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
  29 extern void __flush_disable_L1(void);
  30
  31 void amigaone_show_cpuinfo(struct seq_file *m)
  32 {
  33         seq_printf(m, "vendor\t\t: Eyetech Ltd.\n");
  34 }
  35
  36 static 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 %pOF\n", dev);
  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 %pOF, assume"
  53                        " bus 0\n", dev);
  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
  71 void __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
  86 void __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
 115 static 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 }
 124 machine_device_initcall(amigaone, request_isa_regions);
 125
 126 void __noreturn 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
 144 static int __init amigaone_probe(void)
 145 {
 146         if (of_machine_is_compatible("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
 163 define_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 };