new file mode 100644
@@ -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>;
+};
@@ -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
@@ -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
@@ -1 +1,2 @@
extern void u300_timer_init(void);
+