/* SPDX-License-Identifier: GPL-2.0+ */ /* * PCI Express Hot Plug Controller Driver * * Copyright (C) 1995,2001 Compaq Computer Corporation * Copyright (C) 2001 Greg Kroah-Hartman ([email protected]) * Copyright (C) 2001 IBM Corp. * Copyright (C) 2003-2004 Intel Corporation * * All rights reserved. * * Send feedback to <[email protected]>, <[email protected]> * */ #ifndef _PCIEHP_H #define _PCIEHP_H #include <linux/types.h> #include <linux/pci.h> #include <linux/pci_hotplug.h> #include <linux/delay.h> #include <linux/mutex.h> #include <linux/rwsem.h> #include <linux/workqueue.h> #include "../pcie/portdrv.h" extern bool pciehp_poll_mode; extern int pciehp_poll_time; /* * Set CONFIG_DYNAMIC_DEBUG=y and boot with 'dyndbg="file pciehp* +p"' to * enable debug messages. */ #define ctrl_dbg(ctrl, format, arg...) … #define ctrl_err(ctrl, format, arg...) … #define ctrl_info(ctrl, format, arg...) … #define ctrl_warn(ctrl, format, arg...) … #define SLOT_NAME_SIZE … /** * struct controller - PCIe hotplug controller * @pcie: pointer to the controller's PCIe port service device * @dsn: cached copy of Device Serial Number of Function 0 in the hotplug slot * (PCIe r6.2 sec 7.9.3); used to determine whether a hotplugged device * was replaced with a different one during system sleep * @slot_cap: cached copy of the Slot Capabilities register * @inband_presence_disabled: In-Band Presence Detect Disable supported by * controller and disabled per spec recommendation (PCIe r5.0, appendix I * implementation note) * @slot_ctrl: cached copy of the Slot Control register * @ctrl_lock: serializes writes to the Slot Control register * @cmd_started: jiffies when the Slot Control register was last written; * the next write is allowed 1 second later, absent a Command Completed * interrupt (PCIe r4.0, sec 6.7.3.2) * @cmd_busy: flag set on Slot Control register write, cleared by IRQ handler * on reception of a Command Completed event * @queue: wait queue to wake up on reception of a Command Completed event, * used for synchronous writes to the Slot Control register * @pending_events: used by the IRQ handler to save events retrieved from the * Slot Status register for later consumption by the IRQ thread * @notification_enabled: whether the IRQ was requested successfully * @power_fault_detected: whether a power fault was detected by the hardware * that has not yet been cleared by the user * @poll_thread: thread to poll for slot events if no IRQ is available, * enabled with pciehp_poll_mode module parameter * @state: current state machine position * @state_lock: protects reads and writes of @state; * protects scheduling, execution and cancellation of @button_work * @button_work: work item to turn the slot on or off after 5 seconds * in response to an Attention Button press * @hotplug_slot: structure registered with the PCI hotplug core * @reset_lock: prevents access to the Data Link Layer Link Active bit in the * Link Status register and to the Presence Detect State bit in the Slot * Status register during a slot reset which may cause them to flap * @depth: Number of additional hotplug ports in the path to the root bus, * used as lock subclass for @reset_lock * @ist_running: flag to keep user request waiting while IRQ thread is running * @request_result: result of last user request submitted to the IRQ thread * @requester: wait queue to wake up on completion of user request, * used for synchronous slot enable/disable request via sysfs * * PCIe hotplug has a 1:1 relationship between controller and slot, hence * unlike other drivers, the two aren't represented by separate structures. */ struct controller { … }; /** * DOC: Slot state * * @OFF_STATE: slot is powered off, no subordinate devices are enumerated * @BLINKINGON_STATE: slot will be powered on after the 5 second delay, * Power Indicator is blinking * @BLINKINGOFF_STATE: slot will be powered off after the 5 second delay, * Power Indicator is blinking * @POWERON_STATE: slot is currently powering on * @POWEROFF_STATE: slot is currently powering off * @ON_STATE: slot is powered on, subordinate devices have been enumerated */ #define OFF_STATE … #define BLINKINGON_STATE … #define BLINKINGOFF_STATE … #define POWERON_STATE … #define POWEROFF_STATE … #define ON_STATE … /** * DOC: Flags to request an action from the IRQ thread * * These are stored together with events read from the Slot Status register, * hence must be greater than its 16-bit width. * * %DISABLE_SLOT: Disable the slot in response to a user request via sysfs or * an Attention Button press after the 5 second delay * %RERUN_ISR: Used by the IRQ handler to inform the IRQ thread that the * hotplug port was inaccessible when the interrupt occurred, requiring * that the IRQ handler is rerun by the IRQ thread after it has made the * hotplug port accessible by runtime resuming its parents to D0 */ #define DISABLE_SLOT … #define RERUN_ISR … #define ATTN_BUTTN(ctrl) … #define POWER_CTRL(ctrl) … #define MRL_SENS(ctrl) … #define ATTN_LED(ctrl) … #define PWR_LED(ctrl) … #define NO_CMD_CMPL(ctrl) … #define PSN(ctrl) … void pciehp_request(struct controller *ctrl, int action); void pciehp_handle_button_press(struct controller *ctrl); void pciehp_handle_disable_request(struct controller *ctrl); void pciehp_handle_presence_or_link_change(struct controller *ctrl, u32 events); int pciehp_configure_device(struct controller *ctrl); void pciehp_unconfigure_device(struct controller *ctrl, bool presence); void pciehp_queue_pushbutton_work(struct work_struct *work); struct controller *pcie_init(struct pcie_device *dev); int pcie_init_notification(struct controller *ctrl); void pcie_shutdown_notification(struct controller *ctrl); void pcie_clear_hotplug_events(struct controller *ctrl); void pcie_enable_interrupt(struct controller *ctrl); void pcie_disable_interrupt(struct controller *ctrl); int pciehp_power_on_slot(struct controller *ctrl); void pciehp_power_off_slot(struct controller *ctrl); void pciehp_get_power_status(struct controller *ctrl, u8 *status); #define INDICATOR_NOOP … void pciehp_set_indicators(struct controller *ctrl, int pwr, int attn); void pciehp_get_latch_status(struct controller *ctrl, u8 *status); int pciehp_query_power_fault(struct controller *ctrl); int pciehp_card_present(struct controller *ctrl); int pciehp_card_present_or_link_active(struct controller *ctrl); int pciehp_check_link_status(struct controller *ctrl); int pciehp_check_link_active(struct controller *ctrl); void pciehp_release_ctrl(struct controller *ctrl); int pciehp_sysfs_enable_slot(struct hotplug_slot *hotplug_slot); int pciehp_sysfs_disable_slot(struct hotplug_slot *hotplug_slot); int pciehp_reset_slot(struct hotplug_slot *hotplug_slot, bool probe); int pciehp_get_attention_status(struct hotplug_slot *hotplug_slot, u8 *status); int pciehp_set_raw_indicator_status(struct hotplug_slot *h_slot, u8 status); int pciehp_get_raw_indicator_status(struct hotplug_slot *h_slot, u8 *status); int pciehp_slot_reset(struct pcie_device *dev); static inline const char *slot_name(struct controller *ctrl) { … } static inline struct controller *to_ctrl(struct hotplug_slot *hotplug_slot) { … } #endif /* _PCIEHP_H */
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