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1 | /* | |
2 | * Copyright (C) 2004 Steven J. Hill | |
3 | * Copyright (C) 2001,2002,2003 Broadcom Corporation | |
4 | * Copyright (C) 1995-2000 Simon G. Vogl | |
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 | ||
17 | #include <linux/kernel.h> | |
18 | #include <linux/module.h> | |
19 | #include <linux/init.h> | |
20 | #include <linux/i2c.h> | |
21 | #include <linux/io.h> | |
22 | #include <asm/sibyte/sb1250_regs.h> | |
23 | #include <asm/sibyte/sb1250_smbus.h> | |
24 | ||
25 | ||
26 | struct i2c_algo_sibyte_data { | |
27 | void *data; /* private data */ | |
28 | int bus; /* which bus */ | |
29 | void *reg_base; /* CSR base */ | |
30 | }; | |
31 | ||
32 | /* ----- global defines ----------------------------------------------- */ | |
33 | #define SMB_CSR(a,r) ((long)(a->reg_base + r)) | |
34 | ||
35 | ||
36 | static int smbus_xfer(struct i2c_adapter *i2c_adap, u16 addr, | |
37 | unsigned short flags, char read_write, | |
38 | u8 command, int size, union i2c_smbus_data * data) | |
39 | { | |
40 | struct i2c_algo_sibyte_data *adap = i2c_adap->algo_data; | |
41 | int data_bytes = 0; | |
42 | int error; | |
43 | ||
44 | while (csr_in32(SMB_CSR(adap, R_SMB_STATUS)) & M_SMB_BUSY) | |
45 | ; | |
46 | ||
47 | switch (size) { | |
48 | case I2C_SMBUS_QUICK: | |
49 | csr_out32((V_SMB_ADDR(addr) | | |
50 | (read_write == I2C_SMBUS_READ ? M_SMB_QDATA : 0) | | |
51 | V_SMB_TT_QUICKCMD), SMB_CSR(adap, R_SMB_START)); | |
52 | break; | |
53 | case I2C_SMBUS_BYTE: | |
54 | if (read_write == I2C_SMBUS_READ) { | |
55 | csr_out32((V_SMB_ADDR(addr) | V_SMB_TT_RD1BYTE), | |
56 | SMB_CSR(adap, R_SMB_START)); | |
57 | data_bytes = 1; | |
58 | } else { | |
59 | csr_out32(V_SMB_CMD(command), SMB_CSR(adap, R_SMB_CMD)); | |
60 | csr_out32((V_SMB_ADDR(addr) | V_SMB_TT_WR1BYTE), | |
61 | SMB_CSR(adap, R_SMB_START)); | |
62 | } | |
63 | break; | |
64 | case I2C_SMBUS_BYTE_DATA: | |
65 | csr_out32(V_SMB_CMD(command), SMB_CSR(adap, R_SMB_CMD)); | |
66 | if (read_write == I2C_SMBUS_READ) { | |
67 | csr_out32((V_SMB_ADDR(addr) | V_SMB_TT_CMD_RD1BYTE), | |
68 | SMB_CSR(adap, R_SMB_START)); | |
69 | data_bytes = 1; | |
70 | } else { | |
71 | csr_out32(V_SMB_LB(data->byte), | |
72 | SMB_CSR(adap, R_SMB_DATA)); | |
73 | csr_out32((V_SMB_ADDR(addr) | V_SMB_TT_WR2BYTE), | |
74 | SMB_CSR(adap, R_SMB_START)); | |
75 | } | |
76 | break; | |
77 | case I2C_SMBUS_WORD_DATA: | |
78 | csr_out32(V_SMB_CMD(command), SMB_CSR(adap, R_SMB_CMD)); | |
79 | if (read_write == I2C_SMBUS_READ) { | |
80 | csr_out32((V_SMB_ADDR(addr) | V_SMB_TT_CMD_RD2BYTE), | |
81 | SMB_CSR(adap, R_SMB_START)); | |
82 | data_bytes = 2; | |
83 | } else { | |
84 | csr_out32(V_SMB_LB(data->word & 0xff), | |
85 | SMB_CSR(adap, R_SMB_DATA)); | |
86 | csr_out32(V_SMB_MB(data->word >> 8), | |
87 | SMB_CSR(adap, R_SMB_DATA)); | |
88 | csr_out32((V_SMB_ADDR(addr) | V_SMB_TT_WR2BYTE), | |
89 | SMB_CSR(adap, R_SMB_START)); | |
90 | } | |
91 | break; | |
92 | default: | |
93 | return -EOPNOTSUPP; | |
94 | } | |
95 | ||
96 | while (csr_in32(SMB_CSR(adap, R_SMB_STATUS)) & M_SMB_BUSY) | |
97 | ; | |
98 | ||
99 | error = csr_in32(SMB_CSR(adap, R_SMB_STATUS)); | |
100 | if (error & M_SMB_ERROR) { | |
101 | /* Clear error bit by writing a 1 */ | |
102 | csr_out32(M_SMB_ERROR, SMB_CSR(adap, R_SMB_STATUS)); | |
103 | return (error & M_SMB_ERROR_TYPE) ? -EIO : -ENXIO; | |
104 | } | |
105 | ||
106 | if (data_bytes == 1) | |
107 | data->byte = csr_in32(SMB_CSR(adap, R_SMB_DATA)) & 0xff; | |
108 | if (data_bytes == 2) | |
109 | data->word = csr_in32(SMB_CSR(adap, R_SMB_DATA)) & 0xffff; | |
110 | ||
111 | return 0; | |
112 | } | |
113 | ||
114 | static u32 bit_func(struct i2c_adapter *adap) | |
115 | { | |
116 | return (I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE | | |
117 | I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA); | |
118 | } | |
119 | ||
120 | ||
121 | /* -----exported algorithm data: ------------------------------------- */ | |
122 | ||
123 | static const struct i2c_algorithm i2c_sibyte_algo = { | |
124 | .smbus_xfer = smbus_xfer, | |
125 | .functionality = bit_func, | |
126 | }; | |
127 | ||
128 | /* | |
129 | * registering functions to load algorithms at runtime | |
130 | */ | |
131 | static int __init i2c_sibyte_add_bus(struct i2c_adapter *i2c_adap, int speed) | |
132 | { | |
133 | struct i2c_algo_sibyte_data *adap = i2c_adap->algo_data; | |
134 | ||
135 | /* Register new adapter to i2c module... */ | |
136 | i2c_adap->algo = &i2c_sibyte_algo; | |
137 | ||
138 | /* Set the requested frequency. */ | |
139 | csr_out32(speed, SMB_CSR(adap,R_SMB_FREQ)); | |
140 | csr_out32(0, SMB_CSR(adap,R_SMB_CONTROL)); | |
141 | ||
142 | return i2c_add_numbered_adapter(i2c_adap); | |
143 | } | |
144 | ||
145 | ||
146 | static struct i2c_algo_sibyte_data sibyte_board_data[2] = { | |
147 | { NULL, 0, (void *) (CKSEG1+A_SMB_BASE(0)) }, | |
148 | { NULL, 1, (void *) (CKSEG1+A_SMB_BASE(1)) } | |
149 | }; | |
150 | ||
151 | static struct i2c_adapter sibyte_board_adapter[2] = { | |
152 | { | |
153 | .owner = THIS_MODULE, | |
154 | .class = I2C_CLASS_HWMON | I2C_CLASS_SPD, | |
155 | .algo = NULL, | |
156 | .algo_data = &sibyte_board_data[0], | |
157 | .nr = 0, | |
158 | .name = "SiByte SMBus 0", | |
159 | }, | |
160 | { | |
161 | .owner = THIS_MODULE, | |
162 | .class = I2C_CLASS_HWMON | I2C_CLASS_SPD, | |
163 | .algo = NULL, | |
164 | .algo_data = &sibyte_board_data[1], | |
165 | .nr = 1, | |
166 | .name = "SiByte SMBus 1", | |
167 | }, | |
168 | }; | |
169 | ||
170 | static int __init i2c_sibyte_init(void) | |
171 | { | |
172 | pr_info("i2c-sibyte: i2c SMBus adapter module for SiByte board\n"); | |
173 | if (i2c_sibyte_add_bus(&sibyte_board_adapter[0], K_SMB_FREQ_100KHZ) < 0) | |
174 | return -ENODEV; | |
175 | if (i2c_sibyte_add_bus(&sibyte_board_adapter[1], | |
176 | K_SMB_FREQ_400KHZ) < 0) { | |
177 | i2c_del_adapter(&sibyte_board_adapter[0]); | |
178 | return -ENODEV; | |
179 | } | |
180 | return 0; | |
181 | } | |
182 | ||
183 | static void __exit i2c_sibyte_exit(void) | |
184 | { | |
185 | i2c_del_adapter(&sibyte_board_adapter[0]); | |
186 | i2c_del_adapter(&sibyte_board_adapter[1]); | |
187 | } | |
188 | ||
189 | module_init(i2c_sibyte_init); | |
190 | module_exit(i2c_sibyte_exit); | |
191 | ||
192 | MODULE_AUTHOR("Kip Walker (Broadcom Corp.), Steven J. Hill <sjhill@realitydiluted.com>"); | |
193 | MODULE_DESCRIPTION("SMBus adapter routines for SiByte boards"); | |
194 | MODULE_LICENSE("GPL"); |