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210 lines
5.6 KiB
210 lines
5.6 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Copyright (C) 2005-2006 Micronas USA Inc. |
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*/ |
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#include <linux/module.h> |
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#include <linux/delay.h> |
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#include <linux/sched.h> |
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#include <linux/list.h> |
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#include <linux/unistd.h> |
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#include <linux/time.h> |
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#include <linux/device.h> |
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#include <linux/i2c.h> |
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#include <linux/mutex.h> |
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#include <linux/uaccess.h> |
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#include "go7007-priv.h" |
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/********************* Driver for on-board I2C adapter *********************/ |
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/* #define GO7007_I2C_DEBUG */ |
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#define SPI_I2C_ADDR_BASE 0x1400 |
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#define STATUS_REG_ADDR (SPI_I2C_ADDR_BASE + 0x2) |
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#define I2C_CTRL_REG_ADDR (SPI_I2C_ADDR_BASE + 0x6) |
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#define I2C_DEV_UP_ADDR_REG_ADDR (SPI_I2C_ADDR_BASE + 0x7) |
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#define I2C_LO_ADDR_REG_ADDR (SPI_I2C_ADDR_BASE + 0x8) |
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#define I2C_DATA_REG_ADDR (SPI_I2C_ADDR_BASE + 0x9) |
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#define I2C_CLKFREQ_REG_ADDR (SPI_I2C_ADDR_BASE + 0xa) |
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#define I2C_STATE_MASK 0x0007 |
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#define I2C_READ_READY_MASK 0x0008 |
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/* There is only one I2C port on the TW2804 that feeds all four GO7007 VIPs |
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* on the Adlink PCI-MPG24, so access is shared between all of them. */ |
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static DEFINE_MUTEX(adlink_mpg24_i2c_lock); |
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static int go7007_i2c_xfer(struct go7007 *go, u16 addr, int read, |
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u16 command, int flags, u8 *data) |
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{ |
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int i, ret = -EIO; |
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u16 val; |
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if (go->status == STATUS_SHUTDOWN) |
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return -ENODEV; |
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#ifdef GO7007_I2C_DEBUG |
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if (read) |
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dev_dbg(go->dev, "go7007-i2c: reading 0x%02x on 0x%02x\n", |
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command, addr); |
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else |
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dev_dbg(go->dev, |
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"go7007-i2c: writing 0x%02x to 0x%02x on 0x%02x\n", |
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*data, command, addr); |
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#endif |
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mutex_lock(&go->hw_lock); |
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if (go->board_id == GO7007_BOARDID_ADLINK_MPG24) { |
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/* Bridge the I2C port on this GO7007 to the shared bus */ |
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mutex_lock(&adlink_mpg24_i2c_lock); |
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go7007_write_addr(go, 0x3c82, 0x0020); |
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} |
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/* Wait for I2C adapter to be ready */ |
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for (i = 0; i < 10; ++i) { |
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if (go7007_read_addr(go, STATUS_REG_ADDR, &val) < 0) |
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goto i2c_done; |
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if (!(val & I2C_STATE_MASK)) |
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break; |
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msleep(100); |
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} |
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if (i == 10) { |
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dev_err(go->dev, "go7007-i2c: I2C adapter is hung\n"); |
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goto i2c_done; |
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} |
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/* Set target register (command) */ |
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go7007_write_addr(go, I2C_CTRL_REG_ADDR, flags); |
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go7007_write_addr(go, I2C_LO_ADDR_REG_ADDR, command); |
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/* If we're writing, send the data and target address and we're done */ |
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if (!read) { |
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go7007_write_addr(go, I2C_DATA_REG_ADDR, *data); |
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go7007_write_addr(go, I2C_DEV_UP_ADDR_REG_ADDR, |
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(addr << 9) | (command >> 8)); |
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ret = 0; |
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goto i2c_done; |
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} |
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/* Otherwise, we're reading. First clear i2c_rx_data_rdy. */ |
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if (go7007_read_addr(go, I2C_DATA_REG_ADDR, &val) < 0) |
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goto i2c_done; |
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/* Send the target address plus read flag */ |
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go7007_write_addr(go, I2C_DEV_UP_ADDR_REG_ADDR, |
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(addr << 9) | 0x0100 | (command >> 8)); |
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/* Wait for i2c_rx_data_rdy */ |
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for (i = 0; i < 10; ++i) { |
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if (go7007_read_addr(go, STATUS_REG_ADDR, &val) < 0) |
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goto i2c_done; |
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if (val & I2C_READ_READY_MASK) |
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break; |
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msleep(100); |
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} |
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if (i == 10) { |
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dev_err(go->dev, "go7007-i2c: I2C adapter is hung\n"); |
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goto i2c_done; |
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} |
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/* Retrieve the read byte */ |
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if (go7007_read_addr(go, I2C_DATA_REG_ADDR, &val) < 0) |
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goto i2c_done; |
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*data = val; |
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ret = 0; |
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i2c_done: |
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if (go->board_id == GO7007_BOARDID_ADLINK_MPG24) { |
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/* Isolate the I2C port on this GO7007 from the shared bus */ |
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go7007_write_addr(go, 0x3c82, 0x0000); |
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mutex_unlock(&adlink_mpg24_i2c_lock); |
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} |
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mutex_unlock(&go->hw_lock); |
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return ret; |
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} |
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static int go7007_smbus_xfer(struct i2c_adapter *adapter, u16 addr, |
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unsigned short flags, char read_write, |
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u8 command, int size, union i2c_smbus_data *data) |
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{ |
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struct go7007 *go = i2c_get_adapdata(adapter); |
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if (size != I2C_SMBUS_BYTE_DATA) |
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return -EIO; |
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return go7007_i2c_xfer(go, addr, read_write == I2C_SMBUS_READ, command, |
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flags & I2C_CLIENT_SCCB ? 0x10 : 0x00, &data->byte); |
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} |
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/* VERY LIMITED I2C master xfer function -- only needed because the |
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* SMBus functions only support 8-bit commands and the SAA7135 uses |
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* 16-bit commands. The I2C interface on the GO7007, as limited as |
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* it is, does support this mode. */ |
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static int go7007_i2c_master_xfer(struct i2c_adapter *adapter, |
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struct i2c_msg msgs[], int num) |
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{ |
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struct go7007 *go = i2c_get_adapdata(adapter); |
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int i; |
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for (i = 0; i < num; ++i) { |
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/* We can only do two things here -- write three bytes, or |
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* write two bytes and read one byte. */ |
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if (msgs[i].len == 2) { |
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if (i + 1 == num || msgs[i].addr != msgs[i + 1].addr || |
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(msgs[i].flags & I2C_M_RD) || |
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!(msgs[i + 1].flags & I2C_M_RD) || |
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msgs[i + 1].len != 1) |
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return -EIO; |
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if (go7007_i2c_xfer(go, msgs[i].addr, 1, |
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(msgs[i].buf[0] << 8) | msgs[i].buf[1], |
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0x01, &msgs[i + 1].buf[0]) < 0) |
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return -EIO; |
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++i; |
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} else if (msgs[i].len == 3) { |
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if (msgs[i].flags & I2C_M_RD) |
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return -EIO; |
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if (msgs[i].len != 3) |
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return -EIO; |
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if (go7007_i2c_xfer(go, msgs[i].addr, 0, |
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(msgs[i].buf[0] << 8) | msgs[i].buf[1], |
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0x01, &msgs[i].buf[2]) < 0) |
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return -EIO; |
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} else |
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return -EIO; |
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} |
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return num; |
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} |
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static u32 go7007_functionality(struct i2c_adapter *adapter) |
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{ |
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return I2C_FUNC_SMBUS_BYTE_DATA; |
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} |
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static const struct i2c_algorithm go7007_algo = { |
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.smbus_xfer = go7007_smbus_xfer, |
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.master_xfer = go7007_i2c_master_xfer, |
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.functionality = go7007_functionality, |
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}; |
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static struct i2c_adapter go7007_adap_templ = { |
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.owner = THIS_MODULE, |
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.name = "WIS GO7007SB", |
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.algo = &go7007_algo, |
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}; |
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int go7007_i2c_init(struct go7007 *go) |
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{ |
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memcpy(&go->i2c_adapter, &go7007_adap_templ, |
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sizeof(go7007_adap_templ)); |
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go->i2c_adapter.dev.parent = go->dev; |
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i2c_set_adapdata(&go->i2c_adapter, go); |
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if (i2c_add_adapter(&go->i2c_adapter) < 0) { |
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dev_err(go->dev, |
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"go7007-i2c: error: i2c_add_adapter failed\n"); |
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return -1; |
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} |
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return 0; |
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}
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