1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * PPC476 board specific routines 4 * 5 * Copyright 2010 Torez Smith, IBM Corporation. 6 * 7 * Based on earlier code: 8 * Matt Porter <mporter@kernel.crashing.org> 9 * Copyright 2002-2005 MontaVista Software Inc. 10 * 11 * Eugene Surovegin <eugene.surovegin@zultys.com> or <ebs@ebshome.net> 12 * Copyright (c) 2003-2005 Zultys Technologies 13 * 14 * Rewritten and ported to the merged powerpc tree: 15 * Copyright 2007 David Gibson <dwg@au1.ibm.com>, IBM Corporation. 16 */ 17 18 #include <linux/init.h> 19 #include <linux/of_platform.h> 20 #include <linux/rtc.h> 21 22 #include <asm/machdep.h> 23 #include <asm/prom.h> 24 #include <asm/udbg.h> 25 #include <asm/time.h> 26 #include <asm/uic.h> 27 #include <asm/ppc4xx.h> 28 #include <asm/mpic.h> 29 #include <asm/mmu.h> 30 31 static const struct of_device_id iss4xx_of_bus[] __initconst = { 32 { .compatible = "ibm,plb4", }, 33 { .compatible = "ibm,plb6", }, 34 { .compatible = "ibm,opb", }, 35 { .compatible = "ibm,ebc", }, 36 {}, 37 }; 38 39 static int __init iss4xx_device_probe(void) 40 { 41 of_platform_bus_probe(NULL, iss4xx_of_bus, NULL); 42 of_instantiate_rtc(); 43 44 return 0; 45 } 46 machine_device_initcall(iss4xx, iss4xx_device_probe); 47 48 /* We can have either UICs or MPICs */ 49 static void __init iss4xx_init_irq(void) 50 { 51 struct device_node *np; 52 53 /* Find top level interrupt controller */ 54 for_each_node_with_property(np, "interrupt-controller") { 55 if (of_get_property(np, "interrupts", NULL) == NULL) 56 break; 57 } 58 if (np == NULL) 59 panic("Can't find top level interrupt controller"); 60 61 /* Check type and do appropriate initialization */ 62 if (of_device_is_compatible(np, "ibm,uic")) { 63 uic_init_tree(); 64 ppc_md.get_irq = uic_get_irq; 65 #ifdef CONFIG_MPIC 66 } else if (of_device_is_compatible(np, "chrp,open-pic")) { 67 /* The MPIC driver will get everything it needs from the 68 * device-tree, just pass 0 to all arguments 69 */ 70 struct mpic *mpic = mpic_alloc(np, 0, MPIC_NO_RESET, 0, 0, " MPIC "); 71 BUG_ON(mpic == NULL); 72 mpic_init(mpic); 73 ppc_md.get_irq = mpic_get_irq; 74 #endif 75 } else 76 panic("Unrecognized top level interrupt controller"); 77 } 78 79 #ifdef CONFIG_SMP 80 static void smp_iss4xx_setup_cpu(int cpu) 81 { 82 mpic_setup_this_cpu(); 83 } 84 85 static int smp_iss4xx_kick_cpu(int cpu) 86 { 87 struct device_node *cpunode = of_get_cpu_node(cpu, NULL); 88 const u64 *spin_table_addr_prop; 89 u32 *spin_table; 90 extern void start_secondary_47x(void); 91 92 BUG_ON(cpunode == NULL); 93 94 /* Assume spin table. We could test for the enable-method in 95 * the device-tree but currently there's little point as it's 96 * our only supported method 97 */ 98 spin_table_addr_prop = of_get_property(cpunode, "cpu-release-addr", 99 NULL); 100 if (spin_table_addr_prop == NULL) { 101 pr_err("CPU%d: Can't start, missing cpu-release-addr !\n", cpu); 102 return -ENOENT; 103 } 104 105 /* Assume it's mapped as part of the linear mapping. This is a bit 106 * fishy but will work fine for now 107 */ 108 spin_table = (u32 *)__va(*spin_table_addr_prop); 109 pr_debug("CPU%d: Spin table mapped at %p\n", cpu, spin_table); 110 111 spin_table[3] = cpu; 112 smp_wmb(); 113 spin_table[1] = __pa(start_secondary_47x); 114 mb(); 115 116 return 0; 117 } 118 119 static struct smp_ops_t iss_smp_ops = { 120 .probe = smp_mpic_probe, 121 .message_pass = smp_mpic_message_pass, 122 .setup_cpu = smp_iss4xx_setup_cpu, 123 .kick_cpu = smp_iss4xx_kick_cpu, 124 .give_timebase = smp_generic_give_timebase, 125 .take_timebase = smp_generic_take_timebase, 126 }; 127 128 static void __init iss4xx_smp_init(void) 129 { 130 if (mmu_has_feature(MMU_FTR_TYPE_47x)) 131 smp_ops = &iss_smp_ops; 132 } 133 134 #else /* CONFIG_SMP */ 135 static void __init iss4xx_smp_init(void) { } 136 #endif /* CONFIG_SMP */ 137 138 static void __init iss4xx_setup_arch(void) 139 { 140 iss4xx_smp_init(); 141 } 142 143 /* 144 * Called very early, MMU is off, device-tree isn't unflattened 145 */ 146 static int __init iss4xx_probe(void) 147 { 148 if (!of_machine_is_compatible("ibm,iss-4xx")) 149 return 0; 150 151 return 1; 152 } 153 154 define_machine(iss4xx) { 155 .name = "ISS-4xx", 156 .probe = iss4xx_probe, 157 .progress = udbg_progress, 158 .init_IRQ = iss4xx_init_irq, 159 .setup_arch = iss4xx_setup_arch, 160 .restart = ppc4xx_reset_system, 161 .calibrate_decr = generic_calibrate_decr, 162 }; 163