xref: /openbmc/linux/drivers/ata/pata_ns87410.c (revision 25df73d9)
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 
ns87410_pre_reset(struct ata_link * link,unsigned long deadline)26 static 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 
ns87410_set_piomode(struct ata_port * ap,struct ata_device * adev)50 static 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 
ns87410_qc_issue(struct ata_queued_cmd * qc)101 static 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 
117 static const struct scsi_host_template ns87410_sht = {
118 	ATA_PIO_SHT(DRV_NAME),
119 };
120 
121 static 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 
ns87410_init_one(struct pci_dev * dev,const struct pci_device_id * id)129 static 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 
140 static const struct pci_device_id ns87410[] = {
141 	{ PCI_VDEVICE(NS, PCI_DEVICE_ID_NS_87410), },
142 
143 	{ },
144 };
145 
146 static 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 
157 module_pci_driver(ns87410_pci_driver);
158 
159 MODULE_AUTHOR("Alan Cox");
160 MODULE_DESCRIPTION("low-level driver for Nat Semi 87410");
161 MODULE_LICENSE("GPL");
162 MODULE_DEVICE_TABLE(pci, ns87410);
163 MODULE_VERSION(DRV_VERSION);
164