net: gmac_rockchip: Add Rockchip GMAC driver

Add a new driver for the GMAC ethernet interface present in Rockchip
RK3288 SOCs. This driver subclasses the generic design-ware driver to
add the glue needed specifically for Rockchip.

Signed-off-by: Sjoerd Simons <sjoerd.simons@collabora.co.uk>
Signed-off-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Romain Perier <romain.perier@collabora.com>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>

drivers/net/Kconfig

@@ -215,4 +215,11 @@ config PIC32_ETH
 	  This driver implements 10/100 Mbps Ethernet and MAC layer for
 	  Microchip PIC32 microcontrollers.
 
+config GMAC_ROCKCHIP
+	bool "Rockchip Synopsys Designware Ethernet MAC"
+	depends on DM_ETH && ETH_DESIGNWARE
+	help
+	  This driver provides Rockchip SoCs network support based on the
+	  Synopsys Designware driver.
+
 endif # NETDEVICES

drivers/net/Makefile

@@ -34,6 +34,7 @@ obj-$(CONFIG_FTGMAC100) += ftgmac100.o
 obj-$(CONFIG_FTMAC110) += ftmac110.o
 obj-$(CONFIG_FTMAC100) += ftmac100.o
 obj-$(CONFIG_GRETH) += greth.o
+obj-$(CONFIG_GMAC_ROCKCHIP) += gmac_rockchip.o
 obj-$(CONFIG_DRIVER_TI_KEYSTONE_NET) += keystone_net.o
 obj-$(CONFIG_KS8851_MLL) += ks8851_mll.o
 obj-$(CONFIG_LAN91C96) += lan91c96.o

drivers/net/gmac_rockchip.c

@@ -0,0 +1,154 @@
+/*
+ * (C) Copyright 2015 Sjoerd Simons <sjoerd.simons@collabora.co.uk>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ *
+ * Rockchip GMAC ethernet IP driver for U-Boot
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <clk.h>
+#include <phy.h>
+#include <syscon.h>
+#include <asm/io.h>
+#include <asm/arch/periph.h>
+#include <asm/arch/clock.h>
+#include <asm/arch/grf_rk3288.h>
+#include <dm/pinctrl.h>
+#include <dt-bindings/clock/rk3288-cru.h>
+#include "designware.h"
+
+DECLARE_GLOBAL_DATA_PTR;
+
+/*
+ * Platform data for the gmac
+ *
+ * dw_eth_pdata: Required platform data for designware driver (must be first)
+ */
+struct gmac_rockchip_platdata {
+	struct dw_eth_pdata dw_eth_pdata;
+	int tx_delay;
+	int rx_delay;
+};
+
+static int gmac_rockchip_ofdata_to_platdata(struct udevice *dev)
+{
+	struct gmac_rockchip_platdata *pdata = dev_get_platdata(dev);
+
+	pdata->tx_delay = fdtdec_get_int(gd->fdt_blob, dev->of_offset,
+					 "tx-delay", 0x30);
+	pdata->rx_delay = fdtdec_get_int(gd->fdt_blob, dev->of_offset,
+					 "rx-delay", 0x10);
+
+	return designware_eth_ofdata_to_platdata(dev);
+}
+
+static int gmac_rockchip_fix_mac_speed(struct dw_eth_dev *priv)
+{
+	struct rk3288_grf *grf;
+	int clk;
+
+	switch (priv->phydev->speed) {
+	case 10:
+		clk = GMAC_CLK_SEL_2_5M;
+		break;
+	case 100:
+		clk = GMAC_CLK_SEL_25M;
+		break;
+	case 1000:
+		clk = GMAC_CLK_SEL_125M;
+		break;
+	default:
+		debug("Unknown phy speed: %d\n", priv->phydev->speed);
+		return -EINVAL;
+	}
+
+	grf = syscon_get_first_range(ROCKCHIP_SYSCON_GRF);
+	rk_clrsetreg(&grf->soc_con1,
+		     GMAC_CLK_SEL_MASK << GMAC_CLK_SEL_SHIFT,
+		     clk << GMAC_CLK_SEL_SHIFT);
+
+	return 0;
+}
+
+static int gmac_rockchip_probe(struct udevice *dev)
+{
+	struct gmac_rockchip_platdata *pdata = dev_get_platdata(dev);
+	struct rk3288_grf *grf;
+	struct clk clk;
+	int ret;
+
+	ret = clk_get_by_index(dev, 0, &clk);
+	if (ret)
+		return ret;
+
+	/* Since mac_clk is fed by an external clock we can use 0 here */
+	ret = clk_set_rate(&clk, 0);
+	if (ret)
+		return ret;
+
+	/* Set to RGMII mode */
+	grf = syscon_get_first_range(ROCKCHIP_SYSCON_GRF);
+	rk_clrsetreg(&grf->soc_con1,
+		     RMII_MODE_MASK << RMII_MODE_SHIFT |
+		     GMAC_PHY_INTF_SEL_MASK << GMAC_PHY_INTF_SEL_SHIFT,
+		     GMAC_PHY_INTF_SEL_RGMII << GMAC_PHY_INTF_SEL_SHIFT);
+
+	rk_clrsetreg(&grf->soc_con3,
+		     RXCLK_DLY_ENA_GMAC_MASK <<  RXCLK_DLY_ENA_GMAC_SHIFT |
+		     TXCLK_DLY_ENA_GMAC_MASK <<  TXCLK_DLY_ENA_GMAC_SHIFT |
+		     CLK_RX_DL_CFG_GMAC_MASK <<  CLK_RX_DL_CFG_GMAC_SHIFT |
+		     CLK_TX_DL_CFG_GMAC_MASK <<  CLK_TX_DL_CFG_GMAC_SHIFT,
+		     RXCLK_DLY_ENA_GMAC_ENABLE << RXCLK_DLY_ENA_GMAC_SHIFT |
+		     TXCLK_DLY_ENA_GMAC_ENABLE << TXCLK_DLY_ENA_GMAC_SHIFT |
+		     pdata->rx_delay << CLK_RX_DL_CFG_GMAC_SHIFT |
+		     pdata->tx_delay << CLK_TX_DL_CFG_GMAC_SHIFT);
+
+	return designware_eth_probe(dev);
+}
+
+static int gmac_rockchip_eth_start(struct udevice *dev)
+{
+	struct eth_pdata *pdata = dev_get_platdata(dev);
+	struct dw_eth_dev *priv = dev_get_priv(dev);
+	int ret;
+
+	ret = designware_eth_init(priv, pdata->enetaddr);
+	if (ret)
+		return ret;
+	ret = gmac_rockchip_fix_mac_speed(priv);
+	if (ret)
+		return ret;
+	ret = designware_eth_enable(priv);
+	if (ret)
+		return ret;
+
+	return 0;
+}
+
+const struct eth_ops gmac_rockchip_eth_ops = {
+	.start			= gmac_rockchip_eth_start,
+	.send			= designware_eth_send,
+	.recv			= designware_eth_recv,
+	.free_pkt		= designware_eth_free_pkt,
+	.stop			= designware_eth_stop,
+	.write_hwaddr		= designware_eth_write_hwaddr,
+};
+
+static const struct udevice_id rockchip_gmac_ids[] = {
+	{ .compatible = "rockchip,rk3288-gmac" },
+	{ }
+};
+
+U_BOOT_DRIVER(eth_gmac_rockchip) = {
+	.name	= "gmac_rockchip",
+	.id	= UCLASS_ETH,
+	.of_match = rockchip_gmac_ids,
+	.ofdata_to_platdata = gmac_rockchip_ofdata_to_platdata,
+	.probe	= gmac_rockchip_probe,
+	.ops	= &gmac_rockchip_eth_ops,
+	.priv_auto_alloc_size = sizeof(struct dw_eth_dev),
+	.platdata_auto_alloc_size = sizeof(struct gmac_rockchip_platdata),
+	.flags = DM_FLAG_ALLOC_PRIV_DMA,
+};