clocksource: dw_apb_timer: Add common DTS glue for dw_apb_timer

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@denx.de>
Signed-off-by: Dinh Nguyen <dinguyen@altera.com>
Acked-by: Jamie Iles <jamie@jamieiles.com>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

8 files changed, 64 insertions, 24 deletions

diff --git a/Documentation/devicetree/bindings/rtc/dw-apb.txt b/Documentation/devicetree/bindings/rtc/dw-apb.txt
new file mode 100644
index 000000000000..93e2b0f048e6
--- /dev/null
+++ b/Documentation/devicetree/bindings/rtc/dw-apb.txt
@@ -0,0 +1,25 @@
+* 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.
+- clock-freq: For backwards compatibility with picoxcell
+
+Example:
+
+                timer1: timer@ffc09000 {
+                                compatible = "snps,dw-apb-timer-sp";
+                                interrupts = <0 168 4>;
+                                clock-frequency = <200000000>;
+                                reg = <0xffc09000 0x1000>;
+                        };
+
+                timer2: timer@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 a91009c61870..57eb6ef7f48d 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 e5ec4a8d9bcb..8e39f80fce19 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 a2e8ae8b5821..8f9a0b47a7fa 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 83d55ab956a4..a65cb02f84c8 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 99c6b203e6cd..e62bc7e9d49b 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 dd3e661a124d..2cdaf7d1019f 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
index 2ecba6743b8e..f7dba5b79b44 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@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 +32,12 @@ 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-freq", rate) &&
+                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 +57,7 @@ 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 +75,57 @@ 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,
 };