ int ret;
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regmap_st = syscon_node_to_regmap(node);
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if (IS_ERR(regmap_st)) {
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@@ -212,21 +231,12 @@ static int __init atmel_st_timer_init(st
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regmap_read(regmap_st, AT91_ST_SR, &val);
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/* Get the interrupts property */
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- irq = irq_of_parse_and_map(node, 0);
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- if (!irq) {
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+ atmel_st_irq = irq_of_parse_and_map(node, 0);
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+ if (!atmel_st_irq) {
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pr_err("Unable to get IRQ from DT\n");
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return -EINVAL;
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}
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- /* Make IRQs happen for the system timer */
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- ret = request_irq(irq, at91rm9200_timer_interrupt,
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- IRQF_SHARED | IRQF_TIMER | IRQF_IRQPOLL,
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- "at91_tick", regmap_st);
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- if (ret) {
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- pr_err("Unable to setup IRQ\n");
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- return ret;
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- }
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-
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sclk = of_clk_get(node, 0);
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if (IS_ERR(sclk)) {
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pr_err("Unable to get slow clock\n");
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