// 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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