netdev - [PATCH v4 5/8] net: can: c_can: Add support for START pulse in RAMINIT sequence

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Date:	Fri, 7 Nov 2014 16:49:19 +0200
From:	Roger Quadros <rogerq@...com>
To:	<wg@...ndegger.com>, <mkl@...gutronix.de>
CC:	<wsa@...-dreams.de>, <tony@...mide.com>, <tglx@...utronix.de>,
	<mugunthanvnm@...com>, <george.cherian@...com>, <balbi@...com>,
	<nsekhar@...com>, <nm@...com>,
	<sergei.shtylyov@...entembedded.com>, <linux-omap@...r.kernel.org>,
	<linux-can@...r.kernel.org>, <netdev@...r.kernel.org>,
	Roger Quadros <rogerq@...com>
Subject: [PATCH v4 5/8] net: can: c_can: Add support for START pulse in RAMINIT sequence

Some SoCs e.g. (TI DRA7xx) need a START pulse to start the
RAMINIT sequence i.e. START bit must be set and cleared before
checking for the DONE bit status.

Signed-off-by: Roger Quadros <rogerq@...com>
---
 drivers/net/can/c_can/c_can.h          | 1 +
 drivers/net/can/c_can/c_can_platform.c | 7 +++++++
 2 files changed, 8 insertions(+)

diff --git a/drivers/net/can/c_can/c_can.h b/drivers/net/can/c_can/c_can.h
index 0e17c7b..c6715ca 100644
--- a/drivers/net/can/c_can/c_can.h
+++ b/drivers/net/can/c_can/c_can.h
@@ -185,6 +185,7 @@ struct c_can_raminit {
 	unsigned int reg;	/* register index within syscon */
 	u8 start_bit;
 	u8 done_bit;
+	bool needs_pulse;
 };
 
 /* c_can private data structure */
diff --git a/drivers/net/can/c_can/c_can_platform.c b/drivers/net/can/c_can/c_can_platform.c
index 3776483..b838c6b 100644
--- a/drivers/net/can/c_can/c_can_platform.c
+++ b/drivers/net/can/c_can/c_can_platform.c
@@ -124,6 +124,12 @@ static void c_can_hw_raminit_syscon(const struct c_can_priv *priv, bool enable)
 		ctrl |= 1 << start_bit;
 		regmap_write(raminit->syscon, raminit->reg, ctrl);
 
+		/* clear START bit if start pulse is needed */
+		if (raminit->needs_pulse) {
+			ctrl &= ~(1 << start_bit);
+			regmap_write(raminit->syscon, raminit->reg, ctrl);
+		}
+
 		ctrl |= 1 << done_bit;
 		c_can_hw_raminit_wait_syscon(priv, mask, ctrl);
 	}
@@ -330,6 +336,7 @@ static int c_can_plat_probe(struct platform_device *pdev)
 
 			raminit->start_bit = drvdata->raminit_start_bits[id];
 			raminit->done_bit = drvdata->raminit_done_bits[id];
+			raminit->needs_pulse = drvdata->raminit_pulse;
 
 			priv->raminit = c_can_hw_raminit_syscon;
 		} else {
-- 
1.8.3.2

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