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Diffstat (limited to '')
-rw-r--r-- | drivers/phy/hisilicon/phy-histb-combphy.c | 284 |
1 files changed, 284 insertions, 0 deletions
diff --git a/drivers/phy/hisilicon/phy-histb-combphy.c b/drivers/phy/hisilicon/phy-histb-combphy.c new file mode 100644 index 000000000..f1cb3e4d2 --- /dev/null +++ b/drivers/phy/hisilicon/phy-histb-combphy.c @@ -0,0 +1,284 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * COMBPHY driver for HiSilicon STB SoCs + * + * Copyright (C) 2016-2017 HiSilicon Co., Ltd. http://www.hisilicon.com + * + * Authors: Jianguo Sun <sunjianguo1@huawei.com> + */ + +#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; + u32 vals[3]; + int ret; + + priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + priv->mmio = devm_platform_ioremap_resource(pdev, 0); + 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"); 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