generic.c

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/*
 * arch/arm/mach-netx/generic.c
 *
 * Copyright (C) 2005 Sascha Hauer <[email protected]>, 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 <linux/io.h>
#include <mach/hardware.h>
#include <asm/mach/map.h>
#include <asm/hardware/vic.h>
#include <mach/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 irq_desc *desc)
{
    unsigned int irq = NETX_IRQ_HIF_CHAINED(0);
    unsigned int stat;

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

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

static int
netx_hif_irq_type(struct irq_data *d, unsigned int type)
{
    unsigned int val, irq;

    val = readl(NETX_DPMAS_IF_CONF1);

    irq = d->irq - NETX_IRQ_HIF_CHAINED(0);

    if (type & IRQ_TYPE_EDGE_RISING) {
        DEBUG_IRQ("rising edges\n");
        val |= (1 << 26) << irq;
    }
    if (type & IRQ_TYPE_EDGE_FALLING) {
        DEBUG_IRQ("falling edges\n");
        val &= ~((1 << 26) << irq);
    }
    if (type & IRQ_TYPE_LEVEL_LOW) {
        DEBUG_IRQ("low level\n");
        val &= ~((1 << 26) << irq);
    }
    if (type & IRQ_TYPE_LEVEL_HIGH) {
        DEBUG_IRQ("high level\n");
        val |= (1 << 26) << irq;
    }

    writel(val, NETX_DPMAS_IF_CONF1);

    return 0;
}

static void
netx_hif_ack_irq(struct irq_data *d)
{
    unsigned int val, irq;

    irq = d->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", __func__, d->irq);
}

static void
netx_hif_mask_irq(struct irq_data *d)
{
    unsigned int val, irq;

    irq = d->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", __func__, d->irq);
}

static void
netx_hif_unmask_irq(struct irq_data *d)
{
    unsigned int val, irq;

    irq = d->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", __func__, d->irq);
}

static struct irq_chip netx_hif_chip = {
    .irq_ack = netx_hif_ack_irq,
    .irq_mask = netx_hif_mask_irq,
    .irq_unmask = netx_hif_unmask_irq,
    .irq_set_type = netx_hif_irq_type,
};

void __init netx_init_irq(void)
{
    int irq;

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

    for (irq = NETX_IRQ_HIF_CHAINED(0); irq <= NETX_IRQ_HIF_LAST; irq++) {
        irq_set_chip_and_handler(irq, &netx_hif_chip,
                     handle_level_irq);
        set_irq_flags(irq, IRQF_VALID);
    }

    writel(NETX_DPMAS_INT_EN_GLB_EN, NETX_DPMAS_INT_EN);
    irq_set_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);

void netx_restart(char mode, const char *cmd)
{
    writel(NETX_SYSTEM_RES_CR_FIRMW_RES_EN | NETX_SYSTEM_RES_CR_FIRMW_RES,
           NETX_SYSTEM_RES_CR);
}