1 // SPDX-License-Identifier: GPL-2.0-only
3  * Copyright (C) 2005-2006 Micronas USA Inc.
17 #include "go7007-priv.h"
19 /********************* Driver for on-board I2C adapter *********************/
34 /* There is only one I2C port on the TW2804 that feeds all four GO7007 VIPs
35  * on the Adlink PCI-MPG24, so access is shared between all of them. */
38 static inline void adlink_mpg24_i2c_lock(struct go7007 *go)  in adlink_mpg24_i2c_lock()  argument
40 	/* Bridge the I2C port on this GO7007 to the shared bus */  in adlink_mpg24_i2c_lock()
42 	go7007_write_addr(go, 0x3c82, 0x0020);  in adlink_mpg24_i2c_lock()
45 static inline void adlink_mpg24_i2c_unlock(struct go7007 *go)  in adlink_mpg24_i2c_unlock()  argument
47 	/* Isolate the I2C port on this GO7007 from the shared bus */  in adlink_mpg24_i2c_unlock()
48 	go7007_write_addr(go, 0x3c82, 0x0000);  in adlink_mpg24_i2c_unlock()
52 static int go7007_i2c_xfer(struct go7007 *go, u16 addr, int read,  in go7007_i2c_xfer()  argument
55 	int i, ret = -EIO;  in go7007_i2c_xfer()
58 	if (go->status == STATUS_SHUTDOWN)  in go7007_i2c_xfer()
59 		return -ENODEV;  in go7007_i2c_xfer()
63 		dev_dbg(go->dev, "go7007-i2c: reading 0x%02x on 0x%02x\n",  in go7007_i2c_xfer()
66 		dev_dbg(go->dev,  in go7007_i2c_xfer()
67 			"go7007-i2c: writing 0x%02x to 0x%02x on 0x%02x\n",  in go7007_i2c_xfer()
71 	mutex_lock(&go->hw_lock);  in go7007_i2c_xfer()
73 	if (go->board_id == GO7007_BOARDID_ADLINK_MPG24)  in go7007_i2c_xfer()
74 		adlink_mpg24_i2c_lock(go);  in go7007_i2c_xfer()
78 		if (go7007_read_addr(go, STATUS_REG_ADDR, &val) < 0)  in go7007_i2c_xfer()
85 		dev_err(go->dev, "go7007-i2c: I2C adapter is hung\n");  in go7007_i2c_xfer()
90 	go7007_write_addr(go, I2C_CTRL_REG_ADDR, flags);  in go7007_i2c_xfer()
91 	go7007_write_addr(go, I2C_LO_ADDR_REG_ADDR, command);  in go7007_i2c_xfer()
93 	/* If we're writing, send the data and target address and we're done */  in go7007_i2c_xfer()
95 		go7007_write_addr(go, I2C_DATA_REG_ADDR, *data);  in go7007_i2c_xfer()
96 		go7007_write_addr(go, I2C_DEV_UP_ADDR_REG_ADDR,  in go7007_i2c_xfer()
103 	if (go7007_read_addr(go, I2C_DATA_REG_ADDR, &val) < 0)  in go7007_i2c_xfer()
106 	/* Send the target address plus read flag */  in go7007_i2c_xfer()
107 	go7007_write_addr(go, I2C_DEV_UP_ADDR_REG_ADDR,  in go7007_i2c_xfer()
112 		if (go7007_read_addr(go, STATUS_REG_ADDR, &val) < 0)  in go7007_i2c_xfer()
119 		dev_err(go->dev, "go7007-i2c: I2C adapter is hung\n");  in go7007_i2c_xfer()
123 	/* Retrieve the read byte */  in go7007_i2c_xfer()
124 	if (go7007_read_addr(go, I2C_DATA_REG_ADDR, &val) < 0)  in go7007_i2c_xfer()
130 	if (go->board_id == GO7007_BOARDID_ADLINK_MPG24)  in go7007_i2c_xfer()
131 		adlink_mpg24_i2c_unlock(go);  in go7007_i2c_xfer()
132 	mutex_unlock(&go->hw_lock);  in go7007_i2c_xfer()
140 	struct go7007 *go = i2c_get_adapdata(adapter);  in go7007_smbus_xfer()  local
143 		return -EIO;  in go7007_smbus_xfer()
144 	return go7007_i2c_xfer(go, addr, read_write == I2C_SMBUS_READ, command,  in go7007_smbus_xfer()
145 			flags & I2C_CLIENT_SCCB ? 0x10 : 0x00, &data->byte);  in go7007_smbus_xfer()
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
156 	struct go7007 *go = i2c_get_adapdata(adapter);  in go7007_i2c_master_xfer()  local
160 		/* We can only do two things here -- write three bytes, or  in go7007_i2c_master_xfer()
167 				return -EIO;  in go7007_i2c_master_xfer()
168 			if (go7007_i2c_xfer(go, msgs[i].addr, 1,  in go7007_i2c_master_xfer()
171 				return -EIO;  in go7007_i2c_master_xfer()
175 				return -EIO;  in go7007_i2c_master_xfer()
176 			if (go7007_i2c_xfer(go, msgs[i].addr, 0,  in go7007_i2c_master_xfer()
179 				return -EIO;  in go7007_i2c_master_xfer()
181 			return -EIO;  in go7007_i2c_master_xfer()
204 int go7007_i2c_init(struct go7007 *go)  in go7007_i2c_init()  argument
206 	memcpy(&go->i2c_adapter, &go7007_adap_templ,  in go7007_i2c_init()
208 	go->i2c_adapter.dev.parent = go->dev;  in go7007_i2c_init()
209 	i2c_set_adapdata(&go->i2c_adapter, go);  in go7007_i2c_init()
210 	if (i2c_add_adapter(&go->i2c_adapter) < 0) {  in go7007_i2c_init()
211 		dev_err(go->dev,  in go7007_i2c_init()
212 			"go7007-i2c: error: i2c_add_adapter failed\n");  in go7007_i2c_init()
213 		return -1;  in go7007_i2c_init()