1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 *  arch/m68k/mvme147/config.c
4 *
5 *  Copyright (C) 1996 Dave Frascone [chaos@mindspring.com]
6 *  Cloned from        Richard Hirst [richard@sleepie.demon.co.uk]
7 *
8 * Based on:
9 *
10 *  Copyright (C) 1993 Hamish Macdonald
11 */
12
13#include <linux/types.h>
14#include <linux/kernel.h>
15#include <linux/mm.h>
16#include <linux/tty.h>
17#include <linux/clocksource.h>
18#include <linux/console.h>
19#include <linux/linkage.h>
20#include <linux/init.h>
21#include <linux/major.h>
22#include <linux/rtc.h>
23#include <linux/interrupt.h>
24
25#include <asm/bootinfo.h>
26#include <asm/bootinfo-vme.h>
27#include <asm/byteorder.h>
28#include <asm/setup.h>
29#include <asm/irq.h>
30#include <asm/traps.h>
31#include <asm/machdep.h>
32#include <asm/mvme147hw.h>
33#include <asm/config.h>
34
35
36static void mvme147_get_model(char *model);
37extern void mvme147_sched_init(void);
38extern int mvme147_hwclk (int, struct rtc_time *);
39extern void mvme147_reset (void);
40
41
42static int bcd2int (unsigned char b);
43
44
45int __init mvme147_parse_bootinfo(const struct bi_record *bi)
46{
47	uint16_t tag = be16_to_cpu(bi->tag);
48	if (tag == BI_VME_TYPE || tag == BI_VME_BRDINFO)
49		return 0;
50	else
51		return 1;
52}
53
54void mvme147_reset(void)
55{
56	pr_info("\r\n\nCalled mvme147_reset\r\n");
57	m147_pcc->watchdog = 0x0a;	/* Clear timer */
58	m147_pcc->watchdog = 0xa5;	/* Enable watchdog - 100ms to reset */
59	while (1)
60		;
61}
62
63static void mvme147_get_model(char *model)
64{
65	sprintf(model, "Motorola MVME147");
66}
67
68/*
69 * This function is called during kernel startup to initialize
70 * the mvme147 IRQ handling routines.
71 */
72
73static void __init mvme147_init_IRQ(void)
74{
75	m68k_setup_user_interrupt(VEC_USER, 192);
76}
77
78void __init config_mvme147(void)
79{
80	mach_sched_init		= mvme147_sched_init;
81	mach_init_IRQ		= mvme147_init_IRQ;
82	mach_hwclk		= mvme147_hwclk;
83	mach_reset		= mvme147_reset;
84	mach_get_model		= mvme147_get_model;
85
86	/* Board type is only set by newer versions of vmelilo/tftplilo */
87	if (!vme_brdtype)
88		vme_brdtype = VME_TYPE_MVME147;
89}
90
91static u64 mvme147_read_clk(struct clocksource *cs);
92
93static struct clocksource mvme147_clk = {
94	.name   = "pcc",
95	.rating = 250,
96	.read   = mvme147_read_clk,
97	.mask   = CLOCKSOURCE_MASK(32),
98	.flags  = CLOCK_SOURCE_IS_CONTINUOUS,
99};
100
101static u32 clk_total;
102
103#define PCC_TIMER_CLOCK_FREQ 160000
104#define PCC_TIMER_CYCLES     (PCC_TIMER_CLOCK_FREQ / HZ)
105#define PCC_TIMER_PRELOAD    (0x10000 - PCC_TIMER_CYCLES)
106
107/* Using pcc tick timer 1 */
108
109static irqreturn_t mvme147_timer_int (int irq, void *dev_id)
110{
111	unsigned long flags;
112
113	local_irq_save(flags);
114	m147_pcc->t1_cntrl = PCC_TIMER_CLR_OVF | PCC_TIMER_COC_EN |
115			     PCC_TIMER_TIC_EN;
116	m147_pcc->t1_int_cntrl = PCC_INT_ENAB | PCC_TIMER_INT_CLR |
117				 PCC_LEVEL_TIMER1;
118	clk_total += PCC_TIMER_CYCLES;
119	legacy_timer_tick(1);
120	local_irq_restore(flags);
121
122	return IRQ_HANDLED;
123}
124
125
126void mvme147_sched_init (void)
127{
128	if (request_irq(PCC_IRQ_TIMER1, mvme147_timer_int, IRQF_TIMER,
129			"timer 1", NULL))
130		pr_err("Couldn't register timer interrupt\n");
131
132	/* Init the clock with a value */
133	/* The clock counter increments until 0xFFFF then reloads */
134	m147_pcc->t1_preload = PCC_TIMER_PRELOAD;
135	m147_pcc->t1_cntrl = PCC_TIMER_CLR_OVF | PCC_TIMER_COC_EN |
136			     PCC_TIMER_TIC_EN;
137	m147_pcc->t1_int_cntrl = PCC_INT_ENAB | PCC_TIMER_INT_CLR |
138				 PCC_LEVEL_TIMER1;
139
140	clocksource_register_hz(&mvme147_clk, PCC_TIMER_CLOCK_FREQ);
141}
142
143static u64 mvme147_read_clk(struct clocksource *cs)
144{
145	unsigned long flags;
146	u8 overflow, tmp;
147	u16 count;
148	u32 ticks;
149
150	local_irq_save(flags);
151	tmp = m147_pcc->t1_cntrl >> 4;
152	count = m147_pcc->t1_count;
153	overflow = m147_pcc->t1_cntrl >> 4;
154	if (overflow != tmp)
155		count = m147_pcc->t1_count;
156	count -= PCC_TIMER_PRELOAD;
157	ticks = count + overflow * PCC_TIMER_CYCLES;
158	ticks += clk_total;
159	local_irq_restore(flags);
160
161	return ticks;
162}
163
164static int bcd2int (unsigned char b)
165{
166	return ((b>>4)*10 + (b&15));
167}
168
169int mvme147_hwclk(int op, struct rtc_time *t)
170{
171	if (!op) {
172		m147_rtc->ctrl = RTC_READ;
173		t->tm_year = bcd2int (m147_rtc->bcd_year);
174		t->tm_mon  = bcd2int(m147_rtc->bcd_mth) - 1;
175		t->tm_mday = bcd2int (m147_rtc->bcd_dom);
176		t->tm_hour = bcd2int (m147_rtc->bcd_hr);
177		t->tm_min  = bcd2int (m147_rtc->bcd_min);
178		t->tm_sec  = bcd2int (m147_rtc->bcd_sec);
179		m147_rtc->ctrl = 0;
180		if (t->tm_year < 70)
181			t->tm_year += 100;
182	} else {
183		/* FIXME Setting the time is not yet supported */
184		return -EOPNOTSUPP;
185	}
186	return 0;
187}
188