1 /* 2 * PPC476 board specific routines 3 * 4 * Copyright 2010 Torez Smith, IBM Corporation. 5 * 6 * Based on earlier code: 7 * Matt Porter <mporter@kernel.crashing.org> 8 * Copyright 2002-2005 MontaVista Software Inc. 9 * 10 * Eugene Surovegin <eugene.surovegin@zultys.com> or <ebs@ebshome.net> 11 * Copyright (c) 2003-2005 Zultys Technologies 12 * 13 * Rewritten and ported to the merged powerpc tree: 14 * Copyright 2007 David Gibson <dwg@au1.ibm.com>, IBM Corporation. 15 * 16 * This program is free software; you can redistribute it and/or modify it 17 * under the terms of the GNU General Public License as published by the 18 * Free Software Foundation; either version 2 of the License, or (at your 19 * option) any later version. 20 */ 21 22 #include <linux/init.h> 23 #include <linux/of_platform.h> 24 #include <linux/rtc.h> 25 26 #include <asm/machdep.h> 27 #include <asm/prom.h> 28 #include <asm/udbg.h> 29 #include <asm/time.h> 30 #include <asm/uic.h> 31 #include <asm/ppc4xx.h> 32 #include <asm/mpic.h> 33 #include <asm/mmu.h> 34 35 static __initdata struct of_device_id iss4xx_of_bus[] = { 36 { .compatible = "ibm,plb4", }, 37 { .compatible = "ibm,plb6", }, 38 { .compatible = "ibm,opb", }, 39 { .compatible = "ibm,ebc", }, 40 {}, 41 }; 42 43 static int __init iss4xx_device_probe(void) 44 { 45 of_platform_bus_probe(NULL, iss4xx_of_bus, NULL); 46 of_instantiate_rtc(); 47 48 return 0; 49 } 50 machine_device_initcall(iss4xx, iss4xx_device_probe); 51 52 /* We can have either UICs or MPICs */ 53 static void __init iss4xx_init_irq(void) 54 { 55 struct device_node *np; 56 57 /* Find top level interrupt controller */ 58 for_each_node_with_property(np, "interrupt-controller") { 59 if (of_get_property(np, "interrupts", NULL) == NULL) 60 break; 61 } 62 if (np == NULL) 63 panic("Can't find top level interrupt controller"); 64 65 /* Check type and do appropriate initialization */ 66 if (of_device_is_compatible(np, "ibm,uic")) { 67 uic_init_tree(); 68 ppc_md.get_irq = uic_get_irq; 69 #ifdef CONFIG_MPIC 70 } else if (of_device_is_compatible(np, "chrp,open-pic")) { 71 /* The MPIC driver will get everything it needs from the 72 * device-tree, just pass 0 to all arguments 73 */ 74 struct mpic *mpic = mpic_alloc(np, 0, 0, 0, 0, 75 " MPIC "); 76 BUG_ON(mpic == NULL); 77 mpic_init(mpic); 78 ppc_md.get_irq = mpic_get_irq; 79 #endif 80 } else 81 panic("Unrecognized top level interrupt controller"); 82 } 83 84 #ifdef CONFIG_SMP 85 static void __cpuinit smp_iss4xx_setup_cpu(int cpu) 86 { 87 mpic_setup_this_cpu(); 88 } 89 90 static int __cpuinit smp_iss4xx_kick_cpu(int cpu) 91 { 92 struct device_node *cpunode = of_get_cpu_node(cpu, NULL); 93 const u64 *spin_table_addr_prop; 94 u32 *spin_table; 95 extern void start_secondary_47x(void); 96 97 BUG_ON(cpunode == NULL); 98 99 /* Assume spin table. We could test for the enable-method in 100 * the device-tree but currently there's little point as it's 101 * our only supported method 102 */ 103 spin_table_addr_prop = of_get_property(cpunode, "cpu-release-addr", 104 NULL); 105 if (spin_table_addr_prop == NULL) { 106 pr_err("CPU%d: Can't start, missing cpu-release-addr !\n", cpu); 107 return -ENOENT; 108 } 109 110 /* Assume it's mapped as part of the linear mapping. This is a bit 111 * fishy but will work fine for now 112 */ 113 spin_table = (u32 *)__va(*spin_table_addr_prop); 114 pr_debug("CPU%d: Spin table mapped at %p\n", cpu, spin_table); 115 116 spin_table[3] = cpu; 117 smp_wmb(); 118 spin_table[1] = __pa(start_secondary_47x); 119 mb(); 120 121 return 0; 122 } 123 124 static struct smp_ops_t iss_smp_ops = { 125 .probe = smp_mpic_probe, 126 .message_pass = smp_mpic_message_pass, 127 .setup_cpu = smp_iss4xx_setup_cpu, 128 .kick_cpu = smp_iss4xx_kick_cpu, 129 .give_timebase = smp_generic_give_timebase, 130 .take_timebase = smp_generic_take_timebase, 131 }; 132 133 static void __init iss4xx_smp_init(void) 134 { 135 if (mmu_has_feature(MMU_FTR_TYPE_47x)) 136 smp_ops = &iss_smp_ops; 137 } 138 139 #else /* CONFIG_SMP */ 140 static void __init iss4xx_smp_init(void) { } 141 #endif /* CONFIG_SMP */ 142 143 static void __init iss4xx_setup_arch(void) 144 { 145 iss4xx_smp_init(); 146 } 147 148 /* 149 * Called very early, MMU is off, device-tree isn't unflattened 150 */ 151 static int __init iss4xx_probe(void) 152 { 153 unsigned long root = of_get_flat_dt_root(); 154 155 if (!of_flat_dt_is_compatible(root, "ibm,iss-4xx")) 156 return 0; 157 158 return 1; 159 } 160 161 define_machine(iss4xx) { 162 .name = "ISS-4xx", 163 .probe = iss4xx_probe, 164 .progress = udbg_progress, 165 .init_IRQ = iss4xx_init_irq, 166 .setup_arch = iss4xx_setup_arch, 167 .restart = ppc4xx_reset_system, 168 .calibrate_decr = generic_calibrate_decr, 169 }; 170