cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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hppb.c (2523B)

      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/*
      3** hppb.c:
      4**      HP-PB bus driver for the NOVA and K-Class systems.
      5**
      6**      (c) Copyright 2002 Ryan Bradetich
      7**      (c) Copyright 2002 Hewlett-Packard Company
      8**
      9**
     10*/
     11
     12#include <linux/types.h>
     13#include <linux/init.h>
     14#include <linux/mm.h>
     15#include <linux/slab.h>
     16#include <linux/dma-mapping.h>
     17#include <linux/ioport.h>
     18
     19#include <asm/io.h>
     20#include <asm/hardware.h>
     21#include <asm/parisc-device.h>
     22
     23#include "iommu.h"
     24
     25struct hppb_card {
     26	unsigned long hpa;
     27	struct resource mmio_region;
     28	struct hppb_card *next;
     29};
     30
     31static struct hppb_card hppb_card_head = {
     32	.hpa = 0,
     33	.next = NULL,
     34};
     35
     36#define IO_IO_LOW  offsetof(struct bc_module, io_io_low)
     37#define IO_IO_HIGH offsetof(struct bc_module, io_io_high)
     38
     39/**
     40 * hppb_probe - Determine if the hppb driver should claim this device.
     41 * @dev: The device which has been found
     42 *
     43 * Determine if hppb driver should claim this chip (return 0) or not 
     44 * (return 1). If so, initialize the chip and tell other partners in crime 
     45 * they have work to do.
     46 */
     47static int __init hppb_probe(struct parisc_device *dev)
     48{
     49	int status;
     50	struct hppb_card *card = &hppb_card_head;
     51
     52	while(card->next) {
     53		card = card->next;
     54	}
     55
     56	if(card->hpa) {
     57		card->next = kzalloc(sizeof(struct hppb_card), GFP_KERNEL);
     58		if(!card->next) {
     59			printk(KERN_ERR "HP-PB: Unable to allocate memory.\n");
     60			return 1;
     61		}
     62		card = card->next;
     63	}
     64
     65	card->hpa = dev->hpa.start;
     66	card->mmio_region.name = "HP-PB Bus";
     67	card->mmio_region.flags = IORESOURCE_MEM;
     68
     69	card->mmio_region.start = gsc_readl(dev->hpa.start + IO_IO_LOW);
     70	card->mmio_region.end = gsc_readl(dev->hpa.start + IO_IO_HIGH) - 1;
     71
     72	status = ccio_request_resource(dev, &card->mmio_region);
     73
     74	pr_info("Found GeckoBoa at %pap, bus space %pR,%s claimed.\n",
     75			&dev->hpa.start,
     76			&card->mmio_region,
     77			(status < 0) ? " not":"" );
     78
     79        return 0;
     80}
     81
     82static const struct parisc_device_id hppb_tbl[] __initconst = {
     83        { HPHW_BCPORT, HVERSION_REV_ANY_ID, 0x500, 0xc }, /* E25 and K */
     84        { HPHW_BCPORT, 0x0, 0x501, 0xc }, /* E35 */
     85        { HPHW_BCPORT, 0x0, 0x502, 0xc }, /* E45 */
     86        { HPHW_BCPORT, 0x0, 0x503, 0xc }, /* E55 */
     87        { 0, }
     88};
     89
     90static struct parisc_driver hppb_driver __refdata = {
     91        .name =         "gecko_boa",
     92        .id_table =     hppb_tbl,
     93	.probe =        hppb_probe,
     94};
     95
     96/**
     97 * hppb_init - HP-PB bus initialization procedure.
     98 *
     99 * Register this driver.   
    100 */
    101void __init hppb_init(void)
    102{
    103        register_parisc_driver(&hppb_driver);
    104}