add DECstation DS1287 clockevent
Signed-off-by: Yoichi Yuasa <yoichi_yuasa@xxxxxxxxxxxxxx>
diff -pruN -X /home/yuasa/Memo/dontdiff linux-orig/arch/mips/Kconfig linux/arch/mips/Kconfig
--- linux-orig/arch/mips/Kconfig 2008-04-22 19:01:43.957134178 +0900
+++ linux/arch/mips/Kconfig 2008-04-22 18:03:05.427649422 +0900
@@ -81,6 +81,7 @@ config MIPS_COBALT
config MACH_DECSTATION
bool "DECstations"
select BOOT_ELF32
+ select CEVT_DS1287
select CEVT_R4K
select CSRC_IOASIC
select CSRC_R4K
@@ -769,6 +770,9 @@ config BOOT_RAW
config CEVT_BCM1480
bool
+config CEVT_DS1287
+ bool
+
config CEVT_GT641XX
bool
diff -pruN -X /home/yuasa/Memo/dontdiff linux-orig/arch/mips/dec/time.c linux/arch/mips/dec/time.c
--- linux-orig/arch/mips/dec/time.c 2008-04-22 19:01:43.957134178 +0900
+++ linux/arch/mips/dec/time.c 2008-04-22 18:03:05.427649422 +0900
@@ -9,30 +9,16 @@
*
*/
#include <linux/bcd.h>
-#include <linux/errno.h>
#include <linux/init.h>
-#include <linux/interrupt.h>
-#include <linux/kernel.h>
#include <linux/mc146818rtc.h>
-#include <linux/mm.h>
-#include <linux/module.h>
#include <linux/param.h>
-#include <linux/sched.h>
-#include <linux/string.h>
-#include <linux/time.h>
-#include <linux/types.h>
-
-#include <asm/bootinfo.h>
-#include <asm/cpu.h>
-#include <asm/io.h>
-#include <asm/irq.h>
-#include <asm/mipsregs.h>
-#include <asm/sections.h>
+
+#include <asm/cpu-features.h>
#include <asm/time.h>
+#include <asm/dec/ds1287.h>
#include <asm/dec/interrupts.h>
#include <asm/dec/ioasic.h>
-#include <asm/dec/ioasic_addrs.h>
#include <asm/dec/machtype.h>
unsigned long read_persistent_clock(void)
@@ -139,42 +125,32 @@ int rtc_mips_set_mmss(unsigned long nowt
return retval;
}
-static int dec_timer_state(void)
+void __init plat_time_init(void)
{
- return (CMOS_READ(RTC_REG_C) & RTC_PF) != 0;
-}
+ u32 start, end;
+ int i = HZ / 10;
-static void dec_timer_ack(void)
-{
- CMOS_READ(RTC_REG_C); /* Ack the RTC interrupt. */
-}
+ /* Set up the rate of periodic DS1287 interrupts. */
+ ds1287_set_base_clock(HZ);
-static cycle_t dec_ioasic_hpt_read(void)
-{
- /*
- * The free-running counter is 32-bit which is good for about
- * 2 minutes, 50 seconds at possible count rates of up to 25MHz.
- */
- return ioasic_read(IO_REG_FCTR);
-}
+ if (cpu_has_counter) {
+ while (!ds1287_timer_state())
+ ;
+ start = read_c0_count();
-void __init plat_time_init(void)
-{
- mips_timer_ack = dec_timer_ack;
+ while (i--)
+ while (!ds1287_timer_state())
+ ;
+
+ end = read_c0_count();
- if (!cpu_has_counter && IOASIC)
+ mips_hpt_frequency = (end - start) * 10;
+ printk(KERN_INFO "MIPS counter frequency %dHz\n",
+ mips_hpt_frequency);
+ } else if (IOASIC)
/* For pre-R4k systems we use the I/O ASIC's counter. */
dec_ioasic_clocksource_init();
- /* Set up the rate of periodic DS1287 interrupts. */
- CMOS_WRITE(RTC_REF_CLCK_32KHZ | (16 - __ffs(HZ)), RTC_REG_A);
-}
-
-void __init plat_timer_setup(struct irqaction *irq)
-{
- setup_irq(dec_interrupt[DEC_IRQ_RTC], irq);
-
- /* Enable periodic DS1287 interrupts. */
- CMOS_WRITE(CMOS_READ(RTC_REG_B) | RTC_PIE, RTC_REG_B);
+ ds1287_clockevent_init(dec_interrupt[DEC_IRQ_RTC]);
}
diff -pruN -X /home/yuasa/Memo/dontdiff linux-orig/arch/mips/kernel/Makefile linux/arch/mips/kernel/Makefile
--- linux-orig/arch/mips/kernel/Makefile 2008-04-22 19:01:43.957134178 +0900
+++ linux/arch/mips/kernel/Makefile 2008-04-22 18:03:05.427649422 +0900
@@ -9,8 +9,9 @@ obj-y += cpu-probe.o branch.o entry.o g
time.o topology.o traps.o unaligned.o
obj-$(CONFIG_CEVT_BCM1480) += cevt-bcm1480.o
-obj-$(CONFIG_CEVT_R4K) += cevt-r4k.o
+obj-$(CONFIG_CEVT_DS1287) += cevt-ds1287.o
obj-$(CONFIG_CEVT_GT641XX) += cevt-gt641xx.o
+obj-$(CONFIG_CEVT_R4K) += cevt-r4k.o
obj-$(CONFIG_CEVT_SB1250) += cevt-sb1250.o
obj-$(CONFIG_CEVT_TXX9) += cevt-txx9.o
obj-$(CONFIG_CSRC_BCM1480) += csrc-bcm1480.o
diff -pruN -X /home/yuasa/Memo/dontdiff linux-orig/arch/mips/kernel/cevt-ds1287.c linux/arch/mips/kernel/cevt-ds1287.c
--- linux-orig/arch/mips/kernel/cevt-ds1287.c 1970-01-01 09:00:00.000000000 +0900
+++ linux/arch/mips/kernel/cevt-ds1287.c 2008-04-22 18:03:05.455637018 +0900
@@ -0,0 +1,132 @@
+/*
+ * DS1287 clockevent driver
+ *
+ * Copyright (C) 2008 Yoichi Yuasa <yoichi_yuasa@xxxxxxxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+#include <linux/clockchips.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/mc146818rtc.h>
+
+#include <asm/time.h>
+
+#include <irq.h>
+
+int ds1287_timer_state(void)
+{
+ return (CMOS_READ(RTC_REG_C) & RTC_PF) != 0;
+}
+
+int ds1287_set_base_clock(unsigned int hz)
+{
+ u8 rate;
+
+ switch (hz) {
+ case 128:
+ rate = 0x9;
+ break;
+ case 256:
+ rate = 0x8;
+ break;
+ case 1024:
+ rate = 0x6;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ CMOS_WRITE(RTC_REF_CLCK_32KHZ | rate, RTC_REG_A);
+
+ return 0;
+}
+
+static int ds1287_set_next_event(unsigned long delta,
+ struct clock_event_device *evt)
+{
+ return -EINVAL;
+}
+
+static void ds1287_set_mode(enum clock_event_mode mode,
+ struct clock_event_device *evt)
+{
+ unsigned long flags;
+ u8 val;
+
+ spin_lock_irqsave(&rtc_lock, flags);
+
+ val = CMOS_READ(RTC_REG_B);
+
+ switch (mode) {
+ case CLOCK_EVT_MODE_PERIODIC:
+ val |= RTC_PIE;
+ break;
+ default:
+ val &= ~RTC_PIE;
+ break;
+ }
+
+ CMOS_WRITE(val, RTC_REG_B);
+
+ spin_unlock_irqrestore(&rtc_lock, flags);
+}
+
+static void ds1287_event_handler(struct clock_event_device *dev)
+{
+}
+
+static struct clock_event_device ds1287_clockevent = {
+ .name = "ds1287",
+ .features = CLOCK_EVT_FEAT_PERIODIC,
+ .cpumask = CPU_MASK_CPU0,
+ .set_next_event = ds1287_set_next_event,
+ .set_mode = ds1287_set_mode,
+ .event_handler = ds1287_event_handler,
+};
+
+static irqreturn_t ds1287_interrupt(int irq, void *dev_id)
+{
+ struct clock_event_device *cd = &ds1287_clockevent;
+
+ /* Ack the RTC interrupt. */
+ CMOS_READ(RTC_REG_C);
+
+ cd->event_handler(cd);
+
+ return IRQ_HANDLED;
+}
+
+static struct irqaction ds1287_irqaction = {
+ .handler = ds1287_interrupt,
+ .flags = IRQF_DISABLED | IRQF_PERCPU,
+ .name = "ds1287",
+};
+
+int __init ds1287_clockevent_init(int irq)
+{
+ struct clock_event_device *cd;
+
+ cd = &ds1287_clockevent;
+ cd->rating = 100;
+ cd->irq = irq;
+ clockevent_set_clock(cd, 32768);
+ cd->max_delta_ns = clockevent_delta2ns(0x7fffffff, cd);
+ cd->min_delta_ns = clockevent_delta2ns(0x300, cd);
+
+ clockevents_register_device(&ds1287_clockevent);
+
+ return setup_irq(irq, &ds1287_irqaction);
+}
diff -pruN -X /home/yuasa/Memo/dontdiff linux-orig/include/asm-mips/dec/ds1287.h linux/include/asm-mips/dec/ds1287.h
--- linux-orig/include/asm-mips/dec/ds1287.h 1970-01-01 09:00:00.000000000 +0900
+++ linux/include/asm-mips/dec/ds1287.h 2008-04-22 18:03:05.455637018 +0900
@@ -0,0 +1,27 @@
+/*
+ * DS1287 timer functions.
+ *
+ * Copyright (C) 2008 Yoichi Yuasa <yoichi_yuasa@xxxxxxxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+#ifndef __ASM_DEC_DS1287_H
+#define __ASM_DEC_DS1287_H
+
+extern int ds1287_timer_state(void);
+extern void ds1287_set_base_clock(unsigned int clock);
+extern int ds1287_clockevent_init(int irq);
+
+#endif
