[mirror_ubuntu-jammy-kernel.git] / drivers / ide / rz1000.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 *  Copyright (C) 1995-1998  Linus Torvalds & author (see below)
 */

/*
 *  Principal Author:  mlord@pobox.com (Mark Lord)
 *
 *  See linux/MAINTAINERS for address of current maintainer.
 *
 *  This file provides support for disabling the buggy read-ahead
 *  mode of the RZ1000 IDE chipset, commonly used on Intel motherboards.
 *
 *  Dunno if this fixes both ports, or only the primary port (?).
 */

#include <linux/types.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/ide.h>
#include <linux/init.h>

#define DRV_NAME "rz1000"

static int rz1000_disable_readahead(struct pci_dev *dev)
{
	u16 reg;

	if (!pci_read_config_word (dev, 0x40, &reg) &&
	    !pci_write_config_word(dev, 0x40, reg & 0xdfff)) {
		printk(KERN_INFO "%s: disabled chipset read-ahead "
			"(buggy RZ1000/RZ1001)\n", pci_name(dev));
		return 0;
	} else {
		printk(KERN_INFO "%s: serialized, disabled unmasking "
			"(buggy RZ1000/RZ1001)\n", pci_name(dev));
		return 1;
	}
}

static const struct ide_port_info rz1000_chipset = {
	.name		= DRV_NAME,
	.host_flags	= IDE_HFLAG_NO_DMA,
};

static int rz1000_init_one(struct pci_dev *dev, const struct pci_device_id *id)
{
	struct ide_port_info d = rz1000_chipset;
	int rc;

	rc = pci_enable_device(dev);
	if (rc)
		return rc;

	if (rz1000_disable_readahead(dev)) {
		d.host_flags |= IDE_HFLAG_SERIALIZE;
		d.host_flags |= IDE_HFLAG_NO_UNMASK_IRQS;
	}

	return ide_pci_init_one(dev, &d, NULL);
}

static void rz1000_remove(struct pci_dev *dev)
{
	ide_pci_remove(dev);
	pci_disable_device(dev);
}

static const struct pci_device_id rz1000_pci_tbl[] = {
	{ PCI_VDEVICE(PCTECH, PCI_DEVICE_ID_PCTECH_RZ1000), 0 },
	{ PCI_VDEVICE(PCTECH, PCI_DEVICE_ID_PCTECH_RZ1001), 0 },
	{ 0, },
};
MODULE_DEVICE_TABLE(pci, rz1000_pci_tbl);

static struct pci_driver rz1000_pci_driver = {
	.name		= "RZ1000_IDE",
	.id_table	= rz1000_pci_tbl,
	.probe		= rz1000_init_one,
	.remove		= rz1000_remove,
};

static int __init rz1000_ide_init(void)
{
	return ide_pci_register_driver(&rz1000_pci_driver);
}

static void __exit rz1000_ide_exit(void)
{
	pci_unregister_driver(&rz1000_pci_driver);
}

module_init(rz1000_ide_init);
module_exit(rz1000_ide_exit);

MODULE_AUTHOR("Andre Hedrick");
MODULE_DESCRIPTION("PCI driver module for RZ1000 IDE");
MODULE_LICENSE("GPL");
Commit	Line	Data
09c434b8	1	// SPDX-License-Identifier: GPL-2.0-only
1da177e4	2	/*
1da177e4 LT	3	* Copyright (C) 1995-1998 Linus Torvalds & author (see below)
	4	*/
	5
	6	/*
	7	* Principal Author: mlord@pobox.com (Mark Lord)
	8	*
	9	* See linux/MAINTAINERS for address of current maintainer.
	10	*
	11	* This file provides support for disabling the buggy read-ahead
	12	* mode of the RZ1000 IDE chipset, commonly used on Intel motherboards.
	13	*
	14	* Dunno if this fixes both ports, or only the primary port (?).
	15	*/
	16
1da177e4 LT	17	#include <linux/types.h>
	18	#include <linux/module.h>
	19	#include <linux/kernel.h>
1da177e4 LT	20	#include <linux/pci.h>
	21	#include <linux/ide.h>
	22	#include <linux/init.h>
	23
ced3ec8a BZ	24	#define DRV_NAME "rz1000"
ced3ec8a BZ	25
fe31edc8	26	static int rz1000_disable_readahead(struct pci_dev *dev)
1da177e4 LT	27	{
1da177e4 LT	28	u16 reg;
1da177e4	29
1da177e4 LT	30	if (!pci_read_config_word (dev, 0x40, &reg) &&
	31	!pci_write_config_word(dev, 0x40, reg & 0xdfff)) {
	32	printk(KERN_INFO "%s: disabled chipset read-ahead "
7f1ac8c4 BZ	33	"(buggy RZ1000/RZ1001)\n", pci_name(dev));
7f1ac8c4 BZ	34	return 0;
1da177e4	35	} else {
1da177e4	36	printk(KERN_INFO "%s: serialized, disabled unmasking "
7f1ac8c4 BZ	37	"(buggy RZ1000/RZ1001)\n", pci_name(dev));
7f1ac8c4 BZ	38	return 1;
1da177e4 LT	39	}
	40	}
	41
fe31edc8	42	static const struct ide_port_info rz1000_chipset = {
ced3ec8a	43	.name = DRV_NAME,
5e71d9c5	44	.host_flags = IDE_HFLAG_NO_DMA,
1da177e4 LT	45	};
1da177e4 LT	46
fe31edc8	47	static int rz1000_init_one(struct pci_dev dev, const struct pci_device_id id)
1da177e4	48	{
7f1ac8c4 BZ	49	struct ide_port_info d = rz1000_chipset;
	50	int rc;
	51
	52	rc = pci_enable_device(dev);
	53	if (rc)
	54	return rc;
	55
	56	if (rz1000_disable_readahead(dev)) {
	57	d.host_flags \|= IDE_HFLAG_SERIALIZE;
	58	d.host_flags \|= IDE_HFLAG_NO_UNMASK_IRQS;
	59	}
	60
	61	return ide_pci_init_one(dev, &d, NULL);
	62	}
	63
	64	static void rz1000_remove(struct pci_dev *dev)
	65	{
	66	ide_pci_remove(dev);
	67	pci_disable_device(dev);
1da177e4 LT	68	}
1da177e4 LT	69
9cbcc5e3 BZ	70	static const struct pci_device_id rz1000_pci_tbl[] = {
	71	{ PCI_VDEVICE(PCTECH, PCI_DEVICE_ID_PCTECH_RZ1000), 0 },
	72	{ PCI_VDEVICE(PCTECH, PCI_DEVICE_ID_PCTECH_RZ1001), 0 },
1da177e4 LT	73	{ 0, },
	74	};
	75	MODULE_DEVICE_TABLE(pci, rz1000_pci_tbl);
	76
a9ab09e2	77	static struct pci_driver rz1000_pci_driver = {
1da177e4 LT	78	.name = "RZ1000_IDE",
	79	.id_table = rz1000_pci_tbl,
	80	.probe = rz1000_init_one,
7f1ac8c4	81	.remove = rz1000_remove,
1da177e4 LT	82	};
1da177e4 LT	83
82ab1eec	84	static int __init rz1000_ide_init(void)
1da177e4	85	{
a9ab09e2	86	return ide_pci_register_driver(&rz1000_pci_driver);
1da177e4 LT	87	}
1da177e4 LT	88
0fd18804 BZ	89	static void __exit rz1000_ide_exit(void)
0fd18804 BZ	90	{
a9ab09e2	91	pci_unregister_driver(&rz1000_pci_driver);
0fd18804 BZ	92	}
0fd18804 BZ	93
1da177e4	94	module_init(rz1000_ide_init);
0fd18804	95	module_exit(rz1000_ide_exit);
1da177e4 LT	96
	97	MODULE_AUTHOR("Andre Hedrick");
	98	MODULE_DESCRIPTION("PCI driver module for RZ1000 IDE");
	99	MODULE_LICENSE("GPL");
	100