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// 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(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 (%pR)\n",
__FILE__, &card->mmio_region);
}
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.
*/
void __init hppb_init(void)
{
register_parisc_driver(&hppb_driver);
}
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