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ARM: bcmring: convert to use sp804 clockevents

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bcmring has a set of four sp804 timers incorporated, yet it has its
own copy of the sp804 code.  Convert its clockevent implementation
to the standard sp804 support code.

Cc: Jiandong Zheng <jdzheng@broadcom.com>
Cc: Scott Branden <sbranden@broadcom.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Russell King 2011-05-12 15:51:29 +01:00
parent 82d63734ea
commit e8765afe54
1 changed files with 8 additions and 110 deletions
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118
arch/arm/mach-bcmring/core.c
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@ -28,8 +28,6 @@
#include <linux/sysdev.h>
#include <linux/interrupt.h>
#include <linux/amba/bus.h>
#include <linux/clocksource.h>
#include <linux/clockchips.h>
#include <linux/clkdev.h>
#include <mach/csp/mm_addr.h>
@ -113,8 +111,8 @@ static struct clk dummy_apb_pclk = {
#define TIMER3_FREQUENCY_KHZ (tmrHw_HIGH_FREQUENCY_HZ / 1000)
#endif
static struct clk sp804_timer1_clk = {
.name = "sp804-timer-1",
static struct clk sp804_timer012_clk = {
.name = "sp804-timer-0,1,2",
.type = CLK_TYPE_PRIMARY,
.mode = CLK_MODE_XTAL,
.rate_hz = TIMER1_FREQUENCY_MHZ * 1000000,
@ -137,10 +135,14 @@ static struct clk_lookup lookups[] = {
}, { /* UART1 */
.dev_id = "uartb",
.clk = &uart_clk,
}, { /* SP804 timer 0 */
.dev_id = "sp804",
.con_id = "timer0",
.clk = &sp804_timer012_clk,
}, { /* SP804 timer 1 */
.dev_id = "sp804",
.con_id = "timer1",
.clk = &sp804_timer1_clk,
.clk = &sp804_timer012_clk,
}, { /* SP804 timer 3 */
.dev_id = "sp804",
.con_id = "timer3",
@ -203,100 +205,6 @@ void __init bcmring_amba_init(void)
#define TIMER2_VA_BASE ((void __iomem *)(MM_IO_BASE_TMR + 0x40))
#define TIMER3_VA_BASE ((void __iomem *)(MM_IO_BASE_TMR + 0x60))
#define TICKS_PER_uSEC TIMER0_FREQUENCY_MHZ
/*
* These are useconds NOT ticks.
*
*/
#define mSEC_1 1000
#define mSEC_10 (mSEC_1 * 10)
/*
* How long is the timer interval?
*/
#define TIMER_INTERVAL (TICKS_PER_uSEC * mSEC_10)
#if TIMER_INTERVAL >= 0x100000
#define TIMER_RELOAD (TIMER_INTERVAL >> 8)
#define TIMER_DIVISOR (TIMER_CTRL_DIV256)
#define TICKS2USECS(x) (256 * (x) / TICKS_PER_uSEC)
#elif TIMER_INTERVAL >= 0x10000
#define TIMER_RELOAD (TIMER_INTERVAL >> 4) /* Divide by 16 */
#define TIMER_DIVISOR (TIMER_CTRL_DIV16)
#define TICKS2USECS(x) (16 * (x) / TICKS_PER_uSEC)
#else
#define TIMER_RELOAD (TIMER_INTERVAL)
#define TIMER_DIVISOR (TIMER_CTRL_DIV1)
#define TICKS2USECS(x) ((x) / TICKS_PER_uSEC)
#endif
static void timer_set_mode(enum clock_event_mode mode,
struct clock_event_device *clk)
{
unsigned long ctrl;
switch (mode) {
case CLOCK_EVT_MODE_PERIODIC:
writel(TIMER_RELOAD, TIMER0_VA_BASE + TIMER_LOAD);
ctrl = TIMER_CTRL_PERIODIC;
ctrl |=
TIMER_DIVISOR | TIMER_CTRL_32BIT | TIMER_CTRL_IE |
TIMER_CTRL_ENABLE;
break;
case CLOCK_EVT_MODE_ONESHOT:
/* period set, and timer enabled in 'next_event' hook */
ctrl = TIMER_CTRL_ONESHOT;
ctrl |= TIMER_DIVISOR | TIMER_CTRL_32BIT | TIMER_CTRL_IE;
break;
case CLOCK_EVT_MODE_UNUSED:
case CLOCK_EVT_MODE_SHUTDOWN:
default:
ctrl = 0;
}
writel(ctrl, TIMER0_VA_BASE + TIMER_CTRL);
}
static int timer_set_next_event(unsigned long evt,
struct clock_event_device *unused)
{
unsigned long ctrl = readl(TIMER0_VA_BASE + TIMER_CTRL);
writel(evt, TIMER0_VA_BASE + TIMER_LOAD);
writel(ctrl | TIMER_CTRL_ENABLE, TIMER0_VA_BASE + TIMER_CTRL);
return 0;
}
static struct clock_event_device timer0_clockevent = {
.name = "timer0",
.shift = 32,
.features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT,
.set_mode = timer_set_mode,
.set_next_event = timer_set_next_event,
};
/*
* IRQ handler for the timer
*/
static irqreturn_t bcmring_timer_interrupt(int irq, void *dev_id)
{
struct clock_event_device *evt = &timer0_clockevent;
writel(1, TIMER0_VA_BASE + TIMER_INTCLR);
evt->event_handler(evt);
return IRQ_HANDLED;
}
static struct irqaction bcmring_timer_irq = {
.name = "bcmring Timer Tick",
.flags = IRQF_DISABLED | IRQF_TIMER | IRQF_IRQPOLL,
.handler = bcmring_timer_interrupt,
};
static int __init bcmring_clocksource_init(void)
{
/* setup timer1 as free-running clocksource */
@ -325,19 +233,9 @@ void __init bcmring_init_timer(void)
/*
* Make irqs happen for the system timer
*/
setup_irq(IRQ_TIMER0, &bcmring_timer_irq);
bcmring_clocksource_init();
timer0_clockevent.mult =
div_sc(1000000, NSEC_PER_SEC, timer0_clockevent.shift);
timer0_clockevent.max_delta_ns =
clockevent_delta2ns(0xffffffff, &timer0_clockevent);
timer0_clockevent.min_delta_ns =
clockevent_delta2ns(0xf, &timer0_clockevent);
timer0_clockevent.cpumask = cpumask_of(0);
clockevents_register_device(&timer0_clockevent);
sp804_clockevents_register(TIMER0_VA_BASE, IRQ_TIMER0, "timer0");
}
struct sys_timer bcmring_timer = {