[PATCH v4] clocksource: dw_apb_timer: Add common DTS glue for dw_apb_timer
dinguyen at altera.com
dinguyen at altera.com
Wed Jul 11 12:41:03 EDT 2012
From: Dinh Nguyen <dinguyen at altera.com>
Make a common device tree glue for clocksource/dw_apb_timer.
Move mach-picoxcell/time.c to be a generic device tree application
of the dw_apb_timer.
Configure mach-picoxcell to use the dw_apb_timer_of device tree
implementation in drivers/clocksource.
Signed-off-by: Pavel Machek <pavel at denx.de>
Signed-off-by: Dinh Nguyen <dinguyen at altera.com>
Acked-by: Jamie Iles <jamie at jamieiles.com>
---
Documentation/devicetree/bindings/rtc/dw-apb.txt | 24 +++++++++
arch/arm/Kconfig | 1 +
arch/arm/mach-picoxcell/Makefile | 1 -
arch/arm/mach-picoxcell/common.c | 3 +-
arch/arm/mach-picoxcell/common.h | 2 +-
drivers/clocksource/Kconfig | 3 ++
drivers/clocksource/Makefile | 1 +
.../clocksource/dw_apb_timer_of.c | 51 ++++++++++++--------
8 files changed, 62 insertions(+), 24 deletions(-)
create mode 100644 Documentation/devicetree/bindings/rtc/dw-apb.txt
rename arch/arm/mach-picoxcell/time.c => drivers/clocksource/dw_apb_timer_of.c (58%)
diff --git a/Documentation/devicetree/bindings/rtc/dw-apb.txt b/Documentation/devicetree/bindings/rtc/dw-apb.txt
new file mode 100644
index 0000000..bbc459c
--- /dev/null
+++ b/Documentation/devicetree/bindings/rtc/dw-apb.txt
@@ -0,0 +1,24 @@
+* Designware APB timer
+
+Required properties:
+- compatible: "snps,dw-apb-timer-sp" or "snps,dw-apb-timer-osc"
+- reg: physical base address of the controller and length of memory mapped
+ region.
+- interrupts: IRQ line for the timer.
+- clock-frequency: The frequency in HZ of the timer.
+
+Example:
+
+ timer1: timer at ffc09000 {
+ compatible = "snps,dw-apb-timer-sp";
+ interrupts = <0 168 4>;
+ clock-frequency = <200000000>;
+ reg = <0xffc09000 0x1000>;
+ };
+
+ timer2: timer at ffd00000 {
+ compatible = "snps,dw-apb-timer-osc";
+ interrupts = <0 169 4>;
+ clock-frequency = <200000000>;
+ reg = <0xffd00000 0x1000>;
+ };
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index a91009c..57eb6ef 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -658,6 +658,7 @@ config ARCH_PICOXCELL
select ARM_VIC
select CPU_V6K
select DW_APB_TIMER
+ select DW_APB_TIMER_OF
select GENERIC_CLOCKEVENTS
select GENERIC_GPIO
select HAVE_TCM
diff --git a/arch/arm/mach-picoxcell/Makefile b/arch/arm/mach-picoxcell/Makefile
index e5ec4a8..8e39f80 100644
--- a/arch/arm/mach-picoxcell/Makefile
+++ b/arch/arm/mach-picoxcell/Makefile
@@ -1,2 +1 @@
obj-y := common.o
-obj-y += time.o
diff --git a/arch/arm/mach-picoxcell/common.c b/arch/arm/mach-picoxcell/common.c
index a2e8ae8..8f9a0b4 100644
--- a/arch/arm/mach-picoxcell/common.c
+++ b/arch/arm/mach-picoxcell/common.c
@@ -14,6 +14,7 @@
#include <linux/of_address.h>
#include <linux/of_irq.h>
#include <linux/of_platform.h>
+#include <linux/dw_apb_timer.h>
#include <asm/mach/arch.h>
#include <asm/hardware/vic.h>
@@ -97,7 +98,7 @@ DT_MACHINE_START(PICOXCELL, "Picochip picoXcell")
.nr_irqs = NR_IRQS_LEGACY,
.init_irq = picoxcell_init_irq,
.handle_irq = vic_handle_irq,
- .timer = &picoxcell_timer,
+ .timer = &dw_apb_timer,
.init_machine = picoxcell_init_machine,
.dt_compat = picoxcell_dt_match,
.restart = picoxcell_wdt_restart,
diff --git a/arch/arm/mach-picoxcell/common.h b/arch/arm/mach-picoxcell/common.h
index 83d55ab..a65cb02 100644
--- a/arch/arm/mach-picoxcell/common.h
+++ b/arch/arm/mach-picoxcell/common.h
@@ -12,6 +12,6 @@
#include <asm/mach/time.h>
-extern struct sys_timer picoxcell_timer;
+extern struct sys_timer dw_apb_timer;
#endif /* __PICOXCELL_COMMON_H__ */
diff --git a/drivers/clocksource/Kconfig b/drivers/clocksource/Kconfig
index 99c6b20..e62bc7e 100644
--- a/drivers/clocksource/Kconfig
+++ b/drivers/clocksource/Kconfig
@@ -16,6 +16,9 @@ config CLKSRC_MMIO
config DW_APB_TIMER
bool
+config DW_APB_TIMER_OF
+ bool
+
config CLKSRC_DBX500_PRCMU
bool "Clocksource PRCMU Timer"
depends on UX500_SOC_DB8500
diff --git a/drivers/clocksource/Makefile b/drivers/clocksource/Makefile
index dd3e661..2cdaf7d 100644
--- a/drivers/clocksource/Makefile
+++ b/drivers/clocksource/Makefile
@@ -10,4 +10,5 @@ obj-$(CONFIG_EM_TIMER_STI) += em_sti.o
obj-$(CONFIG_CLKBLD_I8253) += i8253.o
obj-$(CONFIG_CLKSRC_MMIO) += mmio.o
obj-$(CONFIG_DW_APB_TIMER) += dw_apb_timer.o
+obj-$(CONFIG_DW_APB_TIMER_OF) += dw_apb_timer_of.o
obj-$(CONFIG_CLKSRC_DBX500_PRCMU) += clksrc-dbx500-prcmu.o
\ No newline at end of file
diff --git a/arch/arm/mach-picoxcell/time.c b/drivers/clocksource/dw_apb_timer_of.c
similarity index 58%
rename from arch/arm/mach-picoxcell/time.c
rename to drivers/clocksource/dw_apb_timer_of.c
index 2ecba67..5c6812c 100644
--- a/arch/arm/mach-picoxcell/time.c
+++ b/drivers/clocksource/dw_apb_timer_of.c
@@ -1,11 +1,20 @@
/*
+ * Copyright (C) 2012 Altera Corporation
* Copyright (c) 2011 Picochip Ltd., Jamie Iles
*
+ * Modified from mach-picoxcell/time.c
+ *
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
- * All enquiries to support at picochip.com
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <linux/dw_apb_timer.h>
#include <linux/of.h>
@@ -15,8 +24,6 @@
#include <asm/mach/time.h>
#include <asm/sched_clock.h>
-#include "common.h"
-
static void timer_get_base_and_rate(struct device_node *np,
void __iomem **base, u32 *rate)
{
@@ -25,11 +32,11 @@ static void timer_get_base_and_rate(struct device_node *np,
if (!*base)
panic("Unable to map regs for %s", np->name);
- if (of_property_read_u32(np, "clock-freq", rate))
- panic("No clock-freq property for %s", np->name);
+ if (of_property_read_u32(np, "clock-frequency", rate))
+ panic("No clock-frequency property for %s", np->name);
}
-static void picoxcell_add_clockevent(struct device_node *event_timer)
+static void add_clockevent(struct device_node *event_timer)
{
void __iomem *iobase;
struct dw_apb_clock_event_device *ced;
@@ -49,7 +56,7 @@ static void picoxcell_add_clockevent(struct device_node *event_timer)
dw_apb_clockevent_register(ced);
}
-static void picoxcell_add_clocksource(struct device_node *source_timer)
+static void add_clocksource(struct device_node *source_timer)
{
void __iomem *iobase;
struct dw_apb_clocksource *cs;
@@ -67,55 +74,57 @@ static void picoxcell_add_clocksource(struct device_node *source_timer)
static void __iomem *sched_io_base;
-static u32 picoxcell_read_sched_clock(void)
+static u32 read_sched_clock(void)
{
return __raw_readl(sched_io_base);
}
-static const struct of_device_id picoxcell_rtc_ids[] __initconst = {
+static const struct of_device_id sptimer_ids[] __initconst = {
{ .compatible = "picochip,pc3x2-rtc" },
+ { .compatible = "snps,dw-apb-timer-sp" },
{ /* Sentinel */ },
};
-static void picoxcell_init_sched_clock(void)
+static void init_sched_clock(void)
{
struct device_node *sched_timer;
u32 rate;
- sched_timer = of_find_matching_node(NULL, picoxcell_rtc_ids);
+ sched_timer = of_find_matching_node(NULL, sptimer_ids);
if (!sched_timer)
panic("No RTC for sched clock to use");
timer_get_base_and_rate(sched_timer, &sched_io_base, &rate);
of_node_put(sched_timer);
- setup_sched_clock(picoxcell_read_sched_clock, 32, rate);
+ setup_sched_clock(read_sched_clock, 32, rate);
}
-static const struct of_device_id picoxcell_timer_ids[] __initconst = {
+static const struct of_device_id osctimer_ids[] __initconst = {
{ .compatible = "picochip,pc3x2-timer" },
+ { .compatible = "snps,dw-apb-timer-osc" },
{},
};
-static void __init picoxcell_timer_init(void)
+static void __init timer_init(void)
{
struct device_node *event_timer, *source_timer;
- event_timer = of_find_matching_node(NULL, picoxcell_timer_ids);
+ event_timer = of_find_matching_node(NULL, osctimer_ids);
if (!event_timer)
panic("No timer for clockevent");
- picoxcell_add_clockevent(event_timer);
+ add_clockevent(event_timer);
- source_timer = of_find_matching_node(event_timer, picoxcell_timer_ids);
+ source_timer = of_find_matching_node(event_timer, osctimer_ids);
if (!source_timer)
panic("No timer for clocksource");
- picoxcell_add_clocksource(source_timer);
+ add_clocksource(source_timer);
of_node_put(source_timer);
- picoxcell_init_sched_clock();
+ init_sched_clock();
}
-struct sys_timer picoxcell_timer = {
- .init = picoxcell_timer_init,
+struct sys_timer dw_apb_timer = {
+ .init = timer_init,
};
--
1.7.9.5
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