/*
 * Board setup routines for the Buffalo Linkstation / Kurobox Platform.
 *
 * Copyright (C) 2006 G. Liakhovetski (g.liakhovetski@gmx.de)
 *
 * Based on sandpoint.c by Mark A. Greer
 *
 * This file is licensed under the terms of the GNU General Public License
 * version 2.  This program is licensed "as is" without any warranty of
 * any kind, whether express or implied.
 */

#include <linux/kernel.h>
#include <linux/initrd.h>
#include <linux/of_platform.h>
#include <linux/seq_file.h>

#include <asm/time.h>
#include <asm/mpic.h>
#include <asm/pci-bridge.h>

#include "mpc10x.h"

static const struct of_device_id of_bus_ids[] __initconst = {
        { .type = "soc", },
        { .compatible = "simple-bus", },
        {},
};

static int __init declare_of_platform_devices(void)
{
        of_platform_bus_probe(NULL, of_bus_ids, NULL);
        return 0;
}
machine_device_initcall(linkstation, declare_of_platform_devices);

static int __init linkstation_add_bridge(struct device_node *dev)
{
#ifdef CONFIG_PCI
        int len;
        struct pci_controller *hose;
        const int *bus_range;

        printk("Adding PCI host bridge %pOF\n", dev);

        bus_range = of_get_property(dev, "bus-range", &len);
        if (bus_range == NULL || len < 2 * sizeof(int))
                printk(KERN_WARNING "Can't get bus-range for %pOF, assume"
                                " bus 0\n", dev);

        hose = pcibios_alloc_controller(dev);
        if (hose == NULL)
                return -ENOMEM;
        hose->first_busno = bus_range ? bus_range[0] : 0;
        hose->last_busno = bus_range ? bus_range[1] : 0xff;
        setup_indirect_pci(hose, 0xfec00000, 0xfee00000, 0);

        /* Interpret the "ranges" property */
        /* This also maps the I/O region and sets isa_io/mem_base */
        pci_process_bridge_OF_ranges(hose, dev, 1);
#endif
        return 0;
}

static void __init linkstation_setup_arch(void)
{
        printk(KERN_INFO "BUFFALO Network Attached Storage Series\n");
        printk(KERN_INFO "(C) 2002-2005 BUFFALO INC.\n");
}

static void __init linkstation_setup_pci(void)
{
        struct device_node *np;

        /* Lookup PCI host bridges */
        for_each_compatible_node(np, "pci", "mpc10x-pci")
                linkstation_add_bridge(np);
}

/*
 * Interrupt setup and service.  Interrupts on the linkstation come
 * from the four PCI slots plus onboard 8241 devices: I2C, DUART.
 */
static void __init linkstation_init_IRQ(void)
{
        struct mpic *mpic;

        mpic = mpic_alloc(NULL, 0, 0, 4, 0, " EPIC     ");
        BUG_ON(mpic == NULL);

        /* PCI IRQs */
        mpic_assign_isu(mpic, 0, mpic->paddr + 0x10200);

        /* I2C */
        mpic_assign_isu(mpic, 1, mpic->paddr + 0x11000);

        /* ttyS0, ttyS1 */
        mpic_assign_isu(mpic, 2, mpic->paddr + 0x11100);

        mpic_init(mpic);
}

static void __noreturn linkstation_restart(char *cmd)
{
        local_irq_disable();

        /* Reset system via AVR */
        avr_uart_configure();
        /* Send reboot command */
        avr_uart_send('C');

        for(;;)  /* Spin until reset happens */
                avr_uart_send('G');     /* "kick" */
}

static void __noreturn linkstation_power_off(void)
{
        local_irq_disable();

        /* Power down system via AVR */
        avr_uart_configure();
        /* send shutdown command */
        avr_uart_send('E');

        for(;;)  /* Spin until power-off happens */
                avr_uart_send('G');     /* "kick" */
        /* NOTREACHED */
}

static void __noreturn linkstation_halt(void)
{
        linkstation_power_off();
        /* NOTREACHED */
}

static void linkstation_show_cpuinfo(struct seq_file *m)
{
        seq_printf(m, "vendor\t\t: Buffalo Technology\n");
        seq_printf(m, "machine\t\t: Linkstation I/Kurobox(HG)\n");
}

static int __init linkstation_probe(void)
{
        pm_power_off = linkstation_power_off;

        return 1;
}

define_machine(linkstation){
        .name                   = "Buffalo Linkstation",
        .compatible             = "linkstation",
        .probe                  = linkstation_probe,
        .setup_arch             = linkstation_setup_arch,
        .discover_phbs          = linkstation_setup_pci,
        .init_IRQ               = linkstation_init_IRQ,
        .show_cpuinfo           = linkstation_show_cpuinfo,
        .get_irq                = mpic_get_irq,
        .restart                = linkstation_restart,
        .halt                   = linkstation_halt,
};