linux-kernel - [char-misc-next 03/13] mei: me: add power gating isolation register write wrappers

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Date:	Tue, 18 Mar 2014 22:51:57 +0200
From:	Tomas Winkler <tomas.winkler@...el.com>
To:	gregkh@...uxfoundation.org
Cc:	arnd@...db.de, rjw@...ysocki.net, linux-kernel@...r.kernel.org,
	linux-pm@...r.kernel.org, Tomas Winkler <tomas.winkler@...el.com>,
	Alexander Usyskin <alexander.usyskin@...el.com>
Subject: [char-misc-next 03/13] mei: me: add power gating isolation register write wrappers

Add entry and exit power gating isolation register
write handler.

Signed-off-by: Tomas Winkler <tomas.winkler@...el.com>
Signed-off-by: Alexander Usyskin <alexander.usyskin@...el.com>
---
 drivers/misc/mei/hw-me.c | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

diff --git a/drivers/misc/mei/hw-me.c b/drivers/misc/mei/hw-me.c
index 8dbdaae..fc5d001 100644
--- a/drivers/misc/mei/hw-me.c
+++ b/drivers/misc/mei/hw-me.c
@@ -431,6 +431,35 @@ static int mei_me_read_slots(struct mei_device *dev, unsigned char *buffer,
 }
 
 /**
+ * mei_me_pg_enter - write pg enter register to mei device.
+ *
+ * @dev: the device structure
+ */
+static void mei_me_pg_enter(struct mei_device *dev)
+{
+	struct mei_me_hw *hw = to_me_hw(dev);
+	u32 reg = mei_me_reg_read(hw, H_HPG_CSR);
+	reg |= H_HPG_CSR_PGI;
+	mei_me_reg_write(hw, H_HPG_CSR, reg);
+}
+
+/**
+ * mei_me_pg_enter - write pg enter register to mei device.
+ *
+ * @dev: the device structure
+ */
+static void mei_me_pg_exit(struct mei_device *dev)
+{
+	struct mei_me_hw *hw = to_me_hw(dev);
+	u32 reg = mei_me_reg_read(hw, H_HPG_CSR);
+
+	WARN(!(reg & H_HPG_CSR_PGI), "PGI is not set\n");
+
+	reg |= H_HPG_CSR_PGIHEXR;
+	mei_me_reg_write(hw, H_HPG_CSR, reg);
+}
+
+/**
  * mei_me_irq_quick_handler - The ISR of the MEI device
  *
  * @irq: The irq number
-- 
1.8.5.3

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