linux-kernel - [PATCH] reset: add socfpga_reset

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Message-ID: <1414165990-23958-1-git-send-email-dinguyen@opensource.altera.com>
Date:	Fri, 24 Oct 2014 10:53:10 -0500
From:	<dinguyen@...nsource.altera.com>
To:	<p.zabel@...gutronix.de>
CC:	<dinh.linux@...il.com>, <s.trumtrar@...gutronix.de>,
	<atull@...nsource.altera.com>, <linux-kernel@...r.kernel.org>,
	Dinh Nguyen <dinguyen@...nsource.altera.com>
Subject: [PATCH] reset: add socfpga_reset_status

From: Dinh Nguyen <dinguyen@...nsource.altera.com>

Populate the reset_status callback for SOCFPGA.

Signed-off-by: Alan Tull <atull@...nsource.altera.com>
Signed-off-by: Dinh Nguyen <dinguyen@...nsource.altera.com>
---
 drivers/reset/reset-socfpga.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/drivers/reset/reset-socfpga.c b/drivers/reset/reset-socfpga.c
index 79c32ca..cd37849 100644
--- a/drivers/reset/reset-socfpga.c
+++ b/drivers/reset/reset-socfpga.c
@@ -76,9 +76,27 @@ static int socfpga_reset_deassert(struct reset_controller_dev *rcdev,
 	return 0;
 }
 
+static int socfpga_reset_status(struct reset_controller_dev *rcdev,
+				unsigned long id)
+{
+	struct socfpga_reset_data *data = container_of(rcdev,
+						struct socfpga_reset_data, rcdev);
+	int bank = id / BITS_PER_LONG;
+	int offset = id % BITS_PER_LONG;
+	unsigned long flags;
+	u32 reg;
+
+	spin_lock_irqsave(&data->lock, flags);
+	reg = readl(data->membase + OFFSET_MODRST + (bank * NR_BANKS));
+	spin_unlock_irqrestore(&data->lock, flags);
+
+	return !(reg & BIT(offset));
+}
+
 static struct reset_control_ops socfpga_reset_ops = {
 	.assert		= socfpga_reset_assert,
 	.deassert	= socfpga_reset_deassert,
+	.status		= socfpga_reset_status,
 };
 
 static int socfpga_reset_probe(struct platform_device *pdev)
-- 
2.0.3

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