Re: [PATCH 4/5] net: ethernet: bgmac: add NS2 support

[Ray Jui <ray.jui@broadcom.com>]

On 10/27/2016 1:51 PM, Jon Mason wrote:
> On Wed, Oct 26, 2016 at 02:50:39PM -0700, Florian Fainelli wrote:
>> On 10/26/2016 12:36 PM, Jon Mason wrote:
>>> Add support for the variant of amac hardware present in the Broadcom
>>> Northstar2 based SoCs.  Northstar2 requires an additional register to be
>>> configured with the port speed/duplexity (NICPM).  This can be added to
>>> the link callback to hide it from the instances that do not use this.
>>> Also, the bgmac_chip_reset() was intentionally removed to prevent the
>>> resetting of the chip to the default values on open.  Finally, clearing
>>> of the pending interrupts on init is required due to observed issues on
>>> some platforms.
>>>
>>> Signed-off-by: Jon Mason <jon.mason@broadcom.com>
>>> ---
>>
>>> +static void bgmac_nicpm_speed_set(struct net_device *net_dev)
>>> +{
>>> +	struct bgmac *bgmac = netdev_priv(net_dev);
>>> +	u32 val;
>>> +
>>> +	if (!bgmac->plat.nicpm_base)
>>> +		return;
>>> +
>>> +	val = NICPM_IOMUX_CTRL_INIT_VAL;
>>> +	switch (bgmac->net_dev->phydev->speed) {
>>> +	default:
>>> +		pr_err("Unsupported speed.  Defaulting to 1000Mb\n");
>>> +	case SPEED_1000:
>>> +		val |= NICPM_IOMUX_CTRL_SPD_1000M << NICPM_IOMUX_CTRL_SPD_SHIFT;
>>> +		break;
>>> +	case SPEED_100:
>>> +		val |= NICPM_IOMUX_CTRL_SPD_100M << NICPM_IOMUX_CTRL_SPD_SHIFT;
>>> +		break;
>>> +	case SPEED_10:
>>> +		val |= NICPM_IOMUX_CTRL_SPD_10M << NICPM_IOMUX_CTRL_SPD_SHIFT;
>>> +		break;
>>> +	}
>>> +
>>> +	writel(val, bgmac->plat.nicpm_base + NICPM_IOMUX_CTRL);
>>> +
>>> +	usleep_range(10, 100);
>>
>> Does not seem like a good idea, do you need that sleep?
> 
> Oops, that's not supposed to be there.  Removed.
> 
> 
>>> +
>>> +	bgmac_adjust_link(bgmac->net_dev);
>>> +}
>>> +
>>>  static int platform_phy_connect(struct bgmac *bgmac)
>>>  {
>>>  	struct phy_device *phy_dev;
>>>  
>>> -	phy_dev = of_phy_get_and_connect(bgmac->net_dev, bgmac->dev->of_node,
>>> -					 bgmac_adjust_link);
>>> +	if (bgmac->plat.nicpm_base)
>>> +		phy_dev = of_phy_get_and_connect(bgmac->net_dev,
>>> +						 bgmac->dev->of_node,
>>> +						 bgmac_nicpm_speed_set);
>>> +	else
>>> +		phy_dev = of_phy_get_and_connect(bgmac->net_dev,
>>> +						 bgmac->dev->of_node,
>>> +						 bgmac_adjust_link);
>>>  	if (!phy_dev) {
>>>  		dev_err(bgmac->dev, "Phy connect failed\n");
>>>  		return -ENODEV;
>>>  	}
>>>  
>>> +	if (bgmac->feature_flags & BGMAC_FEAT_LANE_SWAP)
>>> +		phy_dev->dev_flags |= PHY_BRCM_EXP_LANE_SWAP;
>>> +
>>>  	return 0;
>>>  }
>>>  
>>> @@ -140,6 +188,9 @@ static int bgmac_probe(struct platform_device *pdev)
>>>  
>>>  	platform_set_drvdata(pdev, bgmac);
>>>  
>>> +	if (of_property_read_bool(np, "brcm,enet-phy-lane-swap"))
>>> +		bgmac->feature_flags |= BGMAC_FEAT_LANE_SWAP;
>>> +
>>>  	/* Set the features of the 4707 family */
>>>  	bgmac->feature_flags |= BGMAC_FEAT_CLKCTLST;
>>>  	bgmac->feature_flags |= BGMAC_FEAT_NO_RESET;
>>> @@ -182,6 +233,14 @@ static int bgmac_probe(struct platform_device *pdev)
>>>  	if (IS_ERR(bgmac->plat.idm_base))
>>>  		return PTR_ERR(bgmac->plat.idm_base);
>>>  
>>> +	regs = platform_get_resource_byname(pdev, IORESOURCE_MEM, "nicpm_base");
>>> +	if (regs) {
>>> +		bgmac->plat.nicpm_base = devm_ioremap_resource(&pdev->dev,
>>> +							       regs);
>>> +		if (IS_ERR(bgmac->plat.nicpm_base))
>>> +			return PTR_ERR(bgmac->plat.nicpm_base);
>>> +	}
>>> +
>>>  	bgmac->read = platform_bgmac_read;
>>>  	bgmac->write = platform_bgmac_write;
>>>  	bgmac->idm_read = platform_bgmac_idm_read;
>>> @@ -213,6 +272,7 @@ static int bgmac_remove(struct platform_device *pdev)
>>>  static const struct of_device_id bgmac_of_enet_match[] = {
>>>  	{.compatible = "brcm,amac",},
>>>  	{.compatible = "brcm,nsp-amac",},
>>> +	{.compatible = "brcm,ns2-amac",},
>>>  	{},
>>>  };
>>>  
>>> diff --git a/drivers/net/ethernet/broadcom/bgmac.c b/drivers/net/ethernet/broadcom/bgmac.c
>>> index 38876ec..1796208 100644
>>> --- a/drivers/net/ethernet/broadcom/bgmac.c
>>> +++ b/drivers/net/ethernet/broadcom/bgmac.c
>>> @@ -1082,6 +1082,9 @@ static void bgmac_enable(struct bgmac *bgmac)
>>>  /* http://bcm-v4.sipsolutions.net/mac-gbit/gmac/chipinit */
>>>  static void bgmac_chip_init(struct bgmac *bgmac)
>>>  {
>>> +	/* Clear any erroneously pending interrupts */
>>> +	bgmac_write(bgmac, BGMAC_INT_STATUS, ~0);
>>> +
>>>  	/* 1 interrupt per received frame */
>>>  	bgmac_write(bgmac, BGMAC_INT_RECV_LAZY, 1 << BGMAC_IRL_FC_SHIFT);
>>>  
>>> @@ -1158,8 +1161,6 @@ static int bgmac_open(struct net_device *net_dev)
>>>  	struct bgmac *bgmac = netdev_priv(net_dev);
>>>  	int err = 0;
>>>  
>>> -	bgmac_chip_reset(bgmac);
>>> -
>>
>> Is this removal intentional? Maybe it should be special cased with
>> checking for a NS2 BGMAC instance and not do it in that case?
> 
> The reset seems completely unnecessary.  There is already 2 resets in
> the probe routine, another reset serves no purpose.  I can add it
> back, as it does not seem to have the negative effect I was seeing
> before.

After repeated ifconfig down/up, does Ethernet still work with this
reset removed?

Thanks.

> 
> Of course, if I remove this one I should remove the reset in the close
> too (which seems even more unnecessary, but I didn't remove it).
> 
> Thanks,
> Jon
> 
>> -- 
>> Florian