[PATCH v3 18/21] 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.

It has been tested on Cubieboard7.

Signed-off-by: Amit Singh Tomar <amittomer25@gmail.com>
---
Changes since v2:
        * Newly added patch, not there in v2/v1.
---
 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 a0bd737..b4ed719 100644
--- a/arch/arm/include/asm/arch-owl/regs_s700.h
+++ b/arch/arm/include/asm/arch-owl/regs_s700.h
@@ -53,4 +53,10 @@
 #define CMU_CVBSPLL		(0x00B8)
 #define CMU_SSTSCLK		(0x00C0)
 
+#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 01d087f..6a5ecf8 100644
--- a/drivers/net/Kconfig
+++ b/drivers/net/Kconfig
@@ -218,6 +218,13 @@ 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 3099183..b8e766b 100644
--- a/drivers/net/Makefile
+++ b/drivers/net/Makefile
@@ -17,6 +17,7 @@ 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 0000000..a5d544e
--- /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