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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. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public License | |
14 | * along with this program; if not, write to the Free Software Foundation, | |
15 | * Inc., 59 Temple Place - Suite 330, Boston MA 02111-1307, USA. | |
16 | */ | |
17 | ||
866b8695 GKH |
18 | #include <linux/module.h> |
19 | #include <linux/init.h> | |
20 | #include <linux/delay.h> | |
21 | #include <linux/sched.h> | |
22 | #include <linux/list.h> | |
23 | #include <linux/unistd.h> | |
24 | #include <linux/time.h> | |
25 | #include <linux/device.h> | |
26 | #include <linux/i2c.h> | |
fd9a40da | 27 | #include <linux/mutex.h> |
866b8695 GKH |
28 | #include <linux/uaccess.h> |
29 | #include <asm/system.h> | |
30 | ||
31 | #include "go7007-priv.h" | |
32 | #include "wis-i2c.h" | |
33 | ||
866b8695 GKH |
34 | /********************* Driver for on-board I2C adapter *********************/ |
35 | ||
36 | /* #define GO7007_I2C_DEBUG */ | |
37 | ||
38 | #define SPI_I2C_ADDR_BASE 0x1400 | |
39 | #define STATUS_REG_ADDR (SPI_I2C_ADDR_BASE + 0x2) | |
40 | #define I2C_CTRL_REG_ADDR (SPI_I2C_ADDR_BASE + 0x6) | |
41 | #define I2C_DEV_UP_ADDR_REG_ADDR (SPI_I2C_ADDR_BASE + 0x7) | |
42 | #define I2C_LO_ADDR_REG_ADDR (SPI_I2C_ADDR_BASE + 0x8) | |
43 | #define I2C_DATA_REG_ADDR (SPI_I2C_ADDR_BASE + 0x9) | |
44 | #define I2C_CLKFREQ_REG_ADDR (SPI_I2C_ADDR_BASE + 0xa) | |
45 | ||
46 | #define I2C_STATE_MASK 0x0007 | |
47 | #define I2C_READ_READY_MASK 0x0008 | |
48 | ||
49 | /* There is only one I2C port on the TW2804 that feeds all four GO7007 VIPs | |
50 | * on the Adlink PCI-MPG24, so access is shared between all of them. */ | |
fd9a40da | 51 | static DEFINE_MUTEX(adlink_mpg24_i2c_lock); |
866b8695 GKH |
52 | |
53 | static int go7007_i2c_xfer(struct go7007 *go, u16 addr, int read, | |
54 | u16 command, int flags, u8 *data) | |
55 | { | |
56 | int i, ret = -1; | |
57 | u16 val; | |
58 | ||
59 | if (go->status == STATUS_SHUTDOWN) | |
60 | return -1; | |
61 | ||
62 | #ifdef GO7007_I2C_DEBUG | |
63 | if (read) | |
64 | printk(KERN_DEBUG "go7007-i2c: reading 0x%02x on 0x%02x\n", | |
65 | command, addr); | |
66 | else | |
67 | printk(KERN_DEBUG | |
68 | "go7007-i2c: writing 0x%02x to 0x%02x on 0x%02x\n", | |
69 | *data, command, addr); | |
70 | #endif | |
71 | ||
fd9a40da | 72 | mutex_lock(&go->hw_lock); |
866b8695 GKH |
73 | |
74 | if (go->board_id == GO7007_BOARDID_ADLINK_MPG24) { | |
75 | /* Bridge the I2C port on this GO7007 to the shared bus */ | |
fd9a40da | 76 | mutex_lock(&adlink_mpg24_i2c_lock); |
866b8695 GKH |
77 | go7007_write_addr(go, 0x3c82, 0x0020); |
78 | } | |
79 | ||
80 | /* Wait for I2C adapter to be ready */ | |
81 | for (i = 0; i < 10; ++i) { | |
82 | if (go7007_read_addr(go, STATUS_REG_ADDR, &val) < 0) | |
83 | goto i2c_done; | |
84 | if (!(val & I2C_STATE_MASK)) | |
85 | break; | |
86 | msleep(100); | |
87 | } | |
88 | if (i == 10) { | |
89 | printk(KERN_ERR "go7007-i2c: I2C adapter is hung\n"); | |
90 | goto i2c_done; | |
91 | } | |
92 | ||
93 | /* Set target register (command) */ | |
94 | go7007_write_addr(go, I2C_CTRL_REG_ADDR, flags); | |
95 | go7007_write_addr(go, I2C_LO_ADDR_REG_ADDR, command); | |
96 | ||
97 | /* If we're writing, send the data and target address and we're done */ | |
98 | if (!read) { | |
99 | go7007_write_addr(go, I2C_DATA_REG_ADDR, *data); | |
100 | go7007_write_addr(go, I2C_DEV_UP_ADDR_REG_ADDR, | |
101 | (addr << 9) | (command >> 8)); | |
102 | ret = 0; | |
103 | goto i2c_done; | |
104 | } | |
105 | ||
106 | /* Otherwise, we're reading. First clear i2c_rx_data_rdy. */ | |
107 | if (go7007_read_addr(go, I2C_DATA_REG_ADDR, &val) < 0) | |
108 | goto i2c_done; | |
109 | ||
110 | /* Send the target address plus read flag */ | |
111 | go7007_write_addr(go, I2C_DEV_UP_ADDR_REG_ADDR, | |
112 | (addr << 9) | 0x0100 | (command >> 8)); | |
113 | ||
114 | /* Wait for i2c_rx_data_rdy */ | |
115 | for (i = 0; i < 10; ++i) { | |
116 | if (go7007_read_addr(go, STATUS_REG_ADDR, &val) < 0) | |
117 | goto i2c_done; | |
118 | if (val & I2C_READ_READY_MASK) | |
119 | break; | |
120 | msleep(100); | |
121 | } | |
122 | if (i == 10) { | |
123 | printk(KERN_ERR "go7007-i2c: I2C adapter is hung\n"); | |
124 | goto i2c_done; | |
125 | } | |
126 | ||
127 | /* Retrieve the read byte */ | |
128 | if (go7007_read_addr(go, I2C_DATA_REG_ADDR, &val) < 0) | |
129 | goto i2c_done; | |
130 | *data = val; | |
131 | ret = 0; | |
132 | ||
133 | i2c_done: | |
134 | if (go->board_id == GO7007_BOARDID_ADLINK_MPG24) { | |
135 | /* Isolate the I2C port on this GO7007 from the shared bus */ | |
136 | go7007_write_addr(go, 0x3c82, 0x0000); | |
fd9a40da | 137 | mutex_unlock(&adlink_mpg24_i2c_lock); |
866b8695 | 138 | } |
fd9a40da | 139 | mutex_unlock(&go->hw_lock); |
866b8695 GKH |
140 | return ret; |
141 | } | |
142 | ||
143 | static int go7007_smbus_xfer(struct i2c_adapter *adapter, u16 addr, | |
144 | unsigned short flags, char read_write, | |
145 | u8 command, int size, union i2c_smbus_data *data) | |
146 | { | |
147 | struct go7007 *go = i2c_get_adapdata(adapter); | |
148 | ||
149 | if (size != I2C_SMBUS_BYTE_DATA) | |
150 | return -1; | |
151 | return go7007_i2c_xfer(go, addr, read_write == I2C_SMBUS_READ, command, | |
152 | flags & I2C_CLIENT_SCCB ? 0x10 : 0x00, &data->byte); | |
153 | } | |
154 | ||
155 | /* VERY LIMITED I2C master xfer function -- only needed because the | |
156 | * SMBus functions only support 8-bit commands and the SAA7135 uses | |
157 | * 16-bit commands. The I2C interface on the GO7007, as limited as | |
158 | * it is, does support this mode. */ | |
159 | ||
160 | static int go7007_i2c_master_xfer(struct i2c_adapter *adapter, | |
161 | struct i2c_msg msgs[], int num) | |
162 | { | |
163 | struct go7007 *go = i2c_get_adapdata(adapter); | |
164 | int i; | |
165 | ||
166 | for (i = 0; i < num; ++i) { | |
167 | /* We can only do two things here -- write three bytes, or | |
168 | * write two bytes and read one byte. */ | |
169 | if (msgs[i].len == 2) { | |
170 | if (i + 1 == num || msgs[i].addr != msgs[i + 1].addr || | |
171 | (msgs[i].flags & I2C_M_RD) || | |
172 | !(msgs[i + 1].flags & I2C_M_RD) || | |
173 | msgs[i + 1].len != 1) | |
174 | return -1; | |
175 | if (go7007_i2c_xfer(go, msgs[i].addr, 1, | |
176 | (msgs[i].buf[0] << 8) | msgs[i].buf[1], | |
177 | 0x01, &msgs[i + 1].buf[0]) < 0) | |
178 | return -1; | |
179 | ++i; | |
180 | } else if (msgs[i].len == 3) { | |
181 | if (msgs[i].flags & I2C_M_RD) | |
182 | return -1; | |
183 | if (msgs[i].len != 3) | |
184 | return -1; | |
185 | if (go7007_i2c_xfer(go, msgs[i].addr, 0, | |
186 | (msgs[i].buf[0] << 8) | msgs[i].buf[1], | |
187 | 0x01, &msgs[i].buf[2]) < 0) | |
188 | return -1; | |
189 | } else | |
190 | return -1; | |
191 | } | |
192 | ||
193 | return 0; | |
194 | } | |
195 | ||
196 | static u32 go7007_functionality(struct i2c_adapter *adapter) | |
197 | { | |
198 | return I2C_FUNC_SMBUS_BYTE_DATA; | |
199 | } | |
200 | ||
201 | static struct i2c_algorithm go7007_algo = { | |
202 | .smbus_xfer = go7007_smbus_xfer, | |
203 | .master_xfer = go7007_i2c_master_xfer, | |
204 | .functionality = go7007_functionality, | |
205 | }; | |
206 | ||
207 | static struct i2c_adapter go7007_adap_templ = { | |
208 | .owner = THIS_MODULE, | |
866b8695 | 209 | .name = "WIS GO7007SB", |
866b8695 GKH |
210 | .algo = &go7007_algo, |
211 | }; | |
212 | ||
213 | int go7007_i2c_init(struct go7007 *go) | |
214 | { | |
215 | memcpy(&go->i2c_adapter, &go7007_adap_templ, | |
216 | sizeof(go7007_adap_templ)); | |
217 | go->i2c_adapter.dev.parent = go->dev; | |
218 | i2c_set_adapdata(&go->i2c_adapter, go); | |
219 | if (i2c_add_adapter(&go->i2c_adapter) < 0) { | |
220 | printk(KERN_ERR | |
221 | "go7007-i2c: error: i2c_add_adapter failed\n"); | |
222 | return -1; | |
223 | } | |
224 | return 0; | |
225 | } |