mpc7448_hpc2.c

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/*
 * mpc7448_hpc2.c
 *
 * Board setup routines for the Freescale mpc7448hpc2(taiga) platform
 *
 * Author: Jacob Pan
 *   [email protected]
 * Author: Xianghua Xiao
 *       [email protected]
 * Maintainer: Roy Zang <[email protected]>
 *  Add Flat Device Tree support fot mpc7448hpc2 board
 *
 * Copyright 2004-2006 Freescale Semiconductor, Inc.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version
 * 2 of the License, or (at your option) any later version.
 */

#include <linux/stddef.h>
#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/kdev_t.h>
#include <linux/console.h>
#include <linux/module.h>
#include <linux/delay.h>
#include <linux/irq.h>
#include <linux/seq_file.h>
#include <linux/root_dev.h>
#include <linux/serial.h>
#include <linux/tty.h>
#include <linux/serial_core.h>

#include <asm/time.h>
#include <asm/machdep.h>
#include <asm/prom.h>
#include <asm/udbg.h>
#include <asm/tsi108.h>
#include <asm/pci-bridge.h>
#include <asm/reg.h>
#include <mm/mmu_decl.h>
#include <asm/tsi108_pci.h>
#include <asm/tsi108_irq.h>
#include <asm/mpic.h>

#undef DEBUG
#ifdef DEBUG
#define DBG(fmt...) do { printk(fmt); } while(0)
#else
#define DBG(fmt...) do { } while(0)
#endif

#define MPC7448HPC2_PCI_CFG_PHYS 0xfb000000

int mpc7448_hpc2_exclude_device(struct pci_controller *hose,
                u_char bus, u_char devfn)
{
    if (bus == 0 && PCI_SLOT(devfn) == 0)
        return PCIBIOS_DEVICE_NOT_FOUND;
    else
        return PCIBIOS_SUCCESSFUL;
}

static void __init mpc7448_hpc2_setup_arch(void)
{
    struct device_node *np;
    if (ppc_md.progress)
        ppc_md.progress("mpc7448_hpc2_setup_arch():set_bridge", 0);

    tsi108_csr_vir_base = get_vir_csrbase();

    /* setup PCI host bridge */
#ifdef CONFIG_PCI
    for_each_compatible_node(np, "pci", "tsi108-pci")
        tsi108_setup_pci(np, MPC7448HPC2_PCI_CFG_PHYS, 0);

    ppc_md.pci_exclude_device = mpc7448_hpc2_exclude_device;
    if (ppc_md.progress)
        ppc_md.progress("tsi108: resources set", 0x100);
#endif

    printk(KERN_INFO "MPC7448HPC2 (TAIGA) Platform\n");
    printk(KERN_INFO
           "Jointly ported by Freescale and Tundra Semiconductor\n");
    printk(KERN_INFO
           "Enabling L2 cache then enabling the HID0 prefetch engine.\n");
}

/*
 * Interrupt setup and service.  Interrupts on the mpc7448_hpc2 come
 * from the four external INT pins, PCI interrupts are routed via
 * PCI interrupt control registers, it generates internal IRQ23
 *
 * Interrupt routing on the Taiga Board:
 * TSI108:PB_INT[0] -> CPU0:INT#
 * TSI108:PB_INT[1] -> CPU0:MCP#
 * TSI108:PB_INT[2] -> N/C
 * TSI108:PB_INT[3] -> N/C
 */
static void __init mpc7448_hpc2_init_IRQ(void)
{
    struct mpic *mpic;
#ifdef CONFIG_PCI
    unsigned int cascade_pci_irq;
    struct device_node *tsi_pci;
    struct device_node *cascade_node = NULL;
#endif

    mpic = mpic_alloc(NULL, 0, MPIC_BIG_ENDIAN |
            MPIC_SPV_EOI | MPIC_NO_PTHROU_DIS | MPIC_REGSET_TSI108,
            24, 0,
            "Tsi108_PIC");

    BUG_ON(mpic == NULL);

    mpic_assign_isu(mpic, 0, mpic->paddr + 0x100);

    mpic_init(mpic);

#ifdef CONFIG_PCI
    tsi_pci = of_find_node_by_type(NULL, "pci");
    if (tsi_pci == NULL) {
        printk("%s: No tsi108 pci node found !\n", __func__);
        return;
    }
    cascade_node = of_find_node_by_type(NULL, "pic-router");
    if (cascade_node == NULL) {
        printk("%s: No tsi108 pci cascade node found !\n", __func__);
        return;
    }

    cascade_pci_irq = irq_of_parse_and_map(tsi_pci, 0);
    DBG("%s: tsi108 cascade_pci_irq = 0x%x\n", __func__,
        (u32) cascade_pci_irq);
    tsi108_pci_int_init(cascade_node);
    irq_set_handler_data(cascade_pci_irq, mpic);
    irq_set_chained_handler(cascade_pci_irq, tsi108_irq_cascade);
#endif
    /* Configure MPIC outputs to CPU0 */
    tsi108_write_reg(TSI108_MPIC_OFFSET + 0x30c, 0);
}

void mpc7448_hpc2_show_cpuinfo(struct seq_file *m)
{
    seq_printf(m, "vendor\t\t: Freescale Semiconductor\n");
}

void mpc7448_hpc2_restart(char *cmd)
{
    local_irq_disable();

    /* Set exception prefix high - to the firmware */
    _nmask_and_or_msr(0, MSR_IP);

    for (;;) ;      /* Spin until reset happens */
}

void mpc7448_hpc2_power_off(void)
{
    local_irq_disable();
    for (;;) ;      /* No way to shut power off with software */
}

void mpc7448_hpc2_halt(void)
{
    mpc7448_hpc2_power_off();
}

/*
 * Called very early, device-tree isn't unflattened
 */
static int __init mpc7448_hpc2_probe(void)
{
    unsigned long root = of_get_flat_dt_root();

    if (!of_flat_dt_is_compatible(root, "mpc74xx"))
        return 0;
    return 1;
}

static int mpc7448_machine_check_exception(struct pt_regs *regs)
{
    const struct exception_table_entry *entry;

    /* Are we prepared to handle this fault */
    if ((entry = search_exception_tables(regs->nip)) != NULL) {
        tsi108_clear_pci_cfg_error();
        regs->msr |= MSR_RI;
        regs->nip = entry->fixup;
        return 1;
    }
    return 0;
}

define_machine(mpc7448_hpc2){
    .name           = "MPC7448 HPC2",
    .probe          = mpc7448_hpc2_probe,
    .setup_arch         = mpc7448_hpc2_setup_arch,
    .init_IRQ       = mpc7448_hpc2_init_IRQ,
    .show_cpuinfo       = mpc7448_hpc2_show_cpuinfo,
    .get_irq        = mpic_get_irq,
    .restart        = mpc7448_hpc2_restart,
    .calibrate_decr     = generic_calibrate_decr,
    .machine_check_exception= mpc7448_machine_check_exception,
    .progress       = udbg_progress,
};