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/extable.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/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 <asm/tsi108_pci.h>
  44#include <asm/tsi108_irq.h>
  45#include <asm/mpic.h>
  46
  47#undef DEBUG
  48#ifdef DEBUG
  49#define DBG(fmt...) do { printk(fmt); } while(0)
  50#else
  51#define DBG(fmt...) do { } while(0)
  52#endif
  53
  54#define MPC7448HPC2_PCI_CFG_PHYS 0xfb000000
  55
  56int mpc7448_hpc2_exclude_device(struct pci_controller *hose,
  57                                u_char bus, u_char devfn)
  58{
  59        if (bus == 0 && PCI_SLOT(devfn) == 0)
  60                return PCIBIOS_DEVICE_NOT_FOUND;
  61        else
  62                return PCIBIOS_SUCCESSFUL;
  63}
  64
  65static void __init mpc7448_hpc2_setup_arch(void)
  66{
  67        struct device_node *np;
  68        if (ppc_md.progress)
  69                ppc_md.progress("mpc7448_hpc2_setup_arch():set_bridge", 0);
  70
  71        tsi108_csr_vir_base = get_vir_csrbase();
  72
  73        /* setup PCI host bridge */
  74#ifdef CONFIG_PCI
  75        for_each_compatible_node(np, "pci", "tsi108-pci")
  76                tsi108_setup_pci(np, MPC7448HPC2_PCI_CFG_PHYS, 0);
  77
  78        ppc_md.pci_exclude_device = mpc7448_hpc2_exclude_device;
  79        if (ppc_md.progress)
  80                ppc_md.progress("tsi108: resources set", 0x100);
  81#endif
  82
  83        printk(KERN_INFO "MPC7448HPC2 (TAIGA) Platform\n");
  84        printk(KERN_INFO
  85               "Jointly ported by Freescale and Tundra Semiconductor\n");
  86        printk(KERN_INFO
  87               "Enabling L2 cache then enabling the HID0 prefetch engine.\n");
  88}
  89
  90/*
  91 * Interrupt setup and service.  Interrupts on the mpc7448_hpc2 come
  92 * from the four external INT pins, PCI interrupts are routed via
  93 * PCI interrupt control registers, it generates internal IRQ23
  94 *
  95 * Interrupt routing on the Taiga Board:
  96 * TSI108:PB_INT[0] -> CPU0:INT#
  97 * TSI108:PB_INT[1] -> CPU0:MCP#
  98 * TSI108:PB_INT[2] -> N/C
  99 * TSI108:PB_INT[3] -> N/C
 100 */
 101static void __init mpc7448_hpc2_init_IRQ(void)
 102{
 103        struct mpic *mpic;
 104#ifdef CONFIG_PCI
 105        unsigned int cascade_pci_irq;
 106        struct device_node *tsi_pci;
 107        struct device_node *cascade_node = NULL;
 108#endif
 109
 110        mpic = mpic_alloc(NULL, 0, MPIC_BIG_ENDIAN |
 111                        MPIC_SPV_EOI | MPIC_NO_PTHROU_DIS | MPIC_REGSET_TSI108,
 112                        24, 0,
 113                        "Tsi108_PIC");
 114
 115        BUG_ON(mpic == NULL);
 116
 117        mpic_assign_isu(mpic, 0, mpic->paddr + 0x100);
 118
 119        mpic_init(mpic);
 120
 121#ifdef CONFIG_PCI
 122        tsi_pci = of_find_node_by_type(NULL, "pci");
 123        if (tsi_pci == NULL) {
 124                printk("%s: No tsi108 pci node found !\n", __func__);
 125                return;
 126        }
 127        cascade_node = of_find_node_by_type(NULL, "pic-router");
 128        if (cascade_node == NULL) {
 129                printk("%s: No tsi108 pci cascade node found !\n", __func__);
 130                return;
 131        }
 132
 133        cascade_pci_irq = irq_of_parse_and_map(tsi_pci, 0);
 134        DBG("%s: tsi108 cascade_pci_irq = 0x%x\n", __func__,
 135            (u32) cascade_pci_irq);
 136        tsi108_pci_int_init(cascade_node);
 137        irq_set_handler_data(cascade_pci_irq, mpic);
 138        irq_set_chained_handler(cascade_pci_irq, tsi108_irq_cascade);
 139#endif
 140        /* Configure MPIC outputs to CPU0 */
 141        tsi108_write_reg(TSI108_MPIC_OFFSET + 0x30c, 0);
 142}
 143
 144void mpc7448_hpc2_show_cpuinfo(struct seq_file *m)
 145{
 146        seq_printf(m, "vendor\t\t: Freescale Semiconductor\n");
 147}
 148
 149static void __noreturn mpc7448_hpc2_restart(char *cmd)
 150{
 151        local_irq_disable();
 152
 153        /* Set exception prefix high - to the firmware */
 154        _nmask_and_or_msr(0, MSR_IP);
 155
 156        for (;;) ;              /* Spin until reset happens */
 157}
 158
 159/*
 160 * Called very early, device-tree isn't unflattened
 161 */
 162static int __init mpc7448_hpc2_probe(void)
 163{
 164        if (!of_machine_is_compatible("mpc74xx"))
 165                return 0;
 166        return 1;
 167}
 168
 169static int mpc7448_machine_check_exception(struct pt_regs *regs)
 170{
 171        const struct exception_table_entry *entry;
 172
 173        /* Are we prepared to handle this fault */
 174        if ((entry = search_exception_tables(regs->nip)) != NULL) {
 175                tsi108_clear_pci_cfg_error();
 176                regs->msr |= MSR_RI;
 177                regs->nip = extable_fixup(entry);
 178                return 1;
 179        }
 180        return 0;
 181}
 182
 183define_machine(mpc7448_hpc2){
 184        .name                   = "MPC7448 HPC2",
 185        .probe                  = mpc7448_hpc2_probe,
 186        .setup_arch             = mpc7448_hpc2_setup_arch,
 187        .init_IRQ               = mpc7448_hpc2_init_IRQ,
 188        .show_cpuinfo           = mpc7448_hpc2_show_cpuinfo,
 189        .get_irq                = mpic_get_irq,
 190        .restart                = mpc7448_hpc2_restart,
 191        .calibrate_decr         = generic_calibrate_decr,
 192        .machine_check_exception= mpc7448_machine_check_exception,
 193        .progress               = udbg_progress,
 194};
 195