1 // SPDX-License-Identifier: GPL-2.0+
3  * PCI Express Hot Plug Controller Driver
6  * Copyright (C) 2001 Greg Kroah-Hartman ([email protected])
8  * Copyright (C) 2003-2004 Intel Corporation
27    hotplug controller logic
33 static void set_slot_off(struct controller *ctrl)  in set_slot_off()
36 	 * Turn off slot, turn on attention indicator, turn off power  in set_slot_off()
43 		 * After turning power off, we must wait for at least 1 second  in set_slot_off()
44 		 * before taking any action that relies on power having been  in set_slot_off()
55  * board_added - Called after a board has been added to the system.
56  * @ctrl: PCIe hotplug controller where board is added
58  * Turns power on for the board.
61 static int board_added(struct controller *ctrl)  in board_added()
64 	struct pci_bus *parent = ctrl->pcie->port->subordinate;  in board_added()
67 		/* Power on slot */  in board_added()
81 	/* Check for a power fault */  in board_added()
82 	if (ctrl->power_fault_detected || pciehp_query_power_fault(ctrl)) {  in board_added()
83 		ctrl_err(ctrl, "Slot(%s): Power fault\n", slot_name(ctrl));  in board_added()
84 		retval = -EIO;  in board_added()
90 		if (retval != -EEXIST) {  in board_added()
92 				 pci_domain_nr(parent), parent->number);  in board_added()
107  * remove_board - Turn off slot and Power Indicator
108  * @ctrl: PCIe hotplug controller where board is being removed
111 static void remove_board(struct controller *ctrl, bool safe_removal)  in remove_board()
119 		 * After turning power off, we must wait for at least 1 second  in remove_board()
120 		 * before taking any action that relies on power having been  in remove_board()
125 		/* Ignore link or presence changes caused by power off */  in remove_board()
127 			   &ctrl->pending_events);  in remove_board()
134 	pcie_reset_lbms_count(ctrl->pcie->port);  in remove_board()
137 static int pciehp_enable_slot(struct controller *ctrl);
138 static int pciehp_disable_slot(struct controller *ctrl, bool safe_removal);
140 void pciehp_request(struct controller *ctrl, int action)  in pciehp_request()
142 	atomic_or(action, &ctrl->pending_events);  in pciehp_request()
144 		irq_wake_thread(ctrl->pcie->irq, ctrl);  in pciehp_request()
149 	struct controller *ctrl = container_of(work, struct controller,  in pciehp_queue_pushbutton_work()
152 	mutex_lock(&ctrl->state_lock);  in pciehp_queue_pushbutton_work()
153 	switch (ctrl->state) {  in pciehp_queue_pushbutton_work()
163 	mutex_unlock(&ctrl->state_lock);  in pciehp_queue_pushbutton_work()
166 void pciehp_handle_button_press(struct controller *ctrl)  in pciehp_handle_button_press()
168 	mutex_lock(&ctrl->state_lock);  in pciehp_handle_button_press()
169 	switch (ctrl->state) {  in pciehp_handle_button_press()
172 		if (ctrl->state == ON_STATE) {  in pciehp_handle_button_press()
173 			ctrl->state = BLINKINGOFF_STATE;  in pciehp_handle_button_press()
174 			ctrl_info(ctrl, "Slot(%s): Button press: will power off in 5 sec\n",  in pciehp_handle_button_press()
177 			ctrl->state = BLINKINGON_STATE;  in pciehp_handle_button_press()
178 			ctrl_info(ctrl, "Slot(%s): Button press: will power on in 5 sec\n",  in pciehp_handle_button_press()
181 		/* blink power indicator and turn off attention */  in pciehp_handle_button_press()
184 		schedule_delayed_work(&ctrl->button_work, 5 * HZ);  in pciehp_handle_button_press()
191 		 * expires to cancel hot-add or hot-remove  in pciehp_handle_button_press()
193 		cancel_delayed_work(&ctrl->button_work);  in pciehp_handle_button_press()
194 		if (ctrl->state == BLINKINGOFF_STATE) {  in pciehp_handle_button_press()
195 			ctrl->state = ON_STATE;  in pciehp_handle_button_press()
198 			ctrl_info(ctrl, "Slot(%s): Button press: canceling request to power off\n",  in pciehp_handle_button_press()
201 			ctrl->state = OFF_STATE;  in pciehp_handle_button_press()
204 			ctrl_info(ctrl, "Slot(%s): Button press: canceling request to power on\n",  in pciehp_handle_button_press()
210 			 slot_name(ctrl), ctrl->state);  in pciehp_handle_button_press()
213 	mutex_unlock(&ctrl->state_lock);  in pciehp_handle_button_press()
216 void pciehp_handle_disable_request(struct controller *ctrl)  in pciehp_handle_disable_request()
218 	mutex_lock(&ctrl->state_lock);  in pciehp_handle_disable_request()
219 	switch (ctrl->state) {  in pciehp_handle_disable_request()
222 		cancel_delayed_work(&ctrl->button_work);  in pciehp_handle_disable_request()
225 	ctrl->state = POWEROFF_STATE;  in pciehp_handle_disable_request()
226 	mutex_unlock(&ctrl->state_lock);  in pciehp_handle_disable_request()
228 	ctrl->request_result = pciehp_disable_slot(ctrl, SAFE_REMOVAL);  in pciehp_handle_disable_request()
231 void pciehp_handle_presence_or_link_change(struct controller *ctrl, u32 events)  in pciehp_handle_presence_or_link_change()
239 	mutex_lock(&ctrl->state_lock);  in pciehp_handle_presence_or_link_change()
240 	switch (ctrl->state) {  in pciehp_handle_presence_or_link_change()
242 		cancel_delayed_work(&ctrl->button_work);  in pciehp_handle_presence_or_link_change()
245 		ctrl->state = POWEROFF_STATE;  in pciehp_handle_presence_or_link_change()
246 		mutex_unlock(&ctrl->state_lock);  in pciehp_handle_presence_or_link_change()
256 		mutex_unlock(&ctrl->state_lock);  in pciehp_handle_presence_or_link_change()
261 	mutex_lock(&ctrl->state_lock);  in pciehp_handle_presence_or_link_change()
265 		if (ctrl->state == BLINKINGON_STATE) {  in pciehp_handle_presence_or_link_change()
266 			ctrl->state = OFF_STATE;  in pciehp_handle_presence_or_link_change()
267 			cancel_delayed_work(&ctrl->button_work);  in pciehp_handle_presence_or_link_change()
273 		mutex_unlock(&ctrl->state_lock);  in pciehp_handle_presence_or_link_change()
277 	switch (ctrl->state) {  in pciehp_handle_presence_or_link_change()
279 		cancel_delayed_work(&ctrl->button_work);  in pciehp_handle_presence_or_link_change()
282 		ctrl->state = POWERON_STATE;  in pciehp_handle_presence_or_link_change()
283 		mutex_unlock(&ctrl->state_lock);  in pciehp_handle_presence_or_link_change()
290 		ctrl->request_result = pciehp_enable_slot(ctrl);  in pciehp_handle_presence_or_link_change()
293 		mutex_unlock(&ctrl->state_lock);  in pciehp_handle_presence_or_link_change()
298 static int __pciehp_enable_slot(struct controller *ctrl)  in __pciehp_enable_slot()
307 			return -ENODEV;  in __pciehp_enable_slot()
323 static int pciehp_enable_slot(struct controller *ctrl)  in pciehp_enable_slot()
327 	pm_runtime_get_sync(&ctrl->pcie->port->dev);  in pciehp_enable_slot()
333 	pm_runtime_put(&ctrl->pcie->port->dev);  in pciehp_enable_slot()
335 	mutex_lock(&ctrl->state_lock);  in pciehp_enable_slot()
336 	ctrl->state = ret ? OFF_STATE : ON_STATE;  in pciehp_enable_slot()
337 	mutex_unlock(&ctrl->state_lock);  in pciehp_enable_slot()
342 static int __pciehp_disable_slot(struct controller *ctrl, bool safe_removal)  in __pciehp_disable_slot()
351 			return -EINVAL;  in __pciehp_disable_slot()
359 static int pciehp_disable_slot(struct controller *ctrl, bool safe_removal)  in pciehp_disable_slot()
363 	pm_runtime_get_sync(&ctrl->pcie->port->dev);  in pciehp_disable_slot()
365 	pm_runtime_put(&ctrl->pcie->port->dev);  in pciehp_disable_slot()
367 	mutex_lock(&ctrl->state_lock);  in pciehp_disable_slot()
368 	ctrl->state = OFF_STATE;  in pciehp_disable_slot()
369 	mutex_unlock(&ctrl->state_lock);  in pciehp_disable_slot()
376 	struct controller *ctrl = to_ctrl(hotplug_slot);  in pciehp_sysfs_enable_slot()
378 	mutex_lock(&ctrl->state_lock);  in pciehp_sysfs_enable_slot()
379 	switch (ctrl->state) {  in pciehp_sysfs_enable_slot()
382 		mutex_unlock(&ctrl->state_lock);  in pciehp_sysfs_enable_slot()
384 		 * The IRQ thread becomes a no-op if the user pulls out the  in pciehp_sysfs_enable_slot()
385 		 * card before the thread wakes up, so initialize to -ENODEV.  in pciehp_sysfs_enable_slot()
387 		ctrl->request_result = -ENODEV;  in pciehp_sysfs_enable_slot()
389 		wait_event(ctrl->requester,  in pciehp_sysfs_enable_slot()
390 			   !atomic_read(&ctrl->pending_events) &&  in pciehp_sysfs_enable_slot()
391 			   !ctrl->ist_running);  in pciehp_sysfs_enable_slot()
392 		return ctrl->request_result;  in pciehp_sysfs_enable_slot()
405 			 slot_name(ctrl), ctrl->state);  in pciehp_sysfs_enable_slot()
408 	mutex_unlock(&ctrl->state_lock);  in pciehp_sysfs_enable_slot()
410 	return -ENODEV;  in pciehp_sysfs_enable_slot()
415 	struct controller *ctrl = to_ctrl(hotplug_slot);  in pciehp_sysfs_disable_slot()
417 	mutex_lock(&ctrl->state_lock);  in pciehp_sysfs_disable_slot()
418 	switch (ctrl->state) {  in pciehp_sysfs_disable_slot()
421 		mutex_unlock(&ctrl->state_lock);  in pciehp_sysfs_disable_slot()
423 		wait_event(ctrl->requester,  in pciehp_sysfs_disable_slot()
424 			   !atomic_read(&ctrl->pending_events) &&  in pciehp_sysfs_disable_slot()
425 			   !ctrl->ist_running);  in pciehp_sysfs_disable_slot()
426 		return ctrl->request_result;  in pciehp_sysfs_disable_slot()
439 			 slot_name(ctrl), ctrl->state);  in pciehp_sysfs_disable_slot()
442 	mutex_unlock(&ctrl->state_lock);  in pciehp_sysfs_disable_slot()
444 	return -ENODEV;  in pciehp_sysfs_disable_slot()