1 // SPDX-License-Identifier: GPL-2.0
3 * Driver for Intel PMC USB mux control
5 * Copyright (C) 2020 Intel Corporation
6 * Author: Heikki Krogerus <heikki.krogerus@linux.intel.com>
9 #include <linux/acpi.h>
10 #include <linux/module.h>
11 #include <linux/platform_device.h>
12 #include <linux/property.h>
13 #include <linux/usb/role.h>
14 #include <linux/usb/typec_mux.h>
15 #include <linux/usb/typec_dp.h>
16 #include <linux/usb/typec_tbt.h>
18 #include <asm/intel_pmc_ipc.h>
20 #define PMC_USBC_CMD 0xa7
22 /* "Usage" OOB Message field values */
31 #define PMC_USB_MSG_USB2_PORT_SHIFT 0
32 #define PMC_USB_MSG_USB3_PORT_SHIFT 4
33 #define PMC_USB_MSG_UFP_SHIFT 4
34 #define PMC_USB_MSG_ORI_HSL_SHIFT 5
35 #define PMC_USB_MSG_ORI_AUX_SHIFT 6
37 /* Alt Mode Request */
46 #define PMC_USB_MODE_TYPE_SHIFT 4
49 PMC_USB_MODE_TYPE_USB,
51 PMC_USB_MODE_TYPE_TBT,
54 /* Common Mode Data bits */
55 #define PMC_USB_ALTMODE_ACTIVE_CABLE BIT(2)
57 #define PMC_USB_ALTMODE_ORI_SHIFT 1
58 #define PMC_USB_ALTMODE_UFP_SHIFT 3
59 #define PMC_USB_ALTMODE_ORI_AUX_SHIFT 4
60 #define PMC_USB_ALTMODE_ORI_HSL_SHIFT 5
62 /* DP specific Mode Data bits */
63 #define PMC_USB_ALTMODE_DP_MODE_SHIFT 8
65 /* TBT specific Mode Data bits */
66 #define PMC_USB_ALTMODE_TBT_TYPE BIT(17)
67 #define PMC_USB_ALTMODE_CABLE_TYPE BIT(18)
68 #define PMC_USB_ALTMODE_ACTIVE_LINK BIT(20)
69 #define PMC_USB_ALTMODE_FORCE_LSR BIT(23)
70 #define PMC_USB_ALTMODE_CABLE_SPD(_s_) (((_s_) & GENMASK(2, 0)) << 25)
71 #define PMC_USB_ALTMODE_CABLE_USB31 1
72 #define PMC_USB_ALTMODE_CABLE_10GPS 2
73 #define PMC_USB_ALTMODE_CABLE_20GPS 3
74 #define PMC_USB_ALTMODE_TBT_GEN(_g_) (((_g_) & GENMASK(1, 0)) << 28)
76 /* Display HPD Request bits */
77 #define PMC_USB_DP_HPD_IRQ BIT(5)
78 #define PMC_USB_DP_HPD_LVL BIT(6)
85 struct typec_mux *typec_mux;
86 struct typec_switch *typec_sw;
87 struct usb_role_switch *usb_sw;
89 enum typec_orientation orientation;
99 struct pmc_usb_port *port;
102 static int pmc_usb_command(struct pmc_usb_port *port, u8 *msg, u32 len)
107 * Error bit will always be 0 with the USBC command.
108 * Status can be checked from the response message.
110 intel_pmc_ipc_command(PMC_USBC_CMD, 0, msg, len,
111 (void *)response, 1);
114 if (response[2] & BIT(1))
123 pmc_usb_mux_dp_hpd(struct pmc_usb_port *port, struct typec_mux_state *state)
125 struct typec_displayport_data *data = state->data;
128 msg[0] = PMC_USB_DP_HPD;
129 msg[0] |= port->usb3_port << PMC_USB_MSG_USB3_PORT_SHIFT;
131 msg[1] = PMC_USB_DP_HPD_IRQ;
133 if (data->status & DP_STATUS_HPD_STATE)
134 msg[1] |= PMC_USB_DP_HPD_LVL;
136 return pmc_usb_command(port, msg, sizeof(msg));
140 pmc_usb_mux_dp(struct pmc_usb_port *port, struct typec_mux_state *state)
142 struct typec_displayport_data *data = state->data;
143 struct altmode_req req = { };
145 if (data->status & DP_STATUS_IRQ_HPD)
146 return pmc_usb_mux_dp_hpd(port, state);
148 req.usage = PMC_USB_ALT_MODE;
149 req.usage |= port->usb3_port << PMC_USB_MSG_USB3_PORT_SHIFT;
150 req.mode_type = PMC_USB_MODE_TYPE_DP << PMC_USB_MODE_TYPE_SHIFT;
152 req.mode_data = (port->orientation - 1) << PMC_USB_ALTMODE_ORI_SHIFT;
153 req.mode_data |= (port->role - 1) << PMC_USB_ALTMODE_UFP_SHIFT;
154 req.mode_data |= (port->orientation - 1) << PMC_USB_ALTMODE_ORI_AUX_SHIFT;
155 req.mode_data |= (port->orientation - 1) << PMC_USB_ALTMODE_ORI_HSL_SHIFT;
157 req.mode_data |= (state->mode - TYPEC_STATE_MODAL) <<
158 PMC_USB_ALTMODE_DP_MODE_SHIFT;
160 return pmc_usb_command(port, (void *)&req, sizeof(req));
164 pmc_usb_mux_tbt(struct pmc_usb_port *port, struct typec_mux_state *state)
166 struct typec_thunderbolt_data *data = state->data;
167 u8 cable_speed = TBT_CABLE_SPEED(data->cable_mode);
168 struct altmode_req req = { };
170 req.usage = PMC_USB_ALT_MODE;
171 req.usage |= port->usb3_port << PMC_USB_MSG_USB3_PORT_SHIFT;
172 req.mode_type = PMC_USB_MODE_TYPE_TBT << PMC_USB_MODE_TYPE_SHIFT;
174 req.mode_data = (port->orientation - 1) << PMC_USB_ALTMODE_ORI_SHIFT;
175 req.mode_data |= (port->role - 1) << PMC_USB_ALTMODE_UFP_SHIFT;
176 req.mode_data |= (port->orientation - 1) << PMC_USB_ALTMODE_ORI_AUX_SHIFT;
177 req.mode_data |= (port->orientation - 1) << PMC_USB_ALTMODE_ORI_HSL_SHIFT;
179 if (TBT_ADAPTER(data->device_mode) == TBT_ADAPTER_TBT3)
180 req.mode_data |= PMC_USB_ALTMODE_TBT_TYPE;
182 if (data->cable_mode & TBT_CABLE_OPTICAL)
183 req.mode_data |= PMC_USB_ALTMODE_CABLE_TYPE;
185 if (data->cable_mode & TBT_CABLE_LINK_TRAINING)
186 req.mode_data |= PMC_USB_ALTMODE_ACTIVE_LINK;
188 if (data->enter_vdo & TBT_ENTER_MODE_ACTIVE_CABLE)
189 req.mode_data |= PMC_USB_ALTMODE_ACTIVE_CABLE;
191 req.mode_data |= PMC_USB_ALTMODE_CABLE_SPD(cable_speed);
193 return pmc_usb_command(port, (void *)&req, sizeof(req));
196 static int pmc_usb_mux_safe_state(struct pmc_usb_port *port)
200 msg = PMC_USB_SAFE_MODE;
201 msg |= port->usb3_port << PMC_USB_MSG_USB3_PORT_SHIFT;
203 return pmc_usb_command(port, &msg, sizeof(msg));
206 static int pmc_usb_connect(struct pmc_usb_port *port)
210 msg[0] = PMC_USB_CONNECT;
211 msg[0] |= port->usb3_port << PMC_USB_MSG_USB3_PORT_SHIFT;
213 msg[1] = port->usb2_port << PMC_USB_MSG_USB2_PORT_SHIFT;
214 msg[1] |= (port->orientation - 1) << PMC_USB_MSG_ORI_HSL_SHIFT;
215 msg[1] |= (port->orientation - 1) << PMC_USB_MSG_ORI_AUX_SHIFT;
217 return pmc_usb_command(port, msg, sizeof(msg));
220 static int pmc_usb_disconnect(struct pmc_usb_port *port)
224 msg[0] = PMC_USB_DISCONNECT;
225 msg[0] |= port->usb3_port << PMC_USB_MSG_USB3_PORT_SHIFT;
227 msg[1] = port->usb2_port << PMC_USB_MSG_USB2_PORT_SHIFT;
229 return pmc_usb_command(port, msg, sizeof(msg));
233 pmc_usb_mux_set(struct typec_mux *mux, struct typec_mux_state *state)
235 struct pmc_usb_port *port = typec_mux_get_drvdata(mux);
240 if (state->mode == TYPEC_STATE_SAFE)
241 return pmc_usb_mux_safe_state(port);
243 switch (state->alt->svid) {
244 case USB_TYPEC_TBT_SID:
245 return pmc_usb_mux_tbt(port, state);
246 case USB_TYPEC_DP_SID:
247 return pmc_usb_mux_dp(port, state);
253 static int pmc_usb_set_orientation(struct typec_switch *sw,
254 enum typec_orientation orientation)
256 struct pmc_usb_port *port = typec_switch_get_drvdata(sw);
258 if (port->orientation == orientation)
261 port->orientation = orientation;
264 if (orientation == TYPEC_ORIENTATION_NONE)
265 return pmc_usb_disconnect(port);
267 return pmc_usb_connect(port);
273 static int pmc_usb_set_role(struct usb_role_switch *sw, enum usb_role role)
275 struct pmc_usb_port *port = usb_role_switch_get_drvdata(sw);
277 if (port->role == role)
282 if (port->orientation) {
283 if (role == USB_ROLE_NONE)
284 return pmc_usb_disconnect(port);
286 return pmc_usb_connect(port);
292 static int pmc_usb_register_port(struct pmc_usb *pmc, int index,
293 struct fwnode_handle *fwnode)
295 struct pmc_usb_port *port = &pmc->port[index];
296 struct usb_role_switch_desc desc = { };
297 struct typec_switch_desc sw_desc = { };
298 struct typec_mux_desc mux_desc = { };
301 ret = fwnode_property_read_u8(fwnode, "usb2-port", &port->usb2_port);
305 ret = fwnode_property_read_u8(fwnode, "usb3-port", &port->usb3_port);
312 sw_desc.fwnode = fwnode;
313 sw_desc.drvdata = port;
314 sw_desc.name = fwnode_get_name(fwnode);
315 sw_desc.set = pmc_usb_set_orientation;
317 port->typec_sw = typec_switch_register(pmc->dev, &sw_desc);
318 if (IS_ERR(port->typec_sw))
319 return PTR_ERR(port->typec_sw);
321 mux_desc.fwnode = fwnode;
322 mux_desc.drvdata = port;
323 mux_desc.name = fwnode_get_name(fwnode);
324 mux_desc.set = pmc_usb_mux_set;
326 port->typec_mux = typec_mux_register(pmc->dev, &mux_desc);
327 if (IS_ERR(port->typec_mux)) {
328 ret = PTR_ERR(port->typec_mux);
329 goto err_unregister_switch;
332 desc.fwnode = fwnode;
333 desc.driver_data = port;
334 desc.name = fwnode_get_name(fwnode);
335 desc.set = pmc_usb_set_role;
337 port->usb_sw = usb_role_switch_register(pmc->dev, &desc);
338 if (IS_ERR(port->usb_sw)) {
339 ret = PTR_ERR(port->usb_sw);
340 goto err_unregister_mux;
346 typec_mux_unregister(port->typec_mux);
348 err_unregister_switch:
349 typec_switch_unregister(port->typec_sw);
354 static int pmc_usb_probe(struct platform_device *pdev)
356 struct fwnode_handle *fwnode = NULL;
361 pmc = devm_kzalloc(&pdev->dev, sizeof(*pmc), GFP_KERNEL);
365 device_for_each_child_node(&pdev->dev, fwnode)
368 pmc->port = devm_kcalloc(&pdev->dev, pmc->num_ports,
369 sizeof(struct pmc_usb_port), GFP_KERNEL);
373 pmc->dev = &pdev->dev;
376 * For every physical USB connector (USB2 and USB3 combo) there is a
377 * child ACPI device node under the PMC mux ACPI device object.
379 for (i = 0; i < pmc->num_ports; i++) {
380 fwnode = device_get_next_child_node(pmc->dev, fwnode);
384 ret = pmc_usb_register_port(pmc, i, fwnode);
386 goto err_remove_ports;
389 platform_set_drvdata(pdev, pmc);
394 for (i = 0; i < pmc->num_ports; i++) {
395 typec_switch_unregister(pmc->port[i].typec_sw);
396 typec_mux_unregister(pmc->port[i].typec_mux);
402 static int pmc_usb_remove(struct platform_device *pdev)
404 struct pmc_usb *pmc = platform_get_drvdata(pdev);
407 for (i = 0; i < pmc->num_ports; i++) {
408 typec_switch_unregister(pmc->port[i].typec_sw);
409 typec_mux_unregister(pmc->port[i].typec_mux);
415 static const struct acpi_device_id pmc_usb_acpi_ids[] = {
419 MODULE_DEVICE_TABLE(acpi, pmc_usb_acpi_ids);
421 static struct platform_driver pmc_usb_driver = {
423 .name = "intel_pmc_usb",
424 .acpi_match_table = ACPI_PTR(pmc_usb_acpi_ids),
426 .probe = pmc_usb_probe,
427 .remove = pmc_usb_remove,
430 module_platform_driver(pmc_usb_driver);
432 MODULE_AUTHOR("Heikki Krogerus <heikki.krogerus@linux.intel.com>");
433 MODULE_LICENSE("GPL v2");
434 MODULE_DESCRIPTION("Intel PMC USB mux control");