#include <linux/interrupt.h>
#include <linux/clocksource.h>
#include <linux/clockchips.h>
-#include <linux/spinlock.h>
+#include <linux/io.h>
+#include <linux/clk.h>
+#include <linux/err.h>
+#include <linux/platform_device.h>
-#include <asm/io.h>
-#include <asm/arch/hardware.h>
-#include <asm/system.h>
-#include <asm/irq.h>
+#include <mach/hardware.h>
#include <asm/mach/irq.h>
#include <asm/mach/time.h>
-#include <asm/errno.h>
-#include <asm/arch/io.h>
+#include <mach/cputype.h>
+#include <mach/time.h>
+#include "clock.h"
static struct clock_event_device clockevent_davinci;
-
-#define DAVINCI_TIMER0_BASE (IO_PHYS + 0x21400)
-#define DAVINCI_TIMER1_BASE (IO_PHYS + 0x21800)
-#define DAVINCI_WDOG_BASE (IO_PHYS + 0x21C00)
-
-enum {
- T0_BOT = 0, T0_TOP, T1_BOT, T1_TOP, NUM_TIMERS,
-};
-
-#define IS_TIMER1(id) (id & 0x2)
-#define IS_TIMER0(id) (!IS_TIMER1(id))
-#define IS_TIMER_TOP(id) ((id & 0x1))
-#define IS_TIMER_BOT(id) (!IS_TIMER_TOP(id))
-
-static int timer_irqs[NUM_TIMERS] = {
- IRQ_TINT0_TINT12,
- IRQ_TINT0_TINT34,
- IRQ_TINT1_TINT12,
- IRQ_TINT1_TINT34,
-};
+static unsigned int davinci_clock_tick_rate;
/*
* This driver configures the 2 64-bit count-up timers as 4 independent
* 32-bit count-up timers used as follows:
- *
- * T0_BOT: Timer 0, bottom: clockevent source for hrtimers
- * T0_TOP: Timer 0, top : clocksource for generic timekeeping
- * T1_BOT: Timer 1, bottom: (used by DSP in TI DSPLink code)
- * T1_TOP: Timer 1, top : <unused>
*/
-#define TID_CLOCKEVENT T0_BOT
-#define TID_CLOCKSOURCE T0_TOP
+
+enum {
+ TID_CLOCKEVENT,
+ TID_CLOCKSOURCE,
+};
/* Timer register offsets */
-#define PID12 0x0
-#define TIM12 0x10
-#define TIM34 0x14
-#define PRD12 0x18
-#define PRD34 0x1c
-#define TCR 0x20
-#define TGCR 0x24
-#define WDTCR 0x28
+#define PID12 0x0
+#define TIM12 0x10
+#define TIM34 0x14
+#define PRD12 0x18
+#define PRD34 0x1c
+#define TCR 0x20
+#define TGCR 0x24
+#define WDTCR 0x28
+
+/* Offsets of the 8 compare registers */
+#define CMP12_0 0x60
+#define CMP12_1 0x64
+#define CMP12_2 0x68
+#define CMP12_3 0x6c
+#define CMP12_4 0x70
+#define CMP12_5 0x74
+#define CMP12_6 0x78
+#define CMP12_7 0x7c
/* Timer register bitfields */
#define TCR_ENAMODE_DISABLE 0x0
unsigned int id;
unsigned long period;
unsigned long opts;
- unsigned long reg_base;
- unsigned long tim_reg;
- unsigned long prd_reg;
+ unsigned long flags;
+ void __iomem *base;
+ unsigned long tim_off;
+ unsigned long prd_off;
unsigned long enamode_shift;
struct irqaction irqaction;
};
static struct timer_s timers[];
/* values for 'opts' field of struct timer_s */
-#define TIMER_OPTS_DISABLED 0x00
-#define TIMER_OPTS_ONESHOT 0x01
-#define TIMER_OPTS_PERIODIC 0x02
+#define TIMER_OPTS_DISABLED 0x01
+#define TIMER_OPTS_ONESHOT 0x02
+#define TIMER_OPTS_PERIODIC 0x04
+#define TIMER_OPTS_STATE_MASK 0x07
+
+#define TIMER_OPTS_USE_COMPARE 0x80000000
+#define USING_COMPARE(t) ((t)->opts & TIMER_OPTS_USE_COMPARE)
+
+static char *id_to_name[] = {
+ [T0_BOT] = "timer0_0",
+ [T0_TOP] = "timer0_1",
+ [T1_BOT] = "timer1_0",
+ [T1_TOP] = "timer1_1",
+};
static int timer32_config(struct timer_s *t)
{
- u32 tcr = davinci_readl(t->reg_base + TCR);
-
- /* disable timer */
- tcr &= ~(TCR_ENAMODE_MASK << t->enamode_shift);
- davinci_writel(tcr, t->reg_base + TCR);
-
- /* reset counter to zero, set new period */
- davinci_writel(0, t->tim_reg);
- davinci_writel(t->period, t->prd_reg);
-
- /* Set enable mode */
- if (t->opts & TIMER_OPTS_ONESHOT) {
- tcr |= TCR_ENAMODE_ONESHOT << t->enamode_shift;
- } else if (t->opts & TIMER_OPTS_PERIODIC) {
- tcr |= TCR_ENAMODE_PERIODIC << t->enamode_shift;
+ u32 tcr;
+ struct davinci_soc_info *soc_info = &davinci_soc_info;
+
+ if (USING_COMPARE(t)) {
+ struct davinci_timer_instance *dtip =
+ soc_info->timer_info->timers;
+ int event_timer = ID_TO_TIMER(timers[TID_CLOCKEVENT].id);
+
+ /*
+ * Next interrupt should be the current time reg value plus
+ * the new period (using 32-bit unsigned addition/wrapping
+ * to 0 on overflow). This assumes that the clocksource
+ * is setup to count to 2^32-1 before wrapping around to 0.
+ */
+ __raw_writel(__raw_readl(t->base + t->tim_off) + t->period,
+ t->base + dtip[event_timer].cmp_off);
+ } else {
+ tcr = __raw_readl(t->base + TCR);
+
+ /* disable timer */
+ tcr &= ~(TCR_ENAMODE_MASK << t->enamode_shift);
+ __raw_writel(tcr, t->base + TCR);
+
+ /* reset counter to zero, set new period */
+ __raw_writel(0, t->base + t->tim_off);
+ __raw_writel(t->period, t->base + t->prd_off);
+
+ /* Set enable mode */
+ if (t->opts & TIMER_OPTS_ONESHOT)
+ tcr |= TCR_ENAMODE_ONESHOT << t->enamode_shift;
+ else if (t->opts & TIMER_OPTS_PERIODIC)
+ tcr |= TCR_ENAMODE_PERIODIC << t->enamode_shift;
+
+ __raw_writel(tcr, t->base + TCR);
}
-
- davinci_writel(tcr, t->reg_base + TCR);
return 0;
}
static inline u32 timer32_read(struct timer_s *t)
{
- return davinci_readl(t->tim_reg);
+ return __raw_readl(t->base + t->tim_off);
}
static irqreturn_t timer_interrupt(int irq, void *dev_id)
static void __init timer_init(void)
{
- u32 bases[] = {DAVINCI_TIMER0_BASE, DAVINCI_TIMER1_BASE};
+ struct davinci_soc_info *soc_info = &davinci_soc_info;
+ struct davinci_timer_instance *dtip = soc_info->timer_info->timers;
int i;
/* Global init of each 64-bit timer as a whole */
for(i=0; i<2; i++) {
- u32 tgcr, base = bases[i];
+ u32 tgcr;
+ void __iomem *base = dtip[i].base;
/* Disabled, Internal clock source */
- davinci_writel(0, base + TCR);
+ __raw_writel(0, base + TCR);
/* reset both timers, no pre-scaler for timer34 */
tgcr = 0;
- davinci_writel(tgcr, base + TGCR);
+ __raw_writel(tgcr, base + TGCR);
/* Set both timers to unchained 32-bit */
tgcr = TGCR_TIMMODE_32BIT_UNCHAINED << TGCR_TIMMODE_SHIFT;
- davinci_writel(tgcr, base + TGCR);
+ __raw_writel(tgcr, base + TGCR);
/* Unreset timers */
tgcr |= (TGCR_UNRESET << TGCR_TIM12RS_SHIFT) |
(TGCR_UNRESET << TGCR_TIM34RS_SHIFT);
- davinci_writel(tgcr, base + TGCR);
+ __raw_writel(tgcr, base + TGCR);
/* Init both counters to zero */
- davinci_writel(0, base + TIM12);
- davinci_writel(0, base + TIM34);
+ __raw_writel(0, base + TIM12);
+ __raw_writel(0, base + TIM34);
}
/* Init of each timer as a 32-bit timer */
for (i=0; i< ARRAY_SIZE(timers); i++) {
struct timer_s *t = &timers[i];
+ int timer = ID_TO_TIMER(t->id);
+ u32 irq;
+
+ t->base = dtip[timer].base;
+
+ if (IS_TIMER_BOT(t->id)) {
+ t->enamode_shift = 6;
+ t->tim_off = TIM12;
+ t->prd_off = PRD12;
+ irq = dtip[timer].bottom_irq;
+ } else {
+ t->enamode_shift = 22;
+ t->tim_off = TIM34;
+ t->prd_off = PRD34;
+ irq = dtip[timer].top_irq;
+ }
+
+ /* Register interrupt */
+ t->irqaction.name = t->name;
+ t->irqaction.dev_id = (void *)t;
- if (t->name) {
- t->id = i;
- t->reg_base = (IS_TIMER1(t->id) ?
- DAVINCI_TIMER1_BASE : DAVINCI_TIMER0_BASE);
-
- if (IS_TIMER_BOT(t->id)) {
- t->enamode_shift = 6;
- t->tim_reg = t->reg_base + TIM12;
- t->prd_reg = t->reg_base + PRD12;
- } else {
- t->enamode_shift = 22;
- t->tim_reg = t->reg_base + TIM34;
- t->prd_reg = t->reg_base + PRD34;
- }
-
- /* Register interrupt */
- t->irqaction.name = t->name;
- t->irqaction.dev_id = (void *)t;
- if (t->irqaction.handler != NULL) {
- setup_irq(timer_irqs[t->id], &t->irqaction);
- }
-
- timer32_config(&timers[i]);
+ if (t->irqaction.handler != NULL) {
+ irq = USING_COMPARE(t) ? dtip[i].cmp_irq : irq;
+ setup_irq(irq, &t->irqaction);
}
+
+ timer32_config(&timers[i]);
}
}
/*
* clocksource
*/
-static cycle_t read_cycles(void)
+static cycle_t read_cycles(struct clocksource *cs)
{
struct timer_s *t = &timers[TID_CLOCKSOURCE];
}
static struct clocksource clocksource_davinci = {
- .name = "timer0_1",
.rating = 300,
.read = read_cycles,
.mask = CLOCKSOURCE_MASK(32),
switch (mode) {
case CLOCK_EVT_MODE_PERIODIC:
- t->period = CLOCK_TICK_RATE / (HZ);
- t->opts = TIMER_OPTS_PERIODIC;
+ t->period = davinci_clock_tick_rate / (HZ);
+ t->opts &= ~TIMER_OPTS_STATE_MASK;
+ t->opts |= TIMER_OPTS_PERIODIC;
timer32_config(t);
break;
case CLOCK_EVT_MODE_ONESHOT:
- t->opts = TIMER_OPTS_ONESHOT;
+ t->opts &= ~TIMER_OPTS_STATE_MASK;
+ t->opts |= TIMER_OPTS_ONESHOT;
break;
case CLOCK_EVT_MODE_UNUSED:
case CLOCK_EVT_MODE_SHUTDOWN:
- t->opts = TIMER_OPTS_DISABLED;
+ t->opts &= ~TIMER_OPTS_STATE_MASK;
+ t->opts |= TIMER_OPTS_DISABLED;
break;
case CLOCK_EVT_MODE_RESUME:
break;
}
static struct clock_event_device clockevent_davinci = {
- .name = "timer0_0",
.features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT,
.shift = 32,
.set_next_event = davinci_set_next_event,
static void __init davinci_timer_init(void)
{
+ struct clk *timer_clk;
+ struct davinci_soc_info *soc_info = &davinci_soc_info;
+ unsigned int clockevent_id;
+ unsigned int clocksource_id;
static char err[] __initdata = KERN_ERR
"%s: can't register clocksource!\n";
+ clockevent_id = soc_info->timer_info->clockevent_id;
+ clocksource_id = soc_info->timer_info->clocksource_id;
+
+ timers[TID_CLOCKEVENT].id = clockevent_id;
+ timers[TID_CLOCKSOURCE].id = clocksource_id;
+
+ /*
+ * If using same timer for both clock events & clocksource,
+ * a compare register must be used to generate an event interrupt.
+ * This is equivalent to a oneshot timer only (not periodic).
+ */
+ if (clockevent_id == clocksource_id) {
+ struct davinci_timer_instance *dtip =
+ soc_info->timer_info->timers;
+ int event_timer = ID_TO_TIMER(clockevent_id);
+
+ /* Only bottom timers can use compare regs */
+ if (IS_TIMER_TOP(clockevent_id))
+ pr_warning("davinci_timer_init: Invalid use"
+ " of system timers. Results unpredictable.\n");
+ else if ((dtip[event_timer].cmp_off == 0)
+ || (dtip[event_timer].cmp_irq == 0))
+ pr_warning("davinci_timer_init: Invalid timer instance"
+ " setup. Results unpredictable.\n");
+ else {
+ timers[TID_CLOCKEVENT].opts |= TIMER_OPTS_USE_COMPARE;
+ clockevent_davinci.features = CLOCK_EVT_FEAT_ONESHOT;
+ }
+ }
+
/* init timer hw */
timer_init();
+ timer_clk = clk_get(NULL, "timer0");
+ BUG_ON(IS_ERR(timer_clk));
+ clk_enable(timer_clk);
+
+ davinci_clock_tick_rate = clk_get_rate(timer_clk);
+
/* setup clocksource */
+ clocksource_davinci.name = id_to_name[clocksource_id];
clocksource_davinci.mult =
- clocksource_khz2mult(CLOCK_TICK_RATE/1000,
+ clocksource_khz2mult(davinci_clock_tick_rate/1000,
clocksource_davinci.shift);
if (clocksource_register(&clocksource_davinci))
printk(err, clocksource_davinci.name);
/* setup clockevent */
- clockevent_davinci.mult = div_sc(CLOCK_TICK_RATE, NSEC_PER_SEC,
+ clockevent_davinci.name = id_to_name[timers[TID_CLOCKEVENT].id];
+ clockevent_davinci.mult = div_sc(davinci_clock_tick_rate, NSEC_PER_SEC,
clockevent_davinci.shift);
clockevent_davinci.max_delta_ns =
clockevent_delta2ns(0xfffffffe, &clockevent_davinci);
- clockevent_davinci.min_delta_ns =
- clockevent_delta2ns(1, &clockevent_davinci);
+ clockevent_davinci.min_delta_ns = 50000; /* 50 usec */
- clockevent_davinci.cpumask = cpumask_of_cpu(0);
+ clockevent_davinci.cpumask = cpumask_of(0);
clockevents_register_device(&clockevent_davinci);
}
/* reset board using watchdog timer */
-void davinci_watchdog_reset(void) {
- u32 tgcr, wdtcr, base = DAVINCI_WDOG_BASE;
+void davinci_watchdog_reset(void)
+{
+ u32 tgcr, wdtcr;
+ struct platform_device *pdev = &davinci_wdt_device;
+ void __iomem *base = IO_ADDRESS(pdev->resource[0].start);
+ struct clk *wd_clk;
+
+ wd_clk = clk_get(&pdev->dev, NULL);
+ if (WARN_ON(IS_ERR(wd_clk)))
+ return;
+ clk_enable(wd_clk);
/* disable, internal clock source */
- davinci_writel(0, base + TCR);
+ __raw_writel(0, base + TCR);
/* reset timer, set mode to 64-bit watchdog, and unreset */
tgcr = 0;
- davinci_writel(tgcr, base + TCR);
+ __raw_writel(tgcr, base + TGCR);
tgcr = TGCR_TIMMODE_64BIT_WDOG << TGCR_TIMMODE_SHIFT;
tgcr |= (TGCR_UNRESET << TGCR_TIM12RS_SHIFT) |
(TGCR_UNRESET << TGCR_TIM34RS_SHIFT);
- davinci_writel(tgcr, base + TCR);
+ __raw_writel(tgcr, base + TGCR);
/* clear counter and period regs */
- davinci_writel(0, base + TIM12);
- davinci_writel(0, base + TIM34);
- davinci_writel(0, base + PRD12);
- davinci_writel(0, base + PRD34);
-
- /* enable */
- wdtcr = davinci_readl(base + WDTCR);
- wdtcr |= WDTCR_WDEN_ENABLE << WDTCR_WDEN_SHIFT;
- davinci_writel(wdtcr, base + WDTCR);
+ __raw_writel(0, base + TIM12);
+ __raw_writel(0, base + TIM34);
+ __raw_writel(0, base + PRD12);
+ __raw_writel(0, base + PRD34);
/* put watchdog in pre-active state */
+ wdtcr = __raw_readl(base + WDTCR);
wdtcr = (WDTCR_WDKEY_SEQ0 << WDTCR_WDKEY_SHIFT) |
(WDTCR_WDEN_ENABLE << WDTCR_WDEN_SHIFT);
- davinci_writel(wdtcr, base + WDTCR);
+ __raw_writel(wdtcr, base + WDTCR);
/* put watchdog in active state */
wdtcr = (WDTCR_WDKEY_SEQ1 << WDTCR_WDKEY_SHIFT) |
(WDTCR_WDEN_ENABLE << WDTCR_WDEN_SHIFT);
- davinci_writel(wdtcr, base + WDTCR);
+ __raw_writel(wdtcr, base + WDTCR);
/* write an invalid value to the WDKEY field to trigger
* a watchdog reset */
wdtcr = 0x00004000;
- davinci_writel(wdtcr, base + WDTCR);
+ __raw_writel(wdtcr, base + WDTCR);
}
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