net: designware: s700: Add glue code for S700 mac

This patchs adds glue logic to enable designware mac present on
Action Semi based S700 SoC, Configures SoC specific bits.

Undocumented bit that programs the PHY interface select register
comes from vendor source.

It has been tested on Cubieboard7-lite based on S700 SoC.

Signed-off-by: Amit Singh Tomar <amittomer25@gmail.com>

3 files changed, 75 insertions, 0 deletions

diff --git a/drivers/net/Kconfig b/drivers/net/Kconfig
index 1566b3b..ec3fb49 100644
--- a/drivers/net/Kconfig
+++ b/drivers/net/Kconfig
@@ -238,6 +238,13 @@ config ETH_DESIGNWARE_SOCFPGA
 	  Altera system manager to correctly interface with the PHY.
 	  This code handles those SoC specifics.
 
+config ETH_DESIGNWARE_S700
+	bool "Actins S700 glue driver for Synopsys Designware Ethernet MAC"
+	depends on DM_ETH && ETH_DESIGNWARE
+	help
+	  This provides glue layer to use Synopsys Designware Ethernet MAC
+	  present on Actions S700 SoC.
+
 config ETHOC
 	bool "OpenCores 10/100 Mbps Ethernet MAC"
 	help
diff --git a/drivers/net/Makefile b/drivers/net/Makefile
index 383ed1c..1ecdc40 100644
--- a/drivers/net/Makefile
+++ b/drivers/net/Makefile
@@ -18,6 +18,7 @@ obj-$(CONFIG_CS8900) += cs8900.o
 obj-$(CONFIG_TULIP) += dc2114x.o
 obj-$(CONFIG_ETH_DESIGNWARE) += designware.o
 obj-$(CONFIG_ETH_DESIGNWARE_SOCFPGA) += dwmac_socfpga.o
+obj-$(CONFIG_ETH_DESIGNWARE_S700) += dwmac_s700.o
 obj-$(CONFIG_DRIVER_DM9000) += dm9000x.o
 obj-$(CONFIG_DNET) += dnet.o
 obj-$(CONFIG_DM_ETH_PHY) += eth-phy-uclass.o
diff --git a/drivers/net/dwmac_s700.c b/drivers/net/dwmac_s700.c
new file mode 100644
index 0000000..9d3f3ac
--- /dev/null
+++ b/drivers/net/dwmac_s700.c
@@ -0,0 +1,67 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2020 Amit Singh Tomar <amittomer25@gmail.com>
+ *
+ * Actions DWMAC specific glue layer
+ */
+
+#include <common.h>
+#include <asm/io.h>
+#include <dm.h>
+#include <clk.h>
+#include <phy.h>
+#include <regmap.h>
+#include <reset.h>
+#include <syscon.h>
+#include "designware.h"
+#include <asm/arch-owl/regs_s700.h>
+#include <linux/bitops.h>
+
+/* pin control for MAC */
+#define RMII_TXD01_MFP_CTL0		(0x0 << 16)
+#define RMII_RXD01_MFP_CTL0		(0x0 << 8)
+#define RMII_TXEN_TXER_MFP_CTL0		(0x0 << 13)
+#define RMII_REF_CLK_MFP_CTL0		(0x0 << 6)
+#define CLKO_25M_EN_MFP_CTL3		BIT(30)
+
+DECLARE_GLOBAL_DATA_PTR;
+
+static void dwmac_board_setup(void)
+{
+	clrbits_le32(MFP_CTL0, (RMII_TXD01_MFP_CTL0 | RMII_RXD01_MFP_CTL0 |
+		     RMII_TXEN_TXER_MFP_CTL0 | RMII_REF_CLK_MFP_CTL0));
+
+	setbits_le32(MFP_CTL3, CLKO_25M_EN_MFP_CTL3);
+}
+
+static int dwmac_s700_probe(struct udevice *dev)
+{
+	dwmac_board_setup();
+
+	/* This is undocumented, phy interface select register */
+	writel(0x4, 0xe024c0a0);
+
+	return designware_eth_probe(dev);
+}
+
+static int dwmac_s700_ofdata_to_platdata(struct udevice *dev)
+{
+	return designware_eth_ofdata_to_platdata(dev);
+}
+
+static const struct udevice_id dwmac_s700_ids[] = {
+	{.compatible = "actions,s700-ethernet"},
+	{ }
+};
+
+U_BOOT_DRIVER(dwmac_s700) = {
+	.name   = "dwmac_s700",
+	.id     = UCLASS_ETH,
+	.of_match = dwmac_s700_ids,
+	.ofdata_to_platdata = dwmac_s700_ofdata_to_platdata,
+	.probe  = dwmac_s700_probe,
+	.ops    = &designware_eth_ops,
+	.priv_auto_alloc_size = sizeof(struct dw_eth_dev),
+	.platdata_auto_alloc_size = sizeof(struct eth_pdata),
+	.flags = DM_FLAG_ALLOC_PRIV_DMA,
+};