hppb.c

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/*
** hppb.c:
**      HP-PB bus driver for the NOVA and K-Class systems.
**
**      (c) Copyright 2002 Ryan Bradetich
**      (c) Copyright 2002 Hewlett-Packard Company
**
** 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/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>

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)

static int 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(sizeof(struct hppb_card), GFP_KERNEL);
        if(!card->next) {
            printk(KERN_ERR "HP-PB: Unable to allocate memory.\n");
            return 1;
        }
        card = card->next;
    }
    printk(KERN_INFO "Found GeckoBoa at 0x%llx\n",
            (unsigned long long) dev->hpa.start);

    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);
    if(status < 0) {
        printk(KERN_ERR "%s: failed to claim HP-PB "
            "bus space (0x%08llx, 0x%08llx)\n",
            __FILE__, (unsigned long long) card->mmio_region.start,
            (unsigned long long) card->mmio_region.end);
    }

        return 0;
}

static struct parisc_device_id hppb_tbl[] = {
        { 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 = {
        .name =         "gecko_boa",
        .id_table =     hppb_tbl,
    .probe =        hppb_probe,
};

void __init hppb_init(void)
{
        register_parisc_driver(&hppb_driver);
}