setup.c

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/*
 * AmigaOne platform setup
 *
 * Copyright 2008 Gerhard Pircher ([email protected])
 *
 *   Based on original amigaone_setup.c source code
 * Copyright 2003 by Hans-Joerg Frieden and Thomas Frieden
 *
 * 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.
 */

#include <linux/kernel.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/seq_file.h>
#include <generated/utsrelease.h>

#include <asm/machdep.h>
#include <asm/cputable.h>
#include <asm/pci-bridge.h>
#include <asm/i8259.h>
#include <asm/time.h>
#include <asm/udbg.h>

extern void __flush_disable_L1(void);

void amigaone_show_cpuinfo(struct seq_file *m)
{
    seq_printf(m, "vendor\t\t: Eyetech Ltd.\n");
}

static int __init amigaone_add_bridge(struct device_node *dev)
{
    const u32 *cfg_addr, *cfg_data;
    int len;
    const int *bus_range;
    struct pci_controller *hose;

    printk(KERN_INFO "Adding PCI host bridge %s\n", dev->full_name);

    cfg_addr = of_get_address(dev, 0, NULL, NULL);
    cfg_data = of_get_address(dev, 1, NULL, NULL);
    if ((cfg_addr == NULL) || (cfg_data == NULL))
        return -ENODEV;

    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, cfg_addr[0], cfg_data[0], 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);

    return 0;
}

void __init amigaone_setup_arch(void)
{
    struct device_node *np;
    int phb = -ENODEV;

    /* Lookup PCI host bridges. */
    for_each_compatible_node(np, "pci", "mai-logic,articia-s")
        phb = amigaone_add_bridge(np);

    BUG_ON(phb != 0);

    if (ppc_md.progress)
        ppc_md.progress("Linux/PPC "UTS_RELEASE"\n", 0);
}

void __init amigaone_init_IRQ(void)
{
    struct device_node *pic, *np = NULL;
    const unsigned long *prop = NULL;
    unsigned long int_ack = 0;

    /* Search for ISA interrupt controller. */
    pic = of_find_compatible_node(NULL, "interrupt-controller",
                                  "pnpPNP,000");
    BUG_ON(pic == NULL);

    /* Look for interrupt acknowledge address in the PCI root node. */
    np = of_find_compatible_node(NULL, "pci", "mai-logic,articia-s");
    if (np) {
        prop = of_get_property(np, "8259-interrupt-acknowledge", NULL);
        if (prop)
            int_ack = prop[0];
        of_node_put(np);
    }

    if (int_ack == 0)
        printk(KERN_WARNING "Cannot find PCI interrupt acknowledge"
               " address, polling\n");

    i8259_init(pic, int_ack);
    ppc_md.get_irq = i8259_irq;
    irq_set_default_host(i8259_get_host());
}

static int __init request_isa_regions(void)
{
    request_region(0x00, 0x20, "dma1");
    request_region(0x40, 0x20, "timer");
    request_region(0x80, 0x10, "dma page reg");
    request_region(0xc0, 0x20, "dma2");

    return 0;
}
machine_device_initcall(amigaone, request_isa_regions);

void amigaone_restart(char *cmd)
{
    local_irq_disable();

    /* Flush and disable caches. */
    __flush_disable_L1();

        /* Set SRR0 to the reset vector and turn on MSR_IP. */
    mtspr(SPRN_SRR0, 0xfff00100);
    mtspr(SPRN_SRR1, MSR_IP);

    /* Do an rfi to jump back to firmware. */
    __asm__ __volatile__("rfi" : : : "memory");

    /* Not reached. */
    while (1);
}

static int __init amigaone_probe(void)
{
    unsigned long root = of_get_flat_dt_root();

    if (of_flat_dt_is_compatible(root, "eyetech,amigaone")) {
        /*
         * Coherent memory access cause complete system lockup! Thus
         * disable this CPU feature, even if the CPU needs it.
         */
        cur_cpu_spec->cpu_features &= ~CPU_FTR_NEED_COHERENT;

        ISA_DMA_THRESHOLD = 0x00ffffff;
        DMA_MODE_READ = 0x44;
        DMA_MODE_WRITE = 0x48;

        return 1;
    }

    return 0;
}

define_machine(amigaone) {
    .name           = "AmigaOne",
    .probe          = amigaone_probe,
    .setup_arch     = amigaone_setup_arch,
    .show_cpuinfo       = amigaone_show_cpuinfo,
    .init_IRQ       = amigaone_init_IRQ,
    .restart        = amigaone_restart,
    .calibrate_decr     = generic_calibrate_decr,
    .progress       = udbg_progress,
};