diff options
Diffstat (limited to 'drivers/misc/mic/host/mic_boot.c')
| -rw-r--r-- | drivers/misc/mic/host/mic_boot.c | 184 |
1 files changed, 184 insertions, 0 deletions
diff --git a/drivers/misc/mic/host/mic_boot.c b/drivers/misc/mic/host/mic_boot.c new file mode 100644 index 000000000000..936fc58084f3 --- /dev/null +++ b/drivers/misc/mic/host/mic_boot.c @@ -0,0 +1,184 @@ +/* + * Intel MIC Platform Software Stack (MPSS) + * + * Copyright(c) 2013 Intel Corporation. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License, version 2, as + * published by the Free Software Foundation. + * + * 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. See the GNU + * General Public License for more details. + * + * The full GNU General Public License is included in this distribution in + * the file called "COPYING". + * + * Intel MIC Host driver. + * + */ +#include <linux/delay.h> +#include <linux/firmware.h> +#include <linux/interrupt.h> + +#include <linux/mic_common.h> +#include "../common/mic_device.h" +#include "mic_device.h" +#include "mic_smpt.h" + +/** + * mic_reset - Reset the MIC device. + * @mdev: pointer to mic_device instance + */ +static void mic_reset(struct mic_device *mdev) +{ + int i; + +#define MIC_RESET_TO (45) + + mdev->ops->reset_fw_ready(mdev); + mdev->ops->reset(mdev); + + for (i = 0; i < MIC_RESET_TO; i++) { + if (mdev->ops->is_fw_ready(mdev)) + return; + /* + * Resets typically take 10s of seconds to complete. + * Since an MMIO read is required to check if the + * firmware is ready or not, a 1 second delay works nicely. + */ + msleep(1000); + } + mic_set_state(mdev, MIC_RESET_FAILED); +} + +/* Initialize the MIC bootparams */ +void mic_bootparam_init(struct mic_device *mdev) +{ + struct mic_bootparam *bootparam = mdev->dp; + + bootparam->magic = MIC_MAGIC; + bootparam->c2h_shutdown_db = mdev->shutdown_db; + bootparam->h2c_shutdown_db = -1; + bootparam->h2c_config_db = -1; + bootparam->shutdown_status = 0; + bootparam->shutdown_card = 0; +} + +/** + * mic_start - Start the MIC. + * @mdev: pointer to mic_device instance + * @buf: buffer containing boot string including firmware/ramdisk path. + * + * This function prepares an MIC for boot and initiates boot. + * RETURNS: An appropriate -ERRNO error value on error, or zero for success. + */ +int mic_start(struct mic_device *mdev, const char *buf) +{ + int rc; + mutex_lock(&mdev->mic_mutex); +retry: + if (MIC_OFFLINE != mdev->state) { + rc = -EINVAL; + goto unlock_ret; + } + if (!mdev->ops->is_fw_ready(mdev)) { + mic_reset(mdev); + /* + * The state will either be MIC_OFFLINE if the reset succeeded + * or MIC_RESET_FAILED if the firmware reset failed. + */ + goto retry; + } + rc = mdev->ops->load_mic_fw(mdev, buf); + if (rc) + goto unlock_ret; + mic_smpt_restore(mdev); + mic_intr_restore(mdev); + mdev->intr_ops->enable_interrupts(mdev); + mdev->ops->write_spad(mdev, MIC_DPLO_SPAD, mdev->dp_dma_addr); + mdev->ops->write_spad(mdev, MIC_DPHI_SPAD, mdev->dp_dma_addr >> 32); + mdev->ops->send_firmware_intr(mdev); + mic_set_state(mdev, MIC_ONLINE); +unlock_ret: + mutex_unlock(&mdev->mic_mutex); + return rc; +} + +/** + * mic_stop - Prepare the MIC for reset and trigger reset. + * @mdev: pointer to mic_device instance + * @force: force a MIC to reset even if it is already offline. + * + * RETURNS: None. + */ +void mic_stop(struct mic_device *mdev, bool force) +{ + mutex_lock(&mdev->mic_mutex); + if (MIC_OFFLINE != mdev->state || force) { + mic_bootparam_init(mdev); + mic_reset(mdev); + if (MIC_RESET_FAILED == mdev->state) + goto unlock; + mic_set_shutdown_status(mdev, MIC_NOP); + mic_set_state(mdev, MIC_OFFLINE); + } +unlock: + mutex_unlock(&mdev->mic_mutex); +} + +/** + * mic_shutdown - Initiate MIC shutdown. + * @mdev: pointer to mic_device instance + * + * RETURNS: None. + */ +void mic_shutdown(struct mic_device *mdev) +{ + struct mic_bootparam *bootparam = mdev->dp; + s8 db = bootparam->h2c_shutdown_db; + + mutex_lock(&mdev->mic_mutex); + if (MIC_ONLINE == mdev->state && db != -1) { + bootparam->shutdown_card = 1; + mdev->ops->send_intr(mdev, db); + mic_set_state(mdev, MIC_SHUTTING_DOWN); + } + mutex_unlock(&mdev->mic_mutex); +} + +/** + * mic_shutdown_work - Handle shutdown interrupt from MIC. + * @work: The work structure. + * + * This work is scheduled whenever the host has received a shutdown + * interrupt from the MIC. + */ +void mic_shutdown_work(struct work_struct *work) +{ + struct mic_device *mdev = container_of(work, struct mic_device, + shutdown_work); + struct mic_bootparam *bootparam = mdev->dp; + + mutex_lock(&mdev->mic_mutex); + mic_set_shutdown_status(mdev, bootparam->shutdown_status); + bootparam->shutdown_status = 0; + if (MIC_SHUTTING_DOWN != mdev->state) + mic_set_state(mdev, MIC_SHUTTING_DOWN); + mutex_unlock(&mdev->mic_mutex); +} + +/** + * mic_reset_trigger_work - Trigger MIC reset. + * @work: The work structure. + * + * This work is scheduled whenever the host wants to reset the MIC. + */ +void mic_reset_trigger_work(struct work_struct *work) +{ + struct mic_device *mdev = container_of(work, struct mic_device, + reset_trigger_work); + + mic_stop(mdev, false); +} |