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#include <asm/dma.h>
  28
  29extern void __flush_disable_L1(void);
  30
  31void amigaone_show_cpuinfo(struct seq_file *m)
  32{
  33        seq_printf(m, "vendor\t\t: Eyetech Ltd.\n");
  34}
  35
  36static int __init amigaone_add_bridge(struct device_node *dev)
  37{
  38        const u32 *cfg_addr, *cfg_data;
  39        int len;
  40        const int *bus_range;
  41        struct pci_controller *hose;
  42
  43        printk(KERN_INFO "Adding PCI host bridge %s\n", dev->full_name);
  44
  45        cfg_addr = of_get_address(dev, 0, NULL, NULL);
  46        cfg_data = of_get_address(dev, 1, NULL, NULL);
  47        if ((cfg_addr == NULL) || (cfg_data == NULL))
  48                return -ENODEV;
  49
  50        bus_range = of_get_property(dev, "bus-range", &len);
  51        if ((bus_range == NULL) || (len < 2 * sizeof(int)))
  52                printk(KERN_WARNING "Can't get bus-range for %s, assume"
  53                       " bus 0\n", dev->full_name);
  54
  55        hose = pcibios_alloc_controller(dev);
  56        if (hose == NULL)
  57                return -ENOMEM;
  58
  59        hose->first_busno = bus_range ? bus_range[0] : 0;
  60        hose->last_busno = bus_range ? bus_range[1] : 0xff;
  61
  62        setup_indirect_pci(hose, cfg_addr[0], cfg_data[0], 0);
  63
  64        /* Interpret the "ranges" property */
  65        /* This also maps the I/O region and sets isa_io/mem_base */
  66        pci_process_bridge_OF_ranges(hose, dev, 1);
  67
  68        return 0;
  69}
  70
  71void __init amigaone_setup_arch(void)
  72{
  73        struct device_node *np;
  74        int phb = -ENODEV;
  75
  76        /* Lookup PCI host bridges. */
  77        for_each_compatible_node(np, "pci", "mai-logic,articia-s")
  78                phb = amigaone_add_bridge(np);
  79
  80        BUG_ON(phb != 0);
  81
  82        if (ppc_md.progress)
  83                ppc_md.progress("Linux/PPC "UTS_RELEASE"\n", 0);
  84}
  85
  86void __init amigaone_init_IRQ(void)
  87{
  88        struct device_node *pic, *np = NULL;
  89        const unsigned long *prop = NULL;
  90        unsigned long int_ack = 0;
  91
  92        /* Search for ISA interrupt controller. */
  93        pic = of_find_compatible_node(NULL, "interrupt-controller",
  94                                      "pnpPNP,000");
  95        BUG_ON(pic == NULL);
  96
  97        /* Look for interrupt acknowledge address in the PCI root node. */
  98        np = of_find_compatible_node(NULL, "pci", "mai-logic,articia-s");
  99        if (np) {
 100                prop = of_get_property(np, "8259-interrupt-acknowledge", NULL);
 101                if (prop)
 102                        int_ack = prop[0];
 103                of_node_put(np);
 104        }
 105
 106        if (int_ack == 0)
 107                printk(KERN_WARNING "Cannot find PCI interrupt acknowledge"
 108                       " address, polling\n");
 109
 110        i8259_init(pic, int_ack);
 111        ppc_md.get_irq = i8259_irq;
 112        irq_set_default_host(i8259_get_host());
 113}
 114
 115static int __init request_isa_regions(void)
 116{
 117        request_region(0x00, 0x20, "dma1");
 118        request_region(0x40, 0x20, "timer");
 119        request_region(0x80, 0x10, "dma page reg");
 120        request_region(0xc0, 0x20, "dma2");
 121
 122        return 0;
 123}
 124machine_device_initcall(amigaone, request_isa_regions);
 125
 126void amigaone_restart(char *cmd)
 127{
 128        local_irq_disable();
 129
 130        /* Flush and disable caches. */
 131        __flush_disable_L1();
 132
 133        /* Set SRR0 to the reset vector and turn on MSR_IP. */
 134        mtspr(SPRN_SRR0, 0xfff00100);
 135        mtspr(SPRN_SRR1, MSR_IP);
 136
 137        /* Do an rfi to jump back to firmware. */
 138        __asm__ __volatile__("rfi" : : : "memory");
 139
 140        /* Not reached. */
 141        while (1);
 142}
 143
 144static int __init amigaone_probe(void)
 145{
 146        unsigned long root = of_get_flat_dt_root();
 147
 148        if (of_flat_dt_is_compatible(root, "eyetech,amigaone")) {
 149                /*
 150                 * Coherent memory access cause complete system lockup! Thus
 151                 * disable this CPU feature, even if the CPU needs it.
 152                 */
 153                cur_cpu_spec->cpu_features &= ~CPU_FTR_NEED_COHERENT;
 154
 155                ISA_DMA_THRESHOLD = 0x00ffffff;
 156                DMA_MODE_READ = 0x44;
 157                DMA_MODE_WRITE = 0x48;
 158
 159                return 1;
 160        }
 161
 162        return 0;
 163}
 164
 165define_machine(amigaone) {
 166        .name                   = "AmigaOne",
 167        .probe                  = amigaone_probe,
 168        .setup_arch             = amigaone_setup_arch,
 169        .show_cpuinfo           = amigaone_show_cpuinfo,
 170        .init_IRQ               = amigaone_init_IRQ,
 171        .restart                = amigaone_restart,
 172        .calibrate_decr         = generic_calibrate_decr,
 173        .progress               = udbg_progress,
 174};
 175