[PATCH v6 1/6] usb: tcpm: add core framework
Anand Moon
linux.amoon at gmail.com
Thu Sep 19 11:01:21 CEST 2024
Hi Sebastian,
On Thu, 5 Sept 2024 at 21:06, Sebastian Reichel
<sebastian.reichel at collabora.com> wrote:
>
> This adds TCPM framework in preparation for fusb302 support, which can
> handle USB power delivery messages. This is needed to solve issues with
> devices, that are running from a USB-C port supporting USB-PD, but not
> having a battery.
>
> Such a device currently boots to the kernel without interacting with
> the power-supply at all. If there are no USB-PD message replies within
> 5 seconds, the power-supply assumes the peripheral is not capable of
> USB-PD. It usually takes more than 5 seconds for the system to reach
> the kernel and probe the I2C based fusb302 chip driver. Thus the
> system always runs into this state. The power-supply's solution to
> fix this error state is a hard reset, which involves removing the
> power from VBUS. Boards without a battery (or huge capacitors) will
> reset at this point resulting in a boot loop.
>
> This imports the TCPM framework from the kernel. The porting has
> originally been done by Rockchip using hardware timers and the Linux
> kernel's TCPM code from some years ago.
>
> I had a look at upgrading to the latest TCPM kernel code, but that
> beast became a lot more complex due to adding more USB-C features.
> I believe these features are not needed in U-Boot and with multiple
> kthreads and hrtimers being involved it is non-trivial to port them.
> Instead I worked on stripping down features from the Rockchip port
> to an even more basic level. Also the TCPM code has been reworked
> to avoid complete use of any timers (Rockchip used SoC specific
> hardware timers + IRQ to implement delayed work mechanism). Instead
> the delayed state changes are handled directly from the poll loop.
>
> Note, that (in contrast to the original Rockchip port) the state
> machine has the same hard reset quirk, that the kernel has - i.e.
> it avoids disabling the CC pin resistors for devices that are not
> self-powered. Without that quirk, the Radxa Rock 5B will not just
> end up doing a machine reset when a hard reset is triggered, but will
> not even recover, because the CPU will loose power and the FUSB302
> will keep this state because of leak voltage arriving through the RX
> serial pin (assuming a serial adapter is connected).
>
> This also includes a 'tcpm' command, which can be used to get
> information about the current state and the negotiated voltage
> and current.
>
> Co-developed-by: Wang Jie <dave.wang at rock-chips.com>
> Signed-off-by: Wang Jie <dave.wang at rock-chips.com>
> Tested-by: Soeren Moch <smoch at web.de>
> Signed-off-by: Sebastian Reichel <sebastian.reichel at collabora.com>
For the whole series.
Tested-by: Anand Moon <linux.amoon at gmail.com>
> ---
> Makefile | 1 +
> cmd/Kconfig | 7 +
> cmd/Makefile | 1 +
> cmd/tcpm.c | 136 ++
> doc/usage/cmd/tcpm.rst | 66 +
> doc/usage/index.rst | 1 +
> drivers/usb/Kconfig | 2 +
> drivers/usb/tcpm/Kconfig | 8 +
> drivers/usb/tcpm/Makefile | 3 +
> drivers/usb/tcpm/tcpm-internal.h | 173 +++
> drivers/usb/tcpm/tcpm-uclass.c | 149 ++
> drivers/usb/tcpm/tcpm.c | 2288 ++++++++++++++++++++++++++++++
> include/dm/uclass-id.h | 1 +
> include/usb/pd.h | 516 +++++++
> include/usb/tcpm.h | 99 ++
> 15 files changed, 3451 insertions(+)
> create mode 100644 cmd/tcpm.c
> create mode 100644 doc/usage/cmd/tcpm.rst
> create mode 100644 drivers/usb/tcpm/Kconfig
> create mode 100644 drivers/usb/tcpm/Makefile
> create mode 100644 drivers/usb/tcpm/tcpm-internal.h
> create mode 100644 drivers/usb/tcpm/tcpm-uclass.c
> create mode 100644 drivers/usb/tcpm/tcpm.c
> create mode 100644 include/usb/pd.h
> create mode 100644 include/usb/tcpm.h
>
> diff --git a/Makefile b/Makefile
> index 74df5d177c1f..5a581199c170 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -879,6 +879,7 @@ libs-y += drivers/usb/musb/
> libs-y += drivers/usb/musb-new/
> libs-y += drivers/usb/isp1760/
> libs-y += drivers/usb/phy/
> +libs-y += drivers/usb/tcpm/
> libs-y += drivers/usb/ulpi/
> ifdef CONFIG_POST
> libs-y += post/
> diff --git a/cmd/Kconfig b/cmd/Kconfig
> index 978f44eda426..7710bee22ace 100644
> --- a/cmd/Kconfig
> +++ b/cmd/Kconfig
> @@ -221,6 +221,13 @@ config CMD_REGINFO
> help
> Register dump
>
> +config CMD_TCPM
> + bool "tcpm"
> + depends on TYPEC_TCPM
> + help
> + Show voltage and current negotiated via USB PD as well as the
> + current state of the Type C Port Manager (TCPM) state machine.
> +
> config CMD_TLV_EEPROM
> bool "tlv_eeprom"
> depends on I2C_EEPROM
> diff --git a/cmd/Makefile b/cmd/Makefile
> index 87133cc27a8a..bd0b23ef1013 100644
> --- a/cmd/Makefile
> +++ b/cmd/Makefile
> @@ -172,6 +172,7 @@ obj-$(CONFIG_CMD_SMBIOS) += smbios.o
> obj-$(CONFIG_CMD_SMC) += smccc.o
> obj-$(CONFIG_CMD_SYSBOOT) += sysboot.o
> obj-$(CONFIG_CMD_STACKPROTECTOR_TEST) += stackprot_test.o
> +obj-$(CONFIG_CMD_TCPM) += tcpm.o
> obj-$(CONFIG_CMD_TEMPERATURE) += temperature.o
> obj-$(CONFIG_CMD_TERMINAL) += terminal.o
> obj-$(CONFIG_CMD_TIME) += time.o
> diff --git a/cmd/tcpm.c b/cmd/tcpm.c
> new file mode 100644
> index 000000000000..962cd234a869
> --- /dev/null
> +++ b/cmd/tcpm.c
> @@ -0,0 +1,136 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * (C) Copyright 2024 Collabora
> + */
> +
> +#include <command.h>
> +#include <errno.h>
> +#include <dm.h>
> +#include <dm/uclass-internal.h>
> +#include <usb/tcpm.h>
> +
> +#define LIMIT_DEV 32
> +#define LIMIT_PARENT 20
> +
> +static struct udevice *currdev;
> +
> +static int do_dev(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
> +{
> + char *name;
> + int ret = -ENODEV;
> +
> + switch (argc) {
> + case 2:
> + name = argv[1];
> + ret = tcpm_get(name, &currdev);
> + if (ret) {
> + log_err("Can't get TCPM %s: %d (%s)!\n", name, ret, errno_str(ret));
> + return CMD_RET_FAILURE;
> + }
> + case 1:
> + if (!currdev) {
> + log_err("TCPM device is not set!\n\n");
> + return CMD_RET_USAGE;
> + }
> +
> + printf("dev: %d @ %s\n", dev_seq(currdev), currdev->name);
> + }
> +
> + return CMD_RET_SUCCESS;
> +}
> +
> +static int do_list(struct cmd_tbl *cmdtp, int flag, int argc,
> + char *const argv[])
> +{
> + struct udevice *dev;
> + int ret, err = 0;
> +
> + printf("| %-*.*s| %-*.*s| %s @ %s\n",
> + LIMIT_DEV, LIMIT_DEV, "Name",
> + LIMIT_PARENT, LIMIT_PARENT, "Parent name",
> + "Parent uclass", "seq");
> +
> + for (ret = uclass_first_device_check(UCLASS_TCPM, &dev); dev;
> + ret = uclass_next_device_check(&dev)) {
> + if (ret)
> + err = ret;
> +
> + printf("| %-*.*s| %-*.*s| %s @ %d | status: %i\n",
> + LIMIT_DEV, LIMIT_DEV, dev->name,
> + LIMIT_PARENT, LIMIT_PARENT, dev->parent->name,
> + dev_get_uclass_name(dev->parent), dev_seq(dev->parent),
> + ret);
> + }
> +
> + if (err)
> + return CMD_RET_FAILURE;
> +
> + return CMD_RET_SUCCESS;
> +}
> +
> +int do_print_info(struct udevice *dev)
> +{
> + enum typec_orientation orientation = tcpm_get_orientation(dev);
> + const char *state = tcpm_get_state(dev);
> + int pd_rev = tcpm_get_pd_rev(dev);
> + int mv = tcpm_get_voltage(dev);
> + int ma = tcpm_get_current(dev);
> + enum typec_role pwr_role = tcpm_get_pwr_role(dev);
> + enum typec_data_role data_role = tcpm_get_data_role(dev);
> + bool connected = tcpm_is_connected(dev);
> +
> + if (!connected) {
> + printf("TCPM State: %s\n", state);
> + return 0;
> + }
> +
> + printf("Orientation: %s\n", typec_orientation_name[orientation]);
> + printf("PD Revision: %s\n", typec_pd_rev_name[pd_rev]);
> + printf("Power Role: %s\n", typec_role_name[pwr_role]);
> + printf("Data Role: %s\n", typec_data_role_name[data_role]);
> + printf("Voltage: %2d.%03d V\n", mv / 1000, mv % 1000);
> + printf("Current: %2d.%03d A\n", ma / 1000, ma % 1000);
> +
> + return 0;
> +}
> +
> +static int do_info(struct cmd_tbl *cmdtp, int flag, int argc,
> + char *const argv[])
> +{
> + if (!currdev) {
> + printf("First, set the TCPM device!\n");
> + return CMD_RET_USAGE;
> + }
> +
> + return do_print_info(currdev);
> +}
> +
> +static struct cmd_tbl subcmd[] = {
> + U_BOOT_CMD_MKENT(dev, 2, 1, do_dev, "", ""),
> + U_BOOT_CMD_MKENT(list, 1, 1, do_list, "", ""),
> + U_BOOT_CMD_MKENT(info, 1, 1, do_info, "", ""),
> +};
> +
> +static int do_tcpm(struct cmd_tbl *cmdtp, int flag, int argc,
> + char *const argv[])
> +{
> + struct cmd_tbl *cmd;
> +
> + argc--;
> + argv++;
> +
> + cmd = find_cmd_tbl(argv[0], subcmd, ARRAY_SIZE(subcmd));
> + if (!cmd || argc > cmd->maxargs)
> + return CMD_RET_USAGE;
> +
> + return cmd->cmd(cmdtp, flag, argc, argv);
> +}
> +
> + /**************************************************/
> +
> +U_BOOT_CMD(tcpm, CONFIG_SYS_MAXARGS, 1, do_tcpm,
> + "TCPM sub-system",
> + "list - list TCPM devices\n"
> + "tcpm dev [name] - show or [set] operating TCPM device\n"
> + "tcpm info - dump information\n"
> +);
> diff --git a/doc/usage/cmd/tcpm.rst b/doc/usage/cmd/tcpm.rst
> new file mode 100644
> index 000000000000..1e8199c0f89c
> --- /dev/null
> +++ b/doc/usage/cmd/tcpm.rst
> @@ -0,0 +1,66 @@
> +.. SPDX-License-Identifier: GPL-2.0+:
> +
> +.. index::
> + single: tcpm (command)
> +
> +tcpm command
> +============
> +
> +Synopsis
> +--------
> +
> +::
> +
> + tcpm dev [devname]
> + tcpm info
> + tcpm list
> +
> +Description
> +-----------
> +
> +The tcpm command is used to control USB-PD controllers, also known as TypeC Port Manager (TCPM).
> +
> +The 'tcpm dev' command shows or set current TCPM device.
> +
> + devname
> + device name to change
> +
> +The 'tcpm info' command displays the current state of the device
> +
> +The 'tcpm list' command displays the list available devices.
> +
> +Examples
> +--------
> +
> +The 'tcpm info' command displays device's status:
> +::
> +
> + => tcpm info
> + Orientation: normal
> + PD Revision: rev3
> + Power Role: sink
> + Data Role: device
> + Voltage: 20.000 V
> + Current: 2.250 A
> +
> +The current device can be shown or set via 'tcpm dev' command:
> +::
> +
> + => tcpm dev
> + TCPM device is not set!
> + => tcpm dev usb-typec at 22
> + dev: 0 @ usb-typec at 22
> + => tcpm dev
> + dev: 0 @ usb-typec at 22
> +
> +The list of available devices can be shown via 'tcpm list' command:
> +::
> +
> + => tcpm list
> + | Name | Parent name | Parent uclass @ seq
> + | usb-typec at 22 | i2c at feac0000 | i2c @ 4 | status: 0
> +
> +Configuration
> +-------------
> +
> +The tcpm command is only available if CONFIG_CMD_TCPM=y.
> diff --git a/doc/usage/index.rst b/doc/usage/index.rst
> index 6a218c46b4e4..b4be42f59119 100644
> --- a/doc/usage/index.rst
> +++ b/doc/usage/index.rst
> @@ -111,6 +111,7 @@ Shell commands
> cmd/smbios
> cmd/sound
> cmd/source
> + cmd/tcpm
> cmd/temperature
> cmd/tftpput
> cmd/trace
> diff --git a/drivers/usb/Kconfig b/drivers/usb/Kconfig
> index a972d87c7ad4..985d3a9ef7e6 100644
> --- a/drivers/usb/Kconfig
> +++ b/drivers/usb/Kconfig
> @@ -85,6 +85,8 @@ source "drivers/usb/emul/Kconfig"
>
> source "drivers/usb/phy/Kconfig"
>
> +source "drivers/usb/tcpm/Kconfig"
> +
> source "drivers/usb/ulpi/Kconfig"
>
> if USB_HOST
> diff --git a/drivers/usb/tcpm/Kconfig b/drivers/usb/tcpm/Kconfig
> new file mode 100644
> index 000000000000..55bf8e202b90
> --- /dev/null
> +++ b/drivers/usb/tcpm/Kconfig
> @@ -0,0 +1,8 @@
> +# SPDX-License-Identifier: GPL-2.0
> +
> +config TYPEC_TCPM
> + tristate "USB Type-C Port Controller Manager"
> + depends on DM
> + help
> + The Type-C Port Controller Manager provides a USB PD and USB Type-C
> + state machine for use with Type-C Port Controllers.
> diff --git a/drivers/usb/tcpm/Makefile b/drivers/usb/tcpm/Makefile
> new file mode 100644
> index 000000000000..a0f76436f3fd
> --- /dev/null
> +++ b/drivers/usb/tcpm/Makefile
> @@ -0,0 +1,3 @@
> +# SPDX-License-Identifier: GPL-2.0
> +
> +obj-$(CONFIG_TYPEC_TCPM) += tcpm.o tcpm-uclass.o
> diff --git a/drivers/usb/tcpm/tcpm-internal.h b/drivers/usb/tcpm/tcpm-internal.h
> new file mode 100644
> index 000000000000..561442090027
> --- /dev/null
> +++ b/drivers/usb/tcpm/tcpm-internal.h
> @@ -0,0 +1,173 @@
> +/* SPDX-License-Identifier: GPL-2.0-or-later */
> +/*
> + * Copyright 2015-2017 Google, Inc
> + * Copyright 2024 Collabora
> + */
> +
> +#ifndef __LINUX_USB_TCPM_INTERNAL_H
> +#define __LINUX_USB_TCPM_INTERNAL_H
> +
> +#define FOREACH_TCPM_STATE(S) \
> + S(INVALID_STATE), \
> + S(TOGGLING), \
> + S(SRC_UNATTACHED), \
> + S(SRC_ATTACH_WAIT), \
> + S(SRC_ATTACHED), \
> + S(SRC_STARTUP), \
> + S(SRC_SEND_CAPABILITIES), \
> + S(SRC_SEND_CAPABILITIES_TIMEOUT), \
> + S(SRC_NEGOTIATE_CAPABILITIES), \
> + S(SRC_TRANSITION_SUPPLY), \
> + S(SRC_READY), \
> + S(SRC_WAIT_NEW_CAPABILITIES), \
> + \
> + S(SNK_UNATTACHED), \
> + S(SNK_ATTACH_WAIT), \
> + S(SNK_DEBOUNCED), \
> + S(SNK_ATTACHED), \
> + S(SNK_STARTUP), \
> + S(SNK_DISCOVERY), \
> + S(SNK_DISCOVERY_DEBOUNCE), \
> + S(SNK_DISCOVERY_DEBOUNCE_DONE), \
> + S(SNK_WAIT_CAPABILITIES), \
> + S(SNK_NEGOTIATE_CAPABILITIES), \
> + S(SNK_TRANSITION_SINK), \
> + S(SNK_TRANSITION_SINK_VBUS), \
> + S(SNK_READY), \
> + \
> + S(HARD_RESET_SEND), \
> + S(HARD_RESET_START), \
> + S(SRC_HARD_RESET_VBUS_OFF), \
> + S(SRC_HARD_RESET_VBUS_ON), \
> + S(SNK_HARD_RESET_SINK_OFF), \
> + S(SNK_HARD_RESET_WAIT_VBUS), \
> + S(SNK_HARD_RESET_SINK_ON), \
> + \
> + S(SOFT_RESET), \
> + S(SOFT_RESET_SEND), \
> + \
> + S(DR_SWAP_ACCEPT), \
> + S(DR_SWAP_CHANGE_DR), \
> + \
> + S(ERROR_RECOVERY), \
> + S(PORT_RESET), \
> + S(PORT_RESET_WAIT_OFF)
> +
> +#define GENERATE_TCPM_ENUM(e) e
> +#define GENERATE_TCPM_STRING(s) #s
> +#define TCPM_POLL_EVENT_TIME_OUT 2000
> +
> +enum tcpm_state {
> + FOREACH_TCPM_STATE(GENERATE_TCPM_ENUM)
> +};
> +
> +enum pd_msg_request {
> + PD_MSG_NONE = 0,
> + PD_MSG_CTRL_REJECT,
> + PD_MSG_CTRL_WAIT,
> + PD_MSG_CTRL_NOT_SUPP,
> + PD_MSG_DATA_SINK_CAP,
> + PD_MSG_DATA_SOURCE_CAP,
> +};
> +
> +struct tcpm_port {
> + enum typec_port_type typec_type;
> + int typec_prefer_role;
> +
> + enum typec_role vconn_role;
> + enum typec_role pwr_role;
> + enum typec_data_role data_role;
> +
> + struct typec_partner *partner;
> +
> + enum typec_cc_status cc_req;
> + enum typec_cc_status cc1;
> + enum typec_cc_status cc2;
> + enum typec_cc_polarity polarity;
> +
> + bool attached;
> + bool connected;
> + int poll_event_cnt;
> + enum typec_port_type port_type;
> +
> + /*
> + * Set to true when vbus is greater than VSAFE5V min.
> + * Set to false when vbus falls below vSinkDisconnect max threshold.
> + */
> + bool vbus_present;
> +
> + /*
> + * Set to true when vbus is less than VSAFE0V max.
> + * Set to false when vbus is greater than VSAFE0V max.
> + */
> + bool vbus_vsafe0v;
> +
> + bool vbus_never_low;
> + bool vbus_source;
> + bool vbus_charge;
> +
> + int try_role;
> +
> + enum pd_msg_request queued_message;
> +
> + enum tcpm_state enter_state;
> + enum tcpm_state prev_state;
> + enum tcpm_state state;
> + enum tcpm_state delayed_state;
> + unsigned long delay_ms;
> +
> + bool state_machine_running;
> +
> + bool tx_complete;
> + enum tcpm_transmit_status tx_status;
> +
> + unsigned int negotiated_rev;
> + unsigned int message_id;
> + unsigned int caps_count;
> + unsigned int hard_reset_count;
> + bool pd_capable;
> + bool explicit_contract;
> + unsigned int rx_msgid;
> +
> + /* Partner capabilities/requests */
> + u32 sink_request;
> + u32 source_caps[PDO_MAX_OBJECTS];
> + unsigned int nr_source_caps;
> + u32 sink_caps[PDO_MAX_OBJECTS];
> + unsigned int nr_sink_caps;
> +
> + /*
> + * whether to wait for the Type-C device to send the DR_SWAP Message flag
> + * For Type-C device with Dual-Role Power and Dual-Role Data, the port side
> + * is used as sink + ufp, then the tcpm framework needs to wait for Type-C
> + * device to initiate DR_swap Message.
> + */
> + bool wait_dr_swap_message;
> +
> + /* Local capabilities */
> + u32 src_pdo[PDO_MAX_OBJECTS];
> + unsigned int nr_src_pdo;
> + u32 snk_pdo[PDO_MAX_OBJECTS];
> + unsigned int nr_snk_pdo;
> +
> + unsigned int operating_snk_mw;
> + bool update_sink_caps;
> +
> + /* Requested current / voltage to the port partner */
> + u32 req_current_limit;
> + u32 req_supply_voltage;
> + /* Actual current / voltage limit of the local port */
> + u32 current_limit;
> + u32 supply_voltage;
> +
> + /* port belongs to a self powered device */
> + bool self_powered;
> +
> + unsigned long delay_target;
> +};
> +
> +extern const char * const tcpm_states[];
> +
> +int tcpm_post_probe(struct udevice *dev);
> +
> +#endif
> diff --git a/drivers/usb/tcpm/tcpm-uclass.c b/drivers/usb/tcpm/tcpm-uclass.c
> new file mode 100644
> index 000000000000..92f9eff1ada6
> --- /dev/null
> +++ b/drivers/usb/tcpm/tcpm-uclass.c
> @@ -0,0 +1,149 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * Copyright 2024 Collabora Ltd.
> + *
> + * USB Power Delivery protocol stack.
> + */
> +
> +#include <dm/device.h>
> +#include <dm/device_compat.h>
> +#include <dm/uclass.h>
> +#include <linux/err.h>
> +#include <usb/tcpm.h>
> +#include "tcpm-internal.h"
> +
> +int tcpm_get_voltage(struct udevice *dev)
> +{
> + struct tcpm_port *port = dev_get_uclass_plat(dev);
> +
> + return port->supply_voltage;
> +}
> +
> +int tcpm_get_current(struct udevice *dev)
> +{
> + struct tcpm_port *port = dev_get_uclass_plat(dev);
> +
> + return port->current_limit;
> +}
> +
> +enum typec_orientation tcpm_get_orientation(struct udevice *dev)
> +{
> + struct tcpm_port *port = dev_get_uclass_plat(dev);
> +
> + switch (port->polarity) {
> + case TYPEC_POLARITY_CC1:
> + return TYPEC_ORIENTATION_NORMAL;
> + case TYPEC_POLARITY_CC2:
> + return TYPEC_ORIENTATION_REVERSE;
> + default:
> + return TYPEC_ORIENTATION_NONE;
> + }
> +}
> +
> +const char *tcpm_get_state(struct udevice *dev)
> +{
> + struct tcpm_port *port = dev_get_uclass_plat(dev);
> +
> + return tcpm_states[port->state];
> +}
> +
> +int tcpm_get_pd_rev(struct udevice *dev)
> +{
> + struct tcpm_port *port = dev_get_uclass_plat(dev);
> +
> + return port->negotiated_rev;
> +}
> +
> +enum typec_role tcpm_get_pwr_role(struct udevice *dev)
> +{
> + struct tcpm_port *port = dev_get_uclass_plat(dev);
> +
> + return port->pwr_role;
> +}
> +
> +enum typec_data_role tcpm_get_data_role(struct udevice *dev)
> +{
> + struct tcpm_port *port = dev_get_uclass_plat(dev);
> +
> + return port->data_role;
> +}
> +
> +bool tcpm_is_connected(struct udevice *dev)
> +{
> + struct tcpm_port *port = dev_get_uclass_plat(dev);
> +
> + return port->connected;
> +}
> +
> +int tcpm_get(const char *name, struct udevice **devp)
> +{
> + return uclass_get_device_by_name(UCLASS_TCPM, name, devp);
> +}
> +
> +static int tcpm_post_bind(struct udevice *dev)
> +{
> + const struct dm_tcpm_ops *drvops = dev_get_driver_ops(dev);
> + const char *cap_str;
> + ofnode node;
> + int ret;
> +
> + /*
> + * USB Power Delivery (USB PD) specification requires, that communication
> + * with a sink happens within roughly 5 seconds. Otherwise the source
> + * might assume that the sink does not support USB PD. Starting to do
> + * USB PD communication after that results in a hard reset, which briefly
> + * removes any power from the USB-C port.
> + *
> + * On systems with alternative power supplies this is not an issue, but
> + * systems, which get soleley powered through their USB-C port will end
> + * up losing their power supply and doing a board level reset. The hard
> + * reset will also restart the 5 second timeout. That means a operating
> + * system initializing USB PD will put the system into a boot loop when
> + * it takes more than 5 seconds from cold boot to the operating system
> + * starting to transmit USB PD messages.
> + *
> + * The issue can be avoided by doing the initial USB PD communication
> + * in U-Boot. The operating system can then re-negotiate by doing a
> + * soft reset, which does not trigger removal of the supply voltage.
> + *
> + * Since the TCPM state machine is quite complex and depending on the
> + * remote side can take quite some time to finish, this tries to limit
> + * the automatic probing to systems probably relying on power being
> + * provided by the USB-C port(s):
> + *
> + * 1. self-powered devices won't reset when the USB-C port looses power
> + * 2. if the power is allowed to go into anything else than sink mode
> + * it is not the only power source
> + */
> + ret = drvops->get_connector_node(dev, &node);
> + if (ret)
> + return ret;
> +
> + if (ofnode_read_bool(node, "self-powered"))
> + return 0;
> +
> + cap_str = ofnode_read_string(node, "power-role");
> + if (!cap_str)
> + return -EINVAL;
> +
> + if (strcmp("sink", cap_str))
> + return 0;
> +
> + /* Do not auto-probe PD controller when PD is disabled */
> + if (ofnode_read_bool(node, "pd-disable"))
> + return 0;
> +
> + dev_info(dev, "probing Type-C port manager...");
> +
> + dev_or_flags(dev, DM_FLAG_PROBE_AFTER_BIND);
> +
> + return 0;
> +}
> +
> +UCLASS_DRIVER(tcpm) = {
> + .id = UCLASS_TCPM,
> + .name = "tcpm",
> + .per_device_plat_auto = sizeof(struct tcpm_port),
> + .post_bind = tcpm_post_bind,
> + .post_probe = tcpm_post_probe,
> +};
> diff --git a/drivers/usb/tcpm/tcpm.c b/drivers/usb/tcpm/tcpm.c
> new file mode 100644
> index 000000000000..0aee57cb2f4a
> --- /dev/null
> +++ b/drivers/usb/tcpm/tcpm.c
> @@ -0,0 +1,2288 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * Copyright 2015-2017 Google, Inc
> + *
> + * USB Power Delivery protocol stack.
> + */
> +
> +#include <asm/gpio.h>
> +#include <asm/io.h>
> +#include <dm.h>
> +#include <dm/device_compat.h>
> +#include <dm/device-internal.h>
> +#include <dm/devres.h>
> +#include <linux/compat.h>
> +#include <linux/delay.h>
> +#include <linux/err.h>
> +#include <linux/iopoll.h>
> +#include <time.h>
> +#include <usb/tcpm.h>
> +#include "tcpm-internal.h"
> +
> +DECLARE_GLOBAL_DATA_PTR;
> +
> +const char * const tcpm_states[] = {
> + FOREACH_TCPM_STATE(GENERATE_TCPM_STRING)
> +};
> +
> +const char * const typec_pd_rev_name[] = {
> + [PD_REV10] = "rev1",
> + [PD_REV20] = "rev2",
> + [PD_REV30] = "rev3",
> +};
> +
> +const char * const typec_role_name[] = {
> + [TYPEC_SINK] = "sink",
> + [TYPEC_SOURCE] = "source",
> +};
> +
> +const char * const typec_data_role_name[] = {
> + [TYPEC_DEVICE] = "device",
> + [TYPEC_HOST] = "host",
> +};
> +
> +const char * const typec_orientation_name[] = {
> + [TYPEC_ORIENTATION_NONE] = "none",
> + [TYPEC_ORIENTATION_NORMAL] = "normal",
> + [TYPEC_ORIENTATION_REVERSE] = "reverse",
> +};
> +
> +const char * const typec_cc_status_name[] = {
> + [TYPEC_CC_OPEN] = "open",
> + [TYPEC_CC_RA] = "ra",
> + [TYPEC_CC_RD] = "rd",
> + [TYPEC_CC_RP_DEF] = "rp-def",
> + [TYPEC_CC_RP_1_5] = "rp-1.5",
> + [TYPEC_CC_RP_3_0] = "rp-3.0",
> +};
> +
> +static inline bool tcpm_cc_is_sink(enum typec_cc_status cc)
> +{
> + return cc == TYPEC_CC_RP_DEF ||
> + cc == TYPEC_CC_RP_1_5 ||
> + cc == TYPEC_CC_RP_3_0;
> +}
> +
> +static inline bool tcpm_port_is_sink(struct tcpm_port *port)
> +{
> + bool cc1_is_snk = tcpm_cc_is_sink(port->cc1);
> + bool cc2_is_snk = tcpm_cc_is_sink(port->cc2);
> +
> + return (cc1_is_snk && !cc2_is_snk) ||
> + (cc2_is_snk && !cc1_is_snk);
> +}
> +
> +static inline bool tcpm_cc_is_source(enum typec_cc_status cc)
> +{
> + return cc == TYPEC_CC_RD;
> +}
> +
> +static inline bool tcpm_port_is_source(struct tcpm_port *port)
> +{
> + bool cc1_is_src = tcpm_cc_is_source(port->cc1);
> + bool cc2_is_src = tcpm_cc_is_source(port->cc2);
> +
> + return (cc1_is_src && !cc2_is_src) ||
> + (cc2_is_src && !cc1_is_src);
> +}
> +
> +static inline bool tcpm_try_src(struct tcpm_port *port)
> +{
> + return port->try_role == TYPEC_SOURCE &&
> + port->port_type == TYPEC_PORT_DRP;
> +}
> +
> +static inline void tcpm_reset_event_cnt(struct udevice *dev)
> +{
> + struct tcpm_port *port = dev_get_uclass_plat(dev);
> +
> + port->poll_event_cnt = 0;
> +}
> +
> +static enum tcpm_state tcpm_default_state(struct tcpm_port *port)
> +{
> + if (port->port_type == TYPEC_PORT_DRP) {
> + if (port->try_role == TYPEC_SINK)
> + return SNK_UNATTACHED;
> + else if (port->try_role == TYPEC_SOURCE)
> + return SRC_UNATTACHED;
> + } else if (port->port_type == TYPEC_PORT_SNK) {
> + return SNK_UNATTACHED;
> + }
> + return SRC_UNATTACHED;
> +}
> +
> +static bool tcpm_port_is_disconnected(struct tcpm_port *port)
> +{
> + return (!port->attached && port->cc1 == TYPEC_CC_OPEN &&
> + port->cc2 == TYPEC_CC_OPEN) ||
> + (port->attached && ((port->polarity == TYPEC_POLARITY_CC1 &&
> + port->cc1 == TYPEC_CC_OPEN) ||
> + (port->polarity == TYPEC_POLARITY_CC2 &&
> + port->cc2 == TYPEC_CC_OPEN)));
> +}
> +
> +static void tcpm_set_cc(struct udevice *dev, enum typec_cc_status cc)
> +{
> + const struct dm_tcpm_ops *drvops = dev_get_driver_ops(dev);
> + struct tcpm_port *port = dev_get_uclass_plat(dev);
> +
> + dev_dbg(dev, "TCPM: set cc = %d\n", cc);
> + port->cc_req = cc;
> + drvops->set_cc(dev, cc);
> +}
> +
> +/*
> + * Determine RP value to set based on maximum current supported
> + * by a port if configured as source.
> + * Returns CC value to report to link partner.
> + */
> +static enum typec_cc_status tcpm_rp_cc(struct tcpm_port *port)
> +{
> + const u32 *src_pdo = port->src_pdo;
> + int nr_pdo = port->nr_src_pdo;
> + int i;
> +
> + /*
> + * Search for first entry with matching voltage.
> + * It should report the maximum supported current.
> + */
> + for (i = 0; i < nr_pdo; i++) {
> + const u32 pdo = src_pdo[i];
> +
> + if (pdo_type(pdo) == PDO_TYPE_FIXED &&
> + pdo_fixed_voltage(pdo) == 5000) {
> + unsigned int curr = pdo_max_current(pdo);
> +
> + if (curr >= 3000)
> + return TYPEC_CC_RP_3_0;
> + else if (curr >= 1500)
> + return TYPEC_CC_RP_1_5;
> + return TYPEC_CC_RP_DEF;
> + }
> + }
> +
> + return TYPEC_CC_RP_DEF;
> +}
> +
> +static void tcpm_check_and_run_delayed_work(struct udevice *dev);
> +
> +static bool tcpm_transmit_helper(struct udevice *dev)
> +{
> + const struct dm_tcpm_ops *drvops = dev_get_driver_ops(dev);
> + struct tcpm_port *port = dev_get_uclass_plat(dev);
> +
> + drvops->poll_event(dev);
> + udelay(500);
> + tcpm_check_and_run_delayed_work(dev);
> + return port->tx_complete;
> +}
> +
> +static int tcpm_pd_transmit(struct udevice *dev,
> + enum tcpm_transmit_type type,
> + const struct pd_message *msg)
> +{
> + const struct dm_tcpm_ops *drvops = dev_get_driver_ops(dev);
> + struct tcpm_port *port = dev_get_uclass_plat(dev);
> + u32 timeout_us = PD_T_TCPC_TX_TIMEOUT * 1000;
> + bool tx_complete;
> + int ret;
> +
> + if (msg)
> + dev_dbg(dev, "TCPM: PD TX, header: %#x\n",
> + le16_to_cpu(msg->header));
> + else
> + dev_dbg(dev, "TCPM: PD TX, type: %#x\n", type);
> +
> + port->tx_complete = false;
> + ret = drvops->pd_transmit(dev, type, msg, port->negotiated_rev);
> + if (ret < 0)
> + return ret;
> +
> + /*
> + * At this point we basically need to block until the TCPM controller
> + * returns successful transmission. Since this is usually done using
> + * the generic interrupt status bits, we poll for any events. That
> + * will clear the interrupt status, so we also need to process any
> + * of the incoming events. This means we will do more processing and
> + * thus let's give everything a bit more time.
> + */
> + timeout_us *= 5;
> + ret = read_poll_timeout(tcpm_transmit_helper, tx_complete,
> + !tx_complete, false, timeout_us, dev);
> + if (ret < 0) {
> + dev_err(dev, "TCPM: PD transmit data failed: %d\n", ret);
> + return ret;
> + }
> +
> + switch (port->tx_status) {
> + case TCPC_TX_SUCCESS:
> + port->message_id = (port->message_id + 1) & PD_HEADER_ID_MASK;
> + break;
> + case TCPC_TX_DISCARDED:
> + ret = -EAGAIN;
> + break;
> + case TCPC_TX_FAILED:
> + default:
> + ret = -EIO;
> + break;
> + }
> +
> + return ret;
> +}
> +
> +void tcpm_pd_transmit_complete(struct udevice *dev,
> + enum tcpm_transmit_status status)
> +{
> + struct tcpm_port *port = dev_get_uclass_plat(dev);
> +
> + dev_dbg(dev, "TCPM: PD TX complete, status: %u\n", status);
> + tcpm_reset_event_cnt(dev);
> + port->tx_status = status;
> + port->tx_complete = true;
> +}
> +
> +static int tcpm_set_polarity(struct udevice *dev,
> + enum typec_cc_polarity polarity)
> +{
> + struct tcpm_port *port = dev_get_uclass_plat(dev);
> + const struct dm_tcpm_ops *drvops = dev_get_driver_ops(dev);
> + int ret;
> +
> + dev_dbg(dev, "TCPM: set polarity = %d\n", polarity);
> +
> + if (drvops->set_polarity) {
> + ret = drvops->set_polarity(dev, polarity);
> + if (ret < 0)
> + return ret;
> + }
> +
> + port->polarity = polarity;
> +
> + return 0;
> +}
> +
> +static int tcpm_set_vconn(struct udevice *dev, bool enable)
> +{
> + const struct dm_tcpm_ops *drvops = dev_get_driver_ops(dev);
> + struct tcpm_port *port = dev_get_uclass_plat(dev);
> + int ret;
> +
> + dev_dbg(dev, "TCPM: set vconn = %d\n", enable);
> +
> + ret = drvops->set_vconn(dev, enable);
> + if (!ret)
> + port->vconn_role = enable ? TYPEC_SOURCE : TYPEC_SINK;
> +
> + return ret;
> +}
> +
> +static inline u32 tcpm_get_current_limit(struct tcpm_port *port)
> +{
> + switch (port->polarity ? port->cc2 : port->cc1) {
> + case TYPEC_CC_RP_1_5:
> + return 1500;
> + case TYPEC_CC_RP_3_0:
> + return 3000;
> + case TYPEC_CC_RP_DEF:
> + default:
> + return 0;
> + }
> +}
> +
> +static int tcpm_set_current_limit(struct udevice *dev, u32 max_ma, u32 mv)
> +{
> + struct tcpm_port *port = dev_get_uclass_plat(dev);
> + int ret = -EOPNOTSUPP;
> +
> + dev_info(dev, "TCPM: set voltage limit = %u mV\n", mv);
> + dev_info(dev, "TCPM: set current limit = %u mA\n", max_ma);
> +
> + port->supply_voltage = mv;
> + port->current_limit = max_ma;
> +
> + return ret;
> +}
> +
> +static int tcpm_set_attached_state(struct udevice *dev, bool attached)
> +{
> + const struct dm_tcpm_ops *drvops = dev_get_driver_ops(dev);
> + struct tcpm_port *port = dev_get_uclass_plat(dev);
> +
> + return drvops->set_roles(dev, attached, port->pwr_role,
> + port->data_role);
> +}
> +
> +static int tcpm_set_roles(struct udevice *dev, bool attached,
> + enum typec_role role, enum typec_data_role data)
> +{
> + const struct dm_tcpm_ops *drvops = dev_get_driver_ops(dev);
> + struct tcpm_port *port = dev_get_uclass_plat(dev);
> + int ret;
> +
> + ret = drvops->set_roles(dev, attached, role, data);
> + if (ret < 0)
> + return ret;
> +
> + port->pwr_role = role;
> + port->data_role = data;
> +
> + return 0;
> +}
> +
> +static int tcpm_pd_send_source_caps(struct udevice *dev)
> +{
> + struct tcpm_port *port = dev_get_uclass_plat(dev);
> + struct pd_message msg;
> + int i;
> +
> + memset(&msg, 0, sizeof(msg));
> +
> + if (!port->nr_src_pdo) {
> + /* No source capabilities defined, sink only */
> + msg.header = PD_HEADER_LE(PD_CTRL_REJECT,
> + port->pwr_role,
> + port->data_role,
> + port->negotiated_rev,
> + port->message_id, 0);
> + } else {
> + msg.header = PD_HEADER_LE(PD_DATA_SOURCE_CAP,
> + port->pwr_role,
> + port->data_role,
> + port->negotiated_rev,
> + port->message_id,
> + port->nr_src_pdo);
> + }
> +
> + for (i = 0; i < port->nr_src_pdo; i++)
> + msg.payload[i] = cpu_to_le32(port->src_pdo[i]);
> +
> + return tcpm_pd_transmit(dev, TCPC_TX_SOP, &msg);
> +}
> +
> +static int tcpm_pd_send_sink_caps(struct udevice *dev)
> +{
> + struct tcpm_port *port = dev_get_uclass_plat(dev);
> + struct pd_message msg;
> + unsigned int i;
> +
> + memset(&msg, 0, sizeof(msg));
> +
> + if (!port->nr_snk_pdo) {
> + /* No sink capabilities defined, source only */
> + msg.header = PD_HEADER_LE(PD_CTRL_REJECT,
> + port->pwr_role,
> + port->data_role,
> + port->negotiated_rev,
> + port->message_id, 0);
> + } else {
> + msg.header = PD_HEADER_LE(PD_DATA_SINK_CAP,
> + port->pwr_role,
> + port->data_role,
> + port->negotiated_rev,
> + port->message_id,
> + port->nr_snk_pdo);
> + }
> +
> + for (i = 0; i < port->nr_snk_pdo; i++)
> + msg.payload[i] = cpu_to_le32(port->snk_pdo[i]);
> +
> + return tcpm_pd_transmit(dev, TCPC_TX_SOP, &msg);
> +}
> +
> +static void tcpm_state_machine(struct udevice *dev);
> +
> +static inline void tcpm_timer_uninit(struct udevice *dev)
> +{
> + struct tcpm_port *port = dev_get_uclass_plat(dev);
> +
> + port->delay_target = 0;
> +}
> +
> +static void tcpm_timer_init(struct udevice *dev, uint32_t ms)
> +{
> + struct tcpm_port *port = dev_get_uclass_plat(dev);
> + unsigned long time_us = ms * 1000;
> +
> + port->delay_target = timer_get_us() + time_us;
> +}
> +
> +static void tcpm_check_and_run_delayed_work(struct udevice *dev)
> +{
> + struct tcpm_port *port = dev_get_uclass_plat(dev);
> +
> + /* no delayed state changes scheduled */
> + if (port->delay_target == 0)
> + return;
> +
> + /* it's not yet time */
> + if (timer_get_us() < port->delay_target)
> + return;
> +
> + tcpm_timer_uninit(dev);
> + tcpm_state_machine(dev);
> +}
> +
> +static void mod_tcpm_delayed_work(struct udevice *dev, unsigned int delay_ms)
> +{
> + if (delay_ms) {
> + tcpm_timer_init(dev, delay_ms);
> + } else {
> + tcpm_timer_uninit(dev);
> + tcpm_state_machine(dev);
> + }
> +}
> +
> +static void tcpm_set_state(struct udevice *dev, enum tcpm_state state,
> + unsigned int delay_ms)
> +{
> + struct tcpm_port *port = dev_get_uclass_plat(dev);
> +
> + if (delay_ms) {
> + dev_dbg(dev, "TCPM: pending state change %s -> %s @ %u ms [%s]\n",
> + tcpm_states[port->state], tcpm_states[state], delay_ms,
> + typec_pd_rev_name[port->negotiated_rev]);
> + port->delayed_state = state;
> + mod_tcpm_delayed_work(dev, delay_ms);
> + port->delay_ms = delay_ms;
> + } else {
> + dev_dbg(dev, "TCPM: state change %s -> %s\n",
> + tcpm_states[port->state], tcpm_states[state]);
> + port->delayed_state = INVALID_STATE;
> + port->prev_state = port->state;
> + port->state = state;
> + /*
> + * Don't re-queue the state machine work item if we're currently
> + * in the state machine and we're immediately changing states.
> + * tcpm_state_machine_work() will continue running the state
> + * machine.
> + */
> + if (!port->state_machine_running)
> + mod_tcpm_delayed_work(dev, 0);
> + }
> +}
> +
> +static void tcpm_set_state_cond(struct udevice *dev, enum tcpm_state state,
> + unsigned int delay_ms)
> +{
> + struct tcpm_port *port = dev_get_uclass_plat(dev);
> +
> + if (port->enter_state == port->state)
> + tcpm_set_state(dev, state, delay_ms);
> + else
> + dev_dbg(dev, "TCPM: skipped %sstate change %s -> %s [%u ms], context state %s [%s]\n",
> + delay_ms ? "delayed " : "",
> + tcpm_states[port->state], tcpm_states[state],
> + delay_ms, tcpm_states[port->enter_state],
> + typec_pd_rev_name[port->negotiated_rev]);
> +}
> +
> +static void tcpm_queue_message(struct udevice *dev,
> + enum pd_msg_request message)
> +{
> + struct tcpm_port *port = dev_get_uclass_plat(dev);
> +
> + port->queued_message = message;
> + mod_tcpm_delayed_work(dev, 0);
> +}
> +
> +enum pdo_err {
> + PDO_NO_ERR,
> + PDO_ERR_NO_VSAFE5V,
> + PDO_ERR_VSAFE5V_NOT_FIRST,
> + PDO_ERR_PDO_TYPE_NOT_IN_ORDER,
> + PDO_ERR_FIXED_NOT_SORTED,
> + PDO_ERR_VARIABLE_BATT_NOT_SORTED,
> + PDO_ERR_DUPE_PDO,
> + PDO_ERR_PPS_APDO_NOT_SORTED,
> + PDO_ERR_DUPE_PPS_APDO,
> +};
> +
> +static const char * const pdo_err_msg[] = {
> + [PDO_ERR_NO_VSAFE5V] =
> + " err: source/sink caps should at least have vSafe5V",
> + [PDO_ERR_VSAFE5V_NOT_FIRST] =
> + " err: vSafe5V Fixed Supply Object Shall always be the first object",
> + [PDO_ERR_PDO_TYPE_NOT_IN_ORDER] =
> + " err: PDOs should be in the following order: Fixed; Battery; Variable",
> + [PDO_ERR_FIXED_NOT_SORTED] =
> + " err: Fixed supply pdos should be in increasing order of their fixed voltage",
> + [PDO_ERR_VARIABLE_BATT_NOT_SORTED] =
> + " err: Variable/Battery supply pdos should be in increasing order of their minimum voltage",
> + [PDO_ERR_DUPE_PDO] =
> + " err: Variable/Batt supply pdos cannot have same min/max voltage",
> + [PDO_ERR_PPS_APDO_NOT_SORTED] =
> + " err: Programmable power supply apdos should be in increasing order of their maximum voltage",
> + [PDO_ERR_DUPE_PPS_APDO] =
> + " err: Programmable power supply apdos cannot have same min/max voltage and max current",
> +};
> +
> +static enum pdo_err tcpm_caps_err(struct udevice *dev, const u32 *pdo,
> + unsigned int nr_pdo)
> +{
> + unsigned int i;
> +
> + /* Should at least contain vSafe5v */
> + if (nr_pdo < 1)
> + return PDO_ERR_NO_VSAFE5V;
> +
> + /* The vSafe5V Fixed Supply Object Shall always be the first object */
> + if (pdo_type(pdo[0]) != PDO_TYPE_FIXED ||
> + pdo_fixed_voltage(pdo[0]) != VSAFE5V)
> + return PDO_ERR_VSAFE5V_NOT_FIRST;
> +
> + for (i = 1; i < nr_pdo; i++) {
> + if (pdo_type(pdo[i]) < pdo_type(pdo[i - 1])) {
> + return PDO_ERR_PDO_TYPE_NOT_IN_ORDER;
> + } else if (pdo_type(pdo[i]) == pdo_type(pdo[i - 1])) {
> + enum pd_pdo_type type = pdo_type(pdo[i]);
> +
> + switch (type) {
> + /*
> + * The remaining Fixed Supply Objects, if
> + * present, shall be sent in voltage order;
> + * lowest to highest.
> + */
> + case PDO_TYPE_FIXED:
> + if (pdo_fixed_voltage(pdo[i]) <=
> + pdo_fixed_voltage(pdo[i - 1]))
> + return PDO_ERR_FIXED_NOT_SORTED;
> + break;
> + /*
> + * The Battery Supply Objects and Variable
> + * supply, if present shall be sent in Minimum
> + * Voltage order; lowest to highest.
> + */
> + case PDO_TYPE_VAR:
> + case PDO_TYPE_BATT:
> + if (pdo_min_voltage(pdo[i]) <
> + pdo_min_voltage(pdo[i - 1]))
> + return PDO_ERR_VARIABLE_BATT_NOT_SORTED;
> + else if ((pdo_min_voltage(pdo[i]) ==
> + pdo_min_voltage(pdo[i - 1])) &&
> + (pdo_max_voltage(pdo[i]) ==
> + pdo_max_voltage(pdo[i - 1])))
> + return PDO_ERR_DUPE_PDO;
> + break;
> + /*
> + * The Programmable Power Supply APDOs, if present,
> + * shall be sent in Maximum Voltage order;
> + * lowest to highest.
> + */
> + case PDO_TYPE_APDO:
> + if (pdo_apdo_type(pdo[i]) != APDO_TYPE_PPS)
> + break;
> +
> + if (pdo_pps_apdo_max_voltage(pdo[i]) <
> + pdo_pps_apdo_max_voltage(pdo[i - 1]))
> + return PDO_ERR_PPS_APDO_NOT_SORTED;
> + else if (pdo_pps_apdo_min_voltage(pdo[i]) ==
> + pdo_pps_apdo_min_voltage(pdo[i - 1]) &&
> + pdo_pps_apdo_max_voltage(pdo[i]) ==
> + pdo_pps_apdo_max_voltage(pdo[i - 1]) &&
> + pdo_pps_apdo_max_current(pdo[i]) ==
> + pdo_pps_apdo_max_current(pdo[i - 1]))
> + return PDO_ERR_DUPE_PPS_APDO;
> + break;
> + default:
> + dev_err(dev, "TCPM: Unknown pdo type\n");
> + }
> + }
> + }
> +
> + return PDO_NO_ERR;
> +}
> +
> +static int tcpm_validate_caps(struct udevice *dev, const u32 *pdo,
> + unsigned int nr_pdo)
> +{
> + enum pdo_err err_index = tcpm_caps_err(dev, pdo, nr_pdo);
> +
> + if (err_index != PDO_NO_ERR) {
> + dev_err(dev, "TCPM:%s\n", pdo_err_msg[err_index]);
> + return -EINVAL;
> + }
> +
> + return 0;
> +}
> +
> +/*
> + * PD (data, control) command handling functions
> + */
> +static inline enum tcpm_state ready_state(struct tcpm_port *port)
> +{
> + if (port->pwr_role == TYPEC_SOURCE)
> + return SRC_READY;
> + else
> + return SNK_READY;
> +}
> +
> +static void tcpm_pd_data_request(struct udevice *dev,
> + const struct pd_message *msg)
> +{
> + enum pd_data_msg_type type = pd_header_type_le(msg->header);
> + struct tcpm_port *port = dev_get_uclass_plat(dev);
> + unsigned int cnt = pd_header_cnt_le(msg->header);
> + unsigned int rev = pd_header_rev_le(msg->header);
> + unsigned int i;
> +
> + switch (type) {
> + case PD_DATA_SOURCE_CAP:
> + for (i = 0; i < cnt; i++)
> + port->source_caps[i] = le32_to_cpu(msg->payload[i]);
> +
> + port->nr_source_caps = cnt;
> +
> + tcpm_validate_caps(dev, port->source_caps,
> + port->nr_source_caps);
> +
> + /*
> + * Adjust revision in subsequent message headers, as required,
> + * to comply with 6.2.1.1.5 of the USB PD 3.0 spec. We don't
> + * support Rev 1.0 so just do nothing in that scenario.
> + */
> + if (rev == PD_REV10)
> + break;
> +
> + if (rev < PD_MAX_REV)
> + port->negotiated_rev = rev;
> +
> + if ((pdo_type(port->source_caps[0]) == PDO_TYPE_FIXED) &&
> + (port->source_caps[0] & PDO_FIXED_DUAL_ROLE) &&
> + (port->source_caps[0] & PDO_FIXED_DATA_SWAP)) {
> + /* Dual role power and data, eg: self-powered Type-C */
> + port->wait_dr_swap_message = true;
> + } else {
> + /* Non-Dual role power, eg: adapter */
> + port->wait_dr_swap_message = false;
> + }
> +
> + /*
> + * This message may be received even if VBUS is not
> + * present. This is quite unexpected; see USB PD
> + * specification, sections 8.3.3.6.3.1 and 8.3.3.6.3.2.
> + * However, at the same time, we must be ready to
> + * receive this message and respond to it 15ms after
> + * receiving PS_RDY during power swap operations, no matter
> + * if VBUS is available or not (USB PD specification,
> + * section 6.5.9.2).
> + * So we need to accept the message either way,
> + * but be prepared to keep waiting for VBUS after it was
> + * handled.
> + */
> + tcpm_set_state(dev, SNK_NEGOTIATE_CAPABILITIES, 0);
> + break;
> + case PD_DATA_REQUEST:
> + /*
> + * Adjust revision in subsequent message headers, as required,
> + * to comply with 6.2.1.1.5 of the USB PD 3.0 spec. We don't
> + * support Rev 1.0 so just reject in that scenario.
> + */
> + if (rev == PD_REV10) {
> + tcpm_queue_message(dev, PD_MSG_CTRL_REJECT);
> + break;
> + }
> +
> + if (rev < PD_MAX_REV)
> + port->negotiated_rev = rev;
> +
> + port->sink_request = le32_to_cpu(msg->payload[0]);
> +
> + tcpm_set_state(dev, SRC_NEGOTIATE_CAPABILITIES, 0);
> + break;
> + case PD_DATA_SINK_CAP:
> + /* We don't do anything with this at the moment... */
> + for (i = 0; i < cnt; i++)
> + port->sink_caps[i] = le32_to_cpu(msg->payload[i]);
> +
> + port->nr_sink_caps = cnt;
> + break;
> + default:
> + break;
> + }
> +}
> +
> +static void tcpm_pd_ctrl_request(struct udevice *dev,
> + const struct pd_message *msg)
> +{
> + enum pd_ctrl_msg_type type = pd_header_type_le(msg->header);
> + struct tcpm_port *port = dev_get_uclass_plat(dev);
> + enum tcpm_state next_state;
> +
> + switch (type) {
> + case PD_CTRL_GOOD_CRC:
> + case PD_CTRL_PING:
> + break;
> + case PD_CTRL_GET_SOURCE_CAP:
> + switch (port->state) {
> + case SRC_READY:
> + case SNK_READY:
> + tcpm_queue_message(dev, PD_MSG_DATA_SOURCE_CAP);
> + break;
> + default:
> + tcpm_queue_message(dev, PD_MSG_CTRL_REJECT);
> + break;
> + }
> + break;
> + case PD_CTRL_GET_SINK_CAP:
> + switch (port->state) {
> + case SRC_READY:
> + case SNK_READY:
> + tcpm_queue_message(dev, PD_MSG_DATA_SINK_CAP);
> + break;
> + default:
> + tcpm_queue_message(dev, PD_MSG_CTRL_REJECT);
> + break;
> + }
> + break;
> + case PD_CTRL_GOTO_MIN:
> + break;
> + case PD_CTRL_PS_RDY:
> + switch (port->state) {
> + case SNK_TRANSITION_SINK:
> + if (port->vbus_present) {
> + tcpm_set_current_limit(dev,
> + port->req_current_limit,
> + port->req_supply_voltage);
> + port->explicit_contract = true;
> + tcpm_set_state(dev, SNK_READY, 0);
> + } else {
> + /*
> + * Seen after power swap. Keep waiting for VBUS
> + * in a transitional state.
> + */
> + tcpm_set_state(dev,
> + SNK_TRANSITION_SINK_VBUS, 0);
> + }
> + break;
> + default:
> + break;
> + }
> + break;
> + case PD_CTRL_REJECT:
> + case PD_CTRL_WAIT:
> + case PD_CTRL_NOT_SUPP:
> + switch (port->state) {
> + case SNK_NEGOTIATE_CAPABILITIES:
> + /* USB PD specification, Figure 8-43 */
> + if (port->explicit_contract)
> + next_state = SNK_READY;
> + else
> + next_state = SNK_WAIT_CAPABILITIES;
> +
> + tcpm_set_state(dev, next_state, 0);
> + break;
> + default:
> + break;
> + }
> + break;
> + case PD_CTRL_ACCEPT:
> + switch (port->state) {
> + case SNK_NEGOTIATE_CAPABILITIES:
> + tcpm_set_state(dev, SNK_TRANSITION_SINK, 0);
> + break;
> + case SOFT_RESET_SEND:
> + port->message_id = 0;
> + port->rx_msgid = -1;
> + if (port->pwr_role == TYPEC_SOURCE)
> + next_state = SRC_SEND_CAPABILITIES;
> + else
> + next_state = SNK_WAIT_CAPABILITIES;
> + tcpm_set_state(dev, next_state, 0);
> + break;
> + default:
> + break;
> + }
> + break;
> + case PD_CTRL_SOFT_RESET:
> + tcpm_set_state(dev, SOFT_RESET, 0);
> + break;
> + case PD_CTRL_DR_SWAP:
> + if (port->port_type != TYPEC_PORT_DRP) {
> + tcpm_queue_message(dev, PD_MSG_CTRL_REJECT);
> + break;
> + }
> + /*
> + * 6.3.9: If an alternate mode is active, a request to swap
> + * alternate modes shall trigger a port reset.
> + */
> + switch (port->state) {
> + case SRC_READY:
> + case SNK_READY:
> + tcpm_set_state(dev, DR_SWAP_ACCEPT, 0);
> + break;
> + default:
> + tcpm_queue_message(dev, PD_MSG_CTRL_WAIT);
> + break;
> + }
> + break;
> + case PD_CTRL_PR_SWAP:
> + case PD_CTRL_VCONN_SWAP:
> + case PD_CTRL_GET_SOURCE_CAP_EXT:
> + case PD_CTRL_GET_STATUS:
> + case PD_CTRL_FR_SWAP:
> + case PD_CTRL_GET_PPS_STATUS:
> + case PD_CTRL_GET_COUNTRY_CODES:
> + /* Currently not supported */
> + dev_err(dev, "TCPM: Currently not supported type %#x\n", type);
> + tcpm_queue_message(dev, PD_MSG_CTRL_NOT_SUPP);
> + break;
> + default:
> + dev_err(dev, "TCPM: Unrecognized ctrl message type %#x\n", type);
> + break;
> + }
> +}
> +
> +static void tcpm_pd_rx_handler(struct udevice *dev,
> + const struct pd_message *msg)
> +{
> + struct tcpm_port *port = dev_get_uclass_plat(dev);
> + unsigned int cnt = pd_header_cnt_le(msg->header);
> + bool remote_is_host, local_is_host;
> +
> + dev_dbg(dev, "TCPM: PD RX, header: %#x [%d]\n",
> + le16_to_cpu(msg->header), port->attached);
> +
> + if (port->attached) {
> + enum pd_ctrl_msg_type type = pd_header_type_le(msg->header);
> + unsigned int msgid = pd_header_msgid_le(msg->header);
> +
> + /*
> + * USB PD standard, 6.6.1.2:
> + * "... if MessageID value in a received Message is the
> + * same as the stored value, the receiver shall return a
> + * GoodCRC Message with that MessageID value and drop
> + * the Message (this is a retry of an already received
> + * Message). Note: this shall not apply to the Soft_Reset
> + * Message which always has a MessageID value of zero."
> + */
> + if (msgid == port->rx_msgid && type != PD_CTRL_SOFT_RESET)
> + return;
> + port->rx_msgid = msgid;
> +
> + /*
> + * If both ends believe to be DFP/host, we have a data role
> + * mismatch.
> + */
> + remote_is_host = !!(le16_to_cpu(msg->header) & PD_HEADER_DATA_ROLE);
> + local_is_host = port->data_role == TYPEC_HOST;
> + if (remote_is_host == local_is_host) {
> + dev_err(dev, "TCPM: data role mismatch, initiating error recovery\n");
> + tcpm_set_state(dev, ERROR_RECOVERY, 0);
> + } else {
> + if (cnt)
> + tcpm_pd_data_request(dev, msg);
> + else
> + tcpm_pd_ctrl_request(dev, msg);
> + }
> + }
> +}
> +
> +void tcpm_pd_receive(struct udevice *dev, const struct pd_message *msg)
> +{
> + tcpm_reset_event_cnt(dev);
> + tcpm_pd_rx_handler(dev, msg);
> +}
> +
> +static int tcpm_pd_send_control(struct udevice *dev,
> + enum pd_ctrl_msg_type type)
> +{
> + struct tcpm_port *port = dev_get_uclass_plat(dev);
> + struct pd_message msg;
> +
> + memset(&msg, 0, sizeof(msg));
> + msg.header = PD_HEADER_LE(type, port->pwr_role,
> + port->data_role,
> + port->negotiated_rev,
> + port->message_id, 0);
> +
> + return tcpm_pd_transmit(dev, TCPC_TX_SOP, &msg);
> +}
> +
> +/*
> + * Send queued message without affecting state.
> + * Return true if state machine should go back to sleep,
> + * false otherwise.
> + */
> +static bool tcpm_send_queued_message(struct udevice *dev)
> +{
> + struct tcpm_port *port = dev_get_uclass_plat(dev);
> + enum pd_msg_request queued_message;
> + int max_messages = 100;
> +
> + do {
> + queued_message = port->queued_message;
> + port->queued_message = PD_MSG_NONE;
> + max_messages--;
> +
> + switch (queued_message) {
> + case PD_MSG_CTRL_WAIT:
> + tcpm_pd_send_control(dev, PD_CTRL_WAIT);
> + break;
> + case PD_MSG_CTRL_REJECT:
> + tcpm_pd_send_control(dev, PD_CTRL_REJECT);
> + break;
> + case PD_MSG_CTRL_NOT_SUPP:
> + tcpm_pd_send_control(dev, PD_CTRL_NOT_SUPP);
> + break;
> + case PD_MSG_DATA_SINK_CAP:
> + tcpm_pd_send_sink_caps(dev);
> + break;
> + case PD_MSG_DATA_SOURCE_CAP:
> + tcpm_pd_send_source_caps(dev);
> + break;
> + default:
> + break;
> + }
> + } while (max_messages > 0 && port->queued_message != PD_MSG_NONE);
> +
> + if (!max_messages)
> + dev_err(dev, "Aborted sending of too many queued messages\n");
> +
> + return false;
> +}
> +
> +static int tcpm_pd_check_request(struct udevice *dev)
> +{
> + struct tcpm_port *port = dev_get_uclass_plat(dev);
> + u32 pdo, rdo = port->sink_request;
> + unsigned int max, op, pdo_max, index;
> + enum pd_pdo_type type;
> +
> + index = rdo_index(rdo);
> + if (!index || index > port->nr_src_pdo)
> + return -EINVAL;
> +
> + pdo = port->src_pdo[index - 1];
> + type = pdo_type(pdo);
> + switch (type) {
> + case PDO_TYPE_FIXED:
> + case PDO_TYPE_VAR:
> + max = rdo_max_current(rdo);
> + op = rdo_op_current(rdo);
> + pdo_max = pdo_max_current(pdo);
> +
> + if (op > pdo_max)
> + return -EINVAL;
> + if (max > pdo_max && !(rdo & RDO_CAP_MISMATCH))
> + return -EINVAL;
> +
> + if (type == PDO_TYPE_FIXED)
> + dev_dbg(dev, "TCPM: Requested %u mV, %u mA for %u / %u mA\n",
> + pdo_fixed_voltage(pdo), pdo_max, op, max);
> + else
> + dev_dbg(dev, "TCPM: Requested %u -> %u mV, %u mA for %u / %u mA\n",
> + pdo_min_voltage(pdo), pdo_max_voltage(pdo),
> + pdo_max, op, max);
> + break;
> + case PDO_TYPE_BATT:
> + max = rdo_max_power(rdo);
> + op = rdo_op_power(rdo);
> + pdo_max = pdo_max_power(pdo);
> +
> + if (op > pdo_max)
> + return -EINVAL;
> + if (max > pdo_max && !(rdo & RDO_CAP_MISMATCH))
> + return -EINVAL;
> + dev_info(dev, "TCPM: Requested %u -> %u mV, %u mW for %u / %u mW\n",
> + pdo_min_voltage(pdo), pdo_max_voltage(pdo),
> + pdo_max, op, max);
> + break;
> + default:
> + return -EINVAL;
> + }
> +
> + return 0;
> +}
> +
> +#define min_power(x, y) min(pdo_max_power(x), pdo_max_power(y))
> +#define min_current(x, y) min(pdo_max_current(x), pdo_max_current(y))
> +
> +static int tcpm_pd_select_pdo(struct udevice *dev, int *sink_pdo,
> + int *src_pdo)
> +{
> + struct tcpm_port *port = dev_get_uclass_plat(dev);
> + unsigned int i, j, max_src_mv = 0, min_src_mv = 0, max_mw = 0,
> + max_mv = 0, src_mw = 0, src_ma = 0, max_snk_mv = 0,
> + min_snk_mv = 0;
> + int ret = -EINVAL;
> +
> + /*
> + * Select the source PDO providing the most power which has a
> + * matchig sink cap.
> + */
> + for (i = 0; i < port->nr_source_caps; i++) {
> + u32 pdo = port->source_caps[i];
> + enum pd_pdo_type type = pdo_type(pdo);
> +
> + switch (type) {
> + case PDO_TYPE_FIXED:
> + max_src_mv = pdo_fixed_voltage(pdo);
> + min_src_mv = max_src_mv;
> + break;
> + case PDO_TYPE_BATT:
> + case PDO_TYPE_VAR:
> + max_src_mv = pdo_max_voltage(pdo);
> + min_src_mv = pdo_min_voltage(pdo);
> + break;
> + case PDO_TYPE_APDO:
> + continue;
> + default:
> + dev_err(dev, "TCPM: Invalid source PDO type, ignoring\n");
> + continue;
> + }
> +
> + switch (type) {
> + case PDO_TYPE_FIXED:
> + case PDO_TYPE_VAR:
> + src_ma = pdo_max_current(pdo);
> + src_mw = src_ma * min_src_mv / 1000;
> + break;
> + case PDO_TYPE_BATT:
> + src_mw = pdo_max_power(pdo);
> + break;
> + case PDO_TYPE_APDO:
> + continue;
> + default:
> + dev_err(dev, "TCPM: Invalid source PDO type, ignoring\n");
> + continue;
> + }
> +
> + for (j = 0; j < port->nr_snk_pdo; j++) {
> + pdo = port->snk_pdo[j];
> +
> + switch (pdo_type(pdo)) {
> + case PDO_TYPE_FIXED:
> + max_snk_mv = pdo_fixed_voltage(pdo);
> + min_snk_mv = max_snk_mv;
> + break;
> + case PDO_TYPE_BATT:
> + case PDO_TYPE_VAR:
> + max_snk_mv = pdo_max_voltage(pdo);
> + min_snk_mv = pdo_min_voltage(pdo);
> + break;
> + case PDO_TYPE_APDO:
> + continue;
> + default:
> + dev_err(dev, "TCPM: Invalid sink PDO type, ignoring\n");
> + continue;
> + }
> +
> + if (max_src_mv <= max_snk_mv && min_src_mv >= min_snk_mv) {
> + /* Prefer higher voltages if available */
> + if ((src_mw == max_mw && min_src_mv > max_mv) ||
> + src_mw > max_mw) {
> + *src_pdo = i;
> + *sink_pdo = j;
> + max_mw = src_mw;
> + max_mv = min_src_mv;
> + ret = 0;
> + }
> + }
> + }
> + }
> +
> + return ret;
> +}
> +
> +static int tcpm_pd_build_request(struct udevice *dev, u32 *rdo)
> +{
> + struct tcpm_port *port = dev_get_uclass_plat(dev);
> + unsigned int mv, ma, mw, flags;
> + unsigned int max_ma, max_mw;
> + enum pd_pdo_type type;
> + u32 pdo, matching_snk_pdo;
> + int src_pdo_index = 0;
> + int snk_pdo_index = 0;
> + int ret;
> +
> + ret = tcpm_pd_select_pdo(dev, &snk_pdo_index, &src_pdo_index);
> + if (ret < 0)
> + return ret;
> +
> + pdo = port->source_caps[src_pdo_index];
> + matching_snk_pdo = port->snk_pdo[snk_pdo_index];
> + type = pdo_type(pdo);
> +
> + switch (type) {
> + case PDO_TYPE_FIXED:
> + mv = pdo_fixed_voltage(pdo);
> + break;
> + case PDO_TYPE_BATT:
> + case PDO_TYPE_VAR:
> + mv = pdo_min_voltage(pdo);
> + break;
> + default:
> + dev_err(dev, "TCPM: Invalid PDO selected!\n");
> + return -EINVAL;
> + }
> +
> + /* Select maximum available current within the sink pdo's limit */
> + if (type == PDO_TYPE_BATT) {
> + mw = min_power(pdo, matching_snk_pdo);
> + ma = 1000 * mw / mv;
> + } else {
> + ma = min_current(pdo, matching_snk_pdo);
> + mw = ma * mv / 1000;
> + }
> +
> + flags = RDO_USB_COMM | RDO_NO_SUSPEND;
> +
> + /* Set mismatch bit if offered power is less than operating power */
> + max_ma = ma;
> + max_mw = mw;
> + if (mw < port->operating_snk_mw) {
> + flags |= RDO_CAP_MISMATCH;
> + if (type == PDO_TYPE_BATT &&
> + (pdo_max_power(matching_snk_pdo) > pdo_max_power(pdo)))
> + max_mw = pdo_max_power(matching_snk_pdo);
> + else if (pdo_max_current(matching_snk_pdo) >
> + pdo_max_current(pdo))
> + max_ma = pdo_max_current(matching_snk_pdo);
> + }
> +
> + dev_dbg(dev, "TCPM: cc=%d cc1=%d cc2=%d vbus=%d vconn=%s polarity=%d\n",
> + port->cc_req, port->cc1, port->cc2, port->vbus_source,
> + port->vconn_role == TYPEC_SOURCE ? "source" : "sink",
> + port->polarity);
> +
> + if (type == PDO_TYPE_BATT) {
> + *rdo = RDO_BATT(src_pdo_index + 1, mw, max_mw, flags);
> +
> + dev_info(dev, "TCPM: requesting PDO %d: %u mV, %u mW%s\n",
> + src_pdo_index, mv, mw,
> + flags & RDO_CAP_MISMATCH ? " [mismatch]" : "");
> + } else {
> + *rdo = RDO_FIXED(src_pdo_index + 1, ma, max_ma, flags);
> +
> + dev_info(dev, "TCPM: requesting PDO %d: %u mV, %u mA%s\n",
> + src_pdo_index, mv, ma,
> + flags & RDO_CAP_MISMATCH ? " [mismatch]" : "");
> + }
> +
> + port->req_current_limit = ma;
> + port->req_supply_voltage = mv;
> +
> + return 0;
> +}
> +
> +static int tcpm_pd_send_request(struct udevice *dev)
> +{
> + struct tcpm_port *port = dev_get_uclass_plat(dev);
> + struct pd_message msg;
> + int ret;
> + u32 rdo;
> +
> + ret = tcpm_pd_build_request(dev, &rdo);
> + if (ret < 0)
> + return ret;
> +
> + memset(&msg, 0, sizeof(msg));
> + msg.header = PD_HEADER_LE(PD_DATA_REQUEST,
> + port->pwr_role,
> + port->data_role,
> + port->negotiated_rev,
> + port->message_id, 1);
> + msg.payload[0] = cpu_to_le32(rdo);
> +
> + return tcpm_pd_transmit(dev, TCPC_TX_SOP, &msg);
> +}
> +
> +static int tcpm_set_vbus(struct udevice *dev, bool enable)
> +{
> + struct tcpm_port *port = dev_get_uclass_plat(dev);
> + const struct dm_tcpm_ops *drvops = dev_get_driver_ops(dev);
> + int ret;
> +
> + if (enable && port->vbus_charge)
> + return -EINVAL;
> +
> + dev_dbg(dev, "TCPM: set vbus = %d charge = %d\n",
> + enable, port->vbus_charge);
> +
> + ret = drvops->set_vbus(dev, enable, port->vbus_charge);
> + if (ret < 0)
> + return ret;
> +
> + port->vbus_source = enable;
> + return 0;
> +}
> +
> +static int tcpm_set_charge(struct udevice *dev, bool charge)
> +{
> + const struct dm_tcpm_ops *drvops = dev_get_driver_ops(dev);
> + struct tcpm_port *port = dev_get_uclass_plat(dev);
> + int ret;
> +
> + if (charge && port->vbus_source)
> + return -EINVAL;
> +
> + if (charge != port->vbus_charge) {
> + dev_dbg(dev, "TCPM: set vbus = %d charge = %d\n",
> + port->vbus_source, charge);
> + ret = drvops->set_vbus(dev, port->vbus_source,
> + charge);
> + if (ret < 0)
> + return ret;
> + }
> + port->vbus_charge = charge;
> + return 0;
> +}
> +
> +static bool tcpm_start_toggling(struct udevice *dev, enum typec_cc_status cc)
> +{
> + const struct dm_tcpm_ops *drvops = dev_get_driver_ops(dev);
> + struct tcpm_port *port = dev_get_uclass_plat(dev);
> + int ret;
> +
> + if (!drvops->start_toggling)
> + return false;
> +
> + dev_dbg(dev, "TCPM: Start toggling\n");
> + ret = drvops->start_toggling(dev, port->port_type, cc);
> + return ret == 0;
> +}
> +
> +static int tcpm_init_vbus(struct udevice *dev)
> +{
> + const struct dm_tcpm_ops *drvops = dev_get_driver_ops(dev);
> + struct tcpm_port *port = dev_get_uclass_plat(dev);
> + int ret;
> +
> + ret = drvops->set_vbus(dev, false, false);
> + port->vbus_source = false;
> + port->vbus_charge = false;
> + return ret;
> +}
> +
> +static int tcpm_init_vconn(struct udevice *dev)
> +{
> + const struct dm_tcpm_ops *drvops = dev_get_driver_ops(dev);
> + struct tcpm_port *port = dev_get_uclass_plat(dev);
> + int ret;
> +
> + ret = drvops->set_vconn(dev, false);
> + port->vconn_role = TYPEC_SINK;
> + return ret;
> +}
> +
> +static inline void tcpm_typec_connect(struct tcpm_port *port)
> +{
> + if (!port->connected)
> + port->connected = true;
> +}
> +
> +static int tcpm_src_attach(struct udevice *dev)
> +{
> + const struct dm_tcpm_ops *drvops = dev_get_driver_ops(dev);
> + struct tcpm_port *port = dev_get_uclass_plat(dev);
> + enum typec_cc_polarity polarity =
> + port->cc2 == TYPEC_CC_RD ? TYPEC_POLARITY_CC2
> + : TYPEC_POLARITY_CC1;
> + int ret;
> +
> + if (port->attached)
> + return 0;
> +
> + ret = tcpm_set_polarity(dev, polarity);
> + if (ret < 0)
> + return ret;
> +
> + ret = tcpm_set_roles(dev, true, TYPEC_SOURCE, TYPEC_HOST);
> + if (ret < 0)
> + return ret;
> +
> + ret = drvops->set_pd_rx(dev, true);
> + if (ret < 0)
> + goto out_disable_mux;
> +
> + /*
> + * USB Type-C specification, version 1.2,
> + * chapter 4.5.2.2.8.1 (Attached.SRC Requirements)
> + * Enable VCONN only if the non-RD port is set to RA.
> + */
> + if ((polarity == TYPEC_POLARITY_CC1 && port->cc2 == TYPEC_CC_RA) ||
> + (polarity == TYPEC_POLARITY_CC2 && port->cc1 == TYPEC_CC_RA)) {
> + ret = tcpm_set_vconn(dev, true);
> + if (ret < 0)
> + goto out_disable_pd;
> + }
> +
> + ret = tcpm_set_vbus(dev, true);
> + if (ret < 0)
> + goto out_disable_vconn;
> +
> + port->pd_capable = false;
> +
> + port->partner = NULL;
> +
> + port->attached = true;
> +
> + return 0;
> +
> +out_disable_vconn:
> + tcpm_set_vconn(dev, false);
> +out_disable_pd:
> + drvops->set_pd_rx(dev, false);
> +out_disable_mux:
> + dev_err(dev, "TCPM: CC connected in %s as DFP\n",
> + polarity ? "CC2" : "CC1");
> + return 0;
> +}
> +
> +static inline void tcpm_typec_disconnect(struct tcpm_port *port)
> +{
> + if (port->connected) {
> + port->partner = NULL;
> + port->connected = false;
> + }
> +}
> +
> +static void tcpm_reset_port(struct udevice *dev)
> +{
> + const struct dm_tcpm_ops *drvops = dev_get_driver_ops(dev);
> + struct tcpm_port *port = dev_get_uclass_plat(dev);
> +
> + tcpm_timer_uninit(dev);
> + tcpm_typec_disconnect(port);
> + tcpm_reset_event_cnt(dev);
> + port->wait_dr_swap_message = false;
> + port->attached = false;
> + port->pd_capable = false;
> +
> + /*
> + * First Rx ID should be 0; set this to a sentinel of -1 so that
> + * we can check tcpm_pd_rx_handler() if we had seen it before.
> + */
> + port->rx_msgid = -1;
> +
> + drvops->set_pd_rx(dev, false);
> + tcpm_init_vbus(dev); /* also disables charging */
> + tcpm_init_vconn(dev);
> + tcpm_set_current_limit(dev, 0, 0);
> + tcpm_set_polarity(dev, TYPEC_POLARITY_CC1);
> + tcpm_set_attached_state(dev, false);
> + port->nr_sink_caps = 0;
> +}
> +
> +static void tcpm_detach(struct udevice *dev)
> +{
> + struct tcpm_port *port = dev_get_uclass_plat(dev);
> +
> + if (tcpm_port_is_disconnected(port))
> + port->hard_reset_count = 0;
> +
> + if (!port->attached)
> + return;
> +
> + tcpm_reset_port(dev);
> +}
> +
> +static void tcpm_src_detach(struct udevice *dev)
> +{
> + tcpm_detach(dev);
> +}
> +
> +static int tcpm_snk_attach(struct udevice *dev)
> +{
> + struct tcpm_port *port = dev_get_uclass_plat(dev);
> + int ret;
> +
> + if (port->attached)
> + return 0;
> +
> + ret = tcpm_set_polarity(dev, port->cc2 != TYPEC_CC_OPEN ?
> + TYPEC_POLARITY_CC2 : TYPEC_POLARITY_CC1);
> + if (ret < 0)
> + return ret;
> +
> + ret = tcpm_set_roles(dev, true, TYPEC_SINK, TYPEC_DEVICE);
> + if (ret < 0)
> + return ret;
> +
> + port->pd_capable = false;
> +
> + port->partner = NULL;
> +
> + port->attached = true;
> + dev_info(dev, "TCPM: CC connected in %s as UFP\n",
> + port->cc1 != TYPEC_CC_OPEN ? "CC1" : "CC2");
> +
> + return 0;
> +}
> +
> +static void tcpm_snk_detach(struct udevice *dev)
> +{
> + tcpm_detach(dev);
> +}
> +
> +static inline enum tcpm_state hard_reset_state(struct tcpm_port *port)
> +{
> + if (port->hard_reset_count < PD_N_HARD_RESET_COUNT)
> + return HARD_RESET_SEND;
> + if (port->pd_capable)
> + return ERROR_RECOVERY;
> + if (port->pwr_role == TYPEC_SOURCE)
> + return SRC_UNATTACHED;
> + if (port->state == SNK_WAIT_CAPABILITIES)
> + return SNK_READY;
> + return SNK_UNATTACHED;
> +}
> +
> +static inline enum tcpm_state unattached_state(struct tcpm_port *port)
> +{
> + if (port->port_type == TYPEC_PORT_DRP) {
> + if (port->pwr_role == TYPEC_SOURCE)
> + return SRC_UNATTACHED;
> + else
> + return SNK_UNATTACHED;
> + } else if (port->port_type == TYPEC_PORT_SRC) {
> + return SRC_UNATTACHED;
> + }
> +
> + return SNK_UNATTACHED;
> +}
> +
> +static void run_state_machine(struct udevice *dev)
> +{
> + const struct dm_tcpm_ops *drvops = dev_get_driver_ops(dev);
> + struct tcpm_port *port = dev_get_uclass_plat(dev);
> + int ret;
> +
> + port->enter_state = port->state;
> + switch (port->state) {
> + case TOGGLING:
> + break;
> + /* SRC states */
> + case SRC_UNATTACHED:
> + tcpm_src_detach(dev);
> + if (tcpm_start_toggling(dev, tcpm_rp_cc(port))) {
> + tcpm_set_state(dev, TOGGLING, 0);
> + break;
> + }
> + tcpm_set_cc(dev, tcpm_rp_cc(port));
> + if (port->port_type == TYPEC_PORT_DRP)
> + tcpm_set_state(dev, SNK_UNATTACHED, PD_T_DRP_SNK);
> + break;
> + case SRC_ATTACH_WAIT:
> + if (tcpm_port_is_source(port))
> + tcpm_set_state(dev, SRC_ATTACHED, PD_T_CC_DEBOUNCE);
> + break;
> +
> + case SRC_ATTACHED:
> + ret = tcpm_src_attach(dev);
> + /*
> + * Currently, vbus control is not implemented,
> + * and the SRC detection process cannot be fully implemented.
> + */
> + tcpm_set_state(dev, SRC_READY, 0);
> + break;
> + case SRC_STARTUP:
> + port->caps_count = 0;
> + port->negotiated_rev = PD_MAX_REV;
> + port->message_id = 0;
> + port->rx_msgid = -1;
> + port->explicit_contract = false;
> + tcpm_set_state(dev, SRC_SEND_CAPABILITIES, 0);
> + break;
> + case SRC_SEND_CAPABILITIES:
> + port->caps_count++;
> + if (port->caps_count > PD_N_CAPS_COUNT) {
> + tcpm_set_state(dev, SRC_READY, 0);
> + break;
> + }
> + ret = tcpm_pd_send_source_caps(dev);
> + if (ret < 0) {
> + tcpm_set_state(dev, SRC_SEND_CAPABILITIES,
> + PD_T_SEND_SOURCE_CAP);
> + } else {
> + /*
> + * Per standard, we should clear the reset counter here.
> + * However, that can result in state machine hang-ups.
> + * Reset it only in READY state to improve stability.
> + */
> + /* port->hard_reset_count = 0; */
> + port->caps_count = 0;
> + port->pd_capable = true;
> + tcpm_set_state_cond(dev, SRC_SEND_CAPABILITIES_TIMEOUT,
> + PD_T_SEND_SOURCE_CAP);
> + }
> + break;
> + case SRC_SEND_CAPABILITIES_TIMEOUT:
> + /*
> + * Error recovery for a PD_DATA_SOURCE_CAP reply timeout.
> + *
> + * PD 2.0 sinks are supposed to accept src-capabilities with a
> + * 3.0 header and simply ignore any src PDOs which the sink does
> + * not understand such as PPS but some 2.0 sinks instead ignore
> + * the entire PD_DATA_SOURCE_CAP message, causing contract
> + * negotiation to fail.
> + *
> + * After PD_N_HARD_RESET_COUNT hard-reset attempts, we try
> + * sending src-capabilities with a lower PD revision to
> + * make these broken sinks work.
> + */
> + if (port->hard_reset_count < PD_N_HARD_RESET_COUNT) {
> + tcpm_set_state(dev, HARD_RESET_SEND, 0);
> + } else if (port->negotiated_rev > PD_REV20) {
> + port->negotiated_rev--;
> + port->hard_reset_count = 0;
> + tcpm_set_state(dev, SRC_SEND_CAPABILITIES, 0);
> + } else {
> + tcpm_set_state(dev, hard_reset_state(port), 0);
> + }
> + break;
> + case SRC_NEGOTIATE_CAPABILITIES:
> + ret = tcpm_pd_check_request(dev);
> + if (ret < 0) {
> + tcpm_pd_send_control(dev, PD_CTRL_REJECT);
> + if (!port->explicit_contract) {
> + tcpm_set_state(dev,
> + SRC_WAIT_NEW_CAPABILITIES, 0);
> + } else {
> + tcpm_set_state(dev, SRC_READY, 0);
> + }
> + } else {
> + tcpm_pd_send_control(dev, PD_CTRL_ACCEPT);
> + tcpm_set_state(dev, SRC_TRANSITION_SUPPLY,
> + PD_T_SRC_TRANSITION);
> + }
> + break;
> + case SRC_TRANSITION_SUPPLY:
> + /* XXX: regulator_set_voltage(vbus, ...) */
> + tcpm_pd_send_control(dev, PD_CTRL_PS_RDY);
> + port->explicit_contract = true;
> + tcpm_set_state_cond(dev, SRC_READY, 0);
> + break;
> + case SRC_READY:
> + port->hard_reset_count = 0;
> +
> + tcpm_typec_connect(port);
> + break;
> + case SRC_WAIT_NEW_CAPABILITIES:
> + /* Nothing to do... */
> + break;
> +
> + /* SNK states */
> + case SNK_UNATTACHED:
> + tcpm_snk_detach(dev);
> + if (tcpm_start_toggling(dev, TYPEC_CC_RD)) {
> + tcpm_set_state(dev, TOGGLING, 0);
> + break;
> + }
> + tcpm_set_cc(dev, TYPEC_CC_RD);
> + if (port->port_type == TYPEC_PORT_DRP)
> + tcpm_set_state(dev, SRC_UNATTACHED, PD_T_DRP_SRC);
> + break;
> + case SNK_ATTACH_WAIT:
> + if ((port->cc1 == TYPEC_CC_OPEN &&
> + port->cc2 != TYPEC_CC_OPEN) ||
> + (port->cc1 != TYPEC_CC_OPEN &&
> + port->cc2 == TYPEC_CC_OPEN))
> + tcpm_set_state(dev, SNK_DEBOUNCED,
> + PD_T_CC_DEBOUNCE);
> + else if (tcpm_port_is_disconnected(port))
> + tcpm_set_state(dev, SNK_UNATTACHED,
> + PD_T_CC_DEBOUNCE);
> + break;
> + case SNK_DEBOUNCED:
> + if (tcpm_port_is_disconnected(port))
> + tcpm_set_state(dev, SNK_UNATTACHED, PD_T_PD_DEBOUNCE);
> + else if (port->vbus_present)
> + tcpm_set_state(dev, SNK_ATTACHED, 0);
> + else
> + /* Wait for VBUS, but not forever */
> + tcpm_set_state(dev, PORT_RESET, PD_T_PS_SOURCE_ON);
> + break;
> + case SNK_ATTACHED:
> + ret = tcpm_snk_attach(dev);
> + if (ret < 0)
> + tcpm_set_state(dev, SNK_UNATTACHED, 0);
> + else
> + tcpm_set_state(dev, SNK_STARTUP, 0);
> + break;
> + case SNK_STARTUP:
> + port->negotiated_rev = PD_MAX_REV;
> + port->message_id = 0;
> + port->rx_msgid = -1;
> + port->explicit_contract = false;
> + tcpm_set_state(dev, SNK_DISCOVERY, 0);
> + break;
> + case SNK_DISCOVERY:
> + if (port->vbus_present) {
> + tcpm_set_current_limit(dev,
> + tcpm_get_current_limit(port),
> + 5000);
> + tcpm_set_charge(dev, true);
> + tcpm_set_state(dev, SNK_WAIT_CAPABILITIES, 0);
> + break;
> + }
> + /*
> + * For DRP, timeouts differ. Also, handling is supposed to be
> + * different and much more complex (dead battery detection;
> + * see USB power delivery specification, section 8.3.3.6.1.5.1).
> + */
> + tcpm_set_state(dev, hard_reset_state(port),
> + port->port_type == TYPEC_PORT_DRP ?
> + PD_T_DB_DETECT : PD_T_NO_RESPONSE);
> + break;
> + case SNK_DISCOVERY_DEBOUNCE:
> + tcpm_set_state(dev, SNK_DISCOVERY_DEBOUNCE_DONE,
> + PD_T_CC_DEBOUNCE);
> + break;
> + case SNK_DISCOVERY_DEBOUNCE_DONE:
> + tcpm_set_state(dev, unattached_state(port), 0);
> + break;
> + case SNK_WAIT_CAPABILITIES:
> + ret = drvops->set_pd_rx(dev, true);
> + if (ret < 0) {
> + tcpm_set_state(dev, SNK_READY, 0);
> + break;
> + }
> + /*
> + * If VBUS has never been low, and we time out waiting
> + * for source cap, try a soft reset first, in case we
> + * were already in a stable contract before this boot.
> + * Do this only once.
> + */
> + if (port->vbus_never_low) {
> + port->vbus_never_low = false;
> + tcpm_set_state(dev, SOFT_RESET_SEND,
> + PD_T_SINK_WAIT_CAP);
> + } else {
> + tcpm_set_state(dev, hard_reset_state(port),
> + PD_T_SINK_WAIT_CAP);
> + }
> + break;
> + case SNK_NEGOTIATE_CAPABILITIES:
> + port->pd_capable = true;
> + port->hard_reset_count = 0;
> + ret = tcpm_pd_send_request(dev);
> + if (ret < 0) {
> + /* Let the Source send capabilities again. */
> + tcpm_set_state(dev, SNK_WAIT_CAPABILITIES, 0);
> + } else {
> + tcpm_set_state_cond(dev, hard_reset_state(port),
> + PD_T_SENDER_RESPONSE);
> + }
> + break;
> + case SNK_TRANSITION_SINK:
> + case SNK_TRANSITION_SINK_VBUS:
> + tcpm_set_state(dev, hard_reset_state(port),
> + PD_T_PS_TRANSITION);
> + break;
> + case SNK_READY:
> + port->update_sink_caps = false;
> + tcpm_typec_connect(port);
> + /*
> + * Here poll_event_cnt is cleared, waiting for self-powered Type-C devices
> + * to send DR_swap Messge until 1s (TCPM_POLL_EVENT_TIME_OUT * 500us)timeout
> + */
> + if (port->wait_dr_swap_message)
> + tcpm_reset_event_cnt(dev);
> +
> + break;
> +
> + /* Hard_Reset states */
> + case HARD_RESET_SEND:
> + tcpm_pd_transmit(dev, TCPC_TX_HARD_RESET, NULL);
> + tcpm_set_state(dev, HARD_RESET_START, 0);
> + port->wait_dr_swap_message = false;
> + break;
> + case HARD_RESET_START:
> + port->hard_reset_count++;
> + drvops->set_pd_rx(dev, false);
> + port->nr_sink_caps = 0;
> + if (port->pwr_role == TYPEC_SOURCE)
> + tcpm_set_state(dev, SRC_HARD_RESET_VBUS_OFF,
> + PD_T_PS_HARD_RESET);
> + else
> + tcpm_set_state(dev, SNK_HARD_RESET_SINK_OFF, 0);
> + break;
> + case SRC_HARD_RESET_VBUS_OFF:
> + tcpm_set_vconn(dev, true);
> + tcpm_set_vbus(dev, false);
> + tcpm_set_roles(dev, port->self_powered, TYPEC_SOURCE,
> + TYPEC_HOST);
> + tcpm_set_state(dev, SRC_HARD_RESET_VBUS_ON, PD_T_SRC_RECOVER);
> + break;
> + case SRC_HARD_RESET_VBUS_ON:
> + tcpm_set_vconn(dev, true);
> + tcpm_set_vbus(dev, true);
> + drvops->set_pd_rx(dev, true);
> + tcpm_set_attached_state(dev, true);
> + tcpm_set_state(dev, SRC_UNATTACHED, PD_T_PS_SOURCE_ON);
> + break;
> + case SNK_HARD_RESET_SINK_OFF:
> + tcpm_set_vconn(dev, false);
> + if (port->pd_capable)
> + tcpm_set_charge(dev, false);
> + tcpm_set_roles(dev, port->self_powered, TYPEC_SINK,
> + TYPEC_DEVICE);
> + /*
> + * VBUS may or may not toggle, depending on the adapter.
> + * If it doesn't toggle, transition to SNK_HARD_RESET_SINK_ON
> + * directly after timeout.
> + */
> + tcpm_set_state(dev, SNK_HARD_RESET_SINK_ON, PD_T_SAFE_0V);
> + break;
> + case SNK_HARD_RESET_WAIT_VBUS:
> + /* Assume we're disconnected if VBUS doesn't come back. */
> + tcpm_set_state(dev, SNK_UNATTACHED,
> + PD_T_SRC_RECOVER_MAX + PD_T_SRC_TURN_ON);
> + break;
> + case SNK_HARD_RESET_SINK_ON:
> + /* Note: There is no guarantee that VBUS is on in this state */
> + /*
> + * XXX:
> + * The specification suggests that dual mode ports in sink
> + * mode should transition to state PE_SRC_Transition_to_default.
> + * See USB power delivery specification chapter 8.3.3.6.1.3.
> + * This would mean to
> + * - turn off VCONN, reset power supply
> + * - request hardware reset
> + * - turn on VCONN
> + * - Transition to state PE_Src_Startup
> + * SNK only ports shall transition to state Snk_Startup
> + * (see chapter 8.3.3.3.8).
> + * Similar, dual-mode ports in source mode should transition
> + * to PE_SNK_Transition_to_default.
> + */
> + if (port->pd_capable) {
> + tcpm_set_current_limit(dev,
> + tcpm_get_current_limit(port),
> + 5000);
> + tcpm_set_charge(dev, true);
> + }
> + tcpm_set_attached_state(dev, true);
> + tcpm_set_state(dev, SNK_STARTUP, 0);
> + break;
> +
> + /* Soft_Reset states */
> + case SOFT_RESET:
> + port->message_id = 0;
> + port->rx_msgid = -1;
> + tcpm_pd_send_control(dev, PD_CTRL_ACCEPT);
> + if (port->pwr_role == TYPEC_SOURCE)
> + tcpm_set_state(dev, SRC_SEND_CAPABILITIES, 0);
> + else
> + tcpm_set_state(dev, SNK_WAIT_CAPABILITIES, 0);
> + break;
> + case SOFT_RESET_SEND:
> + port->message_id = 0;
> + port->rx_msgid = -1;
> + if (tcpm_pd_send_control(dev, PD_CTRL_SOFT_RESET))
> + tcpm_set_state_cond(dev, hard_reset_state(port), 0);
> + else
> + tcpm_set_state_cond(dev, hard_reset_state(port),
> + PD_T_SENDER_RESPONSE);
> + break;
> +
> + /* DR_Swap states */
> + case DR_SWAP_ACCEPT:
> + tcpm_pd_send_control(dev, PD_CTRL_ACCEPT);
> + tcpm_set_state_cond(dev, DR_SWAP_CHANGE_DR, 0);
> + break;
> + case DR_SWAP_CHANGE_DR:
> + if (port->data_role == TYPEC_HOST) {
> + tcpm_set_roles(dev, true, port->pwr_role,
> + TYPEC_DEVICE);
> + } else {
> + tcpm_set_roles(dev, true, port->pwr_role,
> + TYPEC_HOST);
> + }
> + /* DR_swap process complete, wait_dr_swap_message is cleared */
> + port->wait_dr_swap_message = false;
> + tcpm_set_state(dev, ready_state(port), 0);
> + break;
> + case ERROR_RECOVERY:
> + tcpm_set_state(dev, PORT_RESET, 0);
> + break;
> + case PORT_RESET:
> + tcpm_reset_port(dev);
> + if (port->self_powered)
> + tcpm_set_cc(dev, TYPEC_CC_OPEN);
> + else
> + tcpm_set_cc(dev, tcpm_default_state(port) == SNK_UNATTACHED ?
> + TYPEC_CC_RD : tcpm_rp_cc(port));
> + tcpm_set_state(dev, PORT_RESET_WAIT_OFF,
> + PD_T_ERROR_RECOVERY);
> + break;
> + case PORT_RESET_WAIT_OFF:
> + tcpm_set_state(dev,
> + tcpm_default_state(port),
> + port->vbus_present ? PD_T_PS_SOURCE_OFF : 0);
> + break;
> + default:
> + dev_err(dev, "TCPM: Unexpected port state %d\n", port->state);
> + break;
> + }
> +}
> +
> +static void tcpm_state_machine(struct udevice *dev)
> +{
> + struct tcpm_port *port = dev_get_uclass_plat(dev);
> + enum tcpm_state prev_state;
> +
> + mutex_lock(&port->lock);
> + port->state_machine_running = true;
> +
> + if (port->queued_message && tcpm_send_queued_message(dev))
> + goto done;
> +
> + /* If we were queued due to a delayed state change, update it now */
> + if (port->delayed_state) {
> + dev_dbg(dev, "TCPM: state change %s -> %s [delayed %ld ms]\n",
> + tcpm_states[port->state],
> + tcpm_states[port->delayed_state], port->delay_ms);
> + port->prev_state = port->state;
> + port->state = port->delayed_state;
> + port->delayed_state = INVALID_STATE;
> + }
> +
> + /*
> + * Continue running as long as we have (non-delayed) state changes
> + * to make.
> + */
> + do {
> + prev_state = port->state;
> + run_state_machine(dev);
> + if (port->queued_message)
> + tcpm_send_queued_message(dev);
> + } while (port->state != prev_state && !port->delayed_state);
> +
> +done:
> + port->state_machine_running = false;
> + mutex_unlock(&port->lock);
> +}
> +
> +static void _tcpm_cc_change(struct udevice *dev, enum typec_cc_status cc1,
> + enum typec_cc_status cc2)
> +{
> + struct tcpm_port *port = dev_get_uclass_plat(dev);
> + enum typec_cc_status old_cc1, old_cc2;
> + enum tcpm_state new_state;
> +
> + old_cc1 = port->cc1;
> + old_cc2 = port->cc2;
> + port->cc1 = cc1;
> + port->cc2 = cc2;
> +
> + dev_dbg(dev, "TCPM: CC1: %u -> %u, CC2: %u -> %u [state %s, polarity %d, %s]\n",
> + old_cc1, cc1, old_cc2, cc2, tcpm_states[port->state],
> + port->polarity,
> + tcpm_port_is_disconnected(port) ? "disconnected" : "connected");
> +
> + switch (port->state) {
> + case TOGGLING:
> + if (tcpm_port_is_source(port))
> + tcpm_set_state(dev, SRC_ATTACH_WAIT, 0);
> + else if (tcpm_port_is_sink(port))
> + tcpm_set_state(dev, SNK_ATTACH_WAIT, 0);
> + break;
> + case SRC_UNATTACHED:
> + case SRC_ATTACH_WAIT:
> + if (tcpm_port_is_disconnected(port))
> + tcpm_set_state(dev, SRC_UNATTACHED, 0);
> + else if (cc1 != old_cc1 || cc2 != old_cc2)
> + tcpm_set_state(dev, SRC_ATTACH_WAIT, 0);
> + break;
> + case SRC_ATTACHED:
> + case SRC_SEND_CAPABILITIES:
> + case SRC_READY:
> + if (tcpm_port_is_disconnected(port) ||
> + !tcpm_port_is_source(port))
> + tcpm_set_state(dev, SRC_UNATTACHED, 0);
> + break;
> + case SNK_UNATTACHED:
> + if (tcpm_port_is_sink(port))
> + tcpm_set_state(dev, SNK_ATTACH_WAIT, 0);
> + break;
> + case SNK_ATTACH_WAIT:
> + if ((port->cc1 == TYPEC_CC_OPEN &&
> + port->cc2 != TYPEC_CC_OPEN) ||
> + (port->cc1 != TYPEC_CC_OPEN &&
> + port->cc2 == TYPEC_CC_OPEN))
> + new_state = SNK_DEBOUNCED;
> + else if (tcpm_port_is_disconnected(port))
> + new_state = SNK_UNATTACHED;
> + else
> + break;
> + if (new_state != port->delayed_state)
> + tcpm_set_state(dev, SNK_ATTACH_WAIT, 0);
> + break;
> + case SNK_DEBOUNCED:
> + if (tcpm_port_is_disconnected(port))
> + new_state = SNK_UNATTACHED;
> + else if (port->vbus_present)
> + new_state = tcpm_try_src(port) ? INVALID_STATE : SNK_ATTACHED;
> + else
> + new_state = SNK_UNATTACHED;
> + if (new_state != port->delayed_state)
> + tcpm_set_state(dev, SNK_DEBOUNCED, 0);
> + break;
> + case SNK_READY:
> + if (tcpm_port_is_disconnected(port))
> + tcpm_set_state(dev, unattached_state(port), 0);
> + else if (!port->pd_capable &&
> + (cc1 != old_cc1 || cc2 != old_cc2))
> + tcpm_set_current_limit(dev,
> + tcpm_get_current_limit(port),
> + 5000);
> + break;
> +
> + case SNK_DISCOVERY:
> + /* CC line is unstable, wait for debounce */
> + if (tcpm_port_is_disconnected(port))
> + tcpm_set_state(dev, SNK_DISCOVERY_DEBOUNCE, 0);
> + break;
> + case SNK_DISCOVERY_DEBOUNCE:
> + break;
> +
> + case PORT_RESET:
> + case PORT_RESET_WAIT_OFF:
> + /*
> + * State set back to default mode once the timer completes.
> + * Ignore CC changes here.
> + */
> + break;
> + default:
> + /*
> + * While acting as sink and auto vbus discharge is enabled, Allow disconnect
> + * to be driven by vbus disconnect.
> + */
> + if (tcpm_port_is_disconnected(port))
> + tcpm_set_state(dev, unattached_state(port), 0);
> + break;
> + }
> +}
> +
> +static void _tcpm_pd_vbus_on(struct udevice *dev)
> +{
> + struct tcpm_port *port = dev_get_uclass_plat(dev);
> +
> + dev_dbg(dev, "TCPM: VBUS on event\n");
> + port->vbus_present = true;
> + /*
> + * When vbus_present is true i.e. Voltage at VBUS is greater than VSAFE5V implicitly
> + * states that vbus is not at VSAFE0V, hence clear the vbus_vsafe0v flag here.
> + */
> + port->vbus_vsafe0v = false;
> +
> + switch (port->state) {
> + case SNK_TRANSITION_SINK_VBUS:
> + port->explicit_contract = true;
> + tcpm_set_state(dev, SNK_READY, 0);
> + break;
> + case SNK_DISCOVERY:
> + tcpm_set_state(dev, SNK_DISCOVERY, 0);
> + break;
> + case SNK_DEBOUNCED:
> + tcpm_set_state(dev, SNK_ATTACHED, 0);
> + break;
> + case SNK_HARD_RESET_WAIT_VBUS:
> + tcpm_set_state(dev, SNK_HARD_RESET_SINK_ON, 0);
> + break;
> + case SRC_ATTACHED:
> + tcpm_set_state(dev, SRC_STARTUP, 0);
> + break;
> + case SRC_HARD_RESET_VBUS_ON:
> + tcpm_set_state(dev, SRC_STARTUP, 0);
> + break;
> +
> + case PORT_RESET:
> + case PORT_RESET_WAIT_OFF:
> + /*
> + * State set back to default mode once the timer completes.
> + * Ignore vbus changes here.
> + */
> + break;
> +
> + default:
> + break;
> + }
> +}
> +
> +static void _tcpm_pd_vbus_off(struct udevice *dev)
> +{
> + struct tcpm_port *port = dev_get_uclass_plat(dev);
> +
> + dev_dbg(dev, "TCPM: VBUS off event\n");
> + port->vbus_present = false;
> + port->vbus_never_low = false;
> + switch (port->state) {
> + case SNK_HARD_RESET_SINK_OFF:
> + tcpm_set_state(dev, SNK_HARD_RESET_WAIT_VBUS, 0);
> + break;
> + case HARD_RESET_SEND:
> + break;
> + case SNK_ATTACH_WAIT:
> + tcpm_set_state(dev, SNK_UNATTACHED, 0);
> + break;
> +
> + case SNK_NEGOTIATE_CAPABILITIES:
> + break;
> +
> + case PORT_RESET_WAIT_OFF:
> + tcpm_set_state(dev, tcpm_default_state(port), 0);
> + break;
> +
> + case PORT_RESET:
> + /*
> + * State set back to default mode once the timer completes.
> + * Ignore vbus changes here.
> + */
> + break;
> +
> + default:
> + if (port->pwr_role == TYPEC_SINK && port->attached)
> + tcpm_set_state(dev, SNK_UNATTACHED, 0);
> + break;
> + }
> +}
> +
> +void tcpm_cc_change(struct udevice *dev)
> +{
> + const struct dm_tcpm_ops *drvops = dev_get_driver_ops(dev);
> + enum typec_cc_status cc1, cc2;
> +
> + tcpm_reset_event_cnt(dev);
> + if (drvops->get_cc(dev, &cc1, &cc2) == 0)
> + _tcpm_cc_change(dev, cc1, cc2);
> +}
> +
> +void tcpm_vbus_change(struct udevice *dev)
> +{
> + const struct dm_tcpm_ops *drvops = dev_get_driver_ops(dev);
> + bool vbus;
> +
> + tcpm_reset_event_cnt(dev);
> + vbus = drvops->get_vbus(dev);
> + if (vbus)
> + _tcpm_pd_vbus_on(dev);
> + else
> + _tcpm_pd_vbus_off(dev);
> +}
> +
> +void tcpm_pd_hard_reset(struct udevice *dev)
> +{
> + struct tcpm_port *port = dev_get_uclass_plat(dev);
> +
> + tcpm_reset_event_cnt(dev);
> + dev_dbg(dev, "TCPM: Received hard reset\n");
> +
> + /* If a hard reset message is received during the port reset process,
> + * we should ignore it, that is, do not set port->state to HARD_RESET_START.
> + */
> + if (port->state == PORT_RESET || port->state == PORT_RESET_WAIT_OFF)
> + return;
> +
> + /*
> + * If we keep receiving hard reset requests, executing the hard reset
> + * must have failed. Revert to error recovery if that happens.
> + */
> + tcpm_set_state(dev,
> + port->hard_reset_count < PD_N_HARD_RESET_COUNT ?
> + HARD_RESET_START : ERROR_RECOVERY,
> + 0);
> +}
> +
> +static void tcpm_init(struct udevice *dev)
> +{
> + const struct dm_tcpm_ops *drvops = dev_get_driver_ops(dev);
> + struct tcpm_port *port = dev_get_uclass_plat(dev);
> + enum typec_cc_status cc1, cc2;
> +
> + drvops->init(dev);
> +
> + tcpm_reset_port(dev);
> +
> + /*
> + * XXX
> + * Should possibly wait for VBUS to settle if it was enabled locally
> + * since tcpm_reset_port() will disable VBUS.
> + */
> + port->vbus_present = drvops->get_vbus(dev);
> + if (port->vbus_present)
> + port->vbus_never_low = true;
> +
> + /*
> + * 1. When vbus_present is true, voltage on VBUS is already at VSAFE5V.
> + * So implicitly vbus_vsafe0v = false.
> + *
> + * 2. When vbus_present is false and TCPC does NOT support querying
> + * vsafe0v status, then, it's best to assume vbus is at VSAFE0V i.e.
> + * vbus_vsafe0v is true.
> + *
> + * 3. When vbus_present is false and TCPC does support querying vsafe0v,
> + * then, query tcpc for vsafe0v status.
> + */
> + if (port->vbus_present)
> + port->vbus_vsafe0v = false;
> + else
> + port->vbus_vsafe0v = true;
> +
> + tcpm_set_state(dev, tcpm_default_state(port), 0);
> +
> + if (drvops->get_cc(dev, &cc1, &cc2) == 0)
> + _tcpm_cc_change(dev, cc1, cc2);
> +}
> +
> +static int tcpm_fw_get_caps(struct udevice *dev)
> +{
> + const struct dm_tcpm_ops *drvops = dev_get_driver_ops(dev);
> + struct tcpm_port *port = dev_get_uclass_plat(dev);
> + ofnode node;
> + const char *cap_str;
> + int ret;
> + u32 mw;
> +
> + ret = drvops->get_connector_node(dev, &node);
> + if (ret)
> + return ret;
> +
> + cap_str = ofnode_read_string(node, "power-role");
> + if (!cap_str)
> + return -EINVAL;
> +
> + if (!strcmp("dual", cap_str))
> + port->typec_type = TYPEC_PORT_DRP;
> + else if (!strcmp("source", cap_str))
> + port->typec_type = TYPEC_PORT_SRC;
> + else if (!strcmp("sink", cap_str))
> + port->typec_type = TYPEC_PORT_SNK;
> + else
> + return -EINVAL;
> +
> + port->port_type = port->typec_type;
> +
> + if (port->port_type == TYPEC_PORT_SNK)
> + goto sink;
> +
> + /* Get source pdos */
> + ret = ofnode_read_size(node, "source-pdos") / sizeof(u32);
> + if (ret <= 0)
> + return -EINVAL;
> +
> + port->nr_src_pdo = min(ret, PDO_MAX_OBJECTS);
> + ret = ofnode_read_u32_array(node, "source-pdos",
> + port->src_pdo, port->nr_src_pdo);
> + if (ret || tcpm_validate_caps(dev, port->src_pdo, port->nr_src_pdo))
> + return -EINVAL;
> +
> + if (port->port_type == TYPEC_PORT_SRC)
> + return 0;
> +
> + /* Get the preferred power role for DRP */
> + cap_str = ofnode_read_string(node, "try-power-role");
> + if (!cap_str)
> + return -EINVAL;
> +
> + if (!strcmp("sink", cap_str))
> + port->typec_prefer_role = TYPEC_SINK;
> + else if (!strcmp("source", cap_str))
> + port->typec_prefer_role = TYPEC_SOURCE;
> + else
> + return -EINVAL;
> +
> + if (port->typec_prefer_role < 0)
> + return -EINVAL;
> +sink:
> + /* Get sink pdos */
> + ret = ofnode_read_size(node, "sink-pdos") / sizeof(u32);
> + if (ret <= 0)
> + return -EINVAL;
> +
> + port->nr_snk_pdo = min(ret, PDO_MAX_OBJECTS);
> + ret = ofnode_read_u32_array(node, "sink-pdos",
> + port->snk_pdo, port->nr_snk_pdo);
> + if (ret || tcpm_validate_caps(dev, port->snk_pdo, port->nr_snk_pdo))
> + return -EINVAL;
> +
> + if (ofnode_read_u32_array(node, "op-sink-microwatt", &mw, 1))
> + return -EINVAL;
> + port->operating_snk_mw = mw / 1000;
> +
> + port->self_powered = ofnode_read_bool(node, "self-powered");
> +
> + return 0;
> +}
> +
> +static int tcpm_port_init(struct udevice *dev)
> +{
> + struct tcpm_port *port = dev_get_uclass_plat(dev);
> + int err;
> +
> + err = tcpm_fw_get_caps(dev);
> + if (err < 0) {
> + dev_err(dev, "TCPM: please check the dts config: %d\n", err);
> + return err;
> + }
> +
> + port->try_role = port->typec_prefer_role;
> + port->port_type = port->typec_type;
> +
> + tcpm_init(dev);
> +
> + dev_info(dev, "TCPM: init finished\n");
> +
> + return 0;
> +}
> +
> +static void tcpm_poll_event(struct udevice *dev)
> +{
> + const struct dm_tcpm_ops *drvops = dev_get_driver_ops(dev);
> + struct tcpm_port *port = dev_get_uclass_plat(dev);
> +
> + if (!drvops->get_vbus(dev))
> + return;
> +
> + while (port->poll_event_cnt < TCPM_POLL_EVENT_TIME_OUT) {
> + if (!port->wait_dr_swap_message &&
> + (port->state == SNK_READY || port->state == SRC_READY))
> + break;
> +
> + drvops->poll_event(dev);
> + port->poll_event_cnt++;
> + udelay(500);
> + tcpm_check_and_run_delayed_work(dev);
> + }
> +
> + if (port->state != SNK_READY && port->state != SRC_READY)
> + dev_warn(dev, "TCPM: exit in state %s\n",
> + tcpm_states[port->state]);
> +
> + /*
> + * At this time, call the callback function of the respective pd chip
> + * to enter the low-power mode. In order to reduce the time spent on
> + * the PD chip driver as much as possible, the tcpm framework does not
> + * fully process the communication initiated by the device,so it should
> + * be noted that we can disable the internal oscillator, etc., but do
> + * not turn off the power of the transceiver module, otherwise the
> + * self-powered Type-C device will initiate a Message(eg: self-powered
> + * Type-C hub initiates a SINK capability request(PD_CTRL_GET_SINK_CAP))
> + * and the pd chip cannot reply to GoodCRC, causing the self-powered Type-C
> + * device to switch vbus to vSafe5v, or even turn off vbus.
> + */
> + if (!drvops->enter_low_power_mode)
> + return;
> +
> + if (drvops->enter_low_power_mode(dev, port->attached, port->pd_capable))
> + dev_err(dev, "TCPM: failed to enter low power\n");
> + else
> + dev_info(dev, "TCPM: PD chip enter low power mode\n");
> +}
> +
> +int tcpm_post_probe(struct udevice *dev)
> +{
> + int ret = tcpm_port_init(dev);
> +
> + if (ret < 0) {
> + dev_err(dev, "failed to tcpm port init\n");
> + return ret;
> + }
> +
> + tcpm_poll_event(dev);
> +
> + return 0;
> +}
> diff --git a/include/dm/uclass-id.h b/include/dm/uclass-id.h
> index 5271e646bb16..270088ad94f7 100644
> --- a/include/dm/uclass-id.h
> +++ b/include/dm/uclass-id.h
> @@ -139,6 +139,7 @@ enum uclass_id {
> UCLASS_SYSCON, /* System configuration device */
> UCLASS_SYSINFO, /* Device information from hardware */
> UCLASS_SYSRESET, /* System reset device */
> + UCLASS_TCPM, /* TypeC port manager */
> UCLASS_TEE, /* Trusted Execution Environment device */
> UCLASS_THERMAL, /* Thermal sensor */
> UCLASS_TIMER, /* Timer device */
> diff --git a/include/usb/pd.h b/include/usb/pd.h
> new file mode 100644
> index 000000000000..cacda322d7c6
> --- /dev/null
> +++ b/include/usb/pd.h
> @@ -0,0 +1,516 @@
> +/* SPDX-License-Identifier: GPL-2.0-or-later */
> +/*
> + * Copyright 2015-2017 Google, Inc
> + */
> +
> +#ifndef __LINUX_USB_PD_H
> +#define __LINUX_USB_PD_H
> +
> +#include <linux/kernel.h>
> +#include <linux/types.h>
> +
> +enum typec_port_type {
> + TYPEC_PORT_SRC,
> + TYPEC_PORT_SNK,
> + TYPEC_PORT_DRP,
> +};
> +
> +enum typec_data_role {
> + TYPEC_DEVICE,
> + TYPEC_HOST,
> +};
> +
> +enum typec_role {
> + TYPEC_SINK,
> + TYPEC_SOURCE,
> +};
> +
> +/* USB PD Messages */
> +enum pd_ctrl_msg_type {
> + /* 0 Reserved */
> + PD_CTRL_GOOD_CRC = 1,
> + PD_CTRL_GOTO_MIN = 2,
> + PD_CTRL_ACCEPT = 3,
> + PD_CTRL_REJECT = 4,
> + PD_CTRL_PING = 5,
> + PD_CTRL_PS_RDY = 6,
> + PD_CTRL_GET_SOURCE_CAP = 7,
> + PD_CTRL_GET_SINK_CAP = 8,
> + PD_CTRL_DR_SWAP = 9,
> + PD_CTRL_PR_SWAP = 10,
> + PD_CTRL_VCONN_SWAP = 11,
> + PD_CTRL_WAIT = 12,
> + PD_CTRL_SOFT_RESET = 13,
> + /* 14-15 Reserved */
> + PD_CTRL_NOT_SUPP = 16,
> + PD_CTRL_GET_SOURCE_CAP_EXT = 17,
> + PD_CTRL_GET_STATUS = 18,
> + PD_CTRL_FR_SWAP = 19,
> + PD_CTRL_GET_PPS_STATUS = 20,
> + PD_CTRL_GET_COUNTRY_CODES = 21,
> + /* 22-31 Reserved */
> +};
> +
> +enum pd_data_msg_type {
> + /* 0 Reserved */
> + PD_DATA_SOURCE_CAP = 1,
> + PD_DATA_REQUEST = 2,
> + PD_DATA_BIST = 3,
> + PD_DATA_SINK_CAP = 4,
> + PD_DATA_BATT_STATUS = 5,
> + PD_DATA_ALERT = 6,
> + PD_DATA_GET_COUNTRY_INFO = 7,
> + PD_DATA_ENTER_USB = 8,
> + /* 9-14 Reserved */
> + PD_DATA_VENDOR_DEF = 15,
> + /* 16-31 Reserved */
> +};
> +
> +enum pd_ext_msg_type {
> + /* 0 Reserved */
> + PD_EXT_SOURCE_CAP_EXT = 1,
> + PD_EXT_STATUS = 2,
> + PD_EXT_GET_BATT_CAP = 3,
> + PD_EXT_GET_BATT_STATUS = 4,
> + PD_EXT_BATT_CAP = 5,
> + PD_EXT_GET_MANUFACTURER_INFO = 6,
> + PD_EXT_MANUFACTURER_INFO = 7,
> + PD_EXT_SECURITY_REQUEST = 8,
> + PD_EXT_SECURITY_RESPONSE = 9,
> + PD_EXT_FW_UPDATE_REQUEST = 10,
> + PD_EXT_FW_UPDATE_RESPONSE = 11,
> + PD_EXT_PPS_STATUS = 12,
> + PD_EXT_COUNTRY_INFO = 13,
> + PD_EXT_COUNTRY_CODES = 14,
> + /* 15-31 Reserved */
> +};
> +
> +#define PD_REV10 0x0
> +#define PD_REV20 0x1
> +#define PD_REV30 0x2
> +#define PD_MAX_REV PD_REV30
> +
> +#define PD_HEADER_EXT_HDR BIT(15)
> +#define PD_HEADER_CNT_SHIFT 12
> +#define PD_HEADER_CNT_MASK 0x7
> +#define PD_HEADER_ID_SHIFT 9
> +#define PD_HEADER_ID_MASK 0x7
> +#define PD_HEADER_PWR_ROLE BIT(8)
> +#define PD_HEADER_REV_SHIFT 6
> +#define PD_HEADER_REV_MASK 0x3
> +#define PD_HEADER_DATA_ROLE BIT(5)
> +#define PD_HEADER_TYPE_SHIFT 0
> +#define PD_HEADER_TYPE_MASK 0x1f
> +
> +#define PD_HEADER(type, pwr, data, rev, id, cnt, ext_hdr) \
> + ((((type) & PD_HEADER_TYPE_MASK) << PD_HEADER_TYPE_SHIFT) | \
> + ((pwr) == TYPEC_SOURCE ? PD_HEADER_PWR_ROLE : 0) | \
> + ((data) == TYPEC_HOST ? PD_HEADER_DATA_ROLE : 0) | \
> + ((rev) << PD_HEADER_REV_SHIFT) | \
> + (((id) & PD_HEADER_ID_MASK) << PD_HEADER_ID_SHIFT) | \
> + (((cnt) & PD_HEADER_CNT_MASK) << PD_HEADER_CNT_SHIFT) | \
> + ((ext_hdr) ? PD_HEADER_EXT_HDR : 0))
> +
> +#define PD_HEADER_LE(type, pwr, data, rev, id, cnt) \
> + cpu_to_le16(PD_HEADER((type), (pwr), (data), (rev), (id), (cnt), (0)))
> +
> +static inline unsigned int pd_header_cnt(u16 header)
> +{
> + return (header >> PD_HEADER_CNT_SHIFT) & PD_HEADER_CNT_MASK;
> +}
> +
> +static inline unsigned int pd_header_cnt_le(__le16 header)
> +{
> + return pd_header_cnt(le16_to_cpu(header));
> +}
> +
> +static inline unsigned int pd_header_type(u16 header)
> +{
> + return (header >> PD_HEADER_TYPE_SHIFT) & PD_HEADER_TYPE_MASK;
> +}
> +
> +static inline unsigned int pd_header_type_le(__le16 header)
> +{
> + return pd_header_type(le16_to_cpu(header));
> +}
> +
> +static inline unsigned int pd_header_msgid(u16 header)
> +{
> + return (header >> PD_HEADER_ID_SHIFT) & PD_HEADER_ID_MASK;
> +}
> +
> +static inline unsigned int pd_header_msgid_le(__le16 header)
> +{
> + return pd_header_msgid(le16_to_cpu(header));
> +}
> +
> +static inline unsigned int pd_header_rev(u16 header)
> +{
> + return (header >> PD_HEADER_REV_SHIFT) & PD_HEADER_REV_MASK;
> +}
> +
> +static inline unsigned int pd_header_rev_le(__le16 header)
> +{
> + return pd_header_rev(le16_to_cpu(header));
> +}
> +
> +#define PD_EXT_HDR_CHUNKED BIT(15)
> +#define PD_EXT_HDR_CHUNK_NUM_SHIFT 11
> +#define PD_EXT_HDR_CHUNK_NUM_MASK 0xf
> +#define PD_EXT_HDR_REQ_CHUNK BIT(10)
> +#define PD_EXT_HDR_DATA_SIZE_SHIFT 0
> +#define PD_EXT_HDR_DATA_SIZE_MASK 0x1ff
> +
> +#define PD_EXT_HDR(data_size, req_chunk, chunk_num, chunked) \
> + ((((data_size) & PD_EXT_HDR_DATA_SIZE_MASK) << PD_EXT_HDR_DATA_SIZE_SHIFT) | \
> + ((req_chunk) ? PD_EXT_HDR_REQ_CHUNK : 0) | \
> + (((chunk_num) & PD_EXT_HDR_CHUNK_NUM_MASK) << PD_EXT_HDR_CHUNK_NUM_SHIFT) | \
> + ((chunked) ? PD_EXT_HDR_CHUNKED : 0))
> +
> +#define PD_EXT_HDR_LE(data_size, req_chunk, chunk_num, chunked) \
> + cpu_to_le16(PD_EXT_HDR((data_size), (req_chunk), (chunk_num), (chunked)))
> +
> +static inline unsigned int pd_ext_header_chunk_num(u16 ext_header)
> +{
> + return (ext_header >> PD_EXT_HDR_CHUNK_NUM_SHIFT) &
> + PD_EXT_HDR_CHUNK_NUM_MASK;
> +}
> +
> +static inline unsigned int pd_ext_header_data_size(u16 ext_header)
> +{
> + return (ext_header >> PD_EXT_HDR_DATA_SIZE_SHIFT) &
> + PD_EXT_HDR_DATA_SIZE_MASK;
> +}
> +
> +static inline unsigned int pd_ext_header_data_size_le(__le16 ext_header)
> +{
> + return pd_ext_header_data_size(le16_to_cpu(ext_header));
> +}
> +
> +#define PD_MAX_PAYLOAD 7
> +#define PD_EXT_MAX_CHUNK_DATA 26
> +
> +/*
> + * struct pd_chunked_ext_message_data - PD chunked extended message data as
> + * seen on wire
> + * @header: PD extended message header
> + * @data: PD extended message data
> + */
> +struct pd_chunked_ext_message_data {
> + __le16 header;
> + u8 data[PD_EXT_MAX_CHUNK_DATA];
> +} __packed;
> +
> +/*
> + * struct pd_message - PD message as seen on wire
> + * @header: PD message header
> + * @payload: PD message payload
> + * @ext_msg: PD message chunked extended message data
> + */
> +struct pd_message {
> + __le16 header;
> + union {
> + __le32 payload[PD_MAX_PAYLOAD];
> + struct pd_chunked_ext_message_data ext_msg;
> + };
> +} __packed;
> +
> +/* PDO: Power Data Object */
> +#define PDO_MAX_OBJECTS 7
> +
> +enum pd_pdo_type {
> + PDO_TYPE_FIXED = 0,
> + PDO_TYPE_BATT = 1,
> + PDO_TYPE_VAR = 2,
> + PDO_TYPE_APDO = 3,
> +};
> +
> +#define PDO_TYPE_SHIFT 30
> +#define PDO_TYPE_MASK 0x3
> +
> +#define PDO_TYPE(t) ((t) << PDO_TYPE_SHIFT)
> +
> +#define PDO_VOLT_MASK 0x3ff
> +#define PDO_CURR_MASK 0x3ff
> +#define PDO_PWR_MASK 0x3ff
> +
> +#define PDO_FIXED_DUAL_ROLE BIT(29) /* Power role swap supported */
> +#define PDO_FIXED_SUSPEND BIT(28) /* USB Suspend supported (Source) */
> +#define PDO_FIXED_HIGHER_CAP BIT(28) /* Requires more than vSafe5V (Sink) */
> +#define PDO_FIXED_EXTPOWER BIT(27) /* Externally powered */
> +#define PDO_FIXED_USB_COMM BIT(26) /* USB communications capable */
> +#define PDO_FIXED_DATA_SWAP BIT(25) /* Data role swap supported */
> +#define PDO_FIXED_UNCHUNK_EXT BIT(24) /* Unchunked Extended Message supported (Source) */
> +#define PDO_FIXED_FRS_CURR_MASK (BIT(24) | BIT(23)) /* FR_Swap Current (Sink) */
> +#define PDO_FIXED_FRS_CURR_SHIFT 23
> +#define PDO_FIXED_VOLT_SHIFT 10 /* 50mV units */
> +#define PDO_FIXED_CURR_SHIFT 0 /* 10mA units */
> +
> +#define PDO_FIXED_VOLT(mv) ((((mv) / 50) & PDO_VOLT_MASK) << PDO_FIXED_VOLT_SHIFT)
> +#define PDO_FIXED_CURR(ma) ((((ma) / 10) & PDO_CURR_MASK) << PDO_FIXED_CURR_SHIFT)
> +
> +#define PDO_FIXED(mv, ma, flags) \
> + (PDO_TYPE(PDO_TYPE_FIXED) | (flags) | \
> + PDO_FIXED_VOLT(mv) | PDO_FIXED_CURR(ma))
> +
> +#define VSAFE5V 5000 /* mv units */
> +
> +#define PDO_BATT_MAX_VOLT_SHIFT 20 /* 50mV units */
> +#define PDO_BATT_MIN_VOLT_SHIFT 10 /* 50mV units */
> +#define PDO_BATT_MAX_PWR_SHIFT 0 /* 250mW units */
> +
> +#define PDO_BATT_MIN_VOLT(mv) ((((mv) / 50) & PDO_VOLT_MASK) << PDO_BATT_MIN_VOLT_SHIFT)
> +#define PDO_BATT_MAX_VOLT(mv) ((((mv) / 50) & PDO_VOLT_MASK) << PDO_BATT_MAX_VOLT_SHIFT)
> +#define PDO_BATT_MAX_POWER(mw) ((((mw) / 250) & PDO_PWR_MASK) << PDO_BATT_MAX_PWR_SHIFT)
> +
> +#define PDO_BATT(min_mv, max_mv, max_mw) \
> + (PDO_TYPE(PDO_TYPE_BATT) | PDO_BATT_MIN_VOLT(min_mv) | \
> + PDO_BATT_MAX_VOLT(max_mv) | PDO_BATT_MAX_POWER(max_mw))
> +
> +#define PDO_VAR_MAX_VOLT_SHIFT 20 /* 50mV units */
> +#define PDO_VAR_MIN_VOLT_SHIFT 10 /* 50mV units */
> +#define PDO_VAR_MAX_CURR_SHIFT 0 /* 10mA units */
> +
> +#define PDO_VAR_MIN_VOLT(mv) ((((mv) / 50) & PDO_VOLT_MASK) << PDO_VAR_MIN_VOLT_SHIFT)
> +#define PDO_VAR_MAX_VOLT(mv) ((((mv) / 50) & PDO_VOLT_MASK) << PDO_VAR_MAX_VOLT_SHIFT)
> +#define PDO_VAR_MAX_CURR(ma) ((((ma) / 10) & PDO_CURR_MASK) << PDO_VAR_MAX_CURR_SHIFT)
> +
> +#define PDO_VAR(min_mv, max_mv, max_ma) \
> + (PDO_TYPE(PDO_TYPE_VAR) | PDO_VAR_MIN_VOLT(min_mv) | \
> + PDO_VAR_MAX_VOLT(max_mv) | PDO_VAR_MAX_CURR(max_ma))
> +
> +enum pd_apdo_type {
> + APDO_TYPE_PPS = 0,
> +};
> +
> +#define PDO_APDO_TYPE_SHIFT 28 /* Only valid value currently is 0x0 - PPS */
> +#define PDO_APDO_TYPE_MASK 0x3
> +
> +#define PDO_APDO_TYPE(t) ((t) << PDO_APDO_TYPE_SHIFT)
> +
> +#define PDO_PPS_APDO_MAX_VOLT_SHIFT 17 /* 100mV units */
> +#define PDO_PPS_APDO_MIN_VOLT_SHIFT 8 /* 100mV units */
> +#define PDO_PPS_APDO_MAX_CURR_SHIFT 0 /* 50mA units */
> +
> +#define PDO_PPS_APDO_VOLT_MASK 0xff
> +#define PDO_PPS_APDO_CURR_MASK 0x7f
> +
> +#define PDO_PPS_APDO_MIN_VOLT(mv) \
> + ((((mv) / 100) & PDO_PPS_APDO_VOLT_MASK) << PDO_PPS_APDO_MIN_VOLT_SHIFT)
> +#define PDO_PPS_APDO_MAX_VOLT(mv) \
> + ((((mv) / 100) & PDO_PPS_APDO_VOLT_MASK) << PDO_PPS_APDO_MAX_VOLT_SHIFT)
> +#define PDO_PPS_APDO_MAX_CURR(ma) \
> + ((((ma) / 50) & PDO_PPS_APDO_CURR_MASK) << PDO_PPS_APDO_MAX_CURR_SHIFT)
> +
> +#define PDO_PPS_APDO(min_mv, max_mv, max_ma) \
> + (PDO_TYPE(PDO_TYPE_APDO) | PDO_APDO_TYPE(APDO_TYPE_PPS) | \
> + PDO_PPS_APDO_MIN_VOLT(min_mv) | PDO_PPS_APDO_MAX_VOLT(max_mv) | \
> + PDO_PPS_APDO_MAX_CURR(max_ma))
> +
> +static inline enum pd_pdo_type pdo_type(u32 pdo)
> +{
> + return (pdo >> PDO_TYPE_SHIFT) & PDO_TYPE_MASK;
> +}
> +
> +static inline unsigned int pdo_fixed_voltage(u32 pdo)
> +{
> + return ((pdo >> PDO_FIXED_VOLT_SHIFT) & PDO_VOLT_MASK) * 50;
> +}
> +
> +static inline unsigned int pdo_min_voltage(u32 pdo)
> +{
> + return ((pdo >> PDO_VAR_MIN_VOLT_SHIFT) & PDO_VOLT_MASK) * 50;
> +}
> +
> +static inline unsigned int pdo_max_voltage(u32 pdo)
> +{
> + return ((pdo >> PDO_VAR_MAX_VOLT_SHIFT) & PDO_VOLT_MASK) * 50;
> +}
> +
> +static inline unsigned int pdo_max_current(u32 pdo)
> +{
> + return ((pdo >> PDO_VAR_MAX_CURR_SHIFT) & PDO_CURR_MASK) * 10;
> +}
> +
> +static inline unsigned int pdo_max_power(u32 pdo)
> +{
> + return ((pdo >> PDO_BATT_MAX_PWR_SHIFT) & PDO_PWR_MASK) * 250;
> +}
> +
> +static inline enum pd_apdo_type pdo_apdo_type(u32 pdo)
> +{
> + return (pdo >> PDO_APDO_TYPE_SHIFT) & PDO_APDO_TYPE_MASK;
> +}
> +
> +static inline unsigned int pdo_pps_apdo_min_voltage(u32 pdo)
> +{
> + return ((pdo >> PDO_PPS_APDO_MIN_VOLT_SHIFT) &
> + PDO_PPS_APDO_VOLT_MASK) * 100;
> +}
> +
> +static inline unsigned int pdo_pps_apdo_max_voltage(u32 pdo)
> +{
> + return ((pdo >> PDO_PPS_APDO_MAX_VOLT_SHIFT) &
> + PDO_PPS_APDO_VOLT_MASK) * 100;
> +}
> +
> +static inline unsigned int pdo_pps_apdo_max_current(u32 pdo)
> +{
> + return ((pdo >> PDO_PPS_APDO_MAX_CURR_SHIFT) &
> + PDO_PPS_APDO_CURR_MASK) * 50;
> +}
> +
> +/* RDO: Request Data Object */
> +#define RDO_OBJ_POS_SHIFT 28
> +#define RDO_OBJ_POS_MASK 0x7
> +#define RDO_GIVE_BACK BIT(27) /* Supports reduced operating current */
> +#define RDO_CAP_MISMATCH BIT(26) /* Not satisfied by source caps */
> +#define RDO_USB_COMM BIT(25) /* USB communications capable */
> +#define RDO_NO_SUSPEND BIT(24) /* USB Suspend not supported */
> +
> +#define RDO_PWR_MASK 0x3ff
> +#define RDO_CURR_MASK 0x3ff
> +
> +#define RDO_FIXED_OP_CURR_SHIFT 10
> +#define RDO_FIXED_MAX_CURR_SHIFT 0
> +
> +#define RDO_OBJ(idx) (((idx) & RDO_OBJ_POS_MASK) << RDO_OBJ_POS_SHIFT)
> +
> +#define PDO_FIXED_OP_CURR(ma) ((((ma) / 10) & RDO_CURR_MASK) << RDO_FIXED_OP_CURR_SHIFT)
> +#define PDO_FIXED_MAX_CURR(ma) ((((ma) / 10) & RDO_CURR_MASK) << RDO_FIXED_MAX_CURR_SHIFT)
> +
> +#define RDO_FIXED(idx, op_ma, max_ma, flags) \
> + (RDO_OBJ(idx) | (flags) | \
> + PDO_FIXED_OP_CURR(op_ma) | PDO_FIXED_MAX_CURR(max_ma))
> +
> +#define RDO_BATT_OP_PWR_SHIFT 10 /* 250mW units */
> +#define RDO_BATT_MAX_PWR_SHIFT 0 /* 250mW units */
> +
> +#define RDO_BATT_OP_PWR(mw) ((((mw) / 250) & RDO_PWR_MASK) << RDO_BATT_OP_PWR_SHIFT)
> +#define RDO_BATT_MAX_PWR(mw) ((((mw) / 250) & RDO_PWR_MASK) << RDO_BATT_MAX_PWR_SHIFT)
> +
> +#define RDO_BATT(idx, op_mw, max_mw, flags) \
> + (RDO_OBJ(idx) | (flags) | \
> + RDO_BATT_OP_PWR(op_mw) | RDO_BATT_MAX_PWR(max_mw))
> +
> +#define RDO_PROG_VOLT_MASK 0x7ff
> +#define RDO_PROG_CURR_MASK 0x7f
> +
> +#define RDO_PROG_VOLT_SHIFT 9
> +#define RDO_PROG_CURR_SHIFT 0
> +
> +#define RDO_PROG_VOLT_MV_STEP 20
> +#define RDO_PROG_CURR_MA_STEP 50
> +
> +#define PDO_PROG_OUT_VOLT(mv) \
> + ((((mv) / RDO_PROG_VOLT_MV_STEP) & RDO_PROG_VOLT_MASK) << RDO_PROG_VOLT_SHIFT)
> +#define PDO_PROG_OP_CURR(ma) \
> + ((((ma) / RDO_PROG_CURR_MA_STEP) & RDO_PROG_CURR_MASK) << RDO_PROG_CURR_SHIFT)
> +
> +#define RDO_PROG(idx, out_mv, op_ma, flags) \
> + (RDO_OBJ(idx) | (flags) | \
> + PDO_PROG_OUT_VOLT(out_mv) | PDO_PROG_OP_CURR(op_ma))
> +
> +static inline unsigned int rdo_index(u32 rdo)
> +{
> + return (rdo >> RDO_OBJ_POS_SHIFT) & RDO_OBJ_POS_MASK;
> +}
> +
> +static inline unsigned int rdo_op_current(u32 rdo)
> +{
> + return ((rdo >> RDO_FIXED_OP_CURR_SHIFT) & RDO_CURR_MASK) * 10;
> +}
> +
> +static inline unsigned int rdo_max_current(u32 rdo)
> +{
> + return ((rdo >> RDO_FIXED_MAX_CURR_SHIFT) &
> + RDO_CURR_MASK) * 10;
> +}
> +
> +static inline unsigned int rdo_op_power(u32 rdo)
> +{
> + return ((rdo >> RDO_BATT_OP_PWR_SHIFT) & RDO_PWR_MASK) * 250;
> +}
> +
> +static inline unsigned int rdo_max_power(u32 rdo)
> +{
> + return ((rdo >> RDO_BATT_MAX_PWR_SHIFT) & RDO_PWR_MASK) * 250;
> +}
> +
> +/* Enter_USB Data Object */
> +#define EUDO_USB_MODE_MASK GENMASK(30, 28)
> +#define EUDO_USB_MODE_SHIFT 28
> +#define EUDO_USB_MODE_USB2 0
> +#define EUDO_USB_MODE_USB3 1
> +#define EUDO_USB_MODE_USB4 2
> +#define EUDO_USB4_DRD BIT(26)
> +#define EUDO_USB3_DRD BIT(25)
> +#define EUDO_CABLE_SPEED_MASK GENMASK(23, 21)
> +#define EUDO_CABLE_SPEED_SHIFT 21
> +#define EUDO_CABLE_SPEED_USB2 0
> +#define EUDO_CABLE_SPEED_USB3_GEN1 1
> +#define EUDO_CABLE_SPEED_USB4_GEN2 2
> +#define EUDO_CABLE_SPEED_USB4_GEN3 3
> +#define EUDO_CABLE_TYPE_MASK GENMASK(20, 19)
> +#define EUDO_CABLE_TYPE_SHIFT 19
> +#define EUDO_CABLE_TYPE_PASSIVE 0
> +#define EUDO_CABLE_TYPE_RE_TIMER 1
> +#define EUDO_CABLE_TYPE_RE_DRIVER 2
> +#define EUDO_CABLE_TYPE_OPTICAL 3
> +#define EUDO_CABLE_CURRENT_MASK GENMASK(18, 17)
> +#define EUDO_CABLE_CURRENT_SHIFT 17
> +#define EUDO_CABLE_CURRENT_NOTSUPP 0
> +#define EUDO_CABLE_CURRENT_3A 2
> +#define EUDO_CABLE_CURRENT_5A 3
> +#define EUDO_PCIE_SUPPORT BIT(16)
> +#define EUDO_DP_SUPPORT BIT(15)
> +#define EUDO_TBT_SUPPORT BIT(14)
> +#define EUDO_HOST_PRESENT BIT(13)
> +
> +/* USB PD timers and counters */
> +#define PD_T_NO_RESPONSE 5000 /* 4.5 - 5.5 seconds */
> +#define PD_T_DB_DETECT 10000 /* 10 - 15 seconds */
> +#define PD_T_SEND_SOURCE_CAP 150 /* 100 - 200 ms */
> +#define PD_T_SENDER_RESPONSE 60 /* 24 - 30 ms, relaxed */
> +#define PD_T_RECEIVER_RESPONSE 15 /* 15ms max */
> +#define PD_T_SOURCE_ACTIVITY 45
> +#define PD_T_SINK_ACTIVITY 135
> +#define PD_T_SINK_WAIT_CAP 310 /* 310 - 620 ms */
> +#define PD_T_PS_TRANSITION 500
> +#define PD_T_SRC_TRANSITION 35
> +#define PD_T_DRP_SNK 40
> +#define PD_T_DRP_SRC 30
> +#define PD_T_PS_SOURCE_OFF 920
> +#define PD_T_PS_SOURCE_ON 480
> +#define PD_T_PS_SOURCE_ON_PRS 450 /* 390 - 480ms */
> +#define PD_T_PS_HARD_RESET 30
> +#define PD_T_SRC_RECOVER 760
> +#define PD_T_SRC_RECOVER_MAX 1000
> +#define PD_T_SRC_TURN_ON 275
> +#define PD_T_SAFE_0V 650
> +#define PD_T_VCONN_SOURCE_ON 100
> +#define PD_T_SINK_REQUEST 100 /* 100 ms minimum */
> +#define PD_T_ERROR_RECOVERY 100 /* minimum 25 is insufficient */
> +#define PD_T_SRCSWAPSTDBY 625 /* Maximum of 650ms */
> +#define PD_T_NEWSRC 250 /* Maximum of 275ms */
> +#define PD_T_SWAP_SRC_START 20 /* Minimum of 20ms */
> +#define PD_T_BIST_CONT_MODE 50 /* 30 - 60 ms */
> +#define PD_T_SINK_TX 16 /* 16 - 20 ms */
> +#define PD_T_CHUNK_NOT_SUPP 42 /* 40 - 50 ms */
> +
> +#define PD_T_DRP_TRY 100 /* 75 - 150 ms */
> +#define PD_T_DRP_TRYWAIT 600 /* 400 - 800 ms */
> +
> +#define PD_T_CC_DEBOUNCE 200 /* 100 - 200 ms */
> +#define PD_T_PD_DEBOUNCE 20 /* 10 - 20 ms */
> +#define PD_T_TRY_CC_DEBOUNCE 15 /* 10 - 20 ms */
> +
> +#define PD_N_CAPS_COUNT (PD_T_NO_RESPONSE / PD_T_SEND_SOURCE_CAP)
> +#define PD_N_HARD_RESET_COUNT 1
> +
> +#define PD_P_SNK_STDBY_MW 2500 /* 2500 mW */
> +
> +/* Time to wait for TCPC to complete transmit */
> +#define PD_T_TCPC_TX_TIMEOUT 100 /* in ms */
> +
> +#endif /* __LINUX_USB_PD_H */
> diff --git a/include/usb/tcpm.h b/include/usb/tcpm.h
> new file mode 100644
> index 000000000000..4574a5175ddb
> --- /dev/null
> +++ b/include/usb/tcpm.h
> @@ -0,0 +1,99 @@
> +/* SPDX-License-Identifier: GPL-2.0-or-later */
> +/*
> + * Copyright 2015-2017 Google, Inc
> + * Copyright 2024 Collabora
> + */
> +
> +#ifndef __LINUX_USB_TCPM_H
> +#define __LINUX_USB_TCPM_H
> +
> +#include <dm/of.h>
> +#include <linux/bitops.h>
> +#include "pd.h"
> +
> +enum typec_orientation {
> + TYPEC_ORIENTATION_NONE,
> + TYPEC_ORIENTATION_NORMAL,
> + TYPEC_ORIENTATION_REVERSE,
> +};
> +
> +enum typec_cc_status {
> + TYPEC_CC_OPEN,
> + TYPEC_CC_RA,
> + TYPEC_CC_RD,
> + TYPEC_CC_RP_DEF,
> + TYPEC_CC_RP_1_5,
> + TYPEC_CC_RP_3_0,
> +};
> +
> +enum typec_cc_polarity {
> + TYPEC_POLARITY_CC1,
> + TYPEC_POLARITY_CC2,
> +};
> +
> +enum tcpm_transmit_status {
> + TCPC_TX_SUCCESS = 0,
> + TCPC_TX_DISCARDED = 1,
> + TCPC_TX_FAILED = 2,
> +};
> +
> +enum tcpm_transmit_type {
> + TCPC_TX_SOP = 0,
> + TCPC_TX_SOP_PRIME = 1,
> + TCPC_TX_SOP_PRIME_PRIME = 2,
> + TCPC_TX_SOP_DEBUG_PRIME = 3,
> + TCPC_TX_SOP_DEBUG_PRIME_PRIME = 4,
> + TCPC_TX_HARD_RESET = 5,
> + TCPC_TX_CABLE_RESET = 6,
> + TCPC_TX_BIST_MODE_2 = 7
> +};
> +
> +struct dm_tcpm_ops {
> + int (*get_connector_node)(struct udevice *dev, ofnode *connector_node);
> + int (*init)(struct udevice *dev);
> + int (*get_vbus)(struct udevice *dev);
> + int (*set_cc)(struct udevice *dev, enum typec_cc_status cc);
> + int (*get_cc)(struct udevice *dev, enum typec_cc_status *cc1,
> + enum typec_cc_status *cc2);
> + int (*set_polarity)(struct udevice *dev,
> + enum typec_cc_polarity polarity);
> + int (*set_vconn)(struct udevice *dev, bool on);
> + int (*set_vbus)(struct udevice *dev, bool on, bool charge);
> + int (*set_pd_rx)(struct udevice *dev, bool on);
> + int (*set_roles)(struct udevice *dev, bool attached,
> + enum typec_role role, enum typec_data_role data);
> + int (*start_toggling)(struct udevice *dev,
> + enum typec_port_type port_type,
> + enum typec_cc_status cc);
> + int (*pd_transmit)(struct udevice *dev, enum tcpm_transmit_type type,
> + const struct pd_message *msg, unsigned int negotiated_rev);
> + void (*poll_event)(struct udevice *dev);
> + int (*enter_low_power_mode)(struct udevice *dev, bool attached, bool pd_capable);
> +};
> +
> +/* API for drivers */
> +void tcpm_vbus_change(struct udevice *dev);
> +void tcpm_cc_change(struct udevice *dev);
> +void tcpm_pd_receive(struct udevice *dev, const struct pd_message *msg);
> +void tcpm_pd_transmit_complete(struct udevice *dev,
> + enum tcpm_transmit_status status);
> +void tcpm_pd_hard_reset(struct udevice *dev);
> +
> +/* API for boards */
> +extern const char * const typec_pd_rev_name[];
> +extern const char * const typec_orientation_name[];
> +extern const char * const typec_role_name[];
> +extern const char * const typec_data_role_name[];
> +extern const char * const typec_cc_status_name[];
> +
> +int tcpm_get(const char *name, struct udevice **devp);
> +int tcpm_get_pd_rev(struct udevice *dev);
> +int tcpm_get_current(struct udevice *dev);
> +int tcpm_get_voltage(struct udevice *dev);
> +enum typec_orientation tcpm_get_orientation(struct udevice *dev);
> +enum typec_role tcpm_get_pwr_role(struct udevice *dev);
> +enum typec_data_role tcpm_get_data_role(struct udevice *dev);
> +bool tcpm_is_connected(struct udevice *dev);
> +const char *tcpm_get_state(struct udevice *dev);
> +
> +#endif /* __LINUX_USB_TCPM_H */
> --
> 2.45.2
>
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