LXR linux/arch/powerpc/platforms/amigaone/setup.c

   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        struct device_node *np;
  70        int phb = -ENODEV;
  71
  72        /* Lookup PCI host bridges. */
  73        for_each_compatible_node(np, "pci", "mai-logic,articia-s")
  74                phb = amigaone_add_bridge(np);
  75
  76        BUG_ON(phb != 0);
  77
  78        if (ppc_md.progress)
  79                ppc_md.progress("Linux/PPC "UTS_RELEASE"\n", 0);
  80}
  81
  82void __init amigaone_init_IRQ(void)
  83{
  84        struct device_node *pic, *np = NULL;
  85        const unsigned long *prop = NULL;
  86        unsigned long int_ack = 0;
  87
  88        /* Search for ISA interrupt controller. */
  89        pic = of_find_compatible_node(NULL, "interrupt-controller",
  90                                      "pnpPNP,000");
  91        BUG_ON(pic == NULL);
  92
  93        /* Look for interrupt acknowledge address in the PCI root node. */
  94        np = of_find_compatible_node(NULL, "pci", "mai-logic,articia-s");
  95        if (np) {
  96                prop = of_get_property(np, "8259-interrupt-acknowledge", NULL);
  97                if (prop)
  98                        int_ack = prop[0];
  99                of_node_put(np);
 100        }
 101
 102        if (int_ack == 0)
 103                printk(KERN_WARNING "Cannot find PCI interrupt acknowledge"
 104                       " address, polling\n");
 105
 106        i8259_init(pic, int_ack);
 107        ppc_md.get_irq = i8259_irq;
 108        irq_set_default_host(i8259_get_host());
 109}
 110
 111static int __init request_isa_regions(void)
 112{
 113        request_region(0x00, 0x20, "dma1");
 114        request_region(0x40, 0x20, "timer");
 115        request_region(0x80, 0x10, "dma page reg");
 116        request_region(0xc0, 0x20, "dma2");
 117
 118        return 0;
 119}
 120machine_device_initcall(amigaone, request_isa_regions);
 121
 122void __noreturn amigaone_restart(char *cmd)
 123{
 124        local_irq_disable();
 125
 126        /* Flush and disable caches. */
 127        __flush_disable_L1();
 128
 129        /* Set SRR0 to the reset vector and turn on MSR_IP. */
 130        mtspr(SPRN_SRR0, 0xfff00100);
 131        mtspr(SPRN_SRR1, MSR_IP);
 132
 133        /* Do an rfi to jump back to firmware. */
 134        __asm__ __volatile__("rfi" : : : "memory");
 135
 136        /* Not reached. */
 137        while (1);
 138}
 139
 140static int __init amigaone_probe(void)
 141{
 142        if (of_machine_is_compatible("eyetech,amigaone")) {
 143                /*
 144                 * Coherent memory access cause complete system lockup! Thus
 145                 * disable this CPU feature, even if the CPU needs it.
 146                 */
 147                cur_cpu_spec->cpu_features &= ~CPU_FTR_NEED_COHERENT;
 148
 149                ISA_DMA_THRESHOLD = 0x00ffffff;
 150                DMA_MODE_READ = 0x44;
 151                DMA_MODE_WRITE = 0x48;
 152
 153                return 1;
 154        }
 155
 156        return 0;
 157}
 158
 159define_machine(amigaone) {
 160        .name                   = "AmigaOne",
 161        .probe                  = amigaone_probe,
 162        .setup_arch             = amigaone_setup_arch,
 163        .show_cpuinfo           = amigaone_show_cpuinfo,
 164        .init_IRQ               = amigaone_init_IRQ,
 165        .restart                = amigaone_restart,
 166        .calibrate_decr         = generic_calibrate_decr,
 167        .progress               = udbg_progress,
 168};
 169