diff options
author | Linus Torvalds <torvalds@linux-foundation.org> | 2013-11-07 09:41:06 +0900 |
---|---|---|
committer | Linus Torvalds <torvalds@linux-foundation.org> | 2013-11-07 09:41:06 +0900 |
commit | 1071ec7bc2dabd0a9d12a1ae5570f4fd3ba944ca (patch) | |
tree | 3f889877ae180066a8e682d915680f240fbfd6ec /drivers/misc/mic/host/mic_boot.c | |
parent | c287322c3aadf45ee15339bffdbc2e9117b9cc7a (diff) | |
parent | 425792266a40189e0b3fec02cb59a69935d8c58c (diff) |
Merge tag 'char-misc-3.13-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc
Pull char/misc patches from Greg KH:
"Here's the big char/misc driver patchset for 3.13-rc1.
Lots of stuff in here, including some new drivers for Intel's "MIC"
co-processor devices, and a new eeprom driver. Other things include
the driver attribute cleanups, extcon driver updates, hyperv updates,
and a raft of other miscellaneous driver fixes.
All of these have been in linux-next for a while"
* tag 'char-misc-3.13-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc: (121 commits)
misc: mic: Fixes for randconfig build errors and warnings.
tifm: fix error return code in tifm_7xx1_probe()
w1-gpio: Use devm_* functions
w1-gpio: Detect of_gpio_error for first gpio
uio: Pass pointers to virt_to_page(), not integers
uio: fix memory leak
misc/at24: avoid infinite loop on write()
misc/93xx46: avoid infinite loop on write()
misc: atmel_pwm: add deferred-probing support
mei: wd: host_init propagate error codes from called functions
mei: replace stray pr_debug with dev_dbg
mei: bus: propagate error code returned by mei_me_cl_by_id
mei: mei_cl_link remove duplicated check for open_handle_count
mei: print correct device state during unexpected reset
mei: nfc: fix memory leak in error path
lkdtm: add tests for additional page permissions
lkdtm: adjust recursion size to avoid warnings
lkdtm: isolate stack corruption test
mei: move host_clients_map cleanup to device init
mei: me: downgrade two errors to debug level
...
Diffstat (limited to 'drivers/misc/mic/host/mic_boot.c')
-rw-r--r-- | drivers/misc/mic/host/mic_boot.c | 300 |
1 files changed, 300 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..b079c65eed6d --- /dev/null +++ b/drivers/misc/mic/host/mic_boot.c @@ -0,0 +1,300 @@ +/* + * 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/pci.h> + +#include <linux/mic_common.h> +#include "../common/mic_dev.h" +#include "mic_device.h" +#include "mic_smpt.h" +#include "mic_virtio.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) + + INIT_COMPLETION(mdev->reset_wait); + 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)) + goto done; + /* + * 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); +done: + complete_all(&mdev->reset_wait); +} + +/* 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_virtio_reset_devices(mdev); + mic_bootparam_init(mdev); + mic_reset(mdev); + if (MIC_RESET_FAILED == mdev->state) + goto unlock; + mic_set_shutdown_status(mdev, MIC_NOP); + if (MIC_SUSPENDED != mdev->state) + 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 state is MIC_SUSPENDED, OSPM suspend is in progress. We do not + * change the state here so as to prevent users from booting the card + * during and after the suspend operation. + */ + if (MIC_SHUTTING_DOWN != mdev->state && + MIC_SUSPENDED != 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); +} + +/** + * mic_complete_resume - Complete MIC Resume after an OSPM suspend/hibernate + * event. + * @mdev: pointer to mic_device instance + * + * RETURNS: None. + */ +void mic_complete_resume(struct mic_device *mdev) +{ + if (mdev->state != MIC_SUSPENDED) { + dev_warn(mdev->sdev->parent, "state %d should be %d\n", + mdev->state, MIC_SUSPENDED); + return; + } + + /* Make sure firmware is ready */ + if (!mdev->ops->is_fw_ready(mdev)) + mic_stop(mdev, true); + + mutex_lock(&mdev->mic_mutex); + mic_set_state(mdev, MIC_OFFLINE); + mutex_unlock(&mdev->mic_mutex); +} + +/** + * mic_prepare_suspend - Handle suspend notification for the MIC device. + * @mdev: pointer to mic_device instance + * + * RETURNS: None. + */ +void mic_prepare_suspend(struct mic_device *mdev) +{ + int rc; + +#define MIC_SUSPEND_TIMEOUT (60 * HZ) + + mutex_lock(&mdev->mic_mutex); + switch (mdev->state) { + case MIC_OFFLINE: + /* + * Card is already offline. Set state to MIC_SUSPENDED + * to prevent users from booting the card. + */ + mic_set_state(mdev, MIC_SUSPENDED); + mutex_unlock(&mdev->mic_mutex); + break; + case MIC_ONLINE: + /* + * Card is online. Set state to MIC_SUSPENDING and notify + * MIC user space daemon which will issue card + * shutdown and reset. + */ + mic_set_state(mdev, MIC_SUSPENDING); + mutex_unlock(&mdev->mic_mutex); + rc = wait_for_completion_timeout(&mdev->reset_wait, + MIC_SUSPEND_TIMEOUT); + /* Force reset the card if the shutdown completion timed out */ + if (!rc) { + mutex_lock(&mdev->mic_mutex); + mic_set_state(mdev, MIC_SUSPENDED); + mutex_unlock(&mdev->mic_mutex); + mic_stop(mdev, true); + } + break; + case MIC_SHUTTING_DOWN: + /* + * Card is shutting down. Set state to MIC_SUSPENDED + * to prevent further boot of the card. + */ + mic_set_state(mdev, MIC_SUSPENDED); + mutex_unlock(&mdev->mic_mutex); + rc = wait_for_completion_timeout(&mdev->reset_wait, + MIC_SUSPEND_TIMEOUT); + /* Force reset the card if the shutdown completion timed out */ + if (!rc) + mic_stop(mdev, true); + break; + default: + mutex_unlock(&mdev->mic_mutex); + break; + } +} + +/** + * mic_suspend - Initiate MIC suspend. Suspend merely issues card shutdown. + * @mdev: pointer to mic_device instance + * + * RETURNS: None. + */ +void mic_suspend(struct mic_device *mdev) +{ + struct mic_bootparam *bootparam = mdev->dp; + s8 db = bootparam->h2c_shutdown_db; + + mutex_lock(&mdev->mic_mutex); + if (MIC_SUSPENDING == mdev->state && db != -1) { + bootparam->shutdown_card = 1; + mdev->ops->send_intr(mdev, db); + mic_set_state(mdev, MIC_SUSPENDED); + } + mutex_unlock(&mdev->mic_mutex); +} |