--- /dev/null
+/*
+ * Oxford Semiconductor OXNAS DWMAC glue layer
+ *
+ * Copyright (C) 2016 Neil Armstrong <narmstrong@baylibre.com>
+ * Copyright (C) 2014 Daniel Golle <daniel@makrotopia.org>
+ * Copyright (C) 2013 Ma Haijun <mahaijuns@gmail.com>
+ * Copyright (C) 2012 John Crispin <blogic@openwrt.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/device.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include <linux/mfd/syscon.h>
+#include <linux/stmmac.h>
+
+#include "stmmac_platform.h"
+
+/* System Control regmap offsets */
+#define OXNAS_DWMAC_CTRL_REGOFFSET 0x78
+#define OXNAS_DWMAC_DELAY_REGOFFSET 0x100
+
+/* Control Register */
+#define DWMAC_CKEN_RX_IN 14
+#define DWMAC_CKEN_RXN_OUT 13
+#define DWMAC_CKEN_RX_OUT 12
+#define DWMAC_CKEN_TX_IN 10
+#define DWMAC_CKEN_TXN_OUT 9
+#define DWMAC_CKEN_TX_OUT 8
+#define DWMAC_RX_SOURCE 7
+#define DWMAC_TX_SOURCE 6
+#define DWMAC_LOW_TX_SOURCE 4
+#define DWMAC_AUTO_TX_SOURCE 3
+#define DWMAC_RGMII 2
+#define DWMAC_SIMPLE_MUX 1
+#define DWMAC_CKEN_GTX 0
+
+/* Delay register */
+#define DWMAC_TX_VARDELAY_SHIFT 0
+#define DWMAC_TXN_VARDELAY_SHIFT 8
+#define DWMAC_RX_VARDELAY_SHIFT 16
+#define DWMAC_RXN_VARDELAY_SHIFT 24
+#define DWMAC_TX_VARDELAY(d) ((d) << DWMAC_TX_VARDELAY_SHIFT)
+#define DWMAC_TXN_VARDELAY(d) ((d) << DWMAC_TXN_VARDELAY_SHIFT)
+#define DWMAC_RX_VARDELAY(d) ((d) << DWMAC_RX_VARDELAY_SHIFT)
+#define DWMAC_RXN_VARDELAY(d) ((d) << DWMAC_RXN_VARDELAY_SHIFT)
+
+struct oxnas_dwmac {
+ struct device *dev;
+ struct clk *clk;
+ struct regmap *regmap;
+};
+
+static int oxnas_dwmac_init(struct oxnas_dwmac *dwmac)
+{
+ unsigned int value;
+ int ret;
+
+ /* Reset HW here before changing the glue configuration */
+ ret = device_reset(dwmac->dev);
+ if (ret)
+ return ret;
+
+ ret = clk_prepare_enable(dwmac->clk);
+ if (ret)
+ return ret;
+
+ ret = regmap_read(dwmac->regmap, OXNAS_DWMAC_CTRL_REGOFFSET, &value);
+ if (ret < 0) {
+ clk_disable_unprepare(dwmac->clk);
+ return ret;
+ }
+
+ /* Enable GMII_GTXCLK to follow GMII_REFCLK, required for gigabit PHY */
+ value |= BIT(DWMAC_CKEN_GTX) |
+ /* Use simple mux for 25/125 Mhz clock switching */
+ BIT(DWMAC_SIMPLE_MUX) |
+ /* set auto switch tx clock source */
+ BIT(DWMAC_AUTO_TX_SOURCE) |
+ /* enable tx & rx vardelay */
+ BIT(DWMAC_CKEN_TX_OUT) |
+ BIT(DWMAC_CKEN_TXN_OUT) |
+ BIT(DWMAC_CKEN_TX_IN) |
+ BIT(DWMAC_CKEN_RX_OUT) |
+ BIT(DWMAC_CKEN_RXN_OUT) |
+ BIT(DWMAC_CKEN_RX_IN);
+ regmap_write(dwmac->regmap, OXNAS_DWMAC_CTRL_REGOFFSET, value);
+
+ /* set tx & rx vardelay */
+ value = DWMAC_TX_VARDELAY(4) |
+ DWMAC_TXN_VARDELAY(2) |
+ DWMAC_RX_VARDELAY(10) |
+ DWMAC_RXN_VARDELAY(8);
+ regmap_write(dwmac->regmap, OXNAS_DWMAC_DELAY_REGOFFSET, value);
+
+ return 0;
+}
+
+static int oxnas_dwmac_probe(struct platform_device *pdev)
+{
+ struct plat_stmmacenet_data *plat_dat;
+ struct stmmac_resources stmmac_res;
+ struct device_node *sysctrl;
+ struct oxnas_dwmac *dwmac;
+ int ret;
+
+ sysctrl = of_parse_phandle(pdev->dev.of_node, "oxsemi,sys-ctrl", 0);
+ if (!sysctrl) {
+ dev_err(&pdev->dev, "failed to get sys-ctrl node\n");
+ return -EINVAL;
+ }
+
+ 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)
+ return -ENOMEM;
+
+ dwmac->dev = &pdev->dev;
+ plat_dat->bsp_priv = dwmac;
+
+ dwmac->regmap = syscon_node_to_regmap(sysctrl);
+ if (IS_ERR(dwmac->regmap)) {
+ dev_err(&pdev->dev, "failed to have sysctrl regmap\n");
+ return PTR_ERR(dwmac->regmap);
+ }
+
+ dwmac->clk = devm_clk_get(&pdev->dev, "gmac");
+ if (IS_ERR(dwmac->clk))
+ return PTR_ERR(dwmac->clk);
+
+ ret = oxnas_dwmac_init(dwmac);
+ if (ret)
+ return ret;
+
+ ret = stmmac_dvr_probe(&pdev->dev, plat_dat, &stmmac_res);
+ if (ret)
+ clk_disable_unprepare(dwmac->clk);
+
+ return ret;
+}
+
+static int oxnas_dwmac_remove(struct platform_device *pdev)
+{
+ struct oxnas_dwmac *dwmac = get_stmmac_bsp_priv(&pdev->dev);
+ int ret = stmmac_dvr_remove(&pdev->dev);
+
+ clk_disable_unprepare(dwmac->clk);
+
+ return ret;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int oxnas_dwmac_suspend(struct device *dev)
+{
+ struct oxnas_dwmac *dwmac = get_stmmac_bsp_priv(dev);
+ int ret;
+
+ ret = stmmac_suspend(dev);
+ clk_disable_unprepare(dwmac->clk);
+
+ return ret;
+}
+
+static int oxnas_dwmac_resume(struct device *dev)
+{
+ struct oxnas_dwmac *dwmac = get_stmmac_bsp_priv(dev);
+ int ret;
+
+ ret = oxnas_dwmac_init(dwmac);
+ if (ret)
+ return ret;
+
+ ret = stmmac_resume(dev);
+
+ return ret;
+}
+#endif /* CONFIG_PM_SLEEP */
+
+static SIMPLE_DEV_PM_OPS(oxnas_dwmac_pm_ops,
+ oxnas_dwmac_suspend, oxnas_dwmac_resume);
+
+static const struct of_device_id oxnas_dwmac_match[] = {
+ { .compatible = "oxsemi,ox820-dwmac" },
+ { }
+};
+MODULE_DEVICE_TABLE(of, oxnas_dwmac_match);
+
+static struct platform_driver oxnas_dwmac_driver = {
+ .probe = oxnas_dwmac_probe,
+ .remove = oxnas_dwmac_remove,
+ .driver = {
+ .name = "oxnas-dwmac",
+ .pm = &oxnas_dwmac_pm_ops,
+ .of_match_table = oxnas_dwmac_match,
+ },
+};
+module_platform_driver(oxnas_dwmac_driver);
+
+MODULE_AUTHOR("Neil Armstrong <narmstrong@baylibre.com>");
+MODULE_DESCRIPTION("Oxford Semiconductor OXNAS DWMAC glue layer");
+MODULE_LICENSE("GPL v2");
projects / GitHub / moto-9609 / android_kernel_motorola_exynos9610.git / commitdiff