LXR linux/arch/powerpc/platforms/amigaone/setup.c

   1/*
   2 * AmigaOne platform setup
   3 *
   4 * Copyright 2008 Gerhard Pircher (gerhard_pircher@gmx.net)
   5 *
   6 *   Based on original amigaone_setup.c source code
   7 * Copyright 2003 by Hans-Joerg Frieden and Thomas Frieden
   8 *
   9 * This program is free software; you can redistribute  it and/or modify it
  10 * under  the terms of  the GNU General  Public License as published by the
  11 * Free Software Foundation;  either version 2 of the  License, or (at your
  12 * option) any later version.
  13 */
  14
  15#include <linux/kernel.h>
  16#include <linux/of.h>
  17#include <linux/of_address.h>
  18#include <linux/seq_file.h>
  19#include <generated/utsrelease.h>
  20
  21#include <asm/machdep.h>
  22#include <asm/cputable.h>
  23#include <asm/pci-bridge.h>
  24#include <asm/i8259.h>
  25#include <asm/time.h>
  26#include <asm/udbg.h>
  27
  28extern void __flush_disable_L1(void);
  29
  30void amigaone_show_cpuinfo(struct seq_file *m)
  31{
  32        seq_printf(m, "vendor\t\t: Eyetech Ltd.\n");
  33}
  34
  35static int __init amigaone_add_bridge(struct device_node *dev)
  36{
  37        const u32 *cfg_addr, *cfg_data;
  38        int len;
  39        const int *bus_range;
  40        struct pci_controller *hose;
  41
  42        printk(KERN_INFO "Adding PCI host bridge %s\n", dev->full_name);
  43
  44        cfg_addr = of_get_address(dev, 0, NULL, NULL);
  45        cfg_data = of_get_address(dev, 1, NULL, NULL);
  46        if ((cfg_addr == NULL) || (cfg_data == NULL))
  47                return -ENODEV;
  48
  49        bus_range = of_get_property(dev, "bus-range", &len);
  50        if ((bus_range == NULL) || (len < 2 * sizeof(int)))
  51                printk(KERN_WARNING "Can't get bus-range for %s, assume"
  52                       " bus 0\n", dev->full_name);
  53
  54        hose = pcibios_alloc_controller(dev);
  55        if (hose == NULL)
  56                return -ENOMEM;
  57
  58        hose->first_busno = bus_range ? bus_range[0] : 0;
  59        hose->last_busno = bus_range ? bus_range[1] : 0xff;
  60
  61        setup_indirect_pci(hose, cfg_addr[0], cfg_data[0], 0);
  62
  63        /* Interpret the "ranges" property */
  64        /* This also maps the I/O region and sets isa_io/mem_base */
  65        pci_process_bridge_OF_ranges(hose, dev, 1);
  66
  67        return 0;
  68}
  69
  70void __init amigaone_setup_arch(void)
  71{
  72        struct device_node *np;
  73        int phb = -ENODEV;
  74
  75        /* Lookup PCI host bridges. */
  76        for_each_compatible_node(np, "pci", "mai-logic,articia-s")
  77                phb = amigaone_add_bridge(np);
  78
  79        BUG_ON(phb != 0);
  80
  81        if (ppc_md.progress)
  82                ppc_md.progress("Linux/PPC "UTS_RELEASE"\n", 0);
  83}
  84
  85void __init amigaone_init_IRQ(void)
  86{
  87        struct device_node *pic, *np = NULL;
  88        const unsigned long *prop = NULL;
  89        unsigned long int_ack = 0;
  90
  91        /* Search for ISA interrupt controller. */
  92        pic = of_find_compatible_node(NULL, "interrupt-controller",
  93                                      "pnpPNP,000");
  94        BUG_ON(pic == NULL);
  95
  96        /* Look for interrupt acknowledge address in the PCI root node. */
  97        np = of_find_compatible_node(NULL, "pci", "mai-logic,articia-s");
  98        if (np) {
  99                prop = of_get_property(np, "8259-interrupt-acknowledge", NULL);
 100                if (prop)
 101                        int_ack = prop[0];
 102                of_node_put(np);
 103        }
 104
 105        if (int_ack == 0)
 106                printk(KERN_WARNING "Cannot find PCI interrupt acknowledge"
 107                       " address, polling\n");
 108
 109        i8259_init(pic, int_ack);
 110        ppc_md.get_irq = i8259_irq;
 111        irq_set_default_host(i8259_get_host());
 112}
 113
 114static int __init request_isa_regions(void)
 115{
 116        request_region(0x00, 0x20, "dma1");
 117        request_region(0x40, 0x20, "timer");
 118        request_region(0x80, 0x10, "dma page reg");
 119        request_region(0xc0, 0x20, "dma2");
 120
 121        return 0;
 122}
 123machine_device_initcall(amigaone, request_isa_regions);
 124
 125void amigaone_restart(char *cmd)
 126{
 127        local_irq_disable();
 128
 129        /* Flush and disable caches. */
 130        __flush_disable_L1();
 131
 132        /* Set SRR0 to the reset vector and turn on MSR_IP. */
 133        mtspr(SPRN_SRR0, 0xfff00100);
 134        mtspr(SPRN_SRR1, MSR_IP);
 135
 136        /* Do an rfi to jump back to firmware. */
 137        __asm__ __volatile__("rfi" : : : "memory");
 138
 139        /* Not reached. */
 140        while (1);
 141}
 142
 143static int __init amigaone_probe(void)
 144{
 145        unsigned long root = of_get_flat_dt_root();
 146
 147        if (of_flat_dt_is_compatible(root, "eyetech,amigaone")) {
 148                /*
 149                 * Coherent memory access cause complete system lockup! Thus
 150                 * disable this CPU feature, even if the CPU needs it.
 151                 */
 152                cur_cpu_spec->cpu_features &= ~CPU_FTR_NEED_COHERENT;
 153
 154                ISA_DMA_THRESHOLD = 0x00ffffff;
 155                DMA_MODE_READ = 0x44;
 156                DMA_MODE_WRITE = 0x48;
 157
 158                return 1;
 159        }
 160
 161        return 0;
 162}
 163
 164define_machine(amigaone) {
 165        .name                   = "AmigaOne",
 166        .probe                  = amigaone_probe,
 167        .setup_arch             = amigaone_setup_arch,
 168        .show_cpuinfo           = amigaone_show_cpuinfo,
 169        .init_IRQ               = amigaone_init_IRQ,
 170        .restart                = amigaone_restart,
 171        .calibrate_decr         = generic_calibrate_decr,
 172        .progress               = udbg_progress,
 173};
 174