--- /dev/null
+/*
+ * HiSilicon INNO USB2 PHY Driver.
+ *
+ * Copyright (c) 2016-2017 HiSilicon Technologies Co., Ltd.
+ *
+ * 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.
+ *
+ * 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/clk.h>
+#include <linux/delay.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/phy/phy.h>
+#include <linux/reset.h>
+
+#define INNO_PHY_PORT_NUM 2
+#define REF_CLK_STABLE_TIME 100 /* unit:us */
+#define UTMI_CLK_STABLE_TIME 200 /* unit:us */
+#define TEST_CLK_STABLE_TIME 2 /* unit:ms */
+#define PHY_CLK_STABLE_TIME 2 /* unit:ms */
+#define UTMI_RST_COMPLETE_TIME 2 /* unit:ms */
+#define POR_RST_COMPLETE_TIME 300 /* unit:us */
+#define PHY_TEST_DATA GENMASK(7, 0)
+#define PHY_TEST_ADDR GENMASK(15, 8)
+#define PHY_TEST_PORT GENMASK(18, 16)
+#define PHY_TEST_WREN BIT(21)
+#define PHY_TEST_CLK BIT(22) /* rising edge active */
+#define PHY_TEST_RST BIT(23) /* low active */
+#define PHY_CLK_ENABLE BIT(2)
+
+struct hisi_inno_phy_port {
+ struct reset_control *utmi_rst;
+ struct hisi_inno_phy_priv *priv;
+};
+
+struct hisi_inno_phy_priv {
+ void __iomem *mmio;
+ struct clk *ref_clk;
+ struct reset_control *por_rst;
+ struct hisi_inno_phy_port ports[INNO_PHY_PORT_NUM];
+};
+
+static void hisi_inno_phy_write_reg(struct hisi_inno_phy_priv *priv,
+ u8 port, u32 addr, u32 data)
+{
+ void __iomem *reg = priv->mmio;
+ u32 val;
+
+ val = (data & PHY_TEST_DATA) |
+ ((addr << 8) & PHY_TEST_ADDR) |
+ ((port << 16) & PHY_TEST_PORT) |
+ PHY_TEST_WREN | PHY_TEST_RST;
+ writel(val, reg);
+
+ val |= PHY_TEST_CLK;
+ writel(val, reg);
+
+ val &= ~PHY_TEST_CLK;
+ writel(val, reg);
+}
+
+static void hisi_inno_phy_setup(struct hisi_inno_phy_priv *priv)
+{
+ /* The phy clk is controlled by the port0 register 0x06. */
+ hisi_inno_phy_write_reg(priv, 0, 0x06, PHY_CLK_ENABLE);
+ msleep(PHY_CLK_STABLE_TIME);
+}
+
+static int hisi_inno_phy_init(struct phy *phy)
+{
+ struct hisi_inno_phy_port *port = phy_get_drvdata(phy);
+ struct hisi_inno_phy_priv *priv = port->priv;
+ int ret;
+
+ ret = clk_prepare_enable(priv->ref_clk);
+ if (ret)
+ return ret;
+ udelay(REF_CLK_STABLE_TIME);
+
+ reset_control_deassert(priv->por_rst);
+ udelay(POR_RST_COMPLETE_TIME);
+
+ /* Set up phy registers */
+ hisi_inno_phy_setup(priv);
+
+ reset_control_deassert(port->utmi_rst);
+ udelay(UTMI_RST_COMPLETE_TIME);
+
+ return 0;
+}
+
+static int hisi_inno_phy_exit(struct phy *phy)
+{
+ struct hisi_inno_phy_port *port = phy_get_drvdata(phy);
+ struct hisi_inno_phy_priv *priv = port->priv;
+
+ reset_control_assert(port->utmi_rst);
+ reset_control_assert(priv->por_rst);
+ clk_disable_unprepare(priv->ref_clk);
+
+ return 0;
+}
+
+static const struct phy_ops hisi_inno_phy_ops = {
+ .init = hisi_inno_phy_init,
+ .exit = hisi_inno_phy_exit,
+ .owner = THIS_MODULE,
+};
+
+static int hisi_inno_phy_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct device_node *np = dev->of_node;
+ struct hisi_inno_phy_priv *priv;
+ struct phy_provider *provider;
+ struct device_node *child;
+ struct resource *res;
+ int i = 0;
+ int ret;
+
+ priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ priv->mmio = devm_ioremap_resource(dev, res);
+ if (IS_ERR(priv->mmio)) {
+ ret = PTR_ERR(priv->mmio);
+ return ret;
+ }
+
+ priv->ref_clk = devm_clk_get(dev, NULL);
+ if (IS_ERR(priv->ref_clk))
+ return PTR_ERR(priv->ref_clk);
+
+ priv->por_rst = devm_reset_control_get_exclusive(dev, NULL);
+ if (IS_ERR(priv->por_rst))
+ return PTR_ERR(priv->por_rst);
+
+ for_each_child_of_node(np, child) {
+ struct reset_control *rst;
+ struct phy *phy;
+
+ rst = of_reset_control_get_exclusive(child, NULL);
+ if (IS_ERR(rst))
+ return PTR_ERR(rst);
+ priv->ports[i].utmi_rst = rst;
+ priv->ports[i].priv = priv;
+
+ phy = devm_phy_create(dev, child, &hisi_inno_phy_ops);
+ if (IS_ERR(phy))
+ return PTR_ERR(phy);
+
+ phy_set_bus_width(phy, 8);
+ phy_set_drvdata(phy, &priv->ports[i]);
+ i++;
+
+ if (i > INNO_PHY_PORT_NUM) {
+ dev_warn(dev, "Support %d ports in maximum\n", i);
+ break;
+ }
+ }
+
+ provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
+ return PTR_ERR_OR_ZERO(provider);
+}
+
+static const struct of_device_id hisi_inno_phy_of_match[] = {
+ { .compatible = "hisilicon,inno-usb2-phy", },
+ { .compatible = "hisilicon,hi3798cv200-usb2-phy", },
+ { },
+};
+MODULE_DEVICE_TABLE(of, hisi_inno_phy_of_match);
+
+static struct platform_driver hisi_inno_phy_driver = {
+ .probe = hisi_inno_phy_probe,
+ .driver = {
+ .name = "hisi-inno-phy",
+ .of_match_table = hisi_inno_phy_of_match,
+ }
+};
+module_platform_driver(hisi_inno_phy_driver);
+
+MODULE_DESCRIPTION("HiSilicon INNO USB2 PHY Driver");
+MODULE_LICENSE("GPL v2");
projects / linux-2.6-microblaze.git / blobdiff