projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| bb6d8c88 SH |
1 | /* |
| 2 | * arch/arm/mach-netx/time.c | |
| 3 | * | |
| 4 | * Copyright (c) 2005 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix | |
| 5 | * | |
| 6 | * This program is free software; you can redistribute it and/or modify | |
| 7 | * it under the terms of the GNU General Public License version 2 | |
| 8 | * as published by the Free Software Foundation. | |
| 9 | * | |
| 10 | * This program is distributed in the hope that it will be useful, | |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 13 | * GNU General Public License for more details. | |
| 14 | * | |
| 15 | * You should have received a copy of the GNU General Public License | |
| 16 | * along with this program; if not, write to the Free Software | |
| 17 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
| 18 | */ | |
| 19 | ||
| 20 | #include <linux/init.h> | |
| 21 | #include <linux/interrupt.h> | |
| 22 | ||
| 23 | #include <asm/hardware.h> | |
| 24 | #include <asm/io.h> | |
| 25 | #include <asm/mach/time.h> | |
| 26 | #include <asm/arch/netx-regs.h> | |
| 27 | ||
| 28 | /* | |
| 29 | * Returns number of us since last clock interrupt. Note that interrupts | |
| 30 | * will have been disabled by do_gettimeoffset() | |
| 31 | */ | |
| 32 | static unsigned long netx_gettimeoffset(void) | |
| 33 | { | |
| 34 | return readl(NETX_GPIO_COUNTER_CURRENT(0)) / 100; | |
| 35 | } | |
| 36 | ||
| 37 | /* | |
| 38 | * IRQ handler for the timer | |
| 39 | */ | |
| 40 | static irqreturn_t | |
| 0cd61b68 | 41 | netx_timer_interrupt(int irq, void *dev_id) |
| bb6d8c88 SH |
42 | { |
| 43 | write_seqlock(&xtime_lock); | |
| 44 | ||
| 0cd61b68 | 45 | timer_tick(); |
| bb6d8c88 SH |
46 | write_sequnlock(&xtime_lock); |
| 47 | ||
| 48 | /* acknowledge interrupt */ | |
| 49 | writel(COUNTER_BIT(0), NETX_GPIO_IRQ); | |
| 50 | ||
| 51 | return IRQ_HANDLED; | |
| 52 | } | |
| 53 | ||
| 54 | ||
| 55 | static struct irqaction netx_timer_irq = { | |
| 56 | .name = "NetX Timer Tick", | |
| 52e405ea | 57 | .flags = IRQF_DISABLED | IRQF_TIMER, |
| bb6d8c88 SH |
58 | .handler = netx_timer_interrupt, |
| 59 | }; | |
| 60 | ||
| 61 | /* | |
| 62 | * Set up timer interrupt | |
| 63 | */ | |
| 64 | static void __init netx_timer_init(void) | |
| 65 | { | |
| 66 | /* disable timer initially */ | |
| 67 | writel(0, NETX_GPIO_COUNTER_CTRL(0)); | |
| 68 | ||
| 69 | /* Reset the timer value to zero */ | |
| 70 | writel(0, NETX_GPIO_COUNTER_CURRENT(0)); | |
| 71 | ||
| 72 | writel(LATCH, NETX_GPIO_COUNTER_MAX(0)); | |
| 73 | ||
| 74 | /* acknowledge interrupt */ | |
| 75 | writel(COUNTER_BIT(0), NETX_GPIO_IRQ); | |
| 76 | ||
| 77 | /* Enable the interrupt in the specific timer register and start timer */ | |
| 78 | writel(COUNTER_BIT(0), NETX_GPIO_IRQ_ENABLE); | |
| 79 | writel(NETX_GPIO_COUNTER_CTRL_IRQ_EN | NETX_GPIO_COUNTER_CTRL_RUN, | |
| 80 | NETX_GPIO_COUNTER_CTRL(0)); | |
| 81 | ||
| 82 | setup_irq(NETX_IRQ_TIMER0, &netx_timer_irq); | |
| 83 | } | |
| 84 | ||
| 85 | struct sys_timer netx_timer = { | |
| 86 | .init = netx_timer_init, | |
| 87 | .offset = netx_gettimeoffset, | |
| 88 | }; |