// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * mpc7448_hpc2.c
 *
 * Board setup routines for the Freescale mpc7448hpc2(taiga) platform
 *
 * Author: Jacob Pan
 *       jacob.pan@freescale.com
 * Author: Xianghua Xiao
 *       x.xiao@freescale.com
 * Maintainer: Roy Zang <tie-fei.zang@freescale.com>
 *      Add Flat Device Tree support fot mpc7448hpc2 board
 *
 * Copyright 2004-2006 Freescale Semiconductor, Inc.
 */

#include <linux/stddef.h>
#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/kdev_t.h>
#include <linux/console.h>
#include <linux/extable.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");
}

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

        /* Set exception prefix high - to the firmware */
        mtmsr(mfmsr() | MSR_IP);
        isync();

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

/*
 * Called very early, device-tree isn't unflattened
 */
static int __init mpc7448_hpc2_probe(void)
{
        if (!of_machine_is_compatible("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 = extable_fixup(entry);
                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,
};