1/* 2 * mpc7448_hpc2.c 3 * 4 * Board setup routines for the Freescale mpc7448hpc2(taiga) platform 5 * 6 * Author: Jacob Pan 7 * jacob.pan@freescale.com 8 * Author: Xianghua Xiao 9 * x.xiao@freescale.com 10 * Maintainer: Roy Zang <tie-fei.zang@freescale.com> 11 * Add Flat Device Tree support fot mpc7448hpc2 board 12 * 13 * Copyright 2004-2006 Freescale Semiconductor, Inc. 14 * 15 * This program is free software; you can redistribute it and/or 16 * modify it under the terms of the GNU General Public License 17 * as published by the Free Software Foundation; either version 18 * 2 of the License, or (at your option) any later version. 19 */ 20 21#include <linux/stddef.h> 22#include <linux/kernel.h> 23#include <linux/pci.h> 24#include <linux/kdev_t.h> 25#include <linux/console.h> 26#include <linux/delay.h> 27#include <linux/irq.h> 28#include <linux/seq_file.h> 29#include <linux/root_dev.h> 30#include <linux/serial.h> 31#include <linux/tty.h> 32#include <linux/serial_core.h> 33 34#include <asm/system.h> 35#include <asm/time.h> 36#include <asm/machdep.h> 37#include <asm/prom.h> 38#include <asm/udbg.h> 39#include <asm/tsi108.h> 40#include <asm/pci-bridge.h> 41#include <asm/reg.h> 42#include <mm/mmu_decl.h> 43#include "mpc7448_hpc2.h" 44#include <asm/tsi108_pci.h> 45#include <asm/tsi108_irq.h> 46#include <asm/mpic.h> 47 48#undef DEBUG 49#ifdef DEBUG 50#define DBG(fmt...) do { printk(fmt); } while(0) 51#else 52#define DBG(fmt...) do { } while(0) 53#endif 54 55#define MPC7448HPC2_PCI_CFG_PHYS 0xfb000000 56 57#ifndef CONFIG_PCI 58isa_io_base = MPC7448_HPC2_ISA_IO_BASE; 59isa_mem_base = MPC7448_HPC2_ISA_MEM_BASE; 60pci_dram_offset = MPC7448_HPC2_PCI_MEM_OFFSET; 61#endif 62 63extern void _nmask_and_or_msr(unsigned long nmask, unsigned long or_val); 64 65int mpc7448_hpc2_exclude_device(u_char bus, u_char devfn) 66{ 67 if (bus == 0 && PCI_SLOT(devfn) == 0) 68 return PCIBIOS_DEVICE_NOT_FOUND; 69 else 70 return PCIBIOS_SUCCESSFUL; 71} 72 73static void __init mpc7448_hpc2_setup_arch(void) 74{ 75 struct device_node *np; 76 if (ppc_md.progress) 77 ppc_md.progress("mpc7448_hpc2_setup_arch():set_bridge", 0); 78 79 tsi108_csr_vir_base = get_vir_csrbase(); 80 81 /* setup PCI host bridge */ 82#ifdef CONFIG_PCI 83 for (np = NULL; (np = of_find_node_by_type(np, "pci")) != NULL;) 84 tsi108_setup_pci(np, MPC7448HPC2_PCI_CFG_PHYS, 0); 85 86 ppc_md.pci_exclude_device = mpc7448_hpc2_exclude_device; 87 if (ppc_md.progress) 88 ppc_md.progress("tsi108: resources set", 0x100); 89#endif 90 91 printk(KERN_INFO "MPC7448HPC2 (TAIGA) Platform\n"); 92 printk(KERN_INFO 93 "Jointly ported by Freescale and Tundra Semiconductor\n"); 94 printk(KERN_INFO 95 "Enabling L2 cache then enabling the HID0 prefetch engine.\n"); 96} 97 98/* 99 * Interrupt setup and service. Interrrupts on the mpc7448_hpc2 come 100 * from the four external INT pins, PCI interrupts are routed via 101 * PCI interrupt control registers, it generates internal IRQ23 102 * 103 * Interrupt routing on the Taiga Board: 104 * TSI108:PB_INT[0] -> CPU0:INT# 105 * TSI108:PB_INT[1] -> CPU0:MCP# 106 * TSI108:PB_INT[2] -> N/C 107 * TSI108:PB_INT[3] -> N/C 108 */ 109static void __init mpc7448_hpc2_init_IRQ(void) 110{ 111 struct mpic *mpic; 112 phys_addr_t mpic_paddr = 0; 113 struct device_node *tsi_pic; 114#ifdef CONFIG_PCI 115 unsigned int cascade_pci_irq; 116 struct device_node *tsi_pci; 117 struct device_node *cascade_node = NULL; 118#endif 119 120 tsi_pic = of_find_node_by_type(NULL, "open-pic"); 121 if (tsi_pic) { 122 unsigned int size; 123 const void *prop = of_get_property(tsi_pic, "reg", &size); 124 mpic_paddr = of_translate_address(tsi_pic, prop); 125 } 126 127 if (mpic_paddr == 0) { 128 printk("%s: No tsi108 PIC found !\n", __FUNCTION__); 129 return; 130 } 131 132 DBG("%s: tsi108 pic phys_addr = 0x%x\n", __FUNCTION__, 133 (u32) mpic_paddr); 134 135 mpic = mpic_alloc(tsi_pic, mpic_paddr, 136 MPIC_PRIMARY | MPIC_BIG_ENDIAN | MPIC_WANTS_RESET | 137 MPIC_SPV_EOI | MPIC_NO_PTHROU_DIS | MPIC_REGSET_TSI108, 138 24, 139 NR_IRQS-4, /* num_sources used */ 140 "Tsi108_PIC"); 141 142 BUG_ON(mpic == NULL); 143 144 mpic_assign_isu(mpic, 0, mpic_paddr + 0x100); 145 146 mpic_init(mpic); 147 148#ifdef CONFIG_PCI 149 tsi_pci = of_find_node_by_type(NULL, "pci"); 150 if (tsi_pci == NULL) { 151 printk("%s: No tsi108 pci node found !\n", __FUNCTION__); 152 return; 153 } 154 cascade_node = of_find_node_by_type(NULL, "pic-router"); 155 if (cascade_node == NULL) { 156 printk("%s: No tsi108 pci cascade node found !\n", __FUNCTION__); 157 return; 158 } 159 160 cascade_pci_irq = irq_of_parse_and_map(tsi_pci, 0); 161 DBG("%s: tsi108 cascade_pci_irq = 0x%x\n", __FUNCTION__, 162 (u32) cascade_pci_irq); 163 tsi108_pci_int_init(cascade_node); 164 set_irq_data(cascade_pci_irq, mpic); 165 set_irq_chained_handler(cascade_pci_irq, tsi108_irq_cascade); 166#endif 167 /* Configure MPIC outputs to CPU0 */ 168 tsi108_write_reg(TSI108_MPIC_OFFSET + 0x30c, 0); 169 of_node_put(tsi_pic); 170} 171 172void mpc7448_hpc2_show_cpuinfo(struct seq_file *m) 173{ 174 seq_printf(m, "vendor\t\t: Freescale Semiconductor\n"); 175 seq_printf(m, "machine\t\t: MPC7448hpc2\n"); 176} 177 178void mpc7448_hpc2_restart(char *cmd) 179{ 180 local_irq_disable(); 181 182 /* Set exception prefix high - to the firmware */ 183 _nmask_and_or_msr(0, MSR_IP); 184 185 for (;;) ; /* Spin until reset happens */ 186} 187 188void mpc7448_hpc2_power_off(void) 189{ 190 local_irq_disable(); 191 for (;;) ; /* No way to shut power off with software */ 192} 193 194void mpc7448_hpc2_halt(void) 195{ 196 mpc7448_hpc2_power_off(); 197} 198 199/* 200 * Called very early, device-tree isn't unflattened 201 */ 202static int __init mpc7448_hpc2_probe(void) 203{ 204 unsigned long root = of_get_flat_dt_root(); 205 206 if (!of_flat_dt_is_compatible(root, "mpc74xx")) 207 return 0; 208 return 1; 209} 210 211static int mpc7448_machine_check_exception(struct pt_regs *regs) 212{ 213 const struct exception_table_entry *entry; 214 215 /* Are we prepared to handle this fault */ 216 if ((entry = search_exception_tables(regs->nip)) != NULL) { 217 tsi108_clear_pci_cfg_error(); 218 regs->msr |= MSR_RI; 219 regs->nip = entry->fixup; 220 return 1; 221 } 222 return 0; 223} 224 225define_machine(mpc7448_hpc2){ 226 .name = "MPC7448 HPC2", 227 .probe = mpc7448_hpc2_probe, 228 .setup_arch = mpc7448_hpc2_setup_arch, 229 .init_IRQ = mpc7448_hpc2_init_IRQ, 230 .show_cpuinfo = mpc7448_hpc2_show_cpuinfo, 231 .get_irq = mpic_get_irq, 232 .restart = mpc7448_hpc2_restart, 233 .calibrate_decr = generic_calibrate_decr, 234 .machine_check_exception= mpc7448_machine_check_exception, 235 .progress = udbg_progress, 236}; 237