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umc8672.c
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1 /*
2  * Copyright (C) 1995-1996 Linus Torvalds & author (see below)
3  */
4 
5 /*
6  * Principal Author/Maintainer: [email protected] (Wolfram Podien)
7  *
8  * This file provides support for the advanced features
9  * of the UMC 8672 IDE interface.
10  *
11  * Version 0.01 Initial version, hacked out of ide.c,
12  * and #include'd rather than compiled separately.
13  * This will get cleaned up in a subsequent release.
14  *
15  * Version 0.02 now configs/compiles separate from ide.c -ml
16  * Version 0.03 enhanced auto-tune, fix display bug
17  * Version 0.05 replace sti() with restore_flags() -ml
18  * add detection of possible race condition -ml
19  */
20 
21 /*
22  * VLB Controller Support from
23  * Wolfram Podien
24  * Rohoefe 3
25  * D28832 Achim
26  * Germany
27  *
28  * To enable UMC8672 support there must a lilo line like
29  * append="ide0=umc8672"...
30  * To set the speed according to the abilities of the hardware there must be a
31  * line like
32  * #define UMC_DRIVE0 11
33  * in the beginning of the driver, which sets the speed of drive 0 to 11 (there
34  * are some lines present). 0 - 11 are allowed speed values. These values are
35  * the results from the DOS speed test program supplied from UMC. 11 is the
36  * highest speed (about PIO mode 3)
37  */
38 #define REALLY_SLOW_IO /* some systems can safely undef this */
39 
40 #include <linux/module.h>
41 #include <linux/types.h>
42 #include <linux/kernel.h>
43 #include <linux/delay.h>
44 #include <linux/timer.h>
45 #include <linux/mm.h>
46 #include <linux/ioport.h>
47 #include <linux/blkdev.h>
48 #include <linux/ide.h>
49 #include <linux/init.h>
50 
51 #include <asm/io.h>
52 
53 #define DRV_NAME "umc8672"
54 
55 /*
56  * Default speeds. These can be changed with "auto-tune" and/or hdparm.
57  */
58 #define UMC_DRIVE0 1 /* DOS measured drive speeds */
59 #define UMC_DRIVE1 1 /* 0 to 11 allowed */
60 #define UMC_DRIVE2 1 /* 11 = Fastest Speed */
61 #define UMC_DRIVE3 1 /* In case of crash reduce speed */
62 
63 static u8 current_speeds[4] = {UMC_DRIVE0, UMC_DRIVE1, UMC_DRIVE2, UMC_DRIVE3};
64 static const u8 pio_to_umc [5] = {0, 3, 7, 10, 11}; /* rough guesses */
65 
66 /* 0 1 2 3 4 5 6 7 8 9 10 11 */
67 static const u8 speedtab [3][12] = {
68  {0x0f, 0x0b, 0x02, 0x02, 0x02, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x1},
69  {0x03, 0x02, 0x02, 0x02, 0x02, 0x02, 0x01, 0x01, 0x01, 0x01, 0x01, 0x1},
70  {0xff, 0xcb, 0xc0, 0x58, 0x36, 0x33, 0x23, 0x22, 0x21, 0x11, 0x10, 0x0}
71 };
72 
73 static void out_umc(char port, char wert)
74 {
75  outb_p(port, 0x108);
76  outb_p(wert, 0x109);
77 }
78 
79 static inline u8 in_umc(char port)
80 {
81  outb_p(port, 0x108);
82  return inb_p(0x109);
83 }
84 
85 static void umc_set_speeds(u8 speeds[])
86 {
87  int i, tmp;
88 
89  outb_p(0x5A, 0x108); /* enable umc */
90 
91  out_umc(0xd7, (speedtab[0][speeds[2]] | (speedtab[0][speeds[3]]<<4)));
92  out_umc(0xd6, (speedtab[0][speeds[0]] | (speedtab[0][speeds[1]]<<4)));
93  tmp = 0;
94  for (i = 3; i >= 0; i--)
95  tmp = (tmp << 2) | speedtab[1][speeds[i]];
96  out_umc(0xdc, tmp);
97  for (i = 0; i < 4; i++) {
98  out_umc(0xd0 + i, speedtab[2][speeds[i]]);
99  out_umc(0xd8 + i, speedtab[2][speeds[i]]);
100  }
101  outb_p(0xa5, 0x108); /* disable umc */
102 
103  printk("umc8672: drive speeds [0 to 11]: %d %d %d %d\n",
104  speeds[0], speeds[1], speeds[2], speeds[3]);
105 }
106 
107 static void umc_set_pio_mode(ide_hwif_t *hwif, ide_drive_t *drive)
108 {
109  ide_hwif_t *mate = hwif->mate;
110  unsigned long uninitialized_var(flags);
111  const u8 pio = drive->pio_mode - XFER_PIO_0;
112 
113  printk("%s: setting umc8672 to PIO mode%d (speed %d)\n",
114  drive->name, pio, pio_to_umc[pio]);
115  if (mate)
116  spin_lock_irqsave(&mate->lock, flags);
117  if (mate && mate->handler) {
118  printk(KERN_ERR "umc8672: other interface is busy: exiting tune_umc()\n");
119  } else {
120  current_speeds[drive->name[2] - 'a'] = pio_to_umc[pio];
121  umc_set_speeds(current_speeds);
122  }
123  if (mate)
124  spin_unlock_irqrestore(&mate->lock, flags);
125 }
126 
127 static const struct ide_port_ops umc8672_port_ops = {
128  .set_pio_mode = umc_set_pio_mode,
129 };
130 
131 static const struct ide_port_info umc8672_port_info __initconst = {
132  .name = DRV_NAME,
133  .chipset = ide_umc8672,
134  .port_ops = &umc8672_port_ops,
135  .host_flags = IDE_HFLAG_NO_DMA,
136  .pio_mask = ATA_PIO4,
137 };
138 
139 static int __init umc8672_probe(void)
140 {
141  unsigned long flags;
142 
143  if (!request_region(0x108, 2, "umc8672")) {
144  printk(KERN_ERR "umc8672: ports 0x108-0x109 already in use.\n");
145  return 1;
146  }
147  local_irq_save(flags);
148  outb_p(0x5A, 0x108); /* enable umc */
149  if (in_umc (0xd5) != 0xa0) {
150  local_irq_restore(flags);
151  printk(KERN_ERR "umc8672: not found\n");
152  release_region(0x108, 2);
153  return 1;
154  }
155  outb_p(0xa5, 0x108); /* disable umc */
156 
157  umc_set_speeds(current_speeds);
158  local_irq_restore(flags);
159 
160  return ide_legacy_device_add(&umc8672_port_info, 0);
161 }
162 
163 static bool probe_umc8672;
164 
165 module_param_named(probe, probe_umc8672, bool, 0);
166 MODULE_PARM_DESC(probe, "probe for UMC8672 chipset");
167 
168 static int __init umc8672_init(void)
169 {
170  if (probe_umc8672 == 0)
171  goto out;
172 
173  if (umc8672_probe() == 0)
174  return 0;
175 out:
176  return -ENODEV;
177 }
178 
179 module_init(umc8672_init);
180 
181 MODULE_AUTHOR("Wolfram Podien");
182 MODULE_DESCRIPTION("Support for UMC 8672 IDE chipset");
183 MODULE_LICENSE("GPL");