GMAC: add driver for Rockchip RK3288 SoCs integrated GMAC

This driver is based on stmmac driver.

changes since v2:
- use tab instead of space for macros
- use HIWORD_UPDATE macro for GMAC_CLK_RX_DL_CFG and GMAC_CLK_TX_DL_CFG
- remove drive-strength setting in the driver and set it in the pinctrl settings
- use dev_err instead of pr_err
- remove clock names's macros, just use the real name of the clock
- use devm_clk_get() instead of clk_get()
- remove clk_set_parent(bsp_priv->clk_mac, bsp_priv->clk_mac_pll)
- remove gpio setting for LDO, just use regulator API
- remove phy reset using gpio in the glue layer, it has been handled in the stmmac driver
- remove handling phy interrupt (mii interrupt)

changes since v1:
- use BIT() to set register
- combine two remap_write() operations into one for the same register
- use macros for register value setting
- remove grf fail check in rk_gmac_setup() and save all the check in set_rgmii_speed()
- remove .tx_coe=1 in rk_gmac_data

Signed-off-by: Roger Chen <roger.chen@rock-chips.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

4 files changed, 462 insertions, 1 deletions

diff --git a/drivers/net/ethernet/stmicro/stmmac/Makefile b/drivers/net/ethernet/stmicro/stmmac/Makefile
index ac4d5629d905..73c2715a27f3 100644
--- a/drivers/net/ethernet/stmicro/stmmac/Makefile
+++ b/drivers/net/ethernet/stmicro/stmmac/Makefile
@@ -6,7 +6,7 @@ stmmac-objs:= stmmac_main.o stmmac_ethtool.o stmmac_mdio.o ring_mode.o	\
 
 obj-$(CONFIG_STMMAC_PLATFORM) += stmmac-platform.o
 stmmac-platform-objs:= stmmac_platform.o dwmac-meson.o dwmac-sunxi.o    \
-                       dwmac-sti.o dwmac-socfpga.o
+                       dwmac-sti.o dwmac-socfpga.o dwmac-rk.o
 
 obj-$(CONFIG_STMMAC_PCI) += stmmac-pci.o
 stmmac-pci-objs:= stmmac_pci.o
diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-rk.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-rk.c
new file mode 100644
index 000000000000..35f9b86bc9e5
--- /dev/null
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-rk.c
@@ -0,0 +1,459 @@
+/**
+ * dwmac-rk.c - Rockchip RK3288 DWMAC specific glue layer
+ *
+ * Copyright (C) 2014 Chen-Zhi (Roger Chen)
+ *
+ * Chen-Zhi (Roger Chen)  <roger.chen@rock-chips.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/stmmac.h>
+#include <linux/bitops.h>
+#include <linux/clk.h>
+#include <linux/phy.h>
+#include <linux/of_net.h>
+#include <linux/gpio.h>
+#include <linux/of_gpio.h>
+#include <linux/of_device.h>
+#include <linux/regulator/consumer.h>
+#include <linux/delay.h>
+#include <linux/mfd/syscon.h>
+#include <linux/regmap.h>
+
+struct rk_priv_data {
+        struct platform_device *pdev;
+        int phy_iface;
+        char regulator[32];
+
+        bool clk_enabled;
+        bool clock_input;
+
+        struct clk *clk_mac;
+        struct clk *clk_mac_pll;
+        struct clk *gmac_clkin;
+        struct clk *mac_clk_rx;
+        struct clk *mac_clk_tx;
+        struct clk *clk_mac_ref;
+        struct clk *clk_mac_refout;
+        struct clk *aclk_mac;
+        struct clk *pclk_mac;
+
+        int tx_delay;
+        int rx_delay;
+
+        struct regmap *grf;
+};
+
+#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 RK3288_GRF_SOC_CON1     0x0248
+#define RK3288_GRF_SOC_CON3     0x0250
+#define RK3288_GRF_GPIO3D_E     0x01ec
+#define RK3288_GRF_GPIO4A_E     0x01f0
+#define RK3288_GRF_GPIO4B_E     0x01f4
+
+/*RK3288_GRF_SOC_CON1*/
+#define GMAC_PHY_INTF_SEL_RGMII (GRF_BIT(6) | GRF_CLR_BIT(7) | GRF_CLR_BIT(8))
+#define GMAC_PHY_INTF_SEL_RMII  (GRF_CLR_BIT(6) | GRF_CLR_BIT(7) | GRF_BIT(8))
+#define GMAC_FLOW_CTRL          GRF_BIT(9)
+#define GMAC_FLOW_CTRL_CLR      GRF_CLR_BIT(9)
+#define GMAC_SPEED_10M          GRF_CLR_BIT(10)
+#define GMAC_SPEED_100M         GRF_BIT(10)
+#define GMAC_RMII_CLK_25M       GRF_BIT(11)
+#define GMAC_RMII_CLK_2_5M      GRF_CLR_BIT(11)
+#define GMAC_CLK_125M           (GRF_CLR_BIT(12) | GRF_CLR_BIT(13))
+#define GMAC_CLK_25M            (GRF_BIT(12) | GRF_BIT(13))
+#define GMAC_CLK_2_5M           (GRF_CLR_BIT(12) | GRF_BIT(13))
+#define GMAC_RMII_MODE          GRF_BIT(14)
+#define GMAC_RMII_MODE_CLR      GRF_CLR_BIT(14)
+
+/*RK3288_GRF_SOC_CON3*/
+#define GMAC_TXCLK_DLY_ENABLE   GRF_BIT(14)
+#define GMAC_TXCLK_DLY_DISABLE  GRF_CLR_BIT(14)
+#define GMAC_RXCLK_DLY_ENABLE   GRF_BIT(15)
+#define GMAC_RXCLK_DLY_DISABLE  GRF_CLR_BIT(15)
+#define GMAC_CLK_RX_DL_CFG(val) HIWORD_UPDATE(val, 0x7F, 7)
+#define GMAC_CLK_TX_DL_CFG(val) HIWORD_UPDATE(val, 0x7F, 0)
+
+static void set_to_rgmii(struct rk_priv_data *bsp_priv,
+                         int tx_delay, int rx_delay)
+{
+        struct device *dev = &bsp_priv->pdev->dev;
+
+        if (IS_ERR(bsp_priv->grf)) {
+                dev_err(dev, "%s: Missing rockchip,grf property\n", __func__);
+                return;
+        }
+
+        regmap_write(bsp_priv->grf, RK3288_GRF_SOC_CON1,
+                     GMAC_PHY_INTF_SEL_RGMII | GMAC_RMII_MODE_CLR);
+        regmap_write(bsp_priv->grf, RK3288_GRF_SOC_CON3,
+                     GMAC_RXCLK_DLY_ENABLE | GMAC_TXCLK_DLY_ENABLE |
+                     GMAC_CLK_RX_DL_CFG(rx_delay) |
+                     GMAC_CLK_TX_DL_CFG(tx_delay));
+}
+
+static void set_to_rmii(struct rk_priv_data *bsp_priv)
+{
+        struct device *dev = &bsp_priv->pdev->dev;
+
+        if (IS_ERR(bsp_priv->grf)) {
+                dev_err(dev, "%s: Missing rockchip,grf property\n", __func__);
+                return;
+        }
+
+        regmap_write(bsp_priv->grf, RK3288_GRF_SOC_CON1,
+                     GMAC_PHY_INTF_SEL_RMII | GMAC_RMII_MODE);
+}
+
+static void set_rgmii_speed(struct rk_priv_data *bsp_priv, int speed)
+{
+        struct device *dev = &bsp_priv->pdev->dev;
+
+        if (IS_ERR(bsp_priv->grf)) {
+                dev_err(dev, "%s: Missing rockchip,grf property\n", __func__);
+                return;
+        }
+
+        if (speed == 10)
+                regmap_write(bsp_priv->grf, RK3288_GRF_SOC_CON1, GMAC_CLK_2_5M);
+        else if (speed == 100)
+                regmap_write(bsp_priv->grf, RK3288_GRF_SOC_CON1, GMAC_CLK_25M);
+        else if (speed == 1000)
+                regmap_write(bsp_priv->grf, RK3288_GRF_SOC_CON1, GMAC_CLK_125M);
+        else
+                dev_err(dev, "unknown speed value for RGMII! speed=%d", speed);
+}
+
+static void set_rmii_speed(struct rk_priv_data *bsp_priv, int speed)
+{
+        struct device *dev = &bsp_priv->pdev->dev;
+
+        if (IS_ERR(bsp_priv->grf)) {
+                dev_err(dev, "%s: Missing rockchip,grf property\n", __func__);
+                return;
+        }
+
+        if (speed == 10) {
+                regmap_write(bsp_priv->grf, RK3288_GRF_SOC_CON1,
+                             GMAC_RMII_CLK_2_5M | GMAC_SPEED_10M);
+        } else if (speed == 100) {
+                regmap_write(bsp_priv->grf, RK3288_GRF_SOC_CON1,
+                             GMAC_RMII_CLK_25M | GMAC_SPEED_100M);
+        } else {
+                dev_err(dev, "unknown speed value for RMII! speed=%d", speed);
+        }
+}
+
+static int gmac_clk_init(struct rk_priv_data *bsp_priv)
+{
+        struct device *dev = &bsp_priv->pdev->dev;
+
+        bsp_priv->clk_enabled = false;
+
+        bsp_priv->mac_clk_rx = devm_clk_get(dev, "mac_clk_rx");
+        if (IS_ERR(bsp_priv->mac_clk_rx))
+                dev_err(dev, "%s: cannot get clock %s\n",
+                        __func__, "mac_clk_rx");
+
+        bsp_priv->mac_clk_tx = devm_clk_get(dev, "mac_clk_tx");
+        if (IS_ERR(bsp_priv->mac_clk_tx))
+                dev_err(dev, "%s: cannot get clock %s\n",
+                        __func__, "mac_clk_tx");
+
+        bsp_priv->aclk_mac = devm_clk_get(dev, "aclk_mac");
+        if (IS_ERR(bsp_priv->aclk_mac))
+                dev_err(dev, "%s: cannot get clock %s\n",
+                        __func__, "aclk_mac");
+
+        bsp_priv->pclk_mac = devm_clk_get(dev, "pclk_mac");
+        if (IS_ERR(bsp_priv->pclk_mac))
+                dev_err(dev, "%s: cannot get clock %s\n",
+                        __func__, "pclk_mac");
+
+        bsp_priv->clk_mac = devm_clk_get(dev, "stmmaceth");
+        if (IS_ERR(bsp_priv->clk_mac))
+                dev_err(dev, "%s: cannot get clock %s\n",
+                        __func__, "stmmaceth");
+
+        if (bsp_priv->phy_iface == PHY_INTERFACE_MODE_RMII) {
+                bsp_priv->clk_mac_ref = devm_clk_get(dev, "clk_mac_ref");
+                if (IS_ERR(bsp_priv->clk_mac_ref))
+                        dev_err(dev, "%s: cannot get clock %s\n",
+                                __func__, "clk_mac_ref");
+
+                if (!bsp_priv->clock_input) {
+                        bsp_priv->clk_mac_refout =
+                                devm_clk_get(dev, "clk_mac_refout");
+                        if (IS_ERR(bsp_priv->clk_mac_refout))
+                                dev_err(dev, "%s: cannot get clock %s\n",
+                                        __func__, "clk_mac_refout");
+                }
+        }
+
+        if (bsp_priv->clock_input) {
+                dev_info(dev, "%s: clock input from PHY\n", __func__);
+        } else {
+                if (bsp_priv->phy_iface == PHY_INTERFACE_MODE_RMII)
+                        clk_set_rate(bsp_priv->clk_mac_pll, 50000000);
+        }
+
+        return 0;
+}
+
+static int gmac_clk_enable(struct rk_priv_data *bsp_priv, bool enable)
+{
+        int phy_iface = phy_iface = bsp_priv->phy_iface;
+
+        if (enable) {
+                if (!bsp_priv->clk_enabled) {
+                        if (phy_iface == PHY_INTERFACE_MODE_RMII) {
+                                if (!IS_ERR(bsp_priv->mac_clk_rx))
+                                        clk_prepare_enable(
+                                                bsp_priv->mac_clk_rx);
+
+                                if (!IS_ERR(bsp_priv->clk_mac_ref))
+                                        clk_prepare_enable(
+                                                bsp_priv->clk_mac_ref);
+
+                                if (!IS_ERR(bsp_priv->clk_mac_refout))
+                                        clk_prepare_enable(
+                                                bsp_priv->clk_mac_refout);
+                        }
+
+                        if (!IS_ERR(bsp_priv->aclk_mac))
+                                clk_prepare_enable(bsp_priv->aclk_mac);
+
+                        if (!IS_ERR(bsp_priv->pclk_mac))
+                                clk_prepare_enable(bsp_priv->pclk_mac);
+
+                        if (!IS_ERR(bsp_priv->mac_clk_tx))
+                                clk_prepare_enable(bsp_priv->mac_clk_tx);
+
+                        /**
+                         * if (!IS_ERR(bsp_priv->clk_mac))
+                         *      clk_prepare_enable(bsp_priv->clk_mac);
+                         */
+                        mdelay(5);
+                        bsp_priv->clk_enabled = true;
+                }
+        } else {
+                if (bsp_priv->clk_enabled) {
+                        if (phy_iface == PHY_INTERFACE_MODE_RMII) {
+                                if (!IS_ERR(bsp_priv->mac_clk_rx))
+                                        clk_disable_unprepare(
+                                                bsp_priv->mac_clk_rx);
+
+                                if (!IS_ERR(bsp_priv->clk_mac_ref))
+                                        clk_disable_unprepare(
+                                                bsp_priv->clk_mac_ref);
+
+                                if (!IS_ERR(bsp_priv->clk_mac_refout))
+                                        clk_disable_unprepare(
+                                                bsp_priv->clk_mac_refout);
+                        }
+
+                        if (!IS_ERR(bsp_priv->aclk_mac))
+                                clk_disable_unprepare(bsp_priv->aclk_mac);
+
+                        if (!IS_ERR(bsp_priv->pclk_mac))
+                                clk_disable_unprepare(bsp_priv->pclk_mac);
+
+                        if (!IS_ERR(bsp_priv->mac_clk_tx))
+                                clk_disable_unprepare(bsp_priv->mac_clk_tx);
+                        /**
+                         * if (!IS_ERR(bsp_priv->clk_mac))
+                         *      clk_disable_unprepare(bsp_priv->clk_mac);
+                         */
+                        bsp_priv->clk_enabled = false;
+                }
+        }
+
+        return 0;
+}
+
+static int phy_power_on(struct rk_priv_data *bsp_priv, bool enable)
+{
+        struct regulator *ldo;
+        char *ldostr = bsp_priv->regulator;
+        int ret;
+        struct device *dev = &bsp_priv->pdev->dev;
+
+        if (!ldostr) {
+                dev_err(dev, "%s: no ldo found\n", __func__);
+                return -1;
+        }
+
+        ldo = regulator_get(NULL, ldostr);
+        if (!ldo) {
+                dev_err(dev, "\n%s get ldo %s failed\n", __func__, ldostr);
+        } else {
+                if (enable) {
+                        if (!regulator_is_enabled(ldo)) {
+                                regulator_set_voltage(ldo, 3300000, 3300000);
+                                ret = regulator_enable(ldo);
+                                if (ret != 0)
+                                        dev_err(dev, "%s: fail to enable %s\n",
+                                                __func__, ldostr);
+                                else
+                                        dev_info(dev, "turn on ldo done.\n");
+                        } else {
+                                dev_warn(dev, "%s is enabled before enable",
+                                         ldostr);
+                        }
+                } else {
+                        if (regulator_is_enabled(ldo)) {
+                                ret = regulator_disable(ldo);
+                                if (ret != 0)
+                                        dev_err(dev, "%s: fail to disable %s\n",
+                                                __func__, ldostr);
+                                else
+                                        dev_info(dev, "turn off ldo done.\n");
+                        } else {
+                                dev_warn(dev, "%s is disabled before disable",
+                                         ldostr);
+                        }
+                }
+                regulator_put(ldo);
+        }
+
+        return 0;
+}
+
+static void *rk_gmac_setup(struct platform_device *pdev)
+{
+        struct rk_priv_data *bsp_priv;
+        struct device *dev = &pdev->dev;
+        int ret;
+        const char *strings = NULL;
+        int value;
+
+        bsp_priv = devm_kzalloc(dev, sizeof(*bsp_priv), GFP_KERNEL);
+        if (!bsp_priv)
+                return ERR_PTR(-ENOMEM);
+
+        bsp_priv->phy_iface = of_get_phy_mode(dev->of_node);
+
+        ret = of_property_read_string(dev->of_node, "phy_regulator", &strings);
+        if (ret) {
+                dev_warn(dev, "%s: Can not read property: phy_regulator.\n",
+                         __func__);
+        } else {
+                dev_info(dev, "%s: PHY power controlled by regulator(%s).\n",
+                         __func__, strings);
+                strcpy(bsp_priv->regulator, strings);
+        }
+
+        ret = of_property_read_string(dev->of_node, "clock_in_out", &strings);
+        if (ret) {
+                dev_err(dev, "%s: Can not read property: clock_in_out.\n",
+                        __func__);
+                bsp_priv->clock_input = true;
+        } else {
+                dev_info(dev, "%s: clock input or output? (%s).\n",
+                         __func__, strings);
+                if (!strcmp(strings, "input"))
+                        bsp_priv->clock_input = true;
+                else
+                        bsp_priv->clock_input = false;
+        }
+
+        ret = of_property_read_u32(dev->of_node, "tx_delay", &value);
+        if (ret) {
+                bsp_priv->tx_delay = 0x30;
+                dev_err(dev, "%s: Can not read property: tx_delay.", __func__);
+                dev_err(dev, "%s: set tx_delay to 0x%x\n",
+                        __func__, bsp_priv->tx_delay);
+        } else {
+                dev_info(dev, "%s: TX delay(0x%x).\n", __func__, value);
+                bsp_priv->tx_delay = value;
+        }
+
+        ret = of_property_read_u32(dev->of_node, "rx_delay", &value);
+        if (ret) {
+                bsp_priv->rx_delay = 0x10;
+                dev_err(dev, "%s: Can not read property: rx_delay.", __func__);
+                dev_err(dev, "%s: set rx_delay to 0x%x\n",
+                        __func__, bsp_priv->rx_delay);
+        } else {
+                dev_info(dev, "%s: RX delay(0x%x).\n", __func__, value);
+                bsp_priv->rx_delay = value;
+        }
+
+        bsp_priv->grf = syscon_regmap_lookup_by_phandle(dev->of_node,
+                                                        "rockchip,grf");
+        bsp_priv->pdev = pdev;
+
+        /*rmii or rgmii*/
+        if (bsp_priv->phy_iface == PHY_INTERFACE_MODE_RGMII) {
+                dev_info(dev, "%s: init for RGMII\n", __func__);
+                set_to_rgmii(bsp_priv, bsp_priv->tx_delay, bsp_priv->rx_delay);
+        } else if (bsp_priv->phy_iface == PHY_INTERFACE_MODE_RMII) {
+                dev_info(dev, "%s: init for RMII\n", __func__);
+                set_to_rmii(bsp_priv);
+        } else {
+                dev_err(dev, "%s: NO interface defined!\n", __func__);
+        }
+
+        gmac_clk_init(bsp_priv);
+
+        return bsp_priv;
+}
+
+static int rk_gmac_init(struct platform_device *pdev, void *priv)
+{
+        struct rk_priv_data *bsp_priv = priv;
+        int ret;
+
+        ret = phy_power_on(bsp_priv, true);
+        if (ret)
+                return ret;
+
+        ret = gmac_clk_enable(bsp_priv, true);
+        if (ret)
+                return ret;
+
+        return 0;
+}
+
+static void rk_gmac_exit(struct platform_device *pdev, void *priv)
+{
+        struct rk_priv_data *gmac = priv;
+
+        phy_power_on(gmac, false);
+        gmac_clk_enable(gmac, false);
+}
+
+static void rk_fix_speed(void *priv, unsigned int speed)
+{
+        struct rk_priv_data *bsp_priv = priv;
+        struct device *dev = &bsp_priv->pdev->dev;
+
+        if (bsp_priv->phy_iface == PHY_INTERFACE_MODE_RGMII)
+                set_rgmii_speed(bsp_priv, speed);
+        else if (bsp_priv->phy_iface == PHY_INTERFACE_MODE_RMII)
+                set_rmii_speed(bsp_priv, speed);
+        else
+                dev_err(dev, "unsupported interface %d", bsp_priv->phy_iface);
+}
+
+const struct stmmac_of_data rk3288_gmac_data = {
+        .has_gmac = 1,
+        .fix_mac_speed = rk_fix_speed,
+        .setup = rk_gmac_setup,
+        .init = rk_gmac_init,
+        .exit = rk_gmac_exit,
+};
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
index 3039de2465ba..879e29f48a89 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
@@ -33,6 +33,7 @@
 
 static const struct of_device_id stmmac_dt_ids[] = {
         /* SoC specific glue layers should come before generic bindings */
+        { .compatible = "rockchip,rk3288-gmac", .data = &rk3288_gmac_data},
         { .compatible = "amlogic,meson6-dwmac", .data = &meson6_dwmac_data},
         { .compatible = "allwinner,sun7i-a20-gmac", .data = &sun7i_gmac_data},
         { .compatible = "st,stih415-dwmac", .data = &stih4xx_dwmac_data},
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.h b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.h
index 25dd1f7ace02..093eb99e5ffd 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.h
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.h
@@ -24,5 +24,6 @@ extern const struct stmmac_of_data sun7i_gmac_data;
 extern const struct stmmac_of_data stih4xx_dwmac_data;
 extern const struct stmmac_of_data stid127_dwmac_data;
 extern const struct stmmac_of_data socfpga_gmac_data;
+extern const struct stmmac_of_data rk3288_gmac_data;
 
 #endif /* __STMMAC_PLATFORM_H__ */