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 28extern void __flush_disable_L1(void); 29 30void amigaone_show_cpuinfo(struct seq_file *m) 31{ 32 seq_printf(m, "vendor\t\t: Eyetech Ltd.\n"); 33} 34 35static int __init amigaone_add_bridge(struct device_node *dev) 36{ 37 const u32 *cfg_addr, *cfg_data; 38 int len; 39 const int *bus_range; 40 struct pci_controller *hose; 41 42 printk(KERN_INFO "Adding PCI host bridge %s\n", dev->full_name); 43 44 cfg_addr = of_get_address(dev, 0, NULL, NULL); 45 cfg_data = of_get_address(dev, 1, NULL, NULL); 46 if ((cfg_addr == NULL) || (cfg_data == NULL)) 47 return -ENODEV; 48 49 bus_range = of_get_property(dev, "bus-range", &len); 50 if ((bus_range == NULL) || (len < 2 * sizeof(int))) 51 printk(KERN_WARNING "Can't get bus-range for %s, assume" 52 " bus 0\n", dev->full_name); 53 54 hose = pcibios_alloc_controller(dev); 55 if (hose == NULL) 56 return -ENOMEM; 57 58 hose->first_busno = bus_range ? bus_range[0] : 0; 59 hose->last_busno = bus_range ? bus_range[1] : 0xff; 60 61 setup_indirect_pci(hose, cfg_addr[0], cfg_data[0], 0); 62 63 /* Interpret the "ranges" property */ 64 /* This also maps the I/O region and sets isa_io/mem_base */ 65 pci_process_bridge_OF_ranges(hose, dev, 1); 66 67 return 0; 68} 69 70void __init amigaone_setup_arch(void) 71{ 72 struct device_node *np; 73 int phb = -ENODEV; 74 75 /* Lookup PCI host bridges. */ 76 for_each_compatible_node(np, "pci", "mai-logic,articia-s") 77 phb = amigaone_add_bridge(np); 78 79 BUG_ON(phb != 0); 80 81 if (ppc_md.progress) 82 ppc_md.progress("Linux/PPC "UTS_RELEASE"\n", 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 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 unsigned long root = of_get_flat_dt_root(); 146 147 if (of_flat_dt_is_compatible(root, "eyetech,amigaone")) { 148 /* 149 * Coherent memory access cause complete system lockup! Thus 150 * disable this CPU feature, even if the CPU needs it. 151 */ 152 cur_cpu_spec->cpu_features &= ~CPU_FTR_NEED_COHERENT; 153 154 ISA_DMA_THRESHOLD = 0x00ffffff; 155 DMA_MODE_READ = 0x44; 156 DMA_MODE_WRITE = 0x48; 157 158 return 1; 159 } 160 161 return 0; 162} 163 164define_machine(amigaone) { 165 .name = "AmigaOne", 166 .probe = amigaone_probe, 167 .setup_arch = amigaone_setup_arch, 168 .show_cpuinfo = amigaone_show_cpuinfo, 169 .init_IRQ = amigaone_init_IRQ, 170 .restart = amigaone_restart, 171 .calibrate_decr = generic_calibrate_decr, 172 .progress = udbg_progress, 173}; 174