diff options
Diffstat (limited to 'arch/arm/mach-iop13xx/time.c')
-rw-r--r-- | arch/arm/mach-iop13xx/time.c | 102 |
1 files changed, 0 insertions, 102 deletions
diff --git a/arch/arm/mach-iop13xx/time.c b/arch/arm/mach-iop13xx/time.c deleted file mode 100644 index 8b21365f653f..000000000000 --- a/arch/arm/mach-iop13xx/time.c +++ /dev/null | |||
@@ -1,102 +0,0 @@ | |||
1 | /* | ||
2 | * arch/arm/mach-iop13xx/time.c | ||
3 | * | ||
4 | * Timer code for IOP13xx (copied from IOP32x/IOP33x implementation) | ||
5 | * | ||
6 | * Author: Deepak Saxena <dsaxena@mvista.com> | ||
7 | * | ||
8 | * Copyright 2002-2003 MontaVista Software Inc. | ||
9 | * | ||
10 | * This program is free software; you can redistribute it and/or modify it | ||
11 | * under the terms of the GNU General Public License as published by the | ||
12 | * Free Software Foundation; either version 2 of the License, or (at your | ||
13 | * option) any later version. | ||
14 | */ | ||
15 | |||
16 | #include <linux/kernel.h> | ||
17 | #include <linux/interrupt.h> | ||
18 | #include <linux/time.h> | ||
19 | #include <linux/init.h> | ||
20 | #include <linux/timex.h> | ||
21 | #include <asm/io.h> | ||
22 | #include <asm/irq.h> | ||
23 | #include <asm/uaccess.h> | ||
24 | #include <asm/mach/irq.h> | ||
25 | #include <asm/mach/time.h> | ||
26 | |||
27 | static unsigned long ticks_per_jiffy; | ||
28 | static unsigned long ticks_per_usec; | ||
29 | static unsigned long next_jiffy_time; | ||
30 | |||
31 | static inline u32 read_tcr1(void) | ||
32 | { | ||
33 | u32 val; | ||
34 | asm volatile("mrc p6, 0, %0, c3, c9, 0" : "=r" (val)); | ||
35 | return val; | ||
36 | } | ||
37 | |||
38 | unsigned long iop13xx_gettimeoffset(void) | ||
39 | { | ||
40 | unsigned long offset; | ||
41 | u32 cp_flags; | ||
42 | |||
43 | cp_flags = iop13xx_cp6_save(); | ||
44 | offset = next_jiffy_time - read_tcr1(); | ||
45 | iop13xx_cp6_restore(cp_flags); | ||
46 | |||
47 | return offset / ticks_per_usec; | ||
48 | } | ||
49 | |||
50 | static irqreturn_t | ||
51 | iop13xx_timer_interrupt(int irq, void *dev_id) | ||
52 | { | ||
53 | u32 cp_flags = iop13xx_cp6_save(); | ||
54 | |||
55 | write_seqlock(&xtime_lock); | ||
56 | |||
57 | asm volatile("mcr p6, 0, %0, c6, c9, 0" : : "r" (1)); | ||
58 | |||
59 | while ((signed long)(next_jiffy_time - read_tcr1()) | ||
60 | >= ticks_per_jiffy) { | ||
61 | timer_tick(); | ||
62 | next_jiffy_time -= ticks_per_jiffy; | ||
63 | } | ||
64 | |||
65 | write_sequnlock(&xtime_lock); | ||
66 | |||
67 | iop13xx_cp6_restore(cp_flags); | ||
68 | |||
69 | return IRQ_HANDLED; | ||
70 | } | ||
71 | |||
72 | static struct irqaction iop13xx_timer_irq = { | ||
73 | .name = "IOP13XX Timer Tick", | ||
74 | .handler = iop13xx_timer_interrupt, | ||
75 | .flags = IRQF_DISABLED | IRQF_TIMER, | ||
76 | }; | ||
77 | |||
78 | void __init iop13xx_init_time(unsigned long tick_rate) | ||
79 | { | ||
80 | u32 timer_ctl; | ||
81 | u32 cp_flags; | ||
82 | |||
83 | ticks_per_jiffy = (tick_rate + HZ/2) / HZ; | ||
84 | ticks_per_usec = tick_rate / 1000000; | ||
85 | next_jiffy_time = 0xffffffff; | ||
86 | |||
87 | timer_ctl = IOP13XX_TMR_EN | IOP13XX_TMR_PRIVILEGED | | ||
88 | IOP13XX_TMR_RELOAD | IOP13XX_TMR_RATIO_1_1; | ||
89 | |||
90 | /* | ||
91 | * We use timer 0 for our timer interrupt, and timer 1 as | ||
92 | * monotonic counter for tracking missed jiffies. | ||
93 | */ | ||
94 | cp_flags = iop13xx_cp6_save(); | ||
95 | asm volatile("mcr p6, 0, %0, c4, c9, 0" : : "r" (ticks_per_jiffy - 1)); | ||
96 | asm volatile("mcr p6, 0, %0, c0, c9, 0" : : "r" (timer_ctl)); | ||
97 | asm volatile("mcr p6, 0, %0, c5, c9, 0" : : "r" (0xffffffff)); | ||
98 | asm volatile("mcr p6, 0, %0, c1, c9, 0" : : "r" (timer_ctl)); | ||
99 | iop13xx_cp6_restore(cp_flags); | ||
100 | |||
101 | setup_irq(IRQ_IOP13XX_TIMER0, &iop13xx_timer_irq); | ||
102 | } | ||