diff options
author | Andrew Victor <andrew@sanpeople.com> | 2007-02-05 05:42:07 -0500 |
---|---|---|
committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2007-02-08 09:50:56 -0500 |
commit | 9d0412680e6c7b685ee466842047bcfb924d6dc5 (patch) | |
tree | c79300964ef1aca5d24571696f95e76b37c14679 /arch/arm/mach-at91rm9200/at91rm9200_time.c | |
parent | a93d48cc6019f84394b31d10c0d830a3b71696be (diff) |
[ARM] 4124/1: Rename mach-at91rm9200 and arch-at91rm9200 directories
Now that Linux includes support for the Atmel AT91SAM9260 and
AT91SAM9261 processors in addition to the original Atmel AT91RM9200
(with support for more AT91 processors pending), the "mach-at91rm9200"
and "arch-at91rm9200" directories should be renamed to indicate their
more generic nature.
The following git commands should be run BEFORE applying this patch:
git-mv arch/arm/mach-at91rm9200 arch/arm/mach-at91
git-mv include/asm-arm/arch-at91rm9200 include/asm-arm/arch-at91
Signed-off-by: Andrew Victor <andrew@sanpeople.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/mach-at91rm9200/at91rm9200_time.c')
-rw-r--r-- | arch/arm/mach-at91rm9200/at91rm9200_time.c | 146 |
1 files changed, 0 insertions, 146 deletions
diff --git a/arch/arm/mach-at91rm9200/at91rm9200_time.c b/arch/arm/mach-at91rm9200/at91rm9200_time.c deleted file mode 100644 index b999e192a7e9..000000000000 --- a/arch/arm/mach-at91rm9200/at91rm9200_time.c +++ /dev/null | |||
@@ -1,146 +0,0 @@ | |||
1 | /* | ||
2 | * linux/arch/arm/mach-at91rm9200/at91rm9200_time.c | ||
3 | * | ||
4 | * Copyright (C) 2003 SAN People | ||
5 | * Copyright (C) 2003 ATMEL | ||
6 | * | ||
7 | * This program is free software; you can redistribute it and/or modify | ||
8 | * it under the terms of the GNU General Public License as published by | ||
9 | * the Free Software Foundation; either version 2 of the License, or | ||
10 | * (at your option) any later version. | ||
11 | * | ||
12 | * This program is distributed in the hope that it will be useful, | ||
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
15 | * GNU General Public License for more details. | ||
16 | * | ||
17 | * You should have received a copy of the GNU General Public License | ||
18 | * along with this program; if not, write to the Free Software | ||
19 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | ||
20 | */ | ||
21 | |||
22 | #include <linux/init.h> | ||
23 | #include <linux/interrupt.h> | ||
24 | #include <linux/irq.h> | ||
25 | #include <linux/kernel.h> | ||
26 | #include <linux/sched.h> | ||
27 | #include <linux/time.h> | ||
28 | |||
29 | #include <asm/hardware.h> | ||
30 | #include <asm/io.h> | ||
31 | #include <asm/mach/time.h> | ||
32 | |||
33 | #include <asm/arch/at91_st.h> | ||
34 | |||
35 | static unsigned long last_crtr; | ||
36 | |||
37 | /* | ||
38 | * The ST_CRTR is updated asynchronously to the master clock. It is therefore | ||
39 | * necessary to read it twice (with the same value) to ensure accuracy. | ||
40 | */ | ||
41 | static inline unsigned long read_CRTR(void) { | ||
42 | unsigned long x1, x2; | ||
43 | |||
44 | do { | ||
45 | x1 = at91_sys_read(AT91_ST_CRTR); | ||
46 | x2 = at91_sys_read(AT91_ST_CRTR); | ||
47 | } while (x1 != x2); | ||
48 | |||
49 | return x1; | ||
50 | } | ||
51 | |||
52 | /* | ||
53 | * Returns number of microseconds since last timer interrupt. Note that interrupts | ||
54 | * will have been disabled by do_gettimeofday() | ||
55 | * 'LATCH' is hwclock ticks (see CLOCK_TICK_RATE in timex.h) per jiffy. | ||
56 | * 'tick' is usecs per jiffy (linux/timex.h). | ||
57 | */ | ||
58 | static unsigned long at91rm9200_gettimeoffset(void) | ||
59 | { | ||
60 | unsigned long elapsed; | ||
61 | |||
62 | elapsed = (read_CRTR() - last_crtr) & AT91_ST_ALMV; | ||
63 | |||
64 | return (unsigned long)(elapsed * (tick_nsec / 1000)) / LATCH; | ||
65 | } | ||
66 | |||
67 | /* | ||
68 | * IRQ handler for the timer. | ||
69 | */ | ||
70 | static irqreturn_t at91rm9200_timer_interrupt(int irq, void *dev_id) | ||
71 | { | ||
72 | if (at91_sys_read(AT91_ST_SR) & AT91_ST_PITS) { /* This is a shared interrupt */ | ||
73 | write_seqlock(&xtime_lock); | ||
74 | |||
75 | while (((read_CRTR() - last_crtr) & AT91_ST_ALMV) >= LATCH) { | ||
76 | timer_tick(); | ||
77 | last_crtr = (last_crtr + LATCH) & AT91_ST_ALMV; | ||
78 | } | ||
79 | |||
80 | write_sequnlock(&xtime_lock); | ||
81 | |||
82 | return IRQ_HANDLED; | ||
83 | } | ||
84 | else | ||
85 | return IRQ_NONE; /* not handled */ | ||
86 | } | ||
87 | |||
88 | static struct irqaction at91rm9200_timer_irq = { | ||
89 | .name = "at91_tick", | ||
90 | .flags = IRQF_SHARED | IRQF_DISABLED | IRQF_TIMER, | ||
91 | .handler = at91rm9200_timer_interrupt | ||
92 | }; | ||
93 | |||
94 | void at91rm9200_timer_reset(void) | ||
95 | { | ||
96 | last_crtr = 0; | ||
97 | |||
98 | /* Real time counter incremented every 30.51758 microseconds */ | ||
99 | at91_sys_write(AT91_ST_RTMR, 1); | ||
100 | |||
101 | /* Set Period Interval timer */ | ||
102 | at91_sys_write(AT91_ST_PIMR, LATCH); | ||
103 | |||
104 | /* Clear any pending interrupts */ | ||
105 | (void) at91_sys_read(AT91_ST_SR); | ||
106 | |||
107 | /* Enable Period Interval Timer interrupt */ | ||
108 | at91_sys_write(AT91_ST_IER, AT91_ST_PITS); | ||
109 | } | ||
110 | |||
111 | /* | ||
112 | * Set up timer interrupt. | ||
113 | */ | ||
114 | void __init at91rm9200_timer_init(void) | ||
115 | { | ||
116 | /* Disable all timer interrupts */ | ||
117 | at91_sys_write(AT91_ST_IDR, AT91_ST_PITS | AT91_ST_WDOVF | AT91_ST_RTTINC | AT91_ST_ALMS); | ||
118 | (void) at91_sys_read(AT91_ST_SR); /* Clear any pending interrupts */ | ||
119 | |||
120 | /* Make IRQs happen for the system timer */ | ||
121 | setup_irq(AT91_ID_SYS, &at91rm9200_timer_irq); | ||
122 | |||
123 | /* Change the kernel's 'tick' value to 10009 usec. (the default is 10000) */ | ||
124 | tick_usec = (LATCH * 1000000) / CLOCK_TICK_RATE; | ||
125 | |||
126 | /* Initialize and enable the timer interrupt */ | ||
127 | at91rm9200_timer_reset(); | ||
128 | } | ||
129 | |||
130 | #ifdef CONFIG_PM | ||
131 | static void at91rm9200_timer_suspend(void) | ||
132 | { | ||
133 | /* disable Period Interval Timer interrupt */ | ||
134 | at91_sys_write(AT91_ST_IDR, AT91_ST_PITS); | ||
135 | } | ||
136 | #else | ||
137 | #define at91rm9200_timer_suspend NULL | ||
138 | #endif | ||
139 | |||
140 | struct sys_timer at91rm9200_timer = { | ||
141 | .init = at91rm9200_timer_init, | ||
142 | .offset = at91rm9200_gettimeoffset, | ||
143 | .suspend = at91rm9200_timer_suspend, | ||
144 | .resume = at91rm9200_timer_reset, | ||
145 | }; | ||
146 | |||