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 | |
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 | |
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(dev: pdev, where: 0x40, val: ®) != 0) |
68 | return -1; |
69 | reg &= 0xDFFF; |
70 | if (pci_write_config_word(dev: pdev, where: 0x40, val: 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 | |
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, sht: &rz1000_sht, NULL, hflags: 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 |
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(fmt: "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 | |