1 // SPDX-License-Identifier: GPL-2.0-only
3  * Broadcom Northstar USB 2.0 PHY Driver
16 #include <linux/phy/phy.h>
24 	struct phy *phy;  member
32 static int bcm_ns_usb2_phy_init(struct phy *phy)  in bcm_ns_usb2_phy_init()  argument
34 	struct bcm_ns_usb2 *usb2 = phy_get_drvdata(phy);  in bcm_ns_usb2_phy_init()  local
35 	struct device *dev = usb2->dev;  in bcm_ns_usb2_phy_init()
39 	err = clk_prepare_enable(usb2->ref_clk);  in bcm_ns_usb2_phy_init()
45 	ref_clk_rate = clk_get_rate(usb2->ref_clk);  in bcm_ns_usb2_phy_init()
48 		err = -EINVAL;  in bcm_ns_usb2_phy_init()
52 	if (usb2->base)  in bcm_ns_usb2_phy_init()
53 		usb2ctl = readl(usb2->base);  in bcm_ns_usb2_phy_init()
55 		usb2ctl = readl(usb2->dmu + BCMA_DMU_CRU_USB2_CONTROL);  in bcm_ns_usb2_phy_init()
65 	/* Calculate ndiv based on a solid 1920 MHz that is for USB2 PHY */  in bcm_ns_usb2_phy_init()
69 	if (usb2->clkset)  in bcm_ns_usb2_phy_init()
70 		regmap_write(usb2->clkset, 0, 0x0000ea68);  in bcm_ns_usb2_phy_init()
72 		writel(0x0000ea68, usb2->dmu + BCMA_DMU_CRU_CLKSET_KEY);  in bcm_ns_usb2_phy_init()
77 	if (usb2->base)  in bcm_ns_usb2_phy_init()
78 		writel(usb2ctl, usb2->base);  in bcm_ns_usb2_phy_init()
80 		writel(usb2ctl, usb2->dmu + BCMA_DMU_CRU_USB2_CONTROL);  in bcm_ns_usb2_phy_init()
83 	if (usb2->clkset)  in bcm_ns_usb2_phy_init()
84 		regmap_write(usb2->clkset, 0, 0x00000000);  in bcm_ns_usb2_phy_init()
86 		writel(0x00000000, usb2->dmu + BCMA_DMU_CRU_CLKSET_KEY);  in bcm_ns_usb2_phy_init()
89 	clk_disable_unprepare(usb2->ref_clk);  in bcm_ns_usb2_phy_init()
101 	struct device *dev = &pdev->dev;  in bcm_ns_usb2_probe()
102 	struct bcm_ns_usb2 *usb2;  in bcm_ns_usb2_probe()  local
105 	usb2 = devm_kzalloc(&pdev->dev, sizeof(*usb2), GFP_KERNEL);  in bcm_ns_usb2_probe()
106 	if (!usb2)  in bcm_ns_usb2_probe()
107 		return -ENOMEM;  in bcm_ns_usb2_probe()
108 	usb2->dev = dev;  in bcm_ns_usb2_probe()
110 	if (of_property_present(dev->of_node, "brcm,syscon-clkset")) {  in bcm_ns_usb2_probe()
111 		usb2->base = devm_platform_ioremap_resource(pdev, 0);  in bcm_ns_usb2_probe()
112 		if (IS_ERR(usb2->base)) {  in bcm_ns_usb2_probe()
114 			return PTR_ERR(usb2->base);  in bcm_ns_usb2_probe()
117 		usb2->clkset = syscon_regmap_lookup_by_phandle(dev->of_node,  in bcm_ns_usb2_probe()
118 							       "brcm,syscon-clkset");  in bcm_ns_usb2_probe()
119 		if (IS_ERR(usb2->clkset)) {  in bcm_ns_usb2_probe()
121 			return PTR_ERR(usb2->clkset);  in bcm_ns_usb2_probe()
124 		usb2->dmu = devm_platform_ioremap_resource_byname(pdev, "dmu");  in bcm_ns_usb2_probe()
125 		if (IS_ERR(usb2->dmu)) {  in bcm_ns_usb2_probe()
127 			return PTR_ERR(usb2->dmu);  in bcm_ns_usb2_probe()
133 	usb2->ref_clk = devm_clk_get(dev, "phy-ref-clk");  in bcm_ns_usb2_probe()
134 	if (IS_ERR(usb2->ref_clk)) {  in bcm_ns_usb2_probe()
135 		dev_err_probe(dev, PTR_ERR(usb2->ref_clk), "failed to get ref clk\n");  in bcm_ns_usb2_probe()
136 		return PTR_ERR(usb2->ref_clk);  in bcm_ns_usb2_probe()
139 	usb2->phy = devm_phy_create(dev, NULL, &ops);  in bcm_ns_usb2_probe()
140 	if (IS_ERR(usb2->phy))  in bcm_ns_usb2_probe()
141 		return PTR_ERR(usb2->phy);  in bcm_ns_usb2_probe()
143 	phy_set_drvdata(usb2->phy, usb2);  in bcm_ns_usb2_probe()
144 	platform_set_drvdata(pdev, usb2);  in bcm_ns_usb2_probe()
151 	{ .compatible = "brcm,ns-usb2-phy", },
165 MODULE_DESCRIPTION("Broadcom Northstar USB 2.0 PHY Driver");