config.c revision 803f69144f0d48863c68f9d111b56849c7cef5bb 
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/pgtable.h>
30#include <asm/setup.h>
31#include <asm/irq.h>
32#include <asm/traps.h>
33#include <asm/rtc.h>
34#include <asm/machdep.h>
35#include <asm/mvme147hw.h>
36
37
38static void mvme147_get_model(char *model);
39extern void mvme147_sched_init(irq_handler_t handler);
40extern unsigned long mvme147_gettimeoffset (void);
41extern int mvme147_hwclk (int, struct rtc_time *);
42extern int mvme147_set_clock_mmss (unsigned long);
43extern void mvme147_reset (void);
44
45
46static int bcd2int (unsigned char b);
47
48/* Save tick handler routine pointer, will point to xtime_update() in
49 * kernel/time/timekeeping.c, called via mvme147_process_int() */
50
51irq_handler_t tick_handler;
52
53
54int mvme147_parse_bootinfo(const struct bi_record *bi)
55{
56	if (bi->tag == BI_VME_TYPE || bi->tag == BI_VME_BRDINFO)
57		return 0;
58	else
59		return 1;
60}
61
62void mvme147_reset(void)
63{
64	printk ("\r\n\nCalled mvme147_reset\r\n");
65	m147_pcc->watchdog = 0x0a;	/* Clear timer */
66	m147_pcc->watchdog = 0xa5;	/* Enable watchdog - 100ms to reset */
67	while (1)
68		;
69}
70
71static void mvme147_get_model(char *model)
72{
73	sprintf(model, "Motorola MVME147");
74}
75
76/*
77 * This function is called during kernel startup to initialize
78 * the mvme147 IRQ handling routines.
79 */
80
81void __init mvme147_init_IRQ(void)
82{
83	m68k_setup_user_interrupt(VEC_USER, 192);
84}
85
86void __init config_mvme147(void)
87{
88	mach_max_dma_address	= 0x01000000;
89	mach_sched_init		= mvme147_sched_init;
90	mach_init_IRQ		= mvme147_init_IRQ;
91	mach_gettimeoffset	= mvme147_gettimeoffset;
92	mach_hwclk		= mvme147_hwclk;
93	mach_set_clock_mmss	= mvme147_set_clock_mmss;
94	mach_reset		= mvme147_reset;
95	mach_get_model		= mvme147_get_model;
96
97	/* Board type is only set by newer versions of vmelilo/tftplilo */
98	if (!vme_brdtype)
99		vme_brdtype = VME_TYPE_MVME147;
100}
101
102
103/* Using pcc tick timer 1 */
104
105static irqreturn_t mvme147_timer_int (int irq, void *dev_id)
106{
107	m147_pcc->t1_int_cntrl = PCC_TIMER_INT_CLR;
108	m147_pcc->t1_int_cntrl = PCC_INT_ENAB|PCC_LEVEL_TIMER1;
109	return tick_handler(irq, dev_id);
110}
111
112
113void mvme147_sched_init (irq_handler_t timer_routine)
114{
115	tick_handler = timer_routine;
116	if (request_irq(PCC_IRQ_TIMER1, mvme147_timer_int, 0, "timer 1", NULL))
117		pr_err("Couldn't register timer interrupt\n");
118
119	/* Init the clock with a value */
120	/* our clock goes off every 6.25us */
121	m147_pcc->t1_preload = PCC_TIMER_PRELOAD;
122	m147_pcc->t1_cntrl = 0x0;	/* clear timer */
123	m147_pcc->t1_cntrl = 0x3;	/* start timer */
124	m147_pcc->t1_int_cntrl = PCC_TIMER_INT_CLR;  /* clear pending ints */
125	m147_pcc->t1_int_cntrl = PCC_INT_ENAB|PCC_LEVEL_TIMER1;
126}
127
128/* This is always executed with interrupts disabled.  */
129/* XXX There are race hazards in this code XXX */
130unsigned long mvme147_gettimeoffset (void)
131{
132	volatile unsigned short *cp = (volatile unsigned short *)0xfffe1012;
133	unsigned short n;
134
135	n = *cp;
136	while (n != *cp)
137		n = *cp;
138
139	n -= PCC_TIMER_PRELOAD;
140	return (unsigned long)n * 25 / 4;
141}
142
143static int bcd2int (unsigned char b)
144{
145	return ((b>>4)*10 + (b&15));
146}
147
148int mvme147_hwclk(int op, struct rtc_time *t)
149{
150#warning check me!
151	if (!op) {
152		m147_rtc->ctrl = RTC_READ;
153		t->tm_year = bcd2int (m147_rtc->bcd_year);
154		t->tm_mon  = bcd2int (m147_rtc->bcd_mth);
155		t->tm_mday = bcd2int (m147_rtc->bcd_dom);
156		t->tm_hour = bcd2int (m147_rtc->bcd_hr);
157		t->tm_min  = bcd2int (m147_rtc->bcd_min);
158		t->tm_sec  = bcd2int (m147_rtc->bcd_sec);
159		m147_rtc->ctrl = 0;
160	}
161	return 0;
162}
163
164int mvme147_set_clock_mmss (unsigned long nowtime)
165{
166	return 0;
167}
168
169/*-------------------  Serial console stuff ------------------------*/
170
171static void scc_delay (void)
172{
173	int n;
174	volatile int trash;
175
176	for (n = 0; n < 20; n++)
177		trash = n;
178}
179
180static void scc_write (char ch)
181{
182	volatile char *p = (volatile char *)M147_SCC_A_ADDR;
183
184	do {
185		scc_delay();
186	}
187	while (!(*p & 4));
188	scc_delay();
189	*p = 8;
190	scc_delay();
191	*p = ch;
192}
193
194
195void m147_scc_write (struct console *co, const char *str, unsigned count)
196{
197	unsigned long flags;
198
199	local_irq_save(flags);
200
201	while (count--)
202	{
203		if (*str == '\n')
204			scc_write ('\r');
205		scc_write (*str++);
206	}
207	local_irq_restore(flags);
208}
209
210void mvme147_init_console_port (struct console *co, int cflag)
211{
212	co->write    = m147_scc_write;
213}
214