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mei: add hw start callback 

This callback wraps up hardware dependent details
of the hardware initialization.

This callback also contains host ready setting
so we can remove host_set_ready callback

In ME we switch to waiting on event so
we can streamline the initialization flow.

Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Tomas Winkler 2013-03-11 18:27:03 +02:00 committed by Greg Kroah-Hartman
parent c8c8d080ed
commit aafae7ecd8
3 changed files with 62 additions and 15 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

43
drivers/misc/mei/hw-me.c
View File

@ -222,6 +222,38 @@ static bool mei_me_hw_is_ready(struct mei_device *dev)
return (hw->me_hw_state & ME_RDY_HRA) == ME_RDY_HRA;
}
static int mei_me_hw_ready_wait(struct mei_device *dev)
{
int err;
if (mei_me_hw_is_ready(dev))
return 0;
mutex_unlock(&dev->device_lock);
err = wait_event_interruptible_timeout(dev->wait_hw_ready,
dev->recvd_hw_ready, MEI_INTEROP_TIMEOUT);
mutex_lock(&dev->device_lock);
if (!err && !dev->recvd_hw_ready) {
dev_err(&dev->pdev->dev,
"wait hw ready failed. status = 0x%x\n", err);
return -ETIMEDOUT;
}
dev->recvd_hw_ready = false;
return 0;
}
static int mei_me_hw_start(struct mei_device *dev)
{
int ret = mei_me_hw_ready_wait(dev);
if (ret)
return ret;
dev_dbg(&dev->pdev->dev, "hw is ready\n");
mei_me_host_set_ready(dev);
return ret;
}
/**
* mei_hbuf_filled_slots - gets number of device filled buffer slots
*
@ -456,14 +488,9 @@ irqreturn_t mei_me_irq_thread_handler(int irq, void *dev_id)
if (mei_hw_is_ready(dev)) {
dev_dbg(&dev->pdev->dev, "we need to start the dev.\n");
mei_host_set_ready(dev);
dev->recvd_hw_ready = true;
wake_up_interruptible(&dev->wait_hw_ready);
dev_dbg(&dev->pdev->dev, "link is established start sending messages.\n");
/* link is established * start sending messages. */
dev->dev_state = MEI_DEV_INIT_CLIENTS;
mei_hbm_start_req(dev);
mutex_unlock(&dev->device_lock);
return IRQ_HANDLED;
} else {
@ -521,12 +548,12 @@ end:
}
static const struct mei_hw_ops mei_me_hw_ops = {
.host_set_ready = mei_me_host_set_ready,
.host_is_ready = mei_me_host_is_ready,
.hw_is_ready = mei_me_hw_is_ready,
.hw_reset = mei_me_hw_reset,
.hw_config = mei_me_hw_config,
.hw_start = mei_me_hw_start,
.intr_clear = mei_me_intr_clear,
.intr_enable = mei_me_intr_enable,

16
drivers/misc/mei/init.c
View File

@ -22,6 +22,7 @@
#include <linux/mei.h>
#include "mei_dev.h"
#include "hbm.h"
#include "client.h"
const char *mei_dev_state_str(int state)
@ -47,6 +48,7 @@ void mei_device_init(struct mei_device *dev)
/* setup our list array */
INIT_LIST_HEAD(&dev->file_list);
mutex_init(&dev->device_lock);
init_waitqueue_head(&dev->wait_hw_ready);
init_waitqueue_head(&dev->wait_recvd_msg);
init_waitqueue_head(&dev->wait_stop_wd);
dev->dev_state = MEI_DEV_INITIALIZING;
@ -176,6 +178,20 @@ void mei_reset(struct mei_device *dev, int interrupts_enabled)
dev_warn(&dev->pdev->dev, "unexpected reset: dev_state = %s\n",
mei_dev_state_str(dev->dev_state));
if (!interrupts_enabled) {
dev_dbg(&dev->pdev->dev, "intr not enabled end of reset\n");
return;
}
mei_hw_start(dev);
dev_dbg(&dev->pdev->dev, "link is established start sending messages.\n");
/* link is established * start sending messages. */
dev->dev_state = MEI_DEV_INIT_CLIENTS;
mei_hbm_start_req(dev);
/* wake up all readings so they can be interrupted */
mei_cl_all_read_wakeup(dev);

16
drivers/misc/mei/mei_dev.h
View File

@ -213,11 +213,11 @@ struct mei_cl {
/** struct mei_hw_ops
*
* @host_set_ready - notify FW that host side is ready
* @host_is_ready - query for host readiness
* @hw_is_ready - query if hw is ready
* @hw_reset - reset hw
* @hw_start - start hw after reset
* @hw_config - configure hw
* @intr_clear - clear pending interrupts
@ -237,11 +237,11 @@ struct mei_cl {
*/
struct mei_hw_ops {
void (*host_set_ready) (struct mei_device *dev);
bool (*host_is_ready) (struct mei_device *dev);
bool (*hw_is_ready) (struct mei_device *dev);
void (*hw_reset) (struct mei_device *dev, bool enable);
int (*hw_start) (struct mei_device *dev);
void (*hw_config) (struct mei_device *dev);
void (*intr_clear) (struct mei_device *dev);
@ -296,11 +296,14 @@ struct mei_device {
*/
struct mutex device_lock; /* device lock */
struct delayed_work timer_work; /* MEI timer delayed work (timeouts) */
bool recvd_hw_ready;
bool recvd_msg;
/*
* waiting queue for receive message from FW
*/
wait_queue_head_t wait_hw_ready;
wait_queue_head_t wait_recvd_msg;
wait_queue_head_t wait_stop_wd;
@ -465,6 +468,11 @@ static inline void mei_hw_reset(struct mei_device *dev, bool enable)
dev->ops->hw_reset(dev, enable);
}
static inline void mei_hw_start(struct mei_device *dev)
{
dev->ops->hw_start(dev);
}
static inline void mei_clear_interrupts(struct mei_device *dev)
{
dev->ops->intr_clear(dev);
@ -480,10 +488,6 @@ static inline void mei_disable_interrupts(struct mei_device *dev)
dev->ops->intr_disable(dev);
}
static inline void mei_host_set_ready(struct mei_device *dev)
{
dev->ops->host_set_ready(dev);
}
static inline bool mei_host_is_ready(struct mei_device *dev)
{
return dev->ops->host_is_ready(dev);