1/* 2 * Currituck board specific routines 3 * 4 * Copyright © 2011 Tony Breeds 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 * Copyright © 2011 David Kliekamp IBM Corporation 16 * 17 * This program is free software; you can redistribute it and/or modify it 18 * under the terms of the GNU General Public License as published by the 19 * Free Software Foundation; either version 2 of the License, or (at your 20 * option) any later version. 21 */ 22 23#include <linux/init.h> 24#include <linux/memblock.h> 25#include <linux/of.h> 26#include <linux/of_platform.h> 27#include <linux/rtc.h> 28 29#include <asm/machdep.h> 30#include <asm/prom.h> 31#include <asm/udbg.h> 32#include <asm/time.h> 33#include <asm/uic.h> 34#include <asm/ppc4xx.h> 35#include <asm/mpic.h> 36#include <asm/mmu.h> 37 38#include <linux/pci.h> 39 40static __initdata struct of_device_id ppc47x_of_bus[] = { 41 { .compatible = "ibm,plb4", }, 42 { .compatible = "ibm,plb6", }, 43 { .compatible = "ibm,opb", }, 44 { .compatible = "ibm,ebc", }, 45 {}, 46}; 47 48/* The EEPROM is missing and the default values are bogus. This forces USB in 49 * to EHCI mode */ 50static void __devinit quirk_ppc_currituck_usb_fixup(struct pci_dev *dev) 51{ 52 if (of_machine_is_compatible("ibm,currituck")) { 53 pci_write_config_dword(dev, 0xe0, 0x0114231f); 54 pci_write_config_dword(dev, 0xe4, 0x00006c40); 55 } 56} 57DECLARE_PCI_FIXUP_HEADER(0x1033, 0x0035, quirk_ppc_currituck_usb_fixup); 58 59static int __init ppc47x_device_probe(void) 60{ 61 of_platform_bus_probe(NULL, ppc47x_of_bus, NULL); 62 63 return 0; 64} 65machine_device_initcall(ppc47x, ppc47x_device_probe); 66 67/* We can have either UICs or MPICs */ 68static void __init ppc47x_init_irq(void) 69{ 70 struct device_node *np; 71 72 /* Find top level interrupt controller */ 73 for_each_node_with_property(np, "interrupt-controller") { 74 if (of_get_property(np, "interrupts", NULL) == NULL) 75 break; 76 } 77 if (np == NULL) 78 panic("Can't find top level interrupt controller"); 79 80 /* Check type and do appropriate initialization */ 81 if (of_device_is_compatible(np, "chrp,open-pic")) { 82 /* The MPIC driver will get everything it needs from the 83 * device-tree, just pass 0 to all arguments 84 */ 85 struct mpic *mpic = 86 mpic_alloc(np, 0, MPIC_NO_RESET, 0, 0, " MPIC "); 87 BUG_ON(mpic == NULL); 88 mpic_init(mpic); 89 ppc_md.get_irq = mpic_get_irq; 90 } else 91 panic("Unrecognized top level interrupt controller"); 92} 93 94#ifdef CONFIG_SMP 95static void __cpuinit smp_ppc47x_setup_cpu(int cpu) 96{ 97 mpic_setup_this_cpu(); 98} 99 100static int __cpuinit smp_ppc47x_kick_cpu(int cpu) 101{ 102 struct device_node *cpunode = of_get_cpu_node(cpu, NULL); 103 const u64 *spin_table_addr_prop; 104 u32 *spin_table; 105 extern void start_secondary_47x(void); 106 107 BUG_ON(cpunode == NULL); 108 109 /* Assume spin table. We could test for the enable-method in 110 * the device-tree but currently there's little point as it's 111 * our only supported method 112 */ 113 spin_table_addr_prop = 114 of_get_property(cpunode, "cpu-release-addr", NULL); 115 116 if (spin_table_addr_prop == NULL) { 117 pr_err("CPU%d: Can't start, missing cpu-release-addr !\n", 118 cpu); 119 return 1; 120 } 121 122 /* Assume it's mapped as part of the linear mapping. This is a bit 123 * fishy but will work fine for now 124 * 125 * XXX: Is there any reason to assume differently? 126 */ 127 spin_table = (u32 *)__va(*spin_table_addr_prop); 128 pr_debug("CPU%d: Spin table mapped at %p\n", cpu, spin_table); 129 130 spin_table[3] = cpu; 131 smp_wmb(); 132 spin_table[1] = __pa(start_secondary_47x); 133 mb(); 134 135 return 0; 136} 137 138static struct smp_ops_t ppc47x_smp_ops = { 139 .probe = smp_mpic_probe, 140 .message_pass = smp_mpic_message_pass, 141 .setup_cpu = smp_ppc47x_setup_cpu, 142 .kick_cpu = smp_ppc47x_kick_cpu, 143 .give_timebase = smp_generic_give_timebase, 144 .take_timebase = smp_generic_take_timebase, 145}; 146 147static void __init ppc47x_smp_init(void) 148{ 149 if (mmu_has_feature(MMU_FTR_TYPE_47x)) 150 smp_ops = &ppc47x_smp_ops; 151} 152 153#else /* CONFIG_SMP */ 154static void __init ppc47x_smp_init(void) { } 155#endif /* CONFIG_SMP */ 156 157static void __init ppc47x_setup_arch(void) 158{ 159 160 /* No need to check the DMA config as we /know/ our windows are all of 161 * RAM. Lets hope that doesn't change */ 162#ifdef CONFIG_SWIOTLB 163 if (memblock_end_of_DRAM() > 0xffffffff) { 164 ppc_swiotlb_enable = 1; 165 set_pci_dma_ops(&swiotlb_dma_ops); 166 ppc_md.pci_dma_dev_setup = pci_dma_dev_setup_swiotlb; 167 } 168#endif 169 ppc47x_smp_init(); 170} 171 172/* 173 * Called very early, MMU is off, device-tree isn't unflattened 174 */ 175static int __init ppc47x_probe(void) 176{ 177 unsigned long root = of_get_flat_dt_root(); 178 179 if (!of_flat_dt_is_compatible(root, "ibm,currituck")) 180 return 0; 181 182 return 1; 183} 184 185/* Use USB controller should have been hardware swizzled but it wasn't :( */ 186static void ppc47x_pci_irq_fixup(struct pci_dev *dev) 187{ 188 if (dev->vendor == 0x1033 && (dev->device == 0x0035 || 189 dev->device == 0x00e0)) { 190 dev->irq = irq_create_mapping(NULL, 47); 191 pr_info("%s: Mapping irq 47 %d\n", __func__, dev->irq); 192 } 193} 194 195define_machine(ppc47x) { 196 .name = "PowerPC 47x", 197 .probe = ppc47x_probe, 198 .progress = udbg_progress, 199 .init_IRQ = ppc47x_init_irq, 200 .setup_arch = ppc47x_setup_arch, 201 .pci_irq_fixup = ppc47x_pci_irq_fixup, 202 .restart = ppc4xx_reset_system, 203 .calibrate_decr = generic_calibrate_decr, 204}; 205