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669a5db4 JG |
1 | /* |
2 | * RZ1000/1001 driver based upon | |
3 | * | |
4 | * linux/drivers/ide/pci/rz1000.c Version 0.06 January 12, 2003 | |
5 | * Copyright (C) 1995-1998 Linus Torvalds & author (see below) | |
6 | * Principal Author: mlord@pobox.com (Mark Lord) | |
7 | * | |
8 | * See linux/MAINTAINERS for address of current maintainer. | |
9 | * | |
10 | * This file provides support for disabling the buggy read-ahead | |
11 | * mode of the RZ1000 IDE chipset, commonly used on Intel motherboards. | |
12 | */ | |
13 | ||
14 | #include <linux/kernel.h> | |
15 | #include <linux/module.h> | |
16 | #include <linux/pci.h> | |
17 | #include <linux/init.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" | |
8bc3fc47 | 24 | #define DRV_VERSION "0.2.4" |
669a5db4 JG |
25 | |
26 | ||
669a5db4 JG |
27 | /** |
28 | * rz1000_set_mode - mode setting function | |
0260731f | 29 | * @link: ATA link |
b229a7b0 | 30 | * @unused: returned device on set_mode failure |
669a5db4 JG |
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 | ||
0260731f | 37 | static int rz1000_set_mode(struct ata_link *link, struct ata_device **unused) |
669a5db4 | 38 | { |
f58229f8 | 39 | struct ata_device *dev; |
669a5db4 | 40 | |
1eca4365 TH |
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; | |
a9a79dfe | 47 | ata_dev_info(dev, "configured for PIO\n"); |
669a5db4 | 48 | } |
b229a7b0 | 49 | return 0; |
669a5db4 JG |
50 | } |
51 | ||
52 | ||
53 | static struct scsi_host_template rz1000_sht = { | |
68d1d07b | 54 | ATA_PIO_SHT(DRV_NAME), |
669a5db4 JG |
55 | }; |
56 | ||
57 | static struct ata_port_operations rz1000_port_ops = { | |
029cfd6b | 58 | .inherits = &ata_sff_port_ops, |
2a25dfe4 | 59 | .cable_detect = ata_cable_40wire, |
029cfd6b | 60 | .set_mode = rz1000_set_mode, |
669a5db4 JG |
61 | }; |
62 | ||
ad4a42d2 AC |
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 | printk(KERN_INFO DRV_NAME ": disabled chipset readahead.\n"); | |
73 | return 0; | |
74 | } | |
75 | ||
669a5db4 JG |
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 | { | |
1626aeb8 | 88 | static const struct ata_port_info info = { |
1d2808fd | 89 | .flags = ATA_FLAG_SLAVE_POSS, |
14bdef98 | 90 | .pio_mask = ATA_PIO4, |
669a5db4 JG |
91 | .port_ops = &rz1000_port_ops |
92 | }; | |
1626aeb8 | 93 | const struct ata_port_info *ppi[] = { &info, NULL }; |
669a5db4 | 94 | |
06296a1e | 95 | ata_print_version_once(&pdev->dev, DRV_VERSION); |
669a5db4 | 96 | |
1626aeb8 | 97 | if (rz1000_fifo_disable(pdev) == 0) |
16ea0fc9 | 98 | return ata_pci_sff_init_one(pdev, ppi, &rz1000_sht, NULL, 0); |
1626aeb8 | 99 | |
669a5db4 JG |
100 | printk(KERN_ERR DRV_NAME ": failed to disable read-ahead on chipset..\n"); |
101 | /* Not safe to use so skip */ | |
102 | return -ENODEV; | |
103 | } | |
104 | ||
438ac6d5 | 105 | #ifdef CONFIG_PM |
ad4a42d2 AC |
106 | static int rz1000_reinit_one(struct pci_dev *pdev) |
107 | { | |
0a86e1c8 | 108 | struct ata_host *host = pci_get_drvdata(pdev); |
0826ef5f BZ |
109 | int rc; |
110 | ||
111 | rc = ata_pci_device_do_resume(pdev); | |
112 | if (rc) | |
113 | return rc; | |
114 | ||
25985edc | 115 | /* If this fails on resume (which is a "can't happen" case), we |
ad4a42d2 AC |
116 | must stop as any progress risks data loss */ |
117 | if (rz1000_fifo_disable(pdev)) | |
118 | panic("rz1000 fifo"); | |
0826ef5f BZ |
119 | |
120 | ata_host_resume(host); | |
121 | return 0; | |
ad4a42d2 | 122 | } |
438ac6d5 | 123 | #endif |
ad4a42d2 | 124 | |
2d2744fc JG |
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 | { }, | |
669a5db4 JG |
130 | }; |
131 | ||
132 | static struct pci_driver rz1000_pci_driver = { | |
2d2744fc | 133 | .name = DRV_NAME, |
669a5db4 JG |
134 | .id_table = pata_rz1000, |
135 | .probe = rz1000_init_one, | |
ad4a42d2 | 136 | .remove = ata_pci_remove_one, |
438ac6d5 | 137 | #ifdef CONFIG_PM |
ad4a42d2 AC |
138 | .suspend = ata_pci_device_suspend, |
139 | .resume = rz1000_reinit_one, | |
438ac6d5 | 140 | #endif |
669a5db4 JG |
141 | }; |
142 | ||
2fc75da0 | 143 | module_pci_driver(rz1000_pci_driver); |
669a5db4 JG |
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); |