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sys_takara.c

/*
 *    linux/arch/alpha/kernel/sys_takara.c
 *
 *    Copyright (C) 1995 David A Rusling
 *    Copyright (C) 1996 Jay A Estabrook
 *    Copyright (C) 1998, 1999 Richard Henderson
 *
 * Code supporting the TAKARA.
 */

#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/mm.h>
#include <linux/sched.h>
#include <linux/pci.h>
#include <linux/init.h>

#include <asm/ptrace.h>
#include <asm/system.h>
#include <asm/dma.h>
#include <asm/irq.h>
#include <asm/mmu_context.h>
#include <asm/io.h>
#include <asm/pgtable.h>
#include <asm/core_cia.h>
#include <asm/tlbflush.h>

#include "proto.h"
#include "irq_impl.h"
#include "pci_impl.h"
#include "machvec_impl.h"


/* Note mask bit is true for DISABLED irqs.  */
static unsigned long cached_irq_mask[2] = { -1, -1 };

static inline void
takara_update_irq_hw(unsigned long irq, unsigned long mask)
{
      int regaddr;

      mask = (irq >= 64 ? mask << 16 : mask >> ((irq - 16) & 0x30));
      regaddr = 0x510 + (((irq - 16) >> 2) & 0x0c);
      outl(mask & 0xffff0000UL, regaddr);
}

static inline void
takara_enable_irq(unsigned int irq)
{
      unsigned long mask;
      mask = (cached_irq_mask[irq >= 64] &= ~(1UL << (irq & 63)));
      takara_update_irq_hw(irq, mask);
}

static void
takara_disable_irq(unsigned int irq)
{
      unsigned long mask;
      mask = (cached_irq_mask[irq >= 64] |= 1UL << (irq & 63));
      takara_update_irq_hw(irq, mask);
}

static unsigned int
takara_startup_irq(unsigned int irq)
{
      takara_enable_irq(irq);
      return 0; /* never anything pending */
}

static void
takara_end_irq(unsigned int irq)
{
      if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
            takara_enable_irq(irq);
}

static struct hw_interrupt_type takara_irq_type = {
      .typename   = "TAKARA",
      .startup    = takara_startup_irq,
      .shutdown   = takara_disable_irq,
      .enable           = takara_enable_irq,
      .disable    = takara_disable_irq,
      .ack        = takara_disable_irq,
      .end        = takara_end_irq,
};

static void
takara_device_interrupt(unsigned long vector)
{
      unsigned intstatus;

      /*
       * The PALcode will have passed us vectors 0x800 or 0x810,
       * which are fairly arbitrary values and serve only to tell
       * us whether an interrupt has come in on IRQ0 or IRQ1. If
       * it's IRQ1 it's a PCI interrupt; if it's IRQ0, it's
       * probably ISA, but PCI interrupts can come through IRQ0
       * as well if the interrupt controller isn't in accelerated
       * mode.
       *
       * OTOH, the accelerator thing doesn't seem to be working
       * overly well, so what we'll do instead is try directly
       * examining the Master Interrupt Register to see if it's a
       * PCI interrupt, and if _not_ then we'll pass it on to the
       * ISA handler.
       */

      intstatus = inw(0x500) & 15;
      if (intstatus) {
            /*
             * This is a PCI interrupt. Check each bit and
             * despatch an interrupt if it's set.
             */

            if (intstatus & 8) handle_irq(16+3);
            if (intstatus & 4) handle_irq(16+2);
            if (intstatus & 2) handle_irq(16+1);
            if (intstatus & 1) handle_irq(16+0);
      } else {
            isa_device_interrupt (vector);
      }
}

static void 
takara_srm_device_interrupt(unsigned long vector)
{
      int irq = (vector - 0x800) >> 4;
      handle_irq(irq);
}

static void __init
takara_init_irq(void)
{
      long i;

      init_i8259a_irqs();

      if (alpha_using_srm) {
            alpha_mv.device_interrupt = takara_srm_device_interrupt;
      } else {
            unsigned int ctlreg = inl(0x500);

            /* Return to non-accelerated mode.  */
            ctlreg &= ~0x8000;
            outl(ctlreg, 0x500);

            /* Enable the PCI interrupt register.  */
            ctlreg = 0x05107c00;
            outl(ctlreg, 0x500);
      }

      for (i = 16; i < 128; i += 16)
            takara_update_irq_hw(i, -1);

      for (i = 16; i < 128; ++i) {
            irq_desc[i].status = IRQ_DISABLED | IRQ_LEVEL;
            irq_desc[i].chip = &takara_irq_type;
      }

      common_init_isa_dma();
}


/*
 * The Takara has PCI devices 1, 2, and 3 configured to slots 20,
 * 19, and 18 respectively, in the default configuration. They can
 * also be jumpered to slots 8, 7, and 6 respectively, which is fun
 * because the SIO ISA bridge can also be slot 7. However, the SIO
 * doesn't explicitly generate PCI-type interrupts, so we can
 * assign it whatever the hell IRQ we like and it doesn't matter.
 */

static int __init
takara_map_irq_srm(struct pci_dev *dev, u8 slot, u8 pin)
{
      static char irq_tab[15][5] __initdata = {
            { 16+3, 16+3, 16+3, 16+3, 16+3},   /* slot  6 == device 3 */
            { 16+2, 16+2, 16+2, 16+2, 16+2},   /* slot  7 == device 2 */
            { 16+1, 16+1, 16+1, 16+1, 16+1},   /* slot  8 == device 1 */
            {   -1,   -1,   -1,   -1,   -1},   /* slot  9 == nothing */
            {   -1,   -1,   -1,   -1,   -1},   /* slot 10 == nothing */
            {   -1,   -1,   -1,   -1,   -1},   /* slot 11 == nothing */
            /* These are behind the bridges.  */
            {   12,   12,   13,   14,   15},   /* slot 12 == nothing */
            {    8,    8,    9,   19,   11},   /* slot 13 == nothing */
            {    4,    4,    5,    6,    7},   /* slot 14 == nothing */
            {    0,    0,    1,    2,    3},   /* slot 15 == nothing */
            {   -1,   -1,   -1,   -1,   -1},   /* slot 16 == nothing */
            {64+ 0, 64+0, 64+1, 64+2, 64+3},   /* slot 17= device 4 */
            {48+ 0, 48+0, 48+1, 48+2, 48+3},   /* slot 18= device 3 */
            {32+ 0, 32+0, 32+1, 32+2, 32+3},   /* slot 19= device 2 */
            {16+ 0, 16+0, 16+1, 16+2, 16+3},   /* slot 20= device 1 */
      };
      const long min_idsel = 6, max_idsel = 20, irqs_per_slot = 5;
        int irq = COMMON_TABLE_LOOKUP;
      if (irq >= 0 && irq < 16) {
            /* Guess that we are behind a bridge.  */
            unsigned int busslot = PCI_SLOT(dev->bus->self->devfn);
            irq += irq_tab[busslot-min_idsel][0];
      }
      return irq;
}

static int __init
takara_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
{
      static char irq_tab[15][5] __initdata = {
            { 16+3, 16+3, 16+3, 16+3, 16+3},   /* slot  6 == device 3 */
            { 16+2, 16+2, 16+2, 16+2, 16+2},   /* slot  7 == device 2 */
            { 16+1, 16+1, 16+1, 16+1, 16+1},   /* slot  8 == device 1 */
            {   -1,   -1,   -1,   -1,   -1},   /* slot  9 == nothing */
            {   -1,   -1,   -1,   -1,   -1},   /* slot 10 == nothing */
            {   -1,   -1,   -1,   -1,   -1},   /* slot 11 == nothing */
            {   -1,   -1,   -1,   -1,   -1},   /* slot 12 == nothing */
            {   -1,   -1,   -1,   -1,   -1},   /* slot 13 == nothing */
            {   -1,   -1,   -1,   -1,   -1},   /* slot 14 == nothing */
            {   -1,   -1,   -1,   -1,   -1},   /* slot 15 == nothing */
            {   -1,   -1,   -1,   -1,   -1},   /* slot 16 == nothing */
            {   -1,   -1,   -1,   -1,   -1},   /* slot 17 == nothing */
            { 16+3, 16+3, 16+3, 16+3, 16+3},   /* slot 18 == device 3 */
            { 16+2, 16+2, 16+2, 16+2, 16+2},   /* slot 19 == device 2 */
            { 16+1, 16+1, 16+1, 16+1, 16+1},   /* slot 20 == device 1 */
      };
      const long min_idsel = 6, max_idsel = 20, irqs_per_slot = 5;
      return COMMON_TABLE_LOOKUP;
}

static u8 __init
takara_swizzle(struct pci_dev *dev, u8 *pinp)
{
      int slot = PCI_SLOT(dev->devfn);
      int pin = *pinp;
      unsigned int ctlreg = inl(0x500);
      unsigned int busslot;

      if (!dev->bus->self)
            return slot;

      busslot = PCI_SLOT(dev->bus->self->devfn);
      /* Check for built-in bridges.  */
      if (dev->bus->number != 0
          && busslot > 16
          && ((1<<(36-busslot)) & ctlreg)) {
            if (pin == 1)
                  pin += (20 - busslot);
            else {
                  printk(KERN_WARNING "takara_swizzle: can only "
                         "handle cards with INTA IRQ pin.\n");
            }
      } else {
            /* Must be a card-based bridge.  */
            printk(KERN_WARNING "takara_swizzle: cannot handle "
                   "card-bridge behind builtin bridge yet.\n");
      }

      *pinp = pin;
      return slot;
}

static void __init
takara_init_pci(void)
{
      if (alpha_using_srm)
            alpha_mv.pci_map_irq = takara_map_irq_srm;

      cia_init_pci();
      ns87312_enable_ide(0x26e);
}


/*
 * The System Vector
 */

struct alpha_machine_vector takara_mv __initmv = {
      .vector_name            = "Takara",
      DO_EV5_MMU,
      DO_DEFAULT_RTC,
      DO_CIA_IO,
      .machine_check          = cia_machine_check,
      .max_isa_dma_address    = ALPHA_MAX_ISA_DMA_ADDRESS,
      .min_io_address         = DEFAULT_IO_BASE,
      .min_mem_address  = CIA_DEFAULT_MEM_BASE,

      .nr_irqs          = 128,
      .device_interrupt = takara_device_interrupt,

      .init_arch        = cia_init_arch,
      .init_irq         = takara_init_irq,
      .init_rtc         = common_init_rtc,
      .init_pci         = takara_init_pci,
      .kill_arch        = cia_kill_arch,
      .pci_map_irq            = takara_map_irq,
      .pci_swizzle            = takara_swizzle,
};
ALIAS_MV(takara)

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