1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * RZ1000/1001 driver based upon
4 *
5 * linux/drivers/ide/pci/rz1000.c Version 0.06 January 12, 2003
6 * Copyright (C) 1995-1998 Linus Torvalds & author (see below)
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
15 #include <linux/kernel.h>
16 #include <linux/module.h>
17 #include <linux/pci.h>
18 #include <linux/blkdev.h>
19 #include <linux/delay.h>
20 #include <scsi/scsi_host.h>
21 #include <linux/libata.h>
22
23 #define DRV_NAME "pata_rz1000"
24 #define DRV_VERSION "0.2.4"
25
26
27 /**
28 * rz1000_set_mode - mode setting function
29 * @link: ATA link
30 * @unused: returned device on set_mode failure
31 *
32 * Use a non standard set_mode function. We don't want to be tuned. We
33 * would prefer to be BIOS generic but for the fact our hardware is
34 * whacked out.
35 */
36
rz1000_set_mode(struct ata_link * link,struct ata_device ** unused)37 static int rz1000_set_mode(struct ata_link *link, struct ata_device **unused)
38 {
39 struct ata_device *dev;
40
41 ata_for_each_dev(dev, link, ENABLED) {
42 /* We don't really care */
43 dev->pio_mode = XFER_PIO_0;
44 dev->xfer_mode = XFER_PIO_0;
45 dev->xfer_shift = ATA_SHIFT_PIO;
46 dev->flags |= ATA_DFLAG_PIO;
47 ata_dev_info(dev, "configured for PIO\n");
48 }
49 return 0;
50 }
51
52
53 static const struct scsi_host_template rz1000_sht = {
54 ATA_PIO_SHT(DRV_NAME),
55 };
56
57 static struct ata_port_operations rz1000_port_ops = {
58 .inherits = &ata_sff_port_ops,
59 .cable_detect = ata_cable_40wire,
60 .set_mode = rz1000_set_mode,
61 };
62
rz1000_fifo_disable(struct pci_dev * pdev)63 static int rz1000_fifo_disable(struct pci_dev *pdev)
64 {
65 u16 reg;
66 /* Be exceptionally paranoid as we must be sure to apply the fix */
67 if (pci_read_config_word(pdev, 0x40, ®) != 0)
68 return -1;
69 reg &= 0xDFFF;
70 if (pci_write_config_word(pdev, 0x40, reg) != 0)
71 return -1;
72 dev_info(&pdev->dev, "disabled chipset readahead.\n");
73 return 0;
74 }
75
76 /**
77 * rz1000_init_one - Register RZ1000 ATA PCI device with kernel services
78 * @pdev: PCI device to register
79 * @ent: Entry in rz1000_pci_tbl matching with @pdev
80 *
81 * Configure an RZ1000 interface. This doesn't require much special
82 * handling except that we *MUST* kill the chipset readahead or the
83 * user may experience data corruption.
84 */
85
rz1000_init_one(struct pci_dev * pdev,const struct pci_device_id * ent)86 static int rz1000_init_one (struct pci_dev *pdev, const struct pci_device_id *ent)
87 {
88 static const struct ata_port_info info = {
89 .flags = ATA_FLAG_SLAVE_POSS,
90 .pio_mask = ATA_PIO4,
91 .port_ops = &rz1000_port_ops
92 };
93 const struct ata_port_info *ppi[] = { &info, NULL };
94
95 ata_print_version_once(&pdev->dev, DRV_VERSION);
96
97 if (rz1000_fifo_disable(pdev) == 0)
98 return ata_pci_sff_init_one(pdev, ppi, &rz1000_sht, NULL, 0);
99
100 dev_err(&pdev->dev, "failed to disable read-ahead on chipset.\n");
101 /* Not safe to use so skip */
102 return -ENODEV;
103 }
104
105 #ifdef CONFIG_PM_SLEEP
rz1000_reinit_one(struct pci_dev * pdev)106 static int rz1000_reinit_one(struct pci_dev *pdev)
107 {
108 struct ata_host *host = pci_get_drvdata(pdev);
109 int rc;
110
111 rc = ata_pci_device_do_resume(pdev);
112 if (rc)
113 return rc;
114
115 /* If this fails on resume (which is a "can't happen" case), we
116 must stop as any progress risks data loss */
117 if (rz1000_fifo_disable(pdev))
118 panic("rz1000 fifo");
119
120 ata_host_resume(host);
121 return 0;
122 }
123 #endif
124
125 static const struct pci_device_id pata_rz1000[] = {
126 { PCI_VDEVICE(PCTECH, PCI_DEVICE_ID_PCTECH_RZ1000), },
127 { PCI_VDEVICE(PCTECH, PCI_DEVICE_ID_PCTECH_RZ1001), },
128
129 { },
130 };
131
132 static struct pci_driver rz1000_pci_driver = {
133 .name = DRV_NAME,
134 .id_table = pata_rz1000,
135 .probe = rz1000_init_one,
136 .remove = ata_pci_remove_one,
137 #ifdef CONFIG_PM_SLEEP
138 .suspend = ata_pci_device_suspend,
139 .resume = rz1000_reinit_one,
140 #endif
141 };
142
143 module_pci_driver(rz1000_pci_driver);
144
145 MODULE_AUTHOR("Alan Cox");
146 MODULE_DESCRIPTION("low-level driver for RZ1000 PCI ATA");
147 MODULE_LICENSE("GPL");
148 MODULE_DEVICE_TABLE(pci, pata_rz1000);
149 MODULE_VERSION(DRV_VERSION);
150