ARM: AT91: Add DT support to AT91RM9200 System Timer
Based on AT91 PIT DT patch from Jean-Christophe PLAGNIOL-VILLARD. Signed-off-by: Joachim Eastwood <manabian@gmail.com> Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
This commit is contained in:
committed by
Jean-Christophe PLAGNIOL-VILLARD
parent
35ed3c7a3d
commit
454c46df83
@ -7,6 +7,12 @@ PIT Timer required properties:
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- interrupts: Should contain interrupt for the PIT which is the IRQ line
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- interrupts: Should contain interrupt for the PIT which is the IRQ line
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shared across all System Controller members.
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shared across all System Controller members.
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System Timer (ST) required properties:
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- compatible: Should be "atmel,at91rm9200-st"
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- reg: Should contain registers location and length
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- interrupts: Should contain interrupt for the ST which is the IRQ line
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shared across all System Controller members.
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TC/TCLIB Timer required properties:
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TC/TCLIB Timer required properties:
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- compatible: Should be "atmel,<chip>-pit".
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- compatible: Should be "atmel,<chip>-pit".
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<chip> can be "at91rm9200" or "at91sam9x5"
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<chip> can be "at91rm9200" or "at91sam9x5"
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@ -24,6 +24,9 @@
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#include <linux/irq.h>
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#include <linux/irq.h>
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#include <linux/clockchips.h>
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#include <linux/clockchips.h>
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#include <linux/export.h>
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#include <linux/export.h>
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#include <linux/of.h>
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#include <linux/of_address.h>
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#include <linux/of_irq.h>
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#include <asm/mach/time.h>
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#include <asm/mach/time.h>
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@ -91,7 +94,8 @@ static irqreturn_t at91rm9200_timer_interrupt(int irq, void *dev_id)
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static struct irqaction at91rm9200_timer_irq = {
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static struct irqaction at91rm9200_timer_irq = {
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.name = "at91_tick",
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.name = "at91_tick",
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.flags = IRQF_SHARED | IRQF_DISABLED | IRQF_TIMER | IRQF_IRQPOLL,
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.flags = IRQF_SHARED | IRQF_DISABLED | IRQF_TIMER | IRQF_IRQPOLL,
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.handler = at91rm9200_timer_interrupt
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.handler = at91rm9200_timer_interrupt,
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.irq = NR_IRQS_LEGACY + AT91_ID_SYS,
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};
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};
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static cycle_t read_clk32k(struct clocksource *cs)
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static cycle_t read_clk32k(struct clocksource *cs)
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@ -179,8 +183,60 @@ static struct clock_event_device clkevt = {
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void __iomem *at91_st_base;
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void __iomem *at91_st_base;
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EXPORT_SYMBOL_GPL(at91_st_base);
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EXPORT_SYMBOL_GPL(at91_st_base);
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#ifdef CONFIG_OF
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static struct of_device_id at91rm9200_st_timer_ids[] = {
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{ .compatible = "atmel,at91rm9200-st" },
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{ /* sentinel */ }
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};
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static int __init of_at91rm9200_st_init(void)
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{
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struct device_node *np;
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int ret;
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np = of_find_matching_node(NULL, at91rm9200_st_timer_ids);
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if (!np)
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goto err;
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at91_st_base = of_iomap(np, 0);
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if (!at91_st_base)
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goto node_err;
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/* Get the interrupts property */
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ret = irq_of_parse_and_map(np, 0);
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if (!ret)
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goto ioremap_err;
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at91rm9200_timer_irq.irq = ret;
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of_node_put(np);
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return 0;
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ioremap_err:
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iounmap(at91_st_base);
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node_err:
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of_node_put(np);
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err:
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return -EINVAL;
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}
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#else
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static int __init of_at91rm9200_st_init(void)
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{
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return -EINVAL;
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}
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#endif
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void __init at91rm9200_ioremap_st(u32 addr)
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void __init at91rm9200_ioremap_st(u32 addr)
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{
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{
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#ifdef CONFIG_OF
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struct device_node *np;
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np = of_find_matching_node(NULL, at91rm9200_st_timer_ids);
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if (np) {
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of_node_put(np);
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return;
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}
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#endif
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at91_st_base = ioremap(addr, 256);
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at91_st_base = ioremap(addr, 256);
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if (!at91_st_base)
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if (!at91_st_base)
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panic("Impossible to ioremap ST\n");
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panic("Impossible to ioremap ST\n");
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@ -191,13 +247,16 @@ void __init at91rm9200_ioremap_st(u32 addr)
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*/
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*/
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void __init at91rm9200_timer_init(void)
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void __init at91rm9200_timer_init(void)
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{
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{
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/* For device tree enabled device: initialize here */
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of_at91rm9200_st_init();
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/* Disable all timer interrupts, and clear any pending ones */
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/* Disable all timer interrupts, and clear any pending ones */
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at91_st_write(AT91_ST_IDR,
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at91_st_write(AT91_ST_IDR,
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AT91_ST_PITS | AT91_ST_WDOVF | AT91_ST_RTTINC | AT91_ST_ALMS);
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AT91_ST_PITS | AT91_ST_WDOVF | AT91_ST_RTTINC | AT91_ST_ALMS);
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at91_st_read(AT91_ST_SR);
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at91_st_read(AT91_ST_SR);
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/* Make IRQs happen for the system timer */
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/* Make IRQs happen for the system timer */
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setup_irq(NR_IRQS_LEGACY + AT91_ID_SYS, &at91rm9200_timer_irq);
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setup_irq(at91rm9200_timer_irq.irq, &at91rm9200_timer_irq);
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/* The 32KiHz "Slow Clock" (tick every 30517.58 nanoseconds) is used
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/* The 32KiHz "Slow Clock" (tick every 30517.58 nanoseconds) is used
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* directly for the clocksource and all clockevents, after adjusting
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* directly for the clocksource and all clockevents, after adjusting
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