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irq-mb93493.c

/* irq-mb93493.c: MB93493 companion chip interrupt handler
 *
 * Copyright (C) 2006 Red Hat, Inc. All Rights Reserved.
 * Written by David Howells (dhowells@redhat.com)
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version
 * 2 of the License, or (at your option) any later version.
 */

#include <linux/ptrace.h>
#include <linux/errno.h>
#include <linux/signal.h>
#include <linux/sched.h>
#include <linux/ioport.h>
#include <linux/interrupt.h>
#include <linux/init.h>
#include <linux/irq.h>
#include <linux/bitops.h>

#include <asm/io.h>
#include <asm/system.h>
#include <asm/delay.h>
#include <asm/irq.h>
#include <asm/irc-regs.h>
#include <asm/mb93493-irqs.h>
#include <asm/mb93493-regs.h>

#define IRQ_ROUTE_ONE(X) (X##_ROUTE << (X - IRQ_BASE_MB93493))

#define IRQ_ROUTING                             \
      (IRQ_ROUTE_ONE(IRQ_MB93493_VDC)           |     \
       IRQ_ROUTE_ONE(IRQ_MB93493_VCC)           |     \
       IRQ_ROUTE_ONE(IRQ_MB93493_AUDIO_OUT)     |     \
       IRQ_ROUTE_ONE(IRQ_MB93493_I2C_0)   |     \
       IRQ_ROUTE_ONE(IRQ_MB93493_I2C_1)   |     \
       IRQ_ROUTE_ONE(IRQ_MB93493_USB)           |     \
       IRQ_ROUTE_ONE(IRQ_MB93493_LOCAL_BUS)     |     \
       IRQ_ROUTE_ONE(IRQ_MB93493_PCMCIA)  |     \
       IRQ_ROUTE_ONE(IRQ_MB93493_GPIO)    |     \
       IRQ_ROUTE_ONE(IRQ_MB93493_AUDIO_IN))

/*
 * daughter board PIC operations
 * - there is no way to ACK interrupts in the MB93493 chip
 */
static void frv_mb93493_mask(unsigned int irq)
{
      uint32_t iqsr;
      volatile void *piqsr;

      if (IRQ_ROUTING & (1 << (irq - IRQ_BASE_MB93493)))
            piqsr = __addr_MB93493_IQSR(1);
      else
            piqsr = __addr_MB93493_IQSR(0);

      iqsr = readl(piqsr);
      iqsr &= ~(1 << (irq - IRQ_BASE_MB93493 + 16));
      writel(iqsr, piqsr);
}

static void frv_mb93493_ack(unsigned int irq)
{
}

static void frv_mb93493_unmask(unsigned int irq)
{
      uint32_t iqsr;
      volatile void *piqsr;

      if (IRQ_ROUTING & (1 << (irq - IRQ_BASE_MB93493)))
            piqsr = __addr_MB93493_IQSR(1);
      else
            piqsr = __addr_MB93493_IQSR(0);

      iqsr = readl(piqsr);
      iqsr |= 1 << (irq - IRQ_BASE_MB93493 + 16);
      writel(iqsr, piqsr);
}

static struct irq_chip frv_mb93493_pic = {
      .name       = "mb93093",
      .ack        = frv_mb93493_ack,
      .mask       = frv_mb93493_mask,
      .mask_ack   = frv_mb93493_mask,
      .unmask           = frv_mb93493_unmask,
};

/*
 * MB93493 PIC interrupt handler
 */
static irqreturn_t mb93493_interrupt(int irq, void *_piqsr)
{
      volatile void *piqsr = _piqsr;
      uint32_t iqsr;

      iqsr = readl(piqsr);
      iqsr = iqsr & (iqsr >> 16) & 0xffff;

      /* poll all the triggered IRQs */
      while (iqsr) {
            int irq;

            asm("scan %1,gr0,%0" : "=r"(irq) : "r"(iqsr));
            irq = 31 - irq;
            iqsr &= ~(1 << irq);

            generic_handle_irq(IRQ_BASE_MB93493 + irq);
      }

      return IRQ_HANDLED;
}

/*
 * define an interrupt action for each MB93493 PIC output
 * - use dev_id to indicate the MB93493 PIC input to output mappings
 */
static struct irqaction mb93493_irq[2]  = {
      [0] = {
            .handler    = mb93493_interrupt,
            .flags            = IRQF_DISABLED | IRQF_SHARED,
            .mask       = CPU_MASK_NONE,
            .name       = "mb93493.0",
            .dev_id           = (void *) __addr_MB93493_IQSR(0),
      },
      [1] = {
            .handler    = mb93493_interrupt,
            .flags            = IRQF_DISABLED | IRQF_SHARED,
            .mask       = CPU_MASK_NONE,
            .name       = "mb93493.1",
            .dev_id           = (void *) __addr_MB93493_IQSR(1),
      }
};

/*
 * initialise the motherboard MB93493's PIC
 */
void __init mb93493_init(void)
{
      int irq;

      for (irq = IRQ_BASE_MB93493 + 0; irq <= IRQ_BASE_MB93493 + 10; irq++)
            set_irq_chip_and_handler(irq, &frv_mb93493_pic, handle_edge_irq);

      /* the MB93493 drives external IRQ inputs on the CPU PIC */
      setup_irq(IRQ_CPU_MB93493_0, &mb93493_irq[0]);
      setup_irq(IRQ_CPU_MB93493_1, &mb93493_irq[1]);
}

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