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149 lines
3.3 KiB
149 lines
3.3 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Renesas R-Car Gen3 PCIe PHY driver |
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* |
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* Copyright (C) 2018 Cogent Embedded, Inc. |
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*/ |
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#include <linux/clk.h> |
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#include <linux/io.h> |
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#include <linux/module.h> |
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#include <linux/of.h> |
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#include <linux/phy/phy.h> |
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#include <linux/of_device.h> |
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#include <linux/platform_device.h> |
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#include <linux/spinlock.h> |
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#define PHY_CTRL 0x4000 /* R8A77980 only */ |
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/* PHY control register (PHY_CTRL) */ |
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#define PHY_CTRL_PHY_PWDN BIT(2) |
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struct rcar_gen3_phy { |
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struct phy *phy; |
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spinlock_t lock; |
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void __iomem *base; |
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}; |
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static void rcar_gen3_phy_pcie_modify_reg(struct phy *p, unsigned int reg, |
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u32 clear, u32 set) |
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{ |
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struct rcar_gen3_phy *phy = phy_get_drvdata(p); |
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void __iomem *base = phy->base; |
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unsigned long flags; |
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u32 value; |
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spin_lock_irqsave(&phy->lock, flags); |
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value = readl(base + reg); |
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value &= ~clear; |
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value |= set; |
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writel(value, base + reg); |
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spin_unlock_irqrestore(&phy->lock, flags); |
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} |
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static int r8a77980_phy_pcie_power_on(struct phy *p) |
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{ |
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/* Power on the PCIe PHY */ |
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rcar_gen3_phy_pcie_modify_reg(p, PHY_CTRL, PHY_CTRL_PHY_PWDN, 0); |
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return 0; |
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} |
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static int r8a77980_phy_pcie_power_off(struct phy *p) |
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{ |
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/* Power off the PCIe PHY */ |
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rcar_gen3_phy_pcie_modify_reg(p, PHY_CTRL, 0, PHY_CTRL_PHY_PWDN); |
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return 0; |
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} |
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static const struct phy_ops r8a77980_phy_pcie_ops = { |
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.power_on = r8a77980_phy_pcie_power_on, |
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.power_off = r8a77980_phy_pcie_power_off, |
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.owner = THIS_MODULE, |
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}; |
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static const struct of_device_id rcar_gen3_phy_pcie_match_table[] = { |
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{ .compatible = "renesas,r8a77980-pcie-phy" }, |
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{ } |
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}; |
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MODULE_DEVICE_TABLE(of, rcar_gen3_phy_pcie_match_table); |
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static int rcar_gen3_phy_pcie_probe(struct platform_device *pdev) |
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{ |
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struct device *dev = &pdev->dev; |
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struct phy_provider *provider; |
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struct rcar_gen3_phy *phy; |
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void __iomem *base; |
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int error; |
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if (!dev->of_node) { |
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dev_err(dev, |
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"This driver must only be instantiated from the device tree\n"); |
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return -EINVAL; |
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} |
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base = devm_platform_ioremap_resource(pdev, 0); |
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if (IS_ERR(base)) |
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return PTR_ERR(base); |
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phy = devm_kzalloc(dev, sizeof(*phy), GFP_KERNEL); |
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if (!phy) |
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return -ENOMEM; |
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spin_lock_init(&phy->lock); |
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phy->base = base; |
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/* |
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* devm_phy_create() will call pm_runtime_enable(&phy->dev); |
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* And then, phy-core will manage runtime PM for this device. |
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*/ |
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pm_runtime_enable(dev); |
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phy->phy = devm_phy_create(dev, NULL, &r8a77980_phy_pcie_ops); |
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if (IS_ERR(phy->phy)) { |
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dev_err(dev, "Failed to create PCIe PHY\n"); |
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error = PTR_ERR(phy->phy); |
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goto error; |
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} |
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phy_set_drvdata(phy->phy, phy); |
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provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate); |
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if (IS_ERR(provider)) { |
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dev_err(dev, "Failed to register PHY provider\n"); |
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error = PTR_ERR(provider); |
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goto error; |
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} |
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return 0; |
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error: |
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pm_runtime_disable(dev); |
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return error; |
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} |
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static int rcar_gen3_phy_pcie_remove(struct platform_device *pdev) |
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{ |
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pm_runtime_disable(&pdev->dev); |
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return 0; |
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}; |
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static struct platform_driver rcar_gen3_phy_driver = { |
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.driver = { |
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.name = "phy_rcar_gen3_pcie", |
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.of_match_table = rcar_gen3_phy_pcie_match_table, |
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}, |
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.probe = rcar_gen3_phy_pcie_probe, |
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.remove = rcar_gen3_phy_pcie_remove, |
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}; |
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module_platform_driver(rcar_gen3_phy_driver); |
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MODULE_LICENSE("GPL v2"); |
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MODULE_DESCRIPTION("Renesas R-Car Gen3 PCIe PHY"); |
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MODULE_AUTHOR("Sergei Shtylyov <[email protected]>");
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