The EMAC needs SRAM block A3_A4 being mapped to EMAC peripheral to work. This is done by the bootloader most of the time, but U-Boot Falcon Mode, for example, skips emac initialization and SRAM would stay mapped to the CPU.
Signed-off-by: Jens Kuske <[email protected]> --- drivers/net/ethernet/allwinner/Kconfig | 1 + drivers/net/ethernet/allwinner/sun4i-emac.c | 18 ++++++++++++++++++ 2 files changed, 19 insertions(+) diff --git a/drivers/net/ethernet/allwinner/Kconfig b/drivers/net/ethernet/allwinner/Kconfig index d8d95d4..508a288 100644 --- a/drivers/net/ethernet/allwinner/Kconfig +++ b/drivers/net/ethernet/allwinner/Kconfig @@ -28,6 +28,7 @@ config SUN4I_EMAC select MII select PHYLIB select MDIO_SUN4I + select MFD_SYSCON ---help--- Support for Allwinner A10 EMAC ethernet driver. diff --git a/drivers/net/ethernet/allwinner/sun4i-emac.c b/drivers/net/ethernet/allwinner/sun4i-emac.c index 1fcd556..86c891d 100644 --- a/drivers/net/ethernet/allwinner/sun4i-emac.c +++ b/drivers/net/ethernet/allwinner/sun4i-emac.c @@ -18,6 +18,8 @@ #include <linux/gpio.h> #include <linux/interrupt.h> #include <linux/irq.h> +#include <linux/mfd/syscon.h> +#include <linux/mfd/syscon/sun4i-sc.h> #include <linux/mii.h> #include <linux/module.h> #include <linux/netdevice.h> @@ -28,6 +30,7 @@ #include <linux/of_platform.h> #include <linux/platform_device.h> #include <linux/phy.h> +#include <linux/regmap.h> #include "sun4i-emac.h" @@ -78,6 +81,7 @@ struct emac_board_info { struct phy_device *phy_dev; struct device_node *phy_node; + struct regmap *sc; unsigned int link; unsigned int speed; unsigned int duplex; @@ -862,6 +866,18 @@ static int emac_probe(struct platform_device *pdev) goto out; } + /* Map SRAM_A3_A4 to EMAC */ + db->sc = syscon_regmap_lookup_by_compatible( + "allwinner,sun4i-a10-syscon"); + if (IS_ERR(db->sc)) { + dev_err(&pdev->dev, "failed to find syscon regmap\n"); + ret = PTR_ERR(db->sc); + goto out; + } + + regmap_update_bits(db->sc, SUN4I_SC1, SUN4I_SC1_SRAM_A3_A4_MAP_MASK, + SUN4I_SC1_SRAM_A3_A4_MAP_EMAC); + /* Read MAC-address from DT */ mac_addr = of_get_mac_address(np); if (mac_addr) @@ -910,7 +926,9 @@ out: static int emac_remove(struct platform_device *pdev) { struct net_device *ndev = platform_get_drvdata(pdev); + struct emac_board_info *db = netdev_priv(ndev); + regmap_update_bits(db->sc, SUN4I_SC1, SUN4I_SC1_SRAM_A3_A4_MAP_MASK, 0); unregister_netdev(ndev); free_netdev(ndev); -- 2.2.2 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
