--- /dev/null
+/*
+ * COMBPHY driver for HiSilicon STB SoCs
+ *
+ * Copyright (C) 2016-2017 HiSilicon Co., Ltd. http://www.hisilicon.com
+ *
+ * Authors: Jianguo Sun <sunjianguo1@huawei.com>
+ *
+ * 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.
+ */
+
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/mfd/syscon.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/phy/phy.h>
+#include <linux/regmap.h>
+#include <linux/reset.h>
+#include <dt-bindings/phy/phy.h>
+
+#define COMBPHY_MODE_PCIE 0
+#define COMBPHY_MODE_USB3 1
+#define COMBPHY_MODE_SATA 2
+
+#define COMBPHY_CFG_REG 0x0
+#define COMBPHY_BYPASS_CODEC BIT(31)
+#define COMBPHY_TEST_WRITE BIT(24)
+#define COMBPHY_TEST_DATA_SHIFT 20
+#define COMBPHY_TEST_DATA_MASK GENMASK(23, 20)
+#define COMBPHY_TEST_ADDR_SHIFT 12
+#define COMBPHY_TEST_ADDR_MASK GENMASK(16, 12)
+#define COMBPHY_CLKREF_OUT_OEN BIT(0)
+
+struct histb_combphy_mode {
+ int fixed;
+ int select;
+ u32 reg;
+ u32 shift;
+ u32 mask;
+};
+
+struct histb_combphy_priv {
+ void __iomem *mmio;
+ struct regmap *syscon;
+ struct reset_control *por_rst;
+ struct clk *ref_clk;
+ struct phy *phy;
+ struct histb_combphy_mode mode;
+};
+
+static void nano_register_write(struct histb_combphy_priv *priv,
+ u32 addr, u32 data)
+{
+ void __iomem *reg = priv->mmio + COMBPHY_CFG_REG;
+ u32 val;
+
+ /* Set up address and data for the write */
+ val = readl(reg);
+ val &= ~COMBPHY_TEST_ADDR_MASK;
+ val |= addr << COMBPHY_TEST_ADDR_SHIFT;
+ val &= ~COMBPHY_TEST_DATA_MASK;
+ val |= data << COMBPHY_TEST_DATA_SHIFT;
+ writel(val, reg);
+
+ /* Flip strobe control to trigger the write */
+ val &= ~COMBPHY_TEST_WRITE;
+ writel(val, reg);
+ val |= COMBPHY_TEST_WRITE;
+ writel(val, reg);
+}
+
+static int is_mode_fixed(struct histb_combphy_mode *mode)
+{
+ return (mode->fixed != PHY_NONE) ? true : false;
+}
+
+static int histb_combphy_set_mode(struct histb_combphy_priv *priv)
+{
+ struct histb_combphy_mode *mode = &priv->mode;
+ struct regmap *syscon = priv->syscon;
+ u32 hw_sel;
+
+ if (is_mode_fixed(mode))
+ return 0;
+
+ switch (mode->select) {
+ case PHY_TYPE_SATA:
+ hw_sel = COMBPHY_MODE_SATA;
+ break;
+ case PHY_TYPE_PCIE:
+ hw_sel = COMBPHY_MODE_PCIE;
+ break;
+ case PHY_TYPE_USB3:
+ hw_sel = COMBPHY_MODE_USB3;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return regmap_update_bits(syscon, mode->reg, mode->mask,
+ hw_sel << mode->shift);
+}
+
+static int histb_combphy_init(struct phy *phy)
+{
+ struct histb_combphy_priv *priv = phy_get_drvdata(phy);
+ u32 val;
+ int ret;
+
+ ret = histb_combphy_set_mode(priv);
+ if (ret)
+ return ret;
+
+ /* Clear bypass bit to enable encoding/decoding */
+ val = readl(priv->mmio + COMBPHY_CFG_REG);
+ val &= ~COMBPHY_BYPASS_CODEC;
+ writel(val, priv->mmio + COMBPHY_CFG_REG);
+
+ ret = clk_prepare_enable(priv->ref_clk);
+ if (ret)
+ return ret;
+
+ reset_control_deassert(priv->por_rst);
+
+ /* Enable EP clock */
+ val = readl(priv->mmio + COMBPHY_CFG_REG);
+ val |= COMBPHY_CLKREF_OUT_OEN;
+ writel(val, priv->mmio + COMBPHY_CFG_REG);
+
+ /* Need to wait for EP clock stable */
+ mdelay(5);
+
+ /* Configure nano phy registers as suggested by vendor */
+ nano_register_write(priv, 0x1, 0x8);
+ nano_register_write(priv, 0xc, 0x9);
+ nano_register_write(priv, 0x1a, 0x4);
+
+ return 0;
+}
+
+static int histb_combphy_exit(struct phy *phy)
+{
+ struct histb_combphy_priv *priv = phy_get_drvdata(phy);
+ u32 val;
+
+ /* Disable EP clock */
+ val = readl(priv->mmio + COMBPHY_CFG_REG);
+ val &= ~COMBPHY_CLKREF_OUT_OEN;
+ writel(val, priv->mmio + COMBPHY_CFG_REG);
+
+ reset_control_assert(priv->por_rst);
+ clk_disable_unprepare(priv->ref_clk);
+
+ return 0;
+}
+
+static const struct phy_ops histb_combphy_ops = {
+ .init = histb_combphy_init,
+ .exit = histb_combphy_exit,
+ .owner = THIS_MODULE,
+};
+
+static struct phy *histb_combphy_xlate(struct device *dev,
+ struct of_phandle_args *args)
+{
+ struct histb_combphy_priv *priv = dev_get_drvdata(dev);
+ struct histb_combphy_mode *mode = &priv->mode;
+
+ if (args->args_count < 1) {
+ dev_err(dev, "invalid number of arguments\n");
+ return ERR_PTR(-EINVAL);
+ }
+
+ mode->select = args->args[0];
+
+ if (mode->select < PHY_TYPE_SATA || mode->select > PHY_TYPE_USB3) {
+ dev_err(dev, "invalid phy mode select argument\n");
+ return ERR_PTR(-EINVAL);
+ }
+
+ if (is_mode_fixed(mode) && mode->select != mode->fixed) {
+ dev_err(dev, "mode select %d mismatch fixed phy mode %d\n",
+ mode->select, mode->fixed);
+ return ERR_PTR(-EINVAL);
+ }
+
+ return priv->phy;
+}
+
+static int histb_combphy_probe(struct platform_device *pdev)
+{
+ struct phy_provider *phy_provider;
+ struct device *dev = &pdev->dev;
+ struct histb_combphy_priv *priv;
+ struct device_node *np = dev->of_node;
+ struct histb_combphy_mode *mode;
+ struct resource *res;
+ u32 vals[3];
+ 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->syscon = syscon_node_to_regmap(np->parent);
+ if (IS_ERR(priv->syscon)) {
+ dev_err(dev, "failed to find peri_ctrl syscon regmap\n");
+ return PTR_ERR(priv->syscon);
+ }
+
+ mode = &priv->mode;
+ mode->fixed = PHY_NONE;
+
+ ret = of_property_read_u32(np, "hisilicon,fixed-mode", &mode->fixed);
+ if (ret == 0)
+ dev_dbg(dev, "found fixed phy mode %d\n", mode->fixed);
+
+ ret = of_property_read_u32_array(np, "hisilicon,mode-select-bits",
+ vals, ARRAY_SIZE(vals));
+ if (ret == 0) {
+ if (is_mode_fixed(mode)) {
+ dev_err(dev, "found select bits for fixed mode phy\n");
+ return -EINVAL;
+ }
+
+ mode->reg = vals[0];
+ mode->shift = vals[1];
+ mode->mask = vals[2];
+ dev_dbg(dev, "found mode select bits\n");
+ } else {
+ if (!is_mode_fixed(mode)) {
+ dev_err(dev, "no valid select bits found for non-fixed phy\n");
+ return -ENODEV;
+ }
+ }
+
+ priv->ref_clk = devm_clk_get(dev, NULL);
+ if (IS_ERR(priv->ref_clk)) {
+ dev_err(dev, "failed to find ref clock\n");
+ return PTR_ERR(priv->ref_clk);
+ }
+
+ priv->por_rst = devm_reset_control_get(dev, NULL);
+ if (IS_ERR(priv->por_rst)) {
+ dev_err(dev, "failed to get poweron reset\n");
+ return PTR_ERR(priv->por_rst);
+ }
+
+ priv->phy = devm_phy_create(dev, NULL, &histb_combphy_ops);
+ if (IS_ERR(priv->phy)) {
+ dev_err(dev, "failed to create combphy\n");
+ return PTR_ERR(priv->phy);
+ }
+
+ dev_set_drvdata(dev, priv);
+ phy_set_drvdata(priv->phy, priv);
+
+ phy_provider = devm_of_phy_provider_register(dev, histb_combphy_xlate);
+ return PTR_ERR_OR_ZERO(phy_provider);
+}
+
+static const struct of_device_id histb_combphy_of_match[] = {
+ { .compatible = "hisilicon,hi3798cv200-combphy" },
+ { },
+};
+MODULE_DEVICE_TABLE(of, histb_combphy_of_match);
+
+static struct platform_driver histb_combphy_driver = {
+ .probe = histb_combphy_probe,
+ .driver = {
+ .name = "combphy",
+ .of_match_table = histb_combphy_of_match,
+ },
+};
+module_platform_driver(histb_combphy_driver);
+
+MODULE_DESCRIPTION("HiSilicon STB COMBPHY driver");
+MODULE_LICENSE("GPL v2");
OSDN Git Service
