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
43static 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
73static 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 */
126static 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
142static 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
157static 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
163static const struct scsi_host_template triflex_sht = {
164	ATA_BMDMA_SHT(DRV_NAME),
165};
166
167static 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
176static 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
191static 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
198static 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
215static 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
226module_pci_driver(triflex_pci_driver);
227
228MODULE_AUTHOR("Alan Cox");
229MODULE_DESCRIPTION("low-level driver for Compaq Triflex");
230MODULE_LICENSE("GPL");
231MODULE_DEVICE_TABLE(pci, triflex);
232MODULE_VERSION(DRV_VERSION);
233