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	"0.2.4"
25
26
27/**
28 *	rz1000_set_mode		-	mode setting function
29 *	@ap: ATA interface
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
37static int rz1000_set_mode(struct ata_port *ap, struct ata_device **unused)
38{
39	int i;
40
41	for (i = 0; i < ATA_MAX_DEVICES; i++) {
42		struct ata_device *dev = &ap->device[i];
43		if (ata_dev_enabled(dev)) {
44			/* We don't really care */
45			dev->pio_mode = XFER_PIO_0;
46			dev->xfer_mode = XFER_PIO_0;
47			dev->xfer_shift = ATA_SHIFT_PIO;
48			dev->flags |= ATA_DFLAG_PIO;
49			ata_dev_printk(dev, KERN_INFO, "configured for PIO\n");
50		}
51	}
52	return 0;
53}
54
55
56static struct scsi_host_template rz1000_sht = {
57	.module			= THIS_MODULE,
58	.name			= DRV_NAME,
59	.ioctl			= ata_scsi_ioctl,
60	.queuecommand		= ata_scsi_queuecmd,
61	.can_queue		= ATA_DEF_QUEUE,
62	.this_id		= ATA_SHT_THIS_ID,
63	.sg_tablesize		= LIBATA_MAX_PRD,
64	.cmd_per_lun		= ATA_SHT_CMD_PER_LUN,
65	.emulated		= ATA_SHT_EMULATED,
66	.use_clustering		= ATA_SHT_USE_CLUSTERING,
67	.proc_name		= DRV_NAME,
68	.dma_boundary		= ATA_DMA_BOUNDARY,
69	.slave_configure	= ata_scsi_slave_config,
70	.slave_destroy		= ata_scsi_slave_destroy,
71	.bios_param		= ata_std_bios_param,
72};
73
74static struct ata_port_operations rz1000_port_ops = {
75	.set_mode	= rz1000_set_mode,
76
77	.port_disable	= ata_port_disable,
78	.tf_load	= ata_tf_load,
79	.tf_read	= ata_tf_read,
80	.check_status 	= ata_check_status,
81	.exec_command	= ata_exec_command,
82	.dev_select 	= ata_std_dev_select,
83
84	.bmdma_setup 	= ata_bmdma_setup,
85	.bmdma_start 	= ata_bmdma_start,
86	.bmdma_stop	= ata_bmdma_stop,
87	.bmdma_status 	= ata_bmdma_status,
88
89	.qc_prep 	= ata_qc_prep,
90	.qc_issue	= ata_qc_issue_prot,
91
92	.data_xfer	= ata_data_xfer,
93
94	.freeze		= ata_bmdma_freeze,
95	.thaw		= ata_bmdma_thaw,
96	.error_handler	= ata_bmdma_error_handler,
97	.post_internal_cmd = ata_bmdma_post_internal_cmd,
98	.cable_detect	= ata_cable_40wire,
99
100	.irq_handler	= ata_interrupt,
101	.irq_clear	= ata_bmdma_irq_clear,
102	.irq_on		= ata_irq_on,
103	.irq_ack	= ata_irq_ack,
104
105	.port_start	= ata_port_start,
106};
107
108static int rz1000_fifo_disable(struct pci_dev *pdev)
109{
110	u16 reg;
111	/* Be exceptionally paranoid as we must be sure to apply the fix */
112	if (pci_read_config_word(pdev, 0x40, &reg) != 0)
113		return -1;
114	reg &= 0xDFFF;
115	if (pci_write_config_word(pdev, 0x40, reg) != 0)
116		return -1;
117	printk(KERN_INFO DRV_NAME ": disabled chipset readahead.\n");
118	return 0;
119}
120
121/**
122 *	rz1000_init_one - Register RZ1000 ATA PCI device with kernel services
123 *	@pdev: PCI device to register
124 *	@ent: Entry in rz1000_pci_tbl matching with @pdev
125 *
126 *	Configure an RZ1000 interface. This doesn't require much special
127 *	handling except that we *MUST* kill the chipset readahead or the
128 *	user may experience data corruption.
129 */
130
131static int rz1000_init_one (struct pci_dev *pdev, const struct pci_device_id *ent)
132{
133	static int printed_version;
134	static const struct ata_port_info info = {
135		.sht = &rz1000_sht,
136		.flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST,
137		.pio_mask = 0x1f,
138		.port_ops = &rz1000_port_ops
139	};
140	const struct ata_port_info *ppi[] = { &info, NULL };
141
142	if (!printed_version++)
143		printk(KERN_DEBUG DRV_NAME " version " DRV_VERSION "\n");
144
145	if (rz1000_fifo_disable(pdev) == 0)
146		return ata_pci_init_one(pdev, ppi);
147
148	printk(KERN_ERR DRV_NAME ": failed to disable read-ahead on chipset..\n");
149	/* Not safe to use so skip */
150	return -ENODEV;
151}
152
153#ifdef CONFIG_PM
154static int rz1000_reinit_one(struct pci_dev *pdev)
155{
156	/* If this fails on resume (which is a "cant happen" case), we
157	   must stop as any progress risks data loss */
158	if (rz1000_fifo_disable(pdev))
159		panic("rz1000 fifo");
160	return ata_pci_device_resume(pdev);
161}
162#endif
163
164static const struct pci_device_id pata_rz1000[] = {
165	{ PCI_VDEVICE(PCTECH, PCI_DEVICE_ID_PCTECH_RZ1000), },
166	{ PCI_VDEVICE(PCTECH, PCI_DEVICE_ID_PCTECH_RZ1001), },
167
168	{ },
169};
170
171static struct pci_driver rz1000_pci_driver = {
172	.name 		= DRV_NAME,
173	.id_table	= pata_rz1000,
174	.probe 		= rz1000_init_one,
175	.remove		= ata_pci_remove_one,
176#ifdef CONFIG_PM
177	.suspend	= ata_pci_device_suspend,
178	.resume		= rz1000_reinit_one,
179#endif
180};
181
182static int __init rz1000_init(void)
183{
184	return pci_register_driver(&rz1000_pci_driver);
185}
186
187static void __exit rz1000_exit(void)
188{
189	pci_unregister_driver(&rz1000_pci_driver);
190}
191
192MODULE_AUTHOR("Alan Cox");
193MODULE_DESCRIPTION("low-level driver for RZ1000 PCI ATA");
194MODULE_LICENSE("GPL");
195MODULE_DEVICE_TABLE(pci, pata_rz1000);
196MODULE_VERSION(DRV_VERSION);
197
198module_init(rz1000_init);
199module_exit(rz1000_exit);
200