[PATCH 5/5] net: allwinner: emac: Claim our SRAM

[Hans de Goede]

Hi,

On 24-03-15 16:22, Maxime Ripard wrote:
> On Fri, Mar 20, 2015 at 07:52:49PM +0100, Hans de Goede wrote:
>> From: Maxime Ripard <maxime.ripard at free-electrons.com>
>>
>> The SRAM the EMAC is using might not have been mapped accordingly by the
>> bootloader, preventing the EMAC to work properly.
>>
>> Ask for that SRAM to be mapped at probe time to make sure that this never
>> happens.
>>
>> Signed-off-by: Maxime Ripard <maxime.ripard at free-electrons.com>
>> [hdegoede at redhat.com: Make sure SUNXI_SRAM gets enabled in Kconfig]
>> Signed-off-by: Hans de Goede <hdegoede at redhat.com>
>> ---
>>   drivers/net/ethernet/allwinner/sun4i-emac.c | 13 +++++++++++--
>>   drivers/net/ethernet/stmicro/stmmac/Kconfig |  1 +
>>   2 files changed, 12 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/net/ethernet/allwinner/sun4i-emac.c b/drivers/net/ethernet/allwinner/sun4i-emac.c
>> index f3470d9..9d0136b 100644
>> --- a/drivers/net/ethernet/allwinner/sun4i-emac.c
>> +++ b/drivers/net/ethernet/allwinner/sun4i-emac.c
>> @@ -29,6 +29,8 @@
>>   #include <linux/platform_device.h>
>>   #include <linux/phy.h>
>>
>> +#include <linux/soc/sunxi/sunxi_sram.h>
>> +
>>   #include "sun4i-emac.h"
>>
>>   #define DRV_NAME		"sun4i-emac"
>> @@ -857,11 +859,15 @@ static int emac_probe(struct platform_device *pdev)
>>
>>   	clk_prepare_enable(db->clk);
>>
>> +	ret = sunxi_sram_claim(SUNXI_SRAM_EMAC, "emac");
>> +	if (ret)
>> +		dev_warn(&pdev->dev, "Couldn't map SRAM to device\n");
>> +
>>   	db->phy_node = of_parse_phandle(np, "phy", 0);
>>   	if (!db->phy_node) {
>>   		dev_err(&pdev->dev, "no associated PHY\n");
>>   		ret = -ENODEV;
>> -		goto out;
>> +		goto out_release_sram;
>>   	}
>>
>>   	/* Read MAC-address from DT */
>> @@ -893,7 +899,7 @@ static int emac_probe(struct platform_device *pdev)
>>   	if (ret) {
>>   		dev_err(&pdev->dev, "Registering netdev failed!\n");
>>   		ret = -ENODEV;
>> -		goto out;
>> +		goto out_release_sram;
>>   	}
>>
>>   	dev_info(&pdev->dev, "%s: at %p, IRQ %d MAC: %pM\n",
>> @@ -901,6 +907,8 @@ static int emac_probe(struct platform_device *pdev)
>>
>>   	return 0;
>>
>> +out_release_sram:
>> +	sunxi_sram_release(SUNXI_SRAM_EMAC);
>>   out:
>>   	dev_err(db->dev, "not found (%d).\n", ret);
>>
>> @@ -914,6 +922,7 @@ static int emac_remove(struct platform_device *pdev)
>>   	struct net_device *ndev = platform_get_drvdata(pdev);
>>
>>   	unregister_netdev(ndev);
>> +	sunxi_sram_release(SUNXI_SRAM_EMAC);
>>   	free_netdev(ndev);
>>
>>   	dev_dbg(&pdev->dev, "released and freed device\n");
>> diff --git a/drivers/net/ethernet/stmicro/stmmac/Kconfig b/drivers/net/ethernet/stmicro/stmmac/Kconfig
>> index 7d3af19..785ca22 100644
>> --- a/drivers/net/ethernet/stmicro/stmmac/Kconfig
>> +++ b/drivers/net/ethernet/stmicro/stmmac/Kconfig
>> @@ -16,6 +16,7 @@ if STMMAC_ETH
>>   config STMMAC_PLATFORM
>>   	tristate "STMMAC Platform bus support"
>>   	depends on STMMAC_ETH
>> +	select SUNXI_SRAM if ARCH_SUNXI
>>   	default y
>>   	---help---
>>   	  This selects the platform specific bus support for the stmmac driver.
>
> Shouldn't that be in emac's Kconfig option instead?

Erm, yes my bad, or rather now that we've made SUNXI_SRAM a hidden option defaulting
to y, it can simply be dropped. I've done that for v2 of the set which I'm about to
send.

Regards,

Hans

>