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
30 static int reg_base;
31
32 static 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 */
write_reg(u8 value,int reg)39 static 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 */
read_reg(int reg)53 static 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
opti621_set_pio_mode(ide_hwif_t * hwif,ide_drive_t * drive)66 static 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
131 static const struct ide_port_ops opti621_port_ops = {
132 .set_pio_mode = opti621_set_pio_mode,
133 };
134
135 static 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
opti621_init_one(struct pci_dev * dev,const struct pci_device_id * id)143 static 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
148 static 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 };
153 MODULE_DEVICE_TABLE(pci, opti621_pci_tbl);
154
155 static 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
opti621_ide_init(void)164 static int __init opti621_ide_init(void)
165 {
166 return ide_pci_register_driver(&opti621_pci_driver);
167 }
168
opti621_ide_exit(void)169 static void __exit opti621_ide_exit(void)
170 {
171 pci_unregister_driver(&opti621_pci_driver);
172 }
173
174 module_init(opti621_ide_init);
175 module_exit(opti621_ide_exit);
176
177 MODULE_AUTHOR("Jaromir Koutek, Jan Harkes, Mark Lord");
178 MODULE_DESCRIPTION("PCI driver module for Opti621 IDE");
179 MODULE_LICENSE("GPL");
180