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
  28 extern void __flush_disable_L1(void);
  29
  30 void amigaone_show_cpuinfo(struct seq_file *m)
  31 {
  32         seq_printf(m, "vendor\t\t: Eyetech Ltd.\n");
  33 }
  34
  35 static 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
  70 void __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
  85 void __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
 114 static 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 }
 123 machine_device_initcall(amigaone, request_isa_regions);
 124
 125 void 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
 143 static 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
 164 define_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 };