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/irqdomain.h> 12 #include <linux/kernel.h> 13 #include <linux/of.h> 14 #include <linux/of_address.h> 15 #include <linux/seq_file.h> 16 #include <generated/utsrelease.h> 17 18 #include <asm/machdep.h> 19 #include <asm/cputable.h> 20 #include <asm/pci-bridge.h> 21 #include <asm/i8259.h> 22 #include <asm/time.h> 23 #include <asm/udbg.h> 24 #include <asm/dma.h> 25 26 extern void __flush_disable_L1(void); 27 28 void amigaone_show_cpuinfo(struct seq_file *m) 29 { 30 seq_printf(m, "vendor\t\t: Eyetech Ltd.\n"); 31 } 32 33 static int __init amigaone_add_bridge(struct device_node *dev) 34 { 35 const u32 *cfg_addr, *cfg_data; 36 int len; 37 const int *bus_range; 38 struct pci_controller *hose; 39 40 printk(KERN_INFO "Adding PCI host bridge %pOF\n", dev); 41 42 cfg_addr = of_get_address(dev, 0, NULL, NULL); 43 cfg_data = of_get_address(dev, 1, NULL, NULL); 44 if ((cfg_addr == NULL) || (cfg_data == NULL)) 45 return -ENODEV; 46 47 bus_range = of_get_property(dev, "bus-range", &len); 48 if ((bus_range == NULL) || (len < 2 * sizeof(int))) 49 printk(KERN_WARNING "Can't get bus-range for %pOF, assume" 50 " bus 0\n", dev); 51 52 hose = pcibios_alloc_controller(dev); 53 if (hose == NULL) 54 return -ENOMEM; 55 56 hose->first_busno = bus_range ? bus_range[0] : 0; 57 hose->last_busno = bus_range ? bus_range[1] : 0xff; 58 59 setup_indirect_pci(hose, cfg_addr[0], cfg_data[0], 0); 60 61 /* Interpret the "ranges" property */ 62 /* This also maps the I/O region and sets isa_io/mem_base */ 63 pci_process_bridge_OF_ranges(hose, dev, 1); 64 65 return 0; 66 } 67 68 void __init amigaone_setup_arch(void) 69 { 70 if (ppc_md.progress) 71 ppc_md.progress("Linux/PPC "UTS_RELEASE"\n", 0); 72 } 73 74 static void __init amigaone_discover_phbs(void) 75 { 76 struct device_node *np; 77 int phb = -ENODEV; 78 79 /* Lookup PCI host bridges. */ 80 for_each_compatible_node(np, "pci", "mai-logic,articia-s") 81 phb = amigaone_add_bridge(np); 82 83 BUG_ON(phb != 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 /* 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 define_machine(amigaone) { 159 .name = "AmigaOne", 160 .compatible = "eyetech,amigaone", 161 .probe = amigaone_probe, 162 .setup_arch = amigaone_setup_arch, 163 .discover_phbs = amigaone_discover_phbs, 164 .show_cpuinfo = amigaone_show_cpuinfo, 165 .init_IRQ = amigaone_init_IRQ, 166 .restart = amigaone_restart, 167 .progress = udbg_progress, 168 }; 169