blob: 0fe505d7abe9b65e93882862e98ba586b2e73407 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * Copyright (C) 2004 Steven J. Hill
3 * Copyright (C) 2001,2002,2003 Broadcom Corporation
Jean Delvare51c37112006-08-13 23:33:16 +02004 * Copyright (C) 1995-2000 Simon G. Vogl
Linus Torvalds1da177e2005-04-16 15:20:36 -07005 *
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
Jean Delvare51c37112006-08-13 23:33:16 +020021#include <linux/kernel.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070022#include <linux/module.h>
Jean Delvare51c37112006-08-13 23:33:16 +020023#include <linux/init.h>
24#include <linux/i2c.h>
H Hartley Sweeten21782182010-05-21 18:41:01 +020025#include <linux/io.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070026#include <asm/sibyte/sb1250_regs.h>
27#include <asm/sibyte/sb1250_smbus.h>
28
Jean Delvare51c37112006-08-13 23:33:16 +020029
30struct 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
Jean Delvare51c37112006-08-13 23:33:16 +020039
40static 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:
Guenter Roeck102b59c2010-07-10 09:42:47 +020097 return -EOPNOTSUPP;
Jean Delvare51c37112006-08-13 23:33:16 +020098 }
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));
Guenter Roeck102b59c2010-07-10 09:42:47 +0200107 return (error & M_SMB_ERROR_TYPE) ? -EIO : -ENXIO;
Jean Delvare51c37112006-08-13 23:33:16 +0200108 }
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
118static 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
Jean Delvare8f9082c2006-09-03 22:39:46 +0200127static const struct i2c_algorithm i2c_sibyte_algo = {
Jean Delvare51c37112006-08-13 23:33:16 +0200128 .smbus_xfer = smbus_xfer,
129 .functionality = bit_func,
130};
131
132/*
133 * registering functions to load algorithms at runtime
134 */
Maciej W. Rozyckib11a9d82008-05-11 20:37:05 +0200135static int __init i2c_sibyte_add_bus(struct i2c_adapter *i2c_adap, int speed)
Jean Delvare51c37112006-08-13 23:33:16 +0200136{
Jean Delvare51c37112006-08-13 23:33:16 +0200137 struct i2c_algo_sibyte_data *adap = i2c_adap->algo_data;
138
Maciej W. Rozyckib3eb5a0bc2008-05-11 20:37:05 +0200139 /* Register new adapter to i2c module... */
Jean Delvare51c37112006-08-13 23:33:16 +0200140 i2c_adap->algo = &i2c_sibyte_algo;
141
Maciej W. Rozyckib3eb5a0bc2008-05-11 20:37:05 +0200142 /* Set the requested frequency. */
Jean Delvare51c37112006-08-13 23:33:16 +0200143 csr_out32(speed, SMB_CSR(adap,R_SMB_FREQ));
144 csr_out32(0, SMB_CSR(adap,R_SMB_CONTROL));
145
Maciej W. Rozycki392a0402008-07-14 22:38:33 +0200146 return i2c_add_numbered_adapter(i2c_adap);
Jean Delvare51c37112006-08-13 23:33:16 +0200147}
148
149
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150static struct i2c_algo_sibyte_data sibyte_board_data[2] = {
Ralf Baechlea242b442005-08-09 10:07:57 -0700151 { NULL, 0, (void *) (CKSEG1+A_SMB_BASE(0)) },
152 { NULL, 1, (void *) (CKSEG1+A_SMB_BASE(1)) }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153};
154
155static struct i2c_adapter sibyte_board_adapter[2] = {
156 {
157 .owner = THIS_MODULE,
Jean Delvare3401b2f2008-07-14 22:38:29 +0200158 .class = I2C_CLASS_HWMON | I2C_CLASS_SPD,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159 .algo = NULL,
160 .algo_data = &sibyte_board_data[0],
Maciej W. Rozycki392a0402008-07-14 22:38:33 +0200161 .nr = 0,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162 .name = "SiByte SMBus 0",
163 },
164 {
165 .owner = THIS_MODULE,
Jean Delvare3401b2f2008-07-14 22:38:29 +0200166 .class = I2C_CLASS_HWMON | I2C_CLASS_SPD,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167 .algo = NULL,
168 .algo_data = &sibyte_board_data[1],
Maciej W. Rozycki392a0402008-07-14 22:38:33 +0200169 .nr = 1,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170 .name = "SiByte SMBus 1",
171 },
172};
173
174static int __init i2c_sibyte_init(void)
175{
Jean Delvare5cd6e672008-01-14 21:53:31 +0100176 pr_info("i2c-sibyte: i2c SMBus adapter module for SiByte board\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177 if (i2c_sibyte_add_bus(&sibyte_board_adapter[0], K_SMB_FREQ_100KHZ) < 0)
178 return -ENODEV;
Jean Delvare5cd6e672008-01-14 21:53:31 +0100179 if (i2c_sibyte_add_bus(&sibyte_board_adapter[1],
180 K_SMB_FREQ_400KHZ) < 0) {
181 i2c_del_adapter(&sibyte_board_adapter[0]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700182 return -ENODEV;
Jean Delvare5cd6e672008-01-14 21:53:31 +0100183 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184 return 0;
185}
186
187static void __exit i2c_sibyte_exit(void)
188{
Yoichi Yuasaae1390d2006-09-29 08:42:38 +0200189 i2c_del_adapter(&sibyte_board_adapter[0]);
190 i2c_del_adapter(&sibyte_board_adapter[1]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191}
192
193module_init(i2c_sibyte_init);
194module_exit(i2c_sibyte_exit);
195
Jean Delvare643bd3f2006-08-13 23:34:05 +0200196MODULE_AUTHOR("Kip Walker (Broadcom Corp.), Steven J. Hill <sjhill@realitydiluted.com>");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197MODULE_DESCRIPTION("SMBus adapter routines for SiByte boards");
198MODULE_LICENSE("GPL");