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Diffstat (limited to 'drivers/i2c/algos/i2c-algo-sibyte.c')
-rw-r--r--drivers/i2c/algos/i2c-algo-sibyte.c186
1 files changed, 0 insertions, 186 deletions
diff --git a/drivers/i2c/algos/i2c-algo-sibyte.c b/drivers/i2c/algos/i2c-algo-sibyte.c
deleted file mode 100644
index 16d666fa16f3..000000000000
--- a/drivers/i2c/algos/i2c-algo-sibyte.c
+++ /dev/null
@@ -1,186 +0,0 @@
1/* ------------------------------------------------------------------------- */
2/* i2c-algo-sibyte.c i2c driver algorithms for bit-shift adapters */
3/* ------------------------------------------------------------------------- */
4/* Copyright (C) 2001,2002,2003 Broadcom Corporation
5 Copyright (C) 1995-2000 Simon G. Vogl
6
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
11
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
20/* ------------------------------------------------------------------------- */
21
22/* With some changes from Kyösti Mälkki <kmalkki@cc.hut.fi> and even
23 Frodo Looijaard <frodol@dds.nl>. */
24
25/* Ported for SiByte SOCs by Broadcom Corporation. */
26
27#include <linux/kernel.h>
28#include <linux/module.h>
29#include <linux/init.h>
30
31#include <asm/io.h>
32#include <asm/sibyte/sb1250_regs.h>
33#include <asm/sibyte/sb1250_smbus.h>
34
35#include <linux/i2c.h>
36#include <linux/i2c-algo-sibyte.h>
37
38/* ----- global defines ----------------------------------------------- */
39#define SMB_CSR(a,r) ((long)(a->reg_base + r))
40
41/* ----- global variables --------------------------------------------- */
42
43/* module parameters:
44 */
45static int bit_scan; /* have a look at what's hanging 'round */
46
47
48static int smbus_xfer(struct i2c_adapter *i2c_adap, u16 addr,
49 unsigned short flags, char read_write,
50 u8 command, int size, union i2c_smbus_data * data)
51{
52 struct i2c_algo_sibyte_data *adap = i2c_adap->algo_data;
53 int data_bytes = 0;
54 int error;
55
56 while (csr_in32(SMB_CSR(adap, R_SMB_STATUS)) & M_SMB_BUSY)
57 ;
58
59 switch (size) {
60 case I2C_SMBUS_QUICK:
61 csr_out32((V_SMB_ADDR(addr) | (read_write == I2C_SMBUS_READ ? M_SMB_QDATA : 0) |
62 V_SMB_TT_QUICKCMD), SMB_CSR(adap, R_SMB_START));
63 break;
64 case I2C_SMBUS_BYTE:
65 if (read_write == I2C_SMBUS_READ) {
66 csr_out32((V_SMB_ADDR(addr) | V_SMB_TT_RD1BYTE),
67 SMB_CSR(adap, R_SMB_START));
68 data_bytes = 1;
69 } else {
70 csr_out32(V_SMB_CMD(command), SMB_CSR(adap, R_SMB_CMD));
71 csr_out32((V_SMB_ADDR(addr) | V_SMB_TT_WR1BYTE),
72 SMB_CSR(adap, R_SMB_START));
73 }
74 break;
75 case I2C_SMBUS_BYTE_DATA:
76 csr_out32(V_SMB_CMD(command), SMB_CSR(adap, R_SMB_CMD));
77 if (read_write == I2C_SMBUS_READ) {
78 csr_out32((V_SMB_ADDR(addr) | V_SMB_TT_CMD_RD1BYTE),
79 SMB_CSR(adap, R_SMB_START));
80 data_bytes = 1;
81 } else {
82 csr_out32(V_SMB_LB(data->byte), SMB_CSR(adap, R_SMB_DATA));
83 csr_out32((V_SMB_ADDR(addr) | V_SMB_TT_WR2BYTE),
84 SMB_CSR(adap, R_SMB_START));
85 }
86 break;
87 case I2C_SMBUS_WORD_DATA:
88 csr_out32(V_SMB_CMD(command), SMB_CSR(adap, R_SMB_CMD));
89 if (read_write == I2C_SMBUS_READ) {
90 csr_out32((V_SMB_ADDR(addr) | V_SMB_TT_CMD_RD2BYTE),
91 SMB_CSR(adap, R_SMB_START));
92 data_bytes = 2;
93 } else {
94 csr_out32(V_SMB_LB(data->word & 0xff), SMB_CSR(adap, R_SMB_DATA));
95 csr_out32(V_SMB_MB(data->word >> 8), SMB_CSR(adap, R_SMB_DATA));
96 csr_out32((V_SMB_ADDR(addr) | V_SMB_TT_WR2BYTE),
97 SMB_CSR(adap, R_SMB_START));
98 }
99 break;
100 default:
101 return -1; /* XXXKW better error code? */
102 }
103
104 while (csr_in32(SMB_CSR(adap, R_SMB_STATUS)) & M_SMB_BUSY)
105 ;
106
107 error = csr_in32(SMB_CSR(adap, R_SMB_STATUS));
108 if (error & M_SMB_ERROR) {
109 /* Clear error bit by writing a 1 */
110 csr_out32(M_SMB_ERROR, SMB_CSR(adap, R_SMB_STATUS));
111 return -1; /* XXXKW better error code? */
112 }
113
114 if (data_bytes == 1)
115 data->byte = csr_in32(SMB_CSR(adap, R_SMB_DATA)) & 0xff;
116 if (data_bytes == 2)
117 data->word = csr_in32(SMB_CSR(adap, R_SMB_DATA)) & 0xffff;
118
119 return 0;
120}
121
122static u32 bit_func(struct i2c_adapter *adap)
123{
124 return (I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE |
125 I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA);
126}
127
128
129/* -----exported algorithm data: ------------------------------------- */
130
131static struct i2c_algorithm i2c_sibyte_algo = {
132 .smbus_xfer = smbus_xfer,
133 .functionality = bit_func,
134};
135
136/*
137 * registering functions to load algorithms at runtime
138 */
139int i2c_sibyte_add_bus(struct i2c_adapter *i2c_adap, int speed)
140{
141 int i;
142 struct i2c_algo_sibyte_data *adap = i2c_adap->algo_data;
143
144 /* register new adapter to i2c module... */
145 i2c_adap->algo = &i2c_sibyte_algo;
146
147 /* Set the frequency to 100 kHz */
148 csr_out32(speed, SMB_CSR(adap,R_SMB_FREQ));
149 csr_out32(0, SMB_CSR(adap,R_SMB_CONTROL));
150
151 /* scan bus */
152 if (bit_scan) {
153 union i2c_smbus_data data;
154 int rc;
155 printk(KERN_INFO " i2c-algo-sibyte.o: scanning bus %s.\n",
156 i2c_adap->name);
157 for (i = 0x00; i < 0x7f; i++) {
158 /* XXXKW is this a realistic probe? */
159 rc = smbus_xfer(i2c_adap, i, 0, I2C_SMBUS_READ, 0,
160 I2C_SMBUS_BYTE_DATA, &data);
161 if (!rc) {
162 printk("(%02x)",i);
163 } else
164 printk(".");
165 }
166 printk("\n");
167 }
168
169 return i2c_add_adapter(i2c_adap);
170}
171
172
173int i2c_sibyte_del_bus(struct i2c_adapter *adap)
174{
175 return i2c_del_adapter(adap);
176}
177
178
179EXPORT_SYMBOL(i2c_sibyte_add_bus);
180EXPORT_SYMBOL(i2c_sibyte_del_bus);
181
182MODULE_AUTHOR("Kip Walker, Broadcom Corp.");
183MODULE_DESCRIPTION("SiByte I2C-Bus algorithm");
184module_param(bit_scan, int, 0);
185MODULE_PARM_DESC(bit_scan, "Scan for active chips on the bus");
186MODULE_LICENSE("GPL");
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