1 /*
2 * pata_triflex.c - Compaq PATA for new ATA layer
3 * (C) 2005 Red Hat Inc
4 * Alan Cox <alan@lxorguk.ukuu.org.uk>
5 *
6 * based upon
7 *
8 * triflex.c
9 *
10 * IDE Chipset driver for the Compaq TriFlex IDE controller.
11 *
12 * Known to work with the Compaq Workstation 5x00 series.
13 *
14 * Copyright (C) 2002 Hewlett-Packard Development Group, L.P.
15 * Author: Torben Mathiasen <torben.mathiasen@hp.com>
16 *
17 * This program is free software; you can redistribute it and/or modify
18 * it under the terms of the GNU General Public License version 2 as
19 * published by the Free Software Foundation.
20 *
21 * This program is distributed in the hope that it will be useful,
22 * but WITHOUT ANY WARRANTY; without even the implied warranty of
23 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
24 * GNU General Public License for more details.
25 *
26 * You should have received a copy of the GNU General Public License
27 * along with this program; if not, write to the Free Software
28 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
29 *
30 * Loosely based on the piix & svwks drivers.
31 *
32 * Documentation:
33 * Not publicly available.
34 */
35
36 #include <linux/kernel.h>
37 #include <linux/module.h>
38 #include <linux/pci.h>
39 #include <linux/init.h>
40 #include <linux/blkdev.h>
41 #include <linux/delay.h>
42 #include <scsi/scsi_host.h>
43 #include <linux/libata.h>
44
45 #define DRV_NAME "pata_triflex"
46 #define DRV_VERSION "0.2.8"
47
48 /**
49 * triflex_prereset - probe begin
50 * @link: ATA link
51 * @deadline: deadline jiffies for the operation
52 *
53 * Set up cable type and use generic probe init
54 */
55
triflex_prereset(struct ata_link * link,unsigned long deadline)56 static int triflex_prereset(struct ata_link *link, unsigned long deadline)
57 {
58 static const struct pci_bits triflex_enable_bits[] = {
59 { 0x80, 1, 0x01, 0x01 },
60 { 0x80, 1, 0x02, 0x02 }
61 };
62
63 struct ata_port *ap = link->ap;
64 struct pci_dev *pdev = to_pci_dev(ap->host->dev);
65
66 if (!pci_test_config_bits(pdev, &triflex_enable_bits[ap->port_no]))
67 return -ENOENT;
68
69 return ata_sff_prereset(link, deadline);
70 }
71
72
73
74 /**
75 * triflex_load_timing - timing configuration
76 * @ap: ATA interface
77 * @adev: Device on the bus
78 * @speed: speed to configure
79 *
80 * The Triflex has one set of timings per device per channel. This
81 * means we must do some switching. As the PIO and DMA timings don't
82 * match we have to do some reloading unlike PIIX devices where tuning
83 * tricks can avoid it.
84 */
85
triflex_load_timing(struct ata_port * ap,struct ata_device * adev,int speed)86 static void triflex_load_timing(struct ata_port *ap, struct ata_device *adev, int speed)
87 {
88 struct pci_dev *pdev = to_pci_dev(ap->host->dev);
89 u32 timing = 0;
90 u32 triflex_timing, old_triflex_timing;
91 int channel_offset = ap->port_no ? 0x74: 0x70;
92 unsigned int is_slave = (adev->devno != 0);
93
94
95 pci_read_config_dword(pdev, channel_offset, &old_triflex_timing);
96 triflex_timing = old_triflex_timing;
97
98 switch(speed)
99 {
100 case XFER_MW_DMA_2:
101 timing = 0x0103;break;
102 case XFER_MW_DMA_1:
103 timing = 0x0203;break;
104 case XFER_MW_DMA_0:
105 timing = 0x0808;break;
106 case XFER_SW_DMA_2:
107 case XFER_SW_DMA_1:
108 case XFER_SW_DMA_0:
109 timing = 0x0F0F;break;
110 case XFER_PIO_4:
111 timing = 0x0202;break;
112 case XFER_PIO_3:
113 timing = 0x0204;break;
114 case XFER_PIO_2:
115 timing = 0x0404;break;
116 case XFER_PIO_1:
117 timing = 0x0508;break;
118 case XFER_PIO_0:
119 timing = 0x0808;break;
120 default:
121 BUG();
122 }
123 triflex_timing &= ~ (0xFFFF << (16 * is_slave));
124 triflex_timing |= (timing << (16 * is_slave));
125
126 if (triflex_timing != old_triflex_timing)
127 pci_write_config_dword(pdev, channel_offset, triflex_timing);
128 }
129
130 /**
131 * triflex_set_piomode - set initial PIO mode data
132 * @ap: ATA interface
133 * @adev: ATA device
134 *
135 * Use the timing loader to set up the PIO mode. We have to do this
136 * because DMA start/stop will only be called once DMA occurs. If there
137 * has been no DMA then the PIO timings are still needed.
138 */
triflex_set_piomode(struct ata_port * ap,struct ata_device * adev)139 static void triflex_set_piomode(struct ata_port *ap, struct ata_device *adev)
140 {
141 triflex_load_timing(ap, adev, adev->pio_mode);
142 }
143
144 /**
145 * triflex_dma_start - DMA start callback
146 * @qc: Command in progress
147 *
148 * Usually drivers set the DMA timing at the point the set_dmamode call
149 * is made. Triflex however requires we load new timings on the
150 * transition or keep matching PIO/DMA pairs (ie MWDMA2/PIO4 etc).
151 * We load the DMA timings just before starting DMA and then restore
152 * the PIO timing when the DMA is finished.
153 */
154
triflex_bmdma_start(struct ata_queued_cmd * qc)155 static void triflex_bmdma_start(struct ata_queued_cmd *qc)
156 {
157 triflex_load_timing(qc->ap, qc->dev, qc->dev->dma_mode);
158 ata_bmdma_start(qc);
159 }
160
161 /**
162 * triflex_dma_stop - DMA stop callback
163 * @ap: ATA interface
164 * @adev: ATA device
165 *
166 * We loaded new timings in dma_start, as a result we need to restore
167 * the PIO timings in dma_stop so that the next command issue gets the
168 * right clock values.
169 */
170
triflex_bmdma_stop(struct ata_queued_cmd * qc)171 static void triflex_bmdma_stop(struct ata_queued_cmd *qc)
172 {
173 ata_bmdma_stop(qc);
174 triflex_load_timing(qc->ap, qc->dev, qc->dev->pio_mode);
175 }
176
177 static struct scsi_host_template triflex_sht = {
178 ATA_BMDMA_SHT(DRV_NAME),
179 };
180
181 static struct ata_port_operations triflex_port_ops = {
182 .inherits = &ata_bmdma_port_ops,
183 .bmdma_start = triflex_bmdma_start,
184 .bmdma_stop = triflex_bmdma_stop,
185 .cable_detect = ata_cable_40wire,
186 .set_piomode = triflex_set_piomode,
187 .prereset = triflex_prereset,
188 };
189
triflex_init_one(struct pci_dev * dev,const struct pci_device_id * id)190 static int triflex_init_one(struct pci_dev *dev, const struct pci_device_id *id)
191 {
192 static const struct ata_port_info info = {
193 .flags = ATA_FLAG_SLAVE_POSS,
194 .pio_mask = ATA_PIO4,
195 .mwdma_mask = ATA_MWDMA2,
196 .port_ops = &triflex_port_ops
197 };
198 const struct ata_port_info *ppi[] = { &info, NULL };
199 static int printed_version;
200
201 if (!printed_version++)
202 dev_printk(KERN_DEBUG, &dev->dev, "version " DRV_VERSION "\n");
203
204 return ata_pci_bmdma_init_one(dev, ppi, &triflex_sht, NULL, 0);
205 }
206
207 static const struct pci_device_id triflex[] = {
208 { PCI_VDEVICE(COMPAQ, PCI_DEVICE_ID_COMPAQ_TRIFLEX_IDE), },
209
210 { },
211 };
212
213 static struct pci_driver triflex_pci_driver = {
214 .name = DRV_NAME,
215 .id_table = triflex,
216 .probe = triflex_init_one,
217 .remove = ata_pci_remove_one,
218 #ifdef CONFIG_PM
219 .suspend = ata_pci_device_suspend,
220 .resume = ata_pci_device_resume,
221 #endif
222 };
223
triflex_init(void)224 static int __init triflex_init(void)
225 {
226 return pci_register_driver(&triflex_pci_driver);
227 }
228
triflex_exit(void)229 static void __exit triflex_exit(void)
230 {
231 pci_unregister_driver(&triflex_pci_driver);
232 }
233
234 MODULE_AUTHOR("Alan Cox");
235 MODULE_DESCRIPTION("low-level driver for Compaq Triflex");
236 MODULE_LICENSE("GPL");
237 MODULE_DEVICE_TABLE(pci, triflex);
238 MODULE_VERSION(DRV_VERSION);
239
240 module_init(triflex_init);
241 module_exit(triflex_exit);
242