[PATCH v1 4/7] net: designware: s700: Add glue code for S700 mac

[Amit Singh Tomar <amittomer25@gmail.com>]

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>
---
 arch/arm/include/asm/arch-owl/regs_s700.h |  6 +++
 drivers/net/Kconfig                       |  7 ++++
 drivers/net/Makefile                      |  1 +
 drivers/net/dwmac_s700.c                  | 66 +++++++++++++++++++++++++++++++
 4 files changed, 80 insertions(+)
 create mode 100644 drivers/net/dwmac_s700.c

diff --git a/arch/arm/include/asm/arch-owl/regs_s700.h b/arch/arm/include/asm/arch-owl/regs_s700.h
index 90459ae95eeb..0f79faec69c1 100644
--- a/arch/arm/include/asm/arch-owl/regs_s700.h
+++ b/arch/arm/include/asm/arch-owl/regs_s700.h
@@ -55,4 +55,10 @@
 
 #define CMU_DEVCLKEN1_ETH	BIT(23)
 
+#define GPIO_MFP_PWM           (0xE01B0000)
+#define MFP_CTL0               (GPIO_MFP_PWM + 0x40)
+#define MFP_CTL1               (GPIO_MFP_PWM + 0x44)
+#define MFP_CTL2               (GPIO_MFP_PWM + 0x48)
+#define MFP_CTL3               (GPIO_MFP_PWM + 0x4C)
+
 #endif
diff --git a/drivers/net/Kconfig b/drivers/net/Kconfig
index a2587a29e165..1a04e333efdf 100644
--- a/drivers/net/Kconfig
+++ b/drivers/net/Kconfig
@@ -225,6 +225,13 @@ 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 6d9b8772b1a5..6f01d0169240 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_E1000) += e1000.o
diff --git a/drivers/net/dwmac_s700.c b/drivers/net/dwmac_s700.c
new file mode 100644
index 000000000000..a5d544e91e06
--- /dev/null
+++ b/drivers/net/dwmac_s700.c
@@ -0,0 +1,66 @@
+// 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>
+
+/* 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,
+};
-- 
2.7.4