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1da177e4 LT |
1 | /* |
2 | * Copyright (C) 2004 Steven J. Hill | |
3 | * Copyright (C) 2001,2002,2003 Broadcom Corporation | |
51c37117 | 4 | * Copyright (C) 1995-2000 Simon G. Vogl |
1da177e4 LT |
5 | * |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU General Public License | |
8 | * as published by the Free Software Foundation; either version 2 | |
9 | * of the License, or (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, write to the Free Software | |
18 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
19 | */ | |
20 | ||
51c37117 | 21 | #include <linux/kernel.h> |
1da177e4 | 22 | #include <linux/module.h> |
51c37117 JD |
23 | #include <linux/init.h> |
24 | #include <linux/i2c.h> | |
25 | #include <asm/io.h> | |
1da177e4 LT |
26 | #include <asm/sibyte/sb1250_regs.h> |
27 | #include <asm/sibyte/sb1250_smbus.h> | |
28 | ||
51c37117 JD |
29 | |
30 | struct i2c_algo_sibyte_data { | |
31 | void *data; /* private data */ | |
32 | int bus; /* which bus */ | |
33 | void *reg_base; /* CSR base */ | |
34 | }; | |
35 | ||
36 | /* ----- global defines ----------------------------------------------- */ | |
37 | #define SMB_CSR(a,r) ((long)(a->reg_base + r)) | |
38 | ||
51c37117 JD |
39 | |
40 | static int smbus_xfer(struct i2c_adapter *i2c_adap, u16 addr, | |
41 | unsigned short flags, char read_write, | |
42 | u8 command, int size, union i2c_smbus_data * data) | |
43 | { | |
44 | struct i2c_algo_sibyte_data *adap = i2c_adap->algo_data; | |
45 | int data_bytes = 0; | |
46 | int error; | |
47 | ||
48 | while (csr_in32(SMB_CSR(adap, R_SMB_STATUS)) & M_SMB_BUSY) | |
49 | ; | |
50 | ||
51 | switch (size) { | |
52 | case I2C_SMBUS_QUICK: | |
53 | csr_out32((V_SMB_ADDR(addr) | | |
54 | (read_write == I2C_SMBUS_READ ? M_SMB_QDATA : 0) | | |
55 | V_SMB_TT_QUICKCMD), SMB_CSR(adap, R_SMB_START)); | |
56 | break; | |
57 | case I2C_SMBUS_BYTE: | |
58 | if (read_write == I2C_SMBUS_READ) { | |
59 | csr_out32((V_SMB_ADDR(addr) | V_SMB_TT_RD1BYTE), | |
60 | SMB_CSR(adap, R_SMB_START)); | |
61 | data_bytes = 1; | |
62 | } else { | |
63 | csr_out32(V_SMB_CMD(command), SMB_CSR(adap, R_SMB_CMD)); | |
64 | csr_out32((V_SMB_ADDR(addr) | V_SMB_TT_WR1BYTE), | |
65 | SMB_CSR(adap, R_SMB_START)); | |
66 | } | |
67 | break; | |
68 | case I2C_SMBUS_BYTE_DATA: | |
69 | csr_out32(V_SMB_CMD(command), SMB_CSR(adap, R_SMB_CMD)); | |
70 | if (read_write == I2C_SMBUS_READ) { | |
71 | csr_out32((V_SMB_ADDR(addr) | V_SMB_TT_CMD_RD1BYTE), | |
72 | SMB_CSR(adap, R_SMB_START)); | |
73 | data_bytes = 1; | |
74 | } else { | |
75 | csr_out32(V_SMB_LB(data->byte), | |
76 | SMB_CSR(adap, R_SMB_DATA)); | |
77 | csr_out32((V_SMB_ADDR(addr) | V_SMB_TT_WR2BYTE), | |
78 | SMB_CSR(adap, R_SMB_START)); | |
79 | } | |
80 | break; | |
81 | case I2C_SMBUS_WORD_DATA: | |
82 | csr_out32(V_SMB_CMD(command), SMB_CSR(adap, R_SMB_CMD)); | |
83 | if (read_write == I2C_SMBUS_READ) { | |
84 | csr_out32((V_SMB_ADDR(addr) | V_SMB_TT_CMD_RD2BYTE), | |
85 | SMB_CSR(adap, R_SMB_START)); | |
86 | data_bytes = 2; | |
87 | } else { | |
88 | csr_out32(V_SMB_LB(data->word & 0xff), | |
89 | SMB_CSR(adap, R_SMB_DATA)); | |
90 | csr_out32(V_SMB_MB(data->word >> 8), | |
91 | SMB_CSR(adap, R_SMB_DATA)); | |
92 | csr_out32((V_SMB_ADDR(addr) | V_SMB_TT_WR2BYTE), | |
93 | SMB_CSR(adap, R_SMB_START)); | |
94 | } | |
95 | break; | |
96 | default: | |
97 | return -1; /* XXXKW better error code? */ | |
98 | } | |
99 | ||
100 | while (csr_in32(SMB_CSR(adap, R_SMB_STATUS)) & M_SMB_BUSY) | |
101 | ; | |
102 | ||
103 | error = csr_in32(SMB_CSR(adap, R_SMB_STATUS)); | |
104 | if (error & M_SMB_ERROR) { | |
105 | /* Clear error bit by writing a 1 */ | |
106 | csr_out32(M_SMB_ERROR, SMB_CSR(adap, R_SMB_STATUS)); | |
107 | return -1; /* XXXKW better error code? */ | |
108 | } | |
109 | ||
110 | if (data_bytes == 1) | |
111 | data->byte = csr_in32(SMB_CSR(adap, R_SMB_DATA)) & 0xff; | |
112 | if (data_bytes == 2) | |
113 | data->word = csr_in32(SMB_CSR(adap, R_SMB_DATA)) & 0xffff; | |
114 | ||
115 | return 0; | |
116 | } | |
117 | ||
118 | static u32 bit_func(struct i2c_adapter *adap) | |
119 | { | |
120 | return (I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE | | |
121 | I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA); | |
122 | } | |
123 | ||
124 | ||
125 | /* -----exported algorithm data: ------------------------------------- */ | |
126 | ||
8f9082c5 | 127 | static const struct i2c_algorithm i2c_sibyte_algo = { |
51c37117 JD |
128 | .smbus_xfer = smbus_xfer, |
129 | .functionality = bit_func, | |
130 | }; | |
131 | ||
132 | /* | |
133 | * registering functions to load algorithms at runtime | |
134 | */ | |
5271071b | 135 | int __init i2c_sibyte_add_bus(struct i2c_adapter *i2c_adap, int speed) |
51c37117 | 136 | { |
51c37117 JD |
137 | struct i2c_algo_sibyte_data *adap = i2c_adap->algo_data; |
138 | ||
139 | /* register new adapter to i2c module... */ | |
140 | i2c_adap->algo = &i2c_sibyte_algo; | |
141 | ||
142 | /* Set the frequency to 100 kHz */ | |
143 | csr_out32(speed, SMB_CSR(adap,R_SMB_FREQ)); | |
144 | csr_out32(0, SMB_CSR(adap,R_SMB_CONTROL)); | |
145 | ||
51c37117 JD |
146 | return i2c_add_adapter(i2c_adap); |
147 | } | |
148 | ||
149 | ||
1da177e4 | 150 | static struct i2c_algo_sibyte_data sibyte_board_data[2] = { |
a242b44d RB |
151 | { NULL, 0, (void *) (CKSEG1+A_SMB_BASE(0)) }, |
152 | { NULL, 1, (void *) (CKSEG1+A_SMB_BASE(1)) } | |
1da177e4 LT |
153 | }; |
154 | ||
155 | static struct i2c_adapter sibyte_board_adapter[2] = { | |
156 | { | |
157 | .owner = THIS_MODULE, | |
158 | .id = I2C_HW_SIBYTE, | |
159 | .class = I2C_CLASS_HWMON, | |
160 | .algo = NULL, | |
161 | .algo_data = &sibyte_board_data[0], | |
162 | .name = "SiByte SMBus 0", | |
163 | }, | |
164 | { | |
165 | .owner = THIS_MODULE, | |
166 | .id = I2C_HW_SIBYTE, | |
167 | .class = I2C_CLASS_HWMON, | |
168 | .algo = NULL, | |
169 | .algo_data = &sibyte_board_data[1], | |
170 | .name = "SiByte SMBus 1", | |
171 | }, | |
172 | }; | |
173 | ||
174 | static int __init i2c_sibyte_init(void) | |
175 | { | |
5cd6e675 | 176 | pr_info("i2c-sibyte: i2c SMBus adapter module for SiByte board\n"); |
1da177e4 LT |
177 | if (i2c_sibyte_add_bus(&sibyte_board_adapter[0], K_SMB_FREQ_100KHZ) < 0) |
178 | return -ENODEV; | |
5cd6e675 JD |
179 | if (i2c_sibyte_add_bus(&sibyte_board_adapter[1], |
180 | K_SMB_FREQ_400KHZ) < 0) { | |
181 | i2c_del_adapter(&sibyte_board_adapter[0]); | |
1da177e4 | 182 | return -ENODEV; |
5cd6e675 | 183 | } |
1da177e4 LT |
184 | return 0; |
185 | } | |
186 | ||
187 | static void __exit i2c_sibyte_exit(void) | |
188 | { | |
ae1390d8 YY |
189 | i2c_del_adapter(&sibyte_board_adapter[0]); |
190 | i2c_del_adapter(&sibyte_board_adapter[1]); | |
1da177e4 LT |
191 | } |
192 | ||
193 | module_init(i2c_sibyte_init); | |
194 | module_exit(i2c_sibyte_exit); | |
195 | ||
643bd3fb | 196 | MODULE_AUTHOR("Kip Walker (Broadcom Corp.), Steven J. Hill <sjhill@realitydiluted.com>"); |
1da177e4 LT |
197 | MODULE_DESCRIPTION("SMBus adapter routines for SiByte boards"); |
198 | MODULE_LICENSE("GPL"); |