arch/m68k/bvme6000/config.c

   1 /*
   2  *  arch/m68k/bvme6000/config.c
   3  *
   4  *  Copyright (C) 1997 Richard Hirst [richard@sleepie.demon.co.uk]
   5  *
   6  * Based on:
   7  *
   8  *  linux/amiga/config.c
   9  *
  10  *  Copyright (C) 1993 Hamish Macdonald
  11  *
  12  * This file is subject to the terms and conditions of the GNU General Public
  13  * License.  See the file README.legal in the main directory of this archive
  14  * for more details.
  15  */
  16
  17 #include <linux/types.h>
  18 #include <linux/kernel.h>
  19 #include <linux/mm.h>
  20 #include <linux/tty.h>
  21 #include <linux/console.h>
  22 #include <linux/linkage.h>
  23 #include <linux/init.h>
  24 #include <linux/major.h>
  25 #include <linux/genhd.h>
  26 #include <linux/rtc.h>
  27 #include <linux/interrupt.h>
  28
  29 #include <asm/bootinfo.h>
  30 #include <asm/system.h>
  31 #include <asm/pgtable.h>
  32 #include <asm/setup.h>
  33 #include <asm/irq.h>
  34 #include <asm/traps.h>
  35 #include <asm/rtc.h>
  36 #include <asm/machdep.h>
  37 #include <asm/bvme6000hw.h>
  38
  39 extern irqreturn_t bvme6000_process_int (int level, struct pt_regs *regs);
  40 extern void bvme6000_init_IRQ (void);
  41 extern void bvme6000_free_irq (unsigned int, void *);
  42 extern int  show_bvme6000_interrupts(struct seq_file *, void *);
  43 extern void bvme6000_enable_irq (unsigned int);
  44 extern void bvme6000_disable_irq (unsigned int);
  45 static void bvme6000_get_model(char *model);
  46 static int  bvme6000_get_hardware_list(char *buffer);
  47 extern int  bvme6000_request_irq(unsigned int irq, irqreturn_t (*handler)(int, void *, struct pt_regs *), unsigned long flags, const char *devname, void *dev_id);
  48 extern void bvme6000_sched_init(irqreturn_t (*handler)(int, void *, struct pt_regs *));
  49 extern unsigned long bvme6000_gettimeoffset (void);
  50 extern int bvme6000_hwclk (int, struct rtc_time *);
  51 extern int bvme6000_set_clock_mmss (unsigned long);
  52 extern void bvme6000_reset (void);
  53 extern void bvme6000_waitbut(void);
  54 void bvme6000_set_vectors (void);
  55
  56 static unsigned char bcd2bin (unsigned char b);
  57 static unsigned char bin2bcd (unsigned char b);
  58
  59 /* Save tick handler routine pointer, will point to do_timer() in
  60  * kernel/sched.c, called via bvme6000_process_int() */
  61
  62 static irqreturn_t (*tick_handler)(int, void *, struct pt_regs *);
  63
  64
  65 int bvme6000_parse_bootinfo(const struct bi_record *bi)
  66 {
  67         if (bi->tag == BI_VME_TYPE)
  68                 return 0;
  69         else
  70                 return 1;
  71 }
  72
  73 void bvme6000_reset(void)
  74 {
  75         volatile PitRegsPtr pit = (PitRegsPtr)BVME_PIT_BASE;
  76
  77         printk ("\r\n\nCalled bvme6000_reset\r\n"
  78                         "\r\r\r\r\r\r\r\r\r\r\r\r\r\r\r\r\r\r");
  79         /* The string of returns is to delay the reset until the whole
  80          * message is output. */
  81         /* Enable the watchdog, via PIT port C bit 4 */
  82
  83         pit->pcddr      |= 0x10;        /* WDOG enable */
  84
  85         while(1)
  86                 ;
  87 }
  88
  89 static void bvme6000_get_model(char *model)
  90 {
  91     sprintf(model, "BVME%d000", m68k_cputype == CPU_68060 ? 6 : 4);
  92 }
  93
  94
  95 /* No hardware options on BVME6000? */
  96
  97 static int bvme6000_get_hardware_list(char *buffer)
  98 {
  99     *buffer = '\0';
 100     return 0;
 101 }
 102
 103
 104 void __init config_bvme6000(void)
 105 {
 106     volatile PitRegsPtr pit = (PitRegsPtr)BVME_PIT_BASE;
 107
 108     /* Board type is only set by newer versions of vmelilo/tftplilo */
 109     if (!vme_brdtype) {
 110         if (m68k_cputype == CPU_68060)
 111             vme_brdtype = VME_TYPE_BVME6000;
 112         else
 113             vme_brdtype = VME_TYPE_BVME4000;
 114     }
 115 #if 0
 116     /* Call bvme6000_set_vectors() so ABORT will work, along with BVMBug
 117      * debugger.  Note trap_init() will splat the abort vector, but
 118      * bvme6000_init_IRQ() will put it back again.  Hopefully. */
 119
 120     bvme6000_set_vectors();
 121 #endif
 122
 123     mach_max_dma_address = 0xffffffff;
 124     mach_sched_init      = bvme6000_sched_init;
 125     mach_init_IRQ        = bvme6000_init_IRQ;
 126     mach_gettimeoffset   = bvme6000_gettimeoffset;
 127     mach_hwclk           = bvme6000_hwclk;
 128     mach_set_clock_mmss  = bvme6000_set_clock_mmss;
 129     mach_reset           = bvme6000_reset;
 130     mach_free_irq        = bvme6000_free_irq;
 131     mach_process_int     = bvme6000_process_int;
 132     mach_get_irq_list    = show_bvme6000_interrupts;
 133     mach_request_irq     = bvme6000_request_irq;
 134     enable_irq           = bvme6000_enable_irq;
 135     disable_irq          = bvme6000_disable_irq;
 136     mach_get_model       = bvme6000_get_model;
 137     mach_get_hardware_list = bvme6000_get_hardware_list;
 138
 139     printk ("Board is %sconfigured as a System Controller\n",
 140                 *config_reg_ptr & BVME_CONFIG_SW1 ? "" : "not ");
 141
 142     /* Now do the PIT configuration */
 143
 144     pit->pgcr   = 0x00; /* Unidirectional 8 bit, no handshake for now */
 145     pit->psrr   = 0x18; /* PIACK and PIRQ fucntions enabled */
 146     pit->pacr   = 0x00; /* Sub Mode 00, H2 i/p, no DMA */
 147     pit->padr   = 0x00; /* Just to be tidy! */
 148     pit->paddr  = 0x00; /* All inputs for now (safest) */
 149     pit->pbcr   = 0x80; /* Sub Mode 1x, H4 i/p, no DMA */
 150     pit->pbdr   = 0xbc | (*config_reg_ptr & BVME_CONFIG_SW1 ? 0 : 0x40);
 151                         /* PRI, SYSCON?, Level3, SCC clks from xtal */
 152     pit->pbddr  = 0xf3; /* Mostly outputs */
 153     pit->pcdr   = 0x01; /* PA transceiver disabled */
 154     pit->pcddr  = 0x03; /* WDOG disable */
 155
 156     /* Disable snooping for Ethernet and VME accesses */
 157
 158     bvme_acr_addrctl = 0;
 159 }
 160
 161
 162 irqreturn_t bvme6000_abort_int (int irq, void *dev_id, struct pt_regs *fp)
 163 {
 164         unsigned long *new = (unsigned long *)vectors;
 165         unsigned long *old = (unsigned long *)0xf8000000;
 166
 167         /* Wait for button release */
 168         while (*(volatile unsigned char *)BVME_LOCAL_IRQ_STAT & BVME_ABORT_STATUS)
 169                 ;
 170
 171         *(new+4) = *(old+4);            /* Illegal instruction */
 172         *(new+9) = *(old+9);            /* Trace */
 173         *(new+47) = *(old+47);          /* Trap #15 */
 174         *(new+0x1f) = *(old+0x1f);      /* ABORT switch */
 175         return IRQ_HANDLED;
 176 }
 177
 178
 179 static irqreturn_t bvme6000_timer_int (int irq, void *dev_id, struct pt_regs *fp)
 180 {
 181     volatile RtcPtr_t rtc = (RtcPtr_t)BVME_RTC_BASE;
 182     unsigned char msr = rtc->msr & 0xc0;
 183
 184     rtc->msr = msr | 0x20;              /* Ack the interrupt */
 185
 186     return tick_handler(irq, dev_id, fp);
 187 }
 188
 189 /*
 190  * Set up the RTC timer 1 to mode 2, so T1 output toggles every 5ms
 191  * (40000 x 125ns).  It will interrupt every 10ms, when T1 goes low.
 192  * So, when reading the elapsed time, you should read timer1,
 193  * subtract it from 39999, and then add 40000 if T1 is high.
 194  * That gives you the number of 125ns ticks in to the 10ms period,
 195  * so divide by 8 to get the microsecond result.
 196  */
 197
 198 void bvme6000_sched_init (irqreturn_t (*timer_routine)(int, void *, struct pt_regs *))
 199 {
 200     volatile RtcPtr_t rtc = (RtcPtr_t)BVME_RTC_BASE;
 201     unsigned char msr = rtc->msr & 0xc0;
 202
 203     rtc->msr = 0;       /* Ensure timer registers accessible */
 204
 205     tick_handler = timer_routine;
 206     if (request_irq(BVME_IRQ_RTC, bvme6000_timer_int, 0,
 207                                 "timer", bvme6000_timer_int))
 208         panic ("Couldn't register timer int");
 209
 210     rtc->t1cr_omr = 0x04;       /* Mode 2, ext clk */
 211     rtc->t1msb = 39999 >> 8;
 212     rtc->t1lsb = 39999 & 0xff;
 213     rtc->irr_icr1 &= 0xef;      /* Route timer 1 to INTR pin */
 214     rtc->msr = 0x40;            /* Access int.cntrl, etc */
 215     rtc->pfr_icr0 = 0x80;       /* Just timer 1 ints enabled */
 216     rtc->irr_icr1 = 0;
 217     rtc->t1cr_omr = 0x0a;       /* INTR+T1 active lo, push-pull */
 218     rtc->t0cr_rtmr &= 0xdf;     /* Stop timers in standby */
 219     rtc->msr = 0;               /* Access timer 1 control */
 220     rtc->t1cr_omr = 0x05;       /* Mode 2, ext clk, GO */
 221
 222     rtc->msr = msr;
 223
 224     if (request_irq(BVME_IRQ_ABORT, bvme6000_abort_int, 0,
 225                                 "abort", bvme6000_abort_int))
 226         panic ("Couldn't register abort int");
 227 }
 228
 229
 230 /* This is always executed with interrupts disabled.  */
 231
 232 /*
 233  * NOTE:  Don't accept any readings within 5us of rollover, as
 234  * the T1INT bit may be a little slow getting set.  There is also
 235  * a fault in the chip, meaning that reads may produce invalid
 236  * results...
 237  */
 238
 239 unsigned long bvme6000_gettimeoffset (void)
 240 {
 241     volatile RtcPtr_t rtc = (RtcPtr_t)BVME_RTC_BASE;
 242     volatile PitRegsPtr pit = (PitRegsPtr)BVME_PIT_BASE;
 243     unsigned char msr = rtc->msr & 0xc0;
 244     unsigned char t1int, t1op;
 245     unsigned long v = 800000, ov;
 246
 247     rtc->msr = 0;       /* Ensure timer registers accessible */
 248
 249     do {
 250         ov = v;
 251         t1int = rtc->msr & 0x20;
 252         t1op  = pit->pcdr & 0x04;
 253         rtc->t1cr_omr |= 0x40;          /* Latch timer1 */
 254         v = rtc->t1msb << 8;            /* Read timer1 */
 255         v |= rtc->t1lsb;                /* Read timer1 */
 256     } while (t1int != (rtc->msr & 0x20) ||
 257                 t1op != (pit->pcdr & 0x04) ||
 258                         abs(ov-v) > 80 ||
 259                                 v > 39960);
 260
 261     v = 39999 - v;
 262     if (!t1op)                          /* If in second half cycle.. */
 263         v += 40000;
 264     v /= 8;                             /* Convert ticks to microseconds */
 265     if (t1int)
 266         v += 10000;                     /* Int pending, + 10ms */
 267     rtc->msr = msr;
 268
 269     return v;
 270 }
 271
 272 static unsigned char bcd2bin (unsigned char b)
 273 {
 274         return ((b>>4)*10 + (b&15));
 275 }
 276
 277 static unsigned char bin2bcd (unsigned char b)
 278 {
 279         return (((b/10)*16) + (b%10));
 280 }
 281
 282
 283 /*
 284  * Looks like op is non-zero for setting the clock, and zero for
 285  * reading the clock.
 286  *
 287  *  struct hwclk_time {
 288  *         unsigned        sec;       0..59
 289  *         unsigned        min;       0..59
 290  *         unsigned        hour;      0..23
 291  *         unsigned        day;       1..31
 292  *         unsigned        mon;       0..11
 293  *         unsigned        year;      00...
 294  *         int             wday;      0..6, 0 is Sunday, -1 means unknown/don't set
 295  * };
 296  */
 297
 298 int bvme6000_hwclk(int op, struct rtc_time *t)
 299 {
 300         volatile RtcPtr_t rtc = (RtcPtr_t)BVME_RTC_BASE;
 301         unsigned char msr = rtc->msr & 0xc0;
 302
 303         rtc->msr = 0x40;        /* Ensure clock and real-time-mode-register
 304                                  * are accessible */
 305         if (op)
 306         {       /* Write.... */
 307                 rtc->t0cr_rtmr = t->tm_year%4;
 308                 rtc->bcd_tenms = 0;
 309                 rtc->bcd_sec = bin2bcd(t->tm_sec);
 310                 rtc->bcd_min = bin2bcd(t->tm_min);
 311                 rtc->bcd_hr  = bin2bcd(t->tm_hour);
 312                 rtc->bcd_dom = bin2bcd(t->tm_mday);
 313                 rtc->bcd_mth = bin2bcd(t->tm_mon + 1);
 314                 rtc->bcd_year = bin2bcd(t->tm_year%100);
 315                 if (t->tm_wday >= 0)
 316                         rtc->bcd_dow = bin2bcd(t->tm_wday+1);
 317                 rtc->t0cr_rtmr = t->tm_year%4 | 0x08;
 318         }
 319         else
 320         {       /* Read....  */
 321                 do {
 322                         t->tm_sec  = bcd2bin(rtc->bcd_sec);
 323                         t->tm_min  = bcd2bin(rtc->bcd_min);
 324                         t->tm_hour = bcd2bin(rtc->bcd_hr);
 325                         t->tm_mday = bcd2bin(rtc->bcd_dom);
 326                         t->tm_mon  = bcd2bin(rtc->bcd_mth)-1;
 327                         t->tm_year = bcd2bin(rtc->bcd_year);
 328                         if (t->tm_year < 70)
 329                                 t->tm_year += 100;
 330                         t->tm_wday = bcd2bin(rtc->bcd_dow)-1;
 331                 } while (t->tm_sec != bcd2bin(rtc->bcd_sec));
 332         }
 333
 334         rtc->msr = msr;
 335
 336         return 0;
 337 }
 338
 339 /*
 340  * Set the minutes and seconds from seconds value 'nowtime'.  Fail if
 341  * clock is out by > 30 minutes.  Logic lifted from atari code.
 342  * Algorithm is to wait for the 10ms register to change, and then to
 343  * wait a short while, and then set it.
 344  */
 345
 346 int bvme6000_set_clock_mmss (unsigned long nowtime)
 347 {
 348         int retval = 0;
 349         short real_seconds = nowtime % 60, real_minutes = (nowtime / 60) % 60;
 350         unsigned char rtc_minutes, rtc_tenms;
 351         volatile RtcPtr_t rtc = (RtcPtr_t)BVME_RTC_BASE;
 352         unsigned char msr = rtc->msr & 0xc0;
 353         unsigned long flags;
 354         volatile int i;
 355
 356         rtc->msr = 0;           /* Ensure clock accessible */
 357         rtc_minutes = bcd2bin (rtc->bcd_min);
 358
 359         if ((rtc_minutes < real_minutes
 360                 ? real_minutes - rtc_minutes
 361                         : rtc_minutes - real_minutes) < 30)
 362         {
 363                 local_irq_save(flags);
 364                 rtc_tenms = rtc->bcd_tenms;
 365                 while (rtc_tenms == rtc->bcd_tenms)
 366                         ;
 367                 for (i = 0; i < 1000; i++)
 368                         ;
 369                 rtc->bcd_min = bin2bcd(real_minutes);
 370                 rtc->bcd_sec = bin2bcd(real_seconds);
 371                 local_irq_restore(flags);
 372         }
 373         else
 374                 retval = -1;
 375
 376         rtc->msr = msr;
 377
 378         return retval;
 379 }
 380