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 <jenskuske@xxxxxxxxx>
---
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
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