1 /********************************************* 1 /***************************************************************************/
2 2
3 /* 3 /*
4 * timers.c - Generic hardware timer support. 4 * timers.c - Generic hardware timer support.
5 * 5 *
6 * Copyright (C) 1993 Hamish Macdonald 6 * Copyright (C) 1993 Hamish Macdonald
7 * Copyright (C) 1999 D. Jeff Dionne 7 * Copyright (C) 1999 D. Jeff Dionne
8 * Copyright (C) 2001 Georges Menie, Ken Desm 8 * Copyright (C) 2001 Georges Menie, Ken Desmet
9 * 9 *
10 * This file is subject to the terms and condi 10 * This file is subject to the terms and conditions of the GNU General Public
11 * License. See the file COPYING in the main 11 * License. See the file COPYING in the main directory of this archive
12 * for more details. 12 * for more details.
13 */ 13 */
14 14
15 /********************************************* 15 /***************************************************************************/
16 16
17 #include <linux/types.h> 17 #include <linux/types.h>
18 #include <linux/kernel.h> 18 #include <linux/kernel.h>
19 #include <linux/mm.h> 19 #include <linux/mm.h>
20 #include <linux/interrupt.h> 20 #include <linux/interrupt.h>
21 #include <linux/irq.h> 21 #include <linux/irq.h>
22 #include <linux/clocksource.h> 22 #include <linux/clocksource.h>
23 #include <linux/rtc.h> 23 #include <linux/rtc.h>
24 #include <asm/setup.h> 24 #include <asm/setup.h>
25 #include <asm/machdep.h> 25 #include <asm/machdep.h>
26 #include <asm/MC68VZ328.h> 26 #include <asm/MC68VZ328.h>
27 27
28 #include "m68328.h" 28 #include "m68328.h"
29 29
30 /********************************************* 30 /***************************************************************************/
31 31
32 #if defined(CONFIG_DRAGEN2) 32 #if defined(CONFIG_DRAGEN2)
33 /* with a 33.16 MHz clock, this will give usec 33 /* with a 33.16 MHz clock, this will give usec resolution to the time functions */
34 #define CLOCK_SOURCE TCTL_CLKSOURCE_SYSCLK 34 #define CLOCK_SOURCE TCTL_CLKSOURCE_SYSCLK
35 #define CLOCK_PRE 7 35 #define CLOCK_PRE 7
36 #define TICKS_PER_JIFFY 41450 36 #define TICKS_PER_JIFFY 41450
37 37
38 #elif defined(CONFIG_XCOPILOT_BUGS) 38 #elif defined(CONFIG_XCOPILOT_BUGS)
39 /* 39 /*
40 * The only thing I know is that CLK32 is not 40 * The only thing I know is that CLK32 is not available on Xcopilot
41 * I have little idea about what frequency SYS 41 * I have little idea about what frequency SYSCLK has on Xcopilot.
42 * The values for prescaler and compare regist 42 * The values for prescaler and compare registers were simply
43 * taken from the original source 43 * taken from the original source
44 */ 44 */
45 #define CLOCK_SOURCE TCTL_CLKSOURCE_SYSCLK 45 #define CLOCK_SOURCE TCTL_CLKSOURCE_SYSCLK
46 #define CLOCK_PRE 2 46 #define CLOCK_PRE 2
47 #define TICKS_PER_JIFFY 0xd7e4 47 #define TICKS_PER_JIFFY 0xd7e4
48 48
49 #else 49 #else
50 /* default to using the 32Khz clock */ 50 /* default to using the 32Khz clock */
51 #define CLOCK_SOURCE TCTL_CLKSOURCE_32KHZ 51 #define CLOCK_SOURCE TCTL_CLKSOURCE_32KHZ
52 #define CLOCK_PRE 31 52 #define CLOCK_PRE 31
53 #define TICKS_PER_JIFFY 10 53 #define TICKS_PER_JIFFY 10
54 #endif 54 #endif
55 55
56 static u32 m68328_tick_cnt; 56 static u32 m68328_tick_cnt;
57 57
58 /********************************************* 58 /***************************************************************************/
59 59
60 static irqreturn_t hw_tick(int irq, void *dumm 60 static irqreturn_t hw_tick(int irq, void *dummy)
61 { 61 {
62 /* Reset Timer1 */ 62 /* Reset Timer1 */
63 TSTAT &= 0; 63 TSTAT &= 0;
64 64
65 m68328_tick_cnt += TICKS_PER_JIFFY; 65 m68328_tick_cnt += TICKS_PER_JIFFY;
66 legacy_timer_tick(1); 66 legacy_timer_tick(1);
67 return IRQ_HANDLED; 67 return IRQ_HANDLED;
68 } 68 }
69 69
70 /********************************************* 70 /***************************************************************************/
71 71
72 static u64 m68328_read_clk(struct clocksource 72 static u64 m68328_read_clk(struct clocksource *cs)
73 { 73 {
74 unsigned long flags; 74 unsigned long flags;
75 u32 cycles; 75 u32 cycles;
76 76
77 local_irq_save(flags); 77 local_irq_save(flags);
78 cycles = m68328_tick_cnt + TCN; 78 cycles = m68328_tick_cnt + TCN;
79 local_irq_restore(flags); 79 local_irq_restore(flags);
80 80
81 return cycles; 81 return cycles;
82 } 82 }
83 83
84 /********************************************* 84 /***************************************************************************/
85 85
86 static struct clocksource m68328_clk = { 86 static struct clocksource m68328_clk = {
87 .name = "timer", 87 .name = "timer",
88 .rating = 250, 88 .rating = 250,
89 .read = m68328_read_clk, 89 .read = m68328_read_clk,
90 .mask = CLOCKSOURCE_MASK(32), 90 .mask = CLOCKSOURCE_MASK(32),
91 .flags = CLOCK_SOURCE_IS_CONTINUOUS, 91 .flags = CLOCK_SOURCE_IS_CONTINUOUS,
92 }; 92 };
93 93
94 /********************************************* 94 /***************************************************************************/
95 95
96 void hw_timer_init(void) 96 void hw_timer_init(void)
97 { 97 {
98 int ret; 98 int ret;
99 99
100 /* disable timer 1 */ 100 /* disable timer 1 */
101 TCTL = 0; 101 TCTL = 0;
102 102
103 /* set ISR */ 103 /* set ISR */
104 ret = request_irq(TMR_IRQ_NUM, hw_tick 104 ret = request_irq(TMR_IRQ_NUM, hw_tick, IRQF_TIMER, "timer", NULL);
105 if (ret) { 105 if (ret) {
106 pr_err("Failed to request irq 106 pr_err("Failed to request irq %d (timer): %pe\n", TMR_IRQ_NUM,
107 ERR_PTR(ret)); 107 ERR_PTR(ret));
108 } 108 }
109 109
110 /* Restart mode, Enable int, Set clock 110 /* Restart mode, Enable int, Set clock source */
111 TCTL = TCTL_OM | TCTL_IRQEN | CLOCK_SO 111 TCTL = TCTL_OM | TCTL_IRQEN | CLOCK_SOURCE;
112 TPRER = CLOCK_PRE; 112 TPRER = CLOCK_PRE;
113 TCMP = TICKS_PER_JIFFY; 113 TCMP = TICKS_PER_JIFFY;
114 114
115 /* Enable timer 1 */ 115 /* Enable timer 1 */
116 TCTL |= TCTL_TEN; 116 TCTL |= TCTL_TEN;
117 clocksource_register_hz(&m68328_clk, T 117 clocksource_register_hz(&m68328_clk, TICKS_PER_JIFFY*HZ);
118 } 118 }
119 119
120 /********************************************* 120 /***************************************************************************/
121 121
122 int m68328_hwclk(int set, struct rtc_time *t) 122 int m68328_hwclk(int set, struct rtc_time *t)
123 { 123 {
124 if (!set) { 124 if (!set) {
125 long now = RTCTIME; 125 long now = RTCTIME;
126 t->tm_year = 1; 126 t->tm_year = 1;
127 t->tm_mon = 0; 127 t->tm_mon = 0;
128 t->tm_mday = 1; 128 t->tm_mday = 1;
129 t->tm_hour = (now >> 24) % 24; 129 t->tm_hour = (now >> 24) % 24;
130 t->tm_min = (now >> 16) % 60; 130 t->tm_min = (now >> 16) % 60;
131 t->tm_sec = now % 60; 131 t->tm_sec = now % 60;
132 } 132 }
133 133
134 return 0; 134 return 0;
135 } 135 }
136 136
137 /********************************************* 137 /***************************************************************************/
138 138
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