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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}
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/console.h>
21#include <linux/linkage.h>
22#include <linux/init.h>
23#include <linux/major.h>
24#include <linux/genhd.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/pgtable.h>
32#include <asm/setup.h>
33#include <asm/irq.h>
34#include <asm/traps.h>
35#include <asm/rtc.h>
36#include <asm/machdep.h>
37#include <asm/mvme147hw.h>
38
39
40static void mvme147_get_model(char *model);
41extern void mvme147_sched_init(irq_handler_t handler);
42extern u32 mvme147_gettimeoffset(void);
43extern int mvme147_hwclk (int, struct rtc_time *);
44extern int mvme147_set_clock_mmss (unsigned long);
45extern void mvme147_reset (void);
46
47
48static int bcd2int (unsigned char b);
49
50/* Save tick handler routine pointer, will point to xtime_update() in
51 * kernel/time/timekeeping.c, called via mvme147_process_int() */
52
53irq_handler_t tick_handler;
54
55
56int __init mvme147_parse_bootinfo(const struct bi_record *bi)
57{
58 uint16_t tag = be16_to_cpu(bi->tag);
59 if (tag == BI_VME_TYPE || tag == BI_VME_BRDINFO)
60 return 0;
61 else
62 return 1;
63}
64
65void mvme147_reset(void)
66{
67 printk ("\r\n\nCalled mvme147_reset\r\n");
68 m147_pcc->watchdog = 0x0a; /* Clear timer */
69 m147_pcc->watchdog = 0xa5; /* Enable watchdog - 100ms to reset */
70 while (1)
71 ;
72}
73
74static void mvme147_get_model(char *model)
75{
76 sprintf(model, "Motorola MVME147");
77}
78
79/*
80 * This function is called during kernel startup to initialize
81 * the mvme147 IRQ handling routines.
82 */
83
84void __init mvme147_init_IRQ(void)
85{
86 m68k_setup_user_interrupt(VEC_USER, 192);
87}
88
89void __init config_mvme147(void)
90{
91 mach_max_dma_address = 0x01000000;
92 mach_sched_init = mvme147_sched_init;
93 mach_init_IRQ = mvme147_init_IRQ;
94 arch_gettimeoffset = mvme147_gettimeoffset;
95 mach_hwclk = mvme147_hwclk;
96 mach_set_clock_mmss = mvme147_set_clock_mmss;
97 mach_reset = mvme147_reset;
98 mach_get_model = mvme147_get_model;
99
100 /* Board type is only set by newer versions of vmelilo/tftplilo */
101 if (!vme_brdtype)
102 vme_brdtype = VME_TYPE_MVME147;
103}
104
105
106/* Using pcc tick timer 1 */
107
108static irqreturn_t mvme147_timer_int (int irq, void *dev_id)
109{
110 m147_pcc->t1_int_cntrl = PCC_TIMER_INT_CLR;
111 m147_pcc->t1_int_cntrl = PCC_INT_ENAB|PCC_LEVEL_TIMER1;
112 return tick_handler(irq, dev_id);
113}
114
115
116void mvme147_sched_init (irq_handler_t timer_routine)
117{
118 tick_handler = timer_routine;
119 if (request_irq(PCC_IRQ_TIMER1, mvme147_timer_int, 0, "timer 1", NULL))
120 pr_err("Couldn't register timer interrupt\n");
121
122 /* Init the clock with a value */
123 /* our clock goes off every 6.25us */
124 m147_pcc->t1_preload = PCC_TIMER_PRELOAD;
125 m147_pcc->t1_cntrl = 0x0; /* clear timer */
126 m147_pcc->t1_cntrl = 0x3; /* start timer */
127 m147_pcc->t1_int_cntrl = PCC_TIMER_INT_CLR; /* clear pending ints */
128 m147_pcc->t1_int_cntrl = PCC_INT_ENAB|PCC_LEVEL_TIMER1;
129}
130
131/* This is always executed with interrupts disabled. */
132/* XXX There are race hazards in this code XXX */
133u32 mvme147_gettimeoffset(void)
134{
135 volatile unsigned short *cp = (volatile unsigned short *)0xfffe1012;
136 unsigned short n;
137
138 n = *cp;
139 while (n != *cp)
140 n = *cp;
141
142 n -= PCC_TIMER_PRELOAD;
143 return ((unsigned long)n * 25 / 4) * 1000;
144}
145
146static int bcd2int (unsigned char b)
147{
148 return ((b>>4)*10 + (b&15));
149}
150
151int mvme147_hwclk(int op, struct rtc_time *t)
152{
153#warning check me!
154 if (!op) {
155 m147_rtc->ctrl = RTC_READ;
156 t->tm_year = bcd2int (m147_rtc->bcd_year);
157 t->tm_mon = bcd2int (m147_rtc->bcd_mth);
158 t->tm_mday = bcd2int (m147_rtc->bcd_dom);
159 t->tm_hour = bcd2int (m147_rtc->bcd_hr);
160 t->tm_min = bcd2int (m147_rtc->bcd_min);
161 t->tm_sec = bcd2int (m147_rtc->bcd_sec);
162 m147_rtc->ctrl = 0;
163 }
164 return 0;
165}
166
167int mvme147_set_clock_mmss (unsigned long nowtime)
168{
169 return 0;
170}