1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * pata_triflex.c - Compaq PATA for new ATA layer
4 * (C) 2005 Red Hat Inc
5 * Alan Cox <alan@lxorguk.ukuu.org.uk>
6 *
7 * based upon
8 *
9 * triflex.c
10 *
11 * IDE Chipset driver for the Compaq TriFlex IDE controller.
12 *
13 * Known to work with the Compaq Workstation 5x00 series.
14 *
15 * Copyright (C) 2002 Hewlett-Packard Development Group, L.P.
16 * Author: Torben Mathiasen <torben.mathiasen@hp.com>
17 *
18 * Loosely based on the piix & svwks drivers.
19 *
20 * Documentation:
21 * Not publicly available.
22 */
23
24 #include <linux/kernel.h>
25 #include <linux/module.h>
26 #include <linux/pci.h>
27 #include <linux/blkdev.h>
28 #include <linux/delay.h>
29 #include <scsi/scsi_host.h>
30 #include <linux/libata.h>
31
32 #define DRV_NAME "pata_triflex"
33 #define DRV_VERSION "0.2.8"
34
35 /**
36 * triflex_prereset - probe begin
37 * @link: ATA link
38 * @deadline: deadline jiffies for the operation
39 *
40 * Set up cable type and use generic probe init
41 */
42
triflex_prereset(struct ata_link * link,unsigned long deadline)43 static int triflex_prereset(struct ata_link *link, unsigned long deadline)
44 {
45 static const struct pci_bits triflex_enable_bits[] = {
46 { 0x80, 1, 0x01, 0x01 },
47 { 0x80, 1, 0x02, 0x02 }
48 };
49
50 struct ata_port *ap = link->ap;
51 struct pci_dev *pdev = to_pci_dev(ap->host->dev);
52
53 if (!pci_test_config_bits(pdev, &triflex_enable_bits[ap->port_no]))
54 return -ENOENT;
55
56 return ata_sff_prereset(link, deadline);
57 }
58
59
60
61 /**
62 * triflex_load_timing - timing configuration
63 * @ap: ATA interface
64 * @adev: Device on the bus
65 * @speed: speed to configure
66 *
67 * The Triflex has one set of timings per device per channel. This
68 * means we must do some switching. As the PIO and DMA timings don't
69 * match we have to do some reloading unlike PIIX devices where tuning
70 * tricks can avoid it.
71 */
72
triflex_load_timing(struct ata_port * ap,struct ata_device * adev,int speed)73 static void triflex_load_timing(struct ata_port *ap, struct ata_device *adev, int speed)
74 {
75 struct pci_dev *pdev = to_pci_dev(ap->host->dev);
76 u32 timing = 0;
77 u32 triflex_timing, old_triflex_timing;
78 int channel_offset = ap->port_no ? 0x74: 0x70;
79 unsigned int is_slave = (adev->devno != 0);
80
81
82 pci_read_config_dword(pdev, channel_offset, &old_triflex_timing);
83 triflex_timing = old_triflex_timing;
84
85 switch(speed)
86 {
87 case XFER_MW_DMA_2:
88 timing = 0x0103;break;
89 case XFER_MW_DMA_1:
90 timing = 0x0203;break;
91 case XFER_MW_DMA_0:
92 timing = 0x0808;break;
93 case XFER_SW_DMA_2:
94 case XFER_SW_DMA_1:
95 case XFER_SW_DMA_0:
96 timing = 0x0F0F;break;
97 case XFER_PIO_4:
98 timing = 0x0202;break;
99 case XFER_PIO_3:
100 timing = 0x0204;break;
101 case XFER_PIO_2:
102 timing = 0x0404;break;
103 case XFER_PIO_1:
104 timing = 0x0508;break;
105 case XFER_PIO_0:
106 timing = 0x0808;break;
107 default:
108 BUG();
109 }
110 triflex_timing &= ~ (0xFFFF << (16 * is_slave));
111 triflex_timing |= (timing << (16 * is_slave));
112
113 if (triflex_timing != old_triflex_timing)
114 pci_write_config_dword(pdev, channel_offset, triflex_timing);
115 }
116
117 /**
118 * triflex_set_piomode - set initial PIO mode data
119 * @ap: ATA interface
120 * @adev: ATA device
121 *
122 * Use the timing loader to set up the PIO mode. We have to do this
123 * because DMA start/stop will only be called once DMA occurs. If there
124 * has been no DMA then the PIO timings are still needed.
125 */
triflex_set_piomode(struct ata_port * ap,struct ata_device * adev)126 static void triflex_set_piomode(struct ata_port *ap, struct ata_device *adev)
127 {
128 triflex_load_timing(ap, adev, adev->pio_mode);
129 }
130
131 /**
132 * triflex_bmdma_start - DMA start callback
133 * @qc: Command in progress
134 *
135 * Usually drivers set the DMA timing at the point the set_dmamode call
136 * is made. Triflex however requires we load new timings on the
137 * transition or keep matching PIO/DMA pairs (ie MWDMA2/PIO4 etc).
138 * We load the DMA timings just before starting DMA and then restore
139 * the PIO timing when the DMA is finished.
140 */
141
triflex_bmdma_start(struct ata_queued_cmd * qc)142 static void triflex_bmdma_start(struct ata_queued_cmd *qc)
143 {
144 triflex_load_timing(qc->ap, qc->dev, qc->dev->dma_mode);
145 ata_bmdma_start(qc);
146 }
147
148 /**
149 * triflex_bmdma_stop - DMA stop callback
150 * @qc: ATA command
151 *
152 * We loaded new timings in dma_start, as a result we need to restore
153 * the PIO timings in dma_stop so that the next command issue gets the
154 * right clock values.
155 */
156
triflex_bmdma_stop(struct ata_queued_cmd * qc)157 static void triflex_bmdma_stop(struct ata_queued_cmd *qc)
158 {
159 ata_bmdma_stop(qc);
160 triflex_load_timing(qc->ap, qc->dev, qc->dev->pio_mode);
161 }
162
163 static const struct scsi_host_template triflex_sht = {
164 ATA_BMDMA_SHT(DRV_NAME),
165 };
166
167 static struct ata_port_operations triflex_port_ops = {
168 .inherits = &ata_bmdma_port_ops,
169 .bmdma_start = triflex_bmdma_start,
170 .bmdma_stop = triflex_bmdma_stop,
171 .cable_detect = ata_cable_40wire,
172 .set_piomode = triflex_set_piomode,
173 .prereset = triflex_prereset,
174 };
175
triflex_init_one(struct pci_dev * dev,const struct pci_device_id * id)176 static int triflex_init_one(struct pci_dev *dev, const struct pci_device_id *id)
177 {
178 static const struct ata_port_info info = {
179 .flags = ATA_FLAG_SLAVE_POSS,
180 .pio_mask = ATA_PIO4,
181 .mwdma_mask = ATA_MWDMA2,
182 .port_ops = &triflex_port_ops
183 };
184 const struct ata_port_info *ppi[] = { &info, NULL };
185
186 ata_print_version_once(&dev->dev, DRV_VERSION);
187
188 return ata_pci_bmdma_init_one(dev, ppi, &triflex_sht, NULL, 0);
189 }
190
191 static const struct pci_device_id triflex[] = {
192 { PCI_VDEVICE(COMPAQ, PCI_DEVICE_ID_COMPAQ_TRIFLEX_IDE), },
193
194 { },
195 };
196
197 #ifdef CONFIG_PM_SLEEP
triflex_ata_pci_device_suspend(struct pci_dev * pdev,pm_message_t mesg)198 static int triflex_ata_pci_device_suspend(struct pci_dev *pdev, pm_message_t mesg)
199 {
200 struct ata_host *host = pci_get_drvdata(pdev);
201
202 ata_host_suspend(host, mesg);
203
204 /*
205 * We must not disable or powerdown the device.
206 * APM bios refuses to suspend if IDE is not accessible.
207 */
208 pci_save_state(pdev);
209
210 return 0;
211 }
212
213 #endif
214
215 static struct pci_driver triflex_pci_driver = {
216 .name = DRV_NAME,
217 .id_table = triflex,
218 .probe = triflex_init_one,
219 .remove = ata_pci_remove_one,
220 #ifdef CONFIG_PM_SLEEP
221 .suspend = triflex_ata_pci_device_suspend,
222 .resume = ata_pci_device_resume,
223 #endif
224 };
225
226 module_pci_driver(triflex_pci_driver);
227
228 MODULE_AUTHOR("Alan Cox");
229 MODULE_DESCRIPTION("low-level driver for Compaq Triflex");
230 MODULE_LICENSE("GPL");
231 MODULE_DEVICE_TABLE(pci, triflex);
232 MODULE_VERSION(DRV_VERSION);
233