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866b8695 GKH |
1 | /* |
2 | * Copyright (C) 2005-2006 Micronas USA Inc. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License (Version 2) as | |
6 | * published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
11 | * GNU General Public License for more details. | |
866b8695 GKH |
12 | */ |
13 | ||
866b8695 | 14 | #include <linux/module.h> |
866b8695 GKH |
15 | #include <linux/delay.h> |
16 | #include <linux/sched.h> | |
17 | #include <linux/list.h> | |
18 | #include <linux/unistd.h> | |
19 | #include <linux/time.h> | |
20 | #include <linux/device.h> | |
21 | #include <linux/i2c.h> | |
fd9a40da | 22 | #include <linux/mutex.h> |
866b8695 | 23 | #include <linux/uaccess.h> |
866b8695 GKH |
24 | |
25 | #include "go7007-priv.h" | |
866b8695 | 26 | |
866b8695 GKH |
27 | /********************* Driver for on-board I2C adapter *********************/ |
28 | ||
29 | /* #define GO7007_I2C_DEBUG */ | |
30 | ||
31 | #define SPI_I2C_ADDR_BASE 0x1400 | |
32 | #define STATUS_REG_ADDR (SPI_I2C_ADDR_BASE + 0x2) | |
33 | #define I2C_CTRL_REG_ADDR (SPI_I2C_ADDR_BASE + 0x6) | |
34 | #define I2C_DEV_UP_ADDR_REG_ADDR (SPI_I2C_ADDR_BASE + 0x7) | |
35 | #define I2C_LO_ADDR_REG_ADDR (SPI_I2C_ADDR_BASE + 0x8) | |
36 | #define I2C_DATA_REG_ADDR (SPI_I2C_ADDR_BASE + 0x9) | |
37 | #define I2C_CLKFREQ_REG_ADDR (SPI_I2C_ADDR_BASE + 0xa) | |
38 | ||
39 | #define I2C_STATE_MASK 0x0007 | |
40 | #define I2C_READ_READY_MASK 0x0008 | |
41 | ||
42 | /* There is only one I2C port on the TW2804 that feeds all four GO7007 VIPs | |
43 | * on the Adlink PCI-MPG24, so access is shared between all of them. */ | |
fd9a40da | 44 | static DEFINE_MUTEX(adlink_mpg24_i2c_lock); |
866b8695 GKH |
45 | |
46 | static int go7007_i2c_xfer(struct go7007 *go, u16 addr, int read, | |
47 | u16 command, int flags, u8 *data) | |
48 | { | |
ffb97493 | 49 | int i, ret = -EIO; |
866b8695 GKH |
50 | u16 val; |
51 | ||
52 | if (go->status == STATUS_SHUTDOWN) | |
ffb97493 | 53 | return -ENODEV; |
866b8695 GKH |
54 | |
55 | #ifdef GO7007_I2C_DEBUG | |
56 | if (read) | |
afc2e8a0 | 57 | dev_dbg(go->dev, "go7007-i2c: reading 0x%02x on 0x%02x\n", |
866b8695 GKH |
58 | command, addr); |
59 | else | |
afc2e8a0 | 60 | dev_dbg(go->dev, |
866b8695 GKH |
61 | "go7007-i2c: writing 0x%02x to 0x%02x on 0x%02x\n", |
62 | *data, command, addr); | |
63 | #endif | |
64 | ||
fd9a40da | 65 | mutex_lock(&go->hw_lock); |
866b8695 GKH |
66 | |
67 | if (go->board_id == GO7007_BOARDID_ADLINK_MPG24) { | |
68 | /* Bridge the I2C port on this GO7007 to the shared bus */ | |
fd9a40da | 69 | mutex_lock(&adlink_mpg24_i2c_lock); |
866b8695 GKH |
70 | go7007_write_addr(go, 0x3c82, 0x0020); |
71 | } | |
72 | ||
73 | /* Wait for I2C adapter to be ready */ | |
74 | for (i = 0; i < 10; ++i) { | |
75 | if (go7007_read_addr(go, STATUS_REG_ADDR, &val) < 0) | |
76 | goto i2c_done; | |
77 | if (!(val & I2C_STATE_MASK)) | |
78 | break; | |
79 | msleep(100); | |
80 | } | |
81 | if (i == 10) { | |
afc2e8a0 | 82 | dev_err(go->dev, "go7007-i2c: I2C adapter is hung\n"); |
866b8695 GKH |
83 | goto i2c_done; |
84 | } | |
85 | ||
86 | /* Set target register (command) */ | |
87 | go7007_write_addr(go, I2C_CTRL_REG_ADDR, flags); | |
88 | go7007_write_addr(go, I2C_LO_ADDR_REG_ADDR, command); | |
89 | ||
90 | /* If we're writing, send the data and target address and we're done */ | |
91 | if (!read) { | |
92 | go7007_write_addr(go, I2C_DATA_REG_ADDR, *data); | |
93 | go7007_write_addr(go, I2C_DEV_UP_ADDR_REG_ADDR, | |
94 | (addr << 9) | (command >> 8)); | |
95 | ret = 0; | |
96 | goto i2c_done; | |
97 | } | |
98 | ||
99 | /* Otherwise, we're reading. First clear i2c_rx_data_rdy. */ | |
100 | if (go7007_read_addr(go, I2C_DATA_REG_ADDR, &val) < 0) | |
101 | goto i2c_done; | |
102 | ||
103 | /* Send the target address plus read flag */ | |
104 | go7007_write_addr(go, I2C_DEV_UP_ADDR_REG_ADDR, | |
105 | (addr << 9) | 0x0100 | (command >> 8)); | |
106 | ||
107 | /* Wait for i2c_rx_data_rdy */ | |
108 | for (i = 0; i < 10; ++i) { | |
109 | if (go7007_read_addr(go, STATUS_REG_ADDR, &val) < 0) | |
110 | goto i2c_done; | |
111 | if (val & I2C_READ_READY_MASK) | |
112 | break; | |
113 | msleep(100); | |
114 | } | |
115 | if (i == 10) { | |
afc2e8a0 | 116 | dev_err(go->dev, "go7007-i2c: I2C adapter is hung\n"); |
866b8695 GKH |
117 | goto i2c_done; |
118 | } | |
119 | ||
120 | /* Retrieve the read byte */ | |
121 | if (go7007_read_addr(go, I2C_DATA_REG_ADDR, &val) < 0) | |
122 | goto i2c_done; | |
123 | *data = val; | |
124 | ret = 0; | |
125 | ||
126 | i2c_done: | |
127 | if (go->board_id == GO7007_BOARDID_ADLINK_MPG24) { | |
128 | /* Isolate the I2C port on this GO7007 from the shared bus */ | |
129 | go7007_write_addr(go, 0x3c82, 0x0000); | |
fd9a40da | 130 | mutex_unlock(&adlink_mpg24_i2c_lock); |
866b8695 | 131 | } |
fd9a40da | 132 | mutex_unlock(&go->hw_lock); |
866b8695 GKH |
133 | return ret; |
134 | } | |
135 | ||
136 | static int go7007_smbus_xfer(struct i2c_adapter *adapter, u16 addr, | |
137 | unsigned short flags, char read_write, | |
138 | u8 command, int size, union i2c_smbus_data *data) | |
139 | { | |
140 | struct go7007 *go = i2c_get_adapdata(adapter); | |
141 | ||
142 | if (size != I2C_SMBUS_BYTE_DATA) | |
ffb97493 | 143 | return -EIO; |
866b8695 GKH |
144 | return go7007_i2c_xfer(go, addr, read_write == I2C_SMBUS_READ, command, |
145 | flags & I2C_CLIENT_SCCB ? 0x10 : 0x00, &data->byte); | |
146 | } | |
147 | ||
148 | /* VERY LIMITED I2C master xfer function -- only needed because the | |
149 | * SMBus functions only support 8-bit commands and the SAA7135 uses | |
150 | * 16-bit commands. The I2C interface on the GO7007, as limited as | |
151 | * it is, does support this mode. */ | |
152 | ||
153 | static int go7007_i2c_master_xfer(struct i2c_adapter *adapter, | |
154 | struct i2c_msg msgs[], int num) | |
155 | { | |
156 | struct go7007 *go = i2c_get_adapdata(adapter); | |
157 | int i; | |
158 | ||
159 | for (i = 0; i < num; ++i) { | |
160 | /* We can only do two things here -- write three bytes, or | |
161 | * write two bytes and read one byte. */ | |
162 | if (msgs[i].len == 2) { | |
163 | if (i + 1 == num || msgs[i].addr != msgs[i + 1].addr || | |
164 | (msgs[i].flags & I2C_M_RD) || | |
165 | !(msgs[i + 1].flags & I2C_M_RD) || | |
166 | msgs[i + 1].len != 1) | |
ffb97493 | 167 | return -EIO; |
866b8695 GKH |
168 | if (go7007_i2c_xfer(go, msgs[i].addr, 1, |
169 | (msgs[i].buf[0] << 8) | msgs[i].buf[1], | |
170 | 0x01, &msgs[i + 1].buf[0]) < 0) | |
ffb97493 | 171 | return -EIO; |
866b8695 GKH |
172 | ++i; |
173 | } else if (msgs[i].len == 3) { | |
174 | if (msgs[i].flags & I2C_M_RD) | |
ffb97493 | 175 | return -EIO; |
866b8695 | 176 | if (msgs[i].len != 3) |
ffb97493 | 177 | return -EIO; |
866b8695 GKH |
178 | if (go7007_i2c_xfer(go, msgs[i].addr, 0, |
179 | (msgs[i].buf[0] << 8) | msgs[i].buf[1], | |
180 | 0x01, &msgs[i].buf[2]) < 0) | |
ffb97493 | 181 | return -EIO; |
866b8695 | 182 | } else |
ffb97493 | 183 | return -EIO; |
866b8695 GKH |
184 | } |
185 | ||
ffb97493 | 186 | return num; |
866b8695 GKH |
187 | } |
188 | ||
189 | static u32 go7007_functionality(struct i2c_adapter *adapter) | |
190 | { | |
191 | return I2C_FUNC_SMBUS_BYTE_DATA; | |
192 | } | |
193 | ||
194 | static struct i2c_algorithm go7007_algo = { | |
195 | .smbus_xfer = go7007_smbus_xfer, | |
196 | .master_xfer = go7007_i2c_master_xfer, | |
197 | .functionality = go7007_functionality, | |
198 | }; | |
199 | ||
200 | static struct i2c_adapter go7007_adap_templ = { | |
201 | .owner = THIS_MODULE, | |
866b8695 | 202 | .name = "WIS GO7007SB", |
866b8695 GKH |
203 | .algo = &go7007_algo, |
204 | }; | |
205 | ||
206 | int go7007_i2c_init(struct go7007 *go) | |
207 | { | |
208 | memcpy(&go->i2c_adapter, &go7007_adap_templ, | |
209 | sizeof(go7007_adap_templ)); | |
210 | go->i2c_adapter.dev.parent = go->dev; | |
211 | i2c_set_adapdata(&go->i2c_adapter, go); | |
212 | if (i2c_add_adapter(&go->i2c_adapter) < 0) { | |
afc2e8a0 | 213 | dev_err(go->dev, |
866b8695 GKH |
214 | "go7007-i2c: error: i2c_add_adapter failed\n"); |
215 | return -1; | |
216 | } | |
217 | return 0; | |
218 | } |