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voyager_cat.c

/* -*- mode: c; c-basic-offset: 8 -*- */

/* Copyright (C) 1999,2001
 *
 * Author: J.E.J.Bottomley@HansenPartnership.com
 *
 * linux/arch/i386/kernel/voyager_cat.c
 *
 * This file contains all the logic for manipulating the CAT bus
 * in a level 5 machine.
 *
 * The CAT bus is a serial configuration and test bus.  Its primary
 * uses are to probe the initial configuration of the system and to
 * diagnose error conditions when a system interrupt occurs.  The low
 * level interface is fairly primitive, so most of this file consists
 * of bit shift manipulations to send and receive packets on the
 * serial bus */

#include <linux/types.h>
#include <linux/completion.h>
#include <linux/sched.h>
#include <asm/voyager.h>
#include <asm/vic.h>
#include <linux/ioport.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <asm/io.h>

#ifdef VOYAGER_CAT_DEBUG
#define CDEBUG(x) printk x
#else
#define CDEBUG(x)
#endif

/* the CAT command port */
#define CAT_CMD         (sspb + 0xe)
/* the CAT data port */
#define CAT_DATA  (sspb + 0xd)

/* the internal cat functions */
static void cat_pack(__u8 *msg, __u16 start_bit, __u8 *data, 
                 __u16 num_bits);
static void cat_unpack(__u8 *msg, __u16 start_bit, __u8 *data,
                   __u16 num_bits);
static void cat_build_header(__u8 *header, const __u16 len, 
                       const __u16 smallest_reg_bits,
                       const __u16 longest_reg_bits);
static int cat_sendinst(voyager_module_t *modp, voyager_asic_t *asicp,
                  __u8 reg, __u8 op);
static int cat_getdata(voyager_module_t *modp, voyager_asic_t *asicp,
                   __u8 reg, __u8 *value);
static int cat_shiftout(__u8 *data, __u16 data_bytes, __u16 header_bytes,
                  __u8 pad_bits);
static int cat_write(voyager_module_t *modp, voyager_asic_t *asicp, __u8 reg,
                 __u8 value);
static int cat_read(voyager_module_t *modp, voyager_asic_t *asicp, __u8 reg,
                __u8 *value);
static int cat_subread(voyager_module_t *modp, voyager_asic_t *asicp,
                   __u16 offset, __u16 len, void *buf);
static int cat_senddata(voyager_module_t *modp, voyager_asic_t *asicp,
                  __u8 reg, __u8 value);
static int cat_disconnect(voyager_module_t *modp, voyager_asic_t *asicp);
static int cat_connect(voyager_module_t *modp, voyager_asic_t *asicp);

static inline const char *
cat_module_name(int module_id)
{
      switch(module_id) {
      case 0x10:
            return "Processor Slot 0";
      case 0x11:
            return "Processor Slot 1";
      case 0x12:
            return "Processor Slot 2";
      case 0x13:
            return "Processor Slot 4";
      case 0x14:
            return "Memory Slot 0";
      case 0x15:
            return "Memory Slot 1";
      case 0x18:
            return "Primary Microchannel";
      case 0x19:
            return "Secondary Microchannel";
      case 0x1a:
            return "Power Supply Interface";
      case 0x1c:
            return "Processor Slot 5";
      case 0x1d:
            return "Processor Slot 6";
      case 0x1e:
            return "Processor Slot 7";
      case 0x1f:
            return "Processor Slot 8";
      default:
            return "Unknown Module";
      }
}

static int sspb = 0;          /* stores the super port location */
int voyager_8slot = 0;        /* set to true if a 51xx monster */

voyager_module_t *voyager_cat_list;

/* the I/O port assignments for the VIC and QIC */
static struct resource vic_res = {
      .name = "Voyager Interrupt Controller",
      .start      = 0xFC00,
      .end  = 0xFC6F
};
static struct resource qic_res = {
      .name = "Quad Interrupt Controller",
      .start      = 0xFC70,
      .end  = 0xFCFF
};

/* This function is used to pack a data bit stream inside a message.
 * It writes num_bits of the data buffer in msg starting at start_bit.
 * Note: This function assumes that any unused bit in the data stream
 * is set to zero so that the ors will work correctly */
static void
cat_pack(__u8 *msg, const __u16 start_bit, __u8 *data, const __u16 num_bits)
{
      /* compute initial shift needed */
      const __u16 offset = start_bit % BITS_PER_BYTE;
      __u16 len = num_bits / BITS_PER_BYTE;
      __u16 byte = start_bit / BITS_PER_BYTE;
      __u16 residue = (num_bits % BITS_PER_BYTE) + offset;
      int i;

      /* adjust if we have more than a byte of residue */
      if(residue >= BITS_PER_BYTE) {
            residue -= BITS_PER_BYTE;
            len++;
      }

      /* clear out the bits.  We assume here that if len==0 then
       * residue >= offset.  This is always true for the catbus
       * operations */
      msg[byte] &= 0xff << (BITS_PER_BYTE - offset); 
      msg[byte++] |= data[0] >> offset;
      if(len == 0)
            return;
      for(i = 1; i < len; i++)
            msg[byte++] = (data[i-1] << (BITS_PER_BYTE - offset))
                  | (data[i] >> offset);
      if(residue != 0) {
            __u8 mask = 0xff >> residue;
            __u8 last_byte = data[i-1] << (BITS_PER_BYTE - offset)
                  | (data[i] >> offset);
            
            last_byte &= ~mask;
            msg[byte] &= mask;
            msg[byte] |= last_byte;
      }
      return;
}
/* unpack the data again (same arguments as cat_pack()). data buffer
 * must be zero populated.
 *
 * Function: given a message string move to start_bit and copy num_bits into
 * data (starting at bit 0 in data).
 */
static void
cat_unpack(__u8 *msg, const __u16 start_bit, __u8 *data, const __u16 num_bits)
{
      /* compute initial shift needed */
      const __u16 offset = start_bit % BITS_PER_BYTE;
      __u16 len = num_bits / BITS_PER_BYTE;
      const __u8 last_bits = num_bits % BITS_PER_BYTE;
      __u16 byte = start_bit / BITS_PER_BYTE;
      int i;

      if(last_bits != 0)
            len++;

      /* special case: want < 8 bits from msg and we can get it from
       * a single byte of the msg */
      if(len == 0 && BITS_PER_BYTE - offset >= num_bits) {
            data[0] = msg[byte] << offset;
            data[0] &= 0xff >> (BITS_PER_BYTE - num_bits);
            return;
      }
      for(i = 0; i < len; i++) {
            /* this annoying if has to be done just in case a read of
             * msg one beyond the array causes a panic */
            if(offset != 0) {
                  data[i] = msg[byte++] << offset;
                  data[i] |= msg[byte] >> (BITS_PER_BYTE - offset);
            }
            else {
                  data[i] = msg[byte++];
            }
      }
      /* do we need to truncate the final byte */
      if(last_bits != 0) {
            data[i-1] &= 0xff << (BITS_PER_BYTE - last_bits);
      }
      return;
}

static void
cat_build_header(__u8 *header, const __u16 len, const __u16 smallest_reg_bits,
             const __u16 longest_reg_bits)
{
      int i;
      __u16 start_bit = (smallest_reg_bits - 1) % BITS_PER_BYTE;
      __u8 *last_byte = &header[len - 1];

      if(start_bit == 0)
            start_bit = 1;    /* must have at least one bit in the hdr */
      
      for(i=0; i < len; i++)
            header[i] = 0;

      for(i = start_bit; i > 0; i--)
            *last_byte = ((*last_byte) << 1) + 1;

}

static int
cat_sendinst(voyager_module_t *modp, voyager_asic_t *asicp, __u8 reg, __u8 op)
{
      __u8 parity, inst, inst_buf[4] = { 0 };
      __u8 iseq[VOYAGER_MAX_SCAN_PATH], hseq[VOYAGER_MAX_REG_SIZE];
      __u16 ibytes, hbytes, padbits;
      int i;
      
      /* 
       * Parity is the parity of the register number + 1 (READ_REGISTER
       * and WRITE_REGISTER always add '1' to the number of bits == 1)
       */
      parity = (__u8)(1 + (reg & 0x01) +
               ((__u8)(reg & 0x02) >> 1) +
               ((__u8)(reg & 0x04) >> 2) +
               ((__u8)(reg & 0x08) >> 3)) % 2;

      inst = ((parity << 7) | (reg << 2) | op);

      outb(VOYAGER_CAT_IRCYC, CAT_CMD);
      if(!modp->scan_path_connected) {
            if(asicp->asic_id != VOYAGER_CAT_ID) {
                  printk("**WARNING***: cat_sendinst has disconnected scan path not to CAT asic\n");
                  return 1;
            }
            outb(VOYAGER_CAT_HEADER, CAT_DATA);
            outb(inst, CAT_DATA);
            if(inb(CAT_DATA) != VOYAGER_CAT_HEADER) {
                  CDEBUG(("VOYAGER CAT: cat_sendinst failed to get CAT_HEADER\n"));
                  return 1;
            }
            return 0;
      }
      ibytes = modp->inst_bits / BITS_PER_BYTE;
      if((padbits = modp->inst_bits % BITS_PER_BYTE) != 0) {
            padbits = BITS_PER_BYTE - padbits;
            ibytes++;
      }
      hbytes = modp->largest_reg / BITS_PER_BYTE;
      if(modp->largest_reg % BITS_PER_BYTE)
            hbytes++;
      CDEBUG(("cat_sendinst: ibytes=%d, hbytes=%d\n", ibytes, hbytes));
      /* initialise the instruction sequence to 0xff */
      for(i=0; i < ibytes + hbytes; i++)
            iseq[i] = 0xff;
      cat_build_header(hseq, hbytes, modp->smallest_reg, modp->largest_reg);
      cat_pack(iseq, modp->inst_bits, hseq, hbytes * BITS_PER_BYTE);
      inst_buf[0] = inst;
      inst_buf[1] = 0xFF >> (modp->largest_reg % BITS_PER_BYTE);
      cat_pack(iseq, asicp->bit_location, inst_buf, asicp->ireg_length);
#ifdef VOYAGER_CAT_DEBUG
      printk("ins = 0x%x, iseq: ", inst);
      for(i=0; i< ibytes + hbytes; i++)
            printk("0x%x ", iseq[i]);
      printk("\n");
#endif
      if(cat_shiftout(iseq, ibytes, hbytes, padbits)) {
            CDEBUG(("VOYAGER CAT: cat_sendinst: cat_shiftout failed\n"));
            return 1;
      }
      CDEBUG(("CAT SHIFTOUT DONE\n"));
      return 0;
}

static int
cat_getdata(voyager_module_t *modp, voyager_asic_t *asicp, __u8 reg, 
          __u8 *value)
{
      if(!modp->scan_path_connected) {
            if(asicp->asic_id != VOYAGER_CAT_ID) {
                  CDEBUG(("VOYAGER CAT: ERROR: cat_getdata to CAT asic with scan path connected\n"));
                  return 1;
            }
            if(reg > VOYAGER_SUBADDRHI) 
                  outb(VOYAGER_CAT_RUN, CAT_CMD);
            outb(VOYAGER_CAT_DRCYC, CAT_CMD);
            outb(VOYAGER_CAT_HEADER, CAT_DATA);
            *value = inb(CAT_DATA);
            outb(0xAA, CAT_DATA);
            if(inb(CAT_DATA) != VOYAGER_CAT_HEADER) {
                  CDEBUG(("cat_getdata: failed to get VOYAGER_CAT_HEADER\n"));
                  return 1;
            }
            return 0;
      }
      else {
            __u16 sbits = modp->num_asics -1 + asicp->ireg_length;
            __u16 sbytes = sbits / BITS_PER_BYTE;
            __u16 tbytes;
            __u8 string[VOYAGER_MAX_SCAN_PATH], trailer[VOYAGER_MAX_REG_SIZE];
            __u8 padbits;
            int i;
            
            outb(VOYAGER_CAT_DRCYC, CAT_CMD);

            if((padbits = sbits % BITS_PER_BYTE) != 0) {
                  padbits = BITS_PER_BYTE - padbits;
                  sbytes++;
            }
            tbytes = asicp->ireg_length / BITS_PER_BYTE;
            if(asicp->ireg_length % BITS_PER_BYTE)
                  tbytes++;
            CDEBUG(("cat_getdata: tbytes = %d, sbytes = %d, padbits = %d\n",
                  tbytes,     sbytes, padbits));
            cat_build_header(trailer, tbytes, 1, asicp->ireg_length);

            
            for(i = tbytes - 1; i >= 0; i--) {
                  outb(trailer[i], CAT_DATA);
                  string[sbytes + i] = inb(CAT_DATA);
            }

            for(i = sbytes - 1; i >= 0; i--) {
                  outb(0xaa, CAT_DATA);
                  string[i] = inb(CAT_DATA);
            }
            *value = 0;
            cat_unpack(string, padbits + (tbytes * BITS_PER_BYTE) + asicp->asic_location, value, asicp->ireg_length);
#ifdef VOYAGER_CAT_DEBUG
            printk("value=0x%x, string: ", *value);
            for(i=0; i< tbytes+sbytes; i++)
                  printk("0x%x ", string[i]);
            printk("\n");
#endif
            
            /* sanity check the rest of the return */
            for(i=0; i < tbytes; i++) {
                  __u8 input = 0;

                  cat_unpack(string, padbits + (i * BITS_PER_BYTE), &input, BITS_PER_BYTE);
                  if(trailer[i] != input) {
                        CDEBUG(("cat_getdata: failed to sanity check rest of ret(%d) 0x%x != 0x%x\n", i, input, trailer[i]));
                        return 1;
                  }
            }
            CDEBUG(("cat_getdata DONE\n"));
            return 0;
      }
}

static int
cat_shiftout(__u8 *data, __u16 data_bytes, __u16 header_bytes, __u8 pad_bits)
{
      int i;
      
      for(i = data_bytes + header_bytes - 1; i >= header_bytes; i--)
            outb(data[i], CAT_DATA);

      for(i = header_bytes - 1; i >= 0; i--) {
            __u8 header = 0;
            __u8 input;

            outb(data[i], CAT_DATA);
            input = inb(CAT_DATA);
            CDEBUG(("cat_shiftout: returned 0x%x\n", input));
            cat_unpack(data, ((data_bytes + i) * BITS_PER_BYTE) - pad_bits,
                     &header, BITS_PER_BYTE);
            if(input != header) {
                  CDEBUG(("VOYAGER CAT: cat_shiftout failed to return header 0x%x != 0x%x\n", input, header));
                  return 1;
            }
      }
      return 0;
}

static int
cat_senddata(voyager_module_t *modp, voyager_asic_t *asicp, 
           __u8 reg, __u8 value)
{
      outb(VOYAGER_CAT_DRCYC, CAT_CMD);
      if(!modp->scan_path_connected) {
            if(asicp->asic_id != VOYAGER_CAT_ID) {
                  CDEBUG(("VOYAGER CAT: ERROR: scan path disconnected when asic != CAT\n"));
                  return 1;
            }
            outb(VOYAGER_CAT_HEADER, CAT_DATA);
            outb(value, CAT_DATA);
            if(inb(CAT_DATA) != VOYAGER_CAT_HEADER) {
                  CDEBUG(("cat_senddata: failed to get correct header response to sent data\n"));
                  return 1;
            }
            if(reg > VOYAGER_SUBADDRHI) {
                  outb(VOYAGER_CAT_RUN, CAT_CMD);
                  outb(VOYAGER_CAT_END, CAT_CMD);
                  outb(VOYAGER_CAT_RUN, CAT_CMD);
            }
            
            return 0;
      }
      else {
            __u16 hbytes = asicp->ireg_length / BITS_PER_BYTE;
            __u16 dbytes = (modp->num_asics - 1 + asicp->ireg_length)/BITS_PER_BYTE;
            __u8 padbits, dseq[VOYAGER_MAX_SCAN_PATH], 
                  hseq[VOYAGER_MAX_REG_SIZE];
            int i;

            if((padbits = (modp->num_asics - 1 
                         + asicp->ireg_length) % BITS_PER_BYTE) != 0) {
                  padbits = BITS_PER_BYTE - padbits;
                  dbytes++;
            }
            if(asicp->ireg_length % BITS_PER_BYTE)
                  hbytes++;
            
            cat_build_header(hseq, hbytes, 1, asicp->ireg_length);
            
            for(i = 0; i < dbytes + hbytes; i++)
                  dseq[i] = 0xff;
            CDEBUG(("cat_senddata: dbytes=%d, hbytes=%d, padbits=%d\n",
                  dbytes, hbytes, padbits));
            cat_pack(dseq, modp->num_asics - 1 + asicp->ireg_length,
                   hseq, hbytes * BITS_PER_BYTE);
            cat_pack(dseq, asicp->asic_location, &value, 
                   asicp->ireg_length);
#ifdef VOYAGER_CAT_DEBUG
            printk("dseq ");
            for(i=0; i<hbytes+dbytes; i++) {
                  printk("0x%x ", dseq[i]);
            }
            printk("\n");
#endif
            return cat_shiftout(dseq, dbytes, hbytes, padbits);
      }
}

static int
cat_write(voyager_module_t *modp, voyager_asic_t *asicp, __u8 reg,
       __u8 value)
{
      if(cat_sendinst(modp, asicp, reg, VOYAGER_WRITE_CONFIG))
            return 1;
      return cat_senddata(modp, asicp, reg, value);
}

static int
cat_read(voyager_module_t *modp, voyager_asic_t *asicp, __u8 reg,
       __u8 *value)
{
      if(cat_sendinst(modp, asicp, reg, VOYAGER_READ_CONFIG))
            return 1;
      return cat_getdata(modp, asicp, reg, value);
}

static int
cat_subaddrsetup(voyager_module_t *modp, voyager_asic_t *asicp, __u16 offset,
             __u16 len)
{
      __u8 val;

      if(len > 1) {
            /* set auto increment */
            __u8 newval;
            
            if(cat_read(modp, asicp, VOYAGER_AUTO_INC_REG, &val)) {
                  CDEBUG(("cat_subaddrsetup: read of VOYAGER_AUTO_INC_REG failed\n"));
                  return 1;
            }
            CDEBUG(("cat_subaddrsetup: VOYAGER_AUTO_INC_REG = 0x%x\n", val));
            newval = val | VOYAGER_AUTO_INC;
            if(newval != val) {
                  if(cat_write(modp, asicp, VOYAGER_AUTO_INC_REG, val)) {
                        CDEBUG(("cat_subaddrsetup: write to VOYAGER_AUTO_INC_REG failed\n"));
                        return 1;
                  }
            }
      }
      if(cat_write(modp, asicp, VOYAGER_SUBADDRLO, (__u8)(offset &0xff))) {
            CDEBUG(("cat_subaddrsetup: write to SUBADDRLO failed\n"));
            return 1;
      }
      if(asicp->subaddr > VOYAGER_SUBADDR_LO) {
            if(cat_write(modp, asicp, VOYAGER_SUBADDRHI, (__u8)(offset >> 8))) {
                  CDEBUG(("cat_subaddrsetup: write to SUBADDRHI failed\n"));
                  return 1;
            }
            cat_read(modp, asicp, VOYAGER_SUBADDRHI, &val);
            CDEBUG(("cat_subaddrsetup: offset = %d, hi = %d\n", offset, val));
      }
      cat_read(modp, asicp, VOYAGER_SUBADDRLO, &val);
      CDEBUG(("cat_subaddrsetup: offset = %d, lo = %d\n", offset, val));
      return 0;
}
            
static int
cat_subwrite(voyager_module_t *modp, voyager_asic_t *asicp, __u16 offset,
          __u16 len, void *buf)
{
      int i, retval;

      /* FIXME: need special actions for VOYAGER_CAT_ID here */
      if(asicp->asic_id == VOYAGER_CAT_ID) {
            CDEBUG(("cat_subwrite: ATTEMPT TO WRITE TO CAT ASIC\n"));
            /* FIXME -- This is supposed to be handled better
             * There is a problem writing to the cat asic in the
             * PSI.  The 30us delay seems to work, though */
            udelay(30);
      }
            
      if((retval = cat_subaddrsetup(modp, asicp, offset, len)) != 0) {
            printk("cat_subwrite: cat_subaddrsetup FAILED\n");
            return retval;
      }
      
      if(cat_sendinst(modp, asicp, VOYAGER_SUBADDRDATA, VOYAGER_WRITE_CONFIG)) {
            printk("cat_subwrite: cat_sendinst FAILED\n");
            return 1;
      }
      for(i = 0; i < len; i++) {
            if(cat_senddata(modp, asicp, 0xFF, ((__u8 *)buf)[i])) {
                  printk("cat_subwrite: cat_sendata element at %d FAILED\n", i);
                  return 1;
            }
      }
      return 0;
}
static int
cat_subread(voyager_module_t *modp, voyager_asic_t *asicp, __u16 offset,
          __u16 len, void *buf)
{
      int i, retval;

      if((retval = cat_subaddrsetup(modp, asicp, offset, len)) != 0) {
            CDEBUG(("cat_subread: cat_subaddrsetup FAILED\n"));
            return retval;
      }

      if(cat_sendinst(modp, asicp, VOYAGER_SUBADDRDATA, VOYAGER_READ_CONFIG)) {
            CDEBUG(("cat_subread: cat_sendinst failed\n"));
            return 1;
      }
      for(i = 0; i < len; i++) {
            if(cat_getdata(modp, asicp, 0xFF,
                         &((__u8 *)buf)[i])) {
                  CDEBUG(("cat_subread: cat_getdata element %d failed\n", i));
                  return 1;
            }
      }
      return 0;
}


/* buffer for storing EPROM data read in during initialisation */
static __initdata __u8 eprom_buf[0xFFFF];
static voyager_module_t *voyager_initial_module;

/* Initialise the cat bus components.  We assume this is called by the
 * boot cpu *after* all memory initialisation has been done (so we can
 * use kmalloc) but before smp initialisation, so we can probe the SMP
 * configuration and pick up necessary information.  */
void __init
voyager_cat_init(void)
{
      voyager_module_t **modpp = &voyager_initial_module;
      voyager_asic_t **asicpp;
      voyager_asic_t *qabc_asic = NULL;
      int i, j;
      unsigned long qic_addr = 0;
      __u8 qabc_data[0x20];
      __u8 num_submodules, val;
      voyager_eprom_hdr_t *eprom_hdr = (voyager_eprom_hdr_t *)&eprom_buf[0];
      
      __u8 cmos[4];
      unsigned long addr;
      
      /* initiallise the SUS mailbox */
      for(i=0; i<sizeof(cmos); i++)
            cmos[i] = voyager_extended_cmos_read(VOYAGER_DUMP_LOCATION + i);
      addr = *(unsigned long *)cmos;
      if((addr & 0xff000000) != 0xff000000) {
            printk(KERN_ERR "Voyager failed to get SUS mailbox (addr = 0x%lx\n", addr);
      } else {
            static struct resource res;
            
            res.name = "voyager SUS";
            res.start = addr;
            res.end = addr+0x3ff;
            
            request_resource(&iomem_resource, &res);
            voyager_SUS = (struct voyager_SUS *)
                  ioremap(addr, 0x400);
            printk(KERN_NOTICE "Voyager SUS mailbox version 0x%x\n",
                   voyager_SUS->SUS_version);
            voyager_SUS->kernel_version = VOYAGER_MAILBOX_VERSION;
            voyager_SUS->kernel_flags = VOYAGER_OS_HAS_SYSINT;
      }

      /* clear the processor counts */
      voyager_extended_vic_processors = 0;
      voyager_quad_processors = 0;



      printk("VOYAGER: beginning CAT bus probe\n");
      /* set up the SuperSet Port Block which tells us where the
       * CAT communication port is */
      sspb = inb(VOYAGER_SSPB_RELOCATION_PORT) * 0x100;
      VDEBUG(("VOYAGER DEBUG: sspb = 0x%x\n", sspb));

      /* now find out if were 8 slot or normal */
      if((inb(VIC_PROC_WHO_AM_I) & EIGHT_SLOT_IDENTIFIER)
         == EIGHT_SLOT_IDENTIFIER) {
            voyager_8slot = 1;
            printk(KERN_NOTICE "Voyager: Eight slot 51xx configuration detected\n");
      }

      for(i = VOYAGER_MIN_MODULE;
          i <= VOYAGER_MAX_MODULE; i++) {
            __u8 input;
            int asic;
            __u16 eprom_size;
            __u16 sp_offset;

            outb(VOYAGER_CAT_DESELECT, VOYAGER_CAT_CONFIG_PORT);
            outb(i, VOYAGER_CAT_CONFIG_PORT);

            /* check the presence of the module */
            outb(VOYAGER_CAT_RUN, CAT_CMD);
            outb(VOYAGER_CAT_IRCYC, CAT_CMD);
            outb(VOYAGER_CAT_HEADER, CAT_DATA);
            /* stream series of alternating 1's and 0's to stimulate
             * response */
            outb(0xAA, CAT_DATA);
            input = inb(CAT_DATA);
            outb(VOYAGER_CAT_END, CAT_CMD);
            if(input != VOYAGER_CAT_HEADER) {
                  continue;
            }
            CDEBUG(("VOYAGER DEBUG: found module id 0x%x, %s\n", i,
                  cat_module_name(i)));
            *modpp = kmalloc(sizeof(voyager_module_t), GFP_KERNEL); /*&voyager_module_storage[cat_count++];*/
            if(*modpp == NULL) {
                  printk("**WARNING** kmalloc failure in cat_init\n");
                  continue;
            }
            memset(*modpp, 0, sizeof(voyager_module_t));
            /* need temporary asic for cat_subread.  It will be
             * filled in correctly later */
            (*modpp)->asic = kmalloc(sizeof(voyager_asic_t), GFP_KERNEL); /*&voyager_asic_storage[asic_count];*/
            if((*modpp)->asic == NULL) {
                  printk("**WARNING** kmalloc failure in cat_init\n");
                  continue;
            }
            memset((*modpp)->asic, 0, sizeof(voyager_asic_t));
            (*modpp)->asic->asic_id = VOYAGER_CAT_ID;
            (*modpp)->asic->subaddr = VOYAGER_SUBADDR_HI;
            (*modpp)->module_addr = i;
            (*modpp)->scan_path_connected = 0;
            if(i == VOYAGER_PSI) {
                  /* Exception leg for modules with no EEPROM */
                  printk("Module \"%s\"\n", cat_module_name(i));
                  continue;
            }
                         
            CDEBUG(("cat_init: Reading eeprom for module 0x%x at offset %d\n", i, VOYAGER_XSUM_END_OFFSET));
            outb(VOYAGER_CAT_RUN, CAT_CMD);
            cat_disconnect(*modpp, (*modpp)->asic);
            if(cat_subread(*modpp, (*modpp)->asic,
                         VOYAGER_XSUM_END_OFFSET, sizeof(eprom_size),
                         &eprom_size)) {
                  printk("**WARNING**: Voyager couldn't read EPROM size for module 0x%x\n", i);
                  outb(VOYAGER_CAT_END, CAT_CMD);
                  continue;
            }
            if(eprom_size > sizeof(eprom_buf)) {
                  printk("**WARNING**: Voyager insufficient size to read EPROM data, module 0x%x.  Need %d\n", i, eprom_size);
                  outb(VOYAGER_CAT_END, CAT_CMD);
                  continue;
            }
            outb(VOYAGER_CAT_END, CAT_CMD);
            outb(VOYAGER_CAT_RUN, CAT_CMD);
            CDEBUG(("cat_init: module 0x%x, eeprom_size %d\n", i, eprom_size));
            if(cat_subread(*modpp, (*modpp)->asic, 0, 
                         eprom_size, eprom_buf)) {
                  outb(VOYAGER_CAT_END, CAT_CMD);
                  continue;
            }
            outb(VOYAGER_CAT_END, CAT_CMD);
            printk("Module \"%s\", version 0x%x, tracer 0x%x, asics %d\n",
                   cat_module_name(i), eprom_hdr->version_id,
                   *((__u32 *)eprom_hdr->tracer),  eprom_hdr->num_asics);
            (*modpp)->ee_size = eprom_hdr->ee_size;
            (*modpp)->num_asics = eprom_hdr->num_asics;
            asicpp = &((*modpp)->asic);
            sp_offset = eprom_hdr->scan_path_offset;
            /* All we really care about are the Quad cards.  We
                 * identify them because they are in a processor slot
                 * and have only four asics */
            if((i < 0x10 || (i>=0x14 && i < 0x1c) || i>0x1f)) {
                  modpp = &((*modpp)->next);
                  continue;
            }
            /* Now we know it's in a processor slot, does it have
             * a quad baseboard submodule */
            outb(VOYAGER_CAT_RUN, CAT_CMD);
            cat_read(*modpp, (*modpp)->asic, VOYAGER_SUBMODPRESENT,
                   &num_submodules);
            /* lowest two bits, active low */
            num_submodules = ~(0xfc | num_submodules);
            CDEBUG(("VOYAGER CAT: %d submodules present\n", num_submodules));
            if(num_submodules == 0) {
                  /* fill in the dyadic extended processors */
                  __u8 cpu = i & 0x07;

                  printk("Module \"%s\": Dyadic Processor Card\n",
                         cat_module_name(i));
                  voyager_extended_vic_processors |= (1<<cpu);
                  cpu += 4;
                  voyager_extended_vic_processors |= (1<<cpu);
                  outb(VOYAGER_CAT_END, CAT_CMD);
                  continue;
            }

            /* now we want to read the asics on the first submodule,
             * which should be the quad base board */

            cat_read(*modpp, (*modpp)->asic, VOYAGER_SUBMODSELECT, &val);
            CDEBUG(("cat_init: SUBMODSELECT value = 0x%x\n", val));
            val = (val & 0x7c) | VOYAGER_QUAD_BASEBOARD;
            cat_write(*modpp, (*modpp)->asic, VOYAGER_SUBMODSELECT, val);

            outb(VOYAGER_CAT_END, CAT_CMD);
                   

            CDEBUG(("cat_init: Reading eeprom for module 0x%x at offset %d\n", i, VOYAGER_XSUM_END_OFFSET));
            outb(VOYAGER_CAT_RUN, CAT_CMD);
            cat_disconnect(*modpp, (*modpp)->asic);
            if(cat_subread(*modpp, (*modpp)->asic,
                         VOYAGER_XSUM_END_OFFSET, sizeof(eprom_size),
                         &eprom_size)) {
                  printk("**WARNING**: Voyager couldn't read EPROM size for module 0x%x\n", i);
                  outb(VOYAGER_CAT_END, CAT_CMD);
                  continue;
            }
            if(eprom_size > sizeof(eprom_buf)) {
                  printk("**WARNING**: Voyager insufficient size to read EPROM data, module 0x%x.  Need %d\n", i, eprom_size);
                  outb(VOYAGER_CAT_END, CAT_CMD);
                  continue;
            }
            outb(VOYAGER_CAT_END, CAT_CMD);
            outb(VOYAGER_CAT_RUN, CAT_CMD);
            CDEBUG(("cat_init: module 0x%x, eeprom_size %d\n", i, eprom_size));
            if(cat_subread(*modpp, (*modpp)->asic, 0, 
                         eprom_size, eprom_buf)) {
                  outb(VOYAGER_CAT_END, CAT_CMD);
                  continue;
            }
            outb(VOYAGER_CAT_END, CAT_CMD);
            /* Now do everything for the QBB submodule 1 */
            (*modpp)->ee_size = eprom_hdr->ee_size;
            (*modpp)->num_asics = eprom_hdr->num_asics;
            asicpp = &((*modpp)->asic);
            sp_offset = eprom_hdr->scan_path_offset;
            /* get rid of the dummy CAT asic and read the real one */
            kfree((*modpp)->asic);
            for(asic=0; asic < (*modpp)->num_asics; asic++) {
                  int j;
                  voyager_asic_t *asicp = *asicpp 
                        = kzalloc(sizeof(voyager_asic_t), GFP_KERNEL); /*&voyager_asic_storage[asic_count++];*/
                  voyager_sp_table_t *sp_table;
                  voyager_at_t *asic_table;
                  voyager_jtt_t *jtag_table;

                  if(asicp == NULL) {
                        printk("**WARNING** kmalloc failure in cat_init\n");
                        continue;
                  }
                  asicpp = &(asicp->next);
                  asicp->asic_location = asic;
                  sp_table = (voyager_sp_table_t *)(eprom_buf + sp_offset);
                  asicp->asic_id = sp_table->asic_id;
                  asic_table = (voyager_at_t *)(eprom_buf + sp_table->asic_data_offset);
                  for(j=0; j<4; j++)
                        asicp->jtag_id[j] = asic_table->jtag_id[j];
                  jtag_table = (voyager_jtt_t *)(eprom_buf + asic_table->jtag_offset);
                  asicp->ireg_length = jtag_table->ireg_len;
                  asicp->bit_location = (*modpp)->inst_bits;
                  (*modpp)->inst_bits += asicp->ireg_length;
                  if(asicp->ireg_length > (*modpp)->largest_reg)
                        (*modpp)->largest_reg = asicp->ireg_length;
                  if (asicp->ireg_length < (*modpp)->smallest_reg ||
                      (*modpp)->smallest_reg == 0)
                        (*modpp)->smallest_reg = asicp->ireg_length;
                  CDEBUG(("asic 0x%x, ireg_length=%d, bit_location=%d\n",
                        asicp->asic_id, asicp->ireg_length,
                        asicp->bit_location));
                  if(asicp->asic_id == VOYAGER_QUAD_QABC) {
                        CDEBUG(("VOYAGER CAT: QABC ASIC found\n"));
                        qabc_asic = asicp;
                  }
                  sp_offset += sizeof(voyager_sp_table_t);
            }
            CDEBUG(("Module inst_bits = %d, largest_reg = %d, smallest_reg=%d\n",
                  (*modpp)->inst_bits, (*modpp)->largest_reg,
                  (*modpp)->smallest_reg));
            /* OK, now we have the QUAD ASICs set up, use them.
             * we need to:
             *
             * 1. Find the Memory area for the Quad CPIs.
             * 2. Find the Extended VIC processor
             * 3. Configure a second extended VIC processor (This
             *    cannot be done for the 51xx.
             * */
            outb(VOYAGER_CAT_RUN, CAT_CMD);
            cat_connect(*modpp, (*modpp)->asic);
            CDEBUG(("CAT CONNECTED!!\n"));
            cat_subread(*modpp, qabc_asic, 0, sizeof(qabc_data), qabc_data);
            qic_addr = qabc_data[5] << 8;
            qic_addr = (qic_addr | qabc_data[6]) << 8;
            qic_addr = (qic_addr | qabc_data[7]) << 8;
            printk("Module \"%s\": Quad Processor Card; CPI 0x%lx, SET=0x%x\n",
                   cat_module_name(i), qic_addr, qabc_data[8]);
#if 0                   /* plumbing fails---FIXME */
            if((qabc_data[8] & 0xf0) == 0) {
                  /* FIXME: 32 way 8 CPU slot monster cannot be
                   * plumbed this way---need to check for it */

                  printk("Plumbing second Extended Quad Processor\n");
                  /* second VIC line hardwired to Quad CPU 1 */
                  qabc_data[8] |= 0x20;
                  cat_subwrite(*modpp, qabc_asic, 8, 1, &qabc_data[8]);
#ifdef VOYAGER_CAT_DEBUG
                  /* verify plumbing */
                  cat_subread(*modpp, qabc_asic, 8, 1, &qabc_data[8]);
                  if((qabc_data[8] & 0xf0) == 0) {
                        CDEBUG(("PLUMBING FAILED: 0x%x\n", qabc_data[8]));
                  }
#endif
            }
#endif

            {
                  struct resource *res = kzalloc(sizeof(struct resource),GFP_KERNEL);
                  res->name = kmalloc(128, GFP_KERNEL);
                  sprintf((char *)res->name, "Voyager %s Quad CPI", cat_module_name(i));
                  res->start = qic_addr;
                  res->end = qic_addr + 0x3ff;
                  request_resource(&iomem_resource, res);
            }

            qic_addr = (unsigned long)ioremap(qic_addr, 0x400);
                        
            for(j = 0; j < 4; j++) {
                  __u8 cpu;

                  if(voyager_8slot) {
                        /* 8 slot has a different mapping,
                         * each slot has only one vic line, so
                         * 1 cpu in each slot must be < 8 */
                        cpu = (i & 0x07) + j*8;
                  } else {
                        cpu = (i & 0x03) + j*4;
                  }
                  if( (qabc_data[8] & (1<<j))) {
                        voyager_extended_vic_processors |= (1<<cpu);
                  }
                  if(qabc_data[8] & (1<<(j+4)) ) {
                        /* Second SET register plumbed: Quad
                         * card has two VIC connected CPUs.
                         * Secondary cannot be booted as a VIC
                         * CPU */
                        voyager_extended_vic_processors |= (1<<cpu);
                        voyager_allowed_boot_processors &= (~(1<<cpu));
                  }

                  voyager_quad_processors |= (1<<cpu);
                  voyager_quad_cpi_addr[cpu] = (struct voyager_qic_cpi *)
                        (qic_addr+(j<<8));
                  CDEBUG(("CPU%d: CPI address 0x%lx\n", cpu,
                        (unsigned long)voyager_quad_cpi_addr[cpu]));
            }
            outb(VOYAGER_CAT_END, CAT_CMD);

            
            
            *asicpp = NULL;
            modpp = &((*modpp)->next);
      }
      *modpp = NULL;
      printk("CAT Bus Initialisation finished: extended procs 0x%x, quad procs 0x%x, allowed vic boot = 0x%x\n", voyager_extended_vic_processors, voyager_quad_processors, voyager_allowed_boot_processors);
      request_resource(&ioport_resource, &vic_res);
      if(voyager_quad_processors)
            request_resource(&ioport_resource, &qic_res);
      /* set up the front power switch */
}

int
voyager_cat_readb(__u8 module, __u8 asic, int reg)
{
      return 0;
}

static int
cat_disconnect(voyager_module_t *modp, voyager_asic_t *asicp) 
{
      __u8 val;
      int err = 0;

      if(!modp->scan_path_connected)
            return 0;
      if(asicp->asic_id != VOYAGER_CAT_ID) {
            CDEBUG(("cat_disconnect: ASIC is not CAT\n"));
            return 1;
      }
      err = cat_read(modp, asicp, VOYAGER_SCANPATH, &val);
      if(err) {
            CDEBUG(("cat_disconnect: failed to read SCANPATH\n"));
            return err;
      }
      val &= VOYAGER_DISCONNECT_ASIC;
      err = cat_write(modp, asicp, VOYAGER_SCANPATH, val);
      if(err) {
            CDEBUG(("cat_disconnect: failed to write SCANPATH\n"));
            return err;
      }
      outb(VOYAGER_CAT_END, CAT_CMD);
      outb(VOYAGER_CAT_RUN, CAT_CMD);
      modp->scan_path_connected = 0;

      return 0;
}

static int
cat_connect(voyager_module_t *modp, voyager_asic_t *asicp) 
{
      __u8 val;
      int err = 0;

      if(modp->scan_path_connected)
            return 0;
      if(asicp->asic_id != VOYAGER_CAT_ID) {
            CDEBUG(("cat_connect: ASIC is not CAT\n"));
            return 1;
      }

      err = cat_read(modp, asicp, VOYAGER_SCANPATH, &val);
      if(err) {
            CDEBUG(("cat_connect: failed to read SCANPATH\n"));
            return err;
      }
      val |= VOYAGER_CONNECT_ASIC;
      err = cat_write(modp, asicp, VOYAGER_SCANPATH, val);
      if(err) {
            CDEBUG(("cat_connect: failed to write SCANPATH\n"));
            return err;
      }
      outb(VOYAGER_CAT_END, CAT_CMD);
      outb(VOYAGER_CAT_RUN, CAT_CMD);
      modp->scan_path_connected = 1;

      return 0;
}

void
voyager_cat_power_off(void)
{
      /* Power the machine off by writing to the PSI over the CAT
         * bus */
      __u8 data;
      voyager_module_t psi = { 0 };
      voyager_asic_t psi_asic = { 0 };

      psi.asic = &psi_asic;
      psi.asic->asic_id = VOYAGER_CAT_ID;
      psi.asic->subaddr = VOYAGER_SUBADDR_HI;
      psi.module_addr = VOYAGER_PSI;
      psi.scan_path_connected = 0;

      outb(VOYAGER_CAT_END, CAT_CMD);
      /* Connect the PSI to the CAT Bus */
      outb(VOYAGER_CAT_DESELECT, VOYAGER_CAT_CONFIG_PORT);
      outb(VOYAGER_PSI, VOYAGER_CAT_CONFIG_PORT);
      outb(VOYAGER_CAT_RUN, CAT_CMD);
      cat_disconnect(&psi, &psi_asic);
      /* Read the status */
      cat_subread(&psi, &psi_asic, VOYAGER_PSI_GENERAL_REG, 1, &data);
      outb(VOYAGER_CAT_END, CAT_CMD);
      CDEBUG(("PSI STATUS 0x%x\n", data));
      /* These two writes are power off prep and perform */
      data = PSI_CLEAR;
      outb(VOYAGER_CAT_RUN, CAT_CMD);
      cat_subwrite(&psi, &psi_asic, VOYAGER_PSI_GENERAL_REG, 1, &data);
      outb(VOYAGER_CAT_END, CAT_CMD);
      data = PSI_POWER_DOWN;
      outb(VOYAGER_CAT_RUN, CAT_CMD);
      cat_subwrite(&psi, &psi_asic, VOYAGER_PSI_GENERAL_REG, 1, &data);
      outb(VOYAGER_CAT_END, CAT_CMD);
}

struct voyager_status voyager_status = { 0 };

void
voyager_cat_psi(__u8 cmd, __u16 reg, __u8 *data)
{
      voyager_module_t psi = { 0 };
      voyager_asic_t psi_asic = { 0 };

      psi.asic = &psi_asic;
      psi.asic->asic_id = VOYAGER_CAT_ID;
      psi.asic->subaddr = VOYAGER_SUBADDR_HI;
      psi.module_addr = VOYAGER_PSI;
      psi.scan_path_connected = 0;

      outb(VOYAGER_CAT_END, CAT_CMD);
      /* Connect the PSI to the CAT Bus */
      outb(VOYAGER_CAT_DESELECT, VOYAGER_CAT_CONFIG_PORT);
      outb(VOYAGER_PSI, VOYAGER_CAT_CONFIG_PORT);
      outb(VOYAGER_CAT_RUN, CAT_CMD);
      cat_disconnect(&psi, &psi_asic);
      switch(cmd) {
      case VOYAGER_PSI_READ:
            cat_read(&psi, &psi_asic, reg, data);
            break;
      case VOYAGER_PSI_WRITE:
            cat_write(&psi, &psi_asic, reg, *data);
            break;
      case VOYAGER_PSI_SUBREAD:
            cat_subread(&psi, &psi_asic, reg, 1, data);
            break;
      case VOYAGER_PSI_SUBWRITE:
            cat_subwrite(&psi, &psi_asic, reg, 1, data);
            break;
      default:
            printk(KERN_ERR "Voyager PSI, unrecognised command %d\n", cmd);
            break;
      }
      outb(VOYAGER_CAT_END, CAT_CMD);
}

void
voyager_cat_do_common_interrupt(void)
{
      /* This is caused either by a memory parity error or something
       * in the PSI */
      __u8 data;
      voyager_module_t psi = { 0 };
      voyager_asic_t psi_asic = { 0 };
      struct voyager_psi psi_reg;
      int i;
 re_read:
      psi.asic = &psi_asic;
      psi.asic->asic_id = VOYAGER_CAT_ID;
      psi.asic->subaddr = VOYAGER_SUBADDR_HI;
      psi.module_addr = VOYAGER_PSI;
      psi.scan_path_connected = 0;

      outb(VOYAGER_CAT_END, CAT_CMD);
      /* Connect the PSI to the CAT Bus */
      outb(VOYAGER_CAT_DESELECT, VOYAGER_CAT_CONFIG_PORT);
      outb(VOYAGER_PSI, VOYAGER_CAT_CONFIG_PORT);
      outb(VOYAGER_CAT_RUN, CAT_CMD);
      cat_disconnect(&psi, &psi_asic);
      /* Read the status.  NOTE: Need to read *all* the PSI regs here
       * otherwise the cmn int will be reasserted */
      for(i = 0; i < sizeof(psi_reg.regs); i++) {
            cat_read(&psi, &psi_asic, i, &((__u8 *)&psi_reg.regs)[i]);
      }
      outb(VOYAGER_CAT_END, CAT_CMD);
      if((psi_reg.regs.checkbit & 0x02) == 0) {
            psi_reg.regs.checkbit |= 0x02;
            cat_write(&psi, &psi_asic, 5, psi_reg.regs.checkbit);
            printk("VOYAGER RE-READ PSI\n");
            goto re_read;
      }
      outb(VOYAGER_CAT_RUN, CAT_CMD);
      for(i = 0; i < sizeof(psi_reg.subregs); i++) {
            /* This looks strange, but the PSI doesn't do auto increment
             * correctly */
            cat_subread(&psi, &psi_asic, VOYAGER_PSI_SUPPLY_REG + i, 
                      1, &((__u8 *)&psi_reg.subregs)[i]); 
      }
      outb(VOYAGER_CAT_END, CAT_CMD);
#ifdef VOYAGER_CAT_DEBUG
      printk("VOYAGER PSI: ");
      for(i=0; i<sizeof(psi_reg.regs); i++)
            printk("%02x ", ((__u8 *)&psi_reg.regs)[i]);
      printk("\n           ");
      for(i=0; i<sizeof(psi_reg.subregs); i++)
            printk("%02x ", ((__u8 *)&psi_reg.subregs)[i]);
      printk("\n");
#endif
      if(psi_reg.regs.intstatus & PSI_MON) {
            /* switch off or power fail */

            if(psi_reg.subregs.supply & PSI_SWITCH_OFF) {
                  if(voyager_status.switch_off) {
                        printk(KERN_ERR "Voyager front panel switch turned off again---Immediate power off!\n");
                        voyager_cat_power_off();
                        /* not reached */
                  } else {
                        printk(KERN_ERR "Voyager front panel switch turned off\n");
                        voyager_status.switch_off = 1;
                        voyager_status.request_from_kernel = 1;
                        wake_up_process(voyager_thread);
                  }
                  /* Tell the hardware we're taking care of the
                   * shutdown, otherwise it will power the box off
                   * within 3 seconds of the switch being pressed and,
                   * which is much more important to us, continue to 
                   * assert the common interrupt */
                  data = PSI_CLR_SWITCH_OFF;
                  outb(VOYAGER_CAT_RUN, CAT_CMD);
                  cat_subwrite(&psi, &psi_asic, VOYAGER_PSI_SUPPLY_REG,
                             1, &data);
                  outb(VOYAGER_CAT_END, CAT_CMD);
            } else {

                  VDEBUG(("Voyager ac fail reg 0x%x\n",
                        psi_reg.subregs.ACfail));
                  if((psi_reg.subregs.ACfail & AC_FAIL_STAT_CHANGE) == 0) {
                        /* No further update */
                        return;
                  }
#if 0
                  /* Don't bother trying to find out who failed.
                   * FIXME: This probably makes the code incorrect on
                   * anything other than a 345x */
                  for(i=0; i< 5; i++) {
                        if( psi_reg.subregs.ACfail &(1<<i)) {
                              break;
                        }
                  }
                  printk(KERN_NOTICE "AC FAIL IN SUPPLY %d\n", i);
#endif
                  /* DON'T do this: it shuts down the AC PSI 
                  outb(VOYAGER_CAT_RUN, CAT_CMD);
                  data = PSI_MASK_MASK | i;
                  cat_subwrite(&psi, &psi_asic, VOYAGER_PSI_MASK,
                             1, &data);
                  outb(VOYAGER_CAT_END, CAT_CMD);
                  */
                  printk(KERN_ERR "Voyager AC power failure\n");
                  outb(VOYAGER_CAT_RUN, CAT_CMD);
                  data = PSI_COLD_START;
                  cat_subwrite(&psi, &psi_asic, VOYAGER_PSI_GENERAL_REG,
                             1, &data);
                  outb(VOYAGER_CAT_END, CAT_CMD);
                  voyager_status.power_fail = 1;
                  voyager_status.request_from_kernel = 1;
                  wake_up_process(voyager_thread);
            }
            
            
      } else if(psi_reg.regs.intstatus & PSI_FAULT) {
            /* Major fault! */
            printk(KERN_ERR "Voyager PSI Detected major fault, immediate power off!\n");
            voyager_cat_power_off();
            /* not reached */
      } else if(psi_reg.regs.intstatus & (PSI_DC_FAIL | PSI_ALARM
                                  | PSI_CURRENT | PSI_DVM
                                  | PSI_PSCFAULT | PSI_STAT_CHG)) {
            /* other psi fault */

            printk(KERN_WARNING "Voyager PSI status 0x%x\n", data);
            /* clear the PSI fault */
            outb(VOYAGER_CAT_RUN, CAT_CMD);
            cat_write(&psi, &psi_asic, VOYAGER_PSI_STATUS_REG, 0);
            outb(VOYAGER_CAT_END, CAT_CMD);
      }
}

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