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c942fddf | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 LT |
2 | /* |
3 | * Copyright (C) 2004 Steven J. Hill | |
4 | * Copyright (C) 2001,2002,2003 Broadcom Corporation | |
51c37117 | 5 | * Copyright (C) 1995-2000 Simon G. Vogl |
1da177e4 LT |
6 | */ |
7 | ||
51c37117 | 8 | #include <linux/kernel.h> |
1da177e4 | 9 | #include <linux/module.h> |
51c37117 JD |
10 | #include <linux/init.h> |
11 | #include <linux/i2c.h> | |
21782180 | 12 | #include <linux/io.h> |
1da177e4 LT |
13 | #include <asm/sibyte/sb1250_regs.h> |
14 | #include <asm/sibyte/sb1250_smbus.h> | |
15 | ||
51c37117 JD |
16 | |
17 | struct i2c_algo_sibyte_data { | |
18 | void *data; /* private data */ | |
19 | int bus; /* which bus */ | |
20 | void *reg_base; /* CSR base */ | |
21 | }; | |
22 | ||
23 | /* ----- global defines ----------------------------------------------- */ | |
24 | #define SMB_CSR(a,r) ((long)(a->reg_base + r)) | |
25 | ||
51c37117 JD |
26 | |
27 | static int smbus_xfer(struct i2c_adapter *i2c_adap, u16 addr, | |
28 | unsigned short flags, char read_write, | |
29 | u8 command, int size, union i2c_smbus_data * data) | |
30 | { | |
31 | struct i2c_algo_sibyte_data *adap = i2c_adap->algo_data; | |
32 | int data_bytes = 0; | |
33 | int error; | |
34 | ||
35 | while (csr_in32(SMB_CSR(adap, R_SMB_STATUS)) & M_SMB_BUSY) | |
36 | ; | |
37 | ||
38 | switch (size) { | |
39 | case I2C_SMBUS_QUICK: | |
40 | csr_out32((V_SMB_ADDR(addr) | | |
41 | (read_write == I2C_SMBUS_READ ? M_SMB_QDATA : 0) | | |
42 | V_SMB_TT_QUICKCMD), SMB_CSR(adap, R_SMB_START)); | |
43 | break; | |
44 | case I2C_SMBUS_BYTE: | |
45 | if (read_write == I2C_SMBUS_READ) { | |
46 | csr_out32((V_SMB_ADDR(addr) | V_SMB_TT_RD1BYTE), | |
47 | SMB_CSR(adap, R_SMB_START)); | |
48 | data_bytes = 1; | |
49 | } else { | |
50 | csr_out32(V_SMB_CMD(command), SMB_CSR(adap, R_SMB_CMD)); | |
51 | csr_out32((V_SMB_ADDR(addr) | V_SMB_TT_WR1BYTE), | |
52 | SMB_CSR(adap, R_SMB_START)); | |
53 | } | |
54 | break; | |
55 | case I2C_SMBUS_BYTE_DATA: | |
56 | csr_out32(V_SMB_CMD(command), SMB_CSR(adap, R_SMB_CMD)); | |
57 | if (read_write == I2C_SMBUS_READ) { | |
58 | csr_out32((V_SMB_ADDR(addr) | V_SMB_TT_CMD_RD1BYTE), | |
59 | SMB_CSR(adap, R_SMB_START)); | |
60 | data_bytes = 1; | |
61 | } else { | |
62 | csr_out32(V_SMB_LB(data->byte), | |
63 | SMB_CSR(adap, R_SMB_DATA)); | |
64 | csr_out32((V_SMB_ADDR(addr) | V_SMB_TT_WR2BYTE), | |
65 | SMB_CSR(adap, R_SMB_START)); | |
66 | } | |
67 | break; | |
68 | case I2C_SMBUS_WORD_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_RD2BYTE), | |
72 | SMB_CSR(adap, R_SMB_START)); | |
73 | data_bytes = 2; | |
74 | } else { | |
75 | csr_out32(V_SMB_LB(data->word & 0xff), | |
76 | SMB_CSR(adap, R_SMB_DATA)); | |
77 | csr_out32(V_SMB_MB(data->word >> 8), | |
78 | SMB_CSR(adap, R_SMB_DATA)); | |
79 | csr_out32((V_SMB_ADDR(addr) | V_SMB_TT_WR2BYTE), | |
80 | SMB_CSR(adap, R_SMB_START)); | |
81 | } | |
82 | break; | |
83 | default: | |
102b59c6 | 84 | return -EOPNOTSUPP; |
51c37117 JD |
85 | } |
86 | ||
87 | while (csr_in32(SMB_CSR(adap, R_SMB_STATUS)) & M_SMB_BUSY) | |
88 | ; | |
89 | ||
90 | error = csr_in32(SMB_CSR(adap, R_SMB_STATUS)); | |
91 | if (error & M_SMB_ERROR) { | |
92 | /* Clear error bit by writing a 1 */ | |
93 | csr_out32(M_SMB_ERROR, SMB_CSR(adap, R_SMB_STATUS)); | |
102b59c6 | 94 | return (error & M_SMB_ERROR_TYPE) ? -EIO : -ENXIO; |
51c37117 JD |
95 | } |
96 | ||
97 | if (data_bytes == 1) | |
98 | data->byte = csr_in32(SMB_CSR(adap, R_SMB_DATA)) & 0xff; | |
99 | if (data_bytes == 2) | |
100 | data->word = csr_in32(SMB_CSR(adap, R_SMB_DATA)) & 0xffff; | |
101 | ||
102 | return 0; | |
103 | } | |
104 | ||
105 | static u32 bit_func(struct i2c_adapter *adap) | |
106 | { | |
107 | return (I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE | | |
108 | I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA); | |
109 | } | |
110 | ||
111 | ||
112 | /* -----exported algorithm data: ------------------------------------- */ | |
113 | ||
8f9082c5 | 114 | static const struct i2c_algorithm i2c_sibyte_algo = { |
51c37117 JD |
115 | .smbus_xfer = smbus_xfer, |
116 | .functionality = bit_func, | |
117 | }; | |
118 | ||
119 | /* | |
120 | * registering functions to load algorithms at runtime | |
121 | */ | |
b11a9d83 | 122 | static int __init i2c_sibyte_add_bus(struct i2c_adapter *i2c_adap, int speed) |
51c37117 | 123 | { |
51c37117 JD |
124 | struct i2c_algo_sibyte_data *adap = i2c_adap->algo_data; |
125 | ||
b3eb5a0b | 126 | /* Register new adapter to i2c module... */ |
51c37117 JD |
127 | i2c_adap->algo = &i2c_sibyte_algo; |
128 | ||
b3eb5a0b | 129 | /* Set the requested frequency. */ |
51c37117 JD |
130 | csr_out32(speed, SMB_CSR(adap,R_SMB_FREQ)); |
131 | csr_out32(0, SMB_CSR(adap,R_SMB_CONTROL)); | |
132 | ||
392a0408 | 133 | return i2c_add_numbered_adapter(i2c_adap); |
51c37117 JD |
134 | } |
135 | ||
136 | ||
1da177e4 | 137 | static struct i2c_algo_sibyte_data sibyte_board_data[2] = { |
a242b44d RB |
138 | { NULL, 0, (void *) (CKSEG1+A_SMB_BASE(0)) }, |
139 | { NULL, 1, (void *) (CKSEG1+A_SMB_BASE(1)) } | |
1da177e4 LT |
140 | }; |
141 | ||
142 | static struct i2c_adapter sibyte_board_adapter[2] = { | |
143 | { | |
144 | .owner = THIS_MODULE, | |
3401b2ff | 145 | .class = I2C_CLASS_HWMON | I2C_CLASS_SPD, |
1da177e4 LT |
146 | .algo = NULL, |
147 | .algo_data = &sibyte_board_data[0], | |
392a0408 | 148 | .nr = 0, |
1da177e4 LT |
149 | .name = "SiByte SMBus 0", |
150 | }, | |
151 | { | |
152 | .owner = THIS_MODULE, | |
3401b2ff | 153 | .class = I2C_CLASS_HWMON | I2C_CLASS_SPD, |
1da177e4 LT |
154 | .algo = NULL, |
155 | .algo_data = &sibyte_board_data[1], | |
392a0408 | 156 | .nr = 1, |
1da177e4 LT |
157 | .name = "SiByte SMBus 1", |
158 | }, | |
159 | }; | |
160 | ||
161 | static int __init i2c_sibyte_init(void) | |
162 | { | |
5cd6e675 | 163 | pr_info("i2c-sibyte: i2c SMBus adapter module for SiByte board\n"); |
1da177e4 LT |
164 | if (i2c_sibyte_add_bus(&sibyte_board_adapter[0], K_SMB_FREQ_100KHZ) < 0) |
165 | return -ENODEV; | |
5cd6e675 JD |
166 | if (i2c_sibyte_add_bus(&sibyte_board_adapter[1], |
167 | K_SMB_FREQ_400KHZ) < 0) { | |
168 | i2c_del_adapter(&sibyte_board_adapter[0]); | |
1da177e4 | 169 | return -ENODEV; |
5cd6e675 | 170 | } |
1da177e4 LT |
171 | return 0; |
172 | } | |
173 | ||
174 | static void __exit i2c_sibyte_exit(void) | |
175 | { | |
ae1390d8 YY |
176 | i2c_del_adapter(&sibyte_board_adapter[0]); |
177 | i2c_del_adapter(&sibyte_board_adapter[1]); | |
1da177e4 LT |
178 | } |
179 | ||
180 | module_init(i2c_sibyte_init); | |
181 | module_exit(i2c_sibyte_exit); | |
182 | ||
643bd3fb | 183 | MODULE_AUTHOR("Kip Walker (Broadcom Corp.), Steven J. Hill <sjhill@realitydiluted.com>"); |
1da177e4 LT |
184 | MODULE_DESCRIPTION("SMBus adapter routines for SiByte boards"); |
185 | MODULE_LICENSE("GPL"); |