From mboxrd@z Thu Jan 1 00:00:00 1970 From: Marc Kleine-Budde Subject: [PATCH v8 5/8] can: c_can: Add support for START pulse in RAMINIT sequence Date: Fri, 14 Nov 2014 19:09:48 +0100 Message-ID: <1415988591-6032-6-git-send-email-mkl@pengutronix.de> References: <1415988591-6032-1-git-send-email-mkl@pengutronix.de> Return-path: In-Reply-To: <1415988591-6032-1-git-send-email-mkl@pengutronix.de> Sender: linux-can-owner@vger.kernel.org To: linux-can@vger.kernel.org Cc: wsa@the-dreams.de, linux-omap@vger.kernel.org, rogerq@ti.com, kernel@pengutronix.de, Marc Kleine-Budde List-Id: linux-omap@vger.kernel.org From: Roger Quadros 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 Signed-off-by: Marc Kleine-Budde --- 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 28a73d14ea8d..8acdc7fa4792 100644 --- a/drivers/net/can/c_can/c_can.h +++ b/drivers/net/can/c_can/c_can.h @@ -188,6 +188,7 @@ struct c_can_raminit { struct regmap *syscon; /* for raminit ctrl. reg. access */ unsigned int reg; /* register index within syscon */ struct raminit_bits bits; + 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 1fbfa1d59c29..41fa460c3592 100644 --- a/drivers/net/can/c_can/c_can_platform.c +++ b/drivers/net/can/c_can/c_can_platform.c @@ -120,6 +120,12 @@ static void c_can_hw_raminit_syscon(const struct c_can_priv *priv, bool enable) ctrl |= 1 << raminit->bits.start; regmap_write(raminit->syscon, raminit->reg, ctrl); + /* clear START bit if start pulse is needed */ + if (raminit->needs_pulse) { + ctrl &= ~(1 << raminit->bits.start); + regmap_write(raminit->syscon, raminit->reg, ctrl); + } + ctrl |= 1 << raminit->bits.done; c_can_hw_raminit_wait_syscon(priv, mask, ctrl); } @@ -325,6 +331,7 @@ static int c_can_plat_probe(struct platform_device *pdev) } raminit->bits = drvdata->raminit_bits[id]; + raminit->needs_pulse = drvdata->raminit_pulse; priv->raminit = c_can_hw_raminit_syscon; } else { -- 2.1.1