// SPDX-License-Identifier: GPL-2.0-or-later
/*
** hppb.c:
**      HP-PB bus driver for the NOVA and K-Class systems.
**
**      (c) Copyright 2002 Ryan Bradetich
**      (c) Copyright 2002 Hewlett-Packard Company
**
**
*/

#include <linux/types.h>
#include <linux/init.h>
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/dma-mapping.h>
#include <linux/ioport.h>

#include <asm/io.h>
#include <asm/hardware.h>
#include <asm/parisc-device.h>

#include "iommu.h"

struct hppb_card {
        unsigned long hpa;
        struct resource mmio_region;
        struct hppb_card *next;
};

static struct hppb_card hppb_card_head = {
        .hpa = 0,
        .next = NULL,
};

#define IO_IO_LOW  offsetof(struct bc_module, io_io_low)
#define IO_IO_HIGH offsetof(struct bc_module, io_io_high)

/**
 * hppb_probe - Determine if the hppb driver should claim this device.
 * @dev: The device which has been found
 *
 * Determine if hppb driver should claim this chip (return 0) or not 
 * (return 1). If so, initialize the chip and tell other partners in crime 
 * they have work to do.
 */
static int __init hppb_probe(struct parisc_device *dev)
{
        int status;
        struct hppb_card *card = &hppb_card_head;

        while(card->next) {
                card = card->next;
        }

        if(card->hpa) {
                card->next = kzalloc_obj(struct hppb_card);
                if(!card->next) {
                        printk(KERN_ERR "HP-PB: Unable to allocate memory.\n");
                        return 1;
                }
                card = card->next;
        }

        card->hpa = dev->hpa.start;
        card->mmio_region.name = "HP-PB Bus";
        card->mmio_region.flags = IORESOURCE_MEM;

        card->mmio_region.start = gsc_readl(dev->hpa.start + IO_IO_LOW);
        card->mmio_region.end = gsc_readl(dev->hpa.start + IO_IO_HIGH) - 1;

        status = ccio_request_resource(dev, &card->mmio_region);

        pr_info("Found GeckoBoa at %pap, bus space %pR,%s claimed.\n",
                        &dev->hpa.start,
                        &card->mmio_region,
                        (status < 0) ? " not":"" );

        return 0;
}

static const struct parisc_device_id hppb_tbl[] __initconst = {
        { HPHW_BCPORT, HVERSION_REV_ANY_ID, 0x500, 0xc }, /* E25 and K */
        { HPHW_BCPORT, 0x0, 0x501, 0xc }, /* E35 */
        { HPHW_BCPORT, 0x0, 0x502, 0xc }, /* E45 */
        { HPHW_BCPORT, 0x0, 0x503, 0xc }, /* E55 */
        { 0, }
};

static struct parisc_driver hppb_driver __refdata = {
        .name =         "gecko_boa",
        .id_table =     hppb_tbl,
        .probe =        hppb_probe,
};

/**
 * hppb_init - HP-PB bus initialization procedure.
 *
 * Register this driver.
 */
static int __init hppb_init(void)
{
        return register_parisc_driver(&hppb_driver);
}
arch_initcall(hppb_init);