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smsc_fdc37m81x.c
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1 /*
2  * Interface for smsc fdc48m81x Super IO chip
3  *
4  * Author: MontaVista Software, Inc. [email protected]
5  *
6  * 2001-2003 (c) MontaVista Software, Inc. This file is licensed under
7  * the terms of the GNU General Public License version 2. This program
8  * is licensed "as is" without any warranty of any kind, whether express
9  * or implied.
10  *
11  * Copyright 2004 (c) MontaVista Software, Inc.
12  */
13 #include <linux/init.h>
14 #include <linux/types.h>
15 #include <asm/io.h>
17 
18 /* Common Registers */
19 #define SMSC_FDC37M81X_CONFIG_INDEX 0x00
20 #define SMSC_FDC37M81X_CONFIG_DATA 0x01
21 #define SMSC_FDC37M81X_CONF 0x02
22 #define SMSC_FDC37M81X_INDEX 0x03
23 #define SMSC_FDC37M81X_DNUM 0x07
24 #define SMSC_FDC37M81X_DID 0x20
25 #define SMSC_FDC37M81X_DREV 0x21
26 #define SMSC_FDC37M81X_PCNT 0x22
27 #define SMSC_FDC37M81X_PMGT 0x23
28 #define SMSC_FDC37M81X_OSC 0x24
29 #define SMSC_FDC37M81X_CONFPA0 0x26
30 #define SMSC_FDC37M81X_CONFPA1 0x27
31 #define SMSC_FDC37M81X_TEST4 0x2B
32 #define SMSC_FDC37M81X_TEST5 0x2C
33 #define SMSC_FDC37M81X_TEST1 0x2D
34 #define SMSC_FDC37M81X_TEST2 0x2E
35 #define SMSC_FDC37M81X_TEST3 0x2F
36 
37 /* Logical device numbers */
38 #define SMSC_FDC37M81X_FDD 0x00
39 #define SMSC_FDC37M81X_SERIAL1 0x04
40 #define SMSC_FDC37M81X_SERIAL2 0x05
41 #define SMSC_FDC37M81X_KBD 0x07
42 
43 /* Logical device Config Registers */
44 #define SMSC_FDC37M81X_ACTIVE 0x30
45 #define SMSC_FDC37M81X_BASEADDR0 0x60
46 #define SMSC_FDC37M81X_BASEADDR1 0x61
47 #define SMSC_FDC37M81X_INT 0x70
48 #define SMSC_FDC37M81X_INT2 0x72
49 #define SMSC_FDC37M81X_MODE 0xF0
50 
51 /* Chip Config Values */
52 #define SMSC_FDC37M81X_CONFIG_ENTER 0x55
53 #define SMSC_FDC37M81X_CONFIG_EXIT 0xaa
54 #define SMSC_FDC37M81X_CHIP_ID 0x4d
55 
56 static unsigned long g_smsc_fdc37m81x_base;
57 
58 static inline unsigned char smsc_fdc37m81x_rd(unsigned char index)
59 {
60  outb(index, g_smsc_fdc37m81x_base + SMSC_FDC37M81X_CONFIG_INDEX);
61 
62  return inb(g_smsc_fdc37m81x_base + SMSC_FDC37M81X_CONFIG_DATA);
63 }
64 
65 static inline void smsc_dc37m81x_wr(unsigned char index, unsigned char data)
66 {
67  outb(index, g_smsc_fdc37m81x_base + SMSC_FDC37M81X_CONFIG_INDEX);
68  outb(data, g_smsc_fdc37m81x_base + SMSC_FDC37M81X_CONFIG_DATA);
69 }
70 
72 {
73  if (g_smsc_fdc37m81x_base) {
75  g_smsc_fdc37m81x_base + SMSC_FDC37M81X_CONFIG_INDEX);
76  }
77 }
78 
80 {
81  if (g_smsc_fdc37m81x_base)
83  g_smsc_fdc37m81x_base + SMSC_FDC37M81X_CONFIG_INDEX);
84 }
85 
87 {
88  u8 val = 0;
89 
90  if (g_smsc_fdc37m81x_base)
91  val = smsc_fdc37m81x_rd(reg);
92 
93  return val;
94 }
95 
97 {
98  if (g_smsc_fdc37m81x_base)
99  smsc_dc37m81x_wr(reg, val);
100 }
101 
102 unsigned long __init smsc_fdc37m81x_init(unsigned long port)
103 {
104  const int field = sizeof(unsigned long) * 2;
105  u8 chip_id;
106 
107  if (g_smsc_fdc37m81x_base)
108  printk(KERN_WARNING "%s: stepping on old base=0x%0*lx\n",
109  __func__,
110  field, g_smsc_fdc37m81x_base);
111 
112  g_smsc_fdc37m81x_base = port;
113 
115 
116  chip_id = smsc_fdc37m81x_rd(SMSC_FDC37M81X_DID);
117  if (chip_id == SMSC_FDC37M81X_CHIP_ID)
119  else {
120  printk(KERN_WARNING "%s: unknown chip id 0x%02x\n", __func__,
121  chip_id);
122  g_smsc_fdc37m81x_base = 0;
123  }
124 
125  return g_smsc_fdc37m81x_base;
126 }
127 
128 #ifdef DEBUG
129 static void smsc_fdc37m81x_config_dump_one(const char *key, u8 dev, u8 reg)
130 {
131  printk(KERN_INFO "%s: dev=0x%02x reg=0x%02x val=0x%02x\n",
132  key, dev, reg,
133  smsc_fdc37m81x_rd(reg));
134 }
135 
136 void smsc_fdc37m81x_config_dump(void)
137 {
138  u8 orig;
139  const char *fname = __func__;
140 
142 
143  orig = smsc_fdc37m81x_rd(SMSC_FDC37M81X_DNUM);
144 
145  printk(KERN_INFO "%s: common\n", fname);
146  smsc_fdc37m81x_config_dump_one(fname, SMSC_FDC37M81X_NONE,
148  smsc_fdc37m81x_config_dump_one(fname, SMSC_FDC37M81X_NONE,
150  smsc_fdc37m81x_config_dump_one(fname, SMSC_FDC37M81X_NONE,
152  smsc_fdc37m81x_config_dump_one(fname, SMSC_FDC37M81X_NONE,
154  smsc_fdc37m81x_config_dump_one(fname, SMSC_FDC37M81X_NONE,
156 
157  printk(KERN_INFO "%s: keyboard\n", fname);
158  smsc_dc37m81x_wr(SMSC_FDC37M81X_DNUM, SMSC_FDC37M81X_KBD);
159  smsc_fdc37m81x_config_dump_one(fname, SMSC_FDC37M81X_KBD,
161  smsc_fdc37m81x_config_dump_one(fname, SMSC_FDC37M81X_KBD,
163  smsc_fdc37m81x_config_dump_one(fname, SMSC_FDC37M81X_KBD,
165  smsc_fdc37m81x_config_dump_one(fname, SMSC_FDC37M81X_KBD,
167 
168  smsc_dc37m81x_wr(SMSC_FDC37M81X_DNUM, orig);
169 
171 }
172 #endif