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
36 static void mvme147_get_model(char *model);
37 extern void mvme147_sched_init(void);
38 extern int mvme147_hwclk (int, struct rtc_time *);
39 extern void mvme147_reset (void);
40
41
42 static int bcd2int (unsigned char b);
43
44
45 int __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
54 void 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
63 static 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
73 static void __init mvme147_init_IRQ(void)
74 {
75 m68k_setup_user_interrupt(VEC_USER, 192);
76 }
77
78 void __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
91 static u64 mvme147_read_clk(struct clocksource *cs);
92
93 static 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
101 static 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
109 static 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
126 void 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
143 static 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
164 static int bcd2int (unsigned char b)
165 {
166 return ((b>>4)*10 + (b&15));
167 }
168
169 int 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
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