1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Generic PowerPC 44x platform support 4 * 5 * Copyright 2008 IBM Corporation 6 * 7 * This implements simple platform support for PowerPC 44x chips. This is 8 * mostly used for eval boards or other simple and "generic" 44x boards. If 9 * your board has custom functions or hardware, then you will likely want to 10 * implement your own board.c file to accommodate it. 11 */ 12 13 #include <asm/machdep.h> 14 #include <asm/pci-bridge.h> 15 #include <asm/ppc4xx.h> 16 #include <asm/prom.h> 17 #include <asm/time.h> 18 #include <asm/udbg.h> 19 #include <asm/uic.h> 20 21 #include <linux/init.h> 22 #include <linux/of_platform.h> 23 24 static const struct of_device_id ppc44x_of_bus[] __initconst = { 25 { .compatible = "ibm,plb4", }, 26 { .compatible = "ibm,opb", }, 27 { .compatible = "ibm,ebc", }, 28 { .compatible = "simple-bus", }, 29 {}, 30 }; 31 32 static int __init ppc44x_device_probe(void) 33 { 34 of_platform_bus_probe(NULL, ppc44x_of_bus, NULL); 35 36 return 0; 37 } 38 machine_device_initcall(ppc44x_simple, ppc44x_device_probe); 39 40 /* This is the list of boards that can be supported by this simple 41 * platform code. This does _not_ mean the boards are compatible, 42 * as they most certainly are not from a device tree perspective. 43 * However, their differences are handled by the device tree and the 44 * drivers and therefore they don't need custom board support files. 45 * 46 * Again, if your board needs to do things differently then create a 47 * board.c file for it rather than adding it to this list. 48 */ 49 static char *board[] __initdata = { 50 "amcc,arches", 51 "amcc,bamboo", 52 "apm,bluestone", 53 "amcc,glacier", 54 "ibm,ebony", 55 "amcc,eiger", 56 "amcc,katmai", 57 "amcc,rainier", 58 "amcc,redwood", 59 "amcc,sequoia", 60 "amcc,taishan", 61 "amcc,yosemite", 62 "mosaixtech,icon" 63 }; 64 65 static int __init ppc44x_probe(void) 66 { 67 int i = 0; 68 69 for (i = 0; i < ARRAY_SIZE(board); i++) { 70 if (of_machine_is_compatible(board[i])) { 71 pci_set_flags(PCI_REASSIGN_ALL_RSRC); 72 return 1; 73 } 74 } 75 76 return 0; 77 } 78 79 define_machine(ppc44x_simple) { 80 .name = "PowerPC 44x Platform", 81 .probe = ppc44x_probe, 82 .progress = udbg_progress, 83 .init_IRQ = uic_init_tree, 84 .get_irq = uic_get_irq, 85 .restart = ppc4xx_reset_system, 86 .calibrate_decr = generic_calibrate_decr, 87 }; 88