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Message-Id: <201203050841.57291.sr@denx.de>
Date: Mon, 5 Mar 2012 08:41:57 +0100
From: Stefan Roese <sr@...x.de>
To: linuxppc-dev@...ts.ozlabs.org
Cc: Duc Dang <dhdang@....com>,
Benjamin Herrenschmidt <benh@...nel.crashing.org>,
Paul Mackerras <paulus@...ba.org>,
David Miller <davem@...emloft.net>,
Josh Boyer <jwboyer@...il.com>,
netdev <netdev@...r.kernel.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/2] powerpc/44x: Add more changes for APM821XX EMAC driver
On Monday 05 March 2012 05:03:44 Duc Dang wrote:
> This patch includes:
>
> Configure EMAC PHY clock source (clock from PHY or internal clock).
>
> Do not advertise PHY half duplex capability as APM821XX EMAC does not
> support half duplex mode.
>
> Add changes to support configuring jumbo frame for APM821XX EMAC.
>
> Signed-off-by: Duc Dang <dhdang@....com>
> ---
> v2:
> Fix coding style problems.
>
> drivers/net/ethernet/ibm/emac/core.c | 26 +++++++++++++++++++++++++-
> drivers/net/ethernet/ibm/emac/core.h | 13 +++++++++++--
> drivers/net/ethernet/ibm/emac/emac.h | 5 ++++-
> 3 files changed, 40 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/net/ethernet/ibm/emac/core.c
> b/drivers/net/ethernet/ibm/emac/core.c index 2abce96..ad671c5 100644
> --- a/drivers/net/ethernet/ibm/emac/core.c
> +++ b/drivers/net/ethernet/ibm/emac/core.c
> @@ -434,6 +434,11 @@ static inline u32 emac_iff2rmr(struct net_device
> *ndev) else if (!netdev_mc_empty(ndev))
> r |= EMAC_RMR_MAE;
>
> + if (emac_has_feature(dev, EMAC_APM821XX_REQ_JUMBO_FRAME_SIZE)) {
> + r &= ~EMAC4_RMR_MJS_MASK;
> + r |= EMAC4_RMR_MJS(ndev->mtu);
> + }
> +
> return r;
> }
>
> @@ -965,6 +970,7 @@ static int emac_resize_rx_ring(struct emac_instance
> *dev, int new_mtu) int rx_sync_size = emac_rx_sync_size(new_mtu);
> int rx_skb_size = emac_rx_skb_size(new_mtu);
> int i, ret = 0;
> + int mr1_jumbo_bit_change = 0;
>
> mutex_lock(&dev->link_lock);
> emac_netif_stop(dev);
> @@ -1013,7 +1019,14 @@ static int emac_resize_rx_ring(struct emac_instance
> *dev, int new_mtu) }
> skip:
> /* Check if we need to change "Jumbo" bit in MR1 */
> - if ((new_mtu > ETH_DATA_LEN) ^ (dev->ndev->mtu > ETH_DATA_LEN)) {
> + if (emac_has_feature(dev, EMAC_APM821XX_REQ_JUMBO_FRAME_SIZE))
> + mr1_jumbo_bit_change = (new_mtu > ETH_DATA_LEN) ||
> + (dev->ndev->mtu > ETH_DATA_LEN);
> + else
> + mr1_jumbo_bit_change = (new_mtu > ETH_DATA_LEN) ^
> + (dev->ndev->mtu > ETH_DATA_LEN);
> +
> + if (mr1_jumbo_bit_change) {
> /* This is to prevent starting RX channel in emac_rx_enable()
*/
> set_bit(MAL_COMMAC_RX_STOPPED, &dev->commac.flags);
>
> @@ -2471,6 +2484,7 @@ static int __devinit emac_init_phy(struct
> emac_instance *dev)
>
> /* Disable any PHY features not supported by the platform */
> dev->phy.def->features &= ~dev->phy_feat_exc;
> + dev->phy.features &= ~dev->phy_feat_exc;
>
> /* Setup initial link parameters */
> if (dev->phy.features & SUPPORTED_Autoneg) {
> @@ -2568,6 +2582,10 @@ static int __devinit emac_init_config(struct
> emac_instance *dev) if (of_device_is_compatible(np, "ibm,emac-405ex") ||
> of_device_is_compatible(np, "ibm,emac-405exr"))
> dev->features |= EMAC_FTR_440EP_PHY_CLK_FIX;
> + if (of_device_is_compatible(np, "ibm,emac-apm821xx"))
> + dev->features |= (EMAC_APM821XX_REQ_JUMBO_FRAME_SIZE
|
> + EMAC_FTR_APM821XX_NO_HALF_DUPLEX |
> + EMAC_FTR_460EX_PHY_CLK_FIX);
Nitpick: Parentheses for multi line statement please.
> } else if (of_device_is_compatible(np, "ibm,emac4")) {
> dev->features |= EMAC_FTR_EMAC4;
> if (of_device_is_compatible(np, "ibm,emac-440gx"))
> @@ -2818,6 +2836,12 @@ static int __devinit emac_probe(struct
> platform_device *ofdev) dev->stop_timeout = STOP_TIMEOUT_100;
> INIT_DELAYED_WORK(&dev->link_work, emac_link_timer);
>
> + /* Some SoCs like APM821xx does not support Half Duplex mode. */
> + if (emac_has_feature(dev, EMAC_FTR_APM821XX_NO_HALF_DUPLEX))
> + dev->phy_feat_exc = (SUPPORTED_1000baseT_Half |
> + SUPPORTED_100baseT_Half |
> + SUPPORTED_10baseT_Half);
> +
Nitpick: Parentheses for multi line statement please.
> /* Find PHY if any */
> err = emac_init_phy(dev);
> if (err != 0)
> diff --git a/drivers/net/ethernet/ibm/emac/core.h
> b/drivers/net/ethernet/ibm/emac/core.h index fa3ec57..9dea85a 100644
> --- a/drivers/net/ethernet/ibm/emac/core.h
> +++ b/drivers/net/ethernet/ibm/emac/core.h
> @@ -325,7 +325,14 @@ struct emac_instance {
> * Set if we need phy clock workaround for 460ex or 460gt
> */
> #define EMAC_FTR_460EX_PHY_CLK_FIX 0x00000400
> -
> +/*
> + * APM821xx requires Jumbo frame size set explicitly
> + */
> +#define EMAC_APM821XX_REQ_JUMBO_FRAME_SIZE 0x00000800
> +/*
> + * APM821xx does not support Half Duplex mode
> + */
> +#define EMAC_FTR_APM821XX_NO_HALF_DUPLEX 0x00001000
>
> /* Right now, we don't quite handle the always/possible masks on the
> * most optimal way as we don't have a way to say something like
> @@ -353,7 +360,9 @@ enum {
> EMAC_FTR_NO_FLOW_CONTROL_40x |
> #endif
> EMAC_FTR_460EX_PHY_CLK_FIX |
> - EMAC_FTR_440EP_PHY_CLK_FIX,
> + EMAC_FTR_440EP_PHY_CLK_FIX |
> + EMAC_APM821XX_REQ_JUMBO_FRAME_SIZE |
> + EMAC_FTR_APM821XX_NO_HALF_DUPLEX,
> };
>
> static inline int emac_has_feature(struct emac_instance *dev,
> diff --git a/drivers/net/ethernet/ibm/emac/emac.h
> b/drivers/net/ethernet/ibm/emac/emac.h index 1568278..36bcd69 100644
> --- a/drivers/net/ethernet/ibm/emac/emac.h
> +++ b/drivers/net/ethernet/ibm/emac/emac.h
> @@ -212,7 +212,10 @@ struct emac_regs {
> #define EMAC4_RMR_RFAF_64_1024 0x00000006
> #define EMAC4_RMR_RFAF_128_2048 0x00000007
> #define EMAC4_RMR_BASE EMAC4_RMR_RFAF_128_2048
> -
> +#if defined(CONFIG_APM821xx)
> +#define EMAC4_RMR_MJS_MASK 0x0001fff8
> +#define EMAC4_RMR_MJS(s) (((s) << 3) & EMAC4_RMR_MJS_MASK)
> +#endif
Is this "#if defined" really needed? If not, I suggest you drop it.
Thanks,
Stefan
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