Linux Kernel  3.7.1
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
opti621.c
Go to the documentation of this file.
1 /*
2  * Copyright (C) 1996-1998 Linus Torvalds & authors (see below)
3  */
4 
5 /*
6  * Authors:
7  * Jaromir Koutek <[email protected]>,
8  * Jan Harkes <[email protected]>,
9  * Mark Lord <[email protected]>
10  * Some parts of code are from ali14xx.c and from rz1000.c.
11  */
12 
13 #include <linux/types.h>
14 #include <linux/module.h>
15 #include <linux/kernel.h>
16 #include <linux/pci.h>
17 #include <linux/ide.h>
18 
19 #include <asm/io.h>
20 
21 #define DRV_NAME "opti621"
22 
23 #define READ_REG 0 /* index of Read cycle timing register */
24 #define WRITE_REG 1 /* index of Write cycle timing register */
25 #define CNTRL_REG 3 /* index of Control register */
26 #define STRAP_REG 5 /* index of Strap register */
27 #define MISC_REG 6 /* index of Miscellaneous register */
28 
29 static int reg_base;
30 
31 static DEFINE_SPINLOCK(opti621_lock);
32 
33 /* Write value to register reg, base of register
34  * is at reg_base (0x1f0 primary, 0x170 secondary,
35  * if not changed by PCI configuration).
36  * This is from setupvic.exe program.
37  */
38 static void write_reg(u8 value, int reg)
39 {
40  inw(reg_base + 1);
41  inw(reg_base + 1);
42  outb(3, reg_base + 2);
43  outb(value, reg_base + reg);
44  outb(0x83, reg_base + 2);
45 }
46 
47 /* Read value from register reg, base of register
48  * is at reg_base (0x1f0 primary, 0x170 secondary,
49  * if not changed by PCI configuration).
50  * This is from setupvic.exe program.
51  */
52 static u8 read_reg(int reg)
53 {
54  u8 ret = 0;
55 
56  inw(reg_base + 1);
57  inw(reg_base + 1);
58  outb(3, reg_base + 2);
59  ret = inb(reg_base + reg);
60  outb(0x83, reg_base + 2);
61 
62  return ret;
63 }
64 
65 static void opti621_set_pio_mode(ide_hwif_t *hwif, ide_drive_t *drive)
66 {
67  ide_drive_t *pair = ide_get_pair_dev(drive);
68  unsigned long flags;
69  unsigned long mode = drive->pio_mode, pair_mode;
70  const u8 pio = mode - XFER_PIO_0;
71  u8 tim, misc, addr_pio = pio, clk;
72 
73  /* DRDY is default 2 (by OPTi Databook) */
74  static const u8 addr_timings[2][5] = {
75  { 0x20, 0x10, 0x00, 0x00, 0x00 }, /* 33 MHz */
76  { 0x10, 0x10, 0x00, 0x00, 0x00 }, /* 25 MHz */
77  };
78  static const u8 data_rec_timings[2][5] = {
79  { 0x5b, 0x45, 0x32, 0x21, 0x20 }, /* 33 MHz */
80  { 0x48, 0x34, 0x21, 0x10, 0x10 } /* 25 MHz */
81  };
82 
83  ide_set_drivedata(drive, (void *)mode);
84 
85  if (pair) {
86  pair_mode = (unsigned long)ide_get_drivedata(pair);
87  if (pair_mode && pair_mode < mode)
88  addr_pio = pair_mode - XFER_PIO_0;
89  }
90 
91  spin_lock_irqsave(&opti621_lock, flags);
92 
93  reg_base = hwif->io_ports.data_addr;
94 
95  /* allow Register-B */
96  outb(0xc0, reg_base + CNTRL_REG);
97  /* hmm, setupvic.exe does this ;-) */
98  outb(0xff, reg_base + 5);
99  /* if reads 0xff, adapter not exist? */
100  (void)inb(reg_base + CNTRL_REG);
101  /* if reads 0xc0, no interface exist? */
103 
104  /* check CLK speed */
105  clk = read_reg(STRAP_REG) & 1;
106 
107  printk(KERN_INFO "%s: CLK = %d MHz\n", hwif->name, clk ? 25 : 33);
108 
109  tim = data_rec_timings[clk][pio];
110  misc = addr_timings[clk][addr_pio];
111 
112  /* select Index-0/1 for Register-A/B */
113  write_reg(drive->dn & 1, MISC_REG);
114  /* set read cycle timings */
115  write_reg(tim, READ_REG);
116  /* set write cycle timings */
117  write_reg(tim, WRITE_REG);
118 
119  /* use Register-A for drive 0 */
120  /* use Register-B for drive 1 */
121  write_reg(0x85, CNTRL_REG);
122 
123  /* set address setup, DRDY timings, */
124  /* and read prefetch for both drives */
125  write_reg(misc, MISC_REG);
126 
127  spin_unlock_irqrestore(&opti621_lock, flags);
128 }
129 
130 static const struct ide_port_ops opti621_port_ops = {
131  .set_pio_mode = opti621_set_pio_mode,
132 };
133 
134 static const struct ide_port_info opti621_chipset __devinitconst = {
135  .name = DRV_NAME,
136  .enablebits = { {0x45, 0x80, 0x00}, {0x40, 0x08, 0x00} },
137  .port_ops = &opti621_port_ops,
138  .host_flags = IDE_HFLAG_NO_DMA,
139  .pio_mask = ATA_PIO4,
140 };
141 
142 static int __devinit opti621_init_one(struct pci_dev *dev, const struct pci_device_id *id)
143 {
144  return ide_pci_init_one(dev, &opti621_chipset, NULL);
145 }
146 
147 static const struct pci_device_id opti621_pci_tbl[] = {
150  { 0, },
151 };
152 MODULE_DEVICE_TABLE(pci, opti621_pci_tbl);
153 
154 static struct pci_driver opti621_pci_driver = {
155  .name = "Opti621_IDE",
156  .id_table = opti621_pci_tbl,
157  .probe = opti621_init_one,
158  .remove = ide_pci_remove,
159  .suspend = ide_pci_suspend,
160  .resume = ide_pci_resume,
161 };
162 
163 static int __init opti621_ide_init(void)
164 {
165  return ide_pci_register_driver(&opti621_pci_driver);
166 }
167 
168 static void __exit opti621_ide_exit(void)
169 {
170  pci_unregister_driver(&opti621_pci_driver);
171 }
172 
173 module_init(opti621_ide_init);
174 module_exit(opti621_ide_exit);
175 
176 MODULE_AUTHOR("Jaromir Koutek, Jan Harkes, Mark Lord");
177 MODULE_DESCRIPTION("PCI driver module for Opti621 IDE");
178 MODULE_LICENSE("GPL");