| /* |
| * arch/arm/mach-netx/time.c |
| * |
| * Copyright (c) 2005 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 |
| * as published by the Free Software Foundation. |
| * |
| * 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| */ |
| |
| #include <linux/init.h> |
| #include <linux/interrupt.h> |
| #include <linux/irq.h> |
| #include <linux/clocksource.h> |
| |
| #include <mach/hardware.h> |
| #include <asm/io.h> |
| #include <asm/mach/time.h> |
| #include <mach/netx-regs.h> |
| |
| /* |
| * IRQ handler for the timer |
| */ |
| static irqreturn_t |
| netx_timer_interrupt(int irq, void *dev_id) |
| { |
| timer_tick(); |
| |
| /* acknowledge interrupt */ |
| writel(COUNTER_BIT(0), NETX_GPIO_IRQ); |
| |
| return IRQ_HANDLED; |
| } |
| |
| static struct irqaction netx_timer_irq = { |
| .name = "NetX Timer Tick", |
| .flags = IRQF_DISABLED | IRQF_TIMER | IRQF_IRQPOLL, |
| .handler = netx_timer_interrupt, |
| }; |
| |
| cycle_t netx_get_cycles(void) |
| { |
| return readl(NETX_GPIO_COUNTER_CURRENT(1)); |
| } |
| |
| static struct clocksource clocksource_netx = { |
| .name = "netx_timer", |
| .rating = 200, |
| .read = netx_get_cycles, |
| .mask = CLOCKSOURCE_MASK(32), |
| .shift = 20, |
| .flags = CLOCK_SOURCE_IS_CONTINUOUS, |
| }; |
| |
| /* |
| * Set up timer interrupt |
| */ |
| static void __init netx_timer_init(void) |
| { |
| /* disable timer initially */ |
| writel(0, NETX_GPIO_COUNTER_CTRL(0)); |
| |
| /* Reset the timer value to zero */ |
| writel(0, NETX_GPIO_COUNTER_CURRENT(0)); |
| |
| writel(LATCH, NETX_GPIO_COUNTER_MAX(0)); |
| |
| /* acknowledge interrupt */ |
| writel(COUNTER_BIT(0), NETX_GPIO_IRQ); |
| |
| /* Enable the interrupt in the specific timer register and start timer */ |
| writel(COUNTER_BIT(0), NETX_GPIO_IRQ_ENABLE); |
| writel(NETX_GPIO_COUNTER_CTRL_IRQ_EN | NETX_GPIO_COUNTER_CTRL_RUN, |
| NETX_GPIO_COUNTER_CTRL(0)); |
| |
| setup_irq(NETX_IRQ_TIMER0, &netx_timer_irq); |
| |
| /* Setup timer one for clocksource */ |
| writel(0, NETX_GPIO_COUNTER_CTRL(1)); |
| writel(0, NETX_GPIO_COUNTER_CURRENT(1)); |
| writel(0xFFFFFFFF, NETX_GPIO_COUNTER_MAX(1)); |
| |
| writel(NETX_GPIO_COUNTER_CTRL_RUN, |
| NETX_GPIO_COUNTER_CTRL(1)); |
| |
| clocksource_netx.mult = |
| clocksource_hz2mult(CLOCK_TICK_RATE, clocksource_netx.shift); |
| clocksource_register(&clocksource_netx); |
| } |
| |
| struct sys_timer netx_timer = { |
| .init = netx_timer_init, |
| }; |