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generic.c

/*
 * arch/arm/mach-netx/generic.c
 *
 * Copyright (C) 2005 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2
 * as published by the Free Software Foundation.
 *
 * 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#include <linux/device.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <asm/hardware.h>
#include <asm/mach/map.h>
#include <asm/hardware/vic.h>
#include <asm/io.h>
#include <asm/arch/netx-regs.h>
#include <asm/mach/irq.h>

static struct map_desc netx_io_desc[] __initdata = {
      {
            .virtual        = NETX_IO_VIRT,
            .pfn            = __phys_to_pfn(NETX_IO_PHYS),
            .length         = NETX_IO_SIZE,
            .type           = MT_DEVICE
      }
};

void __init netx_map_io(void)
{
      iotable_init(netx_io_desc, ARRAY_SIZE(netx_io_desc));
}

static struct resource netx_rtc_resources[] = {
      [0] = {
            .start      = 0x00101200,
            .end  = 0x00101220,
            .flags      = IORESOURCE_MEM,
      },
};

static struct platform_device netx_rtc_device = {
      .name       = "netx-rtc",
      .id         = 0,
      .num_resources    = ARRAY_SIZE(netx_rtc_resources),
      .resource   = netx_rtc_resources,
};

static struct platform_device *devices[] __initdata = {
      &netx_rtc_device,
};

#if 0
#define DEBUG_IRQ(fmt...)     printk(fmt)
#else
#define DEBUG_IRQ(fmt...)     while (0) {}
#endif

static void
netx_hif_demux_handler(unsigned int irq_unused, struct irqdesc *desc,
                  struct pt_regs *regs)
{
      unsigned int irq = NETX_IRQ_HIF_CHAINED(0);
      unsigned int stat;

      stat = ((readl(NETX_DPMAS_INT_EN) &
            readl(NETX_DPMAS_INT_STAT)) >> 24) & 0x1f;

      desc = irq_desc + NETX_IRQ_HIF_CHAINED(0);

      while (stat) {
            if (stat & 1) {
                  DEBUG_IRQ("handling irq %d\n", irq);
                  desc_handle_irq(irq, desc, regs);
            }
            irq++;
            desc++;
            stat >>= 1;
      }
}

static int
netx_hif_irq_type(unsigned int _irq, unsigned int type)
{
      unsigned int val, irq;

      val = readl(NETX_DPMAS_IF_CONF1);

      irq = _irq - NETX_IRQ_HIF_CHAINED(0);

      if (type & __IRQT_RISEDGE) {
            DEBUG_IRQ("rising edges\n");
            val |= (1 << 26) << irq;
      }
      if (type & __IRQT_FALEDGE) {
            DEBUG_IRQ("falling edges\n");
            val &= ~((1 << 26) << irq);
      }
      if (type & __IRQT_LOWLVL) {
            DEBUG_IRQ("low level\n");
            val &= ~((1 << 26) << irq);
      }
      if (type & __IRQT_HIGHLVL) {
            DEBUG_IRQ("high level\n");
            val |= (1 << 26) << irq;
      }

      writel(val, NETX_DPMAS_IF_CONF1);

      return 0;
}

static void
netx_hif_ack_irq(unsigned int _irq)
{
      unsigned int val, irq;

      irq = _irq - NETX_IRQ_HIF_CHAINED(0);
      writel((1 << 24) << irq, NETX_DPMAS_INT_STAT);

      val = readl(NETX_DPMAS_INT_EN);
      val &= ~((1 << 24) << irq);
      writel(val, NETX_DPMAS_INT_EN);

      DEBUG_IRQ("%s: irq %d\n", __FUNCTION__, _irq);
}

static void
netx_hif_mask_irq(unsigned int _irq)
{
      unsigned int val, irq;

      irq = _irq - NETX_IRQ_HIF_CHAINED(0);
      val = readl(NETX_DPMAS_INT_EN);
      val &= ~((1 << 24) << irq);
      writel(val, NETX_DPMAS_INT_EN);
      DEBUG_IRQ("%s: irq %d\n", __FUNCTION__, _irq);
}

static void
netx_hif_unmask_irq(unsigned int _irq)
{
      unsigned int val, irq;

      irq = _irq - NETX_IRQ_HIF_CHAINED(0);
      val = readl(NETX_DPMAS_INT_EN);
      val |= (1 << 24) << irq;
      writel(val, NETX_DPMAS_INT_EN);
      DEBUG_IRQ("%s: irq %d\n", __FUNCTION__, _irq);
}

static struct irqchip netx_hif_chip = {
      .ack = netx_hif_ack_irq,
      .mask = netx_hif_mask_irq,
      .unmask = netx_hif_unmask_irq,
      .set_type = netx_hif_irq_type,
};

void __init netx_init_irq(void)
{
      int irq;

      vic_init(__io(io_p2v(NETX_PA_VIC)), 0, ~0);

      for (irq = NETX_IRQ_HIF_CHAINED(0); irq <= NETX_IRQ_HIF_LAST; irq++) {
            set_irq_chip(irq, &netx_hif_chip);
            set_irq_handler(irq, do_level_IRQ);
            set_irq_flags(irq, IRQF_VALID);
      }

      writel(NETX_DPMAS_INT_EN_GLB_EN, NETX_DPMAS_INT_EN);
      set_irq_chained_handler(NETX_IRQ_HIF, netx_hif_demux_handler);
}

static int __init netx_init(void)
{
      return platform_add_devices(devices, ARRAY_SIZE(devices));
}

subsys_initcall(netx_init);


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