LXR linux/arch/powerpc/platforms/embedded6xx/mpc7448

   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 <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        phys_addr_t mpic_paddr = 0;
 105        struct device_node *tsi_pic;
 106#ifdef CONFIG_PCI
 107        unsigned int cascade_pci_irq;
 108        struct device_node *tsi_pci;
 109        struct device_node *cascade_node = NULL;
 110#endif
 111
 112        tsi_pic = of_find_node_by_type(NULL, "open-pic");
 113        if (tsi_pic) {
 114                unsigned int size;
 115                const void *prop = of_get_property(tsi_pic, "reg", &size);
 116                mpic_paddr = of_translate_address(tsi_pic, prop);
 117        }
 118
 119        if (mpic_paddr == 0) {
 120                printk("%s: No tsi108 PIC found !\n", __func__);
 121                return;
 122        }
 123
 124        DBG("%s: tsi108 pic phys_addr = 0x%x\n", __func__,
 125            (u32) mpic_paddr);
 126
 127        mpic = mpic_alloc(tsi_pic, mpic_paddr,
 128                        MPIC_PRIMARY | MPIC_BIG_ENDIAN | MPIC_WANTS_RESET |
 129                        MPIC_SPV_EOI | MPIC_NO_PTHROU_DIS | MPIC_REGSET_TSI108,
 130                        24,
 131                        NR_IRQS-4, /* num_sources used */
 132                        "Tsi108_PIC");
 133
 134        BUG_ON(mpic == NULL);
 135
 136        mpic_assign_isu(mpic, 0, mpic_paddr + 0x100);
 137
 138        mpic_init(mpic);
 139
 140#ifdef CONFIG_PCI
 141        tsi_pci = of_find_node_by_type(NULL, "pci");
 142        if (tsi_pci == NULL) {
 143                printk("%s: No tsi108 pci node found !\n", __func__);
 144                return;
 145        }
 146        cascade_node = of_find_node_by_type(NULL, "pic-router");
 147        if (cascade_node == NULL) {
 148                printk("%s: No tsi108 pci cascade node found !\n", __func__);
 149                return;
 150        }
 151
 152        cascade_pci_irq = irq_of_parse_and_map(tsi_pci, 0);
 153        DBG("%s: tsi108 cascade_pci_irq = 0x%x\n", __func__,
 154            (u32) cascade_pci_irq);
 155        tsi108_pci_int_init(cascade_node);
 156        set_irq_data(cascade_pci_irq, mpic);
 157        set_irq_chained_handler(cascade_pci_irq, tsi108_irq_cascade);
 158#endif
 159        /* Configure MPIC outputs to CPU0 */
 160        tsi108_write_reg(TSI108_MPIC_OFFSET + 0x30c, 0);
 161        of_node_put(tsi_pic);
 162}
 163
 164void mpc7448_hpc2_show_cpuinfo(struct seq_file *m)
 165{
 166        seq_printf(m, "vendor\t\t: Freescale Semiconductor\n");
 167}
 168
 169void mpc7448_hpc2_restart(char *cmd)
 170{
 171        local_irq_disable();
 172
 173        /* Set exception prefix high - to the firmware */
 174        _nmask_and_or_msr(0, MSR_IP);
 175
 176        for (;;) ;              /* Spin until reset happens */
 177}
 178
 179void mpc7448_hpc2_power_off(void)
 180{
 181        local_irq_disable();
 182        for (;;) ;              /* No way to shut power off with software */
 183}
 184
 185void mpc7448_hpc2_halt(void)
 186{
 187        mpc7448_hpc2_power_off();
 188}
 189
 190/*
 191 * Called very early, device-tree isn't unflattened
 192 */
 193static int __init mpc7448_hpc2_probe(void)
 194{
 195        unsigned long root = of_get_flat_dt_root();
 196
 197        if (!of_flat_dt_is_compatible(root, "mpc74xx"))
 198                return 0;
 199        return 1;
 200}
 201
 202static int mpc7448_machine_check_exception(struct pt_regs *regs)
 203{
 204        const struct exception_table_entry *entry;
 205
 206        /* Are we prepared to handle this fault */
 207        if ((entry = search_exception_tables(regs->nip)) != NULL) {
 208                tsi108_clear_pci_cfg_error();
 209                regs->msr |= MSR_RI;
 210                regs->nip = entry->fixup;
 211                return 1;
 212        }
 213        return 0;
 214}
 215
 216define_machine(mpc7448_hpc2){
 217        .name                   = "MPC7448 HPC2",
 218        .probe                  = mpc7448_hpc2_probe,
 219        .setup_arch             = mpc7448_hpc2_setup_arch,
 220        .init_IRQ               = mpc7448_hpc2_init_IRQ,
 221        .show_cpuinfo           = mpc7448_hpc2_show_cpuinfo,
 222        .get_irq                = mpic_get_irq,
 223        .restart                = mpc7448_hpc2_restart,
 224        .calibrate_decr         = generic_calibrate_decr,
 225        .machine_check_exception= mpc7448_machine_check_exception,
 226        .progress               = udbg_progress,
 227};
 228