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Diffstat (limited to 'arch/arm/mach-gemini/time.c')
| -rw-r--r-- | arch/arm/mach-gemini/time.c | 239 |
1 files changed, 0 insertions, 239 deletions
diff --git a/arch/arm/mach-gemini/time.c b/arch/arm/mach-gemini/time.c deleted file mode 100644 index f5f18df5aacd..000000000000 --- a/arch/arm/mach-gemini/time.c +++ /dev/null @@ -1,239 +0,0 @@ -/* - * Copyright (C) 2001-2006 Storlink, Corp. - * Copyright (C) 2008-2009 Paulius Zaleckas <paulius.zaleckas@teltonika.lt> - * - * 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. - */ -#include <linux/interrupt.h> -#include <linux/irq.h> -#include <linux/io.h> -#include <mach/hardware.h> -#include <mach/global_reg.h> -#include <asm/mach/time.h> -#include <linux/clockchips.h> -#include <linux/clocksource.h> -#include <linux/sched_clock.h> - -/* - * Register definitions for the timers - */ - -#define TIMER1_BASE GEMINI_TIMER_BASE -#define TIMER2_BASE (GEMINI_TIMER_BASE + 0x10) -#define TIMER3_BASE (GEMINI_TIMER_BASE + 0x20) - -#define TIMER_COUNT(BASE) (IO_ADDRESS(BASE) + 0x00) -#define TIMER_LOAD(BASE) (IO_ADDRESS(BASE) + 0x04) -#define TIMER_MATCH1(BASE) (IO_ADDRESS(BASE) + 0x08) -#define TIMER_MATCH2(BASE) (IO_ADDRESS(BASE) + 0x0C) -#define TIMER_CR (IO_ADDRESS(GEMINI_TIMER_BASE) + 0x30) -#define TIMER_INTR_STATE (IO_ADDRESS(GEMINI_TIMER_BASE) + 0x34) -#define TIMER_INTR_MASK (IO_ADDRESS(GEMINI_TIMER_BASE) + 0x38) - -#define TIMER_1_CR_ENABLE (1 << 0) -#define TIMER_1_CR_CLOCK (1 << 1) -#define TIMER_1_CR_INT (1 << 2) -#define TIMER_2_CR_ENABLE (1 << 3) -#define TIMER_2_CR_CLOCK (1 << 4) -#define TIMER_2_CR_INT (1 << 5) -#define TIMER_3_CR_ENABLE (1 << 6) -#define TIMER_3_CR_CLOCK (1 << 7) -#define TIMER_3_CR_INT (1 << 8) -#define TIMER_1_CR_UPDOWN (1 << 9) -#define TIMER_2_CR_UPDOWN (1 << 10) -#define TIMER_3_CR_UPDOWN (1 << 11) -#define TIMER_DEFAULT_FLAGS (TIMER_1_CR_UPDOWN | \ - TIMER_3_CR_ENABLE | \ - TIMER_3_CR_UPDOWN) - -#define TIMER_1_INT_MATCH1 (1 << 0) -#define TIMER_1_INT_MATCH2 (1 << 1) -#define TIMER_1_INT_OVERFLOW (1 << 2) -#define TIMER_2_INT_MATCH1 (1 << 3) -#define TIMER_2_INT_MATCH2 (1 << 4) -#define TIMER_2_INT_OVERFLOW (1 << 5) -#define TIMER_3_INT_MATCH1 (1 << 6) -#define TIMER_3_INT_MATCH2 (1 << 7) -#define TIMER_3_INT_OVERFLOW (1 << 8) -#define TIMER_INT_ALL_MASK 0x1ff - - -static unsigned int tick_rate; - -static u64 notrace gemini_read_sched_clock(void) -{ - return readl(TIMER_COUNT(TIMER3_BASE)); -} - -static int gemini_timer_set_next_event(unsigned long cycles, - struct clock_event_device *evt) -{ - u32 cr; - - /* Setup the match register */ - cr = readl(TIMER_COUNT(TIMER1_BASE)); - writel(cr + cycles, TIMER_MATCH1(TIMER1_BASE)); - if (readl(TIMER_COUNT(TIMER1_BASE)) - cr > cycles) - return -ETIME; - - return 0; -} - -static int gemini_timer_shutdown(struct clock_event_device *evt) -{ - u32 cr; - - /* - * Disable also for oneshot: the set_next() call will arm the timer - * instead. - */ - /* Stop timer and interrupt. */ - cr = readl(TIMER_CR); - cr &= ~(TIMER_1_CR_ENABLE | TIMER_1_CR_INT); - writel(cr, TIMER_CR); - - /* Setup counter start from 0 */ - writel(0, TIMER_COUNT(TIMER1_BASE)); - writel(0, TIMER_LOAD(TIMER1_BASE)); - - /* enable interrupt */ - cr = readl(TIMER_INTR_MASK); - cr &= ~(TIMER_1_INT_OVERFLOW | TIMER_1_INT_MATCH2); - cr |= TIMER_1_INT_MATCH1; - writel(cr, TIMER_INTR_MASK); - - /* start the timer */ - cr = readl(TIMER_CR); - cr |= TIMER_1_CR_ENABLE; - writel(cr, TIMER_CR); - - return 0; -} - -static int gemini_timer_set_periodic(struct clock_event_device *evt) -{ - u32 period = DIV_ROUND_CLOSEST(tick_rate, HZ); - u32 cr; - - /* Stop timer and interrupt */ - cr = readl(TIMER_CR); - cr &= ~(TIMER_1_CR_ENABLE | TIMER_1_CR_INT); - writel(cr, TIMER_CR); - - /* Setup timer to fire at 1/HT intervals. */ - cr = 0xffffffff - (period - 1); - writel(cr, TIMER_COUNT(TIMER1_BASE)); - writel(cr, TIMER_LOAD(TIMER1_BASE)); - - /* enable interrupt on overflow */ - cr = readl(TIMER_INTR_MASK); - cr &= ~(TIMER_1_INT_MATCH1 | TIMER_1_INT_MATCH2); - cr |= TIMER_1_INT_OVERFLOW; - writel(cr, TIMER_INTR_MASK); - - /* Start the timer */ - cr = readl(TIMER_CR); - cr |= TIMER_1_CR_ENABLE; - cr |= TIMER_1_CR_INT; - writel(cr, TIMER_CR); - - return 0; -} - -/* Use TIMER1 as clock event */ -static struct clock_event_device gemini_clockevent = { - .name = "TIMER1", - /* Reasonably fast and accurate clock event */ - .rating = 300, - .shift = 32, - .features = CLOCK_EVT_FEAT_PERIODIC | - CLOCK_EVT_FEAT_ONESHOT, - .set_next_event = gemini_timer_set_next_event, - .set_state_shutdown = gemini_timer_shutdown, - .set_state_periodic = gemini_timer_set_periodic, - .set_state_oneshot = gemini_timer_shutdown, - .tick_resume = gemini_timer_shutdown, -}; - -/* - * IRQ handler for the timer - */ -static irqreturn_t gemini_timer_interrupt(int irq, void *dev_id) -{ - struct clock_event_device *evt = &gemini_clockevent; - - evt->event_handler(evt); - return IRQ_HANDLED; -} - -static struct irqaction gemini_timer_irq = { - .name = "Gemini Timer Tick", - .flags = IRQF_TIMER, - .handler = gemini_timer_interrupt, -}; - -/* - * Set up timer interrupt, and return the current time in seconds. - */ -void __init gemini_timer_init(void) -{ - u32 reg_v; - - reg_v = readl(IO_ADDRESS(GEMINI_GLOBAL_BASE + GLOBAL_STATUS)); - tick_rate = REG_TO_AHB_SPEED(reg_v) * 1000000; - - printk(KERN_INFO "Bus: %dMHz", tick_rate / 1000000); - - tick_rate /= 6; /* APB bus run AHB*(1/6) */ - - switch(reg_v & CPU_AHB_RATIO_MASK) { - case CPU_AHB_1_1: - printk(KERN_CONT "(1/1)\n"); - break; - case CPU_AHB_3_2: - printk(KERN_CONT "(3/2)\n"); - break; - case CPU_AHB_24_13: - printk(KERN_CONT "(24/13)\n"); - break; - case CPU_AHB_2_1: - printk(KERN_CONT "(2/1)\n"); - break; - } - - /* - * Reset the interrupt mask and status - */ - writel(TIMER_INT_ALL_MASK, TIMER_INTR_MASK); - writel(0, TIMER_INTR_STATE); - writel(TIMER_DEFAULT_FLAGS, TIMER_CR); - - /* - * Setup free-running clocksource timer (interrupts - * disabled.) - */ - writel(0, TIMER_COUNT(TIMER3_BASE)); - writel(0, TIMER_LOAD(TIMER3_BASE)); - writel(0, TIMER_MATCH1(TIMER3_BASE)); - writel(0, TIMER_MATCH2(TIMER3_BASE)); - clocksource_mmio_init(TIMER_COUNT(TIMER3_BASE), - "gemini_clocksource", tick_rate, - 300, 32, clocksource_mmio_readl_up); - sched_clock_register(gemini_read_sched_clock, 32, tick_rate); - - /* - * Setup clockevent timer (interrupt-driven.) - */ - writel(0, TIMER_COUNT(TIMER1_BASE)); - writel(0, TIMER_LOAD(TIMER1_BASE)); - writel(0, TIMER_MATCH1(TIMER1_BASE)); - writel(0, TIMER_MATCH2(TIMER1_BASE)); - setup_irq(IRQ_TIMER1, &gemini_timer_irq); - gemini_clockevent.cpumask = cpumask_of(0); - clockevents_config_and_register(&gemini_clockevent, tick_rate, - 1, 0xffffffff); - -} |