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
39 static void mvme147_get_model(char *model);
40 extern void mvme147_sched_init(void);
41 extern int mvme147_hwclk (int, struct rtc_time *);
42 extern void mvme147_reset (void);
43
44
45 static int bcd2int (unsigned char b);
46
47
mvme147_parse_bootinfo(const struct bi_record * bi)48 int __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
mvme147_reset(void)57 void 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
mvme147_get_model(char * model)66 static 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
mvme147_init_IRQ(void)76 void __init mvme147_init_IRQ(void)
77 {
78 m68k_setup_user_interrupt(VEC_USER, 192);
79 }
80
config_mvme147(void)81 void __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
94 static u64 mvme147_read_clk(struct clocksource *cs);
95
96 static 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
104 static 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
mvme147_timer_int(int irq,void * dev_id)112 static 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
mvme147_sched_init(void)129 void 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
mvme147_read_clk(struct clocksource * cs)146 static 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
bcd2int(unsigned char b)167 static int bcd2int (unsigned char b)
168 {
169 return ((b>>4)*10 + (b&15));
170 }
171
mvme147_hwclk(int op,struct rtc_time * t)172 int 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