// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Board setup routines for the Emerson/Artesyn MVME7100
 *
 * Copyright 2016 Elettra-Sincrotrone Trieste S.C.p.A.
 *
 * Author: Alessio Igor Bogani <alessio.bogani@elettra.eu>
 *
 * Based on earlier code by:
 *
 *      Ajit Prem <ajit.prem@emerson.com>
 *      Copyright 2008 Emerson
 *
 * USB host fixup is borrowed by:
 *
 *      Martyn Welch <martyn.welch@ge.com>
 *      Copyright 2008 GE Intelligent Platforms Embedded Systems, Inc.
 */

#include <linux/pci.h>
#include <linux/of.h>
#include <linux/of_fdt.h>
#include <linux/of_address.h>
#include <asm/udbg.h>
#include <asm/mpic.h>
#include <sysdev/fsl_soc.h>
#include <sysdev/fsl_pci.h>

#include "mpc86xx.h"

#define MVME7100_INTERRUPT_REG_2_OFFSET 0x05
#define MVME7100_DS1375_MASK            0x40
#define MVME7100_MAX6649_MASK           0x20
#define MVME7100_ABORT_MASK             0x10

/*
 * Setup the architecture
 */
static void __init mvme7100_setup_arch(void)
{
        struct device_node *bcsr_node;
        void __iomem *mvme7100_regs = NULL;
        u8 reg;

        if (ppc_md.progress)
                ppc_md.progress("mvme7100_setup_arch()", 0);

#ifdef CONFIG_SMP
        mpc86xx_smp_init();
#endif

        fsl_pci_assign_primary();

        /* Remap BCSR registers */
        bcsr_node = of_find_compatible_node(NULL, NULL,
                        "artesyn,mvme7100-bcsr");
        if (bcsr_node) {
                mvme7100_regs = of_iomap(bcsr_node, 0);
                of_node_put(bcsr_node);
        }

        if (mvme7100_regs) {
                /* Disable ds1375, max6649, and abort interrupts */
                reg = readb(mvme7100_regs + MVME7100_INTERRUPT_REG_2_OFFSET);
                reg |= MVME7100_DS1375_MASK | MVME7100_MAX6649_MASK
                        | MVME7100_ABORT_MASK;
                writeb(reg, mvme7100_regs + MVME7100_INTERRUPT_REG_2_OFFSET);
        } else
                pr_warn("Unable to map board registers\n");

        pr_info("MVME7100 board from Artesyn\n");
}

/*
 * Called very early, device-tree isn't unflattened
 */
static int __init mvme7100_probe(void)
{
        unsigned long root = of_get_flat_dt_root();

        return of_flat_dt_is_compatible(root, "artesyn,MVME7100");
}

static void mvme7100_usb_host_fixup(struct pci_dev *pdev)
{
        unsigned int val;

        if (!machine_is(mvme7100))
                return;

        /* Ensure only ports 1 & 2 are enabled */
        pci_read_config_dword(pdev, 0xe0, &val);
        pci_write_config_dword(pdev, 0xe0, (val & ~7) | 0x2);

        /* System clock is 48-MHz Oscillator and EHCI Enabled. */
        pci_write_config_dword(pdev, 0xe4, 1 << 5);
}
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_NEC, PCI_DEVICE_ID_NEC_USB,
        mvme7100_usb_host_fixup);

machine_arch_initcall(mvme7100, mpc86xx_common_publish_devices);

define_machine(mvme7100) {
        .name                   = "MVME7100",
        .probe                  = mvme7100_probe,
        .setup_arch             = mvme7100_setup_arch,
        .init_IRQ               = mpc86xx_init_irq,
        .get_irq                = mpic_get_irq,
        .time_init              = mpc86xx_time_init,
        .progress               = udbg_progress,
#ifdef CONFIG_PCI
        .pcibios_fixup_bus      = fsl_pcibios_fixup_bus,
#endif
};