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/*
* Copyright (C) 2005-2010 Freescale Semiconductor, Inc. All Rights Reserved.
*/
/*
* The code contained herein is licensed under the GNU General Public
* License. You may obtain a copy of the GNU General Public License
* Version 2 or later at the following locations:
*
* http://www.opensource.org/licenses/gpl-license.html
* http://www.gnu.org/copyleft/gpl.html
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/err.h>
#include <linux/platform_device.h>
#include <linux/usb/fsl_xcvr.h>
#include <linux/i2c.h>
#include <mach/arc_otg.h>
/*
* ISP1301 register addresses,all register of ISP1301
* is one-byte length register
*/
/* ISP1301: I2C device address */
#define ISP1301_DEV_ADDR 0x2D
/* ISP 1301 register set*/
#define ISP1301_MODE_REG1_SET 0x04
#define ISP1301_MODE_REG1_CLR 0x05
#define ISP1301_CTRL_REG1_SET 0x06
#define ISP1301_CTRL_REG1_CLR 0x07
#define ISP1301_INT_SRC_REG 0x08
#define ISP1301_INT_LAT_REG_SET 0x0a
#define ISP1301_INT_LAT_REG_CLR 0x0b
#define ISP1301_INT_FALSE_REG_SET 0x0c
#define ISP1301_INT_FALSE_REG_CLR 0x0d
#define ISP1301_INT_TRUE_REG_SET 0x0e
#define ISP1301_INT_TRUE_REG_CLR 0x0f
#define ISP1301_CTRL_REG2_SET 0x10
#define ISP1301_CTRL_REG2_CLR 0x11
#define ISP1301_MODE_REG2_SET 0x12
#define ISP1301_MODE_REG2_CLR 0x13
#define ISP1301_BCD_DEV_REG0 0x14
#define ISP1301_BCD_DEV_REG1 0x15
/* OTG Control register bit description */
#define DP_PULLUP 0x01
#define DM_PULLUP 0x02
#define DP_PULLDOWN 0x04
#define DM_PULLDOWN 0x08
#define ID_PULLDOWN 0x10
#define VBUS_DRV 0x20
#define VBUS_DISCHRG 0x40
#define VBUS_CHRG 0x80
/* Mode Control 1 register bit description */
#define SPEED_REG 0x01
#define SUSPEND_REG 0x02
#define DAT_SE0 0x04
#define TRANSP_EN 0x08
#define BDIS_ACON_EN 0x10
#define OE_INT_EN 0x20
#define UART_EN 0x40
/* Mode Control 2 register bit description */
#define SPD_SUSP_CTRL 0x02
#define BI_DI 0x04
static int isp1301_attach(struct i2c_adapter *adapter);
static int isp1301_detach(struct i2c_client *client);
static struct i2c_driver isp1301_i2c_driver = {
.driver = {
.owner = THIS_MODULE,
.name = "isp1301 Client",
},
.attach_adapter = isp1301_attach,
.detach_client = isp1301_detach,
};
static struct i2c_client isp1301_i2c_client = {
.name = "isp1301 I2C dev",
.addr = ISP1301_DEV_ADDR,
.driver = &isp1301_i2c_driver,
};
static unsigned short normal_i2c[] = { ISP1301_DEV_ADDR, I2C_CLIENT_END };
/* Magic definition of all other variables and things */
I2C_CLIENT_INSMOD;
static int isp1301_detect_client(struct i2c_adapter *adapter, int address,
int kind)
{
isp1301_i2c_client.adapter = adapter;
if (i2c_attach_client(&isp1301_i2c_client)) {
isp1301_i2c_client.adapter = NULL;
printk(KERN_ERR "isp1301_attach: i2c_attach_client failed\n");
return -1;
}
printk(KERN_INFO "isp1301 Detected\n");
return 0;
}
/*!
* isp1301 I2C attach function
*
* @param adapter struct i2c_adapter *
* @return Error code indicating success or failure
*/
static int isp1301_attach(struct i2c_adapter *adapter)
{
return i2c_probe(adapter, &addr_data, &isp1301_detect_client);
}
/*!
* isp1301 I2C detach function
*
* @param client struct i2c_client *
* @return Error code indicating success or failure
*/
static int isp1301_detach(struct i2c_client *client)
{
int err;
if (!isp1301_i2c_client.adapter)
return -1;
err = i2c_detach_client(&isp1301_i2c_client);
isp1301_i2c_client.adapter = NULL;
return err;
}
static void isp1301_init(struct fsl_xcvr_ops *this)
{
pr_debug("%s\n", __FUNCTION__);
i2c_add_driver(&isp1301_i2c_driver);
}
static void isp1301_uninit(struct fsl_xcvr_ops *this)
{
/* DDD do this for host only:*/
/* disable OTG VBUS */
i2c_del_driver(&isp1301_i2c_driver);
}
/* Write ISP1301 register*/
static inline void isp1301_write_reg(char reg, char data)
{
i2c_smbus_write_byte_data(&isp1301_i2c_client, reg, data);
}
/* read ISP1301 register*/
static inline char isp1301_read_reg(char reg)
{
return i2c_smbus_read_byte_data(&isp1301_i2c_client, reg);
}
/* set ISP1301 as USB host*/
static inline void isp1301_set_serial_host(void)
{
pr_debug("%s\n", __FUNCTION__);
isp1301_write_reg(ISP1301_MODE_REG2_CLR, 0xFF);
#if defined(CONFIG_MXC_USB_SB3) || defined(CONFIG_MXC_USB_DB4)
isp1301_write_reg(ISP1301_MODE_REG2_SET, SPD_SUSP_CTRL | BI_DI);
#else
isp1301_write_reg(ISP1301_MODE_REG2_SET, SPD_SUSP_CTRL);
#endif
isp1301_write_reg(ISP1301_MODE_REG1_CLR, 0xFF);
#if defined(CONFIG_MXC_USB_SB3) || defined(CONFIG_MXC_USB_SU6)
isp1301_write_reg(ISP1301_MODE_REG1_SET, DAT_SE0 | SPEED_REG);
#else
isp1301_write_reg(ISP1301_MODE_REG1_SET, SPEED_REG);
#endif
/* configure transceiver for host mode */
isp1301_write_reg(ISP1301_CTRL_REG1_SET,
(VBUS_DRV | DP_PULLDOWN | DM_PULLDOWN));
}
/* set ISP1301 as USB device */
static inline void isp1301_set_serial_dev(void)
{
pr_debug("%s\n", __FUNCTION__);
isp1301_write_reg(ISP1301_MODE_REG2_CLR, 0xFF);
#if defined(CONFIG_MXC_USB_SB3) || defined(CONFIG_MXC_USB_DB4)
isp1301_write_reg(ISP1301_MODE_REG2_SET, SPD_SUSP_CTRL | BI_DI);
#else
isp1301_write_reg(ISP1301_MODE_REG2_SET, SPD_SUSP_CTRL);
#endif
isp1301_write_reg(ISP1301_MODE_REG1_CLR, 0xFF);
#if defined(CONFIG_MXC_USB_SB3) || defined(CONFIG_MXC_USB_SU6)
isp1301_write_reg(ISP1301_MODE_REG1_SET, DAT_SE0 | SPEED_REG);
#else
isp1301_write_reg(ISP1301_MODE_REG1_SET, SPEED_REG);
#endif
/* FS mode, DP pull down, DM pull down */
isp1301_write_reg(ISP1301_CTRL_REG1_SET,
(DP_PULLDOWN | DM_PULLDOWN | DP_PULLUP));
}
static void isp1301_set_vbus_power(struct fsl_xcvr_ops *this,
struct fsl_usb2_platform_data *pdata, int on)
{
pr_debug("%s(on=%d)\n", __FUNCTION__, on);
if (on) {
/* disable D+ pull-up */
isp1301_write_reg(ISP1301_CTRL_REG1_CLR, DP_PULLUP);
/* enable D+ pull-down */
isp1301_write_reg(ISP1301_CTRL_REG1_SET, DP_PULLDOWN);
/* turn on Vbus */
isp1301_write_reg(ISP1301_CTRL_REG1_SET, VBUS_DRV);
} else {
/* D+ pull up, D- pull down */
isp1301_write_reg(ISP1301_CTRL_REG1_SET,
(DP_PULLUP | DM_PULLDOWN));
/* disable D- pull up, disable D+ pull down */
isp1301_write_reg(ISP1301_CTRL_REG1_CLR,
(DM_PULLUP | DP_PULLDOWN));
}
}
/*
* Enable or disable the D+ pullup.
*/
static void isp1301_pullup(int on)
{
pr_debug("%s(%d)\n", __func__, on);
if (on)
isp1301_write_reg(ISP1301_CTRL_REG1_SET, DP_PULLUP);
else
isp1301_write_reg(ISP1301_CTRL_REG1_CLR, DP_PULLUP);
}
static struct fsl_xcvr_ops isp1301_ops_otg = {
.name = "isp1301",
.xcvr_type = PORTSC_PTS_SERIAL,
.init = isp1301_init,
.uninit = isp1301_uninit,
.set_host = isp1301_set_serial_host,
.set_device = isp1301_set_serial_dev,
.set_vbus_power = isp1301_set_vbus_power,
.pullup = isp1301_pullup,
};
extern void fsl_usb_xcvr_register(struct fsl_xcvr_ops *xcvr_ops);
static int __init isp1301xc_init(void)
{
pr_debug("%s\n", __FUNCTION__);
fsl_usb_xcvr_register(&isp1301_ops_otg);
return 0;
}
extern void fsl_usb_xcvr_unregister(struct fsl_xcvr_ops *xcvr_ops);
static void __exit isp1301xc_exit(void)
{
fsl_usb_xcvr_unregister(&isp1301_ops_otg);
}
subsys_initcall(isp1301xc_init);
module_exit(isp1301xc_exit);
MODULE_AUTHOR("Freescale Semiconductor, Inc.");
MODULE_DESCRIPTION("isp1301");
MODULE_LICENSE("GPL");
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