1 // SPDX-License-Identifier: GPL-2.0-only
8 #include <linux/phy/phy.h>
11 #define PCIE_CFG_OFFSET         0x00
16 	CYGNUS_PHY_PCIE0 = 0,
24  * struct cygnus_pcie_phy - Cygnus PCIe PHY device
25  * @core: pointer to the Cygnus PCIe PHY core control
26  * @id: internal ID to identify the Cygnus PCIe PHY
27  * @phy: pointer to the kernel PHY device
32 	struct phy *phy;  member
36  * struct cygnus_pcie_phy_core - Cygnus PCIe PHY core control
40  * @phys: pointer to Cygnus PHY device
49 static int cygnus_pcie_power_config(struct cygnus_pcie_phy *phy, bool enable)  in cygnus_pcie_power_config()  argument
51 	struct cygnus_pcie_phy_core *core = phy->core;  in cygnus_pcie_power_config()
55 	mutex_lock(&core->lock);  in cygnus_pcie_power_config()
57 	switch (phy->id) {  in cygnus_pcie_power_config()
67 		mutex_unlock(&core->lock);  in cygnus_pcie_power_config()
68 		dev_err(core->dev, "PCIe PHY %d invalid\n", phy->id);  in cygnus_pcie_power_config()
69 		return -EINVAL;  in cygnus_pcie_power_config()
73 		val = readl(core->base + PCIE_CFG_OFFSET);  in cygnus_pcie_power_config()
75 		writel(val, core->base + PCIE_CFG_OFFSET);  in cygnus_pcie_power_config()
77 		 * Wait 50 ms for the PCIe Serdes to stabilize after the analog  in cygnus_pcie_power_config()
82 		val = readl(core->base + PCIE_CFG_OFFSET);  in cygnus_pcie_power_config()
84 		writel(val, core->base + PCIE_CFG_OFFSET);  in cygnus_pcie_power_config()
87 	mutex_unlock(&core->lock);  in cygnus_pcie_power_config()
88 	dev_dbg(core->dev, "PCIe PHY %d %s\n", phy->id,  in cygnus_pcie_power_config()
90 	return 0;  in cygnus_pcie_power_config()
93 static int cygnus_pcie_phy_power_on(struct phy *p)  in cygnus_pcie_phy_power_on()
95 	struct cygnus_pcie_phy *phy = phy_get_drvdata(p);  in cygnus_pcie_phy_power_on()  local
97 	return cygnus_pcie_power_config(phy, true);  in cygnus_pcie_phy_power_on()
100 static int cygnus_pcie_phy_power_off(struct phy *p)  in cygnus_pcie_phy_power_off()
102 	struct cygnus_pcie_phy *phy = phy_get_drvdata(p);  in cygnus_pcie_phy_power_off()  local
104 	return cygnus_pcie_power_config(phy, false);  in cygnus_pcie_phy_power_off()
115 	struct device *dev = &pdev->dev;  in cygnus_pcie_phy_probe()
116 	struct device_node *node = dev->of_node;  in cygnus_pcie_phy_probe()
119 	unsigned cnt = 0;  in cygnus_pcie_phy_probe()
121 	if (of_get_child_count(node) == 0) {  in cygnus_pcie_phy_probe()
122 		dev_err(dev, "PHY no child node\n");  in cygnus_pcie_phy_probe()
123 		return -ENODEV;  in cygnus_pcie_phy_probe()
128 		return -ENOMEM;  in cygnus_pcie_phy_probe()
130 	core->dev = dev;  in cygnus_pcie_phy_probe()
132 	core->base = devm_platform_ioremap_resource(pdev, 0);  in cygnus_pcie_phy_probe()
133 	if (IS_ERR(core->base))  in cygnus_pcie_phy_probe()
134 		return PTR_ERR(core->base);  in cygnus_pcie_phy_probe()
136 	mutex_init(&core->lock);  in cygnus_pcie_phy_probe()
145 			return -EINVAL;  in cygnus_pcie_phy_probe()
149 			dev_err(dev, "invalid PHY id: %u\n", id);  in cygnus_pcie_phy_probe()
150 			return -EINVAL;  in cygnus_pcie_phy_probe()
153 		if (core->phys[id].phy) {  in cygnus_pcie_phy_probe()
154 			dev_err(dev, "duplicated PHY id: %u\n", id);  in cygnus_pcie_phy_probe()
155 			return -EINVAL;  in cygnus_pcie_phy_probe()
158 		p = &core->phys[id];  in cygnus_pcie_phy_probe()
159 		p->phy = devm_phy_create(dev, child, &cygnus_pcie_phy_ops);  in cygnus_pcie_phy_probe()
160 		if (IS_ERR(p->phy)) {  in cygnus_pcie_phy_probe()
161 			dev_err(dev, "failed to create PHY\n");  in cygnus_pcie_phy_probe()
162 			return PTR_ERR(p->phy);  in cygnus_pcie_phy_probe()
165 		p->core = core;  in cygnus_pcie_phy_probe()
166 		p->id = id;  in cygnus_pcie_phy_probe()
167 		phy_set_drvdata(p->phy, p);  in cygnus_pcie_phy_probe()
175 		dev_err(dev, "failed to register PHY provider\n");  in cygnus_pcie_phy_probe()
179 	dev_dbg(dev, "registered %u PCIe PHY(s)\n", cnt);  in cygnus_pcie_phy_probe()
181 	return 0;  in cygnus_pcie_phy_probe()
185 	{ .compatible = "brcm,cygnus-pcie-phy" },
192 		.name = "cygnus-pcie-phy",
200 MODULE_DESCRIPTION("Broadcom Cygnus PCIe PHY driver");