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[MIPS] time: Add GT641xx timer0 clockevent driver

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And make use of it for Cobalt.  A few others such as the Malta could make
use of it as well.

Signed-off-by: Yoichi Yuasa <yoichi_yuasa@tripeaks.co.jp>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Yoichi Yuasa 2007-10-22 19:43:15 +09:00 committed by Ralf Baechle
parent d04533650f
commit 1097c6ac33
7 changed files with 193 additions and 22 deletions
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4
arch/mips/Kconfig
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@ -66,6 +66,7 @@ config BCM47XX
config MIPS_COBALT
bool "Cobalt Server"
select CEVT_R4K
select CEVT_GT641XX
select DMA_NONCOHERENT
select HW_HAS_PCI
select I8253
@ -729,6 +730,9 @@ config ARCH_MAY_HAVE_PC_FDC
config BOOT_RAW
bool
config CEVT_GT641XX
bool
config CEVT_R4K
bool

2
arch/mips/cobalt/Makefile
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@ -2,7 +2,7 @@
# Makefile for the Cobalt micro systems family specific parts of the kernel
#
obj-y := buttons.o irq.o led.o reset.o rtc.o serial.o setup.o
obj-y := buttons.o irq.o led.o reset.o rtc.o serial.o setup.o time.o
obj-$(CONFIG_PCI) += pci.o
obj-$(CONFIG_EARLY_PRINTK) += console.o

24
arch/mips/cobalt/setup.c
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@ -9,19 +9,17 @@
* Copyright (C) 2001, 2002, 2003 by Liam Davies (ldavies@agile.tv)
*
*/
#include <linux/interrupt.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/ioport.h>
#include <linux/pm.h>
#include <asm/bootinfo.h>
#include <asm/time.h>
#include <asm/i8253.h>
#include <asm/io.h>
#include <asm/reboot.h>
#include <asm/gt64120.h>
#include <cobalt.h>
#include <irq.h>
extern void cobalt_machine_restart(char *command);
extern void cobalt_machine_halt(void);
@ -41,17 +39,6 @@ const char *get_system_type(void)
return "MIPS Cobalt";
}
void __init plat_timer_setup(struct irqaction *irq)
{
/* Load timer value for HZ (TCLK is 50MHz) */
GT_WRITE(GT_TC0_OFS, 50*1000*1000 / HZ);
/* Enable timer0 */
GT_WRITE(GT_TC_CONTROL_OFS, GT_TC_CONTROL_ENTC0_MSK | GT_TC_CONTROL_SELTC0_MSK);
setup_irq(GT641XX_TIMER0_IRQ, irq);
}
/*
* Cobalt doesn't have PS/2 keyboard/mouse interfaces,
* keyboard conntroller is never used.
@ -84,11 +71,6 @@ static struct resource cobalt_reserved_resources[] = {
},
};
void __init plat_time_init(void)
{
setup_pit_timer();
}
void __init plat_mem_setup(void)
{
int i;

35
arch/mips/cobalt/time.c Normal file
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@ -0,0 +1,35 @@
/*
* Cobalt time initialization.
*
* Copyright (C) 2007 Yoichi Yuasa <yoichi_yuasa@tripeaks.co.jp>
*
* 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/init.h>
#include <asm/gt64120.h>
#include <asm/i8253.h>
#include <asm/time.h>
#define GT641XX_BASE_CLOCK 50000000 /* 50MHz */
void __init plat_time_init(void)
{
setup_pit_timer();
gt641xx_set_base_clock(GT641XX_BASE_CLOCK);
mips_timer_state = gt641xx_timer0_state;
}

1
arch/mips/kernel/Makefile
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@ -9,6 +9,7 @@ obj-y += cpu-probe.o branch.o entry.o genex.o irq.o process.o \
time.o topology.o traps.o unaligned.o
obj-$(CONFIG_CEVT_R4K) += cevt-r4k.o
obj-$(CONFIG_CEVT_GT641XX) += cevt-gt641xx.o
binfmt_irix-objs := irixelf.o irixinv.o irixioctl.o irixsig.o \
irix5sys.o sysirix.o

144
arch/mips/kernel/cevt-gt641xx.c Normal file
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@ -0,0 +1,144 @@
/*
* GT641xx clockevent routines.
*
* Copyright (C) 2007 Yoichi Yuasa <yoichi_yuasa@tripeaks.co.jp>
*
* 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/spinlock.h>
#include <asm/gt64120.h>
#include <asm/time.h>
#include <irq.h>
static DEFINE_SPINLOCK(gt641xx_timer_lock);
static unsigned int gt641xx_base_clock;
void gt641xx_set_base_clock(unsigned int clock)
{
gt641xx_base_clock = clock;
}
int gt641xx_timer0_state(void)
{
if (GT_READ(GT_TC0_OFS))
return 0;
GT_WRITE(GT_TC0_OFS, gt641xx_base_clock / HZ);
GT_WRITE(GT_TC_CONTROL_OFS, GT_TC_CONTROL_ENTC0_MSK);
return 1;
}
static int gt641xx_timer0_set_next_event(unsigned long delta,
struct clock_event_device *evt)
{
unsigned long flags;
u32 ctrl;
spin_lock_irqsave(&gt641xx_timer_lock, flags);
ctrl = GT_READ(GT_TC_CONTROL_OFS);
ctrl &= ~(GT_TC_CONTROL_ENTC0_MSK | GT_TC_CONTROL_SELTC0_MSK);
ctrl |= GT_TC_CONTROL_ENTC0_MSK;
GT_WRITE(GT_TC0_OFS, delta);
GT_WRITE(GT_TC_CONTROL_OFS, ctrl);
spin_unlock_irqrestore(&gt641xx_timer_lock, flags);
return 0;
}
static void gt641xx_timer0_set_mode(enum clock_event_mode mode,
struct clock_event_device *evt)
{
unsigned long flags;
u32 ctrl;
spin_lock_irqsave(&gt641xx_timer_lock, flags);
ctrl = GT_READ(GT_TC_CONTROL_OFS);
ctrl &= ~(GT_TC_CONTROL_ENTC0_MSK | GT_TC_CONTROL_SELTC0_MSK);
switch (mode) {
case CLOCK_EVT_MODE_PERIODIC:
ctrl |= GT_TC_CONTROL_ENTC0_MSK | GT_TC_CONTROL_SELTC0_MSK;
break;
case CLOCK_EVT_MODE_ONESHOT:
ctrl |= GT_TC_CONTROL_ENTC0_MSK;
break;
default:
break;
}
GT_WRITE(GT_TC_CONTROL_OFS, ctrl);
spin_unlock_irqrestore(&gt641xx_timer_lock, flags);
}
static void gt641xx_timer0_event_handler(struct clock_event_device *dev)
{
}
static struct clock_event_device gt641xx_timer0_clockevent = {
.name = "gt641xx-timer0",
.features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT,
.cpumask = CPU_MASK_CPU0,
.irq = GT641XX_TIMER0_IRQ,
.set_next_event = gt641xx_timer0_set_next_event,
.set_mode = gt641xx_timer0_set_mode,
.event_handler = gt641xx_timer0_event_handler,
};
static irqreturn_t gt641xx_timer0_interrupt(int irq, void *dev_id)
{
struct clock_event_device *cd = &gt641xx_timer0_clockevent;
cd->event_handler(cd);
return IRQ_HANDLED;
}
static struct irqaction gt641xx_timer0_irqaction = {
.handler = gt641xx_timer0_interrupt,
.flags = IRQF_DISABLED | IRQF_PERCPU,
.name = "gt641xx_timer0",
};
static int __init gt641xx_timer0_clockevent_init(void)
{
struct clock_event_device *cd;
if (!gt641xx_base_clock)
return 0;
GT_WRITE(GT_TC0_OFS, gt641xx_base_clock / HZ);
cd = &gt641xx_timer0_clockevent;
cd->rating = 200 + gt641xx_base_clock / 10000000;
cd->max_delta_ns = clockevent_delta2ns(0x7fffffff, cd);
cd->min_delta_ns = clockevent_delta2ns(0x300, cd);
clockevent_set_clock(cd, gt641xx_base_clock);
clockevents_register_device(&gt641xx_timer0_clockevent);
return setup_irq(GT641XX_TIMER0_IRQ, &gt641xx_timer0_irqaction);
}
arch_initcall(gt641xx_timer0_clockevent_init);

5
include/asm-mips/gt64120.h
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@ -21,6 +21,8 @@
#ifndef _ASM_GT64120_H
#define _ASM_GT64120_H
#include <linux/clocksource.h>
#include <asm/addrspace.h>
#include <asm/byteorder.h>
@ -572,4 +574,7 @@
#define GT_READ(ofs) le32_to_cpu(__GT_READ(ofs))
#define GT_WRITE(ofs, data) __GT_WRITE(ofs, cpu_to_le32(data))
extern void gt641xx_set_base_clock(unsigned int clock);
extern int gt641xx_timer0_state(void);
#endif /* _ASM_GT64120_H */