diff options
author | Lars-Peter Clausen <lars@metafoo.de> | 2010-06-19 04:08:09 (GMT) |
---|---|---|
committer | Ralf Baechle <ralf@linux-mips.org> | 2010-08-05 12:26:13 (GMT) |
commit | 544a7324198972716d486e04e77bc2622e12245b (patch) | |
tree | 486c239bf899218fcd351c47240ebfbc05eb5f14 /arch | |
parent | 9869848d12601cdddf097a36aebe0b10dc5d177b (diff) | |
download | linux-544a7324198972716d486e04e77bc2622e12245b.tar.xz |
MIPS: JZ4740: Add timer support
Add support for the timer/counter unit on a JZ4740 SoC. This code is used
as a common base for the JZ4740 clocksource/clockevent implementation and
PWM support.
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/1396/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch')
-rw-r--r-- | arch/mips/include/asm/mach-jz4740/timer.h | 22 | ||||
-rw-r--r-- | arch/mips/jz4740/timer.c | 48 | ||||
-rw-r--r-- | arch/mips/jz4740/timer.h | 136 |
3 files changed, 206 insertions, 0 deletions
diff --git a/arch/mips/include/asm/mach-jz4740/timer.h b/arch/mips/include/asm/mach-jz4740/timer.h new file mode 100644 index 0000000..9baa03c --- /dev/null +++ b/arch/mips/include/asm/mach-jz4740/timer.h @@ -0,0 +1,22 @@ +/* + * Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de> + * JZ4740 platform timer support + * + * 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. + * + * 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., + * 675 Mass Ave, Cambridge, MA 02139, USA. + * + */ + +#ifndef __ASM_MACH_JZ4740_TIMER +#define __ASM_MACH_JZ4740_TIMER + +void jz4740_timer_enable_watchdog(void); +void jz4740_timer_disable_watchdog(void); + +#endif diff --git a/arch/mips/jz4740/timer.c b/arch/mips/jz4740/timer.c new file mode 100644 index 0000000..b2c0151 --- /dev/null +++ b/arch/mips/jz4740/timer.c @@ -0,0 +1,48 @@ +/* + * Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de> + * JZ4740 platform timer support + * + * 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. + * + * 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., + * 675 Mass Ave, Cambridge, MA 02139, USA. + * + */ + +#include <linux/io.h> +#include <linux/kernel.h> +#include <linux/module.h> + +#include "timer.h" + +#include <asm/mach-jz4740/base.h> + +void __iomem *jz4740_timer_base; + +void jz4740_timer_enable_watchdog(void) +{ + writel(BIT(16), jz4740_timer_base + JZ_REG_TIMER_STOP_CLEAR); +} + +void jz4740_timer_disable_watchdog(void) +{ + writel(BIT(16), jz4740_timer_base + JZ_REG_TIMER_STOP_SET); +} + +void __init jz4740_timer_init(void) +{ + jz4740_timer_base = ioremap(JZ4740_TCU_BASE_ADDR, 0x100); + + if (!jz4740_timer_base) + panic("Failed to ioremap timer registers"); + + /* Disable all timer clocks except for those used as system timers */ + writel(0x000100fc, jz4740_timer_base + JZ_REG_TIMER_STOP_SET); + + /* Timer irqs are unmasked by default, mask them */ + writel(0x00ff00ff, jz4740_timer_base + JZ_REG_TIMER_MASK_SET); +} diff --git a/arch/mips/jz4740/timer.h b/arch/mips/jz4740/timer.h new file mode 100644 index 0000000..fca3994 --- /dev/null +++ b/arch/mips/jz4740/timer.h @@ -0,0 +1,136 @@ +/* + * Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de> + * JZ4740 platform timer support + * + * 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. + * + * 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., + * 675 Mass Ave, Cambridge, MA 02139, USA. + * + */ + +#ifndef __MIPS_JZ4740_TIMER_H__ +#define __MIPS_JZ4740_TIMER_H__ + +#include <linux/module.h> +#include <linux/io.h> + +#define JZ_REG_TIMER_STOP 0x0C +#define JZ_REG_TIMER_STOP_SET 0x1C +#define JZ_REG_TIMER_STOP_CLEAR 0x2C +#define JZ_REG_TIMER_ENABLE 0x00 +#define JZ_REG_TIMER_ENABLE_SET 0x04 +#define JZ_REG_TIMER_ENABLE_CLEAR 0x08 +#define JZ_REG_TIMER_FLAG 0x10 +#define JZ_REG_TIMER_FLAG_SET 0x14 +#define JZ_REG_TIMER_FLAG_CLEAR 0x18 +#define JZ_REG_TIMER_MASK 0x20 +#define JZ_REG_TIMER_MASK_SET 0x24 +#define JZ_REG_TIMER_MASK_CLEAR 0x28 + +#define JZ_REG_TIMER_DFR(x) (((x) * 0x10) + 0x30) +#define JZ_REG_TIMER_DHR(x) (((x) * 0x10) + 0x34) +#define JZ_REG_TIMER_CNT(x) (((x) * 0x10) + 0x38) +#define JZ_REG_TIMER_CTRL(x) (((x) * 0x10) + 0x3C) + +#define JZ_TIMER_IRQ_HALF(x) BIT((x) + 0x10) +#define JZ_TIMER_IRQ_FULL(x) BIT(x) + +#define JZ_TIMER_CTRL_PWM_ABBRUPT_SHUTDOWN BIT(9) +#define JZ_TIMER_CTRL_PWM_ACTIVE_LOW BIT(8) +#define JZ_TIMER_CTRL_PWM_ENABLE BIT(7) +#define JZ_TIMER_CTRL_PRESCALE_MASK 0x1c +#define JZ_TIMER_CTRL_PRESCALE_OFFSET 0x3 +#define JZ_TIMER_CTRL_PRESCALE_1 (0 << 3) +#define JZ_TIMER_CTRL_PRESCALE_4 (1 << 3) +#define JZ_TIMER_CTRL_PRESCALE_16 (2 << 3) +#define JZ_TIMER_CTRL_PRESCALE_64 (3 << 3) +#define JZ_TIMER_CTRL_PRESCALE_256 (4 << 3) +#define JZ_TIMER_CTRL_PRESCALE_1024 (5 << 3) + +#define JZ_TIMER_CTRL_PRESCALER(x) ((x) << JZ_TIMER_CTRL_PRESCALE_OFFSET) + +#define JZ_TIMER_CTRL_SRC_EXT BIT(2) +#define JZ_TIMER_CTRL_SRC_RTC BIT(1) +#define JZ_TIMER_CTRL_SRC_PCLK BIT(0) + +extern void __iomem *jz4740_timer_base; +void __init jz4740_timer_init(void); + +static inline void jz4740_timer_stop(unsigned int timer) +{ + writel(BIT(timer), jz4740_timer_base + JZ_REG_TIMER_STOP_SET); +} + +static inline void jz4740_timer_start(unsigned int timer) +{ + writel(BIT(timer), jz4740_timer_base + JZ_REG_TIMER_STOP_CLEAR); +} + +static inline bool jz4740_timer_is_enabled(unsigned int timer) +{ + return readb(jz4740_timer_base + JZ_REG_TIMER_ENABLE) & BIT(timer); +} + +static inline void jz4740_timer_enable(unsigned int timer) +{ + writeb(BIT(timer), jz4740_timer_base + JZ_REG_TIMER_ENABLE_SET); +} + +static inline void jz4740_timer_disable(unsigned int timer) +{ + writeb(BIT(timer), jz4740_timer_base + JZ_REG_TIMER_ENABLE_CLEAR); +} + + +static inline void jz4740_timer_set_period(unsigned int timer, uint16_t period) +{ + writew(period, jz4740_timer_base + JZ_REG_TIMER_DFR(timer)); +} + +static inline void jz4740_timer_set_duty(unsigned int timer, uint16_t duty) +{ + writew(duty, jz4740_timer_base + JZ_REG_TIMER_DHR(timer)); +} + +static inline void jz4740_timer_set_count(unsigned int timer, uint16_t count) +{ + writew(count, jz4740_timer_base + JZ_REG_TIMER_CNT(timer)); +} + +static inline uint16_t jz4740_timer_get_count(unsigned int timer) +{ + return readw(jz4740_timer_base + JZ_REG_TIMER_CNT(timer)); +} + +static inline void jz4740_timer_ack_full(unsigned int timer) +{ + writel(JZ_TIMER_IRQ_FULL(timer), jz4740_timer_base + JZ_REG_TIMER_FLAG_CLEAR); +} + +static inline void jz4740_timer_irq_full_enable(unsigned int timer) +{ + writel(JZ_TIMER_IRQ_FULL(timer), jz4740_timer_base + JZ_REG_TIMER_FLAG_CLEAR); + writel(JZ_TIMER_IRQ_FULL(timer), jz4740_timer_base + JZ_REG_TIMER_MASK_CLEAR); +} + +static inline void jz4740_timer_irq_full_disable(unsigned int timer) +{ + writel(JZ_TIMER_IRQ_FULL(timer), jz4740_timer_base + JZ_REG_TIMER_MASK_SET); +} + +static inline void jz4740_timer_set_ctrl(unsigned int timer, uint16_t ctrl) +{ + writew(ctrl, jz4740_timer_base + JZ_REG_TIMER_CTRL(timer)); +} + +static inline uint16_t jz4740_timer_get_ctrl(unsigned int timer) +{ + return readw(jz4740_timer_base + JZ_REG_TIMER_CTRL(timer)); +} + +#endif |