linux/arch/powerpc/platforms/embedded6xx/mpc7448_hpc2.c
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   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/module.h>
  27#include <linux/delay.h>
  28#include <linux/irq.h>
  29#include <linux/seq_file.h>
  30#include <linux/root_dev.h>
  31#include <linux/serial.h>
  32#include <linux/tty.h>
  33#include <linux/serial_core.h>
  34
  35#include <asm/system.h>
  36#include <asm/time.h>
  37#include <asm/machdep.h>
  38#include <asm/prom.h>
  39#include <asm/udbg.h>
  40#include <asm/tsi108.h>
  41#include <asm/pci-bridge.h>
  42#include <asm/reg.h>
  43#include <mm/mmu_decl.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
  57int mpc7448_hpc2_exclude_device(struct pci_controller *hose,
  58                                u_char bus, u_char devfn)
  59{
  60        if (bus == 0 && PCI_SLOT(devfn) == 0)
  61                return PCIBIOS_DEVICE_NOT_FOUND;
  62        else
  63                return PCIBIOS_SUCCESSFUL;
  64}
  65
  66static void __init mpc7448_hpc2_setup_arch(void)
  67{
  68        struct device_node *np;
  69        if (ppc_md.progress)
  70                ppc_md.progress("mpc7448_hpc2_setup_arch():set_bridge", 0);
  71
  72        tsi108_csr_vir_base = get_vir_csrbase();
  73
  74        /* setup PCI host bridge */
  75#ifdef CONFIG_PCI
  76        for_each_compatible_node(np, "pci", "tsi108-pci")
  77                tsi108_setup_pci(np, MPC7448HPC2_PCI_CFG_PHYS, 0);
  78
  79        ppc_md.pci_exclude_device = mpc7448_hpc2_exclude_device;
  80        if (ppc_md.progress)
  81                ppc_md.progress("tsi108: resources set", 0x100);
  82#endif
  83
  84        printk(KERN_INFO "MPC7448HPC2 (TAIGA) Platform\n");
  85        printk(KERN_INFO
  86               "Jointly ported by Freescale and Tundra Semiconductor\n");
  87        printk(KERN_INFO
  88               "Enabling L2 cache then enabling the HID0 prefetch engine.\n");
  89}
  90
  91/*
  92 * Interrupt setup and service.  Interrupts on the mpc7448_hpc2 come
  93 * from the four external INT pins, PCI interrupts are routed via
  94 * PCI interrupt control registers, it generates internal IRQ23
  95 *
  96 * Interrupt routing on the Taiga Board:
  97 * TSI108:PB_INT[0] -> CPU0:INT#
  98 * TSI108:PB_INT[1] -> CPU0:MCP#
  99 * TSI108:PB_INT[2] -> N/C
 100 * TSI108:PB_INT[3] -> N/C
 101 */
 102static void __init mpc7448_hpc2_init_IRQ(void)
 103{
 104        struct mpic *mpic;
 105#ifdef CONFIG_PCI
 106        unsigned int cascade_pci_irq;
 107        struct device_node *tsi_pci;
 108        struct device_node *cascade_node = NULL;
 109#endif
 110
 111        mpic = mpic_alloc(NULL, 0,
 112                        MPIC_BIG_ENDIAN | MPIC_WANTS_RESET |
 113                        MPIC_SPV_EOI | MPIC_NO_PTHROU_DIS | MPIC_REGSET_TSI108,
 114                        24,
 115                        NR_IRQS-4, /* num_sources used */
 116                        "Tsi108_PIC");
 117
 118        BUG_ON(mpic == NULL);
 119
 120        mpic_assign_isu(mpic, 0, mpic->paddr + 0x100);
 121
 122        mpic_init(mpic);
 123
 124#ifdef CONFIG_PCI
 125        tsi_pci = of_find_node_by_type(NULL, "pci");
 126        if (tsi_pci == NULL) {
 127                printk("%s: No tsi108 pci node found !\n", __func__);
 128                return;
 129        }
 130        cascade_node = of_find_node_by_type(NULL, "pic-router");
 131        if (cascade_node == NULL) {
 132                printk("%s: No tsi108 pci cascade node found !\n", __func__);
 133                return;
 134        }
 135
 136        cascade_pci_irq = irq_of_parse_and_map(tsi_pci, 0);
 137        DBG("%s: tsi108 cascade_pci_irq = 0x%x\n", __func__,
 138            (u32) cascade_pci_irq);
 139        tsi108_pci_int_init(cascade_node);
 140        irq_set_handler_data(cascade_pci_irq, mpic);
 141        irq_set_chained_handler(cascade_pci_irq, tsi108_irq_cascade);
 142#endif
 143        /* Configure MPIC outputs to CPU0 */
 144        tsi108_write_reg(TSI108_MPIC_OFFSET + 0x30c, 0);
 145}
 146
 147void mpc7448_hpc2_show_cpuinfo(struct seq_file *m)
 148{
 149        seq_printf(m, "vendor\t\t: Freescale Semiconductor\n");
 150}
 151
 152void mpc7448_hpc2_restart(char *cmd)
 153{
 154        local_irq_disable();
 155
 156        /* Set exception prefix high - to the firmware */
 157        _nmask_and_or_msr(0, MSR_IP);
 158
 159        for (;;) ;              /* Spin until reset happens */
 160}
 161
 162void mpc7448_hpc2_power_off(void)
 163{
 164        local_irq_disable();
 165        for (;;) ;              /* No way to shut power off with software */
 166}
 167
 168void mpc7448_hpc2_halt(void)
 169{
 170        mpc7448_hpc2_power_off();
 171}
 172
 173/*
 174 * Called very early, device-tree isn't unflattened
 175 */
 176static int __init mpc7448_hpc2_probe(void)
 177{
 178        unsigned long root = of_get_flat_dt_root();
 179
 180        if (!of_flat_dt_is_compatible(root, "mpc74xx"))
 181                return 0;
 182        return 1;
 183}
 184
 185static int mpc7448_machine_check_exception(struct pt_regs *regs)
 186{
 187        const struct exception_table_entry *entry;
 188
 189        /* Are we prepared to handle this fault */
 190        if ((entry = search_exception_tables(regs->nip)) != NULL) {
 191                tsi108_clear_pci_cfg_error();
 192                regs->msr |= MSR_RI;
 193                regs->nip = entry->fixup;
 194                return 1;
 195        }
 196        return 0;
 197}
 198
 199define_machine(mpc7448_hpc2){
 200        .name                   = "MPC7448 HPC2",
 201        .probe                  = mpc7448_hpc2_probe,
 202        .setup_arch             = mpc7448_hpc2_setup_arch,
 203        .init_IRQ               = mpc7448_hpc2_init_IRQ,
 204        .show_cpuinfo           = mpc7448_hpc2_show_cpuinfo,
 205        .get_irq                = mpic_get_irq,
 206        .restart                = mpc7448_hpc2_restart,
 207        .calibrate_decr         = generic_calibrate_decr,
 208        .machine_check_exception= mpc7448_machine_check_exception,
 209        .progress               = udbg_progress,
 210};
 211