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/system.h>
30 #include <asm/pgtable.h>
31 #include <asm/setup.h>
32 #include <asm/irq.h>
33 #include <asm/traps.h>
34 #include <asm/rtc.h>
35 #include <asm/machdep.h>
36 #include <asm/mvme147hw.h>
37
38
39 static void mvme147_get_model(char *model);
40 extern void mvme147_sched_init(irq_handler_t handler);
41 extern unsigned long mvme147_gettimeoffset (void);
42 extern int mvme147_hwclk (int, struct rtc_time *);
43 extern int mvme147_set_clock_mmss (unsigned long);
44 extern void mvme147_reset (void);
45
46
47 static int bcd2int (unsigned char b);
48
49 /* Save tick handler routine pointer, will point to do_timer() in
50 * kernel/sched.c, called via mvme147_process_int() */
51
52 irq_handler_t tick_handler;
53
54
mvme147_parse_bootinfo(const struct bi_record * bi)55 int mvme147_parse_bootinfo(const struct bi_record *bi)
56 {
57 if (bi->tag == BI_VME_TYPE || bi->tag == BI_VME_BRDINFO)
58 return 0;
59 else
60 return 1;
61 }
62
mvme147_reset(void)63 void mvme147_reset(void)
64 {
65 printk ("\r\n\nCalled mvme147_reset\r\n");
66 m147_pcc->watchdog = 0x0a; /* Clear timer */
67 m147_pcc->watchdog = 0xa5; /* Enable watchdog - 100ms to reset */
68 while (1)
69 ;
70 }
71
mvme147_get_model(char * model)72 static void mvme147_get_model(char *model)
73 {
74 sprintf(model, "Motorola MVME147");
75 }
76
77 /*
78 * This function is called during kernel startup to initialize
79 * the mvme147 IRQ handling routines.
80 */
81
mvme147_init_IRQ(void)82 void __init mvme147_init_IRQ(void)
83 {
84 m68k_setup_user_interrupt(VEC_USER, 192, NULL);
85 }
86
config_mvme147(void)87 void __init config_mvme147(void)
88 {
89 mach_max_dma_address = 0x01000000;
90 mach_sched_init = mvme147_sched_init;
91 mach_init_IRQ = mvme147_init_IRQ;
92 mach_gettimeoffset = mvme147_gettimeoffset;
93 mach_hwclk = mvme147_hwclk;
94 mach_set_clock_mmss = mvme147_set_clock_mmss;
95 mach_reset = mvme147_reset;
96 mach_get_model = mvme147_get_model;
97
98 /* Board type is only set by newer versions of vmelilo/tftplilo */
99 if (!vme_brdtype)
100 vme_brdtype = VME_TYPE_MVME147;
101 }
102
103
104 /* Using pcc tick timer 1 */
105
mvme147_timer_int(int irq,void * dev_id)106 static irqreturn_t mvme147_timer_int (int irq, void *dev_id)
107 {
108 m147_pcc->t1_int_cntrl = PCC_TIMER_INT_CLR;
109 m147_pcc->t1_int_cntrl = PCC_INT_ENAB|PCC_LEVEL_TIMER1;
110 return tick_handler(irq, dev_id);
111 }
112
113
mvme147_sched_init(irq_handler_t timer_routine)114 void mvme147_sched_init (irq_handler_t timer_routine)
115 {
116 tick_handler = timer_routine;
117 if (request_irq(PCC_IRQ_TIMER1, mvme147_timer_int, IRQ_FLG_REPLACE,
118 "timer 1", NULL))
119 pr_err("Couldn't register timer interrupt\n");
120
121 /* Init the clock with a value */
122 /* our clock goes off every 6.25us */
123 m147_pcc->t1_preload = PCC_TIMER_PRELOAD;
124 m147_pcc->t1_cntrl = 0x0; /* clear timer */
125 m147_pcc->t1_cntrl = 0x3; /* start timer */
126 m147_pcc->t1_int_cntrl = PCC_TIMER_INT_CLR; /* clear pending ints */
127 m147_pcc->t1_int_cntrl = PCC_INT_ENAB|PCC_LEVEL_TIMER1;
128 }
129
130 /* This is always executed with interrupts disabled. */
131 /* XXX There are race hazards in this code XXX */
mvme147_gettimeoffset(void)132 unsigned long mvme147_gettimeoffset (void)
133 {
134 volatile unsigned short *cp = (volatile unsigned short *)0xfffe1012;
135 unsigned short n;
136
137 n = *cp;
138 while (n != *cp)
139 n = *cp;
140
141 n -= PCC_TIMER_PRELOAD;
142 return (unsigned long)n * 25 / 4;
143 }
144
bcd2int(unsigned char b)145 static int bcd2int (unsigned char b)
146 {
147 return ((b>>4)*10 + (b&15));
148 }
149
mvme147_hwclk(int op,struct rtc_time * t)150 int mvme147_hwclk(int op, struct rtc_time *t)
151 {
152 #warning check me!
153 if (!op) {
154 m147_rtc->ctrl = RTC_READ;
155 t->tm_year = bcd2int (m147_rtc->bcd_year);
156 t->tm_mon = bcd2int (m147_rtc->bcd_mth);
157 t->tm_mday = bcd2int (m147_rtc->bcd_dom);
158 t->tm_hour = bcd2int (m147_rtc->bcd_hr);
159 t->tm_min = bcd2int (m147_rtc->bcd_min);
160 t->tm_sec = bcd2int (m147_rtc->bcd_sec);
161 m147_rtc->ctrl = 0;
162 }
163 return 0;
164 }
165
mvme147_set_clock_mmss(unsigned long nowtime)166 int mvme147_set_clock_mmss (unsigned long nowtime)
167 {
168 return 0;
169 }
170
171 /*------------------- Serial console stuff ------------------------*/
172
scc_delay(void)173 static void scc_delay (void)
174 {
175 int n;
176 volatile int trash;
177
178 for (n = 0; n < 20; n++)
179 trash = n;
180 }
181
scc_write(char ch)182 static void scc_write (char ch)
183 {
184 volatile char *p = (volatile char *)M147_SCC_A_ADDR;
185
186 do {
187 scc_delay();
188 }
189 while (!(*p & 4));
190 scc_delay();
191 *p = 8;
192 scc_delay();
193 *p = ch;
194 }
195
196
m147_scc_write(struct console * co,const char * str,unsigned count)197 void m147_scc_write (struct console *co, const char *str, unsigned count)
198 {
199 unsigned long flags;
200
201 local_irq_save(flags);
202
203 while (count--)
204 {
205 if (*str == '\n')
206 scc_write ('\r');
207 scc_write (*str++);
208 }
209 local_irq_restore(flags);
210 }
211
mvme147_init_console_port(struct console * co,int cflag)212 void mvme147_init_console_port (struct console *co, int cflag)
213 {
214 co->write = m147_scc_write;
215 }
216