1 files changed, 285 insertions, 0 deletions

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-visconti.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-visconti.c
new file mode 100644
index 000000000000..b7a0c57dfbfb
--- /dev/null
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-visconti.c
@@ -0,0 +1,285 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Toshiba Visconti Ethernet Support
+ *
+ * (C) Copyright 2020 TOSHIBA CORPORATION
+ * (C) Copyright 2020 Toshiba Electronic Devices & Storage Corporation
+ */
+
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/of_net.h>
+#include <linux/stmmac.h>
+
+#include "stmmac_platform.h"
+#include "dwmac4.h"
+
+#define REG_ETHER_CONTROL	0x52D4
+#define ETHER_ETH_CONTROL_RESET BIT(17)
+
+#define REG_ETHER_CLOCK_SEL	0x52D0
+#define ETHER_CLK_SEL_TX_CLK_EN BIT(0)
+#define ETHER_CLK_SEL_RX_CLK_EN BIT(1)
+#define ETHER_CLK_SEL_RMII_CLK_EN BIT(2)
+#define ETHER_CLK_SEL_RMII_CLK_RST BIT(3)
+#define ETHER_CLK_SEL_DIV_SEL_2 BIT(4)
+#define ETHER_CLK_SEL_DIV_SEL_20 BIT(0)
+#define ETHER_CLK_SEL_FREQ_SEL_125M	(BIT(9) | BIT(8))
+#define ETHER_CLK_SEL_FREQ_SEL_50M	BIT(9)
+#define ETHER_CLK_SEL_FREQ_SEL_25M	BIT(8)
+#define ETHER_CLK_SEL_FREQ_SEL_2P5M	BIT(0)
+#define ETHER_CLK_SEL_TX_CLK_EXT_SEL_IN BIT(0)
+#define ETHER_CLK_SEL_TX_CLK_EXT_SEL_TXC BIT(10)
+#define ETHER_CLK_SEL_TX_CLK_EXT_SEL_DIV BIT(11)
+#define ETHER_CLK_SEL_RX_CLK_EXT_SEL_IN  BIT(0)
+#define ETHER_CLK_SEL_RX_CLK_EXT_SEL_RXC BIT(12)
+#define ETHER_CLK_SEL_RX_CLK_EXT_SEL_DIV BIT(13)
+#define ETHER_CLK_SEL_TX_CLK_O_TX_I	 BIT(0)
+#define ETHER_CLK_SEL_TX_CLK_O_RMII_I	 BIT(14)
+#define ETHER_CLK_SEL_TX_O_E_N_IN	 BIT(15)
+#define ETHER_CLK_SEL_RMII_CLK_SEL_IN	 BIT(0)
+#define ETHER_CLK_SEL_RMII_CLK_SEL_RX_C	 BIT(16)
+
+#define ETHER_CLK_SEL_RX_TX_CLK_EN (ETHER_CLK_SEL_RX_CLK_EN | ETHER_CLK_SEL_TX_CLK_EN)
+
+#define ETHER_CONFIG_INTF_MII 0
+#define ETHER_CONFIG_INTF_RGMII BIT(0)
+#define ETHER_CONFIG_INTF_RMII BIT(2)
+
+struct visconti_eth {
+	void __iomem *reg;
+	u32 phy_intf_sel;
+	struct clk *phy_ref_clk;
+	spinlock_t lock; /* lock to protect register update */
+};
+
+static void visconti_eth_fix_mac_speed(void *priv, unsigned int speed)
+{
+	struct visconti_eth *dwmac = priv;
+	unsigned int val, clk_sel_val;
+	unsigned long flags;
+
+	spin_lock_irqsave(&dwmac->lock, flags);
+
+	/* adjust link */
+	val = readl(dwmac->reg + MAC_CTRL_REG);
+	val &= ~(GMAC_CONFIG_PS | GMAC_CONFIG_FES);
+
+	switch (speed) {
+	case SPEED_1000:
+		if (dwmac->phy_intf_sel == ETHER_CONFIG_INTF_RGMII)
+			clk_sel_val = ETHER_CLK_SEL_FREQ_SEL_125M;
+		break;
+	case SPEED_100:
+		if (dwmac->phy_intf_sel == ETHER_CONFIG_INTF_RGMII)
+			clk_sel_val = ETHER_CLK_SEL_FREQ_SEL_25M;
+		if (dwmac->phy_intf_sel == ETHER_CONFIG_INTF_RMII)
+			clk_sel_val = ETHER_CLK_SEL_DIV_SEL_2;
+		val |= GMAC_CONFIG_PS | GMAC_CONFIG_FES;
+		break;
+	case SPEED_10:
+		if (dwmac->phy_intf_sel == ETHER_CONFIG_INTF_RGMII)
+			clk_sel_val = ETHER_CLK_SEL_FREQ_SEL_2P5M;
+		if (dwmac->phy_intf_sel == ETHER_CONFIG_INTF_RMII)
+			clk_sel_val = ETHER_CLK_SEL_DIV_SEL_20;
+		val |= GMAC_CONFIG_PS;
+		break;
+	default:
+		/* No bit control */
+		break;
+	}
+
+	writel(val, dwmac->reg + MAC_CTRL_REG);
+
+	/* Stop internal clock */
+	val = readl(dwmac->reg + REG_ETHER_CLOCK_SEL);
+	val &= ~(ETHER_CLK_SEL_RMII_CLK_EN | ETHER_CLK_SEL_RX_TX_CLK_EN);
+	val |= ETHER_CLK_SEL_TX_O_E_N_IN;
+	writel(val, dwmac->reg + REG_ETHER_CLOCK_SEL);
+
+	switch (dwmac->phy_intf_sel) {
+	case ETHER_CONFIG_INTF_RGMII:
+		val = clk_sel_val | ETHER_CLK_SEL_RX_CLK_EXT_SEL_RXC;
+		break;
+	case ETHER_CONFIG_INTF_RMII:
+		val = clk_sel_val | ETHER_CLK_SEL_RX_CLK_EXT_SEL_DIV |
+			ETHER_CLK_SEL_TX_CLK_EXT_SEL_TXC | ETHER_CLK_SEL_TX_O_E_N_IN |
+			ETHER_CLK_SEL_RMII_CLK_SEL_RX_C;
+		break;
+	case ETHER_CONFIG_INTF_MII:
+	default:
+		val = clk_sel_val | ETHER_CLK_SEL_RX_CLK_EXT_SEL_RXC |
+			ETHER_CLK_SEL_TX_CLK_EXT_SEL_DIV | ETHER_CLK_SEL_TX_O_E_N_IN |
+			ETHER_CLK_SEL_RMII_CLK_EN;
+		break;
+	}
+
+	/* Start clock */
+	writel(val, dwmac->reg + REG_ETHER_CLOCK_SEL);
+	val |= ETHER_CLK_SEL_RX_TX_CLK_EN;
+	writel(val, dwmac->reg + REG_ETHER_CLOCK_SEL);
+
+	val &= ~ETHER_CLK_SEL_TX_O_E_N_IN;
+	writel(val, dwmac->reg + REG_ETHER_CLOCK_SEL);
+
+	spin_unlock_irqrestore(&dwmac->lock, flags);
+}
+
+static int visconti_eth_init_hw(struct platform_device *pdev, struct plat_stmmacenet_data *plat_dat)
+{
+	struct visconti_eth *dwmac = plat_dat->bsp_priv;
+	unsigned int reg_val, clk_sel_val;
+
+	switch (plat_dat->phy_interface) {
+	case PHY_INTERFACE_MODE_RGMII:
+	case PHY_INTERFACE_MODE_RGMII_ID:
+	case PHY_INTERFACE_MODE_RGMII_RXID:
+	case PHY_INTERFACE_MODE_RGMII_TXID:
+		dwmac->phy_intf_sel = ETHER_CONFIG_INTF_RGMII;
+		break;
+	case PHY_INTERFACE_MODE_MII:
+		dwmac->phy_intf_sel = ETHER_CONFIG_INTF_MII;
+		break;
+	case PHY_INTERFACE_MODE_RMII:
+		dwmac->phy_intf_sel = ETHER_CONFIG_INTF_RMII;
+		break;
+	default:
+		dev_err(&pdev->dev, "Unsupported phy-mode (%d)\n", plat_dat->phy_interface);
+		return -EOPNOTSUPP;
+	}
+
+	reg_val = dwmac->phy_intf_sel;
+	writel(reg_val, dwmac->reg + REG_ETHER_CONTROL);
+
+	/* Enable TX/RX clock */
+	clk_sel_val = ETHER_CLK_SEL_FREQ_SEL_125M;
+	writel(clk_sel_val, dwmac->reg + REG_ETHER_CLOCK_SEL);
+
+	writel((clk_sel_val | ETHER_CLK_SEL_RMII_CLK_EN | ETHER_CLK_SEL_RX_TX_CLK_EN),
+	       dwmac->reg + REG_ETHER_CLOCK_SEL);
+
+	/* release internal-reset */
+	reg_val |= ETHER_ETH_CONTROL_RESET;
+	writel(reg_val, dwmac->reg + REG_ETHER_CONTROL);
+
+	return 0;
+}
+
+static int visconti_eth_clock_probe(struct platform_device *pdev,
+				    struct plat_stmmacenet_data *plat_dat)
+{
+	struct visconti_eth *dwmac = plat_dat->bsp_priv;
+	int err;
+
+	dwmac->phy_ref_clk = devm_clk_get(&pdev->dev, "phy_ref_clk");
+	if (IS_ERR(dwmac->phy_ref_clk)) {
+		dev_err(&pdev->dev, "phy_ref_clk clock not found.\n");
+		return PTR_ERR(dwmac->phy_ref_clk);
+	}
+
+	err = clk_prepare_enable(dwmac->phy_ref_clk);
+	if (err < 0) {
+		dev_err(&pdev->dev, "failed to enable phy_ref clock: %d\n", err);
+		return err;
+	}
+
+	return 0;
+}
+
+static int visconti_eth_clock_remove(struct platform_device *pdev)
+{
+	struct visconti_eth *dwmac = get_stmmac_bsp_priv(&pdev->dev);
+	struct net_device *ndev = platform_get_drvdata(pdev);
+	struct stmmac_priv *priv = netdev_priv(ndev);
+
+	clk_disable_unprepare(dwmac->phy_ref_clk);
+	clk_disable_unprepare(priv->plat->stmmac_clk);
+
+	return 0;
+}
+
+static int visconti_eth_dwmac_probe(struct platform_device *pdev)
+{
+	struct plat_stmmacenet_data *plat_dat;
+	struct stmmac_resources stmmac_res;
+	struct visconti_eth *dwmac;
+	int ret;
+
+	ret = stmmac_get_platform_resources(pdev, &stmmac_res);
+	if (ret)
+		return ret;
+
+	plat_dat = stmmac_probe_config_dt(pdev, &stmmac_res.mac);
+	if (IS_ERR(plat_dat))
+		return PTR_ERR(plat_dat);
+
+	dwmac = devm_kzalloc(&pdev->dev, sizeof(*dwmac), GFP_KERNEL);
+	if (!dwmac) {
+		ret = -ENOMEM;
+		goto remove_config;
+	}
+
+	dwmac->reg = stmmac_res.addr;
+	plat_dat->bsp_priv = dwmac;
+	plat_dat->fix_mac_speed = visconti_eth_fix_mac_speed;
+
+	ret = visconti_eth_clock_probe(pdev, plat_dat);
+	if (ret)
+		goto remove_config;
+
+	visconti_eth_init_hw(pdev, plat_dat);
+
+	plat_dat->dma_cfg->aal = 1;
+
+	ret = stmmac_dvr_probe(&pdev->dev, plat_dat, &stmmac_res);
+	if (ret)
+		goto remove;
+
+	return ret;
+
+remove:
+	visconti_eth_clock_remove(pdev);
+remove_config:
+	stmmac_remove_config_dt(pdev, plat_dat);
+
+	return ret;
+}
+
+static int visconti_eth_dwmac_remove(struct platform_device *pdev)
+{
+	struct net_device *ndev = platform_get_drvdata(pdev);
+	struct stmmac_priv *priv = netdev_priv(ndev);
+	int err;
+
+	err = stmmac_pltfr_remove(pdev);
+	if (err < 0)
+		dev_err(&pdev->dev, "failed to remove platform: %d\n", err);
+
+	err = visconti_eth_clock_remove(pdev);
+	if (err < 0)
+		dev_err(&pdev->dev, "failed to remove clock: %d\n", err);
+
+	stmmac_remove_config_dt(pdev, priv->plat);
+
+	return err;
+}
+
+static const struct of_device_id visconti_eth_dwmac_match[] = {
+	{ .compatible = "toshiba,visconti-dwmac" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, visconti_eth_dwmac_match);
+
+static struct platform_driver visconti_eth_dwmac_driver = {
+	.probe  = visconti_eth_dwmac_probe,
+	.remove = visconti_eth_dwmac_remove,
+	.driver = {
+		.name           = "visconti-eth-dwmac",
+		.of_match_table = visconti_eth_dwmac_match,
+	},
+};
+module_platform_driver(visconti_eth_dwmac_driver);
+
+MODULE_AUTHOR("Toshiba");
+MODULE_DESCRIPTION("Toshiba Visconti Ethernet DWMAC glue driver");
+MODULE_AUTHOR("Nobuhiro Iwamatsu <nobuhiro1.iwamatsu@toshiba.co.jp");
+MODULE_LICENSE("GPL v2");