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/arch/m68k/mvme147/config.c

https://bitbucket.org/evzijst/gittest
C | 229 lines | 166 code | 40 blank | 23 comment | 14 complexity | e917144253927793710119e8b01ac0cd MD5 | raw file
  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
 39extern irqreturn_t mvme147_process_int (int level, struct pt_regs *regs);
 40extern void mvme147_init_IRQ (void);
 41extern void mvme147_free_irq (unsigned int, void *);
 42extern int  show_mvme147_interrupts (struct seq_file *, void *);
 43extern void mvme147_enable_irq (unsigned int);
 44extern void mvme147_disable_irq (unsigned int);
 45static void mvme147_get_model(char *model);
 46static int  mvme147_get_hardware_list(char *buffer);
 47extern int mvme147_request_irq (unsigned int irq, irqreturn_t (*handler)(int, void *, struct pt_regs *), unsigned long flags, const char *devname, void *dev_id);
 48extern void mvme147_sched_init(irqreturn_t (*handler)(int, void *, struct pt_regs *));
 49extern unsigned long mvme147_gettimeoffset (void);
 50extern int mvme147_hwclk (int, struct rtc_time *);
 51extern int mvme147_set_clock_mmss (unsigned long);
 52extern void mvme147_reset (void);
 53extern void mvme147_waitbut(void);
 54
 55
 56static int bcd2int (unsigned char b);
 57
 58/* Save tick handler routine pointer, will point to do_timer() in
 59 * kernel/sched.c, called via mvme147_process_int() */
 60
 61irqreturn_t (*tick_handler)(int, void *, struct pt_regs *);
 62
 63
 64int mvme147_parse_bootinfo(const struct bi_record *bi)
 65{
 66	if (bi->tag == BI_VME_TYPE || bi->tag == BI_VME_BRDINFO)
 67		return 0;
 68	else
 69		return 1;
 70}
 71
 72void mvme147_reset(void)
 73{
 74	printk ("\r\n\nCalled mvme147_reset\r\n");
 75	m147_pcc->watchdog = 0x0a;	/* Clear timer */
 76	m147_pcc->watchdog = 0xa5;	/* Enable watchdog - 100ms to reset */
 77	while (1)
 78		;
 79}
 80
 81static void mvme147_get_model(char *model)
 82{
 83	sprintf(model, "Motorola MVME147");
 84}
 85
 86
 87static int mvme147_get_hardware_list(char *buffer)
 88{
 89	*buffer = '\0';
 90
 91	return 0;
 92}
 93
 94
 95void __init config_mvme147(void)
 96{
 97	mach_max_dma_address	= 0x01000000;
 98	mach_sched_init		= mvme147_sched_init;
 99	mach_init_IRQ		= mvme147_init_IRQ;
100	mach_gettimeoffset	= mvme147_gettimeoffset;
101	mach_hwclk		= mvme147_hwclk;
102	mach_set_clock_mmss	= mvme147_set_clock_mmss;
103	mach_reset		= mvme147_reset;
104	mach_free_irq		= mvme147_free_irq;
105	mach_process_int	= mvme147_process_int;
106	mach_get_irq_list	= show_mvme147_interrupts;
107	mach_request_irq	= mvme147_request_irq;
108	enable_irq		= mvme147_enable_irq;
109	disable_irq		= mvme147_disable_irq;
110	mach_get_model		= mvme147_get_model;
111	mach_get_hardware_list	= mvme147_get_hardware_list;
112
113	/* Board type is only set by newer versions of vmelilo/tftplilo */
114	if (!vme_brdtype)
115		vme_brdtype = VME_TYPE_MVME147;
116}
117
118
119/* Using pcc tick timer 1 */
120
121static irqreturn_t mvme147_timer_int (int irq, void *dev_id, struct pt_regs *fp)
122{
123	m147_pcc->t1_int_cntrl = PCC_TIMER_INT_CLR;
124	m147_pcc->t1_int_cntrl = PCC_INT_ENAB|PCC_LEVEL_TIMER1;
125	return tick_handler(irq, dev_id, fp);
126}
127
128
129void mvme147_sched_init (irqreturn_t (*timer_routine)(int, void *, struct pt_regs *))
130{
131	tick_handler = timer_routine;
132	request_irq (PCC_IRQ_TIMER1, mvme147_timer_int,
133		IRQ_FLG_REPLACE, "timer 1", NULL);
134
135	/* Init the clock with a value */
136	/* our clock goes off every 6.25us */
137	m147_pcc->t1_preload = PCC_TIMER_PRELOAD;
138	m147_pcc->t1_cntrl = 0x0;	/* clear timer */
139	m147_pcc->t1_cntrl = 0x3;	/* start timer */
140	m147_pcc->t1_int_cntrl = PCC_TIMER_INT_CLR;  /* clear pending ints */
141	m147_pcc->t1_int_cntrl = PCC_INT_ENAB|PCC_LEVEL_TIMER1;
142}
143
144/* This is always executed with interrupts disabled.  */
145/* XXX There are race hazards in this code XXX */
146unsigned long mvme147_gettimeoffset (void)
147{
148	volatile unsigned short *cp = (volatile unsigned short *)0xfffe1012;
149	unsigned short n;
150
151	n = *cp;
152	while (n != *cp)
153		n = *cp;
154
155	n -= PCC_TIMER_PRELOAD;
156	return (unsigned long)n * 25 / 4;
157}
158
159static int bcd2int (unsigned char b)
160{
161	return ((b>>4)*10 + (b&15));
162}
163
164int mvme147_hwclk(int op, struct rtc_time *t)
165{
166#warning check me!
167	if (!op) {
168		m147_rtc->ctrl = RTC_READ;
169		t->tm_year = bcd2int (m147_rtc->bcd_year);
170		t->tm_mon  = bcd2int (m147_rtc->bcd_mth);
171		t->tm_mday = bcd2int (m147_rtc->bcd_dom);
172		t->tm_hour = bcd2int (m147_rtc->bcd_hr);
173		t->tm_min  = bcd2int (m147_rtc->bcd_min);
174		t->tm_sec  = bcd2int (m147_rtc->bcd_sec);
175		m147_rtc->ctrl = 0;
176	}
177	return 0;
178}
179
180int mvme147_set_clock_mmss (unsigned long nowtime)
181{
182	return 0;
183}
184
185/*-------------------  Serial console stuff ------------------------*/
186
187static void scc_delay (void)
188{
189	int n;
190	volatile int trash;
191
192	for (n = 0; n < 20; n++)
193		trash = n;
194}
195
196static void scc_write (char ch)
197{
198	volatile char *p = (volatile char *)M147_SCC_A_ADDR;
199
200	do {
201		scc_delay();
202	}
203	while (!(*p & 4));
204	scc_delay();
205	*p = 8;
206	scc_delay();
207	*p = ch;
208}
209
210
211void m147_scc_write (struct console *co, const char *str, unsigned count)
212{
213	unsigned long flags;
214
215	local_irq_save(flags);
216
217	while (count--)
218	{
219		if (*str == '\n')
220			scc_write ('\r');
221		scc_write (*str++);
222	}
223	local_irq_restore(flags);
224}
225
226void mvme147_init_console_port (struct console *co, int cflag)
227{
228	co->write    = m147_scc_write;
229}