net: eqos: Rockchip support

A variant of the designware eqos core is used on Rockchip SoCs. Add
support for it.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Link: https://lore.barebox.org/20210608093635.5749-5-s.hauer@pengutronix.de
Link: https://lore.barebox.org/20210609085512.3865-1-a.fatoum@pengutronix.de
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

3 files changed, 324 insertions, 0 deletions

diff --git a/drivers/net/Kconfig b/drivers/net/Kconfig
index 0d55ea7a3b..18931211b5 100644
--- a/drivers/net/Kconfig
+++ b/drivers/net/Kconfig
@@ -108,6 +108,12 @@ config DRIVER_NET_DESIGNWARE_TEGRA186
 	help
 	  This option enables support for the ethernet MAC on the Tegra186 & 194.
 
+config DRIVER_NET_DESIGNWARE_ROCKCHIP
+	bool "Designware Universal MAC ethernet driver for Rockchip platforms"
+	select MFD_SYSCON
+	help
+	  This option enables support for the ethernet MAC on different Rockchip SoCs
+
 endif
 
 config DRIVER_NET_DM9K
diff --git a/drivers/net/Makefile b/drivers/net/Makefile
index 656d45a868..1674d53dff 100644
--- a/drivers/net/Makefile
+++ b/drivers/net/Makefile
@@ -14,6 +14,7 @@ obj-$(CONFIG_DRIVER_NET_DESIGNWARE_SOCFPGA) += designware_socfpga.o
 obj-$(CONFIG_DRIVER_NET_DESIGNWARE_EQOS) += designware_eqos.o
 obj-$(CONFIG_DRIVER_NET_DESIGNWARE_STM32) += designware_stm32.o
 obj-$(CONFIG_DRIVER_NET_DESIGNWARE_TEGRA186) += designware_tegra186.o
+obj-$(CONFIG_DRIVER_NET_DESIGNWARE_ROCKCHIP) += designware_rockchip.o
 obj-$(CONFIG_DRIVER_NET_DM9K)		+= dm9k.o
 obj-$(CONFIG_DRIVER_NET_E1000)		+= e1000/regio.o e1000/main.o e1000/eeprom.o
 obj-$(CONFIG_DRIVER_NET_ENC28J60)	+= enc28j60.o
diff --git a/drivers/net/designware_rockchip.c b/drivers/net/designware_rockchip.c
new file mode 100644
index 0000000000..e4f74f646f
--- /dev/null
+++ b/drivers/net/designware_rockchip.c
@@ -0,0 +1,317 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <common.h>
+#include <init.h>
+#include <dma.h>
+#include <net.h>
+#include <regmap.h>
+#include <of_net.h>
+#include <mfd/syscon.h>
+#include <linux/iopoll.h>
+#include <linux/sizes.h>
+#include <linux/time.h>
+#include <linux/clk.h>
+
+#include "designware_eqos.h"
+
+struct rk_gmac_ops {
+	void (*set_to_rgmii)(struct eqos *eqos,
+			     int tx_delay, int rx_delay);
+	void (*set_to_rmii)(struct eqos *eqos);
+	void (*set_rmii_speed)(struct eqos *eqos, int speed);
+	void (*set_rgmii_speed)(struct eqos *eqos, int speed);
+	void (*integrated_phy_powerup)(struct eqos *eqos);
+};
+
+struct eqos_rk_gmac {
+	struct clk_bulk_data *clks;
+	int num_clks;
+	bool clock_input;
+	const struct rk_gmac_ops *ops;
+	struct regmap *grf;
+	int bus_id;
+	u32 tx_delay;
+	u32 rx_delay;
+	struct device_d *dev;
+};
+
+enum {
+	CLK_STMMACETH,
+	CLK_MAC_RX,
+	CLK_MAC_TX,
+	CLK_MAC_REFOUT,
+	CLK_MAC_ACLK,
+	CLK_MAC_PCLK,
+	CLK_MAC_SPEED,
+	CLK_PTP_REF,
+	CLK_XPCS_PCLK,
+};
+
+static const struct clk_bulk_data rk_gmac_clks[] = {
+	[CLK_STMMACETH]   = { .id = "stmmaceth" },
+	[CLK_MAC_RX]      = { .id = "mac_clk_rx" },
+	[CLK_MAC_TX]      = { .id = "mac_clk_tx" },
+	[CLK_MAC_REFOUT]  = { .id = "clk_mac_refout" },
+	[CLK_MAC_ACLK]    = { .id = "aclk_mac" },
+	[CLK_MAC_PCLK]    = { .id = "pclk_mac" },
+	[CLK_MAC_SPEED]   = { .id = "clk_mac_speed" },
+	[CLK_PTP_REF]     = { .id = "ptp_ref" },
+	[CLK_XPCS_PCLK]   = { .id = "pclk_xpcs" },
+};
+
+static inline struct eqos_rk_gmac *to_rk_gmac(struct eqos *eqos)
+{
+	return eqos->priv;
+}
+
+#define HIWORD_UPDATE(val, mask, shift) \
+		((val) << (shift) | (mask) << ((shift) + 16))
+
+#define GRF_BIT(nr)	(BIT(nr) | BIT((nr) + 16))
+#define GRF_CLR_BIT(nr)	(BIT((nr) + 16))
+
+#define RK3568_GRF_GMAC0_CON0		0x0380
+#define RK3568_GRF_GMAC0_CON1		0x0384
+#define RK3568_GRF_GMAC1_CON0		0x0388
+#define RK3568_GRF_GMAC1_CON1		0x038c
+
+/* RK3568_GRF_GMAC0_CON1 && RK3568_GRF_GMAC1_CON1 */
+#define RK3568_GMAC_PHY_INTF_SEL_RGMII	\
+		(GRF_BIT(4) | GRF_CLR_BIT(5) | GRF_CLR_BIT(6))
+#define RK3568_GMAC_PHY_INTF_SEL_RMII	\
+		(GRF_CLR_BIT(4) | GRF_CLR_BIT(5) | GRF_BIT(6))
+#define RK3568_GMAC_FLOW_CTRL			GRF_BIT(3)
+#define RK3568_GMAC_FLOW_CTRL_CLR		GRF_CLR_BIT(3)
+#define RK3568_GMAC_RXCLK_DLY_ENABLE		GRF_BIT(1)
+#define RK3568_GMAC_RXCLK_DLY_DISABLE		GRF_CLR_BIT(1)
+#define RK3568_GMAC_TXCLK_DLY_ENABLE		GRF_BIT(0)
+#define RK3568_GMAC_TXCLK_DLY_DISABLE		GRF_CLR_BIT(0)
+
+/* RK3568_GRF_GMAC0_CON0 && RK3568_GRF_GMAC1_CON0 */
+#define RK3568_GMAC_CLK_RX_DL_CFG(val)	HIWORD_UPDATE(val, 0x7F, 8)
+#define RK3568_GMAC_CLK_TX_DL_CFG(val)	HIWORD_UPDATE(val, 0x7F, 0)
+
+static unsigned long eqos_get_csr_clk_rate_rk_gmac(struct eqos *eqos)
+{
+	struct eqos_rk_gmac *priv = to_rk_gmac(eqos);
+
+	return clk_get_rate(priv->clks[CLK_STMMACETH].clk);
+}
+
+static void rk3568_set_to_rgmii(struct eqos *eqos,
+				int tx_delay, int rx_delay)
+{
+	struct eqos_rk_gmac *priv = to_rk_gmac(eqos);
+	struct device_d *dev = priv->dev;
+	u32 offset_con0, offset_con1;
+
+	if (IS_ERR(priv->grf)) {
+		dev_err(dev, "Missing rockchip,grf property\n");
+		return;
+	}
+
+	offset_con0 = (priv->bus_id == 1)
+		      ? RK3568_GRF_GMAC1_CON0 : RK3568_GRF_GMAC0_CON0;
+	offset_con1 = (priv->bus_id == 1)
+		      ? RK3568_GRF_GMAC1_CON1 : RK3568_GRF_GMAC0_CON1;
+
+	regmap_write(priv->grf, offset_con1,
+		     RK3568_GMAC_PHY_INTF_SEL_RGMII |
+		     RK3568_GMAC_RXCLK_DLY_ENABLE |
+		     RK3568_GMAC_TXCLK_DLY_ENABLE);
+
+	regmap_write(priv->grf, offset_con0,
+		     RK3568_GMAC_CLK_RX_DL_CFG(rx_delay) |
+		     RK3568_GMAC_CLK_TX_DL_CFG(tx_delay));
+}
+
+static void rk3568_set_to_rmii(struct eqos *eqos)
+{
+	struct eqos_rk_gmac *priv = to_rk_gmac(eqos);
+	struct device_d *dev = priv->dev;
+	u32 offset_con1;
+
+	if (IS_ERR(priv->grf)) {
+		dev_err(dev, "%s: Missing rockchip,grf property\n", __func__);
+		return;
+	}
+
+	offset_con1 = (priv->bus_id == 1)
+		      ? RK3568_GRF_GMAC1_CON1 : RK3568_GRF_GMAC0_CON1;
+
+	regmap_write(priv->grf, offset_con1,
+		     RK3568_GMAC_PHY_INTF_SEL_RMII);
+}
+
+static void rk3568_set_gmac_speed(struct eqos *eqos, int speed)
+{
+	struct eqos_rk_gmac *priv = to_rk_gmac(eqos);
+	struct device_d *dev = priv->dev;
+	unsigned long rate;
+	int ret;
+
+	switch (speed) {
+	case SPEED_10:
+		rate = 2500000;
+		break;
+	case SPEED_100:
+		rate = 25000000;
+		break;
+	case SPEED_1000:
+		rate = 125000000;
+		break;
+	default:
+		dev_err(dev, "unknown speed value for GMAC speed=%d", speed);
+		return;
+	}
+
+	ret = clk_set_rate(priv->clks[CLK_MAC_SPEED].clk, rate);
+	if (ret)
+		dev_err(dev, "%s: set clk_mac_speed rate %ld failed %d\n",
+			__func__, rate, ret);
+}
+
+static const struct rk_gmac_ops rk3568_ops = {
+	.set_to_rgmii = rk3568_set_to_rgmii,
+	.set_to_rmii = rk3568_set_to_rmii,
+	.set_rmii_speed = rk3568_set_gmac_speed,
+	.set_rgmii_speed = rk3568_set_gmac_speed,
+};
+
+static int rk_gmac_powerup(struct eqos *eqos)
+{
+	struct eqos_rk_gmac *priv = to_rk_gmac(eqos);
+	struct device_d *dev = priv->dev;
+
+	/*rmii or rgmii*/
+	switch (eqos->interface) {
+	case PHY_INTERFACE_MODE_RGMII:
+		dev_dbg(dev, "init for RGMII\n");
+		priv->ops->set_to_rgmii(eqos, priv->tx_delay,
+					    priv->rx_delay);
+		break;
+	case PHY_INTERFACE_MODE_RGMII_ID:
+		dev_dbg(dev, "init for RGMII_ID\n");
+		priv->ops->set_to_rgmii(eqos, 0, 0);
+		break;
+	case PHY_INTERFACE_MODE_RGMII_RXID:
+		dev_dbg(dev, "init for RGMII_RXID\n");
+		priv->ops->set_to_rgmii(eqos, priv->tx_delay, 0);
+		break;
+	case PHY_INTERFACE_MODE_RGMII_TXID:
+		dev_dbg(dev, "init for RGMII_TXID\n");
+		priv->ops->set_to_rgmii(eqos, 0, priv->rx_delay);
+		break;
+	case PHY_INTERFACE_MODE_RMII:
+		dev_dbg(dev, "init for RMII\n");
+		priv->ops->set_to_rmii(eqos);
+		break;
+	default:
+		dev_err(dev, "NO interface defined!\n");
+	}
+
+	return 0;
+}
+
+static void eqos_rk_adjust_link(struct eth_device *edev)
+{
+	struct eqos *eqos = edev->priv;
+	struct eqos_rk_gmac *priv = to_rk_gmac(eqos);
+
+	if (phy_interface_mode_is_rgmii(eqos->interface))
+		priv->ops->set_rgmii_speed(eqos, edev->phydev->speed);
+	else
+		priv->ops->set_rmii_speed(eqos, edev->phydev->speed);
+
+	eqos_adjust_link(edev);
+}
+
+static int eqos_init_rk_gmac(struct device_d *dev, struct eqos *eqos)
+{
+	struct device_node *np = dev->device_node;
+	struct eqos_rk_gmac *priv = to_rk_gmac(eqos);
+	int ret;
+	const char *strings;
+
+	priv->dev = dev;
+
+	ret = of_property_read_string(np, "clock_in_out", &strings);
+	if (ret) {
+                dev_err(dev, "Can not read property: clock_in_out.\n");
+                priv->clock_input = true;
+	} else {
+		dev_dbg(dev, "clock is %s\n", strings);
+		if (!strcmp(strings, "input"))
+			priv->clock_input = true;
+		else
+			priv->clock_input = false;
+	}
+
+	priv->ops = device_get_match_data(dev);
+
+	priv->bus_id = of_alias_get_id(np, "ethernet");
+
+	priv->grf = syscon_regmap_lookup_by_phandle(np, "rockchip,grf");
+	if (IS_ERR(priv->grf)) {
+		dev_err(dev, "unable to get grf");
+		return PTR_ERR(priv->grf);
+	}
+
+	priv->tx_delay = 0x30;
+	of_property_read_u32(np, "tx_delay", &priv->tx_delay);
+	priv->rx_delay = 0x10;
+	of_property_read_u32(np, "rx_delay", &priv->rx_delay);
+
+	priv->num_clks = ARRAY_SIZE(rk_gmac_clks);
+	priv->clks = xmalloc(priv->num_clks * sizeof(*priv->clks));
+	memcpy(priv->clks, rk_gmac_clks, sizeof rk_gmac_clks);
+
+	ret = clk_bulk_get(dev, priv->num_clks, priv->clks);
+	if (ret) {
+		dev_err(dev, "Failed to get clks: %s\n", strerror(-ret));
+		return ret;
+	}
+
+	ret = clk_bulk_enable(priv->num_clks, priv->clks);
+	if (ret) {
+		dev_err(dev, "Failed to enable clks: %s\n", strerror(-ret));
+		return ret;
+	}
+
+	rk_gmac_powerup(eqos);
+
+	return 0;
+}
+
+static struct eqos_ops rk_gmac_ops = {
+	.init = eqos_init_rk_gmac,
+	.get_ethaddr = eqos_get_ethaddr,
+	.set_ethaddr = eqos_set_ethaddr,
+	.adjust_link = eqos_rk_adjust_link,
+	.get_csr_clk_rate = eqos_get_csr_clk_rate_rk_gmac,
+
+	.clk_csr = EQOS_MDIO_ADDR_CR_250_300,
+	.config_mac = EQOS_MAC_RXQ_CTRL0_RXQ0EN_ENABLED_AV,
+};
+
+static int rk_gmac_probe(struct device_d *dev)
+{
+	return eqos_probe(dev, &rk_gmac_ops, xzalloc(sizeof(struct eqos_rk_gmac)));
+}
+
+static __maybe_unused struct of_device_id rk_gmac_compatible[] = {
+	{
+		.compatible = "rockchip,rk3568-gmac",
+		.data = &rk3568_ops,
+	}, {
+		/* sentinel */
+	}
+};
+
+static struct driver_d rk_gmac_driver = {
+	.name = "eqos-rockchip",
+	.probe = rk_gmac_probe,
+	.remove = eqos_remove,
+	.of_compatible = DRV_OF_COMPAT(rk_gmac_compatible),
+};
+device_platform_driver(rk_gmac_driver);