linkstation.c

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/*
 * Board setup routines for the Buffalo Linkstation / Kurobox Platform.
 *
 * Copyright (C) 2006 G. Liakhovetski ([email protected])
 *
 * 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 <asm/time.h>
#include <asm/prom.h>
#include <asm/mpic.h>
#include <asm/pci-bridge.h>

#include "mpc10x.h"

static __initdata struct of_device_id of_bus_ids[] = {
    { .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 %s\n", dev->full_name);

    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 %s, assume"
                " bus 0\n", dev->full_name);

    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)
{
    struct device_node *np;

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

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

/*
 * 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);
}

extern void avr_uart_configure(void);
extern void avr_uart_send(const char);

static void 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 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 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)
{
    unsigned long root;

    root = of_get_flat_dt_root();

    if (!of_flat_dt_is_compatible(root, "linkstation"))
        return 0;
    return 1;
}

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