1/*
2 *  arch/m68k/mvme147/config.c
3 *
4 *  Copyright (C) 1996 Dave Frascone [chaos@mindspring.com]
5 *  Cloned from        Richard Hirst [richard@sleepie.demon.co.uk]
6 *
7 * Based on:
8 *
9 *  Copyright (C) 1993 Hamish Macdonald
10 *
11 * This file is subject to the terms and conditions of the GNU General Public
12 * License.  See the file README.legal in the main directory of this archive
13 * for more details.
14 */
15
16#include <linux/types.h>
17#include <linux/kernel.h>
18#include <linux/mm.h>
19#include <linux/tty.h>
20#include <linux/clocksource.h>
21#include <linux/console.h>
22#include <linux/linkage.h>
23#include <linux/init.h>
24#include <linux/major.h>
25#include <linux/rtc.h>
26#include <linux/interrupt.h>
27
28#include <asm/bootinfo.h>
29#include <asm/bootinfo-vme.h>
30#include <asm/byteorder.h>
31#include <asm/setup.h>
32#include <asm/irq.h>
33#include <asm/traps.h>
34#include <asm/machdep.h>
35#include <asm/mvme147hw.h>
36#include <asm/config.h>
37
38
39static void mvme147_get_model(char *model);
40extern void mvme147_sched_init(void);
41extern int mvme147_hwclk (int, struct rtc_time *);
42extern void mvme147_reset (void);
43
44
45static int bcd2int (unsigned char b);
46
47
48int __init mvme147_parse_bootinfo(const struct bi_record *bi)
49{
50	uint16_t tag = be16_to_cpu(bi->tag);
51	if (tag == BI_VME_TYPE || tag == BI_VME_BRDINFO)
52		return 0;
53	else
54		return 1;
55}
56
57void mvme147_reset(void)
58{
59	pr_info("\r\n\nCalled mvme147_reset\r\n");
60	m147_pcc->watchdog = 0x0a;	/* Clear timer */
61	m147_pcc->watchdog = 0xa5;	/* Enable watchdog - 100ms to reset */
62	while (1)
63		;
64}
65
66static void mvme147_get_model(char *model)
67{
68	sprintf(model, "Motorola MVME147");
69}
70
71/*
72 * This function is called during kernel startup to initialize
73 * the mvme147 IRQ handling routines.
74 */
75
76void __init mvme147_init_IRQ(void)
77{
78	m68k_setup_user_interrupt(VEC_USER, 192);
79}
80
81void __init config_mvme147(void)
82{
83	mach_sched_init		= mvme147_sched_init;
84	mach_init_IRQ		= mvme147_init_IRQ;
85	mach_hwclk		= mvme147_hwclk;
86	mach_reset		= mvme147_reset;
87	mach_get_model		= mvme147_get_model;
88
89	/* Board type is only set by newer versions of vmelilo/tftplilo */
90	if (!vme_brdtype)
91		vme_brdtype = VME_TYPE_MVME147;
92}
93
94static u64 mvme147_read_clk(struct clocksource *cs);
95
96static struct clocksource mvme147_clk = {
97	.name   = "pcc",
98	.rating = 250,
99	.read   = mvme147_read_clk,
100	.mask   = CLOCKSOURCE_MASK(32),
101	.flags  = CLOCK_SOURCE_IS_CONTINUOUS,
102};
103
104static u32 clk_total;
105
106#define PCC_TIMER_CLOCK_FREQ 160000
107#define PCC_TIMER_CYCLES     (PCC_TIMER_CLOCK_FREQ / HZ)
108#define PCC_TIMER_PRELOAD    (0x10000 - PCC_TIMER_CYCLES)
109
110/* Using pcc tick timer 1 */
111
112static irqreturn_t mvme147_timer_int (int irq, void *dev_id)
113{
114	unsigned long flags;
115
116	local_irq_save(flags);
117	m147_pcc->t1_cntrl = PCC_TIMER_CLR_OVF | PCC_TIMER_COC_EN |
118			     PCC_TIMER_TIC_EN;
119	m147_pcc->t1_int_cntrl = PCC_INT_ENAB | PCC_TIMER_INT_CLR |
120				 PCC_LEVEL_TIMER1;
121	clk_total += PCC_TIMER_CYCLES;
122	legacy_timer_tick(1);
123	local_irq_restore(flags);
124
125	return IRQ_HANDLED;
126}
127
128
129void mvme147_sched_init (void)
130{
131	if (request_irq(PCC_IRQ_TIMER1, mvme147_timer_int, IRQF_TIMER,
132			"timer 1", NULL))
133		pr_err("Couldn't register timer interrupt\n");
134
135	/* Init the clock with a value */
136	/* The clock counter increments until 0xFFFF then reloads */
137	m147_pcc->t1_preload = PCC_TIMER_PRELOAD;
138	m147_pcc->t1_cntrl = PCC_TIMER_CLR_OVF | PCC_TIMER_COC_EN |
139			     PCC_TIMER_TIC_EN;
140	m147_pcc->t1_int_cntrl = PCC_INT_ENAB | PCC_TIMER_INT_CLR |
141				 PCC_LEVEL_TIMER1;
142
143	clocksource_register_hz(&mvme147_clk, PCC_TIMER_CLOCK_FREQ);
144}
145
146static u64 mvme147_read_clk(struct clocksource *cs)
147{
148	unsigned long flags;
149	u8 overflow, tmp;
150	u16 count;
151	u32 ticks;
152
153	local_irq_save(flags);
154	tmp = m147_pcc->t1_cntrl >> 4;
155	count = m147_pcc->t1_count;
156	overflow = m147_pcc->t1_cntrl >> 4;
157	if (overflow != tmp)
158		count = m147_pcc->t1_count;
159	count -= PCC_TIMER_PRELOAD;
160	ticks = count + overflow * PCC_TIMER_CYCLES;
161	ticks += clk_total;
162	local_irq_restore(flags);
163
164	return ticks;
165}
166
167static int bcd2int (unsigned char b)
168{
169	return ((b>>4)*10 + (b&15));
170}
171
172int mvme147_hwclk(int op, struct rtc_time *t)
173{
174	if (!op) {
175		m147_rtc->ctrl = RTC_READ;
176		t->tm_year = bcd2int (m147_rtc->bcd_year);
177		t->tm_mon  = bcd2int(m147_rtc->bcd_mth) - 1;
178		t->tm_mday = bcd2int (m147_rtc->bcd_dom);
179		t->tm_hour = bcd2int (m147_rtc->bcd_hr);
180		t->tm_min  = bcd2int (m147_rtc->bcd_min);
181		t->tm_sec  = bcd2int (m147_rtc->bcd_sec);
182		m147_rtc->ctrl = 0;
183		if (t->tm_year < 70)
184			t->tm_year += 100;
185	} else {
186		/* FIXME Setting the time is not yet supported */
187		return -EOPNOTSUPP;
188	}
189	return 0;
190}
191