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
  25 extern void __flush_disable_L1(void);
  26
  27 void amigaone_show_cpuinfo(struct seq_file *m)
  28 {
  29         seq_printf(m, "vendor\t\t: Eyetech Ltd.\n");
  30 }
  31
  32 static 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
  67 void __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
  82 void __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
 111 static 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 }
 120 machine_device_initcall(amigaone, request_isa_regions);
 121
 122 void __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
 140 static 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
 159 define_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 };