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usb: typec: driver for Intel PMC mux control
The Intel PMC microcontroller on the latest Intel platforms has a new function that allows configuration of the USB Multiplexer/DeMultiplexer switches that are under the control of the PMC. The Intel PMC mux control (aka. mux-agent) can be used for swapping the USB data role and for entering alternate modes, DisplayPort or Thunderbolt3. Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com> Link: https://lore.kernel.org/r/20200302135353.56659-10-heikki.krogerus@linux.intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Heikki Krogerus
Greg Kroah-Hartman
parent
ca469c292e
commit
6701adfa96
@ -9,4 +9,13 @@ config TYPEC_MUX_PI3USB30532
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Say Y or M if your system has a Pericom PI3USB30532 Type-C cross
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switch / mux chip found on some devices with a Type-C port.
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config TYPEC_MUX_INTEL_PMC
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tristate "Intel PMC mux control"
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depends on INTEL_PMC_IPC
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select USB_ROLE_SWITCH
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help
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Driver for USB muxes controlled by Intel PMC FW. Intel PMC FW can
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control the USB role switch and also the multiplexer/demultiplexer
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switches used with USB Type-C Alternate Modes.
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endmenu
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@ -1,3 +1,4 @@
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# SPDX-License-Identifier: GPL-2.0
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obj-$(CONFIG_TYPEC_MUX_PI3USB30532) += pi3usb30532.o
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obj-$(CONFIG_TYPEC_MUX_INTEL_PMC) += intel_pmc_mux.o
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434
drivers/usb/typec/mux/intel_pmc_mux.c
Normal file
434
drivers/usb/typec/mux/intel_pmc_mux.c
Normal file
@ -0,0 +1,434 @@
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// SPDX-License-Identifier: GPL-2.0
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/*
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* Driver for Intel PMC USB mux control
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*
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* Copyright (C) 2020 Intel Corporation
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* Author: Heikki Krogerus <heikki.krogerus@linux.intel.com>
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*/
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#include <linux/acpi.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/property.h>
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#include <linux/usb/role.h>
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#include <linux/usb/typec_mux.h>
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#include <linux/usb/typec_dp.h>
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#include <linux/usb/typec_tbt.h>
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#include <asm/intel_pmc_ipc.h>
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#define PMC_USBC_CMD 0xa7
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/* "Usage" OOB Message field values */
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enum {
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PMC_USB_CONNECT,
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PMC_USB_DISCONNECT,
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PMC_USB_SAFE_MODE,
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PMC_USB_ALT_MODE,
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PMC_USB_DP_HPD,
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};
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#define PMC_USB_MSG_USB2_PORT_SHIFT 0
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#define PMC_USB_MSG_USB3_PORT_SHIFT 4
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#define PMC_USB_MSG_UFP_SHIFT 4
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#define PMC_USB_MSG_ORI_HSL_SHIFT 5
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#define PMC_USB_MSG_ORI_AUX_SHIFT 6
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/* Alt Mode Request */
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struct altmode_req {
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u8 usage;
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u8 mode_type;
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u8 mode_id;
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u8 reserved;
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u32 mode_data;
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} __packed;
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#define PMC_USB_MODE_TYPE_SHIFT 4
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enum {
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PMC_USB_MODE_TYPE_USB,
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PMC_USB_MODE_TYPE_DP,
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PMC_USB_MODE_TYPE_TBT,
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};
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/* Common Mode Data bits */
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#define PMC_USB_ALTMODE_ACTIVE_CABLE BIT(2)
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#define PMC_USB_ALTMODE_ORI_SHIFT 1
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#define PMC_USB_ALTMODE_UFP_SHIFT 3
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#define PMC_USB_ALTMODE_ORI_AUX_SHIFT 4
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#define PMC_USB_ALTMODE_ORI_HSL_SHIFT 5
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/* DP specific Mode Data bits */
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#define PMC_USB_ALTMODE_DP_MODE_SHIFT 8
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/* TBT specific Mode Data bits */
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#define PMC_USB_ALTMODE_TBT_TYPE BIT(17)
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#define PMC_USB_ALTMODE_CABLE_TYPE BIT(18)
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#define PMC_USB_ALTMODE_ACTIVE_LINK BIT(20)
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#define PMC_USB_ALTMODE_FORCE_LSR BIT(23)
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#define PMC_USB_ALTMODE_CABLE_SPD(_s_) (((_s_) & GENMASK(2, 0)) << 25)
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#define PMC_USB_ALTMODE_CABLE_USB31 1
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#define PMC_USB_ALTMODE_CABLE_10GPS 2
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#define PMC_USB_ALTMODE_CABLE_20GPS 3
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#define PMC_USB_ALTMODE_TBT_GEN(_g_) (((_g_) & GENMASK(1, 0)) << 28)
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/* Display HPD Request bits */
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#define PMC_USB_DP_HPD_IRQ BIT(5)
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#define PMC_USB_DP_HPD_LVL BIT(6)
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struct pmc_usb;
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struct pmc_usb_port {
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int num;
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struct pmc_usb *pmc;
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struct typec_mux *typec_mux;
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struct typec_switch *typec_sw;
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struct usb_role_switch *usb_sw;
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enum typec_orientation orientation;
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enum usb_role role;
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u8 usb2_port;
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u8 usb3_port;
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};
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struct pmc_usb {
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u8 num_ports;
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struct device *dev;
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struct pmc_usb_port *port;
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};
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static int pmc_usb_command(struct pmc_usb_port *port, u8 *msg, u32 len)
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{
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u8 response[4];
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/*
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* Error bit will always be 0 with the USBC command.
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* Status can be checked from the response message.
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*/
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intel_pmc_ipc_command(PMC_USBC_CMD, 0, msg, len,
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(void *)response, 1);
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if (response[2]) {
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if (response[2] & BIT(1))
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return -EIO;
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return -EBUSY;
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}
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return 0;
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}
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static int
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pmc_usb_mux_dp_hpd(struct pmc_usb_port *port, struct typec_mux_state *state)
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{
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struct typec_displayport_data *data = state->data;
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u8 msg[2] = { };
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msg[0] = PMC_USB_DP_HPD;
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msg[0] |= port->usb3_port << PMC_USB_MSG_USB3_PORT_SHIFT;
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msg[1] = PMC_USB_DP_HPD_IRQ;
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if (data->status & DP_STATUS_HPD_STATE)
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msg[1] |= PMC_USB_DP_HPD_LVL;
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return pmc_usb_command(port, msg, sizeof(msg));
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}
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static int
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pmc_usb_mux_dp(struct pmc_usb_port *port, struct typec_mux_state *state)
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{
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struct typec_displayport_data *data = state->data;
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struct altmode_req req = { };
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if (data->status & DP_STATUS_IRQ_HPD)
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return pmc_usb_mux_dp_hpd(port, state);
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req.usage = PMC_USB_ALT_MODE;
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req.usage |= port->usb3_port << PMC_USB_MSG_USB3_PORT_SHIFT;
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req.mode_type = PMC_USB_MODE_TYPE_DP << PMC_USB_MODE_TYPE_SHIFT;
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req.mode_data = (port->orientation - 1) << PMC_USB_ALTMODE_ORI_SHIFT;
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req.mode_data |= (port->role - 1) << PMC_USB_ALTMODE_UFP_SHIFT;
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req.mode_data |= (port->orientation - 1) << PMC_USB_ALTMODE_ORI_AUX_SHIFT;
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req.mode_data |= (port->orientation - 1) << PMC_USB_ALTMODE_ORI_HSL_SHIFT;
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req.mode_data |= (state->mode - TYPEC_STATE_MODAL) <<
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PMC_USB_ALTMODE_DP_MODE_SHIFT;
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return pmc_usb_command(port, (void *)&req, sizeof(req));
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}
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static int
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pmc_usb_mux_tbt(struct pmc_usb_port *port, struct typec_mux_state *state)
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{
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struct typec_thunderbolt_data *data = state->data;
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u8 cable_speed = TBT_CABLE_SPEED(data->cable_mode);
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struct altmode_req req = { };
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req.usage = PMC_USB_ALT_MODE;
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req.usage |= port->usb3_port << PMC_USB_MSG_USB3_PORT_SHIFT;
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req.mode_type = PMC_USB_MODE_TYPE_TBT << PMC_USB_MODE_TYPE_SHIFT;
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req.mode_data = (port->orientation - 1) << PMC_USB_ALTMODE_ORI_SHIFT;
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req.mode_data |= (port->role - 1) << PMC_USB_ALTMODE_UFP_SHIFT;
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req.mode_data |= (port->orientation - 1) << PMC_USB_ALTMODE_ORI_AUX_SHIFT;
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req.mode_data |= (port->orientation - 1) << PMC_USB_ALTMODE_ORI_HSL_SHIFT;
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if (TBT_ADAPTER(data->device_mode) == TBT_ADAPTER_TBT3)
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req.mode_data |= PMC_USB_ALTMODE_TBT_TYPE;
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if (data->cable_mode & TBT_CABLE_OPTICAL)
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req.mode_data |= PMC_USB_ALTMODE_CABLE_TYPE;
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if (data->cable_mode & TBT_CABLE_LINK_TRAINING)
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req.mode_data |= PMC_USB_ALTMODE_ACTIVE_LINK;
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if (data->enter_vdo & TBT_ENTER_MODE_ACTIVE_CABLE)
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req.mode_data |= PMC_USB_ALTMODE_ACTIVE_CABLE;
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req.mode_data |= PMC_USB_ALTMODE_CABLE_SPD(cable_speed);
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return pmc_usb_command(port, (void *)&req, sizeof(req));
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}
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static int pmc_usb_mux_safe_state(struct pmc_usb_port *port)
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{
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u8 msg;
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msg = PMC_USB_SAFE_MODE;
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msg |= port->usb3_port << PMC_USB_MSG_USB3_PORT_SHIFT;
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return pmc_usb_command(port, &msg, sizeof(msg));
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}
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static int pmc_usb_connect(struct pmc_usb_port *port)
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{
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u8 msg[2];
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msg[0] = PMC_USB_CONNECT;
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msg[0] |= port->usb3_port << PMC_USB_MSG_USB3_PORT_SHIFT;
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msg[1] = port->usb2_port << PMC_USB_MSG_USB2_PORT_SHIFT;
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msg[1] |= (port->orientation - 1) << PMC_USB_MSG_ORI_HSL_SHIFT;
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msg[1] |= (port->orientation - 1) << PMC_USB_MSG_ORI_AUX_SHIFT;
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return pmc_usb_command(port, msg, sizeof(msg));
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}
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static int pmc_usb_disconnect(struct pmc_usb_port *port)
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{
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u8 msg[2];
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msg[0] = PMC_USB_DISCONNECT;
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msg[0] |= port->usb3_port << PMC_USB_MSG_USB3_PORT_SHIFT;
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msg[1] = port->usb2_port << PMC_USB_MSG_USB2_PORT_SHIFT;
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return pmc_usb_command(port, msg, sizeof(msg));
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}
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static int
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pmc_usb_mux_set(struct typec_mux *mux, struct typec_mux_state *state)
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{
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struct pmc_usb_port *port = typec_mux_get_drvdata(mux);
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if (!state->alt)
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return 0;
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if (state->mode == TYPEC_STATE_SAFE)
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return pmc_usb_mux_safe_state(port);
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switch (state->alt->svid) {
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case USB_TYPEC_TBT_SID:
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return pmc_usb_mux_tbt(port, state);
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case USB_TYPEC_DP_SID:
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return pmc_usb_mux_dp(port, state);
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}
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return -EOPNOTSUPP;
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}
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static int pmc_usb_set_orientation(struct typec_switch *sw,
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enum typec_orientation orientation)
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{
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struct pmc_usb_port *port = typec_switch_get_drvdata(sw);
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if (port->orientation == orientation)
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return 0;
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port->orientation = orientation;
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if (port->role) {
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if (orientation == TYPEC_ORIENTATION_NONE)
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return pmc_usb_disconnect(port);
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else
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return pmc_usb_connect(port);
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}
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return 0;
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}
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static int pmc_usb_set_role(struct usb_role_switch *sw, enum usb_role role)
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{
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struct pmc_usb_port *port = usb_role_switch_get_drvdata(sw);
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if (port->role == role)
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return 0;
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port->role = role;
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if (port->orientation) {
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if (role == USB_ROLE_NONE)
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return pmc_usb_disconnect(port);
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else
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return pmc_usb_connect(port);
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}
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return 0;
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}
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static int pmc_usb_register_port(struct pmc_usb *pmc, int index,
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struct fwnode_handle *fwnode)
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{
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struct pmc_usb_port *port = &pmc->port[index];
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struct usb_role_switch_desc desc = { };
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struct typec_switch_desc sw_desc = { };
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struct typec_mux_desc mux_desc = { };
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int ret;
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ret = fwnode_property_read_u8(fwnode, "usb2-port", &port->usb2_port);
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if (ret)
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return ret;
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ret = fwnode_property_read_u8(fwnode, "usb3-port", &port->usb3_port);
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if (ret)
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return ret;
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port->num = index;
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port->pmc = pmc;
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sw_desc.fwnode = fwnode;
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sw_desc.drvdata = port;
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sw_desc.name = fwnode_get_name(fwnode);
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sw_desc.set = pmc_usb_set_orientation;
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port->typec_sw = typec_switch_register(pmc->dev, &sw_desc);
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if (IS_ERR(port->typec_sw))
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return PTR_ERR(port->typec_sw);
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mux_desc.fwnode = fwnode;
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mux_desc.drvdata = port;
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mux_desc.name = fwnode_get_name(fwnode);
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mux_desc.set = pmc_usb_mux_set;
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port->typec_mux = typec_mux_register(pmc->dev, &mux_desc);
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if (IS_ERR(port->typec_mux)) {
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ret = PTR_ERR(port->typec_mux);
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goto err_unregister_switch;
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}
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desc.fwnode = fwnode;
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desc.driver_data = port;
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desc.name = fwnode_get_name(fwnode);
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desc.set = pmc_usb_set_role;
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port->usb_sw = usb_role_switch_register(pmc->dev, &desc);
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if (IS_ERR(port->usb_sw)) {
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ret = PTR_ERR(port->usb_sw);
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goto err_unregister_mux;
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}
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return 0;
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err_unregister_mux:
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typec_mux_unregister(port->typec_mux);
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err_unregister_switch:
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typec_switch_unregister(port->typec_sw);
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return ret;
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}
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static int pmc_usb_probe(struct platform_device *pdev)
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{
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struct fwnode_handle *fwnode = NULL;
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struct pmc_usb *pmc;
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int i = 0;
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int ret;
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pmc = devm_kzalloc(&pdev->dev, sizeof(*pmc), GFP_KERNEL);
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if (!pmc)
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return -ENOMEM;
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device_for_each_child_node(&pdev->dev, fwnode)
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pmc->num_ports++;
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pmc->port = devm_kcalloc(&pdev->dev, pmc->num_ports,
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sizeof(struct pmc_usb_port), GFP_KERNEL);
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if (!pmc->port)
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return -ENOMEM;
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pmc->dev = &pdev->dev;
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/*
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* For every physical USB connector (USB2 and USB3 combo) there is a
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* child ACPI device node under the PMC mux ACPI device object.
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*/
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for (i = 0; i < pmc->num_ports; i++) {
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fwnode = device_get_next_child_node(pmc->dev, fwnode);
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if (!fwnode)
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break;
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ret = pmc_usb_register_port(pmc, i, fwnode);
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if (ret)
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goto err_remove_ports;
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}
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platform_set_drvdata(pdev, pmc);
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return 0;
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err_remove_ports:
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for (i = 0; i < pmc->num_ports; i++) {
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typec_switch_unregister(pmc->port[i].typec_sw);
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typec_mux_unregister(pmc->port[i].typec_mux);
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}
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return ret;
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}
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static int pmc_usb_remove(struct platform_device *pdev)
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{
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struct pmc_usb *pmc = platform_get_drvdata(pdev);
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int i;
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for (i = 0; i < pmc->num_ports; i++) {
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typec_switch_unregister(pmc->port[i].typec_sw);
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typec_mux_unregister(pmc->port[i].typec_mux);
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}
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return 0;
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}
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static const struct acpi_device_id pmc_usb_acpi_ids[] = {
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{ "INTC105C", },
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{ }
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};
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MODULE_DEVICE_TABLE(acpi, pmc_usb_acpi_ids);
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static struct platform_driver pmc_usb_driver = {
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.driver = {
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.name = "intel_pmc_usb",
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||||
.acpi_match_table = ACPI_PTR(pmc_usb_acpi_ids),
|
||||
},
|
||||
.probe = pmc_usb_probe,
|
||||
.remove = pmc_usb_remove,
|
||||
};
|
||||
|
||||
module_platform_driver(pmc_usb_driver);
|
||||
|
||||
MODULE_AUTHOR("Heikki Krogerus <heikki.krogerus@linux.intel.com>");
|
||||
MODULE_LICENSE("GPL v2");
|
||||
MODULE_DESCRIPTION("Intel PMC USB mux control");
|
||||
Loading…
Reference in New Issue
Block a user