| /* |
| * 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. |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or (at |
| * your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, but |
| * WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or |
| * NON INFRINGEMENT. See the GNU General Public License for more |
| * details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| * |
| * Send feedback to <greg@kroah.com>, <kristen.c.accardi@intel.com> |
| * |
| */ |
| |
| #include <linux/module.h> |
| #include <linux/kernel.h> |
| #include <linux/types.h> |
| #include <linux/slab.h> |
| #include <linux/pci.h> |
| #include "../pci.h" |
| #include "pciehp.h" |
| |
| static void interrupt_event_handler(struct work_struct *work); |
| |
| static int queue_interrupt_event(struct slot *p_slot, u32 event_type) |
| { |
| struct event_info *info; |
| |
| info = kmalloc(sizeof(*info), GFP_ATOMIC); |
| if (!info) |
| return -ENOMEM; |
| |
| info->event_type = event_type; |
| info->p_slot = p_slot; |
| INIT_WORK(&info->work, interrupt_event_handler); |
| |
| queue_work(p_slot->wq, &info->work); |
| |
| return 0; |
| } |
| |
| u8 pciehp_handle_attention_button(struct slot *p_slot) |
| { |
| u32 event_type; |
| struct controller *ctrl = p_slot->ctrl; |
| |
| /* Attention Button Change */ |
| ctrl_dbg(ctrl, "Attention button interrupt received\n"); |
| |
| /* |
| * Button pressed - See if need to TAKE ACTION!!! |
| */ |
| ctrl_info(ctrl, "Button pressed on Slot(%s)\n", slot_name(p_slot)); |
| event_type = INT_BUTTON_PRESS; |
| |
| queue_interrupt_event(p_slot, event_type); |
| |
| return 0; |
| } |
| |
| u8 pciehp_handle_switch_change(struct slot *p_slot) |
| { |
| u8 getstatus; |
| u32 event_type; |
| struct controller *ctrl = p_slot->ctrl; |
| |
| /* Switch Change */ |
| ctrl_dbg(ctrl, "Switch interrupt received\n"); |
| |
| pciehp_get_latch_status(p_slot, &getstatus); |
| if (getstatus) { |
| /* |
| * Switch opened |
| */ |
| ctrl_info(ctrl, "Latch open on Slot(%s)\n", slot_name(p_slot)); |
| event_type = INT_SWITCH_OPEN; |
| } else { |
| /* |
| * Switch closed |
| */ |
| ctrl_info(ctrl, "Latch close on Slot(%s)\n", slot_name(p_slot)); |
| event_type = INT_SWITCH_CLOSE; |
| } |
| |
| queue_interrupt_event(p_slot, event_type); |
| |
| return 1; |
| } |
| |
| u8 pciehp_handle_presence_change(struct slot *p_slot) |
| { |
| u32 event_type; |
| u8 presence_save; |
| struct controller *ctrl = p_slot->ctrl; |
| |
| /* Presence Change */ |
| ctrl_dbg(ctrl, "Presence/Notify input change\n"); |
| |
| /* Switch is open, assume a presence change |
| * Save the presence state |
| */ |
| pciehp_get_adapter_status(p_slot, &presence_save); |
| if (presence_save) { |
| /* |
| * Card Present |
| */ |
| ctrl_info(ctrl, "Card present on Slot(%s)\n", slot_name(p_slot)); |
| event_type = INT_PRESENCE_ON; |
| } else { |
| /* |
| * Not Present |
| */ |
| ctrl_info(ctrl, "Card not present on Slot(%s)\n", |
| slot_name(p_slot)); |
| event_type = INT_PRESENCE_OFF; |
| } |
| |
| queue_interrupt_event(p_slot, event_type); |
| |
| return 1; |
| } |
| |
| u8 pciehp_handle_power_fault(struct slot *p_slot) |
| { |
| u32 event_type; |
| struct controller *ctrl = p_slot->ctrl; |
| |
| /* power fault */ |
| ctrl_dbg(ctrl, "Power fault interrupt received\n"); |
| ctrl_err(ctrl, "Power fault on slot %s\n", slot_name(p_slot)); |
| event_type = INT_POWER_FAULT; |
| ctrl_info(ctrl, "Power fault bit %x set\n", 0); |
| queue_interrupt_event(p_slot, event_type); |
| |
| return 1; |
| } |
| |
| void pciehp_handle_linkstate_change(struct slot *p_slot) |
| { |
| u32 event_type; |
| struct controller *ctrl = p_slot->ctrl; |
| |
| /* Link Status Change */ |
| ctrl_dbg(ctrl, "Data Link Layer State change\n"); |
| |
| if (pciehp_check_link_active(ctrl)) { |
| ctrl_info(ctrl, "slot(%s): Link Up event\n", |
| slot_name(p_slot)); |
| event_type = INT_LINK_UP; |
| } else { |
| ctrl_info(ctrl, "slot(%s): Link Down event\n", |
| slot_name(p_slot)); |
| event_type = INT_LINK_DOWN; |
| } |
| |
| queue_interrupt_event(p_slot, event_type); |
| } |
| |
| /* The following routines constitute the bulk of the |
| hotplug controller logic |
| */ |
| |
| static void set_slot_off(struct controller *ctrl, struct slot * pslot) |
| { |
| /* turn off slot, turn on Amber LED, turn off Green LED if supported*/ |
| if (POWER_CTRL(ctrl)) { |
| pciehp_power_off_slot(pslot); |
| |
| /* |
| * After turning power off, we must wait for at least 1 second |
| * before taking any action that relies on power having been |
| * removed from the slot/adapter. |
| */ |
| msleep(1000); |
| } |
| |
| pciehp_green_led_off(pslot); |
| pciehp_set_attention_status(pslot, 1); |
| } |
| |
| /** |
| * board_added - Called after a board has been added to the system. |
| * @p_slot: &slot where board is added |
| * |
| * Turns power on for the board. |
| * Configures board. |
| */ |
| static int board_added(struct slot *p_slot) |
| { |
| int retval = 0; |
| struct controller *ctrl = p_slot->ctrl; |
| struct pci_bus *parent = ctrl->pcie->port->subordinate; |
| |
| if (POWER_CTRL(ctrl)) { |
| /* Power on slot */ |
| retval = pciehp_power_on_slot(p_slot); |
| if (retval) |
| return retval; |
| } |
| |
| pciehp_green_led_blink(p_slot); |
| |
| /* Check link training status */ |
| retval = pciehp_check_link_status(ctrl); |
| if (retval) { |
| ctrl_err(ctrl, "Failed to check link status\n"); |
| goto err_exit; |
| } |
| |
| /* Check for a power fault */ |
| if (ctrl->power_fault_detected || pciehp_query_power_fault(p_slot)) { |
| ctrl_err(ctrl, "Power fault on slot %s\n", slot_name(p_slot)); |
| retval = -EIO; |
| goto err_exit; |
| } |
| |
| retval = pciehp_configure_device(p_slot); |
| if (retval) { |
| ctrl_err(ctrl, "Cannot add device at %04x:%02x:00\n", |
| pci_domain_nr(parent), parent->number); |
| goto err_exit; |
| } |
| |
| pciehp_green_led_on(p_slot); |
| return 0; |
| |
| err_exit: |
| set_slot_off(ctrl, p_slot); |
| return retval; |
| } |
| |
| /** |
| * remove_board - Turns off slot and LEDs |
| * @p_slot: slot where board is being removed |
| */ |
| static int remove_board(struct slot *p_slot) |
| { |
| int retval; |
| struct controller *ctrl = p_slot->ctrl; |
| |
| retval = pciehp_unconfigure_device(p_slot); |
| if (retval) |
| return retval; |
| |
| if (POWER_CTRL(ctrl)) { |
| pciehp_power_off_slot(p_slot); |
| |
| /* |
| * After turning power off, we must wait for at least 1 second |
| * before taking any action that relies on power having been |
| * removed from the slot/adapter. |
| */ |
| msleep(1000); |
| } |
| |
| /* turn off Green LED */ |
| pciehp_green_led_off(p_slot); |
| return 0; |
| } |
| |
| struct power_work_info { |
| struct slot *p_slot; |
| struct work_struct work; |
| }; |
| |
| /** |
| * pciehp_power_thread - handle pushbutton events |
| * @work: &struct work_struct describing work to be done |
| * |
| * Scheduled procedure to handle blocking stuff for the pushbuttons. |
| * Handles all pending events and exits. |
| */ |
| static void pciehp_power_thread(struct work_struct *work) |
| { |
| struct power_work_info *info = |
| container_of(work, struct power_work_info, work); |
| struct slot *p_slot = info->p_slot; |
| |
| mutex_lock(&p_slot->lock); |
| switch (p_slot->state) { |
| case POWEROFF_STATE: |
| mutex_unlock(&p_slot->lock); |
| ctrl_dbg(p_slot->ctrl, |
| "Disabling domain:bus:device=%04x:%02x:00\n", |
| pci_domain_nr(p_slot->ctrl->pcie->port->subordinate), |
| p_slot->ctrl->pcie->port->subordinate->number); |
| pciehp_disable_slot(p_slot); |
| mutex_lock(&p_slot->lock); |
| p_slot->state = STATIC_STATE; |
| break; |
| case POWERON_STATE: |
| mutex_unlock(&p_slot->lock); |
| if (pciehp_enable_slot(p_slot)) |
| pciehp_green_led_off(p_slot); |
| mutex_lock(&p_slot->lock); |
| p_slot->state = STATIC_STATE; |
| break; |
| default: |
| break; |
| } |
| mutex_unlock(&p_slot->lock); |
| |
| kfree(info); |
| } |
| |
| void pciehp_queue_pushbutton_work(struct work_struct *work) |
| { |
| struct slot *p_slot = container_of(work, struct slot, work.work); |
| struct power_work_info *info; |
| |
| info = kmalloc(sizeof(*info), GFP_KERNEL); |
| if (!info) { |
| ctrl_err(p_slot->ctrl, "%s: Cannot allocate memory\n", |
| __func__); |
| return; |
| } |
| info->p_slot = p_slot; |
| INIT_WORK(&info->work, pciehp_power_thread); |
| |
| mutex_lock(&p_slot->lock); |
| switch (p_slot->state) { |
| case BLINKINGOFF_STATE: |
| p_slot->state = POWEROFF_STATE; |
| break; |
| case BLINKINGON_STATE: |
| p_slot->state = POWERON_STATE; |
| break; |
| default: |
| kfree(info); |
| goto out; |
| } |
| queue_work(p_slot->wq, &info->work); |
| out: |
| mutex_unlock(&p_slot->lock); |
| } |
| |
| /* |
| * Note: This function must be called with slot->lock held |
| */ |
| static void handle_button_press_event(struct slot *p_slot) |
| { |
| struct controller *ctrl = p_slot->ctrl; |
| u8 getstatus; |
| |
| switch (p_slot->state) { |
| case STATIC_STATE: |
| pciehp_get_power_status(p_slot, &getstatus); |
| if (getstatus) { |
| p_slot->state = BLINKINGOFF_STATE; |
| ctrl_info(ctrl, |
| "PCI slot #%s - powering off due to button " |
| "press.\n", slot_name(p_slot)); |
| } else { |
| p_slot->state = BLINKINGON_STATE; |
| ctrl_info(ctrl, |
| "PCI slot #%s - powering on due to button " |
| "press.\n", slot_name(p_slot)); |
| } |
| /* blink green LED and turn off amber */ |
| pciehp_green_led_blink(p_slot); |
| pciehp_set_attention_status(p_slot, 0); |
| queue_delayed_work(p_slot->wq, &p_slot->work, 5*HZ); |
| break; |
| case BLINKINGOFF_STATE: |
| case BLINKINGON_STATE: |
| /* |
| * Cancel if we are still blinking; this means that we |
| * press the attention again before the 5 sec. limit |
| * expires to cancel hot-add or hot-remove |
| */ |
| ctrl_info(ctrl, "Button cancel on Slot(%s)\n", slot_name(p_slot)); |
| cancel_delayed_work(&p_slot->work); |
| if (p_slot->state == BLINKINGOFF_STATE) { |
| pciehp_green_led_on(p_slot); |
| } else { |
| pciehp_green_led_off(p_slot); |
| } |
| pciehp_set_attention_status(p_slot, 0); |
| ctrl_info(ctrl, "PCI slot #%s - action canceled " |
| "due to button press\n", slot_name(p_slot)); |
| p_slot->state = STATIC_STATE; |
| break; |
| case POWEROFF_STATE: |
| case POWERON_STATE: |
| /* |
| * Ignore if the slot is on power-on or power-off state; |
| * this means that the previous attention button action |
| * to hot-add or hot-remove is undergoing |
| */ |
| ctrl_info(ctrl, "Button ignore on Slot(%s)\n", slot_name(p_slot)); |
| break; |
| default: |
| ctrl_warn(ctrl, "Not a valid state\n"); |
| break; |
| } |
| } |
| |
| /* |
| * Note: This function must be called with slot->lock held |
| */ |
| static void handle_surprise_event(struct slot *p_slot) |
| { |
| u8 getstatus; |
| struct power_work_info *info; |
| |
| info = kmalloc(sizeof(*info), GFP_KERNEL); |
| if (!info) { |
| ctrl_err(p_slot->ctrl, "%s: Cannot allocate memory\n", |
| __func__); |
| return; |
| } |
| info->p_slot = p_slot; |
| INIT_WORK(&info->work, pciehp_power_thread); |
| |
| pciehp_get_adapter_status(p_slot, &getstatus); |
| if (!getstatus) |
| p_slot->state = POWEROFF_STATE; |
| else |
| p_slot->state = POWERON_STATE; |
| |
| queue_work(p_slot->wq, &info->work); |
| } |
| |
| /* |
| * Note: This function must be called with slot->lock held |
| */ |
| static void handle_link_event(struct slot *p_slot, u32 event) |
| { |
| struct controller *ctrl = p_slot->ctrl; |
| struct power_work_info *info; |
| |
| info = kmalloc(sizeof(*info), GFP_KERNEL); |
| if (!info) { |
| ctrl_err(p_slot->ctrl, "%s: Cannot allocate memory\n", |
| __func__); |
| return; |
| } |
| info->p_slot = p_slot; |
| INIT_WORK(&info->work, pciehp_power_thread); |
| |
| switch (p_slot->state) { |
| case BLINKINGON_STATE: |
| case BLINKINGOFF_STATE: |
| cancel_delayed_work(&p_slot->work); |
| /* Fall through */ |
| case STATIC_STATE: |
| p_slot->state = event == INT_LINK_UP ? |
| POWERON_STATE : POWEROFF_STATE; |
| queue_work(p_slot->wq, &info->work); |
| break; |
| case POWERON_STATE: |
| if (event == INT_LINK_UP) { |
| ctrl_info(ctrl, |
| "Link Up event ignored on slot(%s): already powering on\n", |
| slot_name(p_slot)); |
| kfree(info); |
| } else { |
| ctrl_info(ctrl, |
| "Link Down event queued on slot(%s): currently getting powered on\n", |
| slot_name(p_slot)); |
| p_slot->state = POWEROFF_STATE; |
| queue_work(p_slot->wq, &info->work); |
| } |
| break; |
| case POWEROFF_STATE: |
| if (event == INT_LINK_UP) { |
| ctrl_info(ctrl, |
| "Link Up event queued on slot(%s): currently getting powered off\n", |
| slot_name(p_slot)); |
| p_slot->state = POWERON_STATE; |
| queue_work(p_slot->wq, &info->work); |
| } else { |
| ctrl_info(ctrl, |
| "Link Down event ignored on slot(%s): already powering off\n", |
| slot_name(p_slot)); |
| kfree(info); |
| } |
| break; |
| default: |
| ctrl_err(ctrl, "Not a valid state on slot(%s)\n", |
| slot_name(p_slot)); |
| kfree(info); |
| break; |
| } |
| } |
| |
| static void interrupt_event_handler(struct work_struct *work) |
| { |
| struct event_info *info = container_of(work, struct event_info, work); |
| struct slot *p_slot = info->p_slot; |
| struct controller *ctrl = p_slot->ctrl; |
| |
| mutex_lock(&p_slot->lock); |
| switch (info->event_type) { |
| case INT_BUTTON_PRESS: |
| handle_button_press_event(p_slot); |
| break; |
| case INT_POWER_FAULT: |
| if (!POWER_CTRL(ctrl)) |
| break; |
| pciehp_set_attention_status(p_slot, 1); |
| pciehp_green_led_off(p_slot); |
| break; |
| case INT_PRESENCE_ON: |
| case INT_PRESENCE_OFF: |
| if (!HP_SUPR_RM(ctrl)) |
| break; |
| ctrl_dbg(ctrl, "Surprise Removal\n"); |
| handle_surprise_event(p_slot); |
| break; |
| case INT_LINK_UP: |
| case INT_LINK_DOWN: |
| handle_link_event(p_slot, info->event_type); |
| break; |
| default: |
| break; |
| } |
| mutex_unlock(&p_slot->lock); |
| |
| kfree(info); |
| } |
| |
| int pciehp_enable_slot(struct slot *p_slot) |
| { |
| u8 getstatus = 0; |
| int rc; |
| struct controller *ctrl = p_slot->ctrl; |
| |
| pciehp_get_adapter_status(p_slot, &getstatus); |
| if (!getstatus) { |
| ctrl_info(ctrl, "No adapter on slot(%s)\n", slot_name(p_slot)); |
| return -ENODEV; |
| } |
| if (MRL_SENS(p_slot->ctrl)) { |
| pciehp_get_latch_status(p_slot, &getstatus); |
| if (getstatus) { |
| ctrl_info(ctrl, "Latch open on slot(%s)\n", |
| slot_name(p_slot)); |
| return -ENODEV; |
| } |
| } |
| |
| if (POWER_CTRL(p_slot->ctrl)) { |
| pciehp_get_power_status(p_slot, &getstatus); |
| if (getstatus) { |
| ctrl_info(ctrl, "Already enabled on slot(%s)\n", |
| slot_name(p_slot)); |
| return -EINVAL; |
| } |
| } |
| |
| pciehp_get_latch_status(p_slot, &getstatus); |
| |
| rc = board_added(p_slot); |
| if (rc) { |
| pciehp_get_latch_status(p_slot, &getstatus); |
| } |
| return rc; |
| } |
| |
| |
| int pciehp_disable_slot(struct slot *p_slot) |
| { |
| u8 getstatus = 0; |
| struct controller *ctrl = p_slot->ctrl; |
| |
| if (!p_slot->ctrl) |
| return 1; |
| |
| if (POWER_CTRL(p_slot->ctrl)) { |
| pciehp_get_power_status(p_slot, &getstatus); |
| if (!getstatus) { |
| ctrl_info(ctrl, "Already disabled on slot(%s)\n", |
| slot_name(p_slot)); |
| return -EINVAL; |
| } |
| } |
| |
| return remove_board(p_slot); |
| } |
| |
| int pciehp_sysfs_enable_slot(struct slot *p_slot) |
| { |
| int retval = -ENODEV; |
| struct controller *ctrl = p_slot->ctrl; |
| |
| mutex_lock(&p_slot->lock); |
| switch (p_slot->state) { |
| case BLINKINGON_STATE: |
| cancel_delayed_work(&p_slot->work); |
| case STATIC_STATE: |
| p_slot->state = POWERON_STATE; |
| mutex_unlock(&p_slot->lock); |
| retval = pciehp_enable_slot(p_slot); |
| mutex_lock(&p_slot->lock); |
| p_slot->state = STATIC_STATE; |
| break; |
| case POWERON_STATE: |
| ctrl_info(ctrl, "Slot %s is already in powering on state\n", |
| slot_name(p_slot)); |
| break; |
| case BLINKINGOFF_STATE: |
| case POWEROFF_STATE: |
| ctrl_info(ctrl, "Already enabled on slot %s\n", |
| slot_name(p_slot)); |
| break; |
| default: |
| ctrl_err(ctrl, "Not a valid state on slot %s\n", |
| slot_name(p_slot)); |
| break; |
| } |
| mutex_unlock(&p_slot->lock); |
| |
| return retval; |
| } |
| |
| int pciehp_sysfs_disable_slot(struct slot *p_slot) |
| { |
| int retval = -ENODEV; |
| struct controller *ctrl = p_slot->ctrl; |
| |
| mutex_lock(&p_slot->lock); |
| switch (p_slot->state) { |
| case BLINKINGOFF_STATE: |
| cancel_delayed_work(&p_slot->work); |
| case STATIC_STATE: |
| p_slot->state = POWEROFF_STATE; |
| mutex_unlock(&p_slot->lock); |
| retval = pciehp_disable_slot(p_slot); |
| mutex_lock(&p_slot->lock); |
| p_slot->state = STATIC_STATE; |
| break; |
| case POWEROFF_STATE: |
| ctrl_info(ctrl, "Slot %s is already in powering off state\n", |
| slot_name(p_slot)); |
| break; |
| case BLINKINGON_STATE: |
| case POWERON_STATE: |
| ctrl_info(ctrl, "Already disabled on slot %s\n", |
| slot_name(p_slot)); |
| break; |
| default: |
| ctrl_err(ctrl, "Not a valid state on slot %s\n", |
| slot_name(p_slot)); |
| break; |
| } |
| mutex_unlock(&p_slot->lock); |
| |
| return retval; |
| } |