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199 lines
7.9 KiB
199 lines
7.9 KiB
/* SPDX-License-Identifier: GPL-2.0+ */ |
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/* |
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* PCI Express Hot Plug Controller Driver |
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* |
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* Copyright (C) 1995,2001 Compaq Computer Corporation |
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* Copyright (C) 2001 Greg Kroah-Hartman ([email protected]) |
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* Copyright (C) 2001 IBM Corp. |
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* Copyright (C) 2003-2004 Intel Corporation |
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* |
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* All rights reserved. |
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* |
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* Send feedback to <[email protected]>, <[email protected]> |
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* |
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*/ |
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#ifndef _PCIEHP_H |
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#define _PCIEHP_H |
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#include <linux/types.h> |
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#include <linux/pci.h> |
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#include <linux/pci_hotplug.h> |
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#include <linux/delay.h> |
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#include <linux/mutex.h> |
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#include <linux/rwsem.h> |
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#include <linux/workqueue.h> |
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#include "../pcie/portdrv.h" |
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extern bool pciehp_poll_mode; |
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extern int pciehp_poll_time; |
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/* |
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* Set CONFIG_DYNAMIC_DEBUG=y and boot with 'dyndbg="file pciehp* +p"' to |
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* enable debug messages. |
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*/ |
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#define ctrl_dbg(ctrl, format, arg...) \ |
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pci_dbg(ctrl->pcie->port, format, ## arg) |
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#define ctrl_err(ctrl, format, arg...) \ |
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pci_err(ctrl->pcie->port, format, ## arg) |
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#define ctrl_info(ctrl, format, arg...) \ |
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pci_info(ctrl->pcie->port, format, ## arg) |
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#define ctrl_warn(ctrl, format, arg...) \ |
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pci_warn(ctrl->pcie->port, format, ## arg) |
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#define SLOT_NAME_SIZE 10 |
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/** |
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* struct controller - PCIe hotplug controller |
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* @pcie: pointer to the controller's PCIe port service device |
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* @slot_cap: cached copy of the Slot Capabilities register |
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* @slot_ctrl: cached copy of the Slot Control register |
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* @ctrl_lock: serializes writes to the Slot Control register |
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* @cmd_started: jiffies when the Slot Control register was last written; |
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* the next write is allowed 1 second later, absent a Command Completed |
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* interrupt (PCIe r4.0, sec 6.7.3.2) |
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* @cmd_busy: flag set on Slot Control register write, cleared by IRQ handler |
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* on reception of a Command Completed event |
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* @queue: wait queue to wake up on reception of a Command Completed event, |
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* used for synchronous writes to the Slot Control register |
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* @pending_events: used by the IRQ handler to save events retrieved from the |
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* Slot Status register for later consumption by the IRQ thread |
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* @notification_enabled: whether the IRQ was requested successfully |
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* @power_fault_detected: whether a power fault was detected by the hardware |
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* that has not yet been cleared by the user |
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* @poll_thread: thread to poll for slot events if no IRQ is available, |
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* enabled with pciehp_poll_mode module parameter |
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* @state: current state machine position |
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* @state_lock: protects reads and writes of @state; |
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* protects scheduling, execution and cancellation of @button_work |
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* @button_work: work item to turn the slot on or off after 5 seconds |
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* in response to an Attention Button press |
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* @hotplug_slot: structure registered with the PCI hotplug core |
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* @reset_lock: prevents access to the Data Link Layer Link Active bit in the |
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* Link Status register and to the Presence Detect State bit in the Slot |
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* Status register during a slot reset which may cause them to flap |
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* @ist_running: flag to keep user request waiting while IRQ thread is running |
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* @request_result: result of last user request submitted to the IRQ thread |
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* @requester: wait queue to wake up on completion of user request, |
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* used for synchronous slot enable/disable request via sysfs |
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* |
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* PCIe hotplug has a 1:1 relationship between controller and slot, hence |
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* unlike other drivers, the two aren't represented by separate structures. |
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*/ |
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struct controller { |
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struct pcie_device *pcie; |
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u32 slot_cap; /* capabilities and quirks */ |
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unsigned int inband_presence_disabled:1; |
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u16 slot_ctrl; /* control register access */ |
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struct mutex ctrl_lock; |
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unsigned long cmd_started; |
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unsigned int cmd_busy:1; |
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wait_queue_head_t queue; |
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atomic_t pending_events; /* event handling */ |
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unsigned int notification_enabled:1; |
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unsigned int power_fault_detected; |
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struct task_struct *poll_thread; |
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u8 state; /* state machine */ |
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struct mutex state_lock; |
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struct delayed_work button_work; |
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struct hotplug_slot hotplug_slot; /* hotplug core interface */ |
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struct rw_semaphore reset_lock; |
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unsigned int ist_running; |
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int request_result; |
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wait_queue_head_t requester; |
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}; |
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/** |
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* DOC: Slot state |
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* |
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* @OFF_STATE: slot is powered off, no subordinate devices are enumerated |
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* @BLINKINGON_STATE: slot will be powered on after the 5 second delay, |
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* Power Indicator is blinking |
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* @BLINKINGOFF_STATE: slot will be powered off after the 5 second delay, |
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* Power Indicator is blinking |
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* @POWERON_STATE: slot is currently powering on |
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* @POWEROFF_STATE: slot is currently powering off |
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* @ON_STATE: slot is powered on, subordinate devices have been enumerated |
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*/ |
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#define OFF_STATE 0 |
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#define BLINKINGON_STATE 1 |
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#define BLINKINGOFF_STATE 2 |
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#define POWERON_STATE 3 |
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#define POWEROFF_STATE 4 |
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#define ON_STATE 5 |
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/** |
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* DOC: Flags to request an action from the IRQ thread |
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* |
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* These are stored together with events read from the Slot Status register, |
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* hence must be greater than its 16-bit width. |
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* |
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* %DISABLE_SLOT: Disable the slot in response to a user request via sysfs or |
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* an Attention Button press after the 5 second delay |
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* %RERUN_ISR: Used by the IRQ handler to inform the IRQ thread that the |
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* hotplug port was inaccessible when the interrupt occurred, requiring |
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* that the IRQ handler is rerun by the IRQ thread after it has made the |
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* hotplug port accessible by runtime resuming its parents to D0 |
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*/ |
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#define DISABLE_SLOT (1 << 16) |
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#define RERUN_ISR (1 << 17) |
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#define ATTN_BUTTN(ctrl) ((ctrl)->slot_cap & PCI_EXP_SLTCAP_ABP) |
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#define POWER_CTRL(ctrl) ((ctrl)->slot_cap & PCI_EXP_SLTCAP_PCP) |
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#define MRL_SENS(ctrl) ((ctrl)->slot_cap & PCI_EXP_SLTCAP_MRLSP) |
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#define ATTN_LED(ctrl) ((ctrl)->slot_cap & PCI_EXP_SLTCAP_AIP) |
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#define PWR_LED(ctrl) ((ctrl)->slot_cap & PCI_EXP_SLTCAP_PIP) |
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#define NO_CMD_CMPL(ctrl) ((ctrl)->slot_cap & PCI_EXP_SLTCAP_NCCS) |
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#define PSN(ctrl) (((ctrl)->slot_cap & PCI_EXP_SLTCAP_PSN) >> 19) |
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void pciehp_request(struct controller *ctrl, int action); |
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void pciehp_handle_button_press(struct controller *ctrl); |
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void pciehp_handle_disable_request(struct controller *ctrl); |
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void pciehp_handle_presence_or_link_change(struct controller *ctrl, u32 events); |
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int pciehp_configure_device(struct controller *ctrl); |
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void pciehp_unconfigure_device(struct controller *ctrl, bool presence); |
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void pciehp_queue_pushbutton_work(struct work_struct *work); |
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struct controller *pcie_init(struct pcie_device *dev); |
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int pcie_init_notification(struct controller *ctrl); |
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void pcie_shutdown_notification(struct controller *ctrl); |
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void pcie_clear_hotplug_events(struct controller *ctrl); |
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void pcie_enable_interrupt(struct controller *ctrl); |
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void pcie_disable_interrupt(struct controller *ctrl); |
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int pciehp_power_on_slot(struct controller *ctrl); |
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void pciehp_power_off_slot(struct controller *ctrl); |
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void pciehp_get_power_status(struct controller *ctrl, u8 *status); |
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#define INDICATOR_NOOP -1 /* Leave indicator unchanged */ |
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void pciehp_set_indicators(struct controller *ctrl, int pwr, int attn); |
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void pciehp_get_latch_status(struct controller *ctrl, u8 *status); |
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int pciehp_query_power_fault(struct controller *ctrl); |
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int pciehp_card_present(struct controller *ctrl); |
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int pciehp_card_present_or_link_active(struct controller *ctrl); |
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int pciehp_check_link_status(struct controller *ctrl); |
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int pciehp_check_link_active(struct controller *ctrl); |
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void pciehp_release_ctrl(struct controller *ctrl); |
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int pciehp_sysfs_enable_slot(struct hotplug_slot *hotplug_slot); |
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int pciehp_sysfs_disable_slot(struct hotplug_slot *hotplug_slot); |
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int pciehp_reset_slot(struct hotplug_slot *hotplug_slot, int probe); |
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int pciehp_get_attention_status(struct hotplug_slot *hotplug_slot, u8 *status); |
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int pciehp_set_raw_indicator_status(struct hotplug_slot *h_slot, u8 status); |
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int pciehp_get_raw_indicator_status(struct hotplug_slot *h_slot, u8 *status); |
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static inline const char *slot_name(struct controller *ctrl) |
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{ |
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return hotplug_slot_name(&ctrl->hotplug_slot); |
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} |
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static inline struct controller *to_ctrl(struct hotplug_slot *hotplug_slot) |
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{ |
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return container_of(hotplug_slot, struct controller, hotplug_slot); |
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} |
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#endif /* _PCIEHP_H */
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