[U-Boot] [PATCH v4] Gbe Controller driver support for kirkwood SOCs

[Stefan Roese <sr@denx.de>]

Hi Prafulla,

On Thursday 21 May 2009 22:24:32 Prafulla Wadaskar wrote:
> Contributors:
> Yotam Admon <yotam@marvell.com>
> Michael Blostein <michaelbl@marvell.com
>
> Reviewed by: Ronen Shitrit <rshitrit@marvell.com>
> Signed-off-by: Prafulla Wadaskar <prafulla@marvell.com>
> ---
> Change log:
> v2: entire rewrite/restructure of v1
> used small names for variable/function names
> readl/writel used to access SoC registers
> Soc registers accssed using pointers through net device struct
> miiphy registration done for external smi read/write access
> miiphy_link used to detect phy link presence
> cleaned for cosmetic changes

Please find a comment below.

> diff --git a/drivers/net/kirkwood_egiga.h b/drivers/net/kirkwood_egiga.h
> new file mode 100644
> index 0000000..9f3908e
> --- /dev/null
> +++ b/drivers/net/kirkwood_egiga.h
> @@ -0,0 +1,828 @@
> +/*
> + * (C) Copyright 2009
> + * Marvell Semiconductor <www.marvell.com>
> + * Prafulla Wadaskar <prafulla@marvell.com>
> + *
> + * based on - Driver for MV64360X ethernet ports
> + * Copyright (C) 2002 rabeeh at galileo.co.il
> + *
> + * See file CREDITS for list of people who contributed to this
> + * project.
> + *
> + * This program is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU General Public License as
> + * published by the Free Software Foundation; either version 2 of
> + * the License, or (at your option) any later version.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License
> + * along with this program; if not, write to the Free Software
> + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
> + * MA 02110-1301 USA
> + */
> +
> +#ifndef __EGIGA_H__
> +#define __EGIGA_H__
> +
> +#define MAX_KWGBE_DEVS	2	/*controller has two ports */

<snip>

> +/* Default port serial control value */
> +#define PORT_SERIAL_CONTROL_VALUE_TMP		  \
> +	KWGBE_FORCE_LINK_PASS			| \
> +	KWGBE_DIS_AUTO_NEG_FOR_DUPLX		| \
> +	KWGBE_DIS_AUTO_NEG_FOR_FLOW_CTRL	| \
> +	KWGBE_ADV_NO_FLOW_CTRL			| \
> +	KWGBE_FORCE_FC_MODE_NO_PAUSE_DIS_TX	| \
> +	KWGBE_FORCE_BP_MODE_NO_JAM		| \
> +	(1 << 9)					| \
> +	KWGBE_DO_NOT_FORCE_LINK_FAIL		| \
> +	KWGBE_DIS_AUTO_NEG_SPEED_GMII		| \

You disable speed auto-negotiation here. Why are you doing this? Using auto-
negotiation should be the default operation mode from my point of view.

> +	KWGBE_DTE_ADV_0				| \
> +	KWGBE_MIIPHY_MAC_MODE			| \
> +	KWGBE_AUTO_NEG_NO_CHANGE			| \
> +	KWGBE_MAX_RX_PACKET_1552BYTE		| \
> +	KWGBE_CLR_EXT_LOOPBACK			| \
> +	KWGBE_SET_FULL_DUPLEX_MODE		| \
> +	KWGBE_DIS_FLOW_CTRL_TX_RX_IN_FULL_DUPLEX | \
> +	KWGBE_SET_MII_SPEED_TO_100
> +
> +#ifdef CONFIG_SYS_MII_MODE
> +#define PORT_SERIAL_CONTROL_VALUE	\
> +	PORT_SERIAL_CONTROL_VALUE_TMP |	\
> +	KWGBE_SET_GMII_SPEED_TO_10_100
> +#else
> +#define PORT_SERIAL_CONTROL_VALUE	\
> +	PORT_SERIAL_CONTROL_VALUE_TMP |	\
> +	KWGBE_SET_GMII_SPEED_TO_1000
> +#endif

If you need a fixed link speed configuration we should perhaps add a 
configuration option for this. What do you think?

Best regards,
Stefan

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