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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/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 
 38 static void mvme147_get_model(char *model);
 39 extern void mvme147_sched_init(irq_handler_t handler);
 40 extern u32 mvme147_gettimeoffset(void);
 41 extern int mvme147_hwclk (int, struct rtc_time *);
 42 extern int mvme147_set_clock_mmss (unsigned long);
 43 extern void mvme147_reset (void);
 44 
 45 
 46 static 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 
 51 irq_handler_t tick_handler;
 52 
 53 
 54 int 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 
 62 void 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 
 71 static 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 
 81 void __init mvme147_init_IRQ(void)
 82 {
 83         m68k_setup_user_interrupt(VEC_USER, 192);
 84 }
 85 
 86 void __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         arch_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 
105 static 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 
113 void 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 */
130 u32 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) * 1000;
141 }
142 
143 static int bcd2int (unsigned char b)
144 {
145         return ((b>>4)*10 + (b&15));
146 }
147 
148 int 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 
164 int mvme147_set_clock_mmss (unsigned long nowtime)
165 {
166         return 0;
167 }
168 
169 /*-------------------  Serial console stuff ------------------------*/
170 
171 static 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 
180 static 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 
195 void 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 
210 void mvme147_init_console_port (struct console *co, int cflag)
211 {
212         co->write    = m147_scc_write;
213 }
214 

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