From: cavokz@gmail.com (Domenico Andreoli)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH 3/6] ARM: bcm476x: Add sched clock
Date: Sun, 07 Oct 2012 03:53:03 +0200 [thread overview]
Message-ID: <20121007015406.809888002@gmail.com> (raw)
In-Reply-To: 20121007015300.828366635@gmail.com
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Name: arm-bcm476x-add-sched-clock.patch
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WARNING: multiple messages have this Message-ID (diff)
From: Domenico Andreoli <cavokz-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
To: linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org
Cc: Domenico Andreoli
<domenico.andreoli-vYTEC60ixJUAvxtiuMwx3w@public.gmane.org>,
devicetree-discuss-uLR06cmDAlY/bJ5BZ2RsiQ@public.gmane.org
Subject: [PATCH 3/6] ARM: bcm476x: Add sched clock
Date: Sun, 07 Oct 2012 03:53:03 +0200 [thread overview]
Message-ID: <20121007015406.809888002@gmail.com> (raw)
In-Reply-To: 20121007015300.828366635@gmail.com
[-- Attachment #1: arm-bcm476x-add-sched-clock.patch --]
[-- Type: text/plain, Size: 3704 bytes --]
From: Domenico Andreoli <domenico.andreoli-vYTEC60ixJUAvxtiuMwx3w@public.gmane.org>
Sched clock implementation based on the BCM476x's free runner counter.
Signed-off-by: Domenico Andreoli <domenico.andreoli-vYTEC60ixJUAvxtiuMwx3w@public.gmane.org>
---
Documentation/devicetree/bindings/timer/brcm,bcm476x-sched-clock.txt | 18 +++
arch/arm/boot/dts/bcm476x.dtsi | 6 +
drivers/clocksource/bcm476x_timer.c | 52 ++++++++++
3 files changed, 76 insertions(+)
Index: b/Documentation/devicetree/bindings/timer/brcm,bcm476x-sched-clock.txt
===================================================================
--- /dev/null
+++ b/Documentation/devicetree/bindings/timer/brcm,bcm476x-sched-clock.txt
@@ -0,0 +1,18 @@
+BCM476x Sched clock
+
+The BCM476x provides a 63-bit free running counter driven by a separate
+32KHz clock line.
+
+Required properties:
+
+- compatible : should be "brcm,bcm476x-sched-clock"
+- reg : Specifies base physical address and size of the registers.
+- clock-frequency : The frequency of the clock that drives the counter, in Hz.
+
+Example:
+
+sched-clock {
+ compatible = "brcm,bcm476x-sched-clock";
+ reg = <0xbc000 0x1000>;
+ clock-frequency = <32000>;
+};
Index: b/drivers/clocksource/bcm476x_timer.c
===================================================================
--- a/drivers/clocksource/bcm476x_timer.c
+++ b/drivers/clocksource/bcm476x_timer.c
@@ -54,6 +54,21 @@ struct bcm476x_timer {
struct irqaction act;
};
+static void __iomem *system_clock __read_mostly;
+
+static u32 notrace bcm476x_sched_read(void)
+{
+ u32 hi, lo;
+
+ /* access to the counter must happen in the lo-hi order even if
+ * only the lower 32-bit part is of interest
+ */
+ lo = readl(system_clock);
+ hi = readl(system_clock + 4);
+
+ return lo;
+}
+
static inline void __iomem *to_load(struct bcm476x_timer *timer)
{
return timer->base + TIMER_LOAD_OFFSET;
@@ -131,6 +146,42 @@ static irqreturn_t bcm476x_timer_interru
return IRQ_HANDLED;
}
+static struct of_device_id bcm476x_sched_clock_match[] __initconst = {
+ { .compatible = "brcm,bcm476x-sched-clock" },
+ {}
+};
+
+static void __init bcm476x_sched_clock_init(void)
+{
+ struct device_node *node;
+ void __iomem *base;
+ u32 freq;
+
+ node = of_find_matching_node(NULL, bcm476x_sched_clock_match);
+ if (!node) {
+ pr_info("No bcm476x sched clock node");
+ return;
+ }
+
+ base = of_iomap(node, 0);
+ if (!base) {
+ pr_err("Can't remap sched clock registers");
+ return;
+ }
+
+ if (of_property_read_u32(node, "clock-frequency", &freq)) {
+ pr_err("Can't read sched clock frequency");
+ return;
+ }
+ if (freq != 32000) {
+ pr_err("Invalid sched clock frequency");
+ return;
+ }
+
+ system_clock = base;
+ setup_sched_clock(bcm476x_sched_read, 32, freq);
+}
+
static struct of_device_id bcm476x_timer_match[] __initconst = {
{ .compatible = "brcm,bcm476x-system-timer" },
{}
@@ -180,6 +231,7 @@ static void __init bcm476x_timer_init(vo
if (setup_irq(irq, &timer->act))
panic("Can't set up timer IRQ\n");
+ bcm476x_sched_clock_init();
clockevents_config_and_register(&timer->evt, freq, 0xf, 0xffffffff);
}
Index: b/arch/arm/boot/dts/bcm476x.dtsi
===================================================================
--- a/arch/arm/boot/dts/bcm476x.dtsi
+++ b/arch/arm/boot/dts/bcm476x.dtsi
@@ -22,6 +22,12 @@
clock-frequency = <24000000>;
};
+ sched-clock {
+ compatible = "brcm,bcm476x-sched-clock";
+ reg = <0xbc000 0x1000>;
+ clock-frequency = <32000>;
+ };
+
vic0: interrupt-controller@80000 {
compatible = "brcm,bcm476x-pl192", "arm,pl192-vic", "arm,primecell";
reg = <0x80000 0x1000>;
next prev parent reply other threads:[~2012-10-07 1:53 UTC|newest]
Thread overview: 92+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-10-07 1:53 [PATCH 0/6] ARM: Add support for Broadcom BCM476x SoCs Domenico Andreoli
2012-10-07 1:53 ` Domenico Andreoli
2012-10-07 1:53 ` [PATCH 1/6] ARM: bcm476x: Add infrastructure Domenico Andreoli
2012-10-07 1:53 ` Domenico Andreoli
2012-10-07 19:57 ` Jean-Christophe PLAGNIOL-VILLARD
2012-10-07 19:57 ` Jean-Christophe PLAGNIOL-VILLARD
2012-10-07 22:54 ` Domenico Andreoli
2012-10-07 22:54 ` Domenico Andreoli
2012-10-08 13:13 ` Jean-Christophe PLAGNIOL-VILLARD
2012-10-08 13:13 ` Jean-Christophe PLAGNIOL-VILLARD
2012-10-09 2:37 ` Stephen Warren
2012-10-09 2:37 ` Stephen Warren
2012-10-09 11:50 ` Domenico Andreoli
2012-10-09 11:50 ` Domenico Andreoli
2012-10-08 11:50 ` Florian Fainelli
2012-10-08 11:50 ` Florian Fainelli
2012-10-09 2:41 ` Stephen Warren
2012-10-09 2:41 ` Stephen Warren
2012-10-08 12:14 ` Thomas Petazzoni
2012-10-08 12:14 ` Thomas Petazzoni
2012-10-09 11:52 ` Domenico Andreoli
2012-10-09 11:52 ` Domenico Andreoli
2012-10-09 2:48 ` Stephen Warren
2012-10-09 2:48 ` Stephen Warren
2012-10-09 11:54 ` Domenico Andreoli
2012-10-09 11:54 ` Domenico Andreoli
2012-10-09 3:08 ` Stephen Warren
2012-10-09 3:08 ` Stephen Warren
2012-10-09 11:55 ` Domenico Andreoli
2012-10-09 11:55 ` Domenico Andreoli
2012-10-09 9:18 ` Arnd Bergmann
2012-10-09 9:18 ` Arnd Bergmann
2012-10-09 22:58 ` Domenico Andreoli
2012-10-09 22:58 ` Domenico Andreoli
2012-10-10 6:29 ` Arnd Bergmann
2012-10-10 6:29 ` Arnd Bergmann
2012-10-12 7:06 ` Domenico Andreoli
2012-10-12 7:06 ` Domenico Andreoli
2012-10-12 7:26 ` Thomas Petazzoni
2012-10-12 7:26 ` Thomas Petazzoni
2012-10-12 8:03 ` Arnd Bergmann
2012-10-12 8:03 ` Arnd Bergmann
2012-10-12 8:12 ` Thomas Petazzoni
2012-10-12 8:12 ` Thomas Petazzoni
2012-10-12 10:48 ` Arnd Bergmann
2012-10-12 10:48 ` Arnd Bergmann
2012-10-12 11:01 ` Thomas Petazzoni
2012-10-12 11:01 ` Thomas Petazzoni
2012-10-12 11:17 ` Arnd Bergmann
2012-10-12 11:17 ` Arnd Bergmann
2012-10-07 1:53 ` [PATCH 2/6] ARM: bcm476x: Add system timer Domenico Andreoli
2012-10-07 1:53 ` Domenico Andreoli
2012-10-08 11:50 ` Florian Fainelli
2012-10-08 11:50 ` Florian Fainelli
2012-10-09 2:43 ` Stephen Warren
2012-10-09 2:43 ` Stephen Warren
2012-10-09 23:04 ` Domenico Andreoli
2012-10-09 23:04 ` Domenico Andreoli
2012-10-07 1:53 ` Domenico Andreoli [this message]
2012-10-07 1:53 ` [PATCH 3/6] ARM: bcm476x: Add sched clock Domenico Andreoli
2012-10-09 2:54 ` Stephen Warren
2012-10-09 2:54 ` Stephen Warren
2012-10-07 1:53 ` [PATCH 4/6] ARM: bcm476x: Add stub clock driver Domenico Andreoli
2012-10-07 1:53 ` Domenico Andreoli
2012-10-09 3:00 ` Stephen Warren
2012-10-09 3:00 ` Stephen Warren
2012-10-12 14:52 ` Mike Turquette
2012-10-12 14:52 ` Mike Turquette
2012-10-12 15:28 ` Domenico Andreoli
2012-10-12 15:28 ` Domenico Andreoli
2012-10-07 1:53 ` [PATCH 5/6] ARM: bcm476x: Add restart hook Domenico Andreoli
2012-10-07 1:53 ` Domenico Andreoli
2012-10-07 1:53 ` [PATCH 6/6] ARM: bcm476x: Instantiate console UART Domenico Andreoli
2012-10-07 1:53 ` Domenico Andreoli
2012-10-07 20:03 ` Jean-Christophe PLAGNIOL-VILLARD
2012-10-07 20:03 ` Jean-Christophe PLAGNIOL-VILLARD
2012-10-07 23:14 ` Domenico Andreoli
2012-10-07 23:14 ` Domenico Andreoli
2012-10-09 3:06 ` Stephen Warren
2012-10-09 3:06 ` Stephen Warren
2012-10-09 23:37 ` Domenico Andreoli
2012-10-09 23:37 ` Domenico Andreoli
2012-10-07 5:22 ` [PATCH 0/6] ARM: Add support for Broadcom BCM476x SoCs Stephen Warren
2012-10-07 5:22 ` Stephen Warren
2012-10-07 10:14 ` Domenico Andreoli
2012-10-07 10:14 ` Domenico Andreoli
2012-10-09 2:44 ` Stephen Warren
2012-10-09 2:44 ` Stephen Warren
2012-10-09 23:57 ` Domenico Andreoli
2012-10-09 23:57 ` Domenico Andreoli
2012-10-07 19:47 ` Olof Johansson
2012-10-07 19:47 ` Olof Johansson
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