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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/init.h> |
24 | #include <linux/blkdev.h> |
25 | #include <linux/delay.h> |
26 | #include <scsi/scsi_host.h> |
27 | #include <linux/libata.h> |
28 | |
29 | #define DRV_NAME "pata_ns87410" |
30 | #define DRV_VERSION "0.4.6" |
31 | |
32 | /** |
33 | * ns87410_pre_reset - probe begin |
34 | * @link: ATA link |
35 | * @deadline: deadline jiffies for the operation |
36 | * |
37 | * Check enabled ports |
38 | */ |
39 | |
40 | static int ns87410_pre_reset(struct ata_link *link, unsigned long deadline) |
41 | { |
42 | struct ata_port *ap = link->ap; |
43 | struct pci_dev *pdev = to_pci_dev(ap->host->dev); |
44 | static const struct pci_bits ns87410_enable_bits[] = { |
45 | { 0x43, 1, 0x08, 0x08 }, |
46 | { 0x47, 1, 0x08, 0x08 } |
47 | }; |
48 | |
49 | if (!pci_test_config_bits(pdev, &ns87410_enable_bits[ap->port_no])) |
50 | return -ENOENT; |
51 | |
52 | return ata_sff_prereset(link, deadline); |
53 | } |
54 | |
55 | /** |
56 | * ns87410_set_piomode - set initial PIO mode data |
57 | * @ap: ATA interface |
58 | * @adev: ATA device |
59 | * |
60 | * Program timing data. This is kept per channel not per device, |
61 | * and only affects the data port. |
62 | */ |
63 | |
64 | static void ns87410_set_piomode(struct ata_port *ap, struct ata_device *adev) |
65 | { |
66 | struct pci_dev *pdev = to_pci_dev(ap->host->dev); |
67 | int port = 0x40 + 4 * ap->port_no; |
68 | u8 idetcr, idefr; |
69 | struct ata_timing at; |
70 | |
71 | static const u8 activebits[15] = { |
72 | 0, 1, 2, 3, 4, |
73 | 5, 5, 6, 6, 6, |
74 | 6, 7, 7, 7, 7 |
75 | }; |
76 | |
77 | static const u8 recoverbits[12] = { |
78 | 0, 1, 2, 3, 4, 5, 6, 6, 7, 7, 7, 7 |
79 | }; |
80 | |
81 | pci_read_config_byte(pdev, port + 3, &idefr); |
82 | |
83 | if (ata_pio_need_iordy(adev)) |
84 | idefr |= 0x04; /* IORDY enable */ |
85 | else |
86 | idefr &= ~0x04; |
87 | |
88 | if (ata_timing_compute(adev, adev->pio_mode, &at, 30303, 1) < 0) { |
89 | dev_printk(KERN_ERR, &pdev->dev, "unknown mode %d.\n", adev->pio_mode); |
90 | return; |
91 | } |
92 | |
93 | at.active = clamp_val(at.active, 2, 16) - 2; |
94 | at.setup = clamp_val(at.setup, 1, 4) - 1; |
95 | at.recover = clamp_val(at.recover, 1, 12) - 1; |
96 | |
97 | idetcr = (at.setup << 6) | (recoverbits[at.recover] << 3) | activebits[at.active]; |
98 | |
99 | pci_write_config_byte(pdev, port, idetcr); |
100 | pci_write_config_byte(pdev, port + 3, idefr); |
101 | /* We use ap->private_data as a pointer to the device currently |
102 | loaded for timing */ |
103 | ap->private_data = adev; |
104 | } |
105 | |
106 | /** |
107 | * ns87410_qc_issue - command issue |
108 | * @qc: command pending |
109 | * |
110 | * Called when the libata layer is about to issue a command. We wrap |
111 | * this interface so that we can load the correct ATA timings if |
112 | * necessary. |
113 | */ |
114 | |
115 | static unsigned int ns87410_qc_issue(struct ata_queued_cmd *qc) |
116 | { |
117 | struct ata_port *ap = qc->ap; |
118 | struct ata_device *adev = qc->dev; |
119 | |
120 | /* If modes have been configured and the channel data is not loaded |
121 | then load it. We have to check if pio_mode is set as the core code |
122 | does not set adev->pio_mode to XFER_PIO_0 while probing as would be |
123 | logical */ |
124 | |
125 | if (adev->pio_mode && adev != ap->private_data) |
126 | ns87410_set_piomode(ap, adev); |
127 | |
128 | return ata_sff_qc_issue(qc); |
129 | } |
130 | |
131 | static struct scsi_host_template ns87410_sht = { |
132 | ATA_PIO_SHT(DRV_NAME), |
133 | }; |
134 | |
135 | static struct ata_port_operations ns87410_port_ops = { |
136 | .inherits = &ata_sff_port_ops, |
137 | .qc_issue = ns87410_qc_issue, |
138 | .cable_detect = ata_cable_40wire, |
139 | .set_piomode = ns87410_set_piomode, |
140 | .prereset = ns87410_pre_reset, |
141 | }; |
142 | |
143 | static int ns87410_init_one(struct pci_dev *dev, const struct pci_device_id *id) |
144 | { |
145 | static const struct ata_port_info info = { |
146 | .flags = ATA_FLAG_SLAVE_POSS, |
147 | .pio_mask = ATA_PIO3, |
148 | .port_ops = &ns87410_port_ops |
149 | }; |
150 | const struct ata_port_info *ppi[] = { &info, NULL }; |
151 | return ata_pci_sff_init_one(dev, ppi, &ns87410_sht, NULL, 0); |
152 | } |
153 | |
154 | static const struct pci_device_id ns87410[] = { |
155 | { PCI_VDEVICE(NS, PCI_DEVICE_ID_NS_87410), }, |
156 | |
157 | { }, |
158 | }; |
159 | |
160 | static struct pci_driver ns87410_pci_driver = { |
161 | .name = DRV_NAME, |
162 | .id_table = ns87410, |
163 | .probe = ns87410_init_one, |
164 | .remove = ata_pci_remove_one, |
165 | #ifdef CONFIG_PM |
166 | .suspend = ata_pci_device_suspend, |
167 | .resume = ata_pci_device_resume, |
168 | #endif |
169 | }; |
170 | |
171 | static int __init ns87410_init(void) |
172 | { |
173 | return pci_register_driver(&ns87410_pci_driver); |
174 | } |
175 | |
176 | static void __exit ns87410_exit(void) |
177 | { |
178 | pci_unregister_driver(&ns87410_pci_driver); |
179 | } |
180 | |
181 | MODULE_AUTHOR("Alan Cox"); |
182 | MODULE_DESCRIPTION("low-level driver for Nat Semi 87410"); |
183 | MODULE_LICENSE("GPL"); |
184 | MODULE_DEVICE_TABLE(pci, ns87410); |
185 | MODULE_VERSION(DRV_VERSION); |
186 | |
187 | module_init(ns87410_init); |
188 | module_exit(ns87410_exit); |
189 |
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