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 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