| /* |
| * 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/smp_lock.h> |
| #include <linux/pci.h> |
| #include <linux/workqueue.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); |
| |
| schedule_work(&info->work); |
| |
| return 0; |
| } |
| |
| u8 pciehp_handle_attention_button(u8 hp_slot, struct controller *ctrl) |
| { |
| struct slot *p_slot; |
| u32 event_type; |
| |
| /* Attention Button Change */ |
| dbg("pciehp: Attention button interrupt received.\n"); |
| |
| p_slot = pciehp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset); |
| |
| /* |
| * Button pressed - See if need to TAKE ACTION!!! |
| */ |
| info("Button pressed on Slot(%s)\n", p_slot->name); |
| event_type = INT_BUTTON_PRESS; |
| |
| queue_interrupt_event(p_slot, event_type); |
| |
| return 0; |
| } |
| |
| u8 pciehp_handle_switch_change(u8 hp_slot, struct controller *ctrl) |
| { |
| struct slot *p_slot; |
| u8 getstatus; |
| u32 event_type; |
| |
| /* Switch Change */ |
| dbg("pciehp: Switch interrupt received.\n"); |
| |
| p_slot = pciehp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset); |
| p_slot->hpc_ops->get_latch_status(p_slot, &getstatus); |
| |
| if (getstatus) { |
| /* |
| * Switch opened |
| */ |
| info("Latch open on Slot(%s)\n", p_slot->name); |
| event_type = INT_SWITCH_OPEN; |
| } else { |
| /* |
| * Switch closed |
| */ |
| info("Latch close on Slot(%s)\n", p_slot->name); |
| event_type = INT_SWITCH_CLOSE; |
| } |
| |
| queue_interrupt_event(p_slot, event_type); |
| |
| return 1; |
| } |
| |
| u8 pciehp_handle_presence_change(u8 hp_slot, struct controller *ctrl) |
| { |
| struct slot *p_slot; |
| u32 event_type; |
| u8 presence_save; |
| |
| /* Presence Change */ |
| dbg("pciehp: Presence/Notify input change.\n"); |
| |
| p_slot = pciehp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset); |
| |
| /* Switch is open, assume a presence change |
| * Save the presence state |
| */ |
| p_slot->hpc_ops->get_adapter_status(p_slot, &presence_save); |
| if (presence_save) { |
| /* |
| * Card Present |
| */ |
| info("Card present on Slot(%s)\n", p_slot->name); |
| event_type = INT_PRESENCE_ON; |
| } else { |
| /* |
| * Not Present |
| */ |
| info("Card not present on Slot(%s)\n", p_slot->name); |
| event_type = INT_PRESENCE_OFF; |
| } |
| |
| queue_interrupt_event(p_slot, event_type); |
| |
| return 1; |
| } |
| |
| u8 pciehp_handle_power_fault(u8 hp_slot, struct controller *ctrl) |
| { |
| struct slot *p_slot; |
| u32 event_type; |
| |
| /* power fault */ |
| dbg("pciehp: Power fault interrupt received.\n"); |
| |
| p_slot = pciehp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset); |
| |
| if ( !(p_slot->hpc_ops->query_power_fault(p_slot))) { |
| /* |
| * power fault Cleared |
| */ |
| info("Power fault cleared on Slot(%s)\n", p_slot->name); |
| event_type = INT_POWER_FAULT_CLEAR; |
| } else { |
| /* |
| * power fault |
| */ |
| info("Power fault on Slot(%s)\n", p_slot->name); |
| event_type = INT_POWER_FAULT; |
| info("power fault bit %x set\n", hp_slot); |
| } |
| |
| queue_interrupt_event(p_slot, event_type); |
| |
| return 1; |
| } |
| |
| /* 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->ctrlcap)) { |
| if (pslot->hpc_ops->power_off_slot(pslot)) { |
| err("%s: Issue of Slot Power Off command failed\n", |
| __FUNCTION__); |
| return; |
| } |
| } |
| |
| if (PWR_LED(ctrl->ctrlcap)) |
| pslot->hpc_ops->green_led_off(pslot); |
| |
| if (ATTN_LED(ctrl->ctrlcap)) { |
| if (pslot->hpc_ops->set_attention_status(pslot, 1)) { |
| err("%s: Issue of Set Attention Led command failed\n", |
| __FUNCTION__); |
| return; |
| } |
| /* |
| * 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); |
| } |
| } |
| |
| /** |
| * 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) |
| { |
| u8 hp_slot; |
| int retval = 0; |
| struct controller *ctrl = p_slot->ctrl; |
| |
| hp_slot = p_slot->device - ctrl->slot_device_offset; |
| |
| dbg("%s: slot device, slot offset, hp slot = %d, %d ,%d\n", |
| __FUNCTION__, p_slot->device, |
| ctrl->slot_device_offset, hp_slot); |
| |
| if (POWER_CTRL(ctrl->ctrlcap)) { |
| /* Power on slot */ |
| retval = p_slot->hpc_ops->power_on_slot(p_slot); |
| if (retval) |
| return retval; |
| } |
| |
| if (PWR_LED(ctrl->ctrlcap)) |
| p_slot->hpc_ops->green_led_blink(p_slot); |
| |
| /* Wait for ~1 second */ |
| msleep(1000); |
| |
| /* Check link training status */ |
| retval = p_slot->hpc_ops->check_lnk_status(ctrl); |
| if (retval) { |
| err("%s: Failed to check link status\n", __FUNCTION__); |
| set_slot_off(ctrl, p_slot); |
| return retval; |
| } |
| |
| /* Check for a power fault */ |
| if (p_slot->hpc_ops->query_power_fault(p_slot)) { |
| dbg("%s: power fault detected\n", __FUNCTION__); |
| retval = POWER_FAILURE; |
| goto err_exit; |
| } |
| |
| retval = pciehp_configure_device(p_slot); |
| if (retval) { |
| err("Cannot add device 0x%x:%x\n", p_slot->bus, |
| p_slot->device); |
| goto err_exit; |
| } |
| |
| /* |
| * Some PCI Express root ports require fixup after hot-plug operation. |
| */ |
| if (pcie_mch_quirk) |
| pci_fixup_device(pci_fixup_final, ctrl->pci_dev); |
| if (PWR_LED(ctrl->ctrlcap)) |
| p_slot->hpc_ops->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) |
| { |
| u8 device; |
| u8 hp_slot; |
| int retval = 0; |
| struct controller *ctrl = p_slot->ctrl; |
| |
| retval = pciehp_unconfigure_device(p_slot); |
| if (retval) |
| return retval; |
| |
| device = p_slot->device; |
| hp_slot = p_slot->device - ctrl->slot_device_offset; |
| p_slot = pciehp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset); |
| |
| dbg("In %s, hp_slot = %d\n", __FUNCTION__, hp_slot); |
| |
| if (POWER_CTRL(ctrl->ctrlcap)) { |
| /* power off slot */ |
| retval = p_slot->hpc_ops->power_off_slot(p_slot); |
| if (retval) { |
| err("%s: Issue of Slot Disable command failed\n", |
| __FUNCTION__); |
| return retval; |
| } |
| } |
| |
| if (PWR_LED(ctrl->ctrlcap)) |
| /* turn off Green LED */ |
| p_slot->hpc_ops->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); |
| dbg("%s: disabling bus:device(%x:%x)\n", |
| __FUNCTION__, p_slot->bus, p_slot->device); |
| 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) && |
| PWR_LED(p_slot->ctrl->ctrlcap)) |
| p_slot->hpc_ops->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) { |
| err("%s: Cannot allocate memory\n", __FUNCTION__); |
| 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: |
| goto out; |
| } |
| queue_work(pciehp_wq, &info->work); |
| out: |
| mutex_unlock(&p_slot->lock); |
| } |
| |
| static int update_slot_info(struct slot *slot) |
| { |
| struct hotplug_slot_info *info; |
| int result; |
| |
| info = kmalloc(sizeof(*info), GFP_KERNEL); |
| if (!info) |
| return -ENOMEM; |
| |
| slot->hpc_ops->get_power_status(slot, &(info->power_status)); |
| slot->hpc_ops->get_attention_status(slot, &(info->attention_status)); |
| slot->hpc_ops->get_latch_status(slot, &(info->latch_status)); |
| slot->hpc_ops->get_adapter_status(slot, &(info->adapter_status)); |
| |
| result = pci_hp_change_slot_info(slot->hotplug_slot, info); |
| kfree (info); |
| return result; |
| } |
| |
| /* |
| * 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: |
| p_slot->hpc_ops->get_power_status(p_slot, &getstatus); |
| if (getstatus) { |
| p_slot->state = BLINKINGOFF_STATE; |
| info("PCI slot #%s - powering off due to button " |
| "press.\n", p_slot->name); |
| } else { |
| p_slot->state = BLINKINGON_STATE; |
| info("PCI slot #%s - powering on due to button " |
| "press.\n", p_slot->name); |
| } |
| /* blink green LED and turn off amber */ |
| if (PWR_LED(ctrl->ctrlcap)) |
| p_slot->hpc_ops->green_led_blink(p_slot); |
| if (ATTN_LED(ctrl->ctrlcap)) |
| p_slot->hpc_ops->set_attention_status(p_slot, 0); |
| |
| schedule_delayed_work(&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 |
| */ |
| info("Button cancel on Slot(%s)\n", p_slot->name); |
| dbg("%s: button cancel\n", __FUNCTION__); |
| cancel_delayed_work(&p_slot->work); |
| if (p_slot->state == BLINKINGOFF_STATE) { |
| if (PWR_LED(ctrl->ctrlcap)) |
| p_slot->hpc_ops->green_led_on(p_slot); |
| } else { |
| if (PWR_LED(ctrl->ctrlcap)) |
| p_slot->hpc_ops->green_led_off(p_slot); |
| } |
| if (ATTN_LED(ctrl->ctrlcap)) |
| p_slot->hpc_ops->set_attention_status(p_slot, 0); |
| info("PCI slot #%s - action canceled due to button press\n", |
| p_slot->name); |
| 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 |
| */ |
| info("Button ignore on Slot(%s)\n", p_slot->name); |
| update_slot_info(p_slot); |
| break; |
| default: |
| warn("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) { |
| err("%s: Cannot allocate memory\n", __FUNCTION__); |
| return; |
| } |
| info->p_slot = p_slot; |
| INIT_WORK(&info->work, pciehp_power_thread); |
| |
| p_slot->hpc_ops->get_adapter_status(p_slot, &getstatus); |
| if (!getstatus) |
| p_slot->state = POWEROFF_STATE; |
| else |
| p_slot->state = POWERON_STATE; |
| |
| queue_work(pciehp_wq, &info->work); |
| } |
| |
| 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->ctrlcap)) |
| break; |
| if (ATTN_LED(ctrl->ctrlcap)) |
| p_slot->hpc_ops->set_attention_status(p_slot, 1); |
| if (PWR_LED(ctrl->ctrlcap)) |
| p_slot->hpc_ops->green_led_off(p_slot); |
| break; |
| case INT_PRESENCE_ON: |
| case INT_PRESENCE_OFF: |
| if (!HP_SUPR_RM(ctrl->ctrlcap)) |
| break; |
| dbg("Surprise Removal\n"); |
| update_slot_info(p_slot); |
| handle_surprise_event(p_slot); |
| break; |
| default: |
| update_slot_info(p_slot); |
| break; |
| } |
| mutex_unlock(&p_slot->lock); |
| |
| kfree(info); |
| } |
| |
| int pciehp_enable_slot(struct slot *p_slot) |
| { |
| u8 getstatus = 0; |
| int rc; |
| |
| /* Check to see if (latch closed, card present, power off) */ |
| mutex_lock(&p_slot->ctrl->crit_sect); |
| |
| rc = p_slot->hpc_ops->get_adapter_status(p_slot, &getstatus); |
| if (rc || !getstatus) { |
| info("%s: no adapter on slot(%s)\n", __FUNCTION__, |
| p_slot->name); |
| mutex_unlock(&p_slot->ctrl->crit_sect); |
| return -ENODEV; |
| } |
| if (MRL_SENS(p_slot->ctrl->ctrlcap)) { |
| rc = p_slot->hpc_ops->get_latch_status(p_slot, &getstatus); |
| if (rc || getstatus) { |
| info("%s: latch open on slot(%s)\n", __FUNCTION__, |
| p_slot->name); |
| mutex_unlock(&p_slot->ctrl->crit_sect); |
| return -ENODEV; |
| } |
| } |
| |
| if (POWER_CTRL(p_slot->ctrl->ctrlcap)) { |
| rc = p_slot->hpc_ops->get_power_status(p_slot, &getstatus); |
| if (rc || getstatus) { |
| info("%s: already enabled on slot(%s)\n", __FUNCTION__, |
| p_slot->name); |
| mutex_unlock(&p_slot->ctrl->crit_sect); |
| return -EINVAL; |
| } |
| } |
| |
| p_slot->hpc_ops->get_latch_status(p_slot, &getstatus); |
| |
| rc = board_added(p_slot); |
| if (rc) { |
| p_slot->hpc_ops->get_latch_status(p_slot, &getstatus); |
| } |
| |
| update_slot_info(p_slot); |
| |
| mutex_unlock(&p_slot->ctrl->crit_sect); |
| return rc; |
| } |
| |
| |
| int pciehp_disable_slot(struct slot *p_slot) |
| { |
| u8 getstatus = 0; |
| int ret = 0; |
| |
| if (!p_slot->ctrl) |
| return 1; |
| |
| /* Check to see if (latch closed, card present, power on) */ |
| mutex_lock(&p_slot->ctrl->crit_sect); |
| |
| if (!HP_SUPR_RM(p_slot->ctrl->ctrlcap)) { |
| ret = p_slot->hpc_ops->get_adapter_status(p_slot, &getstatus); |
| if (ret || !getstatus) { |
| info("%s: no adapter on slot(%s)\n", __FUNCTION__, |
| p_slot->name); |
| mutex_unlock(&p_slot->ctrl->crit_sect); |
| return -ENODEV; |
| } |
| } |
| |
| if (MRL_SENS(p_slot->ctrl->ctrlcap)) { |
| ret = p_slot->hpc_ops->get_latch_status(p_slot, &getstatus); |
| if (ret || getstatus) { |
| info("%s: latch open on slot(%s)\n", __FUNCTION__, |
| p_slot->name); |
| mutex_unlock(&p_slot->ctrl->crit_sect); |
| return -ENODEV; |
| } |
| } |
| |
| if (POWER_CTRL(p_slot->ctrl->ctrlcap)) { |
| ret = p_slot->hpc_ops->get_power_status(p_slot, &getstatus); |
| if (ret || !getstatus) { |
| info("%s: already disabled slot(%s)\n", __FUNCTION__, |
| p_slot->name); |
| mutex_unlock(&p_slot->ctrl->crit_sect); |
| return -EINVAL; |
| } |
| /* |
| * 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); |
| } |
| |
| ret = remove_board(p_slot); |
| update_slot_info(p_slot); |
| |
| mutex_unlock(&p_slot->ctrl->crit_sect); |
| return ret; |
| } |
| |
| int pciehp_sysfs_enable_slot(struct slot *p_slot) |
| { |
| int retval = -ENODEV; |
| |
| 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: |
| info("Slot %s is already in powering on state\n", |
| p_slot->name); |
| break; |
| case BLINKINGOFF_STATE: |
| case POWEROFF_STATE: |
| info("Already enabled on slot %s\n", p_slot->name); |
| break; |
| default: |
| err("Not a valid state on slot %s\n", p_slot->name); |
| break; |
| } |
| mutex_unlock(&p_slot->lock); |
| |
| return retval; |
| } |
| |
| int pciehp_sysfs_disable_slot(struct slot *p_slot) |
| { |
| int retval = -ENODEV; |
| |
| 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: |
| info("Slot %s is already in powering off state\n", |
| p_slot->name); |
| break; |
| case BLINKINGON_STATE: |
| case POWERON_STATE: |
| info("Already disabled on slot %s\n", p_slot->name); |
| break; |
| default: |
| err("Not a valid state on slot %s\n", p_slot->name); |
| break; |
| } |
| mutex_unlock(&p_slot->lock); |
| |
| return retval; |
| } |