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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> | |
1a815aed SH |
22 | #include <linux/irq.h> |
23 | #include <linux/clocksource.h> | |
bb6d8c88 SH |
24 | |
25 | #include <asm/hardware.h> | |
26 | #include <asm/io.h> | |
27 | #include <asm/mach/time.h> | |
28 | #include <asm/arch/netx-regs.h> | |
29 | ||
bb6d8c88 SH |
30 | /* |
31 | * IRQ handler for the timer | |
32 | */ | |
33 | static irqreturn_t | |
0cd61b68 | 34 | netx_timer_interrupt(int irq, void *dev_id) |
bb6d8c88 | 35 | { |
0cd61b68 | 36 | timer_tick(); |
1a815aed | 37 | |
bb6d8c88 SH |
38 | /* acknowledge interrupt */ |
39 | writel(COUNTER_BIT(0), NETX_GPIO_IRQ); | |
40 | ||
41 | return IRQ_HANDLED; | |
42 | } | |
43 | ||
bb6d8c88 SH |
44 | static struct irqaction netx_timer_irq = { |
45 | .name = "NetX Timer Tick", | |
b30fabad | 46 | .flags = IRQF_DISABLED | IRQF_TIMER | IRQF_IRQPOLL, |
bb6d8c88 SH |
47 | .handler = netx_timer_interrupt, |
48 | }; | |
49 | ||
1a815aed SH |
50 | cycle_t netx_get_cycles(void) |
51 | { | |
52 | return readl(NETX_GPIO_COUNTER_CURRENT(1)); | |
53 | } | |
54 | ||
55 | static struct clocksource clocksource_netx = { | |
56 | .name = "netx_timer", | |
57 | .rating = 200, | |
58 | .read = netx_get_cycles, | |
59 | .mask = CLOCKSOURCE_MASK(32), | |
60 | .shift = 20, | |
c66699a7 | 61 | .flags = CLOCK_SOURCE_IS_CONTINUOUS, |
1a815aed SH |
62 | }; |
63 | ||
bb6d8c88 SH |
64 | /* |
65 | * Set up timer interrupt | |
66 | */ | |
67 | static void __init netx_timer_init(void) | |
68 | { | |
69 | /* disable timer initially */ | |
70 | writel(0, NETX_GPIO_COUNTER_CTRL(0)); | |
71 | ||
72 | /* Reset the timer value to zero */ | |
73 | writel(0, NETX_GPIO_COUNTER_CURRENT(0)); | |
74 | ||
75 | writel(LATCH, NETX_GPIO_COUNTER_MAX(0)); | |
76 | ||
77 | /* acknowledge interrupt */ | |
78 | writel(COUNTER_BIT(0), NETX_GPIO_IRQ); | |
79 | ||
80 | /* Enable the interrupt in the specific timer register and start timer */ | |
81 | writel(COUNTER_BIT(0), NETX_GPIO_IRQ_ENABLE); | |
82 | writel(NETX_GPIO_COUNTER_CTRL_IRQ_EN | NETX_GPIO_COUNTER_CTRL_RUN, | |
83 | NETX_GPIO_COUNTER_CTRL(0)); | |
84 | ||
85 | setup_irq(NETX_IRQ_TIMER0, &netx_timer_irq); | |
1a815aed SH |
86 | |
87 | /* Setup timer one for clocksource */ | |
88 | writel(0, NETX_GPIO_COUNTER_CTRL(1)); | |
89 | writel(0, NETX_GPIO_COUNTER_CURRENT(1)); | |
90 | writel(0xFFFFFFFF, NETX_GPIO_COUNTER_MAX(1)); | |
91 | ||
92 | writel(NETX_GPIO_COUNTER_CTRL_RUN, | |
93 | NETX_GPIO_COUNTER_CTRL(1)); | |
94 | ||
95 | clocksource_netx.mult = | |
96 | clocksource_hz2mult(CLOCK_TICK_RATE, clocksource_netx.shift); | |
97 | clocksource_register(&clocksource_netx); | |
bb6d8c88 SH |
98 | } |
99 | ||
100 | struct sys_timer netx_timer = { | |
1a815aed | 101 | .init = netx_timer_init, |
bb6d8c88 | 102 | }; |