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Greg Ungerer75003c42005-09-09 09:32:14 +10001/***************************************************************************/
2
3/*
Luis Alves99e08372012-12-04 23:04:49 +00004 * timers.c - Generic hardware timer support.
Greg Ungerer75003c42005-09-09 09:32:14 +10005 *
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
Greg Ungerer75003c42005-09-09 09:32:14 +100017#include <linux/types.h>
18#include <linux/kernel.h>
19#include <linux/mm.h>
Greg Ungerer1ea9acc2007-03-07 11:28:13 +100020#include <linux/interrupt.h>
Greg Ungererbe03e562007-07-27 01:09:00 +100021#include <linux/irq.h>
Greg Ungerer36a90f22008-02-01 17:40:17 +100022#include <linux/clocksource.h>
Greg Ungerer95177462012-01-23 13:25:56 +100023#include <linux/rtc.h>
Greg Ungerer75003c42005-09-09 09:32:14 +100024#include <asm/setup.h>
Greg Ungerer75003c42005-09-09 09:32:14 +100025#include <asm/pgtable.h>
Greg Ungerer75003c42005-09-09 09:32:14 +100026#include <asm/machdep.h>
27#include <asm/MC68VZ328.h>
28
29/***************************************************************************/
30
31#if defined(CONFIG_DRAGEN2)
32/* with a 33.16 MHz clock, this will give usec resolution to the time functions */
33#define CLOCK_SOURCE TCTL_CLKSOURCE_SYSCLK
34#define CLOCK_PRE 7
35#define TICKS_PER_JIFFY 41450
36
37#elif defined(CONFIG_XCOPILOT_BUGS)
38/*
39 * The only thing I know is that CLK32 is not available on Xcopilot
40 * I have little idea about what frequency SYSCLK has on Xcopilot.
41 * The values for prescaler and compare registers were simply
42 * taken from the original source
43 */
44#define CLOCK_SOURCE TCTL_CLKSOURCE_SYSCLK
45#define CLOCK_PRE 2
46#define TICKS_PER_JIFFY 0xd7e4
47
48#else
49/* default to using the 32Khz clock */
50#define CLOCK_SOURCE TCTL_CLKSOURCE_32KHZ
51#define CLOCK_PRE 31
52#define TICKS_PER_JIFFY 10
53#endif
54
Greg Ungerer36a90f22008-02-01 17:40:17 +100055static u32 m68328_tick_cnt;
Greg Ungererdc5588a2012-05-23 13:27:18 +100056static irq_handler_t timer_interrupt;
Greg Ungerer36a90f22008-02-01 17:40:17 +100057
58/***************************************************************************/
59
60static irqreturn_t hw_tick(int irq, void *dummy)
61{
62 /* Reset Timer1 */
63 TSTAT &= 0;
64
65 m68328_tick_cnt += TICKS_PER_JIFFY;
Greg Ungererdc5588a2012-05-23 13:27:18 +100066 return timer_interrupt(irq, dummy);
Greg Ungerer36a90f22008-02-01 17:40:17 +100067}
68
Greg Ungerer75003c42005-09-09 09:32:14 +100069/***************************************************************************/
70
Greg Ungererbe03e562007-07-27 01:09:00 +100071static struct irqaction m68328_timer_irq = {
Greg Ungerer84675712007-10-24 12:03:20 +100072 .name = "timer",
Michael Opdenacker77a42792013-09-07 07:43:08 +020073 .flags = IRQF_TIMER,
Greg Ungerer84675712007-10-24 12:03:20 +100074 .handler = hw_tick,
Greg Ungererbe03e562007-07-27 01:09:00 +100075};
76
Greg Ungerer36a90f22008-02-01 17:40:17 +100077/***************************************************************************/
78
Magnus Damm8e196082009-04-21 12:24:00 -070079static cycle_t m68328_read_clk(struct clocksource *cs)
Greg Ungerer36a90f22008-02-01 17:40:17 +100080{
81 unsigned long flags;
82 u32 cycles;
83
84 local_irq_save(flags);
85 cycles = m68328_tick_cnt + TCN;
86 local_irq_restore(flags);
87
88 return cycles;
89}
90
91/***************************************************************************/
92
93static struct clocksource m68328_clk = {
94 .name = "timer",
95 .rating = 250,
96 .read = m68328_read_clk,
Greg Ungerer36a90f22008-02-01 17:40:17 +100097 .mask = CLOCKSOURCE_MASK(32),
98 .flags = CLOCK_SOURCE_IS_CONTINUOUS,
99};
100
101/***************************************************************************/
102
Greg Ungererdc5588a2012-05-23 13:27:18 +1000103void hw_timer_init(irq_handler_t handler)
Greg Ungerer75003c42005-09-09 09:32:14 +1000104{
105 /* disable timer 1 */
106 TCTL = 0;
107
108 /* set ISR */
Greg Ungererbe03e562007-07-27 01:09:00 +1000109 setup_irq(TMR_IRQ_NUM, &m68328_timer_irq);
Greg Ungerer75003c42005-09-09 09:32:14 +1000110
111 /* Restart mode, Enable int, Set clock source */
112 TCTL = TCTL_OM | TCTL_IRQEN | CLOCK_SOURCE;
113 TPRER = CLOCK_PRE;
114 TCMP = TICKS_PER_JIFFY;
115
116 /* Enable timer 1 */
117 TCTL |= TCTL_TEN;
John Stultz010f3f12010-04-26 20:21:52 -0700118 clocksource_register_hz(&m68328_clk, TICKS_PER_JIFFY*HZ);
Greg Ungererdc5588a2012-05-23 13:27:18 +1000119 timer_interrupt = handler;
Greg Ungerer75003c42005-09-09 09:32:14 +1000120}
121
122/***************************************************************************/
123
Greg Ungerer95177462012-01-23 13:25:56 +1000124int m68328_hwclk(int set, struct rtc_time *t)
Greg Ungerer75003c42005-09-09 09:32:14 +1000125{
Greg Ungerer95177462012-01-23 13:25:56 +1000126 if (!set) {
127 long now = RTCTIME;
128 t->tm_year = t->tm_mon = t->tm_mday = 1;
129 t->tm_hour = (now >> 24) % 24;
130 t->tm_min = (now >> 16) % 60;
131 t->tm_sec = now % 60;
132 }
Greg Ungerer75003c42005-09-09 09:32:14 +1000133
Greg Ungerer95177462012-01-23 13:25:56 +1000134 return 0;
Greg Ungerer75003c42005-09-09 09:32:14 +1000135}
136
137/***************************************************************************/