Commit | Line | Data |
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75003c48 GU |
1 | /***************************************************************************/ |
2 | ||
3 | /* | |
99e08374 | 4 | * timers.c - Generic hardware timer support. |
75003c48 GU |
5 | * |
6 | * Copyright (C) 1993 Hamish Macdonald | |
7 | * Copyright (C) 1999 D. Jeff Dionne | |
8 | * Copyright (C) 2001 Georges Menie, Ken Desmet | |
9 | * | |
10 | * This file is subject to the terms and conditions of the GNU General Public | |
11 | * License. See the file COPYING in the main directory of this archive | |
12 | * for more details. | |
13 | */ | |
14 | ||
15 | /***************************************************************************/ | |
16 | ||
75003c48 GU |
17 | #include <linux/types.h> |
18 | #include <linux/kernel.h> | |
19 | #include <linux/mm.h> | |
1ea9acc7 | 20 | #include <linux/interrupt.h> |
be03e56b | 21 | #include <linux/irq.h> |
36a90f26 | 22 | #include <linux/clocksource.h> |
95177461 | 23 | #include <linux/rtc.h> |
75003c48 | 24 | #include <asm/setup.h> |
75003c48 GU |
25 | #include <asm/machdep.h> |
26 | #include <asm/MC68VZ328.h> | |
27 | ||
28 | /***************************************************************************/ | |
29 | ||
30 | #if defined(CONFIG_DRAGEN2) | |
31 | /* with a 33.16 MHz clock, this will give usec resolution to the time functions */ | |
32 | #define CLOCK_SOURCE TCTL_CLKSOURCE_SYSCLK | |
33 | #define CLOCK_PRE 7 | |
34 | #define TICKS_PER_JIFFY 41450 | |
35 | ||
36 | #elif defined(CONFIG_XCOPILOT_BUGS) | |
37 | /* | |
38 | * The only thing I know is that CLK32 is not available on Xcopilot | |
39 | * I have little idea about what frequency SYSCLK has on Xcopilot. | |
40 | * The values for prescaler and compare registers were simply | |
41 | * taken from the original source | |
42 | */ | |
43 | #define CLOCK_SOURCE TCTL_CLKSOURCE_SYSCLK | |
44 | #define CLOCK_PRE 2 | |
45 | #define TICKS_PER_JIFFY 0xd7e4 | |
46 | ||
47 | #else | |
48 | /* default to using the 32Khz clock */ | |
49 | #define CLOCK_SOURCE TCTL_CLKSOURCE_32KHZ | |
50 | #define CLOCK_PRE 31 | |
51 | #define TICKS_PER_JIFFY 10 | |
52 | #endif | |
53 | ||
36a90f26 GU |
54 | static u32 m68328_tick_cnt; |
55 | ||
56 | /***************************************************************************/ | |
57 | ||
58 | static irqreturn_t hw_tick(int irq, void *dummy) | |
59 | { | |
60 | /* Reset Timer1 */ | |
61 | TSTAT &= 0; | |
62 | ||
63 | m68328_tick_cnt += TICKS_PER_JIFFY; | |
09323308 AB |
64 | legacy_timer_tick(1); |
65 | return IRQ_HANDLED; | |
36a90f26 GU |
66 | } |
67 | ||
75003c48 GU |
68 | /***************************************************************************/ |
69 | ||
a5a1d1c2 | 70 | static u64 m68328_read_clk(struct clocksource *cs) |
36a90f26 GU |
71 | { |
72 | unsigned long flags; | |
73 | u32 cycles; | |
74 | ||
75 | local_irq_save(flags); | |
76 | cycles = m68328_tick_cnt + TCN; | |
77 | local_irq_restore(flags); | |
78 | ||
79 | return cycles; | |
80 | } | |
81 | ||
82 | /***************************************************************************/ | |
83 | ||
84 | static struct clocksource m68328_clk = { | |
85 | .name = "timer", | |
86 | .rating = 250, | |
87 | .read = m68328_read_clk, | |
36a90f26 GU |
88 | .mask = CLOCKSOURCE_MASK(32), |
89 | .flags = CLOCK_SOURCE_IS_CONTINUOUS, | |
90 | }; | |
91 | ||
92 | /***************************************************************************/ | |
93 | ||
f9a01539 | 94 | void hw_timer_init(void) |
75003c48 | 95 | { |
ba000760 | 96 | int ret; |
97 | ||
75003c48 GU |
98 | /* disable timer 1 */ |
99 | TCTL = 0; | |
100 | ||
101 | /* set ISR */ | |
ba000760 | 102 | ret = request_irq(TMR_IRQ_NUM, hw_tick, IRQF_TIMER, "timer", NULL); |
103 | if (ret) { | |
104 | pr_err("Failed to request irq %d (timer): %pe\n", TMR_IRQ_NUM, | |
105 | ERR_PTR(ret)); | |
106 | } | |
75003c48 GU |
107 | |
108 | /* Restart mode, Enable int, Set clock source */ | |
109 | TCTL = TCTL_OM | TCTL_IRQEN | CLOCK_SOURCE; | |
110 | TPRER = CLOCK_PRE; | |
111 | TCMP = TICKS_PER_JIFFY; | |
112 | ||
113 | /* Enable timer 1 */ | |
114 | TCTL |= TCTL_TEN; | |
010f3f16 | 115 | clocksource_register_hz(&m68328_clk, TICKS_PER_JIFFY*HZ); |
75003c48 GU |
116 | } |
117 | ||
118 | /***************************************************************************/ | |
119 | ||
95177461 | 120 | int m68328_hwclk(int set, struct rtc_time *t) |
75003c48 | 121 | { |
95177461 GU |
122 | if (!set) { |
123 | long now = RTCTIME; | |
b65769fc FT |
124 | t->tm_year = 1; |
125 | t->tm_mon = 0; | |
126 | t->tm_mday = 1; | |
95177461 GU |
127 | t->tm_hour = (now >> 24) % 24; |
128 | t->tm_min = (now >> 16) % 60; | |
129 | t->tm_sec = now % 60; | |
130 | } | |
131 | ||
132 | return 0; | |
75003c48 GU |
133 | } |
134 | ||
135 | /***************************************************************************/ |