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110 lines
2.7 KiB
C
110 lines
2.7 KiB
C
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/*
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** hppb.c:
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** HP-PB bus driver for the NOVA and K-Class systems.
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**
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** (c) Copyright 2002 Ryan Bradetich
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** (c) Copyright 2002 Hewlett-Packard Company
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**
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** This program is free software; you can redistribute it and/or modify
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** it under the terms of the GNU General Public License as published by
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** the Free Software Foundation; either version 2 of the License, or
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** (at your option) any later version.
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**
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** This Driver currently only supports the console (port 0) on the MUX.
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** Additional work will be needed on this driver to enable the full
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** functionality of the MUX.
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**
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*/
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#include <linux/types.h>
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#include <linux/init.h>
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#include <linux/mm.h>
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#include <linux/slab.h>
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#include <linux/ioport.h>
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#include <asm/io.h>
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#include <asm/hardware.h>
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#include <asm/parisc-device.h>
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#include <linux/pci.h>
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struct hppb_card {
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unsigned long hpa;
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struct resource mmio_region;
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struct hppb_card *next;
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};
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struct hppb_card hppb_card_head = {
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.hpa = 0,
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.next = NULL,
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};
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#define IO_IO_LOW offsetof(struct bc_module, io_io_low)
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#define IO_IO_HIGH offsetof(struct bc_module, io_io_high)
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/**
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* hppb_probe - Determine if the hppb driver should claim this device.
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* @dev: The device which has been found
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*
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* Determine if hppb driver should claim this chip (return 0) or not
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* (return 1). If so, initialize the chip and tell other partners in crime
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* they have work to do.
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*/
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static int hppb_probe(struct parisc_device *dev)
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{
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int status;
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struct hppb_card *card = &hppb_card_head;
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while(card->next) {
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card = card->next;
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}
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if(card->hpa) {
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card->next = kmalloc(sizeof(struct hppb_card), GFP_KERNEL);
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if(!card->next) {
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printk(KERN_ERR "HP-PB: Unable to allocate memory.\n");
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return 1;
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}
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memset(card->next, '\0', sizeof(struct hppb_card));
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card = card->next;
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}
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printk(KERN_INFO "Found GeckoBoa at 0x%lx\n", dev->hpa);
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card->hpa = dev->hpa;
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card->mmio_region.name = "HP-PB Bus";
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card->mmio_region.flags = IORESOURCE_MEM;
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card->mmio_region.start = __raw_readl(dev->hpa + IO_IO_LOW);
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card->mmio_region.end = __raw_readl(dev->hpa + IO_IO_HIGH) - 1;
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status = ccio_request_resource(dev, &card->mmio_region);
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if(status < 0) {
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printk(KERN_ERR "%s: failed to claim HP-PB bus space (%08lx, %08lx)\n",
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__FILE__, card->mmio_region.start, card->mmio_region.end);
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}
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return 0;
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}
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static struct parisc_device_id hppb_tbl[] = {
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{ HPHW_BCPORT, HVERSION_REV_ANY_ID, 0x500, 0xc },
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{ 0, }
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};
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static struct parisc_driver hppb_driver = {
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.name = "Gecko Boa",
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.id_table = hppb_tbl,
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.probe = hppb_probe,
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};
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/**
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* hppb_init - HP-PB bus initalization procedure.
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*
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* Register this driver.
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*/
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void __init hppb_init(void)
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{
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register_parisc_driver(&hppb_driver);
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}
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