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1/*
2 * pata_ns87410.c 	- National Semiconductor 87410 PATA for new ATA layer
3 *			  (C) 2006 Red Hat Inc
4 *
5 *  This program is free software; you can redistribute it and/or modify
6 *  it under the terms of the GNU General Public License as published by
7 *  the Free Software Foundation; either version 2, or (at your option)
8 *  any later version.
9 *
10 *  This program is distributed in the hope that it will be useful,
11 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
12 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13 *  GNU General Public License for more details.
14 *
15 *  You should have received a copy of the GNU General Public License
16 *  along with this program; see the file COPYING.  If not, write to
17 *  the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
18 */
19
20#include <linux/kernel.h>
21#include <linux/module.h>
22#include <linux/pci.h>
23#include <linux/blkdev.h>
24#include <linux/delay.h>
25#include <scsi/scsi_host.h>
26#include <linux/libata.h>
27
28#define DRV_NAME "pata_ns87410"
29#define DRV_VERSION "0.4.6"
30
31/**
32 *	ns87410_pre_reset		-	probe begin
33 *	@link: ATA link
34 *	@deadline: deadline jiffies for the operation
35 *
36 *	Check enabled ports
37 */
38
39static int ns87410_pre_reset(struct ata_link *link, unsigned long deadline)
40{
41	struct ata_port *ap = link->ap;
42	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
43	static const struct pci_bits ns87410_enable_bits[] = {
44		{ 0x43, 1, 0x08, 0x08 },
45		{ 0x47, 1, 0x08, 0x08 }
46	};
47
48	if (!pci_test_config_bits(pdev, &ns87410_enable_bits[ap->port_no]))
49		return -ENOENT;
50
51	return ata_sff_prereset(link, deadline);
52}
53
54/**
55 *	ns87410_set_piomode	-	set initial PIO mode data
56 *	@ap: ATA interface
57 *	@adev: ATA device
58 *
59 *	Program timing data. This is kept per channel not per device,
60 *	and only affects the data port.
61 */
62
63static void ns87410_set_piomode(struct ata_port *ap, struct ata_device *adev)
64{
65	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
66	int port = 0x40 + 4 * ap->port_no;
67	u8 idetcr, idefr;
68	struct ata_timing at;
69
70	static const u8 activebits[15] = {
71		0, 1, 2, 3, 4,
72		5, 5, 6, 6, 6,
73		6, 7, 7, 7, 7
74	};
75
76	static const u8 recoverbits[12] = {
77		0, 1, 2, 3, 4, 5, 6, 6, 7, 7, 7, 7
78	};
79
80	pci_read_config_byte(pdev, port + 3, &idefr);
81
82	if (ata_pio_need_iordy(adev))
83		idefr |= 0x04;	/* IORDY enable */
84	else
85		idefr &= ~0x04;
86
87	if (ata_timing_compute(adev, adev->pio_mode, &at, 30303, 1) < 0) {
88		dev_err(&pdev->dev, "unknown mode %d\n", adev->pio_mode);
89		return;
90	}
91
92	at.active = clamp_val(at.active, 2, 16) - 2;
93	at.setup = clamp_val(at.setup, 1, 4) - 1;
94	at.recover = clamp_val(at.recover, 1, 12) - 1;
95
96	idetcr = (at.setup << 6) | (recoverbits[at.recover] << 3) | activebits[at.active];
97
98	pci_write_config_byte(pdev, port, idetcr);
99	pci_write_config_byte(pdev, port + 3, idefr);
100	/* We use ap->private_data as a pointer to the device currently
101	   loaded for timing */
102	ap->private_data = adev;
103}
104
105/**
106 *	ns87410_qc_issue	-	command issue
107 *	@qc: command pending
108 *
109 *	Called when the libata layer is about to issue a command. We wrap
110 *	this interface so that we can load the correct ATA timings if
111 *	necessary.
112 */
113
114static unsigned int ns87410_qc_issue(struct ata_queued_cmd *qc)
115{
116	struct ata_port *ap = qc->ap;
117	struct ata_device *adev = qc->dev;
118
119	/* If modes have been configured and the channel data is not loaded
120	   then load it. We have to check if pio_mode is set as the core code
121	   does not set adev->pio_mode to XFER_PIO_0 while probing as would be
122	   logical */
123
124	if (adev->pio_mode && adev != ap->private_data)
125		ns87410_set_piomode(ap, adev);
126
127	return ata_sff_qc_issue(qc);
128}
129
130static struct scsi_host_template ns87410_sht = {
131	ATA_PIO_SHT(DRV_NAME),
132};
133
134static struct ata_port_operations ns87410_port_ops = {
135	.inherits	= &ata_sff_port_ops,
136	.qc_issue	= ns87410_qc_issue,
137	.cable_detect	= ata_cable_40wire,
138	.set_piomode	= ns87410_set_piomode,
139	.prereset	= ns87410_pre_reset,
140};
141
142static int ns87410_init_one(struct pci_dev *dev, const struct pci_device_id *id)
143{
144	static const struct ata_port_info info = {
145		.flags = ATA_FLAG_SLAVE_POSS,
146		.pio_mask = ATA_PIO3,
147		.port_ops = &ns87410_port_ops
148	};
149	const struct ata_port_info *ppi[] = { &info, NULL };
150	return ata_pci_sff_init_one(dev, ppi, &ns87410_sht, NULL, 0);
151}
152
153static const struct pci_device_id ns87410[] = {
154	{ PCI_VDEVICE(NS, PCI_DEVICE_ID_NS_87410), },
155
156	{ },
157};
158
159static struct pci_driver ns87410_pci_driver = {
160	.name 		= DRV_NAME,
161	.id_table	= ns87410,
162	.probe 		= ns87410_init_one,
163	.remove		= ata_pci_remove_one,
164#ifdef CONFIG_PM_SLEEP
165	.suspend	= ata_pci_device_suspend,
166	.resume		= ata_pci_device_resume,
167#endif
168};
169
170module_pci_driver(ns87410_pci_driver);
171
172MODULE_AUTHOR("Alan Cox");
173MODULE_DESCRIPTION("low-level driver for Nat Semi 87410");
174MODULE_LICENSE("GPL");
175MODULE_DEVICE_TABLE(pci, ns87410);
176MODULE_VERSION(DRV_VERSION);
177