1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 *  Copyright (C) 1996-1998  Linus Torvalds & authors (see below)
  4 */
  5
  6/*
  7 * Authors:
  8 * Jaromir Koutek <miri@punknet.cz>,
  9 * Jan Harkes <jaharkes@cwi.nl>,
 10 * Mark Lord <mlord@pobox.com>
 11 * Some parts of code are from ali14xx.c and from rz1000.c.
 12 */
 13
 14#include <linux/types.h>
 15#include <linux/module.h>
 16#include <linux/kernel.h>
 17#include <linux/pci.h>
 18#include <linux/ide.h>
 19
 20#include <asm/io.h>
 21
 22#define DRV_NAME "opti621"
 23
 24#define READ_REG 0	/* index of Read cycle timing register */
 25#define WRITE_REG 1	/* index of Write cycle timing register */
 26#define CNTRL_REG 3	/* index of Control register */
 27#define STRAP_REG 5	/* index of Strap register */
 28#define MISC_REG 6	/* index of Miscellaneous register */
 29
 30static int reg_base;
 31
 32static DEFINE_SPINLOCK(opti621_lock);
 33
 34/* Write value to register reg, base of register
 35 * is at reg_base (0x1f0 primary, 0x170 secondary,
 36 * if not changed by PCI configuration).
 37 * This is from setupvic.exe program.
 38 */
 39static void write_reg(u8 value, int reg)
 40{
 41	inw(reg_base + 1);
 42	inw(reg_base + 1);
 43	outb(3, reg_base + 2);
 44	outb(value, reg_base + reg);
 45	outb(0x83, reg_base + 2);
 46}
 47
 48/* Read value from register reg, base of register
 49 * is at reg_base (0x1f0 primary, 0x170 secondary,
 50 * if not changed by PCI configuration).
 51 * This is from setupvic.exe program.
 52 */
 53static u8 read_reg(int reg)
 54{
 55	u8 ret = 0;
 56
 57	inw(reg_base + 1);
 58	inw(reg_base + 1);
 59	outb(3, reg_base + 2);
 60	ret = inb(reg_base + reg);
 61	outb(0x83, reg_base + 2);
 62
 63	return ret;
 64}
 65
 66static void opti621_set_pio_mode(ide_hwif_t *hwif, ide_drive_t *drive)
 67{
 68	ide_drive_t *pair = ide_get_pair_dev(drive);
 69	unsigned long flags;
 70	unsigned long mode = drive->pio_mode, pair_mode;
 71	const u8 pio = mode - XFER_PIO_0;
 72	u8 tim, misc, addr_pio = pio, clk;
 73
 74	/* DRDY is default 2 (by OPTi Databook) */
 75	static const u8 addr_timings[2][5] = {
 76		{ 0x20, 0x10, 0x00, 0x00, 0x00 },	/* 33 MHz */
 77		{ 0x10, 0x10, 0x00, 0x00, 0x00 },	/* 25 MHz */
 78	};
 79	static const u8 data_rec_timings[2][5] = {
 80		{ 0x5b, 0x45, 0x32, 0x21, 0x20 },	/* 33 MHz */
 81		{ 0x48, 0x34, 0x21, 0x10, 0x10 }	/* 25 MHz */
 82	};
 83
 84	ide_set_drivedata(drive, (void *)mode);
 85
 86	if (pair) {
 87		pair_mode = (unsigned long)ide_get_drivedata(pair);
 88		if (pair_mode && pair_mode < mode)
 89			addr_pio = pair_mode - XFER_PIO_0;
 90	}
 91
 92	spin_lock_irqsave(&opti621_lock, flags);
 93
 94	reg_base = hwif->io_ports.data_addr;
 95
 96	/* allow Register-B */
 97	outb(0xc0, reg_base + CNTRL_REG);
 98	/* hmm, setupvic.exe does this ;-) */
 99	outb(0xff, reg_base + 5);
100	/* if reads 0xff, adapter not exist? */
101	(void)inb(reg_base + CNTRL_REG);
102	/* if reads 0xc0, no interface exist? */
103	read_reg(CNTRL_REG);
104
105	/* check CLK speed */
106	clk = read_reg(STRAP_REG) & 1;
107
108	printk(KERN_INFO "%s: CLK = %d MHz\n", hwif->name, clk ? 25 : 33);
109
110	tim  = data_rec_timings[clk][pio];
111	misc = addr_timings[clk][addr_pio];
112
113	/* select Index-0/1 for Register-A/B */
114	write_reg(drive->dn & 1, MISC_REG);
115	/* set read cycle timings */
116	write_reg(tim, READ_REG);
117	/* set write cycle timings */
118	write_reg(tim, WRITE_REG);
119
120	/* use Register-A for drive 0 */
121	/* use Register-B for drive 1 */
122	write_reg(0x85, CNTRL_REG);
123
124	/* set address setup, DRDY timings,   */
125	/*  and read prefetch for both drives */
126	write_reg(misc, MISC_REG);
127
128	spin_unlock_irqrestore(&opti621_lock, flags);
129}
130
131static const struct ide_port_ops opti621_port_ops = {
132	.set_pio_mode		= opti621_set_pio_mode,
133};
134
135static const struct ide_port_info opti621_chipset = {
136	.name		= DRV_NAME,
137	.enablebits	= { {0x45, 0x80, 0x00}, {0x40, 0x08, 0x00} },
138	.port_ops	= &opti621_port_ops,
139	.host_flags	= IDE_HFLAG_NO_DMA,
140	.pio_mask	= ATA_PIO4,
141};
142
143static int opti621_init_one(struct pci_dev *dev, const struct pci_device_id *id)
144{
145	return ide_pci_init_one(dev, &opti621_chipset, NULL);
146}
147
148static const struct pci_device_id opti621_pci_tbl[] = {
149	{ PCI_VDEVICE(OPTI, PCI_DEVICE_ID_OPTI_82C621), 0 },
150	{ PCI_VDEVICE(OPTI, PCI_DEVICE_ID_OPTI_82C825), 0 },
151	{ 0, },
152};
153MODULE_DEVICE_TABLE(pci, opti621_pci_tbl);
154
155static struct pci_driver opti621_pci_driver = {
156	.name		= "Opti621_IDE",
157	.id_table	= opti621_pci_tbl,
158	.probe		= opti621_init_one,
159	.remove		= ide_pci_remove,
160	.suspend	= ide_pci_suspend,
161	.resume		= ide_pci_resume,
162};
163
164static int __init opti621_ide_init(void)
165{
166	return ide_pci_register_driver(&opti621_pci_driver);
167}
168
169static void __exit opti621_ide_exit(void)
170{
171	pci_unregister_driver(&opti621_pci_driver);
172}
173
174module_init(opti621_ide_init);
175module_exit(opti621_ide_exit);
176
177MODULE_AUTHOR("Jaromir Koutek, Jan Harkes, Mark Lord");
178MODULE_DESCRIPTION("PCI driver module for Opti621 IDE");
179MODULE_LICENSE("GPL");