xref: /kernel/linux/linux-5.10/drivers/ide/triflex.c (revision 8c2ecf20) 
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * IDE Chipset driver for the Compaq TriFlex IDE controller.
4 *
5 * Known to work with the Compaq Workstation 5x00 series.
6 *
7 * Copyright (C) 2002 Hewlett-Packard Development Group, L.P.
8 * Author: Torben Mathiasen <torben.mathiasen@hp.com>
9 *
10 * Loosely based on the piix & svwks drivers.
11 *
12 * Documentation:
13 *	Not publicly available.
14 */
15
16#include <linux/types.h>
17#include <linux/module.h>
18#include <linux/kernel.h>
19#include <linux/pci.h>
20#include <linux/ide.h>
21#include <linux/init.h>
22
23#define DRV_NAME "triflex"
24
25static void triflex_set_mode(ide_hwif_t *hwif, ide_drive_t *drive)
26{
27	struct pci_dev *dev = to_pci_dev(hwif->dev);
28	u32 triflex_timings = 0;
29	u16 timing = 0;
30	u8 channel_offset = hwif->channel ? 0x74 : 0x70, unit = drive->dn & 1;
31
32	pci_read_config_dword(dev, channel_offset, &triflex_timings);
33
34	switch (drive->dma_mode) {
35		case XFER_MW_DMA_2:
36			timing = 0x0103;
37			break;
38		case XFER_MW_DMA_1:
39			timing = 0x0203;
40			break;
41		case XFER_MW_DMA_0:
42			timing = 0x0808;
43			break;
44		case XFER_SW_DMA_2:
45		case XFER_SW_DMA_1:
46		case XFER_SW_DMA_0:
47			timing = 0x0f0f;
48			break;
49		case XFER_PIO_4:
50			timing = 0x0202;
51			break;
52		case XFER_PIO_3:
53			timing = 0x0204;
54			break;
55		case XFER_PIO_2:
56			timing = 0x0404;
57			break;
58		case XFER_PIO_1:
59			timing = 0x0508;
60			break;
61		case XFER_PIO_0:
62			timing = 0x0808;
63			break;
64	}
65
66	triflex_timings &= ~(0xFFFF << (16 * unit));
67	triflex_timings |= (timing << (16 * unit));
68
69	pci_write_config_dword(dev, channel_offset, triflex_timings);
70}
71
72static void triflex_set_pio_mode(ide_hwif_t *hwif, ide_drive_t *drive)
73{
74	drive->dma_mode = drive->pio_mode;
75	triflex_set_mode(hwif, drive);
76}
77
78static const struct ide_port_ops triflex_port_ops = {
79	.set_pio_mode		= triflex_set_pio_mode,
80	.set_dma_mode		= triflex_set_mode,
81};
82
83static const struct ide_port_info triflex_device = {
84	.name		= DRV_NAME,
85	.enablebits	= {{0x80, 0x01, 0x01}, {0x80, 0x02, 0x02}},
86	.port_ops	= &triflex_port_ops,
87	.pio_mask	= ATA_PIO4,
88	.swdma_mask	= ATA_SWDMA2,
89	.mwdma_mask	= ATA_MWDMA2,
90};
91
92static int triflex_init_one(struct pci_dev *dev, const struct pci_device_id *id)
93{
94	return ide_pci_init_one(dev, &triflex_device, NULL);
95}
96
97static const struct pci_device_id triflex_pci_tbl[] = {
98	{ PCI_VDEVICE(COMPAQ, PCI_DEVICE_ID_COMPAQ_TRIFLEX_IDE), 0 },
99	{ 0, },
100};
101MODULE_DEVICE_TABLE(pci, triflex_pci_tbl);
102
103#ifdef CONFIG_PM
104static int triflex_ide_pci_suspend(struct pci_dev *dev, pm_message_t state)
105{
106	/*
107	 * We must not disable or powerdown the device.
108	 * APM bios refuses to suspend if IDE is not accessible.
109	 */
110	pci_save_state(dev);
111	return 0;
112}
113#else
114#define triflex_ide_pci_suspend NULL
115#endif
116
117static struct pci_driver triflex_pci_driver = {
118	.name		= "TRIFLEX_IDE",
119	.id_table	= triflex_pci_tbl,
120	.probe		= triflex_init_one,
121	.remove		= ide_pci_remove,
122	.suspend	= triflex_ide_pci_suspend,
123	.resume		= ide_pci_resume,
124};
125
126static int __init triflex_ide_init(void)
127{
128	return ide_pci_register_driver(&triflex_pci_driver);
129}
130
131static void __exit triflex_ide_exit(void)
132{
133	pci_unregister_driver(&triflex_pci_driver);
134}
135
136module_init(triflex_ide_init);
137module_exit(triflex_ide_exit);
138
139MODULE_AUTHOR("Torben Mathiasen");
140MODULE_DESCRIPTION("PCI driver module for Compaq Triflex IDE");
141MODULE_LICENSE("GPL");
142
143
144