[<prev] [next>] [<thread-prev] [day] [month] [year] [list]
Date: Mon, 09 Sep 2013 13:20:35 +0200
From: Marc Kleine-Budde <mkl@...gutronix.de>
To: Benedikt Spranger <b.spranger@...utronix.de>
CC: netdev@...r.kernel.org,
Alexander Frank <Alexander.Frank@...rspaecher.com>,
Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
Holger Dengler <dengler@...utronix.de>,
"linux-can@...r.kernel.org" <linux-can@...r.kernel.org>
Subject: Re: [PATCH 09/16] c_can: expicit 32bit access on D_CAN to message
buffer data register
On 09/09/2013 09:25 AM, Benedikt Spranger wrote:
> change the 16bit access of ARB1_REG and DATA1/2_REG to a 32bit access.
>
> Signed-off-by: Benedikt Spranger <b.spranger@...utronix.de>
> ---
> drivers/net/can/c_can/c_can.c | 19 ++++++++++---------
> 1 file changed, 10 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/net/can/c_can/c_can.c b/drivers/net/can/c_can/c_can.c
> index 4b94f2d..c573399 100644
> --- a/drivers/net/can/c_can/c_can.c
> +++ b/drivers/net/can/c_can/c_can.c
> @@ -360,7 +360,6 @@ static inline void c_can_object_put(struct net_device *dev,
> static void c_can_write_msg_object(struct net_device *dev,
> int iface, struct can_frame *frame, int objno)
> {
> - int i;
> u32 flags = IF_ARB_MSGVAL;
> unsigned int id;
> struct c_can_priv *priv = netdev_priv(dev);
> @@ -376,15 +375,17 @@ static void c_can_write_msg_object(struct net_device *dev,
>
> id |= flags;
>
> - priv->write_reg(priv, C_CAN_IFACE(ARB1_REG, iface),
> - IFX_WRITE_LOW_16BIT(id));
> - priv->write_reg(priv, C_CAN_IFACE(ARB2_REG, iface),
> - IFX_WRITE_HIGH_16BIT(id));
> + c_can_writereg32(priv, C_CAN_IFACE(ARB1_REG, iface),
> + IFX_WRITE_HIGH_16BIT(id),
> + IFX_WRITE_LOW_16BIT(id));
> +
> + c_can_writereg32(priv, C_CAN_IFACE(DATA1_REG, iface),
> + frame->data[2] | frame->data[3] << 8,
> + frame->data[0] | frame->data[1] << 8);
You can use something like beXX_to_cpup((__be32 *)&cf->data[0]) here.
>
> - for (i = 0; i < frame->can_dlc; i += 2) {
> - priv->write_reg(priv, C_CAN_IFACE(DATA1_REG, iface) + i / 2,
> - frame->data[i] | (frame->data[i + 1] << 8));
> - }
> + c_can_writereg32(priv, C_CAN_IFACE(DATA3_REG, iface),
> + frame->data[6] | frame->data[7] << 8,
> + frame->data[4] | frame->data[5] << 8);
You write here the upper 32 bit unconditionally, the original code doesn't.
Marc
--
Pengutronix e.K. | Marc Kleine-Budde |
Industrial Linux Solutions | Phone: +49-231-2826-924 |
Vertretung West/Dortmund | Fax: +49-5121-206917-5555 |
Amtsgericht Hildesheim, HRA 2686 | http://www.pengutronix.de |
Download attachment "signature.asc" of type "application/pgp-signature" (260 bytes)
Powered by blists - more mailing lists