diff options
author | Greg Ungerer <gerg@snapgear.com> | 2007-07-29 21:38:47 -0400 |
---|---|---|
committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2007-10-12 18:43:04 -0400 |
commit | 699a714501f028b1db2bf741111a0df856128899 (patch) | |
tree | b19db64787699fb864c80eda0ceb9a7e7d4a8739 /arch/arm/mach-at91 | |
parent | 7a8be08b1be0bb2a973787bdf888e0a4177cdcd8 (diff) |
[ARM] 4533/1: AT91x40 timer support
Support for the timers in the Atmel AT91x40 family of CPUs.
Signed-off-by: Greg Ungerer <gerg@uclinux.org>
Acked-by: Andrew Victor <andrew@sanpeople.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/mach-at91')
-rw-r--r-- | arch/arm/mach-at91/at91x40_time.c | 80 |
1 files changed, 80 insertions, 0 deletions
diff --git a/arch/arm/mach-at91/at91x40_time.c b/arch/arm/mach-at91/at91x40_time.c new file mode 100644 index 000000000000..eddc882f1b4a --- /dev/null +++ b/arch/arm/mach-at91/at91x40_time.c | |||
@@ -0,0 +1,80 @@ | |||
1 | /* | ||
2 | * arch/arm/mach-at91/at91x40_time.c | ||
3 | * | ||
4 | * (C) Copyright 2007, Greg Ungerer <gerg@snapgear.com> | ||
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 as published by | ||
8 | * the Free Software Foundation; either version 2 of the License, or | ||
9 | * (at your option) any later version. | ||
10 | * | ||
11 | * This program is distributed in the hope that it will be useful, | ||
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
14 | * GNU General Public License for more details. | ||
15 | * | ||
16 | * You should have received a copy of the GNU General Public License | ||
17 | * along with this program; if not, write to the Free Software | ||
18 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | ||
19 | */ | ||
20 | |||
21 | #include <linux/kernel.h> | ||
22 | #include <linux/init.h> | ||
23 | #include <linux/interrupt.h> | ||
24 | #include <linux/irq.h> | ||
25 | #include <linux/time.h> | ||
26 | #include <asm/hardware.h> | ||
27 | #include <asm/io.h> | ||
28 | #include <asm/mach/time.h> | ||
29 | #include <asm/arch/at91_tc.h> | ||
30 | |||
31 | /* | ||
32 | * 3 counter/timer units present. | ||
33 | */ | ||
34 | #define AT91_TC_CLK0BASE 0 | ||
35 | #define AT91_TC_CLK1BASE 0x40 | ||
36 | #define AT91_TC_CLK2BASE 0x80 | ||
37 | |||
38 | static unsigned long at91x40_gettimeoffset(void) | ||
39 | { | ||
40 | return (at91_sys_read(AT91_TC + AT91_TC_CLK1BASE + AT91_TC_CV) * 1000000 / (AT91X40_MASTER_CLOCK / 128)); | ||
41 | } | ||
42 | |||
43 | static irqreturn_t at91x40_timer_interrupt(int irq, void *dev_id) | ||
44 | { | ||
45 | at91_sys_read(AT91_TC + AT91_TC_CLK1BASE + AT91_TC_SR); | ||
46 | timer_tick(); | ||
47 | return IRQ_HANDLED; | ||
48 | } | ||
49 | |||
50 | static struct irqaction at91x40_timer_irq = { | ||
51 | .name = "at91_tick", | ||
52 | .flags = IRQF_DISABLED | IRQF_TIMER, | ||
53 | .handler = at91x40_timer_interrupt | ||
54 | }; | ||
55 | |||
56 | void __init at91x40_timer_init(void) | ||
57 | { | ||
58 | unsigned int v; | ||
59 | |||
60 | at91_sys_write(AT91_TC + AT91_TC_BCR, 0); | ||
61 | v = at91_sys_read(AT91_TC + AT91_TC_BMR); | ||
62 | v = (v & ~AT91_TC_TC1XC1S) | AT91_TC_TC1XC1S_NONE; | ||
63 | at91_sys_write(AT91_TC + AT91_TC_BMR, v); | ||
64 | |||
65 | at91_sys_write(AT91_TC + AT91_TC_CLK1BASE + AT91_TC_CCR, AT91_TC_CLKDIS); | ||
66 | at91_sys_write(AT91_TC + AT91_TC_CLK1BASE + AT91_TC_CMR, (AT91_TC_TIMER_CLOCK4 | AT91_TC_CPCTRG)); | ||
67 | at91_sys_write(AT91_TC + AT91_TC_CLK1BASE + AT91_TC_IDR, 0xffffffff); | ||
68 | at91_sys_write(AT91_TC + AT91_TC_CLK1BASE + AT91_TC_RC, (AT91X40_MASTER_CLOCK / 128) / HZ - 1); | ||
69 | at91_sys_write(AT91_TC + AT91_TC_CLK1BASE + AT91_TC_IER, (1<<4)); | ||
70 | |||
71 | setup_irq(AT91X40_ID_TC1, &at91x40_timer_irq); | ||
72 | |||
73 | at91_sys_write(AT91_TC + AT91_TC_CLK1BASE + AT91_TC_CCR, (AT91_TC_SWTRG | AT91_TC_CLKEN)); | ||
74 | } | ||
75 | |||
76 | struct sys_timer at91x40_timer = { | ||
77 | .init = at91x40_timer_init, | ||
78 | .offset = at91x40_gettimeoffset, | ||
79 | }; | ||
80 | |||