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+/* Copyright OpenWrt.org (C) 2015.
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+ * Copyright Altera Corporation (C) 2014. All rights reserved.
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+ *
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+ * This program is free software; you can redistribute it and/or modify
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+ * it under the terms of the GNU General Public License, version 2,
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+ * as published by the Free Software Foundation.
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+ *
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+ * This program is distributed in the hope that it will be useful,
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+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+ * GNU General Public License for more details.
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+ *
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+ * You should have received a copy of the GNU General Public License
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+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
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+ *
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+ * Adopted from dwmac-socfpga.c
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+ * Based on code found in mach-oxnas.c
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+ */
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+
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+#include <linux/mfd/syscon.h>
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+#include <linux/of.h>
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+#include <linux/of_address.h>
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+#include <linux/of_net.h>
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+#include <linux/phy.h>
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+#include <linux/regmap.h>
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+#include <linux/reset.h>
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+#include <linux/stmmac.h>
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+#include <linux/version.h>
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+
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+#include <mach/hardware.h>
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+
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+#include "stmmac.h"
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+#include "stmmac_platform.h"
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+
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+struct oxnas_gmac {
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+ struct clk *clk;
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+};
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+
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+static int oxnas_gmac_init(struct platform_device *pdev, void *priv)
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+{
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+ struct oxnas_gmac *bsp_priv = priv;
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+ int ret = 0;
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+ unsigned value;
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+
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+ ret = device_reset(&pdev->dev);
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+ if (ret)
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+ return ret;
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+
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+ if (IS_ERR(bsp_priv->clk))
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+ return PTR_ERR(bsp_priv->clk);
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+ clk_prepare_enable(bsp_priv->clk);
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+
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+ value = readl(SYS_CTRL_GMAC_CTRL);
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+
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+ /* Enable GMII_GTXCLK to follow GMII_REFCLK, required for gigabit PHY */
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+ value |= BIT(SYS_CTRL_GMAC_CKEN_GTX);
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+ /* Use simple mux for 25/125 Mhz clock switching */
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+ value |= BIT(SYS_CTRL_GMAC_SIMPLE_MUX);
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+ /* set auto switch tx clock source */
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+ value |= BIT(SYS_CTRL_GMAC_AUTO_TX_SOURCE);
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+ /* enable tx & rx vardelay */
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+ value |= BIT(SYS_CTRL_GMAC_CKEN_TX_OUT);
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+ value |= BIT(SYS_CTRL_GMAC_CKEN_TXN_OUT);
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+ value |= BIT(SYS_CTRL_GMAC_CKEN_TX_IN);
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+ value |= BIT(SYS_CTRL_GMAC_CKEN_RX_OUT);
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+ value |= BIT(SYS_CTRL_GMAC_CKEN_RXN_OUT);
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+ value |= BIT(SYS_CTRL_GMAC_CKEN_RX_IN);
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+ writel(value, SYS_CTRL_GMAC_CTRL);
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+
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+ /* set tx & rx vardelay */
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+ value = 0;
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+ value |= SYS_CTRL_GMAC_TX_VARDELAY(4);
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+ value |= SYS_CTRL_GMAC_TXN_VARDELAY(2);
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+ value |= SYS_CTRL_GMAC_RX_VARDELAY(10);
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+ value |= SYS_CTRL_GMAC_RXN_VARDELAY(8);
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+ writel(value, SYS_CTRL_GMAC_DELAY_CTRL);
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+
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+ return 0;
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+}
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+
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+static void oxnas_gmac_exit(struct platform_device *pdev, void *priv)
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+{
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+ struct reset_control *rstc;
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+
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+ clk_disable_unprepare(priv);
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+ devm_clk_put(&pdev->dev, priv);
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+
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+ rstc = reset_control_get(&pdev->dev, NULL);
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+ if (!IS_ERR(rstc)) {
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+ reset_control_assert(rstc);
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+ reset_control_put(rstc);
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+ }
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+}
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+
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+#if LINUX_VERSION_CODE < KERNEL_VERSION(4,2,0)
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+static void *oxnas_gmac_probe(struct platform_device *pdev)
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+{
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+#else
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+static int oxnas_gmac_probe(struct platform_device *pdev)
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+{
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+ struct plat_stmmacenet_data *plat_dat;
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+ struct stmmac_resources stmmac_res;
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+ int ret;
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+#endif
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+ struct device *dev = &pdev->dev;
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+ struct oxnas_gmac *bsp_priv;
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+
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+ bsp_priv = devm_kzalloc(dev, sizeof(*bsp_priv), GFP_KERNEL);
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+ if (!bsp_priv)
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+#if LINUX_VERSION_CODE < KERNEL_VERSION(4,2,0)
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+ return ERR_PTR(-ENOMEM);
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+#else
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+ return -ENOMEM;
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+#endif
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+ bsp_priv->clk = devm_clk_get(dev, "gmac");
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+ if (IS_ERR(bsp_priv->clk))
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+#if LINUX_VERSION_CODE < KERNEL_VERSION(4,2,0)
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+ return bsp_priv->clk;
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+#else
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+ return PTR_ERR(bsp_priv->clk);
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+#endif
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+
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+#if LINUX_VERSION_CODE < KERNEL_VERSION(4,2,0)
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+ return bsp_priv;
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+#else
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+ ret = stmmac_get_platform_resources(pdev, &stmmac_res);
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+ if (ret)
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+ return ret;
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+
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+ plat_dat = stmmac_probe_config_dt(pdev, &stmmac_res.mac);
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+ if (IS_ERR(plat_dat))
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+ return PTR_ERR(plat_dat);
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+
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+ plat_dat->bsp_priv = bsp_priv;
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+ plat_dat->init = oxnas_gmac_init;
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+ plat_dat->exit = oxnas_gmac_exit;
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+
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+ ret = oxnas_gmac_init(pdev, bsp_priv);
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+ if (ret)
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+ return ret;
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+
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+ return stmmac_dvr_probe(dev, plat_dat, &stmmac_res);
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+#endif
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+}
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+
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+#if LINUX_VERSION_CODE < KERNEL_VERSION(4,2,0)
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+const struct stmmac_of_data oxnas_gmac_data = {
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+ .has_gmac = 1,
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+ .setup = oxnas_gmac_probe,
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+ .init = oxnas_gmac_init,
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+ .exit = oxnas_gmac_exit,
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+};
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+#else
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+static const struct of_device_id oxnas_gmac_match[] = {
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+ { .compatible = "plxtech,nas782x-gmac" },
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+ { }
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+};
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+MODULE_DEVICE_TABLE(of, oxnas_gmac_match);
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+
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+static struct platform_driver oxnas_gmac_driver = {
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+ .probe = oxnas_gmac_probe,
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+ .remove = stmmac_pltfr_remove,
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+ .driver = {
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+ .name = "oxnas-gmac",
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+ .pm = &stmmac_pltfr_pm_ops,
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+ .of_match_table = oxnas_gmac_match,
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+ },
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+};
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+module_platform_driver(oxnas_gmac_driver);
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+#endif
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+
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+MODULE_LICENSE("GPL v2");
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John Crispin