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
  27 extern void __flush_disable_L1(void);
  28
  29 void amigaone_show_cpuinfo(struct seq_file *m)
  30 {
  31         seq_printf(m, "vendor\t\t: Eyetech Ltd.\n");
  32 }
  33
  34 static 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
  69 void __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
  84 void __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
 113 void __init amigaone_init(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
 121 void amigaone_restart(char *cmd)
 122 {
 123         local_irq_disable();
 124
 125         /* Flush and disable caches. */
 126         __flush_disable_L1();
 127
 128         /* Set SRR0 to the reset vector and turn on MSR_IP. */
 129         mtspr(SPRN_SRR0, 0xfff00100);
 130         mtspr(SPRN_SRR1, MSR_IP);
 131
 132         /* Do an rfi to jump back to firmware. */
 133         __asm__ __volatile__("rfi" : : : "memory");
 134
 135         /* Not reached. */
 136         while (1);
 137 }
 138
 139 static int __init amigaone_probe(void)
 140 {
 141         unsigned long root = of_get_flat_dt_root();
 142
 143         if (of_flat_dt_is_compatible(root, "eyetech,amigaone")) {
 144                 /*
 145                  * Coherent memory access cause complete system lockup! Thus
 146                  * disable this CPU feature, even if the CPU needs it.
 147                  */
 148                 cur_cpu_spec->cpu_features &= ~CPU_FTR_NEED_COHERENT;
 149
 150                 ISA_DMA_THRESHOLD = 0x00ffffff;
 151                 DMA_MODE_READ = 0x44;
 152                 DMA_MODE_WRITE = 0x48;
 153
 154                 return 1;
 155         }
 156
 157         return 0;
 158 }
 159
 160 define_machine(amigaone) {
 161         .name                   = "AmigaOne",
 162         .probe                  = amigaone_probe,
 163         .setup_arch             = amigaone_setup_arch,
 164         .init                   = amigaone_init,
 165         .show_cpuinfo           = amigaone_show_cpuinfo,
 166         .init_IRQ               = amigaone_init_IRQ,
 167         .restart                = amigaone_restart,
 168         .calibrate_decr         = generic_calibrate_decr,
 169         .progress               = udbg_progress,
 170 };