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