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/* Copyright 2019 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.
*
* PS8818 retimer.
*/
#include "chipset.h"
#include "common.h"
#include "console.h"
#include "gpio.h"
#include "i2c.h"
#include "ioexpander.h"
#include "ps8818.h"
#include "usb_mux.h"
#define PS8818_DEBUG 0
int ps8818_i2c_read(int port, int page, int offset, int *data)
{
int rv;
rv = i2c_read8(usb_retimers[port].i2c_port,
usb_retimers[port].i2c_addr_flags + page,
offset, data);
if (PS8818_DEBUG)
ccprintf("%s(%d:0x%02X, 0x%02X) => 0x%02X\n", __func__,
usb_retimers[port].i2c_port,
usb_retimers[port].i2c_addr_flags + page,
offset, *data);
return rv;
}
int ps8818_i2c_write(int port, int page, int offset, int data)
{
if (PS8818_DEBUG)
ccprintf("%s(%d:0x%02X, 0x%02X, 0x%02X)\n", __func__,
usb_retimers[port].i2c_port,
usb_retimers[port].i2c_addr_flags + page,
offset, data);
return i2c_write8(usb_retimers[port].i2c_port,
usb_retimers[port].i2c_addr_flags + page,
offset, data);
}
int ps8818_detect(int port)
{
int rv = EC_ERROR_NOT_POWERED;
int val;
/* Detected if we are powered and can read the device */
if (!chipset_in_state(CHIPSET_STATE_HARD_OFF))
rv = ps8818_i2c_read(port,
PS8818_REG_PAGE0,
PS8818_REG0_FLIP,
&val);
return rv;
}
static int ps8818_set_mux(int port, mux_state_t mux_state)
{
int rv;
int val = 0;
if (chipset_in_state(CHIPSET_STATE_HARD_OFF))
return (mux_state == USB_PD_MUX_NONE) ? EC_SUCCESS
: EC_ERROR_NOT_POWERED;
if (PS8818_DEBUG)
ccprintf("%s(%d, 0x%02X) %s %s %s\n",
__func__, port, mux_state,
(mux_state & USB_PD_MUX_USB_ENABLED) ? "USB" : "",
(mux_state & USB_PD_MUX_DP_ENABLED) ? "DP" : "",
(mux_state & USB_PD_MUX_POLARITY_INVERTED)
? "FLIP" : "");
/* Set the mode */
if (mux_state & USB_PD_MUX_USB_ENABLED)
val |= PS8818_MODE_USB_ENABLE;
if (mux_state & USB_PD_MUX_DP_ENABLED)
val |= PS8818_MODE_DP_ENABLE;
rv = ps8818_i2c_write(port,
PS8818_REG_PAGE0,
PS8818_REG0_MODE,
val);
if (rv)
return rv;
/* Set the flip */
val = 0;
if (mux_state & USB_PD_MUX_POLARITY_INVERTED)
val |= PS8818_FLIP_CONFIG;
rv = ps8818_i2c_write(port,
PS8818_REG_PAGE0,
PS8818_REG0_FLIP,
val);
if (rv)
return rv;
/* Set the IN_HPD */
val = PS8818_DPHPD_CONFIG_INHPD_DISABLE;
if (mux_state & USB_PD_MUX_DP_ENABLED)
val |= PS8818_DPHPD_PLUGGED;
rv = ps8818_i2c_write(port,
PS8818_REG_PAGE0,
PS8818_REG0_DPHPD_CONFIG,
val);
if (rv)
return rv;
/* Board specific retimer mux tuning */
if (usb_retimers[port].tune) {
rv = usb_retimers[port].tune(port, mux_state);
if (rv)
return rv;
}
if (PS8818_DEBUG) {
int tx_status;
int rx_status;
rv = ps8818_i2c_read(port,
PS8818_REG_PAGE2,
PS8818_REG2_TX_STATUS,
&tx_status);
if (rv)
return rv;
rv = ps8818_i2c_read(port,
PS8818_REG_PAGE2,
PS8818_REG2_RX_STATUS,
&rx_status);
if (rv)
return rv;
ccprintf("%s: tx:channel %snormal %s10Gbps\n",
__func__,
(tx_status & PS8818_STATUS_NORMAL_OPERATION)
? "" : "NOT-",
(tx_status & PS8818_STATUS_10_GBPS) ? "" : "NON-");
ccprintf("%s: rx:channel %snormal %s10Gbps\n",
__func__,
(rx_status & PS8818_STATUS_NORMAL_OPERATION)
? "" : "NOT-",
(rx_status & PS8818_STATUS_10_GBPS) ? "" : "NON-");
}
return rv;
}
const struct usb_retimer_driver ps8818_usb_retimer = {
.set = ps8818_set_mux,
};
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