mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-28 11:18:45 +07:00
173c072787
Endianness issues are now consistent as per the documentation in host/mic_virtio.h. Sparse warnings related to endianness are also fixed. Note that the MIC driver implementation assumes that the host can be both BE or LE whereas the card is always LE. Reported-by: Fengguang Wu <fengguang.wu@intel.com> Reviewed-by: Sudeep Dutt <sudeep.dutt@intel.com> Reviewed-by: Nikhil Rao <nikhil.rao@intel.com> Signed-off-by: Ashutosh Dixit <ashutosh.dixit@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
301 lines
7.6 KiB
C
301 lines
7.6 KiB
C
/*
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* Intel MIC Platform Software Stack (MPSS)
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*
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* Copyright(c) 2013 Intel Corporation.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License, version 2, as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* The full GNU General Public License is included in this distribution in
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* the file called "COPYING".
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*
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* Intel MIC Host driver.
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*
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*/
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#include <linux/delay.h>
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#include <linux/firmware.h>
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#include <linux/pci.h>
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#include <linux/mic_common.h>
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#include "../common/mic_dev.h"
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#include "mic_device.h"
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#include "mic_smpt.h"
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#include "mic_virtio.h"
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/**
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* mic_reset - Reset the MIC device.
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* @mdev: pointer to mic_device instance
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*/
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static void mic_reset(struct mic_device *mdev)
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{
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int i;
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#define MIC_RESET_TO (45)
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reinit_completion(&mdev->reset_wait);
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mdev->ops->reset_fw_ready(mdev);
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mdev->ops->reset(mdev);
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for (i = 0; i < MIC_RESET_TO; i++) {
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if (mdev->ops->is_fw_ready(mdev))
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goto done;
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/*
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* Resets typically take 10s of seconds to complete.
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* Since an MMIO read is required to check if the
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* firmware is ready or not, a 1 second delay works nicely.
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*/
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msleep(1000);
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}
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mic_set_state(mdev, MIC_RESET_FAILED);
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done:
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complete_all(&mdev->reset_wait);
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}
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/* Initialize the MIC bootparams */
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void mic_bootparam_init(struct mic_device *mdev)
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{
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struct mic_bootparam *bootparam = mdev->dp;
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bootparam->magic = cpu_to_le32(MIC_MAGIC);
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bootparam->c2h_shutdown_db = mdev->shutdown_db;
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bootparam->h2c_shutdown_db = -1;
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bootparam->h2c_config_db = -1;
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bootparam->shutdown_status = 0;
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bootparam->shutdown_card = 0;
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}
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/**
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* mic_start - Start the MIC.
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* @mdev: pointer to mic_device instance
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* @buf: buffer containing boot string including firmware/ramdisk path.
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*
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* This function prepares an MIC for boot and initiates boot.
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* RETURNS: An appropriate -ERRNO error value on error, or zero for success.
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*/
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int mic_start(struct mic_device *mdev, const char *buf)
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{
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int rc;
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mutex_lock(&mdev->mic_mutex);
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retry:
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if (MIC_OFFLINE != mdev->state) {
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rc = -EINVAL;
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goto unlock_ret;
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}
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if (!mdev->ops->is_fw_ready(mdev)) {
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mic_reset(mdev);
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/*
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* The state will either be MIC_OFFLINE if the reset succeeded
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* or MIC_RESET_FAILED if the firmware reset failed.
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*/
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goto retry;
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}
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rc = mdev->ops->load_mic_fw(mdev, buf);
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if (rc)
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goto unlock_ret;
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mic_smpt_restore(mdev);
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mic_intr_restore(mdev);
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mdev->intr_ops->enable_interrupts(mdev);
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mdev->ops->write_spad(mdev, MIC_DPLO_SPAD, mdev->dp_dma_addr);
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mdev->ops->write_spad(mdev, MIC_DPHI_SPAD, mdev->dp_dma_addr >> 32);
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mdev->ops->send_firmware_intr(mdev);
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mic_set_state(mdev, MIC_ONLINE);
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unlock_ret:
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mutex_unlock(&mdev->mic_mutex);
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return rc;
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}
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/**
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* mic_stop - Prepare the MIC for reset and trigger reset.
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* @mdev: pointer to mic_device instance
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* @force: force a MIC to reset even if it is already offline.
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*
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* RETURNS: None.
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*/
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void mic_stop(struct mic_device *mdev, bool force)
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{
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mutex_lock(&mdev->mic_mutex);
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if (MIC_OFFLINE != mdev->state || force) {
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mic_virtio_reset_devices(mdev);
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mic_bootparam_init(mdev);
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mic_reset(mdev);
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if (MIC_RESET_FAILED == mdev->state)
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goto unlock;
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mic_set_shutdown_status(mdev, MIC_NOP);
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if (MIC_SUSPENDED != mdev->state)
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mic_set_state(mdev, MIC_OFFLINE);
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}
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unlock:
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mutex_unlock(&mdev->mic_mutex);
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}
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/**
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* mic_shutdown - Initiate MIC shutdown.
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* @mdev: pointer to mic_device instance
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*
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* RETURNS: None.
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*/
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void mic_shutdown(struct mic_device *mdev)
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{
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struct mic_bootparam *bootparam = mdev->dp;
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s8 db = bootparam->h2c_shutdown_db;
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mutex_lock(&mdev->mic_mutex);
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if (MIC_ONLINE == mdev->state && db != -1) {
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bootparam->shutdown_card = 1;
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mdev->ops->send_intr(mdev, db);
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mic_set_state(mdev, MIC_SHUTTING_DOWN);
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}
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mutex_unlock(&mdev->mic_mutex);
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}
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/**
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* mic_shutdown_work - Handle shutdown interrupt from MIC.
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* @work: The work structure.
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*
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* This work is scheduled whenever the host has received a shutdown
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* interrupt from the MIC.
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*/
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void mic_shutdown_work(struct work_struct *work)
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{
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struct mic_device *mdev = container_of(work, struct mic_device,
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shutdown_work);
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struct mic_bootparam *bootparam = mdev->dp;
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mutex_lock(&mdev->mic_mutex);
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mic_set_shutdown_status(mdev, bootparam->shutdown_status);
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bootparam->shutdown_status = 0;
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/*
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* if state is MIC_SUSPENDED, OSPM suspend is in progress. We do not
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* change the state here so as to prevent users from booting the card
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* during and after the suspend operation.
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*/
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if (MIC_SHUTTING_DOWN != mdev->state &&
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MIC_SUSPENDED != mdev->state)
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mic_set_state(mdev, MIC_SHUTTING_DOWN);
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mutex_unlock(&mdev->mic_mutex);
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}
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/**
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* mic_reset_trigger_work - Trigger MIC reset.
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* @work: The work structure.
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*
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* This work is scheduled whenever the host wants to reset the MIC.
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*/
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void mic_reset_trigger_work(struct work_struct *work)
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{
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struct mic_device *mdev = container_of(work, struct mic_device,
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reset_trigger_work);
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mic_stop(mdev, false);
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}
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/**
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* mic_complete_resume - Complete MIC Resume after an OSPM suspend/hibernate
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* event.
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* @mdev: pointer to mic_device instance
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*
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* RETURNS: None.
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*/
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void mic_complete_resume(struct mic_device *mdev)
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{
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if (mdev->state != MIC_SUSPENDED) {
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dev_warn(mdev->sdev->parent, "state %d should be %d\n",
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mdev->state, MIC_SUSPENDED);
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return;
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}
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/* Make sure firmware is ready */
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if (!mdev->ops->is_fw_ready(mdev))
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mic_stop(mdev, true);
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mutex_lock(&mdev->mic_mutex);
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mic_set_state(mdev, MIC_OFFLINE);
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mutex_unlock(&mdev->mic_mutex);
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}
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/**
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* mic_prepare_suspend - Handle suspend notification for the MIC device.
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* @mdev: pointer to mic_device instance
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*
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* RETURNS: None.
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*/
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void mic_prepare_suspend(struct mic_device *mdev)
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{
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int rc;
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#define MIC_SUSPEND_TIMEOUT (60 * HZ)
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mutex_lock(&mdev->mic_mutex);
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switch (mdev->state) {
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case MIC_OFFLINE:
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/*
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* Card is already offline. Set state to MIC_SUSPENDED
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* to prevent users from booting the card.
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*/
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mic_set_state(mdev, MIC_SUSPENDED);
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mutex_unlock(&mdev->mic_mutex);
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break;
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case MIC_ONLINE:
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/*
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* Card is online. Set state to MIC_SUSPENDING and notify
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* MIC user space daemon which will issue card
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* shutdown and reset.
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*/
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mic_set_state(mdev, MIC_SUSPENDING);
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mutex_unlock(&mdev->mic_mutex);
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rc = wait_for_completion_timeout(&mdev->reset_wait,
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MIC_SUSPEND_TIMEOUT);
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/* Force reset the card if the shutdown completion timed out */
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if (!rc) {
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mutex_lock(&mdev->mic_mutex);
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mic_set_state(mdev, MIC_SUSPENDED);
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mutex_unlock(&mdev->mic_mutex);
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mic_stop(mdev, true);
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}
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break;
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case MIC_SHUTTING_DOWN:
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/*
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* Card is shutting down. Set state to MIC_SUSPENDED
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* to prevent further boot of the card.
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*/
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mic_set_state(mdev, MIC_SUSPENDED);
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mutex_unlock(&mdev->mic_mutex);
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rc = wait_for_completion_timeout(&mdev->reset_wait,
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MIC_SUSPEND_TIMEOUT);
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/* Force reset the card if the shutdown completion timed out */
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if (!rc)
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mic_stop(mdev, true);
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break;
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default:
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mutex_unlock(&mdev->mic_mutex);
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break;
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}
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}
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/**
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* mic_suspend - Initiate MIC suspend. Suspend merely issues card shutdown.
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* @mdev: pointer to mic_device instance
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*
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* RETURNS: None.
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*/
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void mic_suspend(struct mic_device *mdev)
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{
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struct mic_bootparam *bootparam = mdev->dp;
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s8 db = bootparam->h2c_shutdown_db;
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mutex_lock(&mdev->mic_mutex);
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if (MIC_SUSPENDING == mdev->state && db != -1) {
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bootparam->shutdown_card = 1;
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mdev->ops->send_intr(mdev, db);
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mic_set_state(mdev, MIC_SUSPENDED);
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}
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mutex_unlock(&mdev->mic_mutex);
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}
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