1 /*
2  * Interface for smsc fdc48m81x Super IO chip
3  *
4  * Author: MontaVista Software, Inc. source@mvista.com
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>
16 #include <asm/txx9/smsc_fdc37m81x.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 
71 void smsc_fdc37m81x_config_beg(void)
72 {
73 	if (g_smsc_fdc37m81x_base) {
74 		outb(SMSC_FDC37M81X_CONFIG_ENTER,
75 		     g_smsc_fdc37m81x_base + SMSC_FDC37M81X_CONFIG_INDEX);
76 	}
77 }
78 
79 void smsc_fdc37m81x_config_end(void)
80 {
81 	if (g_smsc_fdc37m81x_base)
82 		outb(SMSC_FDC37M81X_CONFIG_EXIT,
83 		     g_smsc_fdc37m81x_base + SMSC_FDC37M81X_CONFIG_INDEX);
84 }
85 
86 u8 smsc_fdc37m81x_config_get(u8 reg)
87 {
88 	u8 val = 0;
89 
90 	if (g_smsc_fdc37m81x_base)
91 		val = smsc_fdc37m81x_rd(reg);
92 
93 	return val;
94 }
95 
96 void smsc_fdc37m81x_config_set(u8 reg, u8 val)
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 		pr_warn("%s: stepping on old base=0x%0*lx\n", __func__, field,
109 			g_smsc_fdc37m81x_base);
110 
111 	g_smsc_fdc37m81x_base = port;
112 
113 	smsc_fdc37m81x_config_beg();
114 
115 	chip_id = smsc_fdc37m81x_rd(SMSC_FDC37M81X_DID);
116 	if (chip_id == SMSC_FDC37M81X_CHIP_ID)
117 		smsc_fdc37m81x_config_end();
118 	else {
119 		pr_warn("%s: unknown chip id 0x%02x\n", __func__, chip_id);
120 		g_smsc_fdc37m81x_base = 0;
121 	}
122 
123 	return g_smsc_fdc37m81x_base;
124 }
125 
126 #ifdef DEBUG
127 static void smsc_fdc37m81x_config_dump_one(const char *key, u8 dev, u8 reg)
128 {
129 	pr_info("%s: dev=0x%02x reg=0x%02x val=0x%02x\n", key, dev, reg,
130 		smsc_fdc37m81x_rd(reg));
131 }
132 
133 void smsc_fdc37m81x_config_dump(void)
134 {
135 	u8 orig;
136 	const char *fname = __func__;
137 
138 	smsc_fdc37m81x_config_beg();
139 
140 	orig = smsc_fdc37m81x_rd(SMSC_FDC37M81X_DNUM);
141 
142 	pr_info("%s: common\n", fname);
143 	smsc_fdc37m81x_config_dump_one(fname, SMSC_FDC37M81X_NONE,
144 				       SMSC_FDC37M81X_DNUM);
145 	smsc_fdc37m81x_config_dump_one(fname, SMSC_FDC37M81X_NONE,
146 				       SMSC_FDC37M81X_DID);
147 	smsc_fdc37m81x_config_dump_one(fname, SMSC_FDC37M81X_NONE,
148 				       SMSC_FDC37M81X_DREV);
149 	smsc_fdc37m81x_config_dump_one(fname, SMSC_FDC37M81X_NONE,
150 				       SMSC_FDC37M81X_PCNT);
151 	smsc_fdc37m81x_config_dump_one(fname, SMSC_FDC37M81X_NONE,
152 				       SMSC_FDC37M81X_PMGT);
153 
154 	pr_info("%s: keyboard\n", fname);
155 	smsc_dc37m81x_wr(SMSC_FDC37M81X_DNUM, SMSC_FDC37M81X_KBD);
156 	smsc_fdc37m81x_config_dump_one(fname, SMSC_FDC37M81X_KBD,
157 				       SMSC_FDC37M81X_ACTIVE);
158 	smsc_fdc37m81x_config_dump_one(fname, SMSC_FDC37M81X_KBD,
159 				       SMSC_FDC37M81X_INT);
160 	smsc_fdc37m81x_config_dump_one(fname, SMSC_FDC37M81X_KBD,
161 				       SMSC_FDC37M81X_INT2);
162 	smsc_fdc37m81x_config_dump_one(fname, SMSC_FDC37M81X_KBD,
163 				       SMSC_FDC37M81X_LDCR_F0);
164 
165 	smsc_dc37m81x_wr(SMSC_FDC37M81X_DNUM, orig);
166 
167 	smsc_fdc37m81x_config_end();
168 }
169 #endif
170