pata_opti.c revision 887125e3740283be25564bfc6fb5d24974b651ab 
1/*
2 * pata_opti.c 	- ATI PATA for new ATA layer
3 *			  (C) 2005 Red Hat Inc
4 *			  Alan Cox <alan@redhat.com>
5 *
6 * Based on
7 *  linux/drivers/ide/pci/opti621.c		Version 0.7	Sept 10, 2002
8 *
9 *  Copyright (C) 1996-1998  Linus Torvalds & authors (see below)
10 *
11 * Authors:
12 * Jaromir Koutek <miri@punknet.cz>,
13 * Jan Harkes <jaharkes@cwi.nl>,
14 * Mark Lord <mlord@pobox.com>
15 * Some parts of code are from ali14xx.c and from rz1000.c.
16 *
17 * Also consulted the FreeBSD prototype driver by Kevin Day to try
18 * and resolve some confusions. Further documentation can be found in
19 * Ralf Brown's interrupt list
20 *
21 * If you have other variants of the Opti range (Viper/Vendetta) please
22 * try this driver with those PCI idents and report back. For the later
23 * chips see the pata_optidma driver
24 *
25 */
26
27#include <linux/kernel.h>
28#include <linux/module.h>
29#include <linux/pci.h>
30#include <linux/init.h>
31#include <linux/blkdev.h>
32#include <linux/delay.h>
33#include <scsi/scsi_host.h>
34#include <linux/libata.h>
35
36#define DRV_NAME "pata_opti"
37#define DRV_VERSION "0.2.9"
38
39enum {
40	READ_REG	= 0,	/* index of Read cycle timing register */
41	WRITE_REG 	= 1,	/* index of Write cycle timing register */
42	CNTRL_REG 	= 3,	/* index of Control register */
43	STRAP_REG 	= 5,	/* index of Strap register */
44	MISC_REG 	= 6	/* index of Miscellaneous register */
45};
46
47/**
48 *	opti_pre_reset		-	probe begin
49 *	@link: ATA link
50 *	@deadline: deadline jiffies for the operation
51 *
52 *	Set up cable type and use generic probe init
53 */
54
55static int opti_pre_reset(struct ata_link *link, unsigned long deadline)
56{
57	struct ata_port *ap = link->ap;
58	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
59	static const struct pci_bits opti_enable_bits[] = {
60		{ 0x45, 1, 0x80, 0x00 },
61		{ 0x40, 1, 0x08, 0x00 }
62	};
63
64	if (!pci_test_config_bits(pdev, &opti_enable_bits[ap->port_no]))
65		return -ENOENT;
66
67	return ata_std_prereset(link, deadline);
68}
69
70/**
71 *	opti_probe_reset		-	probe reset
72 *	@ap: ATA port
73 *
74 *	Perform the ATA probe and bus reset sequence plus specific handling
75 *	for this hardware. The Opti needs little handling - we have no UDMA66
76 *	capability that needs cable detection. All we must do is check the port
77 *	is enabled.
78 */
79
80static void opti_error_handler(struct ata_port *ap)
81{
82	ata_bmdma_drive_eh(ap, opti_pre_reset, ata_std_softreset, NULL, ata_std_postreset);
83}
84
85/**
86 *	opti_write_reg		-	control register setup
87 *	@ap: ATA port
88 *	@value: value
89 *	@reg: control register number
90 *
91 *	The Opti uses magic 'trapdoor' register accesses to do configuration
92 *	rather than using PCI space as other controllers do. The double inw
93 *	on the error register activates configuration mode. We can then write
94 *	the control register
95 */
96
97static void opti_write_reg(struct ata_port *ap, u8 val, int reg)
98{
99	void __iomem *regio = ap->ioaddr.cmd_addr;
100
101	/* These 3 unlock the control register access */
102	ioread16(regio + 1);
103	ioread16(regio + 1);
104	iowrite8(3, regio + 2);
105
106	/* Do the I/O */
107	iowrite8(val, regio + reg);
108
109	/* Relock */
110	iowrite8(0x83, regio + 2);
111}
112
113/**
114 *	opti_set_piomode	-	set initial PIO mode data
115 *	@ap: ATA interface
116 *	@adev: ATA device
117 *
118 *	Called to do the PIO mode setup. Timing numbers are taken from
119 *	the FreeBSD driver then pre computed to keep the code clean. There
120 *	are two tables depending on the hardware clock speed.
121 */
122
123static void opti_set_piomode(struct ata_port *ap, struct ata_device *adev)
124{
125	struct ata_device *pair = ata_dev_pair(adev);
126	int clock;
127	int pio = adev->pio_mode - XFER_PIO_0;
128	void __iomem *regio = ap->ioaddr.cmd_addr;
129	u8 addr;
130
131	/* Address table precomputed with prefetch off and a DCLK of 2 */
132	static const u8 addr_timing[2][5] = {
133		{ 0x30, 0x20, 0x20, 0x10, 0x10 },
134		{ 0x20, 0x20, 0x10, 0x10, 0x10 }
135	};
136	static const u8 data_rec_timing[2][5] = {
137		{ 0x6B, 0x56, 0x42, 0x32, 0x31 },
138		{ 0x58, 0x44, 0x32, 0x22, 0x21 }
139	};
140
141	iowrite8(0xff, regio + 5);
142	clock = ioread16(regio + 5) & 1;
143
144	/*
145 	 *	As with many controllers the address setup time is shared
146 	 *	and must suit both devices if present.
147	 */
148
149	addr = addr_timing[clock][pio];
150	if (pair) {
151		/* Hardware constraint */
152		u8 pair_addr = addr_timing[clock][pair->pio_mode - XFER_PIO_0];
153		if (pair_addr > addr)
154			addr = pair_addr;
155	}
156
157	/* Commence primary programming sequence */
158	opti_write_reg(ap, adev->devno, MISC_REG);
159	opti_write_reg(ap, data_rec_timing[clock][pio], READ_REG);
160	opti_write_reg(ap, data_rec_timing[clock][pio], WRITE_REG);
161	opti_write_reg(ap, addr, MISC_REG);
162
163	/* Programming sequence complete, override strapping */
164	opti_write_reg(ap, 0x85, CNTRL_REG);
165}
166
167static struct scsi_host_template opti_sht = {
168	ATA_PIO_SHT(DRV_NAME),
169};
170
171static struct ata_port_operations opti_port_ops = {
172	.inherits	= &ata_sff_port_ops,
173	.cable_detect	= ata_cable_40wire,
174	.set_piomode	= opti_set_piomode,
175	.error_handler	= opti_error_handler,
176};
177
178static int opti_init_one(struct pci_dev *dev, const struct pci_device_id *id)
179{
180	static const struct ata_port_info info = {
181		.flags = ATA_FLAG_SLAVE_POSS,
182		.pio_mask = 0x1f,
183		.port_ops = &opti_port_ops
184	};
185	const struct ata_port_info *ppi[] = { &info, NULL };
186	static int printed_version;
187
188	if (!printed_version++)
189		dev_printk(KERN_DEBUG, &dev->dev, "version " DRV_VERSION "\n");
190
191	return ata_pci_init_one(dev, ppi, &opti_sht, NULL);
192}
193
194static const struct pci_device_id opti[] = {
195	{ PCI_VDEVICE(OPTI, PCI_DEVICE_ID_OPTI_82C621), 0 },
196	{ PCI_VDEVICE(OPTI, PCI_DEVICE_ID_OPTI_82C825), 1 },
197
198	{ },
199};
200
201static struct pci_driver opti_pci_driver = {
202	.name 		= DRV_NAME,
203	.id_table	= opti,
204	.probe 		= opti_init_one,
205	.remove		= ata_pci_remove_one,
206#ifdef CONFIG_PM
207	.suspend	= ata_pci_device_suspend,
208	.resume		= ata_pci_device_resume,
209#endif
210};
211
212static int __init opti_init(void)
213{
214	return pci_register_driver(&opti_pci_driver);
215}
216
217static void __exit opti_exit(void)
218{
219	pci_unregister_driver(&opti_pci_driver);
220}
221
222
223MODULE_AUTHOR("Alan Cox");
224MODULE_DESCRIPTION("low-level driver for Opti 621/621X");
225MODULE_LICENSE("GPL");
226MODULE_DEVICE_TABLE(pci, opti);
227MODULE_VERSION(DRV_VERSION);
228
229module_init(opti_init);
230module_exit(opti_exit);
231