diff options
Diffstat (limited to 'arch/arm/mach-vt8500/timer.c')
| -rw-r--r-- | arch/arm/mach-vt8500/timer.c | 67 |
1 files changed, 48 insertions, 19 deletions
diff --git a/arch/arm/mach-vt8500/timer.c b/arch/arm/mach-vt8500/timer.c index d5376c592ab6..050e1833f2d0 100644 --- a/arch/arm/mach-vt8500/timer.c +++ b/arch/arm/mach-vt8500/timer.c @@ -1,6 +1,7 @@ /* - * arch/arm/mach-vt8500/timer.c + * arch/arm/mach-vt8500/timer_dt.c * + * Copyright (C) 2012 Tony Prisk <linux@prisktech.co.nz> * Copyright (C) 2010 Alexey Charkov <alchark@gmail.com> * * This program is free software; you can redistribute it and/or modify @@ -18,18 +19,25 @@ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ +/* + * This file is copied and modified from the original timer.c provided by + * Alexey Charkov. Minor changes have been made for Device Tree Support. + */ + #include <linux/io.h> #include <linux/irq.h> #include <linux/interrupt.h> #include <linux/clocksource.h> #include <linux/clockchips.h> #include <linux/delay.h> - #include <asm/mach/time.h> -#include "devices.h" +#include <linux/of.h> +#include <linux/of_address.h> +#include <linux/of_irq.h> #define VT8500_TIMER_OFFSET 0x0100 +#define VT8500_TIMER_HZ 3000000 #define TIMER_MATCH_VAL 0x0000 #define TIMER_COUNT_VAL 0x0010 #define TIMER_STATUS_VAL 0x0014 @@ -39,7 +47,6 @@ #define TIMER_COUNT_R_ACTIVE (1 << 5) /* not ready for read */ #define TIMER_COUNT_W_ACTIVE (1 << 4) /* not ready for write */ #define TIMER_MATCH_W_ACTIVE (1 << 0) /* not ready for write */ -#define VT8500_TIMER_HZ 3000000 #define msecs_to_loops(t) (loops_per_jiffy / 1000 * HZ * t) @@ -55,7 +62,7 @@ static cycle_t vt8500_timer_read(struct clocksource *cs) return readl(regbase + TIMER_COUNT_VAL); } -struct clocksource clocksource = { +static struct clocksource clocksource = { .name = "vt8500_timer", .rating = 200, .read = vt8500_timer_read, @@ -98,7 +105,7 @@ static void vt8500_timer_set_mode(enum clock_event_mode mode, } } -struct clock_event_device clockevent = { +static struct clock_event_device clockevent = { .name = "vt8500_timer", .features = CLOCK_EVT_FEAT_ONESHOT, .rating = 200, @@ -115,26 +122,51 @@ static irqreturn_t vt8500_timer_interrupt(int irq, void *dev_id) return IRQ_HANDLED; } -struct irqaction irq = { +static struct irqaction irq = { .name = "vt8500_timer", .flags = IRQF_DISABLED | IRQF_TIMER | IRQF_IRQPOLL, .handler = vt8500_timer_interrupt, .dev_id = &clockevent, }; -static void __init vt8500_timer_init(void) +static struct of_device_id vt8500_timer_ids[] = { + { .compatible = "via,vt8500-timer" }, + { } +}; + +void __init vt8500_timer_init(void) { - regbase = ioremap(wmt_pmc_base + VT8500_TIMER_OFFSET, 0x28); - if (!regbase) - printk(KERN_ERR "vt8500_timer_init: failed to map MMIO registers\n"); + struct device_node *np; + int timer_irq; + + np = of_find_matching_node(NULL, vt8500_timer_ids); + if (!np) { + pr_err("%s: Timer description missing from Device Tree\n", + __func__); + return; + } + regbase = of_iomap(np, 0); + if (!regbase) { + pr_err("%s: Missing iobase description in Device Tree\n", + __func__); + of_node_put(np); + return; + } + timer_irq = irq_of_parse_and_map(np, 0); + if (!timer_irq) { + pr_err("%s: Missing irq description in Device Tree\n", + __func__); + of_node_put(np); + return; + } writel(1, regbase + TIMER_CTRL_VAL); writel(0xf, regbase + TIMER_STATUS_VAL); writel(~0, regbase + TIMER_MATCH_VAL); if (clocksource_register_hz(&clocksource, VT8500_TIMER_HZ)) - printk(KERN_ERR "vt8500_timer_init: clocksource_register failed for %s\n", - clocksource.name); + pr_err("%s: vt8500_timer_init: clocksource_register failed for %s\n", + __func__, clocksource.name); clockevents_calc_mult_shift(&clockevent, VT8500_TIMER_HZ, 4); @@ -144,12 +176,9 @@ static void __init vt8500_timer_init(void) clockevent.min_delta_ns = clockevent_delta2ns(4, &clockevent); clockevent.cpumask = cpumask_of(0); - if (setup_irq(wmt_timer_irq, &irq)) - printk(KERN_ERR "vt8500_timer_init: setup_irq failed for %s\n", - clockevent.name); + if (setup_irq(timer_irq, &irq)) + pr_err("%s: setup_irq failed for %s\n", __func__, + clockevent.name); clockevents_register_device(&clockevent); } -struct sys_timer vt8500_timer = { - .init = vt8500_timer_init -}; |