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misc.c

/*
 * Miscellaneous Mac68K-specific stuff
 */

#include <linux/types.h>
#include <linux/errno.h>
#include <linux/miscdevice.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/time.h>
#include <linux/rtc.h>
#include <linux/mm.h>

#include <linux/adb.h>
#include <linux/cuda.h>
#include <linux/pmu.h>

#include <asm/uaccess.h>
#include <asm/io.h>
#include <asm/rtc.h>
#include <asm/system.h>
#include <asm/segment.h>
#include <asm/setup.h>
#include <asm/macintosh.h>
#include <asm/mac_via.h>
#include <asm/mac_oss.h>

#define BOOTINFO_COMPAT_1_0
#include <asm/bootinfo.h>
#include <asm/machdep.h>

/* Offset between Unix time (1970-based) and Mac time (1904-based) */

#define RTC_OFFSET 2082844800

extern struct mac_booter_data mac_bi_data;
static void (*rom_reset)(void);

#ifdef CONFIG_ADB_CUDA
static long cuda_read_time(void)
{
      struct adb_request req;
      long time;

      if (cuda_request(&req, NULL, 2, CUDA_PACKET, CUDA_GET_TIME) < 0)
            return 0;
      while (!req.complete)
            cuda_poll();

      time = (req.reply[3] << 24) | (req.reply[4] << 16)
            | (req.reply[5] << 8) | req.reply[6];
      return time - RTC_OFFSET;
}

static void cuda_write_time(long data)
{
      struct adb_request req;
      data += RTC_OFFSET;
      if (cuda_request(&req, NULL, 6, CUDA_PACKET, CUDA_SET_TIME,
                  (data >> 24) & 0xFF, (data >> 16) & 0xFF,
                  (data >> 8) & 0xFF, data & 0xFF) < 0)
            return;
      while (!req.complete)
            cuda_poll();
}

static __u8 cuda_read_pram(int offset)
{
      struct adb_request req;
      if (cuda_request(&req, NULL, 4, CUDA_PACKET, CUDA_GET_PRAM,
                  (offset >> 8) & 0xFF, offset & 0xFF) < 0)
            return 0;
      while (!req.complete)
            cuda_poll();
      return req.reply[3];
}

static void cuda_write_pram(int offset, __u8 data)
{
      struct adb_request req;
      if (cuda_request(&req, NULL, 5, CUDA_PACKET, CUDA_SET_PRAM,
                  (offset >> 8) & 0xFF, offset & 0xFF, data) < 0)
            return;
      while (!req.complete)
            cuda_poll();
}
#else
#define cuda_read_time() 0
#define cuda_write_time(n)
#define cuda_read_pram NULL
#define cuda_write_pram NULL
#endif

#ifdef CONFIG_ADB_PMU68K
static long pmu_read_time(void)
{
      struct adb_request req;
      long time;

      if (pmu_request(&req, NULL, 1, PMU_READ_RTC) < 0)
            return 0;
      while (!req.complete)
            pmu_poll();

      time = (req.reply[0] << 24) | (req.reply[1] << 16)
            | (req.reply[2] << 8) | req.reply[3];
      return time - RTC_OFFSET;
}

static void pmu_write_time(long data)
{
      struct adb_request req;
      data += RTC_OFFSET;
      if (pmu_request(&req, NULL, 5, PMU_SET_RTC,
                  (data >> 24) & 0xFF, (data >> 16) & 0xFF,
                  (data >> 8) & 0xFF, data & 0xFF) < 0)
            return;
      while (!req.complete)
            pmu_poll();
}

static __u8 pmu_read_pram(int offset)
{
      struct adb_request req;
      if (pmu_request(&req, NULL, 3, PMU_READ_NVRAM,
                  (offset >> 8) & 0xFF, offset & 0xFF) < 0)
            return 0;
      while (!req.complete)
            pmu_poll();
      return req.reply[3];
}

static void pmu_write_pram(int offset, __u8 data)
{
      struct adb_request req;
      if (pmu_request(&req, NULL, 4, PMU_WRITE_NVRAM,
                  (offset >> 8) & 0xFF, offset & 0xFF, data) < 0)
            return;
      while (!req.complete)
            pmu_poll();
}
#else
#define pmu_read_time() 0
#define pmu_write_time(n)
#define pmu_read_pram NULL
#define pmu_write_pram NULL
#endif

#ifdef CONFIG_ADB_MACIISI
extern int maciisi_request(struct adb_request *req,
                  void (*done)(struct adb_request *), int nbytes, ...);

static long maciisi_read_time(void)
{
      struct adb_request req;
      long time;

      if (maciisi_request(&req, NULL, 2, CUDA_PACKET, CUDA_GET_TIME))
            return 0;

      time = (req.reply[3] << 24) | (req.reply[4] << 16)
            | (req.reply[5] << 8) | req.reply[6];
      return time - RTC_OFFSET;
}

static void maciisi_write_time(long data)
{
      struct adb_request req;
      data += RTC_OFFSET;
      maciisi_request(&req, NULL, 6, CUDA_PACKET, CUDA_SET_TIME,
                  (data >> 24) & 0xFF, (data >> 16) & 0xFF,
                  (data >> 8) & 0xFF, data & 0xFF);
}

static __u8 maciisi_read_pram(int offset)
{
      struct adb_request req;
      if (maciisi_request(&req, NULL, 4, CUDA_PACKET, CUDA_GET_PRAM,
                  (offset >> 8) & 0xFF, offset & 0xFF))
            return 0;
      return req.reply[3];
}

static void maciisi_write_pram(int offset, __u8 data)
{
      struct adb_request req;
      maciisi_request(&req, NULL, 5, CUDA_PACKET, CUDA_SET_PRAM,
                  (offset >> 8) & 0xFF, offset & 0xFF, data);
}
#else
#define maciisi_read_time() 0
#define maciisi_write_time(n)
#define maciisi_read_pram NULL
#define maciisi_write_pram NULL
#endif

/*
 * VIA PRAM/RTC access routines
 *
 * Must be called with interrupts disabled and
 * the RTC should be enabled.
 */

static __u8 via_pram_readbyte(void)
{
      int   i,reg;
      __u8  data;

      reg = via1[vBufB] & ~VIA1B_vRTCClk;

      /* Set the RTC data line to be an input. */

      via1[vDirB] &= ~VIA1B_vRTCData;

      /* The bits of the byte come out in MSB order */

      data = 0;
      for (i = 0 ; i < 8 ; i++) {
            via1[vBufB] = reg;
            via1[vBufB] = reg | VIA1B_vRTCClk;
            data = (data << 1) | (via1[vBufB] & VIA1B_vRTCData);
      }

      /* Return RTC data line to output state */

      via1[vDirB] |= VIA1B_vRTCData;

      return data;
}

static void via_pram_writebyte(__u8 data)
{
      int   i,reg,bit;

      reg = via1[vBufB] & ~(VIA1B_vRTCClk | VIA1B_vRTCData);

      /* The bits of the byte go in in MSB order */

      for (i = 0 ; i < 8 ; i++) {
            bit = data & 0x80? 1 : 0;
            data <<= 1;
            via1[vBufB] = reg | bit;
            via1[vBufB] = reg | bit | VIA1B_vRTCClk;
      }
}

/*
 * Execute a VIA PRAM/RTC command. For read commands
 * data should point to a one-byte buffer for the
 * resulting data. For write commands it should point
 * to the data byte to for the command.
 *
 * This function disables all interrupts while running.
 */

static void via_pram_command(int command, __u8 *data)
{
      unsigned long flags;
      int   is_read;

      local_irq_save(flags);

      /* Enable the RTC and make sure the strobe line is high */

      via1[vBufB] = (via1[vBufB] | VIA1B_vRTCClk) & ~VIA1B_vRTCEnb;

      if (command & 0xFF00) {       /* extended (two-byte) command */
            via_pram_writebyte((command & 0xFF00) >> 8);
            via_pram_writebyte(command & 0xFF);
            is_read = command & 0x8000;
      } else {                /* one-byte command */
            via_pram_writebyte(command);
            is_read = command & 0x80;
      }
      if (is_read) {
            *data = via_pram_readbyte();
      } else {
            via_pram_writebyte(*data);
      }

      /* All done, disable the RTC */

      via1[vBufB] |= VIA1B_vRTCEnb;

      local_irq_restore(flags);
}

static __u8 via_read_pram(int offset)
{
      return 0;
}

static void via_write_pram(int offset, __u8 data)
{
}

/*
 * Return the current time in seconds since January 1, 1904.
 *
 * This only works on machines with the VIA-based PRAM/RTC, which
 * is basically any machine with Mac II-style ADB.
 */

static long via_read_time(void)
{
      union {
            __u8  cdata[4];
            long  idata;
      } result, last_result;
      int   ct;

      /*
       * The NetBSD guys say to loop until you get the same reading
       * twice in a row.
       */

      ct = 0;
      do {
            if (++ct > 10) {
                  printk("via_read_time: couldn't get valid time, "
                         "last read = 0x%08lx and 0x%08lx\n",
                         last_result.idata, result.idata);
                  break;
            }

            last_result.idata = result.idata;
            result.idata = 0;

            via_pram_command(0x81, &result.cdata[3]);
            via_pram_command(0x85, &result.cdata[2]);
            via_pram_command(0x89, &result.cdata[1]);
            via_pram_command(0x8D, &result.cdata[0]);
      } while (result.idata != last_result.idata);

      return result.idata - RTC_OFFSET;
}

/*
 * Set the current time to a number of seconds since January 1, 1904.
 *
 * This only works on machines with the VIA-based PRAM/RTC, which
 * is basically any machine with Mac II-style ADB.
 */

static void via_write_time(long time)
{
      union {
            __u8  cdata[4];
            long  idata;
      } data;
      __u8  temp;

      /* Clear the write protect bit */

      temp = 0x55;
      via_pram_command(0x35, &temp);

      data.idata = time + RTC_OFFSET;
      via_pram_command(0x01, &data.cdata[3]);
      via_pram_command(0x05, &data.cdata[2]);
      via_pram_command(0x09, &data.cdata[1]);
      via_pram_command(0x0D, &data.cdata[0]);

      /* Set the write protect bit */

      temp = 0xD5;
      via_pram_command(0x35, &temp);
}

static void via_shutdown(void)
{
      if (rbv_present) {
            via2[rBufB] &= ~0x04;
      } else {
            /* Direction of vDirB is output */
            via2[vDirB] |= 0x04;
            /* Send a value of 0 on that line */
            via2[vBufB] &= ~0x04;
            mdelay(1000);
      }
}

/*
 * FIXME: not sure how this is supposed to work exactly...
 */

static void oss_shutdown(void)
{
      oss->rom_ctrl = OSS_POWEROFF;
}

#ifdef CONFIG_ADB_CUDA

static void cuda_restart(void)
{
      struct adb_request req;
      if (cuda_request(&req, NULL, 2, CUDA_PACKET, CUDA_RESET_SYSTEM) < 0)
            return;
      while (!req.complete)
            cuda_poll();
}

static void cuda_shutdown(void)
{
      struct adb_request req;
      if (cuda_request(&req, NULL, 2, CUDA_PACKET, CUDA_POWERDOWN) < 0)
            return;
      while (!req.complete)
            cuda_poll();
}

#endif /* CONFIG_ADB_CUDA */

#ifdef CONFIG_ADB_PMU68K

void pmu_restart(void)
{
      struct adb_request req;
      if (pmu_request(&req, NULL,
                  2, PMU_SET_INTR_MASK, PMU_INT_ADB|PMU_INT_TICK) < 0)
            return;
      while (!req.complete)
            pmu_poll();
      if (pmu_request(&req, NULL, 1, PMU_RESET) < 0)
            return;
      while (!req.complete)
            pmu_poll();
}

void pmu_shutdown(void)
{
      struct adb_request req;
      if (pmu_request(&req, NULL,
                  2, PMU_SET_INTR_MASK, PMU_INT_ADB|PMU_INT_TICK) < 0)
            return;
      while (!req.complete)
            pmu_poll();
      if (pmu_request(&req, NULL, 5, PMU_SHUTDOWN, 'M', 'A', 'T', 'T') < 0)
            return;
      while (!req.complete)
            pmu_poll();
}

#endif

/*
 *-------------------------------------------------------------------
 * Below this point are the generic routines; they'll dispatch to the
 * correct routine for the hardware on which we're running.
 *-------------------------------------------------------------------
 */

void mac_pram_read(int offset, __u8 *buffer, int len)
{
      __u8 (*func)(int);
      int i;

      switch(macintosh_config->adb_type) {
      case MAC_ADB_IISI:
            func = maciisi_read_pram; break;
      case MAC_ADB_PB1:
      case MAC_ADB_PB2:
            func = pmu_read_pram; break;
      case MAC_ADB_CUDA:
            func = cuda_read_pram; break;
      default:
            func = via_read_pram;
      }
      if (!func)
            return;
      for (i = 0 ; i < len ; i++) {
            buffer[i] = (*func)(offset++);
      }
}

void mac_pram_write(int offset, __u8 *buffer, int len)
{
      void (*func)(int, __u8);
      int i;

      switch(macintosh_config->adb_type) {
      case MAC_ADB_IISI:
            func = maciisi_write_pram; break;
      case MAC_ADB_PB1:
      case MAC_ADB_PB2:
            func = pmu_write_pram; break;
      case MAC_ADB_CUDA:
            func = cuda_write_pram; break;
      default:
            func = via_write_pram;
      }
      if (!func)
            return;
      for (i = 0 ; i < len ; i++) {
            (*func)(offset++, buffer[i]);
      }
}

void mac_poweroff(void)
{
      /*
       * MAC_ADB_IISI may need to be moved up here if it doesn't actually
       * work using the ADB packet method.  --David Kilzer
       */

      if (oss_present) {
            oss_shutdown();
      } else if (macintosh_config->adb_type == MAC_ADB_II) {
            via_shutdown();
#ifdef CONFIG_ADB_CUDA
      } else if (macintosh_config->adb_type == MAC_ADB_CUDA) {
            cuda_shutdown();
#endif
#ifdef CONFIG_ADB_PMU68K
      } else if (macintosh_config->adb_type == MAC_ADB_PB1
            || macintosh_config->adb_type == MAC_ADB_PB2) {
            pmu_shutdown();
#endif
      }
      local_irq_enable();
      printk("It is now safe to turn off your Macintosh.\n");
      while(1);
}

void mac_reset(void)
{
      if (macintosh_config->adb_type == MAC_ADB_II) {
            unsigned long flags;

            /* need ROMBASE in booter */
            /* indeed, plus need to MAP THE ROM !! */

            if (mac_bi_data.rombase == 0)
                  mac_bi_data.rombase = 0x40800000;

            /* works on some */
            rom_reset = (void *) (mac_bi_data.rombase + 0xa);

            if (macintosh_config->ident == MAC_MODEL_SE30) {
                  /*
                   * MSch: Machines known to crash on ROM reset ...
                   */
            } else {
                  local_irq_save(flags);

                  rom_reset();

                  local_irq_restore(flags);
            }
#ifdef CONFIG_ADB_CUDA
      } else if (macintosh_config->adb_type == MAC_ADB_CUDA) {
            cuda_restart();
#endif
#ifdef CONFIG_ADB_PMU68K
      } else if (macintosh_config->adb_type == MAC_ADB_PB1
            || macintosh_config->adb_type == MAC_ADB_PB2) {
            pmu_restart();
#endif
      } else if (CPU_IS_030) {

            /* 030-specific reset routine.  The idea is general, but the
             * specific registers to reset are '030-specific.  Until I
             * have a non-030 machine, I can't test anything else.
             *  -- C. Scott Ananian <cananian@alumni.princeton.edu>
             */

            unsigned long rombase = 0x40000000;

            /* make a 1-to-1 mapping, using the transparent tran. reg. */
            unsigned long virt = (unsigned long) mac_reset;
            unsigned long phys = virt_to_phys(mac_reset);
            unsigned long addr = (phys&0xFF000000)|0x8777;
            unsigned long offset = phys-virt;
            local_irq_disable(); /* lets not screw this up, ok? */
            __asm__ __volatile__(".chip 68030\n\t"
                             "pmove %0,%/tt0\n\t"
                             ".chip 68k"
                             : : "m" (addr));
            /* Now jump to physical address so we can disable MMU */
            __asm__ __volatile__(
                    ".chip 68030\n\t"
                "lea %/pc@(1f),%/a0\n\t"
                "addl %0,%/a0\n\t"/* fixup target address and stack ptr */
                "addl %0,%/sp\n\t"
                "pflusha\n\t"
                "jmp %/a0@\n\t" /* jump into physical memory */
                "0:.long 0\n\t" /* a constant zero. */
                /* OK.  Now reset everything and jump to reset vector. */
                "1:\n\t"
                "lea %/pc@(0b),%/a0\n\t"
                "pmove %/a0@, %/tc\n\t" /* disable mmu */
                "pmove %/a0@, %/tt0\n\t" /* disable tt0 */
                "pmove %/a0@, %/tt1\n\t" /* disable tt1 */
                "movel #0, %/a0\n\t"
                "movec %/a0, %/vbr\n\t" /* clear vector base register */
                "movec %/a0, %/cacr\n\t" /* disable caches */
                "movel #0x0808,%/a0\n\t"
                "movec %/a0, %/cacr\n\t" /* flush i&d caches */
                "movew #0x2700,%/sr\n\t" /* set up status register */
                "movel %1@(0x0),%/a0\n\t"/* load interrupt stack pointer */
                "movec %/a0, %/isp\n\t"
                "movel %1@(0x4),%/a0\n\t" /* load reset vector */
                "reset\n\t" /* reset external devices */
                "jmp %/a0@\n\t" /* jump to the reset vector */
                ".chip 68k"
                : : "r" (offset), "a" (rombase) : "a0");
      }

      /* should never get here */
      local_irq_enable();
      printk ("Restart failed.  Please restart manually.\n");
      while(1);
}

/*
 * This function translates seconds since 1970 into a proper date.
 *
 * Algorithm cribbed from glibc2.1, __offtime().
 */
#define SECS_PER_MINUTE (60)
#define SECS_PER_HOUR  (SECS_PER_MINUTE * 60)
#define SECS_PER_DAY   (SECS_PER_HOUR * 24)

static void unmktime(unsigned long time, long offset,
                 int *yearp, int *monp, int *dayp,
                 int *hourp, int *minp, int *secp)
{
        /* How many days come before each month (0-12).  */
      static const unsigned short int __mon_yday[2][13] =
      {
            /* Normal years.  */
            { 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365 },
            /* Leap years.  */
            { 0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335, 366 }
      };
      long int days, rem, y, wday, yday;
      const unsigned short int *ip;

      days = time / SECS_PER_DAY;
      rem = time % SECS_PER_DAY;
      rem += offset;
      while (rem < 0) {
            rem += SECS_PER_DAY;
            --days;
      }
      while (rem >= SECS_PER_DAY) {
            rem -= SECS_PER_DAY;
            ++days;
      }
      *hourp = rem / SECS_PER_HOUR;
      rem %= SECS_PER_HOUR;
      *minp = rem / SECS_PER_MINUTE;
      *secp = rem % SECS_PER_MINUTE;
      /* January 1, 1970 was a Thursday. */
      wday = (4 + days) % 7; /* Day in the week. Not currently used */
      if (wday < 0) wday += 7;
      y = 1970;

#define DIV(a, b) ((a) / (b) - ((a) % (b) < 0))
#define LEAPS_THRU_END_OF(y) (DIV (y, 4) - DIV (y, 100) + DIV (y, 400))
#define __isleap(year)  \
  ((year) % 4 == 0 && ((year) % 100 != 0 || (year) % 400 == 0))

      while (days < 0 || days >= (__isleap (y) ? 366 : 365))
      {
            /* Guess a corrected year, assuming 365 days per year.  */
            long int yg = y + days / 365 - (days % 365 < 0);

            /* Adjust DAYS and Y to match the guessed year.  */
            days -= ((yg - y) * 365
                   + LEAPS_THRU_END_OF (yg - 1)
                   - LEAPS_THRU_END_OF (y - 1));
            y = yg;
      }
      *yearp = y - 1900;
      yday = days; /* day in the year.  Not currently used. */
      ip = __mon_yday[__isleap(y)];
      for (y = 11; days < (long int) ip[y]; --y)
            continue;
      days -= ip[y];
      *monp = y;
      *dayp = days + 1; /* day in the month */
      return;
}

/*
 * Read/write the hardware clock.
 */

int mac_hwclk(int op, struct rtc_time *t)
{
      unsigned long now;

      if (!op) { /* read */
            switch (macintosh_config->adb_type) {
            case MAC_ADB_II:
            case MAC_ADB_IOP:
                  now = via_read_time();
                  break;
            case MAC_ADB_IISI:
                  now = maciisi_read_time();
                  break;
            case MAC_ADB_PB1:
            case MAC_ADB_PB2:
                  now = pmu_read_time();
                  break;
            case MAC_ADB_CUDA:
                  now = cuda_read_time();
                  break;
            default:
                  now = 0;
            }

            t->tm_wday = 0;
            unmktime(now, 0,
                   &t->tm_year, &t->tm_mon, &t->tm_mday,
                   &t->tm_hour, &t->tm_min, &t->tm_sec);
            printk("mac_hwclk: read %04d-%02d-%-2d %02d:%02d:%02d\n",
                  t->tm_year + 1900, t->tm_mon + 1, t->tm_mday, t->tm_hour, t->tm_min, t->tm_sec);
      } else { /* write */
            printk("mac_hwclk: tried to write %04d-%02d-%-2d %02d:%02d:%02d\n",
                  t->tm_year + 1900, t->tm_mon + 1, t->tm_mday, t->tm_hour, t->tm_min, t->tm_sec);

#if 0 /* it trashes my rtc */
            now = mktime(t->tm_year + 1900, t->tm_mon + 1, t->tm_mday,
                       t->tm_hour, t->tm_min, t->tm_sec);

            switch (macintosh_config->adb_type) {
            case MAC_ADB_II:
            case MAC_ADB_IOP:
                  via_write_time(now);
                  break;
            case MAC_ADB_CUDA:
                  cuda_write_time(now);
                  break;
            case MAC_ADB_PB1:
            case MAC_ADB_PB2:
                  pmu_write_time(now);
                  break;
            case MAC_ADB_IISI:
                  maciisi_write_time(now);
            }
#endif
      }
      return 0;
}

/*
 * Set minutes/seconds in the hardware clock
 */

int mac_set_clock_mmss (unsigned long nowtime)
{
      struct rtc_time now;

      mac_hwclk(0, &now);
      now.tm_sec = nowtime % 60;
      now.tm_min = (nowtime / 60) % 60;
      mac_hwclk(1, &now);

      return 0;
}

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