Root/drivers/ata/pata_triflex.c

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
56static 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
86static 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 */
139static 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
155static 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
171static 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
177static struct scsi_host_template triflex_sht = {
178    ATA_BMDMA_SHT(DRV_NAME),
179};
180
181static 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
190static 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
200    ata_print_version_once(&dev->dev, DRV_VERSION);
201
202    return ata_pci_bmdma_init_one(dev, ppi, &triflex_sht, NULL, 0);
203}
204
205static const struct pci_device_id triflex[] = {
206    { PCI_VDEVICE(COMPAQ, PCI_DEVICE_ID_COMPAQ_TRIFLEX_IDE), },
207
208    { },
209};
210
211#ifdef CONFIG_PM
212static int triflex_ata_pci_device_suspend(struct pci_dev *pdev, pm_message_t mesg)
213{
214    struct ata_host *host = dev_get_drvdata(&pdev->dev);
215    int rc = 0;
216
217    rc = ata_host_suspend(host, mesg);
218    if (rc)
219        return rc;
220
221    /*
222     * We must not disable or powerdown the device.
223     * APM bios refuses to suspend if IDE is not accessible.
224     */
225    pci_save_state(pdev);
226
227    return 0;
228}
229
230#endif
231
232static struct pci_driver triflex_pci_driver = {
233    .name = DRV_NAME,
234    .id_table = triflex,
235    .probe = triflex_init_one,
236    .remove = ata_pci_remove_one,
237#ifdef CONFIG_PM
238    .suspend = triflex_ata_pci_device_suspend,
239    .resume = ata_pci_device_resume,
240#endif
241};
242
243module_pci_driver(triflex_pci_driver);
244
245MODULE_AUTHOR("Alan Cox");
246MODULE_DESCRIPTION("low-level driver for Compaq Triflex");
247MODULE_LICENSE("GPL");
248MODULE_DEVICE_TABLE(pci, triflex);
249MODULE_VERSION(DRV_VERSION);
250

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