tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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"
24#define DRV_VERSION "0.2.2"
25
26
27/**
28 * rz1000_prereset - probe begin
29 * @ap: ATA port
30 *
31 * Set up cable type and use generics
32 */
33
34static int rz1000_prereset(struct ata_port *ap)
35{
36 ap->cbl = ATA_CBL_PATA40;
37 return ata_std_prereset(ap);
38}
39
40/**
41 * rz1000_error_handler - probe reset
42 * @ap: ATA port
43 *
44 * Perform the ATA standard reset sequence
45 */
46
47static void rz1000_error_handler(struct ata_port *ap)
48{
49 ata_bmdma_drive_eh(ap, rz1000_prereset, ata_std_softreset, NULL, ata_std_postreset);
50}
51
52/**
53 * rz1000_set_mode - mode setting function
54 * @ap: ATA interface
55 *
56 * Use a non standard set_mode function. We don't want to be tuned. We
57 * would prefer to be BIOS generic but for the fact our hardware is
58 * whacked out.
59 */
60
61static void rz1000_set_mode(struct ata_port *ap)
62{
63 int i;
64
65 for (i = 0; i < ATA_MAX_DEVICES; i++) {
66 struct ata_device *dev = &ap->device[i];
67 if (ata_dev_enabled(dev)) {
68 /* We don't really care */
69 dev->pio_mode = XFER_PIO_0;
70 dev->xfer_mode = XFER_PIO_0;
71 dev->xfer_shift = ATA_SHIFT_PIO;
72 dev->flags |= ATA_DFLAG_PIO;
73 }
74 }
75}
76
77
78static struct scsi_host_template rz1000_sht = {
79 .module = THIS_MODULE,
80 .name = DRV_NAME,
81 .ioctl = ata_scsi_ioctl,
82 .queuecommand = ata_scsi_queuecmd,
83 .can_queue = ATA_DEF_QUEUE,
84 .this_id = ATA_SHT_THIS_ID,
85 .sg_tablesize = LIBATA_MAX_PRD,
86 .max_sectors = ATA_MAX_SECTORS,
87 .cmd_per_lun = ATA_SHT_CMD_PER_LUN,
88 .emulated = ATA_SHT_EMULATED,
89 .use_clustering = ATA_SHT_USE_CLUSTERING,
90 .proc_name = DRV_NAME,
91 .dma_boundary = ATA_DMA_BOUNDARY,
92 .slave_configure = ata_scsi_slave_config,
93 .bios_param = ata_std_bios_param,
94};
95
96static struct ata_port_operations rz1000_port_ops = {
97 .set_mode = rz1000_set_mode,
98
99 .port_disable = ata_port_disable,
100 .tf_load = ata_tf_load,
101 .tf_read = ata_tf_read,
102 .check_status = ata_check_status,
103 .exec_command = ata_exec_command,
104 .dev_select = ata_std_dev_select,
105
106 .error_handler = rz1000_error_handler,
107
108 .bmdma_setup = ata_bmdma_setup,
109 .bmdma_start = ata_bmdma_start,
110 .bmdma_stop = ata_bmdma_stop,
111 .bmdma_status = ata_bmdma_status,
112
113 .qc_prep = ata_qc_prep,
114 .qc_issue = ata_qc_issue_prot,
115
116 .data_xfer = ata_pio_data_xfer,
117
118 .freeze = ata_bmdma_freeze,
119 .thaw = ata_bmdma_thaw,
120 .error_handler = rz1000_error_handler,
121 .post_internal_cmd = ata_bmdma_post_internal_cmd,
122
123 .irq_handler = ata_interrupt,
124 .irq_clear = ata_bmdma_irq_clear,
125
126 .port_start = ata_port_start,
127 .port_stop = ata_port_stop,
128 .host_stop = ata_host_stop
129};
130
131/**
132 * rz1000_init_one - Register RZ1000 ATA PCI device with kernel services
133 * @pdev: PCI device to register
134 * @ent: Entry in rz1000_pci_tbl matching with @pdev
135 *
136 * Configure an RZ1000 interface. This doesn't require much special
137 * handling except that we *MUST* kill the chipset readahead or the
138 * user may experience data corruption.
139 */
140
141static int rz1000_init_one (struct pci_dev *pdev, const struct pci_device_id *ent)
142{
143 static int printed_version;
144 struct ata_port_info *port_info[2];
145 u16 reg;
146 static struct ata_port_info info = {
147 .sht = &rz1000_sht,
148 .flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST,
149 .pio_mask = 0x1f,
150 .port_ops = &rz1000_port_ops
151 };
152
153 if (!printed_version++)
154 printk(KERN_DEBUG DRV_NAME " version " DRV_VERSION "\n");
155
156 /* Be exceptionally paranoid as we must be sure to apply the fix */
157 if (pci_read_config_word(pdev, 0x40, ®) != 0)
158 goto fail;
159 reg &= 0xDFFF;
160 if (pci_write_config_word(pdev, 0x40, reg) != 0)
161 goto fail;
162 printk(KERN_INFO DRV_NAME ": disabled chipset readahead.\n");
163
164 port_info[0] = &info;
165 port_info[1] = &info;
166 return ata_pci_init_one(pdev, port_info, 2);
167fail:
168 printk(KERN_ERR DRV_NAME ": failed to disable read-ahead on chipset..\n");
169 /* Not safe to use so skip */
170 return -ENODEV;
171}
172
173static const struct pci_device_id pata_rz1000[] = {
174 { PCI_VDEVICE(PCTECH, PCI_DEVICE_ID_PCTECH_RZ1000), },
175 { PCI_VDEVICE(PCTECH, PCI_DEVICE_ID_PCTECH_RZ1001), },
176
177 { },
178};
179
180static struct pci_driver rz1000_pci_driver = {
181 .name = DRV_NAME,
182 .id_table = pata_rz1000,
183 .probe = rz1000_init_one,
184 .remove = ata_pci_remove_one
185};
186
187static int __init rz1000_init(void)
188{
189 return pci_register_driver(&rz1000_pci_driver);
190}
191
192static void __exit rz1000_exit(void)
193{
194 pci_unregister_driver(&rz1000_pci_driver);
195}
196
197MODULE_AUTHOR("Alan Cox");
198MODULE_DESCRIPTION("low-level driver for RZ1000 PCI ATA");
199MODULE_LICENSE("GPL");
200MODULE_DEVICE_TABLE(pci, pata_rz1000);
201MODULE_VERSION(DRV_VERSION);
202
203module_init(rz1000_init);
204module_exit(rz1000_exit);
205