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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pata_isapnp.c (3318B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2
      3/*
      4 *   pata-isapnp.c - ISA PnP PATA controller driver.
      5 *   Copyright 2005/2006 Red Hat Inc, all rights reserved.
      6 *
      7 *   Based in part on ide-pnp.c by Andrey Panin <pazke@donpac.ru>
      8 */
      9
     10#include <linux/kernel.h>
     11#include <linux/module.h>
     12#include <linux/isapnp.h>
     13#include <linux/init.h>
     14#include <linux/blkdev.h>
     15#include <linux/delay.h>
     16#include <scsi/scsi_host.h>
     17#include <linux/ata.h>
     18#include <linux/libata.h>
     19
     20#define DRV_NAME "pata_isapnp"
     21#define DRV_VERSION "0.2.5"
     22
     23static struct scsi_host_template isapnp_sht = {
     24	ATA_PIO_SHT(DRV_NAME),
     25};
     26
     27static struct ata_port_operations isapnp_port_ops = {
     28	.inherits	= &ata_sff_port_ops,
     29	.cable_detect	= ata_cable_40wire,
     30};
     31
     32static struct ata_port_operations isapnp_noalt_port_ops = {
     33	.inherits	= &ata_sff_port_ops,
     34	.cable_detect	= ata_cable_40wire,
     35	/* No altstatus so we don't want to use the lost interrupt poll */
     36	.lost_interrupt = ATA_OP_NULL,
     37};
     38
     39/**
     40 *	isapnp_init_one		-	attach an isapnp interface
     41 *	@idev: PnP device
     42 *	@dev_id: matching detect line
     43 *
     44 *	Register an ISA bus IDE interface. Such interfaces are PIO 0 and
     45 *	non shared IRQ.
     46 */
     47
     48static int isapnp_init_one(struct pnp_dev *idev, const struct pnp_device_id *dev_id)
     49{
     50	struct ata_host *host;
     51	struct ata_port *ap;
     52	void __iomem *cmd_addr, *ctl_addr;
     53	int irq = 0;
     54	irq_handler_t handler = NULL;
     55
     56	if (pnp_port_valid(idev, 0) == 0)
     57		return -ENODEV;
     58
     59	if (pnp_irq_valid(idev, 0)) {
     60		irq = pnp_irq(idev, 0);
     61		handler = ata_sff_interrupt;
     62	}
     63
     64	/* allocate host */
     65	host = ata_host_alloc(&idev->dev, 1);
     66	if (!host)
     67		return -ENOMEM;
     68
     69	/* acquire resources and fill host */
     70	cmd_addr = devm_ioport_map(&idev->dev, pnp_port_start(idev, 0), 8);
     71	if (!cmd_addr)
     72		return -ENOMEM;
     73
     74	ap = host->ports[0];
     75
     76	ap->ops = &isapnp_noalt_port_ops;
     77	ap->pio_mask = ATA_PIO0;
     78	ap->flags |= ATA_FLAG_SLAVE_POSS;
     79
     80	ap->ioaddr.cmd_addr = cmd_addr;
     81
     82	if (pnp_port_valid(idev, 1)) {
     83		ctl_addr = devm_ioport_map(&idev->dev,
     84					   pnp_port_start(idev, 1), 1);
     85		ap->ioaddr.altstatus_addr = ctl_addr;
     86		ap->ioaddr.ctl_addr = ctl_addr;
     87		ap->ops = &isapnp_port_ops;
     88	}
     89
     90	ata_sff_std_ports(&ap->ioaddr);
     91
     92	ata_port_desc(ap, "cmd 0x%llx ctl 0x%llx",
     93		      (unsigned long long)pnp_port_start(idev, 0),
     94		      (unsigned long long)pnp_port_start(idev, 1));
     95
     96	/* activate */
     97	return ata_host_activate(host, irq, handler, 0,
     98				 &isapnp_sht);
     99}
    100
    101/**
    102 *	isapnp_remove_one	-	unplug an isapnp interface
    103 *	@idev: PnP device
    104 *
    105 *	Remove a previously configured PnP ATA port. Called only on module
    106 *	unload events as the core does not currently deal with ISAPnP docking.
    107 */
    108
    109static void isapnp_remove_one(struct pnp_dev *idev)
    110{
    111	struct device *dev = &idev->dev;
    112	struct ata_host *host = dev_get_drvdata(dev);
    113
    114	ata_host_detach(host);
    115}
    116
    117static struct pnp_device_id isapnp_devices[] = {
    118  	/* Generic ESDI/IDE/ATA compatible hard disk controller */
    119	{.id = "PNP0600", .driver_data = 0},
    120	{.id = ""}
    121};
    122
    123MODULE_DEVICE_TABLE(pnp, isapnp_devices);
    124
    125static struct pnp_driver isapnp_driver = {
    126	.name		= DRV_NAME,
    127	.id_table	= isapnp_devices,
    128	.probe		= isapnp_init_one,
    129	.remove		= isapnp_remove_one,
    130};
    131
    132module_pnp_driver(isapnp_driver);
    133MODULE_AUTHOR("Alan Cox");
    134MODULE_DESCRIPTION("low-level driver for ISA PnP ATA");
    135MODULE_LICENSE("GPL");
    136MODULE_VERSION(DRV_VERSION);