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Linux/arch/m68k/mvme147/config.c

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  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 xtime_update() in
 50  * kernel/time/timekeeping.c, called via mvme147_process_int() */
 51 
 52 irq_handler_t tick_handler;
 53 
 54 
 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 
 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 
 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 
 82 void __init mvme147_init_IRQ(void)
 83 {
 84         m68k_setup_user_interrupt(VEC_USER, 192);
 85 }
 86 
 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 
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 
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, 0, "timer 1", NULL))
118                 pr_err("Couldn't register timer interrupt\n");
119 
120         /* Init the clock with a value */
121         /* our clock goes off every 6.25us */
122         m147_pcc->t1_preload = PCC_TIMER_PRELOAD;
123         m147_pcc->t1_cntrl = 0x0;       /* clear timer */
124         m147_pcc->t1_cntrl = 0x3;       /* start timer */
125         m147_pcc->t1_int_cntrl = PCC_TIMER_INT_CLR;  /* clear pending ints */
126         m147_pcc->t1_int_cntrl = PCC_INT_ENAB|PCC_LEVEL_TIMER1;
127 }
128 
129 /* This is always executed with interrupts disabled.  */
130 /* XXX There are race hazards in this code XXX */
131 unsigned long mvme147_gettimeoffset (void)
132 {
133         volatile unsigned short *cp = (volatile unsigned short *)0xfffe1012;
134         unsigned short n;
135 
136         n = *cp;
137         while (n != *cp)
138                 n = *cp;
139 
140         n -= PCC_TIMER_PRELOAD;
141         return (unsigned long)n * 25 / 4;
142 }
143 
144 static int bcd2int (unsigned char b)
145 {
146         return ((b>>4)*10 + (b&15));
147 }
148 
149 int mvme147_hwclk(int op, struct rtc_time *t)
150 {
151 #warning check me!
152         if (!op) {
153                 m147_rtc->ctrl = RTC_READ;
154                 t->tm_year = bcd2int (m147_rtc->bcd_year);
155                 t->tm_mon  = bcd2int (m147_rtc->bcd_mth);
156                 t->tm_mday = bcd2int (m147_rtc->bcd_dom);
157                 t->tm_hour = bcd2int (m147_rtc->bcd_hr);
158                 t->tm_min  = bcd2int (m147_rtc->bcd_min);
159                 t->tm_sec  = bcd2int (m147_rtc->bcd_sec);
160                 m147_rtc->ctrl = 0;
161         }
162         return 0;
163 }
164 
165 int mvme147_set_clock_mmss (unsigned long nowtime)
166 {
167         return 0;
168 }
169 
170 /*-------------------  Serial console stuff ------------------------*/
171 
172 static void scc_delay (void)
173 {
174         int n;
175         volatile int trash;
176 
177         for (n = 0; n < 20; n++)
178                 trash = n;
179 }
180 
181 static void scc_write (char ch)
182 {
183         volatile char *p = (volatile char *)M147_SCC_A_ADDR;
184 
185         do {
186                 scc_delay();
187         }
188         while (!(*p & 4));
189         scc_delay();
190         *p = 8;
191         scc_delay();
192         *p = ch;
193 }
194 
195 
196 void m147_scc_write (struct console *co, const char *str, unsigned count)
197 {
198         unsigned long flags;
199 
200         local_irq_save(flags);
201 
202         while (count--)
203         {
204                 if (*str == '\n')
205                         scc_write ('\r');
206                 scc_write (*str++);
207         }
208         local_irq_restore(flags);
209 }
210 
211 void mvme147_init_console_port (struct console *co, int cflag)
212 {
213         co->write    = m147_scc_write;
214 }
215 

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