1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
|
/*
* RZ1000/1001 driver based upon
*
* linux/drivers/ide/pci/rz1000.c Version 0.06 January 12, 2003
* 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.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <linux/blkdev.h>
#include <linux/delay.h>
#include <scsi/scsi_host.h>
#include <linux/libata.h>
#define DRV_NAME "pata_rz1000"
#define DRV_VERSION "0.2.4"
/**
* rz1000_set_mode - mode setting function
* @link: ATA link
* @unused: returned device on set_mode failure
*
* Use a non standard set_mode function. We don't want to be tuned. We
* would prefer to be BIOS generic but for the fact our hardware is
* whacked out.
*/
static int rz1000_set_mode(struct ata_link *link, struct ata_device **unused)
{
struct ata_device *dev;
ata_link_for_each_dev(dev, link) {
if (ata_dev_enabled(dev)) {
/* We don't really care */
dev->pio_mode = XFER_PIO_0;
dev->xfer_mode = XFER_PIO_0;
dev->xfer_shift = ATA_SHIFT_PIO;
dev->flags |= ATA_DFLAG_PIO;
ata_dev_printk(dev, KERN_INFO, "configured for PIO\n");
}
}
return 0;
}
static struct scsi_host_template rz1000_sht = {
ATA_PIO_SHT(DRV_NAME),
};
static struct ata_port_operations rz1000_port_ops = {
.inherits = &ata_sff_port_ops,
.cable_detect = ata_cable_40wire,
.set_mode = rz1000_set_mode,
};
static int rz1000_fifo_disable(struct pci_dev *pdev)
{
u16 reg;
/* Be exceptionally paranoid as we must be sure to apply the fix */
if (pci_read_config_word(pdev, 0x40, ®) != 0)
return -1;
reg &= 0xDFFF;
if (pci_write_config_word(pdev, 0x40, reg) != 0)
return -1;
printk(KERN_INFO DRV_NAME ": disabled chipset readahead.\n");
return 0;
}
/**
* rz1000_init_one - Register RZ1000 ATA PCI device with kernel services
* @pdev: PCI device to register
* @ent: Entry in rz1000_pci_tbl matching with @pdev
*
* Configure an RZ1000 interface. This doesn't require much special
* handling except that we *MUST* kill the chipset readahead or the
* user may experience data corruption.
*/
static int rz1000_init_one (struct pci_dev *pdev, const struct pci_device_id *ent)
{
static int printed_version;
static const struct ata_port_info info = {
.flags = ATA_FLAG_SLAVE_POSS,
.pio_mask = 0x1f,
.port_ops = &rz1000_port_ops
};
const struct ata_port_info *ppi[] = { &info, NULL };
if (!printed_version++)
printk(KERN_DEBUG DRV_NAME " version " DRV_VERSION "\n");
if (rz1000_fifo_disable(pdev) == 0)
return ata_pci_init_one(pdev, ppi, &rz1000_sht, NULL);
printk(KERN_ERR DRV_NAME ": failed to disable read-ahead on chipset..\n");
/* Not safe to use so skip */
return -ENODEV;
}
#ifdef CONFIG_PM
static int rz1000_reinit_one(struct pci_dev *pdev)
{
/* If this fails on resume (which is a "cant happen" case), we
must stop as any progress risks data loss */
if (rz1000_fifo_disable(pdev))
panic("rz1000 fifo");
return ata_pci_device_resume(pdev);
}
#endif
static const struct pci_device_id pata_rz1000[] = {
{ PCI_VDEVICE(PCTECH, PCI_DEVICE_ID_PCTECH_RZ1000), },
{ PCI_VDEVICE(PCTECH, PCI_DEVICE_ID_PCTECH_RZ1001), },
{ },
};
static struct pci_driver rz1000_pci_driver = {
.name = DRV_NAME,
.id_table = pata_rz1000,
.probe = rz1000_init_one,
.remove = ata_pci_remove_one,
#ifdef CONFIG_PM
.suspend = ata_pci_device_suspend,
.resume = rz1000_reinit_one,
#endif
};
static int __init rz1000_init(void)
{
return pci_register_driver(&rz1000_pci_driver);
}
static void __exit rz1000_exit(void)
{
pci_unregister_driver(&rz1000_pci_driver);
}
MODULE_AUTHOR("Alan Cox");
MODULE_DESCRIPTION("low-level driver for RZ1000 PCI ATA");
MODULE_LICENSE("GPL");
MODULE_DEVICE_TABLE(pci, pata_rz1000);
MODULE_VERSION(DRV_VERSION);
module_init(rz1000_init);
module_exit(rz1000_exit);
|
