1 // SPDX-License-Identifier: GPL-2.0+
3  * PCI Express Hot Plug Controller Driver
6  * Copyright (C) 2001 Greg Kroah-Hartman (greg@kroah.com)
8  * Copyright (C) 2003-2004 Intel Corporation
25    hotplug controller logic
31 static void set_slot_off(struct controller *ctrl)  in set_slot_off()
34 	 * Turn off slot, turn on attention indicator, turn off power  in set_slot_off()
41 		 * After turning power off, we must wait for at least 1 second  in set_slot_off()
42 		 * before taking any action that relies on power having been  in set_slot_off()
53  * board_added - Called after a board has been added to the system.
54  * @ctrl: PCIe hotplug controller where board is added
56  * Turns power on for the board.
59 static int board_added(struct controller *ctrl)  in board_added()
62 	struct pci_bus *parent = ctrl->pcie->port->subordinate;  in board_added()
65 		/* Power on slot */  in board_added()
79 	/* Check for a power fault */  in board_added()
80 	if (ctrl->power_fault_detected || pciehp_query_power_fault(ctrl)) {  in board_added()
81 		ctrl_err(ctrl, "Slot(%s): Power fault\n", slot_name(ctrl));  in board_added()
82 		retval = -EIO;  in board_added()
88 		if (retval != -EEXIST) {  in board_added()
90 				 pci_domain_nr(parent), parent->number);  in board_added()
105  * remove_board - Turn off slot and Power Indicator
106  * @ctrl: PCIe hotplug controller where board is being removed
109 static void remove_board(struct controller *ctrl, bool safe_removal)  in remove_board()
117 		 * After turning power off, we must wait for at least 1 second  in remove_board()
118 		 * before taking any action that relies on power having been  in remove_board()
123 		/* Ignore link or presence changes caused by power off */  in remove_board()
125 			   &ctrl->pending_events);  in remove_board()
132 static int pciehp_enable_slot(struct controller *ctrl);
133 static int pciehp_disable_slot(struct controller *ctrl, bool safe_removal);
135 void pciehp_request(struct controller *ctrl, int action)  in pciehp_request()
137 	atomic_or(action, &ctrl->pending_events);  in pciehp_request()
139 		irq_wake_thread(ctrl->pcie->irq, ctrl);  in pciehp_request()
144 	struct controller *ctrl = container_of(work, struct controller,  in pciehp_queue_pushbutton_work()
147 	mutex_lock(&ctrl->state_lock);  in pciehp_queue_pushbutton_work()
148 	switch (ctrl->state) {  in pciehp_queue_pushbutton_work()
158 	mutex_unlock(&ctrl->state_lock);  in pciehp_queue_pushbutton_work()
161 void pciehp_handle_button_press(struct controller *ctrl)  in pciehp_handle_button_press()
163 	mutex_lock(&ctrl->state_lock);  in pciehp_handle_button_press()
164 	switch (ctrl->state) {  in pciehp_handle_button_press()
167 		if (ctrl->state == ON_STATE) {  in pciehp_handle_button_press()
168 			ctrl->state = BLINKINGOFF_STATE;  in pciehp_handle_button_press()
169 			ctrl_info(ctrl, "Slot(%s): Button press: will power off in 5 sec\n",  in pciehp_handle_button_press()
172 			ctrl->state = BLINKINGON_STATE;  in pciehp_handle_button_press()
173 			ctrl_info(ctrl, "Slot(%s): Button press: will power on in 5 sec\n",  in pciehp_handle_button_press()
176 		/* blink power indicator and turn off attention */  in pciehp_handle_button_press()
179 		schedule_delayed_work(&ctrl->button_work, 5 * HZ);  in pciehp_handle_button_press()
186 		 * expires to cancel hot-add or hot-remove  in pciehp_handle_button_press()
188 		cancel_delayed_work(&ctrl->button_work);  in pciehp_handle_button_press()
189 		if (ctrl->state == BLINKINGOFF_STATE) {  in pciehp_handle_button_press()
190 			ctrl->state = ON_STATE;  in pciehp_handle_button_press()
193 			ctrl_info(ctrl, "Slot(%s): Button press: canceling request to power off\n",  in pciehp_handle_button_press()
196 			ctrl->state = OFF_STATE;  in pciehp_handle_button_press()
199 			ctrl_info(ctrl, "Slot(%s): Button press: canceling request to power on\n",  in pciehp_handle_button_press()
205 			 slot_name(ctrl), ctrl->state);  in pciehp_handle_button_press()
208 	mutex_unlock(&ctrl->state_lock);  in pciehp_handle_button_press()
211 void pciehp_handle_disable_request(struct controller *ctrl)  in pciehp_handle_disable_request()
213 	mutex_lock(&ctrl->state_lock);  in pciehp_handle_disable_request()
214 	switch (ctrl->state) {  in pciehp_handle_disable_request()
217 		cancel_delayed_work(&ctrl->button_work);  in pciehp_handle_disable_request()
220 	ctrl->state = POWEROFF_STATE;  in pciehp_handle_disable_request()
221 	mutex_unlock(&ctrl->state_lock);  in pciehp_handle_disable_request()
223 	ctrl->request_result = pciehp_disable_slot(ctrl, SAFE_REMOVAL);  in pciehp_handle_disable_request()
226 void pciehp_handle_presence_or_link_change(struct controller *ctrl, u32 events)  in pciehp_handle_presence_or_link_change()
234 	mutex_lock(&ctrl->state_lock);  in pciehp_handle_presence_or_link_change()
235 	switch (ctrl->state) {  in pciehp_handle_presence_or_link_change()
237 		cancel_delayed_work(&ctrl->button_work);  in pciehp_handle_presence_or_link_change()
240 		ctrl->state = POWEROFF_STATE;  in pciehp_handle_presence_or_link_change()
241 		mutex_unlock(&ctrl->state_lock);  in pciehp_handle_presence_or_link_change()
251 		mutex_unlock(&ctrl->state_lock);  in pciehp_handle_presence_or_link_change()
256 	mutex_lock(&ctrl->state_lock);  in pciehp_handle_presence_or_link_change()
260 		if (ctrl->state == BLINKINGON_STATE) {  in pciehp_handle_presence_or_link_change()
261 			ctrl->state = OFF_STATE;  in pciehp_handle_presence_or_link_change()
262 			cancel_delayed_work(&ctrl->button_work);  in pciehp_handle_presence_or_link_change()
268 		mutex_unlock(&ctrl->state_lock);  in pciehp_handle_presence_or_link_change()
272 	switch (ctrl->state) {  in pciehp_handle_presence_or_link_change()
274 		cancel_delayed_work(&ctrl->button_work);  in pciehp_handle_presence_or_link_change()
277 		ctrl->state = POWERON_STATE;  in pciehp_handle_presence_or_link_change()
278 		mutex_unlock(&ctrl->state_lock);  in pciehp_handle_presence_or_link_change()
285 		ctrl->request_result = pciehp_enable_slot(ctrl);  in pciehp_handle_presence_or_link_change()
288 		mutex_unlock(&ctrl->state_lock);  in pciehp_handle_presence_or_link_change()
293 static int __pciehp_enable_slot(struct controller *ctrl)  in __pciehp_enable_slot()
302 			return -ENODEV;  in __pciehp_enable_slot()
318 static int pciehp_enable_slot(struct controller *ctrl)  in pciehp_enable_slot()
322 	pm_runtime_get_sync(&ctrl->pcie->port->dev);  in pciehp_enable_slot()
328 	pm_runtime_put(&ctrl->pcie->port->dev);  in pciehp_enable_slot()
330 	mutex_lock(&ctrl->state_lock);  in pciehp_enable_slot()
331 	ctrl->state = ret ? OFF_STATE : ON_STATE;  in pciehp_enable_slot()
332 	mutex_unlock(&ctrl->state_lock);  in pciehp_enable_slot()
337 static int __pciehp_disable_slot(struct controller *ctrl, bool safe_removal)  in __pciehp_disable_slot()
346 			return -EINVAL;  in __pciehp_disable_slot()
354 static int pciehp_disable_slot(struct controller *ctrl, bool safe_removal)  in pciehp_disable_slot()
358 	pm_runtime_get_sync(&ctrl->pcie->port->dev);  in pciehp_disable_slot()
360 	pm_runtime_put(&ctrl->pcie->port->dev);  in pciehp_disable_slot()
362 	mutex_lock(&ctrl->state_lock);  in pciehp_disable_slot()
363 	ctrl->state = OFF_STATE;  in pciehp_disable_slot()
364 	mutex_unlock(&ctrl->state_lock);  in pciehp_disable_slot()
371 	struct controller *ctrl = to_ctrl(hotplug_slot);  in pciehp_sysfs_enable_slot()
373 	mutex_lock(&ctrl->state_lock);  in pciehp_sysfs_enable_slot()
374 	switch (ctrl->state) {  in pciehp_sysfs_enable_slot()
377 		mutex_unlock(&ctrl->state_lock);  in pciehp_sysfs_enable_slot()
379 		 * The IRQ thread becomes a no-op if the user pulls out the  in pciehp_sysfs_enable_slot()
380 		 * card before the thread wakes up, so initialize to -ENODEV.  in pciehp_sysfs_enable_slot()
382 		ctrl->request_result = -ENODEV;  in pciehp_sysfs_enable_slot()
384 		wait_event(ctrl->requester,  in pciehp_sysfs_enable_slot()
385 			   !atomic_read(&ctrl->pending_events) &&  in pciehp_sysfs_enable_slot()
386 			   !ctrl->ist_running);  in pciehp_sysfs_enable_slot()
387 		return ctrl->request_result;  in pciehp_sysfs_enable_slot()
400 			 slot_name(ctrl), ctrl->state);  in pciehp_sysfs_enable_slot()
403 	mutex_unlock(&ctrl->state_lock);  in pciehp_sysfs_enable_slot()
405 	return -ENODEV;  in pciehp_sysfs_enable_slot()
410 	struct controller *ctrl = to_ctrl(hotplug_slot);  in pciehp_sysfs_disable_slot()
412 	mutex_lock(&ctrl->state_lock);  in pciehp_sysfs_disable_slot()
413 	switch (ctrl->state) {  in pciehp_sysfs_disable_slot()
416 		mutex_unlock(&ctrl->state_lock);  in pciehp_sysfs_disable_slot()
418 		wait_event(ctrl->requester,  in pciehp_sysfs_disable_slot()
419 			   !atomic_read(&ctrl->pending_events) &&  in pciehp_sysfs_disable_slot()
420 			   !ctrl->ist_running);  in pciehp_sysfs_disable_slot()
421 		return ctrl->request_result;  in pciehp_sysfs_disable_slot()
434 			 slot_name(ctrl), ctrl->state);  in pciehp_sysfs_disable_slot()
437 	mutex_unlock(&ctrl->state_lock);  in pciehp_sysfs_disable_slot()
439 	return -ENODEV;  in pciehp_sysfs_disable_slot()