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