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icoll.c

/*
 * Copyright (C) 2009-2010 Freescale Semiconductor, Inc. All Rights Reserved.
 *
 * 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.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/irq.h>
#include <linux/io.h>

#include <mach/mxs.h>
#include <mach/common.h>

#define HW_ICOLL_VECTOR                   0x0000
#define HW_ICOLL_LEVELACK                 0x0010
#define HW_ICOLL_CTRL                     0x0020
#define HW_ICOLL_INTERRUPTn_SET(n)        (0x0124 + (n) * 0x10)
#define HW_ICOLL_INTERRUPTn_CLR(n)        (0x0128 + (n) * 0x10)
#define BM_ICOLL_INTERRUPTn_ENABLE        0x00000004
#define BV_ICOLL_LEVELACK_IRQLEVELACK__LEVEL0   0x1

static void __iomem *icoll_base = MXS_IO_ADDRESS(MXS_ICOLL_BASE_ADDR);

static void icoll_ack_irq(unsigned int irq)
{
      /*
       * The Interrupt Collector is able to prioritize irqs.
       * Currently only level 0 is used. So acking can use
       * BV_ICOLL_LEVELACK_IRQLEVELACK__LEVEL0 unconditionally.
       */
      __raw_writel(BV_ICOLL_LEVELACK_IRQLEVELACK__LEVEL0,
                  icoll_base + HW_ICOLL_LEVELACK);
}

static void icoll_mask_irq(unsigned int irq)
{
      __raw_writel(BM_ICOLL_INTERRUPTn_ENABLE,
                  icoll_base + HW_ICOLL_INTERRUPTn_CLR(irq));
}

static void icoll_unmask_irq(unsigned int irq)
{
      __raw_writel(BM_ICOLL_INTERRUPTn_ENABLE,
                  icoll_base + HW_ICOLL_INTERRUPTn_SET(irq));
}

static struct irq_chip mxs_icoll_chip = {
      .ack = icoll_ack_irq,
      .mask = icoll_mask_irq,
      .unmask = icoll_unmask_irq,
};

void __init icoll_init_irq(void)
{
      int i;

      /*
       * Interrupt Collector reset, which initializes the priority
       * for each irq to level 0.
       */
      mxs_reset_block(icoll_base + HW_ICOLL_CTRL);

      for (i = 0; i < MXS_INTERNAL_IRQS; i++) {
            set_irq_chip(i, &mxs_icoll_chip);
            set_irq_handler(i, handle_level_irq);
            set_irq_flags(i, IRQF_VALID);
      }
}

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