linux/arch/powerpc/platforms/amigaone/setup.c
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   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 * AmigaOne platform setup
   4 *
   5 * Copyright 2008 Gerhard Pircher (gerhard_pircher@gmx.net)
   6 *
   7 *   Based on original amigaone_setup.c source code
   8 * Copyright 2003 by Hans-Joerg Frieden and Thomas Frieden
   9 */
  10
  11#include <linux/kernel.h>
  12#include <linux/of.h>
  13#include <linux/of_address.h>
  14#include <linux/seq_file.h>
  15#include <generated/utsrelease.h>
  16
  17#include <asm/machdep.h>
  18#include <asm/cputable.h>
  19#include <asm/pci-bridge.h>
  20#include <asm/i8259.h>
  21#include <asm/time.h>
  22#include <asm/udbg.h>
  23#include <asm/dma.h>
  24
  25extern void __flush_disable_L1(void);
  26
  27void amigaone_show_cpuinfo(struct seq_file *m)
  28{
  29        seq_printf(m, "vendor\t\t: Eyetech Ltd.\n");
  30}
  31
  32static int __init amigaone_add_bridge(struct device_node *dev)
  33{
  34        const u32 *cfg_addr, *cfg_data;
  35        int len;
  36        const int *bus_range;
  37        struct pci_controller *hose;
  38
  39        printk(KERN_INFO "Adding PCI host bridge %pOF\n", dev);
  40
  41        cfg_addr = of_get_address(dev, 0, NULL, NULL);
  42        cfg_data = of_get_address(dev, 1, NULL, NULL);
  43        if ((cfg_addr == NULL) || (cfg_data == NULL))
  44                return -ENODEV;
  45
  46        bus_range = of_get_property(dev, "bus-range", &len);
  47        if ((bus_range == NULL) || (len < 2 * sizeof(int)))
  48                printk(KERN_WARNING "Can't get bus-range for %pOF, assume"
  49                       " bus 0\n", dev);
  50
  51        hose = pcibios_alloc_controller(dev);
  52        if (hose == NULL)
  53                return -ENOMEM;
  54
  55        hose->first_busno = bus_range ? bus_range[0] : 0;
  56        hose->last_busno = bus_range ? bus_range[1] : 0xff;
  57
  58        setup_indirect_pci(hose, cfg_addr[0], cfg_data[0], 0);
  59
  60        /* Interpret the "ranges" property */
  61        /* This also maps the I/O region and sets isa_io/mem_base */
  62        pci_process_bridge_OF_ranges(hose, dev, 1);
  63
  64        return 0;
  65}
  66
  67void __init amigaone_setup_arch(void)
  68{
  69        if (ppc_md.progress)
  70                ppc_md.progress("Linux/PPC "UTS_RELEASE"\n", 0);
  71}
  72
  73static void __init amigaone_discover_phbs(void)
  74{
  75        struct device_node *np;
  76        int phb = -ENODEV;
  77
  78        /* Lookup PCI host bridges. */
  79        for_each_compatible_node(np, "pci", "mai-logic,articia-s")
  80                phb = amigaone_add_bridge(np);
  81
  82        BUG_ON(phb != 0);
  83}
  84
  85void __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
 114static 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}
 123machine_device_initcall(amigaone, request_isa_regions);
 124
 125void __noreturn 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
 143static int __init amigaone_probe(void)
 144{
 145        if (of_machine_is_compatible("eyetech,amigaone")) {
 146                /*
 147                 * Coherent memory access cause complete system lockup! Thus
 148                 * disable this CPU feature, even if the CPU needs it.
 149                 */
 150                cur_cpu_spec->cpu_features &= ~CPU_FTR_NEED_COHERENT;
 151
 152                DMA_MODE_READ = 0x44;
 153                DMA_MODE_WRITE = 0x48;
 154
 155                return 1;
 156        }
 157
 158        return 0;
 159}
 160
 161define_machine(amigaone) {
 162        .name                   = "AmigaOne",
 163        .probe                  = amigaone_probe,
 164        .setup_arch             = amigaone_setup_arch,
 165        .discover_phbs          = amigaone_discover_phbs,
 166        .show_cpuinfo           = amigaone_show_cpuinfo,
 167        .init_IRQ               = amigaone_init_IRQ,
 168        .restart                = amigaone_restart,
 169        .calibrate_decr         = generic_calibrate_decr,
 170        .progress               = udbg_progress,
 171};
 172