--- /dev/null
+/*
+ * Copyright (C) 2005-2006 Micronas USA Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License (Version 2) as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/module.h>
+#include <linux/delay.h>
+#include <linux/sched.h>
+#include <linux/list.h>
+#include <linux/unistd.h>
+#include <linux/time.h>
+#include <linux/device.h>
+#include <linux/i2c.h>
+#include <linux/mutex.h>
+#include <linux/uaccess.h>
+
+#include "go7007-priv.h"
+
+/********************* Driver for on-board I2C adapter *********************/
+
+/* #define GO7007_I2C_DEBUG */
+
+#define SPI_I2C_ADDR_BASE 0x1400
+#define STATUS_REG_ADDR (SPI_I2C_ADDR_BASE + 0x2)
+#define I2C_CTRL_REG_ADDR (SPI_I2C_ADDR_BASE + 0x6)
+#define I2C_DEV_UP_ADDR_REG_ADDR (SPI_I2C_ADDR_BASE + 0x7)
+#define I2C_LO_ADDR_REG_ADDR (SPI_I2C_ADDR_BASE + 0x8)
+#define I2C_DATA_REG_ADDR (SPI_I2C_ADDR_BASE + 0x9)
+#define I2C_CLKFREQ_REG_ADDR (SPI_I2C_ADDR_BASE + 0xa)
+
+#define I2C_STATE_MASK 0x0007
+#define I2C_READ_READY_MASK 0x0008
+
+/* There is only one I2C port on the TW2804 that feeds all four GO7007 VIPs
+ * on the Adlink PCI-MPG24, so access is shared between all of them. */
+static DEFINE_MUTEX(adlink_mpg24_i2c_lock);
+
+static int go7007_i2c_xfer(struct go7007 *go, u16 addr, int read,
+ u16 command, int flags, u8 *data)
+{
+ int i, ret = -EIO;
+ u16 val;
+
+ if (go->status == STATUS_SHUTDOWN)
+ return -ENODEV;
+
+#ifdef GO7007_I2C_DEBUG
+ if (read)
+ dev_dbg(go->dev, "go7007-i2c: reading 0x%02x on 0x%02x\n",
+ command, addr);
+ else
+ dev_dbg(go->dev,
+ "go7007-i2c: writing 0x%02x to 0x%02x on 0x%02x\n",
+ *data, command, addr);
+#endif
+
+ mutex_lock(&go->hw_lock);
+
+ if (go->board_id == GO7007_BOARDID_ADLINK_MPG24) {
+ /* Bridge the I2C port on this GO7007 to the shared bus */
+ mutex_lock(&adlink_mpg24_i2c_lock);
+ go7007_write_addr(go, 0x3c82, 0x0020);
+ }
+
+ /* Wait for I2C adapter to be ready */
+ for (i = 0; i < 10; ++i) {
+ if (go7007_read_addr(go, STATUS_REG_ADDR, &val) < 0)
+ goto i2c_done;
+ if (!(val & I2C_STATE_MASK))
+ break;
+ msleep(100);
+ }
+ if (i == 10) {
+ dev_err(go->dev, "go7007-i2c: I2C adapter is hung\n");
+ goto i2c_done;
+ }
+
+ /* Set target register (command) */
+ go7007_write_addr(go, I2C_CTRL_REG_ADDR, flags);
+ go7007_write_addr(go, I2C_LO_ADDR_REG_ADDR, command);
+
+ /* If we're writing, send the data and target address and we're done */
+ if (!read) {
+ go7007_write_addr(go, I2C_DATA_REG_ADDR, *data);
+ go7007_write_addr(go, I2C_DEV_UP_ADDR_REG_ADDR,
+ (addr << 9) | (command >> 8));
+ ret = 0;
+ goto i2c_done;
+ }
+
+ /* Otherwise, we're reading. First clear i2c_rx_data_rdy. */
+ if (go7007_read_addr(go, I2C_DATA_REG_ADDR, &val) < 0)
+ goto i2c_done;
+
+ /* Send the target address plus read flag */
+ go7007_write_addr(go, I2C_DEV_UP_ADDR_REG_ADDR,
+ (addr << 9) | 0x0100 | (command >> 8));
+
+ /* Wait for i2c_rx_data_rdy */
+ for (i = 0; i < 10; ++i) {
+ if (go7007_read_addr(go, STATUS_REG_ADDR, &val) < 0)
+ goto i2c_done;
+ if (val & I2C_READ_READY_MASK)
+ break;
+ msleep(100);
+ }
+ if (i == 10) {
+ dev_err(go->dev, "go7007-i2c: I2C adapter is hung\n");
+ goto i2c_done;
+ }
+
+ /* Retrieve the read byte */
+ if (go7007_read_addr(go, I2C_DATA_REG_ADDR, &val) < 0)
+ goto i2c_done;
+ *data = val;
+ ret = 0;
+
+i2c_done:
+ if (go->board_id == GO7007_BOARDID_ADLINK_MPG24) {
+ /* Isolate the I2C port on this GO7007 from the shared bus */
+ go7007_write_addr(go, 0x3c82, 0x0000);
+ mutex_unlock(&adlink_mpg24_i2c_lock);
+ }
+ mutex_unlock(&go->hw_lock);
+ return ret;
+}
+
+static int go7007_smbus_xfer(struct i2c_adapter *adapter, u16 addr,
+ unsigned short flags, char read_write,
+ u8 command, int size, union i2c_smbus_data *data)
+{
+ struct go7007 *go = i2c_get_adapdata(adapter);
+
+ if (size != I2C_SMBUS_BYTE_DATA)
+ return -EIO;
+ return go7007_i2c_xfer(go, addr, read_write == I2C_SMBUS_READ, command,
+ flags & I2C_CLIENT_SCCB ? 0x10 : 0x00, &data->byte);
+}
+
+/* VERY LIMITED I2C master xfer function -- only needed because the
+ * SMBus functions only support 8-bit commands and the SAA7135 uses
+ * 16-bit commands. The I2C interface on the GO7007, as limited as
+ * it is, does support this mode. */
+
+static int go7007_i2c_master_xfer(struct i2c_adapter *adapter,
+ struct i2c_msg msgs[], int num)
+{
+ struct go7007 *go = i2c_get_adapdata(adapter);
+ int i;
+
+ for (i = 0; i < num; ++i) {
+ /* We can only do two things here -- write three bytes, or
+ * write two bytes and read one byte. */
+ if (msgs[i].len == 2) {
+ if (i + 1 == num || msgs[i].addr != msgs[i + 1].addr ||
+ (msgs[i].flags & I2C_M_RD) ||
+ !(msgs[i + 1].flags & I2C_M_RD) ||
+ msgs[i + 1].len != 1)
+ return -EIO;
+ if (go7007_i2c_xfer(go, msgs[i].addr, 1,
+ (msgs[i].buf[0] << 8) | msgs[i].buf[1],
+ 0x01, &msgs[i + 1].buf[0]) < 0)
+ return -EIO;
+ ++i;
+ } else if (msgs[i].len == 3) {
+ if (msgs[i].flags & I2C_M_RD)
+ return -EIO;
+ if (msgs[i].len != 3)
+ return -EIO;
+ if (go7007_i2c_xfer(go, msgs[i].addr, 0,
+ (msgs[i].buf[0] << 8) | msgs[i].buf[1],
+ 0x01, &msgs[i].buf[2]) < 0)
+ return -EIO;
+ } else
+ return -EIO;
+ }
+
+ return num;
+}
+
+static u32 go7007_functionality(struct i2c_adapter *adapter)
+{
+ return I2C_FUNC_SMBUS_BYTE_DATA;
+}
+
+static struct i2c_algorithm go7007_algo = {
+ .smbus_xfer = go7007_smbus_xfer,
+ .master_xfer = go7007_i2c_master_xfer,
+ .functionality = go7007_functionality,
+};
+
+static struct i2c_adapter go7007_adap_templ = {
+ .owner = THIS_MODULE,
+ .name = "WIS GO7007SB",
+ .algo = &go7007_algo,
+};
+
+int go7007_i2c_init(struct go7007 *go)
+{
+ memcpy(&go->i2c_adapter, &go7007_adap_templ,
+ sizeof(go7007_adap_templ));
+ go->i2c_adapter.dev.parent = go->dev;
+ i2c_set_adapdata(&go->i2c_adapter, go);
+ if (i2c_add_adapter(&go->i2c_adapter) < 0) {
+ dev_err(go->dev,
+ "go7007-i2c: error: i2c_add_adapter failed\n");
+ return -1;
+ }
+ return 0;
+}
Code Review / kvmfornfv.git / blobdiff