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 #include "mvme147.h"
39
40 static void mvme147_get_model(char *model);
41 extern void mvme147_sched_init(void);
42 extern int mvme147_hwclk (int, struct rtc_time *);
43 extern void mvme147_reset (void);
44
45
46 static int bcd2int (unsigned char b);
47
48
mvme147_parse_bootinfo(const struct bi_record * bi)49 int __init mvme147_parse_bootinfo(const struct bi_record *bi)
50 {
51 uint16_t tag = be16_to_cpu(bi->tag);
52 if (tag == BI_VME_TYPE || tag == BI_VME_BRDINFO)
53 return 0;
54 else
55 return 1;
56 }
57
mvme147_reset(void)58 void mvme147_reset(void)
59 {
60 pr_info("\r\n\nCalled mvme147_reset\r\n");
61 m147_pcc->watchdog = 0x0a; /* Clear timer */
62 m147_pcc->watchdog = 0xa5; /* Enable watchdog - 100ms to reset */
63 while (1)
64 ;
65 }
66
mvme147_get_model(char * model)67 static void mvme147_get_model(char *model)
68 {
69 sprintf(model, "Motorola MVME147");
70 }
71
72 /*
73 * This function is called during kernel startup to initialize
74 * the mvme147 IRQ handling routines.
75 */
76
mvme147_init_IRQ(void)77 void __init mvme147_init_IRQ(void)
78 {
79 m68k_setup_user_interrupt(VEC_USER, 192);
80 }
81
config_mvme147(void)82 void __init config_mvme147(void)
83 {
84 mach_sched_init = mvme147_sched_init;
85 mach_init_IRQ = mvme147_init_IRQ;
86 mach_hwclk = mvme147_hwclk;
87 mach_reset = mvme147_reset;
88 mach_get_model = mvme147_get_model;
89
90 /* Board type is only set by newer versions of vmelilo/tftplilo */
91 if (!vme_brdtype)
92 vme_brdtype = VME_TYPE_MVME147;
93 }
94
95 static u64 mvme147_read_clk(struct clocksource *cs);
96
97 static struct clocksource mvme147_clk = {
98 .name = "pcc",
99 .rating = 250,
100 .read = mvme147_read_clk,
101 .mask = CLOCKSOURCE_MASK(32),
102 .flags = CLOCK_SOURCE_IS_CONTINUOUS,
103 };
104
105 static u32 clk_total;
106
107 #define PCC_TIMER_CLOCK_FREQ 160000
108 #define PCC_TIMER_CYCLES (PCC_TIMER_CLOCK_FREQ / HZ)
109 #define PCC_TIMER_PRELOAD (0x10000 - PCC_TIMER_CYCLES)
110
111 /* Using pcc tick timer 1 */
112
mvme147_timer_int(int irq,void * dev_id)113 static irqreturn_t mvme147_timer_int (int irq, void *dev_id)
114 {
115 unsigned long flags;
116
117 local_irq_save(flags);
118 m147_pcc->t1_cntrl = PCC_TIMER_CLR_OVF | PCC_TIMER_COC_EN |
119 PCC_TIMER_TIC_EN;
120 m147_pcc->t1_int_cntrl = PCC_INT_ENAB | PCC_TIMER_INT_CLR |
121 PCC_LEVEL_TIMER1;
122 clk_total += PCC_TIMER_CYCLES;
123 legacy_timer_tick(1);
124 local_irq_restore(flags);
125
126 return IRQ_HANDLED;
127 }
128
129
mvme147_sched_init(void)130 void mvme147_sched_init (void)
131 {
132 if (request_irq(PCC_IRQ_TIMER1, mvme147_timer_int, IRQF_TIMER,
133 "timer 1", NULL))
134 pr_err("Couldn't register timer interrupt\n");
135
136 /* Init the clock with a value */
137 /* The clock counter increments until 0xFFFF then reloads */
138 m147_pcc->t1_preload = PCC_TIMER_PRELOAD;
139 m147_pcc->t1_cntrl = PCC_TIMER_CLR_OVF | PCC_TIMER_COC_EN |
140 PCC_TIMER_TIC_EN;
141 m147_pcc->t1_int_cntrl = PCC_INT_ENAB | PCC_TIMER_INT_CLR |
142 PCC_LEVEL_TIMER1;
143
144 clocksource_register_hz(&mvme147_clk, PCC_TIMER_CLOCK_FREQ);
145 }
146
mvme147_read_clk(struct clocksource * cs)147 static u64 mvme147_read_clk(struct clocksource *cs)
148 {
149 unsigned long flags;
150 u8 overflow, tmp;
151 u16 count;
152 u32 ticks;
153
154 local_irq_save(flags);
155 tmp = m147_pcc->t1_cntrl >> 4;
156 count = m147_pcc->t1_count;
157 overflow = m147_pcc->t1_cntrl >> 4;
158 if (overflow != tmp)
159 count = m147_pcc->t1_count;
160 count -= PCC_TIMER_PRELOAD;
161 ticks = count + overflow * PCC_TIMER_CYCLES;
162 ticks += clk_total;
163 local_irq_restore(flags);
164
165 return ticks;
166 }
167
bcd2int(unsigned char b)168 static int bcd2int (unsigned char b)
169 {
170 return ((b>>4)*10 + (b&15));
171 }
172
mvme147_hwclk(int op,struct rtc_time * t)173 int mvme147_hwclk(int op, struct rtc_time *t)
174 {
175 if (!op) {
176 m147_rtc->ctrl = RTC_READ;
177 t->tm_year = bcd2int (m147_rtc->bcd_year);
178 t->tm_mon = bcd2int(m147_rtc->bcd_mth) - 1;
179 t->tm_mday = bcd2int (m147_rtc->bcd_dom);
180 t->tm_hour = bcd2int (m147_rtc->bcd_hr);
181 t->tm_min = bcd2int (m147_rtc->bcd_min);
182 t->tm_sec = bcd2int (m147_rtc->bcd_sec);
183 m147_rtc->ctrl = 0;
184 if (t->tm_year < 70)
185 t->tm_year += 100;
186 } else {
187 /* FIXME Setting the time is not yet supported */
188 return -EOPNOTSUPP;
189 }
190 return 0;
191 }
192
scc_delay(void)193 static void scc_delay(void)
194 {
195 __asm__ __volatile__ ("nop; nop;");
196 }
197
scc_write(char ch)198 static void scc_write(char ch)
199 {
200 do {
201 scc_delay();
202 } while (!(in_8(M147_SCC_A_ADDR) & BIT(2)));
203 scc_delay();
204 out_8(M147_SCC_A_ADDR, 8);
205 scc_delay();
206 out_8(M147_SCC_A_ADDR, ch);
207 }
208
mvme147_scc_write(struct console * co,const char * str,unsigned int count)209 void mvme147_scc_write(struct console *co, const char *str, unsigned int count)
210 {
211 unsigned long flags;
212
213 local_irq_save(flags);
214 while (count--) {
215 if (*str == '\n')
216 scc_write('\r');
217 scc_write(*str++);
218 }
219 local_irq_restore(flags);
220 }
221