summaryrefslogtreecommitdiffstats
diff options
context:
space:
mode:
authorJean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>2012-02-27 11:19:34 +0100
committerNicolas Ferre <nicolas.ferre@atmel.com>2012-03-01 13:38:36 +0100
commit23fa648fd32658ca295de3ef2b7c883c7b8a6120 (patch)
tree987bbd0179c182faa455842cf66f63c054307ae5
parent8014d6f4dd074d4d248d3de7f63348fa2568476b (diff)
ARM: at91: pit add DT support
Retreive registers address and IRQ from device tree entry. Called from at91_dt_init_irq() so that timers are up-n-running when timers initialization will occur. Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com> [nicolas.ferre@atmel.com: change error path and interrupts property handling] Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
-rw-r--r--Documentation/devicetree/bindings/arm/atmel-at91.txt8
-rw-r--r--arch/arm/boot/dts/at91sam9g20.dtsi6
-rw-r--r--arch/arm/boot/dts/at91sam9g45.dtsi6
-rw-r--r--arch/arm/mach-at91/at91sam926x_time.c63
-rw-r--r--arch/arm/mach-at91/at91sam9x5.c2
5 files changed, 81 insertions, 4 deletions
diff --git a/Documentation/devicetree/bindings/arm/atmel-at91.txt b/Documentation/devicetree/bindings/arm/atmel-at91.txt
new file mode 100644
index 00000000000..380f711a202
--- /dev/null
+++ b/Documentation/devicetree/bindings/arm/atmel-at91.txt
@@ -0,0 +1,8 @@
+Atmel AT91 device tree bindings.
+================================
+
+PIT Timer required properties:
+- compatible: Should be "atmel,at91sam9260-pit"
+- reg: Should contain registers location and length
+- interrupts: Should contain interrupt for the PIT which is the IRQ line
+ shared across all System Controller members.
diff --git a/arch/arm/boot/dts/at91sam9g20.dtsi b/arch/arm/boot/dts/at91sam9g20.dtsi
index 325989a27a7..04c56c41001 100644
--- a/arch/arm/boot/dts/at91sam9g20.dtsi
+++ b/arch/arm/boot/dts/at91sam9g20.dtsi
@@ -57,6 +57,12 @@
reg = <0xfffff000 0x200>;
};
+ pit: timer@fffffd30 {
+ compatible = "atmel,at91sam9260-pit";
+ reg = <0xfffffd30 0xf>;
+ interrupts = <1 4>;
+ };
+
pioA: gpio@fffff400 {
compatible = "atmel,at91rm9200-gpio";
reg = <0xfffff400 0x100>;
diff --git a/arch/arm/boot/dts/at91sam9g45.dtsi b/arch/arm/boot/dts/at91sam9g45.dtsi
index a9dbbb5b86f..3881cab965f 100644
--- a/arch/arm/boot/dts/at91sam9g45.dtsi
+++ b/arch/arm/boot/dts/at91sam9g45.dtsi
@@ -58,6 +58,12 @@
reg = <0xfffff000 0x200>;
};
+ pit: timer@fffffd30 {
+ compatible = "atmel,at91sam9260-pit";
+ reg = <0xfffffd30 0xf>;
+ interrupts = <1 4>;
+ };
+
dma: dma-controller@ffffec00 {
compatible = "atmel,at91sam9g45-dma";
reg = <0xffffec00 0x200>;
diff --git a/arch/arm/mach-at91/at91sam926x_time.c b/arch/arm/mach-at91/at91sam926x_time.c
index d89ead740a9..5d71476a283 100644
--- a/arch/arm/mach-at91/at91sam926x_time.c
+++ b/arch/arm/mach-at91/at91sam926x_time.c
@@ -14,6 +14,9 @@
#include <linux/kernel.h>
#include <linux/clk.h>
#include <linux/clockchips.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
#include <asm/mach/time.h>
@@ -133,7 +136,8 @@ static irqreturn_t at91sam926x_pit_interrupt(int irq, void *dev_id)
static struct irqaction at91sam926x_pit_irq = {
.name = "at91_tick",
.flags = IRQF_SHARED | IRQF_DISABLED | IRQF_TIMER | IRQF_IRQPOLL,
- .handler = at91sam926x_pit_interrupt
+ .handler = at91sam926x_pit_interrupt,
+ .irq = AT91_ID_SYS,
};
static void at91sam926x_pit_reset(void)
@@ -149,6 +153,49 @@ static void at91sam926x_pit_reset(void)
pit_write(AT91_PIT_MR, (pit_cycle - 1) | AT91_PIT_PITEN);
}
+#ifdef CONFIG_OF
+static struct of_device_id pit_timer_ids[] = {
+ { .compatible = "atmel,at91sam9260-pit" },
+ { /* sentinel */ }
+};
+
+static int __init of_at91sam926x_pit_init(void)
+{
+ struct device_node *np;
+ int ret;
+
+ np = of_find_matching_node(NULL, pit_timer_ids);
+ if (!np)
+ goto err;
+
+ pit_base_addr = of_iomap(np, 0);
+ if (!pit_base_addr)
+ goto node_err;
+
+ /* Get the interrupts property */
+ ret = irq_of_parse_and_map(np, 0);
+ if (!ret)
+ goto ioremap_err;
+ at91sam926x_pit_irq.irq = ret;
+
+ of_node_put(np);
+
+ return 0;
+
+ioremap_err:
+ iounmap(pit_base_addr);
+node_err:
+ of_node_put(np);
+err:
+ return -EINVAL;
+}
+#else
+static int __init of_at91sam926x_pit_init(void)
+{
+ return -EINVAL;
+}
+#endif
+
/*
* Set up both clocksource and clockevent support.
*/
@@ -157,6 +204,9 @@ static void __init at91sam926x_pit_init(void)
unsigned long pit_rate;
unsigned bits;
+ /* For device tree enabled device: initialize here */
+ of_at91sam926x_pit_init();
+
/*
* Use our actual MCK to figure out how many MCK/16 ticks per
* 1/HZ period (instead of a compile-time constant LATCH).
@@ -177,7 +227,7 @@ static void __init at91sam926x_pit_init(void)
clocksource_register_hz(&pit_clk, pit_rate);
/* Set up irq handler */
- setup_irq(AT91_ID_SYS, &at91sam926x_pit_irq);
+ setup_irq(at91sam926x_pit_irq.irq, &at91sam926x_pit_irq);
/* Set up and register clockevents */
pit_clkevt.mult = div_sc(pit_rate, NSEC_PER_SEC, pit_clkevt.shift);
@@ -193,6 +243,15 @@ static void at91sam926x_pit_suspend(void)
void __init at91sam926x_ioremap_pit(u32 addr)
{
+#if defined(CONFIG_OF)
+ struct device_node *np =
+ of_find_matching_node(NULL, pit_timer_ids);
+
+ if (np) {
+ of_node_put(np);
+ return;
+ }
+#endif
pit_base_addr = ioremap(addr, 16);
if (!pit_base_addr)
diff --git a/arch/arm/mach-at91/at91sam9x5.c b/arch/arm/mach-at91/at91sam9x5.c
index d17d4262665..a34d96afa74 100644
--- a/arch/arm/mach-at91/at91sam9x5.c
+++ b/arch/arm/mach-at91/at91sam9x5.c
@@ -301,8 +301,6 @@ static void __init at91sam9x5_map_io(void)
static void __init at91sam9x5_ioremap_registers(void)
{
- if (of_at91sam926x_pit_init() < 0)
- panic("Impossible to find PIT\n");
at91_ioremap_ramc(0, AT91SAM9X5_BASE_DDRSDRC0, 512);
}