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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.
*
* Driver for Intel Burnside Bridge - Thunderbolt/USB/DisplayPort Retimer
*/
#include "driver/retimer/bb_retimer.h"
#include "chipset.h"
#include "common.h"
#include "console.h"
#include "gpio.h"
#include "hooks.h"
#include "i2c.h"
#include "task.h"
#include "timer.h"
#include "usb_pd.h"
#include "util.h"
#define BB_RETIMER_REG_SIZE 4
#define BB_RETIMER_READ_SIZE (BB_RETIMER_REG_SIZE + 1)
#define BB_RETIMER_WRITE_SIZE (BB_RETIMER_REG_SIZE + 2)
#define BB_RETIMER_MUX_DATA_PRESENT \
(USB_PD_MUX_USB_ENABLED | USB_PD_MUX_DP_ENABLED | \
USB_PD_MUX_SAFE_MODE | USB_PD_MUX_TBT_COMPAT_ENABLED | \
USB_PD_MUX_USB4_ENABLED)
#define BB_RETIMER_MUX_USB_ALT_MODE \
(USB_PD_MUX_USB_ENABLED | USB_PD_MUX_DP_ENABLED | \
USB_PD_MUX_TBT_COMPAT_ENABLED | USB_PD_MUX_USB4_ENABLED)
#define BB_RETIMER_MUX_USB_DP_MODE \
(USB_PD_MUX_USB_ENABLED | USB_PD_MUX_DP_ENABLED | \
USB_PD_MUX_USB4_ENABLED)
#define CPRINTS(format, args...) cprints(CC_USBCHARGE, format, ##args)
#define CPRINTF(format, args...) cprintf(CC_USBCHARGE, format, ##args)
#define BB_RETIMER_I2C_RETRY 5
/*
* Mutex for BB_RETIMER_REG_CONNECTION_STATE register, which can be
* accessed from multiple tasks.
*/
static mutex_t bb_retimer_lock[CONFIG_USB_PD_PORT_MAX_COUNT];
/**
* Utility functions
*/
static int bb_retimer_read(const struct usb_mux *me, const uint8_t offset,
uint32_t *data)
{
int rv, retry = 0;
uint8_t buf[BB_RETIMER_READ_SIZE];
/*
* This I2C message will trigger retimer's internal read sequence
* if its a NAK, sleep and resend same I2C
*/
while (1) {
/*
* Read sequence
* Addr flags (w) - Reg offset - repeated start - Addr flags(r)
* byte[0] : Read size
* byte[1:4] : Data [LSB -> MSB]
* Stop
*/
rv = i2c_xfer(me->i2c_port, me->i2c_addr_flags, &offset, 1, buf,
BB_RETIMER_READ_SIZE);
if (rv == EC_SUCCESS)
break;
if (++retry >= BB_RETIMER_I2C_RETRY) {
CPRINTS("C%d: Retimer I2C read err=%d", me->usb_port,
rv);
return rv;
}
msleep(10);
}
if (buf[0] != BB_RETIMER_REG_SIZE)
return EC_ERROR_UNKNOWN;
*data = buf[1] | (buf[2] << 8) | (buf[3] << 16) | (buf[4] << 24);
return EC_SUCCESS;
}
static int bb_retimer_write(const struct usb_mux *me, const uint8_t offset,
uint32_t data)
{
int rv, retry = 0;
uint8_t buf[BB_RETIMER_WRITE_SIZE];
/*
* Write sequence
* Addr flags(w)
* byte[0] : Reg offset
* byte[1] : Write Size
* byte[2:5] : Data [LSB -> MSB]
* stop
*/
buf[0] = offset;
buf[1] = BB_RETIMER_REG_SIZE;
buf[2] = data & 0xFF;
buf[3] = (data >> 8) & 0xFF;
buf[4] = (data >> 16) & 0xFF;
buf[5] = (data >> 24) & 0xFF;
/*
* This I2C message will trigger retimer's internal write sequence
* if its a NAK, sleep and resend same I2C
*/
while (1) {
rv = i2c_xfer(me->i2c_port, me->i2c_addr_flags, buf,
BB_RETIMER_WRITE_SIZE, NULL, 0);
if (rv == EC_SUCCESS)
break;
if (++retry >= BB_RETIMER_I2C_RETRY) {
CPRINTS("C%d: Retimer I2C write err=%d", me->usb_port,
rv);
break;
}
msleep(10);
}
return rv;
}
__overridable int bb_retimer_power_enable(const struct usb_mux *me, bool enable)
{
const struct bb_usb_control *control = &bb_controls[me->usb_port];
/* handle retimer's power domain */
if (enable) {
gpio_set_level(control->usb_ls_en_gpio, 1);
/*
* Tpw, minimum time from VCC to RESET_N de-assertion is 100us.
* For boards that don't provide a load switch control, the
* retimer_init() function ensures power is up before calling
* this function.
*/
msleep(1);
gpio_set_level(control->retimer_rst_gpio, 1);
/*
* Allow 1ms time for the retimer to power up lc_domain
* which powers I2C controller within retimer
*/
msleep(1);
} else {
gpio_set_level(control->retimer_rst_gpio, 0);
msleep(1);
gpio_set_level(control->usb_ls_en_gpio, 0);
}
return EC_SUCCESS;
}
static void retimer_set_state_dfp(int port, mux_state_t mux_state,
uint32_t *set_retimer_con)
{
union tbt_mode_resp_cable cable_resp = {
.raw_value = pd_get_tbt_mode_vdo(port, TCPCI_MSG_SOP_PRIME)
};
union tbt_mode_resp_device dev_resp;
enum idh_ptype cable_type = get_usb_pd_cable_type(port);
/*
* Bit 2: RE_TIMER_DRIVER
* 0 - Re-driver
* 1 - Re-timer
*
* If Alternate mode is USB/DP/USB4, RE_TIMER_DRIVER is
* set according to SOP' VDO2 response Bit 9.
*
*/
if (is_active_cable_element_retimer(port) &&
(mux_state & BB_RETIMER_MUX_USB_DP_MODE))
*set_retimer_con |= BB_RETIMER_RE_TIMER_DRIVER;
/*
* Bit 22: ACTIVE/PASSIVE
* 0 - Passive cable
* 1 - Active cable
*
* If the mode is USB/DP/Thunderbolt_compat/USB4, ACTIVE/PASIVE is
* set according to Discover mode SOP' response.
*/
if ((mux_state & BB_RETIMER_MUX_USB_ALT_MODE) &&
((cable_type == IDH_PTYPE_ACABLE) ||
cable_resp.tbt_active_passive == TBT_CABLE_ACTIVE))
*set_retimer_con |= BB_RETIMER_ACTIVE_PASSIVE;
if (mux_state & USB_PD_MUX_TBT_COMPAT_ENABLED ||
mux_state & USB_PD_MUX_USB4_ENABLED) {
dev_resp.raw_value = pd_get_tbt_mode_vdo(port, TCPCI_MSG_SOP);
/*
* Bit 2: RE_TIMER_DRIVER
* 0 - Re-driver
* 1 - Re-timer
*
* If Alternate mode is Thunderbolt-Compat, RE_TIMER_DRIVER is
* set according to Discover Mode SOP' response,
* Bit 22: Retimer Type.
*/
if (cable_resp.retimer_type == USB_RETIMER)
*set_retimer_con |= BB_RETIMER_RE_TIMER_DRIVER;
/*
* Bit 17: TBT_TYPE
* 0 - Type-C to Type-C Cable
* 1 - Type-C Legacy TBT Adapter
*/
if (dev_resp.tbt_adapter == TBT_ADAPTER_TBT2_LEGACY)
*set_retimer_con |= BB_RETIMER_TBT_TYPE;
/*
* Bit 18: CABLE_TYPE
* 0 - Electrical cable
* 1 - Optical cable
*/
if (cable_resp.tbt_cable == TBT_CABLE_OPTICAL)
*set_retimer_con |= BB_RETIMER_TBT_CABLE_TYPE;
/*
* Bit 19: VPO_DOCK_DETECTED_OR_DP_OVERDRIVE
* 0 - No vPro Dock.No DP Overdrive
* detected
* 1 - vPro Dock or DP Overdrive
* detected
*/
if ((IS_ENABLED(CONFIG_USBC_RETIMER_INTEL_BB_VPRO_CAPABLE) &&
dev_resp.intel_spec_b0 == VENDOR_SPECIFIC_SUPPORTED) ||
dev_resp.vendor_spec_b1 == VENDOR_SPECIFIC_SUPPORTED)
*set_retimer_con |= BB_RETIMER_VPRO_DOCK_DP_OVERDRIVE;
/*
* Bit 20: TBT_ACTIVE_LINK_TRAINING
* 0 - Active with bi-directional LSRX communication
* 1 - Active with uni-directional LSRX communication
* Set to "0" when passive cable plug
*/
if ((cable_type == IDH_PTYPE_ACABLE ||
cable_resp.tbt_active_passive == TBT_CABLE_ACTIVE) &&
cable_resp.lsrx_comm == UNIDIR_LSRX_COMM)
*set_retimer_con |= BB_RETIMER_TBT_ACTIVE_LINK_TRAINING;
/*
* Bit 27-25: USB4/TBT Cable speed
* 000b - No functionality
* 001b - USB3.1 Gen1 Cable
* 010b - 10Gb/s
* 011b - 10Gb/s and 20Gb/s
* 10..11b - Reserved
*/
*set_retimer_con |= BB_RETIMER_USB4_TBT_CABLE_SPEED_SUPPORT(
mux_state & USB_PD_MUX_TBT_COMPAT_ENABLED ?
get_tbt_cable_speed(port) :
get_usb4_cable_speed(port));
/*
* Bits 29-28: TBT_GEN_SUPPORT
* 00b - 3rd generation TBT (10.3125 and 20.625Gb/s)
* 01b - 4th generation TBT (10.00005Gb/s, 10.3125Gb/s,
* 20.0625Gb/s, 20.000Gb/s)
* 10..11b - Reserved
*/
*set_retimer_con |=
BB_RETIMER_TBT_CABLE_GENERATION(cable_resp.tbt_rounded);
}
}
static void retimer_set_state_ufp(int port, mux_state_t mux_state,
uint32_t *set_retimer_con)
{
/*
* Bit 7: USB_DATA_ROLE for the Burnside Bridge side of
* connection.
* 0 - DFP
* 1 - UFP
*/
*set_retimer_con |= BB_RETIMER_USB_DATA_ROLE;
if (!IS_ENABLED(CONFIG_USB_PD_ALT_MODE_UFP))
return;
/* TODO:b/168890624: Set USB4 retimer config for UFP */
if (mux_state & USB_PD_MUX_TBT_COMPAT_ENABLED) {
union tbt_dev_mode_enter_cmd ufp_tbt_enter_mode = {
.raw_value = pd_ufp_get_enter_mode(port)
};
/*
* Bit 2: RE_TIMER_DRIVER
* 0 - Re-driver
* 1 - Re-timer
*
* Set according to TBT3 Enter Mode bit 22.
*/
if (ufp_tbt_enter_mode.retimer_type == USB_RETIMER)
*set_retimer_con |= BB_RETIMER_RE_TIMER_DRIVER;
/*
* Bit 18: CABLE_TYPE
* 0 - Electrical cable
* 1 - Optical cable
*
* Set according to TBT3 Enter Mode bit 21.
*/
if (ufp_tbt_enter_mode.tbt_cable == TBT_CABLE_OPTICAL)
*set_retimer_con |= BB_RETIMER_TBT_CABLE_TYPE;
/*
* Bit 19: VPO_DOCK_DETECTED_OR_DP_OVERDRIVE
* 0 - No vPro Dock.No DP Overdrive
* detected
* 1 - vPro Dock or DP Overdrive
* detected
*
* Set according to TBT3 Enter Mode bit 26 or bit 31
*/
if ((IS_ENABLED(CONFIG_USBC_RETIMER_INTEL_BB_VPRO_CAPABLE) &&
ufp_tbt_enter_mode.intel_spec_b0 ==
VENDOR_SPECIFIC_SUPPORTED) ||
ufp_tbt_enter_mode.vendor_spec_b1 ==
VENDOR_SPECIFIC_SUPPORTED)
*set_retimer_con |= BB_RETIMER_VPRO_DOCK_DP_OVERDRIVE;
/*
* Bit 20: TBT_ACTIVE_LINK_TRAINING
* 0 - Active with bi-directional LSRX communication
* 1 - Active with uni-directional LSRX communication
*
* Set according to TBT3 Enter Mode bit 23
*/
if (ufp_tbt_enter_mode.lsrx_comm == UNIDIR_LSRX_COMM)
*set_retimer_con |= BB_RETIMER_TBT_ACTIVE_LINK_TRAINING;
/*
* Bit 22: ACTIVE/PASSIVE
* 0 - Passive cable
* 1 - Active cable
*
* Set according to TBT3 Enter Mode bit 24
*/
if (ufp_tbt_enter_mode.cable == TBT_ENTER_ACTIVE_CABLE)
*set_retimer_con |= BB_RETIMER_ACTIVE_PASSIVE;
/*
* Bit 27-25: TBT Cable speed
* 000b - No functionality
* 001b - USB3.1 Gen1 Cable
* 010b - 10Gb/s
* 011b - 10Gb/s and 20Gb/s
* 10..11b - Reserved
*
* Set according to TBT3 Enter Mode bit 18:16
*/
*set_retimer_con |= BB_RETIMER_USB4_TBT_CABLE_SPEED_SUPPORT(
ufp_tbt_enter_mode.tbt_cable_speed);
/*
* Bits 29-28: TBT_GEN_SUPPORT
* 00b - 3rd generation TBT (10.3125 and 20.625Gb/s)
* 01b - 4th generation TBT (10.00005Gb/s, 10.3125Gb/s,
* 20.0625Gb/s, 20.000Gb/s)
* 10..11b - Reserved
*
* Set according to TBT3 Enter Mode bit 20:19
*/
*set_retimer_con |= BB_RETIMER_TBT_CABLE_GENERATION(
ufp_tbt_enter_mode.tbt_rounded);
}
}
/**
* Driver interface functions
*/
static int retimer_set_state(const struct usb_mux *me, mux_state_t mux_state,
bool *ack_required)
{
uint32_t set_retimer_con = 0;
uint8_t dp_pin_mode;
int port = me->usb_port;
int rv = 0;
/* This driver does not use host command ACKs */
*ack_required = false;
mutex_lock(&bb_retimer_lock[port]);
/*
* Bit 0: DATA_CONNECTION_PRESENT
* 0 - No connection present
* 1 - Connection present
*/
if (mux_state & BB_RETIMER_MUX_DATA_PRESENT)
set_retimer_con |= BB_RETIMER_DATA_CONNECTION_PRESENT;
/*
* Bit 1: CONNECTION_ORIENTATION
* 0 - Normal
* 1 - reversed
*/
if (mux_state & USB_PD_MUX_POLARITY_INVERTED)
set_retimer_con |= BB_RETIMER_CONNECTION_ORIENTATION;
/*
* Bit 5: USB_3_CONNECTION
* 0 - No USB3.1 Connection
* 1 - USB3.1 connection
*/
if (mux_state & USB_PD_MUX_USB_ENABLED) {
set_retimer_con |= BB_RETIMER_USB_3_CONNECTION;
/*
* Bit 6: USB3_Speed
* 0 – USB3 is limited to Gen1
* 1 – USB3 Gen1/Gen2 supported
*/
if (is_cable_speed_gen2_capable(port))
set_retimer_con |= BB_RETIMER_USB_3_SPEED;
}
if (mux_state & USB_PD_MUX_DP_ENABLED) {
/*
* Bit 11-10: DP_PIN_ASSIGNMENT (ignored if BIT8 = 0)
* 00 – Pin assignments E/E’
* 01 – Pin assignments C/C’/D/D’1,2
* 10, 11 - reserved
*/
dp_pin_mode = get_dp_pin_mode(port);
if (dp_pin_mode == MODE_DP_PIN_C ||
dp_pin_mode == MODE_DP_PIN_D)
set_retimer_con |= BB_RETIMER_DP_PIN_ASSIGNMENT;
/*
* Bit 14: IRQ_HPD (ignored if BIT8 = 0)
* 0 - No IRQ_HPD
* 1 - IRQ_HPD received
*/
if (mux_state & USB_PD_MUX_HPD_IRQ)
set_retimer_con |= BB_RETIMER_IRQ_HPD;
/*
* Bit 15: HPD_LVL (ignored if BIT8 = 0)
* 0 - HPD_State Low
* 1 - HPD_State High
*/
if (mux_state & USB_PD_MUX_HPD_LVL)
set_retimer_con |= BB_RETIMER_HPD_LVL;
}
/*
* Bit 16: TBT_CONNECTION
* 0 - TBT not configured
* 1 - TBT configured
*/
if (mux_state & USB_PD_MUX_TBT_COMPAT_ENABLED)
set_retimer_con |= BB_RETIMER_TBT_CONNECTION;
/*
* Bit 23: USB4_CONNECTION
* 0 - USB4 not configured
* 1 - USB4 Configured
*/
if (mux_state & USB_PD_MUX_USB4_ENABLED)
set_retimer_con |= BB_RETIMER_USB4_ENABLED;
if (pd_get_data_role(port) == PD_ROLE_DFP)
retimer_set_state_dfp(port, mux_state, &set_retimer_con);
else
retimer_set_state_ufp(port, mux_state, &set_retimer_con);
/* Writing the register4 */
rv = bb_retimer_write(me, BB_RETIMER_REG_CONNECTION_STATE,
set_retimer_con);
mutex_unlock(&bb_retimer_lock[port]);
return rv;
}
void bb_retimer_hpd_update(const struct usb_mux *me, mux_state_t mux_state,
bool *ack_required)
{
uint32_t retimer_con_reg = 0;
int port = me->usb_port;
/* This driver does not use host command ACKs */
*ack_required = false;
mutex_lock(&bb_retimer_lock[port]);
if (bb_retimer_read(me, BB_RETIMER_REG_CONNECTION_STATE,
&retimer_con_reg) != EC_SUCCESS) {
mutex_unlock(&bb_retimer_lock[port]);
return;
}
/*
* Bit 14: IRQ_HPD (ignored if BIT8 = 0)
* 0 - No IRQ_HPD
* 1 - IRQ_HPD received
*/
if (mux_state & USB_PD_MUX_HPD_IRQ)
retimer_con_reg |= BB_RETIMER_IRQ_HPD;
else
retimer_con_reg &= ~BB_RETIMER_IRQ_HPD;
/*
* Bit 8: DP_CONNECTION
* 0 - No DP connection
* 1 - DP connected
*
* Bit 15: HPD_LVL (ignored if BIT8 = 0)
* 0 - HPD_State Low
* 1 - HPD_State High
*
* HDMI card connect to chromebook the DP_CONNECTION bit
* would be enable.
* It will increase BBR power consumption, so enable the DP bit
* only when the HPD bit is set so that the retimer stays in
* low power mode until the external monitor is connected.
*/
if (mux_state & USB_PD_MUX_HPD_LVL)
retimer_con_reg |=
(BB_RETIMER_HPD_LVL | BB_RETIMER_DP_CONNECTION);
else
retimer_con_reg &=
~(BB_RETIMER_HPD_LVL | BB_RETIMER_DP_CONNECTION);
/* Writing the register4 */
bb_retimer_write(me, BB_RETIMER_REG_CONNECTION_STATE, retimer_con_reg);
mutex_unlock(&bb_retimer_lock[port]);
}
void bb_retimer_set_usb3(const struct usb_mux *me, bool enable)
{
int rv;
uint32_t reg_val = 0;
int port = me->usb_port;
mutex_lock(&bb_retimer_lock[port]);
rv = bb_retimer_read(me, BB_RETIMER_REG_CONNECTION_STATE, ®_val);
if (rv != EC_SUCCESS) {
mutex_unlock(&bb_retimer_lock[port]);
return;
}
/* Bit 5: USB_3_CONNECTION */
WRITE_BIT(reg_val, 5, enable);
rv = bb_retimer_write(me, BB_RETIMER_REG_CONNECTION_STATE, reg_val);
if (rv != EC_SUCCESS) {
mutex_unlock(&bb_retimer_lock[port]);
return;
}
mutex_unlock(&bb_retimer_lock[port]);
}
#ifdef CONFIG_ZEPHYR
static void init_retimer_mutexes(void)
{
int port;
for (port = 0; port < CONFIG_USB_PD_PORT_MAX_COUNT; port++) {
k_mutex_init(&bb_retimer_lock[port]);
}
}
DECLARE_HOOK(HOOK_INIT, init_retimer_mutexes, HOOK_PRIO_FIRST);
#endif
static int retimer_low_power_mode(const struct usb_mux *me)
{
return bb_retimer_power_enable(me, false);
}
static bool is_retimer_fw_update_capable(void)
{
return true;
}
static int retimer_init(const struct usb_mux *me)
{
int rv;
uint32_t data;
/* Burnside Bridge is powered by main AP rail */
if (chipset_in_or_transitioning_to_state(CHIPSET_STATE_ANY_OFF)) {
/* Ensure reset is asserted while chip is not powered */
bb_retimer_power_enable(me, false);
return EC_ERROR_NOT_POWERED;
}
rv = bb_retimer_power_enable(me, true);
if (rv != EC_SUCCESS)
return rv;
rv = bb_retimer_read(me, BB_RETIMER_REG_VENDOR_ID, &data);
/*
* After reset, i2c controller may not be ready, if this fails,
* retry one more time.
* TODO: revisit the delay time after retimer reset.
*/
if (rv != EC_SUCCESS)
rv = bb_retimer_read(me, BB_RETIMER_REG_VENDOR_ID, &data);
if (rv != EC_SUCCESS)
return rv;
CPRINTS("C%d: retimer power enable success", me->usb_port);
#ifdef CONFIG_USBC_RETIMER_INTEL_HB
if (data != BB_RETIMER_DEVICE_ID)
return EC_ERROR_INVAL;
#else
if ((data != BB_RETIMER_VENDOR_ID_1) && data != BB_RETIMER_VENDOR_ID_2)
return EC_ERROR_INVAL;
rv = bb_retimer_read(me, BB_RETIMER_REG_DEVICE_ID, &data);
if (rv != EC_SUCCESS)
return rv;
if (data != BB_RETIMER_DEVICE_ID)
return EC_ERROR_INVAL;
#endif
return EC_SUCCESS;
}
const struct usb_mux_driver bb_usb_retimer = {
.init = retimer_init,
.set = retimer_set_state,
.enter_low_power_mode = retimer_low_power_mode,
.is_retimer_fw_update_capable = is_retimer_fw_update_capable,
};
#ifdef CONFIG_CMD_RETIMER
static int console_command_bb_retimer(int argc, const char **argv)
{
char rw, *e;
int port, reg, data, val = 0;
int rv = EC_SUCCESS;
const struct usb_mux *mux;
if (argc < 4)
return EC_ERROR_PARAM_COUNT;
/* Get port number */
port = strtoi(argv[1], &e, 0);
if (*e || !board_is_usb_pd_port_present(port))
return EC_ERROR_PARAM1;
mux = &usb_muxes[port];
while (mux) {
if (mux->driver == &bb_usb_retimer)
break;
mux = mux->next_mux;
}
if (!mux)
return EC_ERROR_PARAM1;
/* Validate r/w selection */
rw = argv[2][0];
if (rw != 'w' && rw != 'r')
return EC_ERROR_PARAM2;
/* Get register address */
reg = strtoi(argv[3], &e, 0);
if (*e || reg < 0)
return EC_ERROR_PARAM3;
/* Get value to be written */
if (rw == 'w') {
val = strtoi(argv[4], &e, 0);
if (*e || val < 0)
return EC_ERROR_PARAM4;
}
for (; mux != NULL; mux = mux->next_mux) {
if (mux->driver == &bb_usb_retimer) {
if (rw == 'r')
rv = bb_retimer_read(mux, reg, &data);
else {
rv = bb_retimer_write(mux, reg, val);
if (rv == EC_SUCCESS) {
rv = bb_retimer_read(mux, reg, &data);
if (rv == EC_SUCCESS && data != val)
rv = EC_ERROR_UNKNOWN;
}
}
if (rv == EC_SUCCESS)
CPRINTS("Addr 0x%x register %d = 0x%x",
mux->i2c_addr_flags, reg, data);
}
}
return rv;
}
DECLARE_CONSOLE_COMMAND(bb, console_command_bb_retimer,
"<port> <r/w> <reg> | <val>",
"Read or write to BB retimer register");
#endif /* CONFIG_CMD_RETIMER */
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