12ce7f2f4SSergei Shtylyov // SPDX-License-Identifier: GPL-2.0
22ce7f2f4SSergei Shtylyov /*
32ce7f2f4SSergei Shtylyov * Renesas R-Car Gen3 PCIe PHY driver
42ce7f2f4SSergei Shtylyov *
52ce7f2f4SSergei Shtylyov * Copyright (C) 2018 Cogent Embedded, Inc.
62ce7f2f4SSergei Shtylyov */
72ce7f2f4SSergei Shtylyov
82ce7f2f4SSergei Shtylyov #include <linux/clk.h>
92ce7f2f4SSergei Shtylyov #include <linux/io.h>
102ce7f2f4SSergei Shtylyov #include <linux/module.h>
112ce7f2f4SSergei Shtylyov #include <linux/of.h>
122ce7f2f4SSergei Shtylyov #include <linux/phy/phy.h>
132ce7f2f4SSergei Shtylyov #include <linux/platform_device.h>
142ce7f2f4SSergei Shtylyov #include <linux/spinlock.h>
152ce7f2f4SSergei Shtylyov
162ce7f2f4SSergei Shtylyov #define PHY_CTRL 0x4000 /* R8A77980 only */
172ce7f2f4SSergei Shtylyov
182ce7f2f4SSergei Shtylyov /* PHY control register (PHY_CTRL) */
192ce7f2f4SSergei Shtylyov #define PHY_CTRL_PHY_PWDN BIT(2)
202ce7f2f4SSergei Shtylyov
212ce7f2f4SSergei Shtylyov struct rcar_gen3_phy {
222ce7f2f4SSergei Shtylyov struct phy *phy;
232ce7f2f4SSergei Shtylyov spinlock_t lock;
242ce7f2f4SSergei Shtylyov void __iomem *base;
252ce7f2f4SSergei Shtylyov };
262ce7f2f4SSergei Shtylyov
rcar_gen3_phy_pcie_modify_reg(struct phy * p,unsigned int reg,u32 clear,u32 set)272ce7f2f4SSergei Shtylyov static void rcar_gen3_phy_pcie_modify_reg(struct phy *p, unsigned int reg,
282ce7f2f4SSergei Shtylyov u32 clear, u32 set)
292ce7f2f4SSergei Shtylyov {
302ce7f2f4SSergei Shtylyov struct rcar_gen3_phy *phy = phy_get_drvdata(p);
312ce7f2f4SSergei Shtylyov void __iomem *base = phy->base;
322ce7f2f4SSergei Shtylyov unsigned long flags;
332ce7f2f4SSergei Shtylyov u32 value;
342ce7f2f4SSergei Shtylyov
352ce7f2f4SSergei Shtylyov spin_lock_irqsave(&phy->lock, flags);
362ce7f2f4SSergei Shtylyov
372ce7f2f4SSergei Shtylyov value = readl(base + reg);
382ce7f2f4SSergei Shtylyov value &= ~clear;
392ce7f2f4SSergei Shtylyov value |= set;
402ce7f2f4SSergei Shtylyov writel(value, base + reg);
412ce7f2f4SSergei Shtylyov
422ce7f2f4SSergei Shtylyov spin_unlock_irqrestore(&phy->lock, flags);
432ce7f2f4SSergei Shtylyov }
442ce7f2f4SSergei Shtylyov
r8a77980_phy_pcie_power_on(struct phy * p)452ce7f2f4SSergei Shtylyov static int r8a77980_phy_pcie_power_on(struct phy *p)
462ce7f2f4SSergei Shtylyov {
472ce7f2f4SSergei Shtylyov /* Power on the PCIe PHY */
482ce7f2f4SSergei Shtylyov rcar_gen3_phy_pcie_modify_reg(p, PHY_CTRL, PHY_CTRL_PHY_PWDN, 0);
492ce7f2f4SSergei Shtylyov
502ce7f2f4SSergei Shtylyov return 0;
512ce7f2f4SSergei Shtylyov }
522ce7f2f4SSergei Shtylyov
r8a77980_phy_pcie_power_off(struct phy * p)532ce7f2f4SSergei Shtylyov static int r8a77980_phy_pcie_power_off(struct phy *p)
542ce7f2f4SSergei Shtylyov {
552ce7f2f4SSergei Shtylyov /* Power off the PCIe PHY */
562ce7f2f4SSergei Shtylyov rcar_gen3_phy_pcie_modify_reg(p, PHY_CTRL, 0, PHY_CTRL_PHY_PWDN);
572ce7f2f4SSergei Shtylyov
582ce7f2f4SSergei Shtylyov return 0;
592ce7f2f4SSergei Shtylyov }
602ce7f2f4SSergei Shtylyov
612ce7f2f4SSergei Shtylyov static const struct phy_ops r8a77980_phy_pcie_ops = {
622ce7f2f4SSergei Shtylyov .power_on = r8a77980_phy_pcie_power_on,
632ce7f2f4SSergei Shtylyov .power_off = r8a77980_phy_pcie_power_off,
642ce7f2f4SSergei Shtylyov .owner = THIS_MODULE,
652ce7f2f4SSergei Shtylyov };
662ce7f2f4SSergei Shtylyov
672ce7f2f4SSergei Shtylyov static const struct of_device_id rcar_gen3_phy_pcie_match_table[] = {
682ce7f2f4SSergei Shtylyov { .compatible = "renesas,r8a77980-pcie-phy" },
692ce7f2f4SSergei Shtylyov { }
702ce7f2f4SSergei Shtylyov };
712ce7f2f4SSergei Shtylyov MODULE_DEVICE_TABLE(of, rcar_gen3_phy_pcie_match_table);
722ce7f2f4SSergei Shtylyov
rcar_gen3_phy_pcie_probe(struct platform_device * pdev)732ce7f2f4SSergei Shtylyov static int rcar_gen3_phy_pcie_probe(struct platform_device *pdev)
742ce7f2f4SSergei Shtylyov {
752ce7f2f4SSergei Shtylyov struct device *dev = &pdev->dev;
762ce7f2f4SSergei Shtylyov struct phy_provider *provider;
772ce7f2f4SSergei Shtylyov struct rcar_gen3_phy *phy;
782ce7f2f4SSergei Shtylyov void __iomem *base;
792ce7f2f4SSergei Shtylyov int error;
802ce7f2f4SSergei Shtylyov
812ce7f2f4SSergei Shtylyov if (!dev->of_node) {
822ce7f2f4SSergei Shtylyov dev_err(dev,
832ce7f2f4SSergei Shtylyov "This driver must only be instantiated from the device tree\n");
842ce7f2f4SSergei Shtylyov return -EINVAL;
852ce7f2f4SSergei Shtylyov }
862ce7f2f4SSergei Shtylyov
870b5604afSChunfeng Yun base = devm_platform_ioremap_resource(pdev, 0);
882ce7f2f4SSergei Shtylyov if (IS_ERR(base))
892ce7f2f4SSergei Shtylyov return PTR_ERR(base);
902ce7f2f4SSergei Shtylyov
912ce7f2f4SSergei Shtylyov phy = devm_kzalloc(dev, sizeof(*phy), GFP_KERNEL);
922ce7f2f4SSergei Shtylyov if (!phy)
932ce7f2f4SSergei Shtylyov return -ENOMEM;
942ce7f2f4SSergei Shtylyov
952ce7f2f4SSergei Shtylyov spin_lock_init(&phy->lock);
962ce7f2f4SSergei Shtylyov
972ce7f2f4SSergei Shtylyov phy->base = base;
982ce7f2f4SSergei Shtylyov
992ce7f2f4SSergei Shtylyov /*
1002ce7f2f4SSergei Shtylyov * devm_phy_create() will call pm_runtime_enable(&phy->dev);
1012ce7f2f4SSergei Shtylyov * And then, phy-core will manage runtime PM for this device.
1022ce7f2f4SSergei Shtylyov */
1032ce7f2f4SSergei Shtylyov pm_runtime_enable(dev);
1042ce7f2f4SSergei Shtylyov
1052ce7f2f4SSergei Shtylyov phy->phy = devm_phy_create(dev, NULL, &r8a77980_phy_pcie_ops);
1062ce7f2f4SSergei Shtylyov if (IS_ERR(phy->phy)) {
1072ce7f2f4SSergei Shtylyov dev_err(dev, "Failed to create PCIe PHY\n");
1082ce7f2f4SSergei Shtylyov error = PTR_ERR(phy->phy);
1092ce7f2f4SSergei Shtylyov goto error;
1102ce7f2f4SSergei Shtylyov }
1112ce7f2f4SSergei Shtylyov phy_set_drvdata(phy->phy, phy);
1122ce7f2f4SSergei Shtylyov
1132ce7f2f4SSergei Shtylyov provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
1142ce7f2f4SSergei Shtylyov if (IS_ERR(provider)) {
1152ce7f2f4SSergei Shtylyov dev_err(dev, "Failed to register PHY provider\n");
1162ce7f2f4SSergei Shtylyov error = PTR_ERR(provider);
1172ce7f2f4SSergei Shtylyov goto error;
1182ce7f2f4SSergei Shtylyov }
1192ce7f2f4SSergei Shtylyov
1202ce7f2f4SSergei Shtylyov return 0;
1212ce7f2f4SSergei Shtylyov
1222ce7f2f4SSergei Shtylyov error:
1232ce7f2f4SSergei Shtylyov pm_runtime_disable(dev);
1242ce7f2f4SSergei Shtylyov
1252ce7f2f4SSergei Shtylyov return error;
1262ce7f2f4SSergei Shtylyov }
1272ce7f2f4SSergei Shtylyov
rcar_gen3_phy_pcie_remove(struct platform_device * pdev)128*aba5c6f3SUwe Kleine-König static void rcar_gen3_phy_pcie_remove(struct platform_device *pdev)
1292ce7f2f4SSergei Shtylyov {
1302ce7f2f4SSergei Shtylyov pm_runtime_disable(&pdev->dev);
1312ce7f2f4SSergei Shtylyov };
1322ce7f2f4SSergei Shtylyov
1332ce7f2f4SSergei Shtylyov static struct platform_driver rcar_gen3_phy_driver = {
1342ce7f2f4SSergei Shtylyov .driver = {
1352ce7f2f4SSergei Shtylyov .name = "phy_rcar_gen3_pcie",
1362ce7f2f4SSergei Shtylyov .of_match_table = rcar_gen3_phy_pcie_match_table,
1372ce7f2f4SSergei Shtylyov },
1382ce7f2f4SSergei Shtylyov .probe = rcar_gen3_phy_pcie_probe,
139*aba5c6f3SUwe Kleine-König .remove_new = rcar_gen3_phy_pcie_remove,
1402ce7f2f4SSergei Shtylyov };
1412ce7f2f4SSergei Shtylyov
1422ce7f2f4SSergei Shtylyov module_platform_driver(rcar_gen3_phy_driver);
1432ce7f2f4SSergei Shtylyov
1442ce7f2f4SSergei Shtylyov MODULE_LICENSE("GPL v2");
1452ce7f2f4SSergei Shtylyov MODULE_DESCRIPTION("Renesas R-Car Gen3 PCIe PHY");
1462ce7f2f4SSergei Shtylyov MODULE_AUTHOR("Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>");
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