4 files changed, 91 insertions, 38 deletions

diff --git a/Documentation/devicetree/bindings/timer/stericsson-u300-apptimer.txt b/Documentation/devicetree/bindings/timer/stericsson-u300-apptimer.txt
new file mode 100644
index 000000000000..9499bc8ee9e3
--- /dev/null
+++ b/Documentation/devicetree/bindings/timer/stericsson-u300-apptimer.txt
@@ -0,0 +1,18 @@
+ST-Ericsson U300 apptimer
+
+Required properties:
+
+- compatible : should be "stericsson,u300-apptimer"
+- reg : Specifies base physical address and size of the registers.
+- interrupts : A list of 4 interrupts; one for each subtimer. These
+  are, in order: OS (operating system), DD (device driver) both
+  adopted for EPOC/Symbian with two specific IRQs for these tasks,
+  then GP1 and GP2, which are general-purpose timers.
+
+Example:
+
+timer {
+        compatible = "stericsson,u300-apptimer";
+        reg = <0xc0014000 0x1000>;
+        interrupts = <24 25 26 27>;
+};
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index d423d58f938d..fbad3337a838 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -821,6 +821,7 @@ config ARCH_U300
         select ARM_VIC
         select CLKDEV_LOOKUP
         select CLKSRC_MMIO
+        select CLKSRC_OF
         select COMMON_CLK
         select CPU_ARM926T
         select GENERIC_CLOCKEVENTS
diff --git a/arch/arm/mach-u300/timer.c b/arch/arm/mach-u300/timer.c
index c3d3802b46a0..df1e3b5427b6 100644
--- a/arch/arm/mach-u300/timer.c
+++ b/arch/arm/mach-u300/timer.c
@@ -19,6 +19,8 @@
 #include <linux/err.h>
 #include <linux/irq.h>
 #include <linux/delay.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
 
 #include <mach/hardware.h>
 #include <mach/irqs.h>
@@ -190,6 +192,8 @@
 #define TICKS_PER_JIFFY ((CLOCK_TICK_RATE + (HZ/2)) / HZ)
 #define US_PER_TICK ((1000000 + (HZ/2)) / HZ)
 
+static void __iomem *u300_timer_base;
+
 /*
  * The u300_set_mode() function is always called first, if we
  * have oneshot timer active, the oneshot scheduling function
@@ -202,28 +206,28 @@ static void u300_set_mode(enum clock_event_mode mode,
         case CLOCK_EVT_MODE_PERIODIC:
                 /* Disable interrupts on GPT1 */
                 writel(U300_TIMER_APP_GPT1IE_IRQ_DISABLE,
-                       U300_TIMER_APP_VBASE + U300_TIMER_APP_GPT1IE);
+                       u300_timer_base + U300_TIMER_APP_GPT1IE);
                 /* Disable GP1 while we're reprogramming it. */
                 writel(U300_TIMER_APP_DGPT1_TIMER_DISABLE,
-                       U300_TIMER_APP_VBASE + U300_TIMER_APP_DGPT1);
+                       u300_timer_base + U300_TIMER_APP_DGPT1);
                 /*
                  * Set the periodic mode to a certain number of ticks per
                  * jiffy.
                  */
                 writel(TICKS_PER_JIFFY,
-                       U300_TIMER_APP_VBASE + U300_TIMER_APP_GPT1TC);
+                       u300_timer_base + U300_TIMER_APP_GPT1TC);
                 /*
                  * Set continuous mode, so the timer keeps triggering
                  * interrupts.
                  */
                 writel(U300_TIMER_APP_SGPT1M_MODE_CONTINUOUS,
-                       U300_TIMER_APP_VBASE + U300_TIMER_APP_SGPT1M);
+                       u300_timer_base + U300_TIMER_APP_SGPT1M);
                 /* Enable timer interrupts */
                 writel(U300_TIMER_APP_GPT1IE_IRQ_ENABLE,
-                       U300_TIMER_APP_VBASE + U300_TIMER_APP_GPT1IE);
+                       u300_timer_base + U300_TIMER_APP_GPT1IE);
                 /* Then enable the OS timer again */
                 writel(U300_TIMER_APP_EGPT1_TIMER_ENABLE,
-                       U300_TIMER_APP_VBASE + U300_TIMER_APP_EGPT1);
+                       u300_timer_base + U300_TIMER_APP_EGPT1);
                 break;
         case CLOCK_EVT_MODE_ONESHOT:
                 /* Just break; here? */
@@ -234,33 +238,33 @@ static void u300_set_mode(enum clock_event_mode mode,
                  */
                 /* Disable interrupts on GPT1 */
                 writel(U300_TIMER_APP_GPT1IE_IRQ_DISABLE,
-                       U300_TIMER_APP_VBASE + U300_TIMER_APP_GPT1IE);
+                       u300_timer_base + U300_TIMER_APP_GPT1IE);
                 /* Disable GP1 while we're reprogramming it. */
                 writel(U300_TIMER_APP_DGPT1_TIMER_DISABLE,
-                       U300_TIMER_APP_VBASE + U300_TIMER_APP_DGPT1);
+                       u300_timer_base + U300_TIMER_APP_DGPT1);
                 /*
                  * Expire far in the future, u300_set_next_event() will be
                  * called soon...
                  */
-                writel(0xFFFFFFFF, U300_TIMER_APP_VBASE + U300_TIMER_APP_GPT1TC);
+                writel(0xFFFFFFFF, u300_timer_base + U300_TIMER_APP_GPT1TC);
                 /* We run one shot per tick here! */
                 writel(U300_TIMER_APP_SGPT1M_MODE_ONE_SHOT,
-                       U300_TIMER_APP_VBASE + U300_TIMER_APP_SGPT1M);
+                       u300_timer_base + U300_TIMER_APP_SGPT1M);
                 /* Enable interrupts for this timer */
                 writel(U300_TIMER_APP_GPT1IE_IRQ_ENABLE,
-                       U300_TIMER_APP_VBASE + U300_TIMER_APP_GPT1IE);
+                       u300_timer_base + U300_TIMER_APP_GPT1IE);
                 /* Enable timer */
                 writel(U300_TIMER_APP_EGPT1_TIMER_ENABLE,
-                       U300_TIMER_APP_VBASE + U300_TIMER_APP_EGPT1);
+                       u300_timer_base + U300_TIMER_APP_EGPT1);
                 break;
         case CLOCK_EVT_MODE_UNUSED:
         case CLOCK_EVT_MODE_SHUTDOWN:
                 /* Disable interrupts on GP1 */
                 writel(U300_TIMER_APP_GPT1IE_IRQ_DISABLE,
-                       U300_TIMER_APP_VBASE + U300_TIMER_APP_GPT1IE);
+                       u300_timer_base + U300_TIMER_APP_GPT1IE);
                 /* Disable GP1 */
                 writel(U300_TIMER_APP_DGPT1_TIMER_DISABLE,
-                       U300_TIMER_APP_VBASE + U300_TIMER_APP_DGPT1);
+                       u300_timer_base + U300_TIMER_APP_DGPT1);
                 break;
         case CLOCK_EVT_MODE_RESUME:
                 /* Ignore this call */
@@ -282,27 +286,27 @@ static int u300_set_next_event(unsigned long cycles,
 {
         /* Disable interrupts on GPT1 */
         writel(U300_TIMER_APP_GPT1IE_IRQ_DISABLE,
-               U300_TIMER_APP_VBASE + U300_TIMER_APP_GPT1IE);
+               u300_timer_base + U300_TIMER_APP_GPT1IE);
         /* Disable GP1 while we're reprogramming it. */
         writel(U300_TIMER_APP_DGPT1_TIMER_DISABLE,
-               U300_TIMER_APP_VBASE + U300_TIMER_APP_DGPT1);
+               u300_timer_base + U300_TIMER_APP_DGPT1);
         /* Reset the General Purpose timer 1. */
         writel(U300_TIMER_APP_RGPT1_TIMER_RESET,
-               U300_TIMER_APP_VBASE + U300_TIMER_APP_RGPT1);
+               u300_timer_base + U300_TIMER_APP_RGPT1);
         /* IRQ in n * cycles */
-        writel(cycles, U300_TIMER_APP_VBASE + U300_TIMER_APP_GPT1TC);
+        writel(cycles, u300_timer_base + U300_TIMER_APP_GPT1TC);
         /*
          * We run one shot per tick here! (This is necessary to reconfigure,
          * the timer will tilt if you don't!)
          */
         writel(U300_TIMER_APP_SGPT1M_MODE_ONE_SHOT,
-               U300_TIMER_APP_VBASE + U300_TIMER_APP_SGPT1M);
+               u300_timer_base + U300_TIMER_APP_SGPT1M);
         /* Enable timer interrupts */
         writel(U300_TIMER_APP_GPT1IE_IRQ_ENABLE,
-               U300_TIMER_APP_VBASE + U300_TIMER_APP_GPT1IE);
+               u300_timer_base + U300_TIMER_APP_GPT1IE);
         /* Then enable the OS timer again */
         writel(U300_TIMER_APP_EGPT1_TIMER_ENABLE,
-               U300_TIMER_APP_VBASE + U300_TIMER_APP_EGPT1);
+               u300_timer_base + U300_TIMER_APP_EGPT1);
         return 0;
 }
 
@@ -321,8 +325,9 @@ static irqreturn_t u300_timer_interrupt(int irq, void *dev_id)
 {
         struct clock_event_device *evt = &clockevent_u300_1mhz;
         /* ACK/Clear timer IRQ for the APP GPT1 Timer */
+
         writel(U300_TIMER_APP_GPT1IA_IRQ_ACK,
-                U300_TIMER_APP_VBASE + U300_TIMER_APP_GPT1IA);
+                u300_timer_base + U300_TIMER_APP_GPT1IA);
         evt->event_handler(evt);
         return IRQ_HANDLED;
 }
@@ -343,12 +348,12 @@ static struct irqaction u300_timer_irq = {
 
 static u32 notrace u300_read_sched_clock(void)
 {
-        return readl(U300_TIMER_APP_VBASE + U300_TIMER_APP_GPT2CC);
+        return readl(u300_timer_base + U300_TIMER_APP_GPT2CC);
 }
 
 static unsigned long u300_read_current_timer(void)
 {
-        return readl(U300_TIMER_APP_VBASE + U300_TIMER_APP_GPT2CC);
+        return readl(u300_timer_base + U300_TIMER_APP_GPT2CC);
 }
 
 static struct delay_timer u300_delay_timer;
@@ -356,11 +361,14 @@ static struct delay_timer u300_delay_timer;
 /*
  * This sets up the system timers, clock source and clock event.
  */
-void __init u300_timer_init(void)
+static void __init u300_timer_setup(void __iomem *base, int irq)
 {
         struct clk *clk;
         unsigned long rate;
 
+        u300_timer_base = base;
+        pr_info("U300 GP1 timer @ base: %p, IRQ: %d\n", u300_timer_base, irq);
+
         /* Clock the interrupt controller */
         clk = clk_get_sys("apptimer", NULL);
         BUG_ON(IS_ERR(clk));
@@ -378,40 +386,40 @@ void __init u300_timer_init(void)
          * Example usage in cnh1601578 cpu subsystem pd_timer_app.c
          */
         writel(U300_TIMER_APP_CRC_CLOCK_REQUEST_ENABLE,
-                U300_TIMER_APP_VBASE + U300_TIMER_APP_CRC);
+                u300_timer_base + U300_TIMER_APP_CRC);
         writel(U300_TIMER_APP_ROST_TIMER_RESET,
-                U300_TIMER_APP_VBASE + U300_TIMER_APP_ROST);
+                u300_timer_base + U300_TIMER_APP_ROST);
         writel(U300_TIMER_APP_DOST_TIMER_DISABLE,
-                U300_TIMER_APP_VBASE + U300_TIMER_APP_DOST);
+                u300_timer_base + U300_TIMER_APP_DOST);
         writel(U300_TIMER_APP_RDDT_TIMER_RESET,
-                U300_TIMER_APP_VBASE + U300_TIMER_APP_RDDT);
+                u300_timer_base + U300_TIMER_APP_RDDT);
         writel(U300_TIMER_APP_DDDT_TIMER_DISABLE,
-                U300_TIMER_APP_VBASE + U300_TIMER_APP_DDDT);
+                u300_timer_base + U300_TIMER_APP_DDDT);
 
         /* Reset the General Purpose timer 1. */
         writel(U300_TIMER_APP_RGPT1_TIMER_RESET,
-                U300_TIMER_APP_VBASE + U300_TIMER_APP_RGPT1);
+                u300_timer_base + U300_TIMER_APP_RGPT1);
 
         /* Set up the IRQ handler */
-        setup_irq(IRQ_U300_TIMER_APP_GP1, &u300_timer_irq);
+        setup_irq(irq, &u300_timer_irq);
 
         /* Reset the General Purpose timer 2 */
         writel(U300_TIMER_APP_RGPT2_TIMER_RESET,
-                U300_TIMER_APP_VBASE + U300_TIMER_APP_RGPT2);
+                u300_timer_base + U300_TIMER_APP_RGPT2);
         /* Set this timer to run around forever */
-        writel(0xFFFFFFFFU, U300_TIMER_APP_VBASE + U300_TIMER_APP_GPT2TC);
+        writel(0xFFFFFFFFU, u300_timer_base + U300_TIMER_APP_GPT2TC);
         /* Set continuous mode so it wraps around */
         writel(U300_TIMER_APP_SGPT2M_MODE_CONTINUOUS,
-               U300_TIMER_APP_VBASE + U300_TIMER_APP_SGPT2M);
+               u300_timer_base + U300_TIMER_APP_SGPT2M);
         /* Disable timer interrupts */
         writel(U300_TIMER_APP_GPT2IE_IRQ_DISABLE,
-                U300_TIMER_APP_VBASE + U300_TIMER_APP_GPT2IE);
+                u300_timer_base + U300_TIMER_APP_GPT2IE);
         /* Then enable the GP2 timer to use as a free running us counter */
         writel(U300_TIMER_APP_EGPT2_TIMER_ENABLE,
-                U300_TIMER_APP_VBASE + U300_TIMER_APP_EGPT2);
+                u300_timer_base + U300_TIMER_APP_EGPT2);
 
         /* Use general purpose timer 2 as clock source */
-        if (clocksource_mmio_init(U300_TIMER_APP_VBASE + U300_TIMER_APP_GPT2CC,
+        if (clocksource_mmio_init(u300_timer_base + U300_TIMER_APP_GPT2CC,
                         "GPT2", rate, 300, 32, clocksource_mmio_readl_up))
                 pr_err("timer: failed to initialize U300 clock source\n");
 
@@ -424,3 +432,28 @@ void __init u300_timer_init(void)
          * used by hrtimers!
          */
 }
+
+
+void __init u300_timer_init()
+{
+        u300_timer_setup(U300_TIMER_APP_VBASE, IRQ_U300_TIMER_APP_GP1);
+}
+
+#ifdef CONFIG_OF
+
+static void __init u300_timer_init_of(struct device_node *np)
+{
+        void __iomem *base;
+        struct resource irq_res;
+        int irq;
+
+        base = of_iomap(np, 0);
+        /* Get the IRQ for the GP1 timer */
+        irq = of_irq_to_resource(np, 2, &irq_res);
+        u300_timer_setup(base, irq);
+}
+
+CLOCKSOURCE_OF_DECLARE(u300_timer, "stericsson,u300-apptimer",
+                       u300_timer_init_of);
+
+#endif
diff --git a/arch/arm/mach-u300/timer.h b/arch/arm/mach-u300/timer.h
index d34287bc34f5..7766dfa6979d 100644
--- a/arch/arm/mach-u300/timer.h
+++ b/arch/arm/mach-u300/timer.h
@@ -1 +1,2 @@
 extern void u300_timer_init(void);
+