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127 lines
2.9 KiB
127 lines
2.9 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* phy-mvebu-sata.c: SATA Phy driver for the Marvell mvebu SoCs. |
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* |
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* Copyright (C) 2013 Andrew Lunn <[email protected]> |
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*/ |
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#include <linux/kernel.h> |
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#include <linux/init.h> |
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#include <linux/clk.h> |
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#include <linux/phy/phy.h> |
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#include <linux/io.h> |
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#include <linux/platform_device.h> |
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struct priv { |
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struct clk *clk; |
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void __iomem *base; |
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}; |
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#define SATA_PHY_MODE_2 0x0330 |
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#define MODE_2_FORCE_PU_TX BIT(0) |
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#define MODE_2_FORCE_PU_RX BIT(1) |
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#define MODE_2_PU_PLL BIT(2) |
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#define MODE_2_PU_IVREF BIT(3) |
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#define SATA_IF_CTRL 0x0050 |
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#define CTRL_PHY_SHUTDOWN BIT(9) |
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static int phy_mvebu_sata_power_on(struct phy *phy) |
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{ |
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struct priv *priv = phy_get_drvdata(phy); |
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u32 reg; |
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clk_prepare_enable(priv->clk); |
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/* Enable PLL and IVREF */ |
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reg = readl(priv->base + SATA_PHY_MODE_2); |
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reg |= (MODE_2_FORCE_PU_TX | MODE_2_FORCE_PU_RX | |
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MODE_2_PU_PLL | MODE_2_PU_IVREF); |
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writel(reg , priv->base + SATA_PHY_MODE_2); |
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/* Enable PHY */ |
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reg = readl(priv->base + SATA_IF_CTRL); |
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reg &= ~CTRL_PHY_SHUTDOWN; |
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writel(reg, priv->base + SATA_IF_CTRL); |
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clk_disable_unprepare(priv->clk); |
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return 0; |
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} |
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static int phy_mvebu_sata_power_off(struct phy *phy) |
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{ |
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struct priv *priv = phy_get_drvdata(phy); |
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u32 reg; |
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clk_prepare_enable(priv->clk); |
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/* Disable PLL and IVREF */ |
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reg = readl(priv->base + SATA_PHY_MODE_2); |
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reg &= ~(MODE_2_FORCE_PU_TX | MODE_2_FORCE_PU_RX | |
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MODE_2_PU_PLL | MODE_2_PU_IVREF); |
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writel(reg, priv->base + SATA_PHY_MODE_2); |
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/* Disable PHY */ |
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reg = readl(priv->base + SATA_IF_CTRL); |
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reg |= CTRL_PHY_SHUTDOWN; |
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writel(reg, priv->base + SATA_IF_CTRL); |
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clk_disable_unprepare(priv->clk); |
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return 0; |
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} |
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static const struct phy_ops phy_mvebu_sata_ops = { |
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.power_on = phy_mvebu_sata_power_on, |
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.power_off = phy_mvebu_sata_power_off, |
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.owner = THIS_MODULE, |
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}; |
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static int phy_mvebu_sata_probe(struct platform_device *pdev) |
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{ |
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struct phy_provider *phy_provider; |
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struct priv *priv; |
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struct phy *phy; |
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priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL); |
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if (!priv) |
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return -ENOMEM; |
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priv->base = devm_platform_ioremap_resource(pdev, 0); |
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if (IS_ERR(priv->base)) |
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return PTR_ERR(priv->base); |
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priv->clk = devm_clk_get(&pdev->dev, "sata"); |
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if (IS_ERR(priv->clk)) |
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return PTR_ERR(priv->clk); |
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phy = devm_phy_create(&pdev->dev, NULL, &phy_mvebu_sata_ops); |
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if (IS_ERR(phy)) |
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return PTR_ERR(phy); |
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phy_set_drvdata(phy, priv); |
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phy_provider = devm_of_phy_provider_register(&pdev->dev, |
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of_phy_simple_xlate); |
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if (IS_ERR(phy_provider)) |
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return PTR_ERR(phy_provider); |
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/* The boot loader may of left it on. Turn it off. */ |
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phy_mvebu_sata_power_off(phy); |
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return 0; |
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} |
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static const struct of_device_id phy_mvebu_sata_of_match[] = { |
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{ .compatible = "marvell,mvebu-sata-phy" }, |
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{ }, |
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}; |
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static struct platform_driver phy_mvebu_sata_driver = { |
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.probe = phy_mvebu_sata_probe, |
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.driver = { |
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.name = "phy-mvebu-sata", |
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.of_match_table = phy_mvebu_sata_of_match, |
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} |
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}; |
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builtin_platform_driver(phy_mvebu_sata_driver);
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