1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * pata_ns87410.c 	- National Semiconductor 87410 PATA for new ATA layer
4 *			  (C) 2006 Red Hat Inc
5 */
6
7#include <linux/kernel.h>
8#include <linux/module.h>
9#include <linux/pci.h>
10#include <linux/blkdev.h>
11#include <linux/delay.h>
12#include <scsi/scsi_host.h>
13#include <linux/libata.h>
14
15#define DRV_NAME "pata_ns87410"
16#define DRV_VERSION "0.4.6"
17
18/**
19 *	ns87410_pre_reset		-	probe begin
20 *	@link: ATA link
21 *	@deadline: deadline jiffies for the operation
22 *
23 *	Check enabled ports
24 */
25
26static int ns87410_pre_reset(struct ata_link *link, unsigned long deadline)
27{
28	struct ata_port *ap = link->ap;
29	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
30	static const struct pci_bits ns87410_enable_bits[] = {
31		{ 0x43, 1, 0x08, 0x08 },
32		{ 0x47, 1, 0x08, 0x08 }
33	};
34
35	if (!pci_test_config_bits(pdev, &ns87410_enable_bits[ap->port_no]))
36		return -ENOENT;
37
38	return ata_sff_prereset(link, deadline);
39}
40
41/**
42 *	ns87410_set_piomode	-	set initial PIO mode data
43 *	@ap: ATA interface
44 *	@adev: ATA device
45 *
46 *	Program timing data. This is kept per channel not per device,
47 *	and only affects the data port.
48 */
49
50static void ns87410_set_piomode(struct ata_port *ap, struct ata_device *adev)
51{
52	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
53	int port = 0x40 + 4 * ap->port_no;
54	u8 idetcr, idefr;
55	struct ata_timing at;
56
57	static const u8 activebits[15] = {
58		0, 1, 2, 3, 4,
59		5, 5, 6, 6, 6,
60		6, 7, 7, 7, 7
61	};
62
63	static const u8 recoverbits[12] = {
64		0, 1, 2, 3, 4, 5, 6, 6, 7, 7, 7, 7
65	};
66
67	pci_read_config_byte(pdev, port + 3, &idefr);
68
69	if (ata_pio_need_iordy(adev))
70		idefr |= 0x04;	/* IORDY enable */
71	else
72		idefr &= ~0x04;
73
74	if (ata_timing_compute(adev, adev->pio_mode, &at, 30303, 1) < 0) {
75		dev_err(&pdev->dev, "unknown mode %d\n", adev->pio_mode);
76		return;
77	}
78
79	at.active = clamp_val(at.active, 2, 16) - 2;
80	at.setup = clamp_val(at.setup, 1, 4) - 1;
81	at.recover = clamp_val(at.recover, 1, 12) - 1;
82
83	idetcr = (at.setup << 6) | (recoverbits[at.recover] << 3) | activebits[at.active];
84
85	pci_write_config_byte(pdev, port, idetcr);
86	pci_write_config_byte(pdev, port + 3, idefr);
87	/* We use ap->private_data as a pointer to the device currently
88	   loaded for timing */
89	ap->private_data = adev;
90}
91
92/**
93 *	ns87410_qc_issue	-	command issue
94 *	@qc: command pending
95 *
96 *	Called when the libata layer is about to issue a command. We wrap
97 *	this interface so that we can load the correct ATA timings if
98 *	necessary.
99 */
100
101static unsigned int ns87410_qc_issue(struct ata_queued_cmd *qc)
102{
103	struct ata_port *ap = qc->ap;
104	struct ata_device *adev = qc->dev;
105
106	/* If modes have been configured and the channel data is not loaded
107	   then load it. We have to check if pio_mode is set as the core code
108	   does not set adev->pio_mode to XFER_PIO_0 while probing as would be
109	   logical */
110
111	if (adev->pio_mode && adev != ap->private_data)
112		ns87410_set_piomode(ap, adev);
113
114	return ata_sff_qc_issue(qc);
115}
116
117static const struct scsi_host_template ns87410_sht = {
118	ATA_PIO_SHT(DRV_NAME),
119};
120
121static struct ata_port_operations ns87410_port_ops = {
122	.inherits	= &ata_sff_port_ops,
123	.qc_issue	= ns87410_qc_issue,
124	.cable_detect	= ata_cable_40wire,
125	.set_piomode	= ns87410_set_piomode,
126	.prereset	= ns87410_pre_reset,
127};
128
129static int ns87410_init_one(struct pci_dev *dev, const struct pci_device_id *id)
130{
131	static const struct ata_port_info info = {
132		.flags = ATA_FLAG_SLAVE_POSS,
133		.pio_mask = ATA_PIO3,
134		.port_ops = &ns87410_port_ops
135	};
136	const struct ata_port_info *ppi[] = { &info, NULL };
137	return ata_pci_sff_init_one(dev, ppi, &ns87410_sht, NULL, 0);
138}
139
140static const struct pci_device_id ns87410[] = {
141	{ PCI_VDEVICE(NS, PCI_DEVICE_ID_NS_87410), },
142
143	{ },
144};
145
146static struct pci_driver ns87410_pci_driver = {
147	.name 		= DRV_NAME,
148	.id_table	= ns87410,
149	.probe 		= ns87410_init_one,
150	.remove		= ata_pci_remove_one,
151#ifdef CONFIG_PM_SLEEP
152	.suspend	= ata_pci_device_suspend,
153	.resume		= ata_pci_device_resume,
154#endif
155};
156
157module_pci_driver(ns87410_pci_driver);
158
159MODULE_AUTHOR("Alan Cox");
160MODULE_DESCRIPTION("low-level driver for Nat Semi 87410");
161MODULE_LICENSE("GPL");
162MODULE_DEVICE_TABLE(pci, ns87410);
163MODULE_VERSION(DRV_VERSION);
164