net: designware: socfpga: Add Arria10 extras

Add wrapper around the designware MAC driver to handle the SoCFPGA
specific configuration bits. On Arria10, this is configuration of
syscon phy_intf.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Chin Liang See <chin.liang.see@intel.com>
Cc: Dinh Nguyen <dinguyen@kernel.org>
Cc: Ley Foon Tan <ley.foon.tan@intel.com>
Cc: Joe Hershberger <joe.hershberger@ni.com>

3 files changed, 152 insertions, 0 deletions

diff --git a/drivers/net/Kconfig b/drivers/net/Kconfig
index f762b0898d..d86da7760e 100644
--- a/drivers/net/Kconfig
+++ b/drivers/net/Kconfig
@@ -150,6 +150,14 @@ config ETH_DESIGNWARE
 	  100Mbit and 1 Gbit operation. You must enable CONFIG_PHYLIB to
 	  provide the PHY (physical media interface).
 
+config ETH_DESIGNWARE_SOCFPGA
+	bool "Altera SoCFPGA extras for Synopsys Designware Ethernet MAC"
+	depends on DM_ETH && ETH_DESIGNWARE
+	help
+	  The Altera SoCFPGA requires additional configuration of the
+	  Altera system manager to correctly interface with the PHY.
+	  This code handles those SoC specifics.
+
 config ETHOC
 	bool "OpenCores 10/100 Mbps Ethernet MAC"
 	help
diff --git a/drivers/net/Makefile b/drivers/net/Makefile
index c1ed44e21f..48a2878071 100644
--- a/drivers/net/Makefile
+++ b/drivers/net/Makefile
@@ -14,6 +14,7 @@ obj-$(CONFIG_CALXEDA_XGMAC) += calxedaxgmac.o
 obj-$(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_DRIVER_DM9000) += dm9000x.o
 obj-$(CONFIG_DNET) += dnet.o
 obj-$(CONFIG_E1000) += e1000.o
diff --git a/drivers/net/dwmac_socfpga.c b/drivers/net/dwmac_socfpga.c
new file mode 100644
index 0000000000..08fc9677c4
--- /dev/null
+++ b/drivers/net/dwmac_socfpga.c
@@ -0,0 +1,143 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2018 Marek Vasut <marex@denx.de>
+ *
+ * Altera SoCFPGA EMAC extras
+ */
+
+#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/system_manager.h>
+
+enum dwmac_type {
+	DWMAC_SOCFPGA_GEN5 = 0,
+	DWMAC_SOCFPGA_ARRIA10,
+	DWMAC_SOCFPGA_STRATIX10,
+};
+
+struct dwmac_socfpga_platdata {
+	struct dw_eth_pdata	dw_eth_pdata;
+	enum dwmac_type		type;
+	void			*phy_intf;
+};
+
+static int dwmac_socfpga_ofdata_to_platdata(struct udevice *dev)
+{
+	struct dwmac_socfpga_platdata *pdata = dev_get_platdata(dev);
+	struct regmap *regmap;
+	struct ofnode_phandle_args args;
+	void *range;
+	int ret;
+
+	ret = dev_read_phandle_with_args(dev, "altr,sysmgr-syscon", NULL,
+					 2, 0, &args);
+	if (ret) {
+		dev_err(dev, "Failed to get syscon: %d\n", ret);
+		return ret;
+	}
+
+	if (args.args_count != 2) {
+		dev_err(dev, "Invalid number of syscon args\n");
+		return -EINVAL;
+	}
+
+	regmap = syscon_node_to_regmap(args.node);
+	if (IS_ERR(regmap)) {
+		ret = PTR_ERR(regmap);
+		dev_err(dev, "Failed to get regmap: %d\n", ret);
+		return ret;
+	}
+
+	range = regmap_get_range(regmap, 0);
+	if (!range) {
+		dev_err(dev, "Failed to get regmap range\n");
+		return -ENOMEM;
+	}
+
+	pdata->phy_intf = range + args.args[0];
+
+	/*
+	 * Sadly, the Altera DT bindings don't have SoC-specific compatibles,
+	 * so we have to guesstimate which SoC we are running on from the
+	 * DWMAC version. Luckily, Altera at least updated the DWMAC with
+	 * each SoC.
+	 */
+	if (ofnode_device_is_compatible(dev->node, "snps,dwmac-3.70a"))
+		pdata->type = DWMAC_SOCFPGA_GEN5;
+
+	if (ofnode_device_is_compatible(dev->node, "snps,dwmac-3.72a"))
+		pdata->type = DWMAC_SOCFPGA_ARRIA10;
+
+	if (ofnode_device_is_compatible(dev->node, "snps,dwmac-3.74a"))
+		pdata->type = DWMAC_SOCFPGA_STRATIX10;
+
+	return designware_eth_ofdata_to_platdata(dev);
+}
+
+static int dwmac_socfpga_probe(struct udevice *dev)
+{
+	struct dwmac_socfpga_platdata *pdata = dev_get_platdata(dev);
+	struct eth_pdata *edata = &pdata->dw_eth_pdata.eth_pdata;
+	struct reset_ctl_bulk reset_bulk;
+	int ret;
+	u8 modereg;
+
+	if (pdata->type == DWMAC_SOCFPGA_ARRIA10) {
+		switch (edata->phy_interface) {
+		case PHY_INTERFACE_MODE_MII:
+		case PHY_INTERFACE_MODE_GMII:
+			modereg = SYSMGR_EMACGRP_CTRL_PHYSEL_ENUM_GMII_MII;
+			break;
+		case PHY_INTERFACE_MODE_RMII:
+			modereg = SYSMGR_EMACGRP_CTRL_PHYSEL_ENUM_RMII;
+			break;
+		case PHY_INTERFACE_MODE_RGMII:
+			modereg = SYSMGR_EMACGRP_CTRL_PHYSEL_ENUM_RGMII;
+			break;
+		default:
+			dev_err(dev, "Unsupported PHY mode\n");
+			return -EINVAL;
+		}
+
+		ret = reset_get_bulk(dev, &reset_bulk);
+		if (ret) {
+			dev_err(dev, "Failed to get reset: %d\n", ret);
+			return ret;
+		}
+
+		reset_assert_bulk(&reset_bulk);
+
+		clrsetbits_le32(pdata->phy_intf,
+				SYSMGR_EMACGRP_CTRL_PHYSEL_MASK,
+				modereg);
+
+		reset_release_bulk(&reset_bulk);
+	}
+
+	return designware_eth_probe(dev);
+}
+
+static const struct udevice_id dwmac_socfpga_ids[] = {
+	{ .compatible = "altr,socfpga-stmmac" },
+	{ }
+};
+
+U_BOOT_DRIVER(dwmac_socfpga) = {
+	.name		= "dwmac_socfpga",
+	.id		= UCLASS_ETH,
+	.of_match	= dwmac_socfpga_ids,
+	.ofdata_to_platdata = dwmac_socfpga_ofdata_to_platdata,
+	.probe		= dwmac_socfpga_probe,
+	.ops		= &designware_eth_ops,
+	.priv_auto_alloc_size = sizeof(struct dw_eth_dev),
+	.platdata_auto_alloc_size = sizeof(struct dwmac_socfpga_platdata),
+	.flags		= DM_FLAG_ALLOC_PRIV_DMA,
+};