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ip22-int.c

/*
 * ip22-int.c: Routines for generic manipulation of the INT[23] ASIC
 *             found on INDY and Indigo2 workstations.
 *
 * Copyright (C) 1996 David S. Miller (dm@engr.sgi.com)
 * Copyright (C) 1997, 1998 Ralf Baechle (ralf@gnu.org)
 * Copyright (C) 1999 Andrew R. Baker (andrewb@uab.edu)
 *                    - Indigo2 changes
 *                    - Interrupt handling fixes
 * Copyright (C) 2001, 2003 Ladislav Michl (ladis@linux-mips.org)
 */
#include <linux/types.h>
#include <linux/init.h>
#include <linux/kernel_stat.h>
#include <linux/interrupt.h>

#include <asm/irq_cpu.h>
#include <asm/sgi/hpc3.h>
#include <asm/sgi/ip22.h>

/* So far nothing hangs here */
#undef USE_LIO3_IRQ

struct sgint_regs *sgint;

static char lc0msk_to_irqnr[256];
static char lc1msk_to_irqnr[256];
static char lc2msk_to_irqnr[256];
static char lc3msk_to_irqnr[256];

extern int ip22_eisa_init(void);

static void enable_local0_irq(unsigned int irq)
{
      /* don't allow mappable interrupt to be enabled from setup_irq,
       * we have our own way to do so */
      if (irq != SGI_MAP_0_IRQ)
            sgint->imask0 |= (1 << (irq - SGINT_LOCAL0));
}

static void disable_local0_irq(unsigned int irq)
{
      sgint->imask0 &= ~(1 << (irq - SGINT_LOCAL0));
}

static struct irq_chip ip22_local0_irq_type = {
      .name       = "IP22 local 0",
      .ack        = disable_local0_irq,
      .mask       = disable_local0_irq,
      .mask_ack   = disable_local0_irq,
      .unmask           = enable_local0_irq,
};

static void enable_local1_irq(unsigned int irq)
{
      /* don't allow mappable interrupt to be enabled from setup_irq,
       * we have our own way to do so */
      if (irq != SGI_MAP_1_IRQ)
            sgint->imask1 |= (1 << (irq - SGINT_LOCAL1));
}

static void disable_local1_irq(unsigned int irq)
{
      sgint->imask1 &= ~(1 << (irq - SGINT_LOCAL1));
}

static struct irq_chip ip22_local1_irq_type = {
      .name       = "IP22 local 1",
      .ack        = disable_local1_irq,
      .mask       = disable_local1_irq,
      .mask_ack   = disable_local1_irq,
      .unmask           = enable_local1_irq,
};

static void enable_local2_irq(unsigned int irq)
{
      sgint->imask0 |= (1 << (SGI_MAP_0_IRQ - SGINT_LOCAL0));
      sgint->cmeimask0 |= (1 << (irq - SGINT_LOCAL2));
}

static void disable_local2_irq(unsigned int irq)
{
      sgint->cmeimask0 &= ~(1 << (irq - SGINT_LOCAL2));
      if (!sgint->cmeimask0)
            sgint->imask0 &= ~(1 << (SGI_MAP_0_IRQ - SGINT_LOCAL0));
}

static struct irq_chip ip22_local2_irq_type = {
      .name       = "IP22 local 2",
      .ack        = disable_local2_irq,
      .mask       = disable_local2_irq,
      .mask_ack   = disable_local2_irq,
      .unmask           = enable_local2_irq,
};

static void enable_local3_irq(unsigned int irq)
{
      sgint->imask1 |= (1 << (SGI_MAP_1_IRQ - SGINT_LOCAL1));
      sgint->cmeimask1 |= (1 << (irq - SGINT_LOCAL3));
}

static void disable_local3_irq(unsigned int irq)
{
      sgint->cmeimask1 &= ~(1 << (irq - SGINT_LOCAL3));
      if (!sgint->cmeimask1)
            sgint->imask1 &= ~(1 << (SGI_MAP_1_IRQ - SGINT_LOCAL1));
}

static struct irq_chip ip22_local3_irq_type = {
      .name       = "IP22 local 3",
      .ack        = disable_local3_irq,
      .mask       = disable_local3_irq,
      .mask_ack   = disable_local3_irq,
      .unmask           = enable_local3_irq,
};

static void indy_local0_irqdispatch(void)
{
      u8 mask = sgint->istat0 & sgint->imask0;
      u8 mask2;
      int irq;

      if (mask & SGINT_ISTAT0_LIO2) {
            mask2 = sgint->vmeistat & sgint->cmeimask0;
            irq = lc2msk_to_irqnr[mask2];
      } else
            irq = lc0msk_to_irqnr[mask];

      /* if irq == 0, then the interrupt has already been cleared */
      if (irq)
            do_IRQ(irq);
}

static void indy_local1_irqdispatch(void)
{
      u8 mask = sgint->istat1 & sgint->imask1;
      u8 mask2;
      int irq;

      if (mask & SGINT_ISTAT1_LIO3) {
            mask2 = sgint->vmeistat & sgint->cmeimask1;
            irq = lc3msk_to_irqnr[mask2];
      } else
            irq = lc1msk_to_irqnr[mask];

      /* if irq == 0, then the interrupt has already been cleared */
      if (irq)
            do_IRQ(irq);
}

extern void ip22_be_interrupt(int irq);

static void indy_buserror_irq(void)
{
      int irq = SGI_BUSERR_IRQ;

      irq_enter();
      kstat_this_cpu.irqs[irq]++;
      ip22_be_interrupt(irq);
      irq_exit();
}

static struct irqaction local0_cascade = {
      .handler    = no_action,
      .flags            = IRQF_DISABLED,
      .name       = "local0 cascade",
};

static struct irqaction local1_cascade = {
      .handler    = no_action,
      .flags            = IRQF_DISABLED,
      .name       = "local1 cascade",
};

static struct irqaction buserr = {
      .handler    = no_action,
      .flags            = IRQF_DISABLED,
      .name       = "Bus Error",
};

static struct irqaction map0_cascade = {
      .handler    = no_action,
      .flags            = IRQF_DISABLED,
      .name       = "mapable0 cascade",
};

#ifdef USE_LIO3_IRQ
static struct irqaction map1_cascade = {
      .handler    = no_action,
      .flags            = IRQF_DISABLED,
      .name       = "mapable1 cascade",
};
#define SGI_INTERRUPTS  SGINT_END
#else
#define SGI_INTERRUPTS  SGINT_LOCAL3
#endif

extern void indy_8254timer_irq(void);

/*
 * IRQs on the INDY look basically (barring software IRQs which we don't use
 * at all) like:
 *
 *    MIPS IRQ    Source
 *      --------        ------
 *             0  Software (ignored)
 *             1        Software (ignored)
 *             2        Local IRQ level zero
 *             3        Local IRQ level one
 *             4        8254 Timer zero
 *             5        8254 Timer one
 *             6        Bus Error
 *             7        R4k timer (what we use)
 *
 * We handle the IRQ according to _our_ priority which is:
 *
 * Highest ----     R4k Timer
 *                  Local IRQ zero
 *                  Local IRQ one
 *                  Bus Error
 *                  8254 Timer zero
 * Lowest  ----     8254 Timer one
 *
 * then we just return, if multiple IRQs are pending then we will just take
 * another exception, big deal.
 */

asmlinkage void plat_irq_dispatch(void)
{
      unsigned int pending = read_c0_status() & read_c0_cause();

      /*
       * First we check for r4k counter/timer IRQ.
       */
      if (pending & CAUSEF_IP7)
            do_IRQ(SGI_TIMER_IRQ);
      else if (pending & CAUSEF_IP2)
            indy_local0_irqdispatch();
      else if (pending & CAUSEF_IP3)
            indy_local1_irqdispatch();
      else if (pending & CAUSEF_IP6)
            indy_buserror_irq();
      else if (pending & (CAUSEF_IP4 | CAUSEF_IP5))
            indy_8254timer_irq();
}

void __init arch_init_irq(void)
{
      int i;

      /* Init local mask --> irq tables. */
      for (i = 0; i < 256; i++) {
            if (i & 0x80) {
                  lc0msk_to_irqnr[i] = SGINT_LOCAL0 + 7;
                  lc1msk_to_irqnr[i] = SGINT_LOCAL1 + 7;
                  lc2msk_to_irqnr[i] = SGINT_LOCAL2 + 7;
                  lc3msk_to_irqnr[i] = SGINT_LOCAL3 + 7;
            } else if (i & 0x40) {
                  lc0msk_to_irqnr[i] = SGINT_LOCAL0 + 6;
                  lc1msk_to_irqnr[i] = SGINT_LOCAL1 + 6;
                  lc2msk_to_irqnr[i] = SGINT_LOCAL2 + 6;
                  lc3msk_to_irqnr[i] = SGINT_LOCAL3 + 6;
            } else if (i & 0x20) {
                  lc0msk_to_irqnr[i] = SGINT_LOCAL0 + 5;
                  lc1msk_to_irqnr[i] = SGINT_LOCAL1 + 5;
                  lc2msk_to_irqnr[i] = SGINT_LOCAL2 + 5;
                  lc3msk_to_irqnr[i] = SGINT_LOCAL3 + 5;
            } else if (i & 0x10) {
                  lc0msk_to_irqnr[i] = SGINT_LOCAL0 + 4;
                  lc1msk_to_irqnr[i] = SGINT_LOCAL1 + 4;
                  lc2msk_to_irqnr[i] = SGINT_LOCAL2 + 4;
                  lc3msk_to_irqnr[i] = SGINT_LOCAL3 + 4;
            } else if (i & 0x08) {
                  lc0msk_to_irqnr[i] = SGINT_LOCAL0 + 3;
                  lc1msk_to_irqnr[i] = SGINT_LOCAL1 + 3;
                  lc2msk_to_irqnr[i] = SGINT_LOCAL2 + 3;
                  lc3msk_to_irqnr[i] = SGINT_LOCAL3 + 3;
            } else if (i & 0x04) {
                  lc0msk_to_irqnr[i] = SGINT_LOCAL0 + 2;
                  lc1msk_to_irqnr[i] = SGINT_LOCAL1 + 2;
                  lc2msk_to_irqnr[i] = SGINT_LOCAL2 + 2;
                  lc3msk_to_irqnr[i] = SGINT_LOCAL3 + 2;
            } else if (i & 0x02) {
                  lc0msk_to_irqnr[i] = SGINT_LOCAL0 + 1;
                  lc1msk_to_irqnr[i] = SGINT_LOCAL1 + 1;
                  lc2msk_to_irqnr[i] = SGINT_LOCAL2 + 1;
                  lc3msk_to_irqnr[i] = SGINT_LOCAL3 + 1;
            } else if (i & 0x01) {
                  lc0msk_to_irqnr[i] = SGINT_LOCAL0 + 0;
                  lc1msk_to_irqnr[i] = SGINT_LOCAL1 + 0;
                  lc2msk_to_irqnr[i] = SGINT_LOCAL2 + 0;
                  lc3msk_to_irqnr[i] = SGINT_LOCAL3 + 0;
            } else {
                  lc0msk_to_irqnr[i] = 0;
                  lc1msk_to_irqnr[i] = 0;
                  lc2msk_to_irqnr[i] = 0;
                  lc3msk_to_irqnr[i] = 0;
            }
      }

      /* Mask out all interrupts. */
      sgint->imask0 = 0;
      sgint->imask1 = 0;
      sgint->cmeimask0 = 0;
      sgint->cmeimask1 = 0;

      /* init CPU irqs */
      mips_cpu_irq_init();

      for (i = SGINT_LOCAL0; i < SGI_INTERRUPTS; i++) {
            struct irq_chip *handler;

            if (i < SGINT_LOCAL1)
                  handler           = &ip22_local0_irq_type;
            else if (i < SGINT_LOCAL2)
                  handler           = &ip22_local1_irq_type;
            else if (i < SGINT_LOCAL3)
                  handler           = &ip22_local2_irq_type;
            else
                  handler           = &ip22_local3_irq_type;

            set_irq_chip_and_handler(i, handler, handle_level_irq);
      }

      /* vector handler. this register the IRQ as non-sharable */
      setup_irq(SGI_LOCAL_0_IRQ, &local0_cascade);
      setup_irq(SGI_LOCAL_1_IRQ, &local1_cascade);
      setup_irq(SGI_BUSERR_IRQ, &buserr);

      /* cascade in cascade. i love Indy ;-) */
      setup_irq(SGI_MAP_0_IRQ, &map0_cascade);
#ifdef USE_LIO3_IRQ
      setup_irq(SGI_MAP_1_IRQ, &map1_cascade);
#endif

#ifdef CONFIG_EISA
      if (ip22_is_fullhouse())      /* Only Indigo-2 has EISA stuff */
            ip22_eisa_init();
#endif
}

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