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 | |
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, bits: &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 | |
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(dev: pdev, where: port + 3, val: &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(dev: pdev, where: port, val: idetcr); |
86 | pci_write_config_byte(dev: pdev, where: port + 3, val: 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 | |
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 | |
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(pdev: dev, ppi, sht: &ns87410_sht, NULL, hflags: 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 | |