// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *      WAX Device Driver
 *
 *      (c) Copyright 2000 The Puffin Group Inc.
 *
 *      (c) 2000-2023 by Helge Deller <deller@gmx.de>
 */

#include <linux/errno.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/types.h>

#include <asm/io.h>
#include <asm/hardware.h>

#include "gsc.h"

#define WAX_GSC_IRQ     7       /* Hardcoded Interrupt for GSC */

static void wax_choose_irq(struct parisc_device *dev, void *ctrl)
{
        int irq;

        switch (dev->id.sversion) {
                case 0x73:      irq =  1; break; /* i8042 General */
                case 0x8c:      irq =  6; break; /* Serial */
                case 0x90:      irq = 10; break; /* EISA */
                default:        return;          /* Unknown */
        }

        gsc_asic_assign_irq(ctrl, irq, &dev->irq);

        switch (dev->id.sversion) {
                case 0x73:      irq =  2; break; /* i8042 High-priority */
                case 0x90:      irq =  0; break; /* EISA NMI */
                default:        return;          /* No secondary IRQ */
        }

        gsc_asic_assign_irq(ctrl, irq, &dev->aux_irq);
}

static void __init
wax_init_irq(struct gsc_asic *wax)
{
        unsigned long base = wax->hpa;

        /* Wax-off */
        gsc_writel(0x00000000, base+OFFSET_IMR);

        /* clear pending interrupts */
        gsc_readl(base+OFFSET_IRR);

        /* We're not really convinced we want to reset the onboard
         * devices. Firmware does it for us...
         */

        /* Resets */
//      gsc_writel(0xFFFFFFFF, base+0x1000); /* HIL */
//      gsc_writel(0xFFFFFFFF, base+0x2000); /* RS232-B on Wax */
}

static int __init wax_init_chip(struct parisc_device *dev)
{
        struct gsc_asic *wax;
        struct parisc_device *parent;
        int ret;

        wax = kzalloc_obj(*wax);
        if (!wax)
                return -ENOMEM;

        wax->name = "wax";
        wax->hpa = dev->hpa.start;

        wax->version = 0;   /* gsc_readb(wax->hpa+WAX_VER); */
        printk(KERN_INFO "%s at 0x%lx found.\n", wax->name, wax->hpa);

        /* Stop wax hissing for a bit */
        wax_init_irq(wax);

        /* the IRQ wax should use */
        dev->irq = gsc_claim_irq(&wax->gsc_irq, WAX_GSC_IRQ);
        if (dev->irq < 0) {
                printk(KERN_ERR "%s(): cannot get GSC irq\n",
                                __func__);
                kfree(wax);
                return -EBUSY;
        }

        wax->eim = ((u32) wax->gsc_irq.txn_addr) | wax->gsc_irq.txn_data;

        ret = request_irq(wax->gsc_irq.irq, gsc_asic_intr, 0, "wax", wax);
        if (ret < 0) {
                kfree(wax);
                return ret;
        }

        /* enable IRQ's for devices below WAX */
        gsc_writel(wax->eim, wax->hpa + OFFSET_IAR);

        /* Done init'ing, register this driver */
        ret = gsc_common_setup(dev, wax);
        if (ret) {
                kfree(wax);
                return ret;
        }

        gsc_fixup_irqs(dev, wax, wax_choose_irq);
        /* On 715-class machines, Wax EISA is a sibling of Wax, not a child. */
        parent = parisc_parent(dev);
        if (parent->id.hw_type != HPHW_IOA) {
                gsc_fixup_irqs(parent, wax, wax_choose_irq);
        }

        return ret;
}

static const struct parisc_device_id wax_tbl[] __initconst = {
        { HPHW_BA, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x0008e },
        { 0, }
};

MODULE_DEVICE_TABLE(parisc, wax_tbl);

static struct parisc_driver wax_driver __refdata = {
        .name =         "wax",
        .id_table =     wax_tbl,
        .probe =        wax_init_chip,
};

static int __init wax_init(void)
{
        return register_parisc_driver(&wax_driver);
}
arch_initcall(wax_init);