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/* Copyright 2020 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*
* ON Semiconductor NB7V904M USB Type-C DisplayPort Alt Mode Redriver
*/
#include <stdbool.h>
#include "common.h"
#include "console.h"
#include "ec_commands.h"
#include "i2c.h"
#include "nb7v904m.h"
#include "usb_mux.h"
#define CPRINTS(format, args...) cprints(CC_USB, format, ## args)
#define CPRINTF(format, args...) cprintf(CC_USB, format, ## args)
static int nb7v904m_write(int port, int offset, int data)
{
return i2c_write8(usb_retimers[port].i2c_port,
usb_retimers[port].i2c_addr_flags,
offset, data);
}
static int nb7v904m_read(int port, int offset, int *regval)
{
return i2c_read8(usb_retimers[port].i2c_port,
usb_retimers[port].i2c_addr_flags,
offset, regval);
}
static int set_low_power_mode(int port, bool enable)
{
int regval;
int rv;
rv = nb7v904m_read(port, NB7V904M_REG_GEN_DEV_SETTINGS, ®val);
if (rv)
return rv;
if (enable)
regval |= NB7V904M_CHIP_EN;
else
regval &= ~NB7V904M_CHIP_EN;
return nb7v904m_write(port, NB7V904M_REG_GEN_DEV_SETTINGS, regval);
}
static int nb7v904m_enter_low_power_mode(int port)
{
int rv = set_low_power_mode(port, 1);
if (rv)
CPRINTS("C%d: NB7V904M: Failed to enter low power mode!", port);
return rv;
}
static int nb7v904m_init(int port)
{
int rv = set_low_power_mode(port, 0);
if (rv)
CPRINTS("C%d: NB7V904M: init failed!", port);
return rv;
}
static int nb7v904m_set_mux(int port, mux_state_t mux_state)
{
int rv = EC_SUCCESS;
int regval;
int flipped = !!(mux_state & USB_PD_MUX_POLARITY_INVERTED);
/* Turn off redriver if it's not needed at all. */
if (mux_state == USB_PD_MUX_NONE)
return nb7v904m_enter_low_power_mode(port);
rv = nb7v904m_init(port);
if (rv)
return rv;
/* Clear operation mode field */
rv = nb7v904m_read(port, NB7V904M_REG_GEN_DEV_SETTINGS, ®val);
if (rv) {
CPRINTS("C%d %s: Failed to obtain dev settings!", port,
__func__);
return rv;
}
regval &= ~NB7V904M_OP_MODE_MASK;
if (mux_state & USB_PD_MUX_USB_ENABLED) {
/* USB with DP */
if (mux_state & USB_PD_MUX_DP_ENABLED) {
if (flipped)
regval |= NB7V904M_USB_DP_FLIPPED;
else
regval |= NB7V904M_USB_DP_NORMAL;
} else {
/* USB only */
regval |= NB7V904M_USB_ONLY;
}
} else if (mux_state & USB_PD_MUX_DP_ENABLED) {
/* 4 lanes DP */
regval |= NB7V904M_DP_ONLY;
}
if (mux_state & USB_PD_MUX_DP_ENABLED) {
/* Connect AUX */
rv = nb7v904m_write(port, NB7V904M_REG_AUX_CH_CTRL, flipped ?
NB7V904M_AUX_CH_FLIPPED :
NB7V904M_AUX_CH_NORMAL);
/* Enable all channels for DP */
regval |= NB7V904M_CH_EN_MASK;
} else {
/* Disconnect AUX since it's not being used. */
rv = nb7v904m_write(port, NB7V904M_REG_AUX_CH_CTRL,
NB7V904M_AUX_CH_HI_Z);
/* Disable the unused channels to save power */
regval &= ~NB7V904M_CH_EN_MASK;
if (flipped) {
/* Only enable channels A & B */
regval |= NB7V904M_CH_A_EN | NB7V904M_CH_B_EN;
} else {
/* Only enable channels C & D */
regval |= NB7V904M_CH_C_EN | NB7V904M_CH_D_EN;
}
}
rv |= nb7v904m_write(port, NB7V904M_REG_GEN_DEV_SETTINGS, regval);
if (rv)
CPRINTS("C%d: %s failed!", port, __func__);
return rv;
}
const struct usb_retimer_driver nb7v904m_usb_redriver_drv = {
.enter_low_power_mode = &nb7v904m_enter_low_power_mode,
.init = &nb7v904m_init,
.set = &nb7v904m_set_mux,
};
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