MIPS: Alchemy: RTC counter clocksource / clockevent support.

Add support for the 32 kHz counter1 (RTC) as clocksource / clockevent
device.  As a nice side effect, this also enables use of the 'wait'
instruction for runtime idle power savings.

If the counters aren't enabled/working properly, fall back on the
cp0 counter clock code.

Signed-off-by: Manuel Lauss <mano@roarinelk.homelinux.net>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

1 files changed, 123 insertions, 169 deletions

diff --git a/arch/mips/alchemy/common/time.c b/arch/mips/alchemy/common/time.c
index 15185708ad8c..57f0aec590b8 100644
--- a/arch/mips/alchemy/common/time.c
+++ b/arch/mips/alchemy/common/time.c
@@ -1,5 +1,7 @@
 /*
+ * Copyright (C) 2008 Manuel Lauss <mano@roarinelk.homelinux.net>
  *
+ * Previous incarnations were:
  * Copyright (C) 2001, 2006, 2008 MontaVista Software, <source@mvista.com>
  * Copied and modified Carsten Langgaard's time.c
  *
@@ -23,131 +25,27 @@
  *
  * ########################################################################
  *
- * Setting up the clock on the MIPS boards.
- *
- * We provide the clock interrupt processing and the timer offset compute
- * functions.  If CONFIG_PM is selected, we also ensure the 32KHz timer is
- * available.  -- Dan
+ * Clocksource/event using the 32.768kHz-clocked Counter1 ('RTC' in the
+ * databooks).  Firmware/Board init code must enable the counters in the
+ * counter control register, otherwise the CP0 counter clocksource/event
+ * will be installed instead (and use of 'wait' instruction is prohibited).
  */
 
-#include <linux/types.h>
-#include <linux/init.h>
+#include <linux/clockchips.h>
+#include <linux/clocksource.h>
+#include <linux/interrupt.h>
 #include <linux/spinlock.h>
 
-#include <asm/mipsregs.h>
 #include <asm/time.h>
 #include <asm/mach-au1x00/au1000.h>
 
-static int no_au1xxx_32khz;
-extern int allow_au1k_wait; /* default off for CP0 Counter */
+/* 32kHz clock enabled and detected */
+#define CNTR_OK (SYS_CNTRL_E0 | SYS_CNTRL_32S)
 
-#ifdef CONFIG_PM
-#if HZ < 100 || HZ > 1000
-#error "unsupported HZ value! Must be in [100,1000]"
-#endif
-#define MATCH20_INC (328 * 100 / HZ) /* magic number 328 is for HZ=100... */
-static unsigned long last_pc0, last_match20;
-#endif
+extern int allow_au1k_wait; /* default off for CP0 Counter */
 
 static DEFINE_SPINLOCK(time_lock);
 
-unsigned long wtimer;
-
-#ifdef CONFIG_PM
-static irqreturn_t counter0_irq(int irq, void *dev_id)
-{
-        unsigned long pc0;
-        int time_elapsed;
-        static int jiffie_drift;
-
-        if (au_readl(SYS_COUNTER_CNTRL) & SYS_CNTRL_M20) {
-                /* should never happen! */
-                printk(KERN_WARNING "counter 0 w status error\n");
-                return IRQ_NONE;
-        }
-
-        pc0 = au_readl(SYS_TOYREAD);
-        if (pc0 < last_match20)
-                /* counter overflowed */
-                time_elapsed = (0xffffffff - last_match20) + pc0;
-        else
-                time_elapsed = pc0 - last_match20;
-
-        while (time_elapsed > 0) {
-                do_timer(1);
-#ifndef CONFIG_SMP
-                update_process_times(user_mode(get_irq_regs()));
-#endif
-                time_elapsed -= MATCH20_INC;
-                last_match20 += MATCH20_INC;
-                jiffie_drift++;
-        }
-
-        last_pc0 = pc0;
-        au_writel(last_match20 + MATCH20_INC, SYS_TOYMATCH2);
-        au_sync();
-
-        /*
-         * Our counter ticks at 10.009765625 ms/tick, we we're running
-         * almost 10 uS too slow per tick.
-         */
-
-        if (jiffie_drift >= 999) {
-                jiffie_drift -= 999;
-                do_timer(1); /* increment jiffies by one */
-#ifndef CONFIG_SMP
-                update_process_times(user_mode(get_irq_regs()));
-#endif
-        }
-
-        return IRQ_HANDLED;
-}
-
-struct irqaction counter0_action = {
-        .handler        = counter0_irq,
-        .flags          = IRQF_DISABLED,
-        .name           = "alchemy-toy",
-        .dev_id         = NULL,
-};
-
-/* When we wakeup from sleep, we have to "catch up" on all of the
- * timer ticks we have missed.
- */
-void wakeup_counter0_adjust(void)
-{
-        unsigned long pc0;
-        int time_elapsed;
-
-        pc0 = au_readl(SYS_TOYREAD);
-        if (pc0 < last_match20)
-                /* counter overflowed */
-                time_elapsed = (0xffffffff - last_match20) + pc0;
-        else
-                time_elapsed = pc0 - last_match20;
-
-        while (time_elapsed > 0) {
-                time_elapsed -= MATCH20_INC;
-                last_match20 += MATCH20_INC;
-        }
-
-        last_pc0 = pc0;
-        au_writel(last_match20 + MATCH20_INC, SYS_TOYMATCH2);
-        au_sync();
-
-}
-
-/* This is just for debugging to set the timer for a sleep delay. */
-void wakeup_counter0_set(int ticks)
-{
-        unsigned long pc0;
-
-        pc0 = au_readl(SYS_TOYREAD);
-        last_pc0 = pc0;
-        au_writel(last_match20 + (MATCH20_INC * ticks), SYS_TOYMATCH2);
-        au_sync();
-}
-#endif
-
 /*
  * I haven't found anyone that doesn't use a 12 MHz source clock,
  * but just in case.....
@@ -162,37 +60,15 @@ void wakeup_counter0_set(int ticks)
  * this advertised speed will introduce error and sometimes not work
  * properly.  This function is futher convoluted to still allow configurations
  * to do that in case they have really, really old silicon with a
- * write-only PLL register, that we need the 32 KHz when power management
- * "wait" is enabled, and we need to detect if the 32 KHz isn't present
- * but requested......got it? :-)               -- Dan
+ * write-only PLL register.                     -- Dan
  */
 unsigned long calc_clock(void)
 {
         unsigned long cpu_speed;
         unsigned long flags;
-        unsigned long counter;
 
         spin_lock_irqsave(&time_lock, flags);
 
-        /* Power management cares if we don't have a 32 KHz counter. */
-        no_au1xxx_32khz = 0;
-        counter = au_readl(SYS_COUNTER_CNTRL);
-        if (counter & SYS_CNTRL_E0) {
-                int trim_divide = 16;
-
-                au_writel(counter | SYS_CNTRL_EN1, SYS_COUNTER_CNTRL);
-
-                while (au_readl(SYS_COUNTER_CNTRL) & SYS_CNTRL_T1S);
-                /* RTC now ticks at 32.768/16 kHz */
-                au_writel(trim_divide - 1, SYS_RTCTRIM);
-                while (au_readl(SYS_COUNTER_CNTRL) & SYS_CNTRL_T1S);
-
-                while (au_readl(SYS_COUNTER_CNTRL) & SYS_CNTRL_C1S);
-                au_writel(0, SYS_TOYWRITE);
-                while (au_readl(SYS_COUNTER_CNTRL) & SYS_CNTRL_C1S);
-        } else
-                no_au1xxx_32khz = 1;
-
         /*
          * On early Au1000, sys_cpupll was write-only. Since these
          * silicon versions of Au1000 are not sold by AMD, we don't bend
@@ -215,8 +91,65 @@ unsigned long calc_clock(void)
         return cpu_speed;
 }
 
+static cycle_t au1x_counter1_read(void)
+{
+        return au_readl(SYS_RTCREAD);
+}
+
+static struct clocksource au1x_counter1_clocksource = {
+        .name           = "alchemy-counter1",
+        .read           = au1x_counter1_read,
+        .mask           = CLOCKSOURCE_MASK(32),
+        .flags          = CLOCK_SOURCE_IS_CONTINUOUS,
+        .rating         = 100,
+};
+
+static int au1x_rtcmatch2_set_next_event(unsigned long delta,
+                                         struct clock_event_device *cd)
+{
+        delta += au_readl(SYS_RTCREAD);
+        /* wait for register access */
+        while (au_readl(SYS_COUNTER_CNTRL) & SYS_CNTRL_M21)
+                ;
+        au_writel(delta, SYS_RTCMATCH2);
+        au_sync();
+
+        return 0;
+}
+
+static void au1x_rtcmatch2_set_mode(enum clock_event_mode mode,
+                                    struct clock_event_device *cd)
+{
+}
+
+static irqreturn_t au1x_rtcmatch2_irq(int irq, void *dev_id)
+{
+        struct clock_event_device *cd = dev_id;
+        cd->event_handler(cd);
+        return IRQ_HANDLED;
+}
+
+static struct clock_event_device au1x_rtcmatch2_clockdev = {
+        .name           = "rtcmatch2",
+        .features       = CLOCK_EVT_FEAT_ONESHOT,
+        .rating         = 100,
+        .irq            = AU1000_RTC_MATCH2_INT,
+        .set_next_event = au1x_rtcmatch2_set_next_event,
+        .set_mode       = au1x_rtcmatch2_set_mode,
+        .cpumask        = CPU_MASK_ALL,
+};
+
+static struct irqaction au1x_rtcmatch2_irqaction = {
+        .handler        = au1x_rtcmatch2_irq,
+        .flags          = IRQF_DISABLED | IRQF_TIMER,
+        .name           = "timer",
+        .dev_id         = &au1x_rtcmatch2_clockdev,
+};
+
 void __init plat_time_init(void)
 {
+        struct clock_event_device *cd = &au1x_rtcmatch2_clockdev;
+        unsigned long t;
         unsigned int est_freq = calc_clock();
 
         est_freq += 5000;    /* round */
@@ -225,41 +158,62 @@ void __init plat_time_init(void)
                est_freq / 1000000, ((est_freq % 1000000) * 100) / 1000000);
         set_au1x00_speed(est_freq);
 
-#ifdef CONFIG_PM
-        /*
-         * setup counter 0, since it keeps ticking after a
-         * 'wait' instruction has been executed. The CP0 timer and
-         * counter 1 do NOT continue running after 'wait'
-         *
-         * It's too early to call request_irq() here, so we handle
-         * counter 0 interrupt as a special irq and it doesn't show
-         * up under /proc/interrupts.
-         *
-         * Check to ensure we really have a 32 KHz oscillator before
-         * we do this.
+        /* Check if firmware (YAMON, ...) has enabled 32kHz and clock
+         * has been detected.  If so install the rtcmatch2 clocksource,
+         * otherwise don't bother.  Note that both bits being set is by
+         * no means a definite guarantee that the counters actually work
+         * (the 32S bit seems to be stuck set to 1 once a single clock-
+         * edge is detected, hence the timeouts).
          */
-        if (no_au1xxx_32khz)
-                printk(KERN_WARNING "WARNING: no 32KHz clock found.\n");
-        else {
-                while (au_readl(SYS_COUNTER_CNTRL) & SYS_CNTRL_C0S);
-                au_writel(0, SYS_TOYWRITE);
-                while (au_readl(SYS_COUNTER_CNTRL) & SYS_CNTRL_C0S);
+        if (CNTR_OK != (au_readl(SYS_COUNTER_CNTRL) & CNTR_OK))
+                goto cntr_err;
 
-                au_writel(au_readl(SYS_WAKEMSK) | (1 << 8), SYS_WAKEMSK);
-                au_writel(~0, SYS_WAKESRC);
-                au_sync();
-                while (au_readl(SYS_COUNTER_CNTRL) & SYS_CNTRL_M20);
+        /*
+         * setup counter 1 (RTC) to tick at full speed
+         */
+        t = 0xffffff;
+        while ((au_readl(SYS_COUNTER_CNTRL) & SYS_CNTRL_T1S) && t--)
+                asm volatile ("nop");
+        if (!t)
+                goto cntr_err;
 
-                /* Setup match20 to interrupt once every HZ */
-                last_pc0 = last_match20 = au_readl(SYS_TOYREAD);
-                au_writel(last_match20 + MATCH20_INC, SYS_TOYMATCH2);
-                au_sync();
-                while (au_readl(SYS_COUNTER_CNTRL) & SYS_CNTRL_M20);
-                setup_irq(AU1000_TOY_MATCH2_INT, &counter0_action);
+        au_writel(0, SYS_RTCTRIM);      /* 32.768 kHz */
+        au_sync();
 
-                /* We can use the real 'wait' instruction. */
-                allow_au1k_wait = 1;
-        }
+        t = 0xffffff;
+        while ((au_readl(SYS_COUNTER_CNTRL) & SYS_CNTRL_C1S) && t--)
+                asm volatile ("nop");
+        if (!t)
+                goto cntr_err;
+        au_writel(0, SYS_RTCWRITE);
+        au_sync();
 
-#endif
+        t = 0xffffff;
+        while ((au_readl(SYS_COUNTER_CNTRL) & SYS_CNTRL_C1S) && t--)
+                asm volatile ("nop");
+        if (!t)
+                goto cntr_err;
+
+        /* register counter1 clocksource and event device */
+        clocksource_set_clock(&au1x_counter1_clocksource, 32768);
+        clocksource_register(&au1x_counter1_clocksource);
+
+        cd->shift = 32;
+        cd->mult = div_sc(32768, NSEC_PER_SEC, cd->shift);
+        cd->max_delta_ns = clockevent_delta2ns(0xffffffff, cd);
+        cd->min_delta_ns = clockevent_delta2ns(8, cd);  /* ~0.25ms */
+        clockevents_register_device(cd);
+        setup_irq(AU1000_RTC_MATCH2_INT, &au1x_rtcmatch2_irqaction);
+
+        printk(KERN_INFO "Alchemy clocksource installed\n");
+
+        /* can now use 'wait' */
+        allow_au1k_wait = 1;
+        return;
+
+cntr_err:
+        /* counters unusable, use C0 counter */
+        r4k_clockevent_init();
+        init_r4k_clocksource();
+        allow_au1k_wait = 0;
 }