| /* 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 (greg@kroah.com) |
| * Copyright (C) 2001 IBM Corp. |
| * Copyright (C) 2003-2004 Intel Corporation |
| * |
| * All rights reserved. |
| * |
| * Send feedback to <greg@kroah.com>, <kristen.c.accardi@intel.com> |
| * |
| */ |
| #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/sched/signal.h> /* signal_pending() */ |
| #include <linux/mutex.h> |
| #include <linux/rwsem.h> |
| #include <linux/workqueue.h> |
| |
| #include "../pcie/portdrv.h" |
| |
| #define MY_NAME "pciehp" |
| |
| extern bool pciehp_poll_mode; |
| extern int pciehp_poll_time; |
| extern bool pciehp_debug; |
| |
| #define dbg(format, arg...) \ |
| do { \ |
| if (pciehp_debug) \ |
| printk(KERN_DEBUG "%s: " format, MY_NAME, ## arg); \ |
| } while (0) |
| #define err(format, arg...) \ |
| printk(KERN_ERR "%s: " format, MY_NAME, ## arg) |
| #define info(format, arg...) \ |
| printk(KERN_INFO "%s: " format, MY_NAME, ## arg) |
| #define warn(format, arg...) \ |
| printk(KERN_WARNING "%s: " format, MY_NAME, ## arg) |
| |
| #define ctrl_dbg(ctrl, format, arg...) \ |
| do { \ |
| if (pciehp_debug) \ |
| dev_printk(KERN_DEBUG, &ctrl->pcie->device, \ |
| format, ## arg); \ |
| } while (0) |
| #define ctrl_err(ctrl, format, arg...) \ |
| dev_err(&ctrl->pcie->device, format, ## arg) |
| #define ctrl_info(ctrl, format, arg...) \ |
| dev_info(&ctrl->pcie->device, format, ## arg) |
| #define ctrl_warn(ctrl, format, arg...) \ |
| dev_warn(&ctrl->pcie->device, format, ## arg) |
| |
| #define SLOT_NAME_SIZE 10 |
| |
| /** |
| * struct slot - PCIe hotplug slot |
| * @state: current state machine position |
| * @ctrl: pointer to the slot's controller structure |
| * @hotplug_slot: pointer to the structure registered with the PCI hotplug core |
| * @work: work item to turn the slot on or off after 5 seconds in response to |
| * an Attention Button press |
| * @lock: protects reads and writes of @state; |
| * protects scheduling, execution and cancellation of @work |
| */ |
| struct slot { |
| u8 state; |
| struct controller *ctrl; |
| struct hotplug_slot *hotplug_slot; |
| struct delayed_work work; |
| struct mutex lock; |
| }; |
| |
| /** |
| * struct controller - PCIe hotplug controller |
| * @ctrl_lock: serializes writes to the Slot Control register |
| * @pcie: pointer to the controller's PCIe port service device |
| * @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 |
| * @slot: pointer to the controller's slot structure |
| * @queue: wait queue to wake up on reception of a Command Completed event, |
| * used for synchronous writes to the Slot Control register |
| * @slot_cap: cached copy of the Slot Capabilities register |
| * @slot_ctrl: cached copy of the Slot Control register |
| * @poll_thread: thread to poll for slot events if no IRQ is available, |
| * enabled with pciehp_poll_mode module parameter |
| * @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 |
| * @link_active_reporting: cached copy of Data Link Layer Link Active Reporting |
| * Capable bit in Link Capabilities register; if this bit is zero, the |
| * Data Link Layer Link Active bit in the Link Status register will never |
| * be set and the driver is thus confined to wait 1 second before assuming |
| * the link to a hotplugged device is up and accessing it |
| * @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 |
| * @pending_events: used by the IRQ handler to save events retrieved from the |
| * Slot Status register for later consumption by the IRQ thread |
| * @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 |
| */ |
| struct controller { |
| struct mutex ctrl_lock; |
| struct pcie_device *pcie; |
| struct rw_semaphore reset_lock; |
| struct slot *slot; |
| wait_queue_head_t queue; |
| u32 slot_cap; |
| u16 slot_ctrl; |
| struct task_struct *poll_thread; |
| unsigned long cmd_started; /* jiffies */ |
| unsigned int cmd_busy:1; |
| unsigned int link_active_reporting:1; |
| unsigned int notification_enabled:1; |
| unsigned int power_fault_detected; |
| atomic_t pending_events; |
| int request_result; |
| wait_queue_head_t requester; |
| }; |
| |
| /** |
| * 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, |
| * green led is blinking |
| * @BLINKINGOFF_STATE: slot will be powered off after the 5 second delay, |
| * green led 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 0 |
| #define BLINKINGON_STATE 1 |
| #define BLINKINGOFF_STATE 2 |
| #define POWERON_STATE 3 |
| #define POWEROFF_STATE 4 |
| #define ON_STATE 5 |
| |
| /** |
| * 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 (1 << 16) |
| #define RERUN_ISR (1 << 17) |
| |
| #define ATTN_BUTTN(ctrl) ((ctrl)->slot_cap & PCI_EXP_SLTCAP_ABP) |
| #define POWER_CTRL(ctrl) ((ctrl)->slot_cap & PCI_EXP_SLTCAP_PCP) |
| #define MRL_SENS(ctrl) ((ctrl)->slot_cap & PCI_EXP_SLTCAP_MRLSP) |
| #define ATTN_LED(ctrl) ((ctrl)->slot_cap & PCI_EXP_SLTCAP_AIP) |
| #define PWR_LED(ctrl) ((ctrl)->slot_cap & PCI_EXP_SLTCAP_PIP) |
| #define HP_SUPR_RM(ctrl) ((ctrl)->slot_cap & PCI_EXP_SLTCAP_HPS) |
| #define EMI(ctrl) ((ctrl)->slot_cap & PCI_EXP_SLTCAP_EIP) |
| #define NO_CMD_CMPL(ctrl) ((ctrl)->slot_cap & PCI_EXP_SLTCAP_NCCS) |
| #define PSN(ctrl) (((ctrl)->slot_cap & PCI_EXP_SLTCAP_PSN) >> 19) |
| |
| int pciehp_sysfs_enable_slot(struct slot *slot); |
| int pciehp_sysfs_disable_slot(struct slot *slot); |
| void pciehp_request(struct controller *ctrl, int action); |
| void pciehp_handle_button_press(struct slot *slot); |
| void pciehp_handle_disable_request(struct slot *slot); |
| void pciehp_handle_presence_or_link_change(struct slot *slot, u32 events); |
| int pciehp_configure_device(struct slot *p_slot); |
| void pciehp_unconfigure_device(struct slot *p_slot); |
| 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); |
| int pciehp_power_on_slot(struct slot *slot); |
| void pciehp_power_off_slot(struct slot *slot); |
| void pciehp_get_power_status(struct slot *slot, u8 *status); |
| void pciehp_get_attention_status(struct slot *slot, u8 *status); |
| |
| void pciehp_set_attention_status(struct slot *slot, u8 status); |
| void pciehp_get_latch_status(struct slot *slot, u8 *status); |
| void pciehp_get_adapter_status(struct slot *slot, u8 *status); |
| int pciehp_query_power_fault(struct slot *slot); |
| void pciehp_green_led_on(struct slot *slot); |
| void pciehp_green_led_off(struct slot *slot); |
| void pciehp_green_led_blink(struct slot *slot); |
| int pciehp_check_link_status(struct controller *ctrl); |
| bool pciehp_check_link_active(struct controller *ctrl); |
| void pciehp_release_ctrl(struct controller *ctrl); |
| int pciehp_reset_slot(struct slot *slot, int probe); |
| |
| 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); |
| |
| static inline const char *slot_name(struct slot *slot) |
| { |
| return hotplug_slot_name(slot->hotplug_slot); |
| } |
| |
| #endif /* _PCIEHP_H */ |
