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

Hans de Goede
2015-03-20T18:53:55Z

Hi,

On 20-03-15 19:52, Hans de Goede wrote:
> From: Maxime Ripard <maxime.ripard@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@free-electrons.com>
> [hdegoede at redhat.com: Make sure SUNXI_SRAM gets enabled in Kconfig]
> Signed-off-by: Hans de Goede <hdegoede@redhat.com>

Note this patch is only included for completeness / as an example,
it should probably go upstream through the network-drivers tree
once the rest is merged.

Regards,

Hans

> ---
> 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.
>