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Date: Tue, 8 Jan 2013 23:07:31 +0200
From: Tomas Winkler <tomas.winkler@...el.com>
To: gregkh@...uxfoundation.org
Cc: arnd@...db.de, alan@...ux.intel.com, linux-kernel@...r.kernel.org,
Tomas Winkler <tomas.winkler@...el.com>
Subject: [char-misc-next 20/21] mei: make host csr and me csr internal to hw-me
Move csr reading into me hardware functional calls.
Since we gave up on registers caching we remove some of the unnecessary
queries in mei_hw_init ane mei_reset functions.
We add mei_hw_config function to wrap up host buffer depth configuration.
Signed-off-by: Tomas Winkler <tomas.winkler@...el.com>
---
drivers/misc/mei/hw-me.c | 19 ++++++++++--
drivers/misc/mei/init.c | 63 ++++++++++++-----------------------------
drivers/misc/mei/interrupt.c | 4 --
drivers/misc/mei/mei_dev.h | 4 +-
4 files changed, 37 insertions(+), 53 deletions(-)
diff --git a/drivers/misc/mei/hw-me.c b/drivers/misc/mei/hw-me.c
index 3190027..93a2a56 100644
--- a/drivers/misc/mei/hw-me.c
+++ b/drivers/misc/mei/hw-me.c
@@ -67,7 +67,7 @@ u32 mei_mecbrw_read(const struct mei_device *dev)
*
* returns ME_CSR_HA register value (u32)
*/
-u32 mei_mecsr_read(const struct mei_device *dev)
+static inline u32 mei_mecsr_read(const struct mei_device *dev)
{
return mei_reg_read(dev, ME_CSR_HA);
}
@@ -79,7 +79,7 @@ u32 mei_mecsr_read(const struct mei_device *dev)
*
* returns H_CSR register value (u32)
*/
-u32 mei_hcsr_read(const struct mei_device *dev)
+static inline u32 mei_hcsr_read(const struct mei_device *dev)
{
return mei_reg_read(dev, H_CSR);
}
@@ -96,6 +96,18 @@ static inline void mei_hcsr_set(struct mei_device *dev, u32 hcsr)
mei_reg_write(dev, H_CSR, hcsr);
}
+
+/**
+ * me_hw_config - configure hw dependent settings
+ *
+ * @dev: mei device
+ */
+void mei_hw_config(struct mei_device *dev)
+{
+ u32 hcsr = mei_hcsr_read(dev);
+ /* Doesn't change in runtime */
+ dev->hbuf_depth = (hcsr & H_CBD) >> 24;
+}
/**
* mei_clear_interrupts - clear and stop interrupts
*
@@ -183,6 +195,7 @@ void mei_host_set_ready(struct mei_device *dev)
*/
bool mei_host_is_ready(struct mei_device *dev)
{
+ dev->host_hw_state = mei_hcsr_read(dev);
return (dev->host_hw_state & H_RDY) == H_RDY;
}
@@ -194,6 +207,7 @@ bool mei_host_is_ready(struct mei_device *dev)
*/
bool mei_me_is_ready(struct mei_device *dev)
{
+ dev->me_hw_state = mei_mecsr_read(dev);
return (dev->me_hw_state & ME_RDY_HRA) == ME_RDY_HRA;
}
@@ -313,7 +327,6 @@ int mei_write_message(struct mei_device *dev, struct mei_msg_hdr *header,
hcsr = mei_hcsr_read(dev) | H_IG;
mei_hcsr_set(dev, hcsr);
- dev->me_hw_state = mei_mecsr_read(dev);
if (!mei_me_is_ready(dev))
return -EIO;
diff --git a/drivers/misc/mei/init.c b/drivers/misc/mei/init.c
index d0ee02a..98a7fc1 100644
--- a/drivers/misc/mei/init.c
+++ b/drivers/misc/mei/init.c
@@ -89,82 +89,64 @@ struct mei_device *mei_device_init(struct pci_dev *pdev)
*/
int mei_hw_init(struct mei_device *dev)
{
- int err = 0;
- int ret;
+ int ret = 0;
mutex_lock(&dev->device_lock);
- dev->host_hw_state = mei_hcsr_read(dev);
- dev->me_hw_state = mei_mecsr_read(dev);
- dev_dbg(&dev->pdev->dev, "host_hw_state = 0x%08x, mestate = 0x%08x.\n",
- dev->host_hw_state, dev->me_hw_state);
-
/* acknowledge interrupt and stop interupts */
mei_clear_interrupts(dev);
- /* Doesn't change in runtime */
- dev->hbuf_depth = (dev->host_hw_state & H_CBD) >> 24;
+ mei_hw_config(dev);
dev->recvd_msg = false;
dev_dbg(&dev->pdev->dev, "reset in start the mei device.\n");
mei_reset(dev, 1);
- dev_dbg(&dev->pdev->dev, "host_hw_state = 0x%08x, me_hw_state = 0x%08x.\n",
- dev->host_hw_state, dev->me_hw_state);
-
/* wait for ME to turn on ME_RDY */
if (!dev->recvd_msg) {
mutex_unlock(&dev->device_lock);
- err = wait_event_interruptible_timeout(dev->wait_recvd_msg,
+ ret = wait_event_interruptible_timeout(dev->wait_recvd_msg,
dev->recvd_msg,
mei_secs_to_jiffies(MEI_INTEROP_TIMEOUT));
mutex_lock(&dev->device_lock);
}
- if (err <= 0 && !dev->recvd_msg) {
+ if (ret <= 0 && !dev->recvd_msg) {
dev->dev_state = MEI_DEV_DISABLED;
dev_dbg(&dev->pdev->dev,
"wait_event_interruptible_timeout failed"
"on wait for ME to turn on ME_RDY.\n");
- ret = -ENODEV;
- goto out;
+ goto err;
}
- if (!(mei_host_is_ready(dev) && mei_me_is_ready(dev))) {
- dev->dev_state = MEI_DEV_DISABLED;
-
- dev_dbg(&dev->pdev->dev,
- "host_hw_state = 0x%08x, me_hw_state = 0x%08x.\n",
- dev->host_hw_state, dev->me_hw_state);
-
- if (!mei_host_is_ready(dev))
- dev_dbg(&dev->pdev->dev, "host is not ready.\n");
- if (!mei_me_is_ready(dev))
- dev_dbg(&dev->pdev->dev, "ME is not ready.\n");
+ if (!mei_host_is_ready(dev)) {
+ dev_err(&dev->pdev->dev, "host is not ready.\n");
+ goto err;
+ }
- dev_err(&dev->pdev->dev, "link layer initialization failed.\n");
- ret = -ENODEV;
- goto out;
+ if (!mei_me_is_ready(dev)) {
+ dev_err(&dev->pdev->dev, "ME is not ready.\n");
+ goto err;
}
if (dev->version.major_version != HBM_MAJOR_VERSION ||
dev->version.minor_version != HBM_MINOR_VERSION) {
dev_dbg(&dev->pdev->dev, "MEI start failed.\n");
- ret = -ENODEV;
- goto out;
+ goto err;
}
dev->recvd_msg = false;
- dev_dbg(&dev->pdev->dev, "host_hw_state = 0x%08x, me_hw_state = 0x%08x.\n",
- dev->host_hw_state, dev->me_hw_state);
dev_dbg(&dev->pdev->dev, "link layer has been established.\n");
- ret = 0;
-out:
mutex_unlock(&dev->device_lock);
- return ret;
+ return 0;
+err:
+ dev_err(&dev->pdev->dev, "link layer initialization failed.\n");
+ dev->dev_state = MEI_DEV_DISABLED;
+ mutex_unlock(&dev->device_lock);
+ return -ENODEV;
}
/**
@@ -221,13 +203,6 @@ void mei_reset(struct mei_device *dev, int interrupts_enabled)
dev->rd_msg_hdr = 0;
dev->wd_pending = false;
- /* update the state of the registers after reset */
- dev->host_hw_state = mei_hcsr_read(dev);
- dev->me_hw_state = mei_mecsr_read(dev);
-
- dev_dbg(&dev->pdev->dev, "after reset host_hw_state = 0x%08x, me_hw_state = 0x%08x.\n",
- dev->host_hw_state, dev->me_hw_state);
-
if (unexpected)
dev_warn(&dev->pdev->dev, "unexpected reset: dev_state = %s\n",
mei_dev_state_str(dev->dev_state));
diff --git a/drivers/misc/mei/interrupt.c b/drivers/misc/mei/interrupt.c
index 27374b6..b04ed9b 100644
--- a/drivers/misc/mei/interrupt.c
+++ b/drivers/misc/mei/interrupt.c
@@ -697,8 +697,6 @@ irqreturn_t mei_interrupt_thread_handler(int irq, void *dev_id)
if (pci_dev_msi_enabled(dev->pdev))
mei_clear_interrupts(dev);
- dev->me_hw_state = mei_mecsr_read(dev);
-
/* check if ME wants a reset */
if (!mei_me_is_ready(dev) &&
dev->dev_state != MEI_DEV_RESETING &&
@@ -709,7 +707,6 @@ irqreturn_t mei_interrupt_thread_handler(int irq, void *dev_id)
return IRQ_HANDLED;
}
- dev->host_hw_state = mei_hcsr_read(dev);
/* check if we need to start the dev */
if (!mei_host_is_ready(dev)) {
if (mei_me_is_ready(dev)) {
@@ -746,7 +743,6 @@ irqreturn_t mei_interrupt_thread_handler(int irq, void *dev_id)
rets = mei_irq_thread_write_handler(dev, &complete_list);
end:
dev_dbg(&dev->pdev->dev, "end of bottom half function.\n");
- dev->host_hw_state = mei_hcsr_read(dev);
dev->mei_host_buffer_is_empty = mei_hbuf_is_empty(dev);
bus_message_received = false;
diff --git a/drivers/misc/mei/mei_dev.h b/drivers/misc/mei/mei_dev.h
index ae4c5ff..d6589d0 100644
--- a/drivers/misc/mei/mei_dev.h
+++ b/drivers/misc/mei/mei_dev.h
@@ -385,12 +385,12 @@ void mei_watchdog_unregister(struct mei_device *dev);
* Register Access Function
*/
+void mei_hw_config(struct mei_device *dev);
void mei_hw_reset(struct mei_device *dev, bool intr_enable);
-u32 mei_hcsr_read(const struct mei_device *dev);
-u32 mei_mecsr_read(const struct mei_device *dev);
u32 mei_mecbrw_read(const struct mei_device *dev);
+
void mei_clear_interrupts(struct mei_device *dev);
void mei_enable_interrupts(struct mei_device *dev);
void mei_disable_interrupts(struct mei_device *dev);
--
1.7.4.4
--
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