Atmel TCLIB: Allow higher clock rates for clock events

As default the TCLIB uses the 32KiHz base clock rate for clock events.
Add a compile time selection to allow higher clock resulution.

Signed-off-by: Benedikt Spranger <b.spranger@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

2 files changed, 35 insertions, 20 deletions

diff --git a/drivers/clocksource/tcb_clksrc.c b/drivers/clocksource/tcb_clksrc.c
index 01b886e68822..90350b6612bb 100644
--- a/drivers/clocksource/tcb_clksrc.c
+++ b/drivers/clocksource/tcb_clksrc.c
@@ -21,8 +21,7 @@
  *     resolution better than 200 nsec).
  *
  *   - The third channel may be used to provide a 16-bit clockevent
- *     source, used in either periodic or oneshot mode.  This runs
- *     at 32 KiHZ, and can handle delays of up to two seconds.
+ *     source, used in either periodic or oneshot mode.
  *
  * A boot clocksource and clockevent source are also currently needed,
  * unless the relevant platforms (ARM/AT91, AVR32/AT32) are changed so
@@ -68,6 +67,7 @@ static struct clocksource clksrc = {
 struct tc_clkevt_device {
         struct clock_event_device       clkevt;
         struct clk                      *clk;
+        u32                             freq;
         void __iomem                    *regs;
 };
 
@@ -76,13 +76,6 @@ static struct tc_clkevt_device *to_tc_clkevt(struct clock_event_device *clkevt)
         return container_of(clkevt, struct tc_clkevt_device, clkevt);
 }
 
-/* For now, we always use the 32K clock ... this optimizes for NO_HZ,
- * because using one of the divided clocks would usually mean the
- * tick rate can never be less than several dozen Hz (vs 0.5 Hz).
- *
- * A divided clock could be good for high resolution timers, since
- * 30.5 usec resolution can seem "low".
- */
 static u32 timer_clock;
 
 static void tc_mode(enum clock_event_mode m, struct clock_event_device *d)
@@ -105,11 +98,12 @@ static void tc_mode(enum clock_event_mode m, struct clock_event_device *d)
         case CLOCK_EVT_MODE_PERIODIC:
                 clk_enable(tcd->clk);
 
-                /* slow clock, count up to RC, then irq and restart */
+                /* count up to RC, then irq and restart */
                 __raw_writel(timer_clock
                                 | ATMEL_TC_WAVE | ATMEL_TC_WAVESEL_UP_AUTO,
                                 regs + ATMEL_TC_REG(2, CMR));
-                __raw_writel((32768 + HZ/2) / HZ, tcaddr + ATMEL_TC_REG(2, RC));
+                __raw_writel((tcd->freq + HZ/2)/HZ,
+                             tcaddr + ATMEL_TC_REG(2, RC));
 
                 /* Enable clock and interrupts on RC compare */
                 __raw_writel(ATMEL_TC_CPCS, regs + ATMEL_TC_REG(2, IER));
@@ -122,7 +116,7 @@ static void tc_mode(enum clock_event_mode m, struct clock_event_device *d)
         case CLOCK_EVT_MODE_ONESHOT:
                 clk_enable(tcd->clk);
 
-                /* slow clock, count up to RC, then irq and stop */
+                /* count up to RC, then irq and stop */
                 __raw_writel(timer_clock | ATMEL_TC_CPCSTOP
                                 | ATMEL_TC_WAVE | ATMEL_TC_WAVESEL_UP_AUTO,
                                 regs + ATMEL_TC_REG(2, CMR));
@@ -152,8 +146,12 @@ static struct tc_clkevt_device clkevt = {
                 .features       = CLOCK_EVT_FEAT_PERIODIC
                                         | CLOCK_EVT_FEAT_ONESHOT,
                 .shift          = 32,
+#ifdef CONFIG_ATMEL_TCB_CLKSRC_USE_SLOW_CLOCK
                 /* Should be lower than at91rm9200's system timer */
                 .rating         = 125,
+#else
+                .rating         = 200,
+#endif
                 .set_next_event = tc_next_event,
                 .set_mode       = tc_mode,
         },
@@ -179,8 +177,9 @@ static struct irqaction tc_irqaction = {
         .handler        = ch2_irq,
 };
 
-static void __init setup_clkevents(struct atmel_tc *tc, int clk32k_divisor_idx)
+static void __init setup_clkevents(struct atmel_tc *tc, int divisor_idx)
 {
+        unsigned divisor = atmel_tc_divisors[divisor_idx];
         struct clk *t2_clk = tc->clk[2];
         int irq = tc->irq[2];
 
@@ -188,11 +187,17 @@ static void __init setup_clkevents(struct atmel_tc *tc, int clk32k_divisor_idx)
         clkevt.clk = t2_clk;
         tc_irqaction.dev_id = &clkevt;
 
-        timer_clock = clk32k_divisor_idx;
+        timer_clock = divisor_idx;
 
-        clkevt.clkevt.mult = div_sc(32768, NSEC_PER_SEC, clkevt.clkevt.shift);
-        clkevt.clkevt.max_delta_ns
-                = clockevent_delta2ns(0xffff, &clkevt.clkevt);
+        if (!divisor)
+                clkevt.freq = 32768;
+        else
+                clkevt.freq = clk_get_rate(t2_clk)/divisor;
+
+        clkevt.clkevt.mult = div_sc(clkevt.freq, NSEC_PER_SEC,
+                                    clkevt.clkevt.shift);
+        clkevt.clkevt.max_delta_ns =
+                clockevent_delta2ns(0xffff, &clkevt.clkevt);
         clkevt.clkevt.min_delta_ns = clockevent_delta2ns(1, &clkevt.clkevt) + 1;
         clkevt.clkevt.cpumask = cpumask_of(0);
 
@@ -295,8 +300,11 @@ static int __init tcb_clksrc_init(void)
         clocksource_register(&clksrc);
 
         /* channel 2:  periodic and oneshot timer support */
+#ifdef CONFIG_ATMEL_TCB_CLKSRC_USE_SLOW_CLOCK
         setup_clkevents(tc, clk32k_divisor_idx);
-
+#else
+        setup_clkevents(tc, best_divisor_idx);
+#endif
         return 0;
 }
 arch_initcall(tcb_clksrc_init);
diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig
index 9eaa6477cec2..3f3a4c864735 100644
--- a/drivers/misc/Kconfig
+++ b/drivers/misc/Kconfig
@@ -54,8 +54,7 @@ config ATMEL_TCB_CLKSRC
           are combined to make a single 32-bit timer.
 
           When GENERIC_CLOCKEVENTS is defined, the third timer channel
-          may be used as a clock event device supporting oneshot mode
-          (delays of up to two seconds) based on the 32 KiHz clock.
+          may be used as a clock event device supporting oneshot mode.
 
 config ATMEL_TCB_CLKSRC_BLOCK
         int
@@ -69,6 +68,14 @@ config ATMEL_TCB_CLKSRC_BLOCK
           TC can be used for other purposes, such as PWM generation and
           interval timing.
 
+config ATMEL_TCB_CLKSRC_USE_SLOW_CLOCK
+        bool "TC Block use 32 KiHz clock"
+        depends on ATMEL_TCB_CLKSRC
+        default y
+        help
+          Select this to use 32 KiHz base clock rate as TC block clock
+          source for clock events.
+
 config IBM_ASM
         tristate "Device driver for IBM RSA service processor"
         depends on X86 && PCI && INPUT && EXPERIMENTAL