1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * Copyright (c) 2014-2023, The Linux Foundation. All rights reserved.
4  */
5 
6 #include <linux/clk.h>
7 #include <linux/delay.h>
8 #include <linux/err.h>
9 #include <linux/io.h>
10 #include <linux/kernel.h>
11 #include <linux/module.h>
12 #include <linux/of.h>
13 #include <linux/phy/phy.h>
14 #include <linux/platform_device.h>
15 #include <linux/reset.h>
16 #include <linux/slab.h>
17 
18 #define USB2PHY_PORT_UTMI_CTRL1		0x40
19 
20 #define USB2PHY_PORT_UTMI_CTRL2		0x44
21  #define UTMI_ULPI_SEL			BIT(7)
22  #define UTMI_TEST_MUX_SEL		BIT(6)
23 
24 #define HS_PHY_CTRL_REG			0x10
25  #define UTMI_OTG_VBUS_VALID		BIT(20)
26  #define SW_SESSVLD_SEL			BIT(28)
27 
28 #define USB_PHY_UTMI_CTRL0		0x3c
29 
30 #define USB_PHY_UTMI_CTRL5		0x50
31  #define POR_EN				BIT(1)
32 
33 #define USB_PHY_HS_PHY_CTRL_COMMON0	0x54
34  #define COMMONONN			BIT(7)
35  #define FSEL				BIT(4)
36  #define RETENABLEN			BIT(3)
37  #define FREQ_24MHZ			(BIT(6) | BIT(4))
38 
39 #define USB_PHY_HS_PHY_CTRL2		0x64
40  #define USB2_SUSPEND_N_SEL		BIT(3)
41  #define USB2_SUSPEND_N			BIT(2)
42  #define USB2_UTMI_CLK_EN		BIT(1)
43 
44 #define USB_PHY_CFG0			0x94
45  #define UTMI_PHY_OVERRIDE_EN		BIT(1)
46 
47 #define USB_PHY_REFCLK_CTRL		0xa0
48  #define CLKCORE			BIT(1)
49 
50 #define USB2PHY_PORT_POWERDOWN		0xa4
51  #define POWER_UP			BIT(0)
52  #define POWER_DOWN			0
53 
54 #define USB_PHY_FSEL_SEL		0xb8
55  #define FREQ_SEL			BIT(0)
56 
57 #define USB2PHY_USB_PHY_M31_XCFGI_1	0xbc
58  #define USB2_0_TX_ENABLE		BIT(2)
59 
60 #define USB2PHY_USB_PHY_M31_XCFGI_4	0xc8
61  #define HSTX_SLEW_RATE_565PS		GENMASK(1, 0)
62  #define PLL_CHARGING_PUMP_CURRENT_35UA	GENMASK(4, 3)
63  #define ODT_VALUE_38_02_OHM		GENMASK(7, 6)
64 
65 #define USB2PHY_USB_PHY_M31_XCFGI_5	0xcc
66  #define ODT_VALUE_45_02_OHM		BIT(2)
67  #define HSTX_PRE_EMPHASIS_LEVEL_0_55MA	BIT(0)
68 
69 #define USB2PHY_USB_PHY_M31_XCFGI_11	0xe4
70  #define XCFG_COARSE_TUNE_NUM		BIT(1)
71  #define XCFG_FINE_TUNE_NUM		BIT(3)
72 
73 struct m31_phy_regs {
74 	u32 off;
75 	u32 val;
76 	u32 delay;
77 };
78 
79 struct m31_priv_data {
80 	bool				ulpi_mode;
81 	const struct m31_phy_regs	*regs;
82 	unsigned int			nregs;
83 };
84 
85 static struct m31_phy_regs m31_ipq5332_regs[] = {
86 	{
87 		USB_PHY_CFG0,
88 		UTMI_PHY_OVERRIDE_EN,
89 		0
90 	},
91 	{
92 		USB_PHY_UTMI_CTRL5,
93 		POR_EN,
94 		15
95 	},
96 	{
97 		USB_PHY_FSEL_SEL,
98 		FREQ_SEL,
99 		0
100 	},
101 	{
102 		USB_PHY_HS_PHY_CTRL_COMMON0,
103 		COMMONONN | FREQ_24MHZ | RETENABLEN,
104 		0
105 	},
106 	{
107 		USB_PHY_UTMI_CTRL5,
108 		POR_EN,
109 		0
110 	},
111 	{
112 		USB_PHY_HS_PHY_CTRL2,
113 		USB2_SUSPEND_N_SEL | USB2_SUSPEND_N | USB2_UTMI_CLK_EN,
114 		0
115 	},
116 	{
117 		USB2PHY_USB_PHY_M31_XCFGI_11,
118 		XCFG_COARSE_TUNE_NUM  | XCFG_FINE_TUNE_NUM,
119 		0
120 	},
121 	{
122 		USB2PHY_USB_PHY_M31_XCFGI_4,
123 		HSTX_SLEW_RATE_565PS | PLL_CHARGING_PUMP_CURRENT_35UA | ODT_VALUE_38_02_OHM,
124 		0
125 	},
126 	{
127 		USB2PHY_USB_PHY_M31_XCFGI_1,
128 		USB2_0_TX_ENABLE,
129 		0
130 	},
131 	{
132 		USB2PHY_USB_PHY_M31_XCFGI_5,
133 		ODT_VALUE_45_02_OHM | HSTX_PRE_EMPHASIS_LEVEL_0_55MA,
134 		4
135 	},
136 	{
137 		USB_PHY_UTMI_CTRL5,
138 		0x0,
139 		0
140 	},
141 	{
142 		USB_PHY_HS_PHY_CTRL2,
143 		USB2_SUSPEND_N | USB2_UTMI_CLK_EN,
144 		0
145 	},
146 };
147 
148 struct m31usb_phy {
149 	struct phy			*phy;
150 	void __iomem			*base;
151 	const struct m31_phy_regs	*regs;
152 	int				nregs;
153 
154 	struct regulator		*vreg;
155 	struct clk			*clk;
156 	struct reset_control		*reset;
157 
158 	bool				ulpi_mode;
159 };
160 
m31usb_phy_init(struct phy * phy)161 static int m31usb_phy_init(struct phy *phy)
162 {
163 	struct m31usb_phy *qphy = phy_get_drvdata(phy);
164 	const struct m31_phy_regs *regs = qphy->regs;
165 	int i, ret;
166 
167 	ret = regulator_enable(qphy->vreg);
168 	if (ret) {
169 		dev_err(&phy->dev, "failed to enable regulator, %d\n", ret);
170 		return ret;
171 	}
172 
173 	ret = clk_prepare_enable(qphy->clk);
174 	if (ret) {
175 		regulator_disable(qphy->vreg);
176 		dev_err(&phy->dev, "failed to enable cfg ahb clock, %d\n", ret);
177 		return ret;
178 	}
179 
180 	/* Perform phy reset */
181 	reset_control_assert(qphy->reset);
182 	udelay(5);
183 	reset_control_deassert(qphy->reset);
184 
185 	/* configure for ULPI mode if requested */
186 	if (qphy->ulpi_mode)
187 		writel(0x0, qphy->base + USB2PHY_PORT_UTMI_CTRL2);
188 
189 	/* Enable the PHY */
190 	writel(POWER_UP, qphy->base + USB2PHY_PORT_POWERDOWN);
191 
192 	/* Turn on phy ref clock */
193 	for (i = 0; i < qphy->nregs; i++) {
194 		writel(regs[i].val, qphy->base + regs[i].off);
195 		if (regs[i].delay)
196 			udelay(regs[i].delay);
197 	}
198 
199 	return 0;
200 }
201 
m31usb_phy_shutdown(struct phy * phy)202 static int m31usb_phy_shutdown(struct phy *phy)
203 {
204 	struct m31usb_phy *qphy = phy_get_drvdata(phy);
205 
206 	/* Disable the PHY */
207 	writel_relaxed(POWER_DOWN, qphy->base + USB2PHY_PORT_POWERDOWN);
208 
209 	clk_disable_unprepare(qphy->clk);
210 
211 	regulator_disable(qphy->vreg);
212 
213 	return 0;
214 }
215 
216 static const struct phy_ops m31usb_phy_gen_ops = {
217 	.power_on	= m31usb_phy_init,
218 	.power_off	= m31usb_phy_shutdown,
219 	.owner		= THIS_MODULE,
220 };
221 
m31usb_phy_probe(struct platform_device * pdev)222 static int m31usb_phy_probe(struct platform_device *pdev)
223 {
224 	struct phy_provider *phy_provider;
225 	const struct m31_priv_data *data;
226 	struct device *dev = &pdev->dev;
227 	struct m31usb_phy *qphy;
228 
229 	qphy = devm_kzalloc(dev, sizeof(*qphy), GFP_KERNEL);
230 	if (!qphy)
231 		return -ENOMEM;
232 
233 	qphy->base = devm_platform_ioremap_resource(pdev, 0);
234 	if (IS_ERR(qphy->base))
235 		return PTR_ERR(qphy->base);
236 
237 	qphy->reset = devm_reset_control_get_exclusive_by_index(dev, 0);
238 	if (IS_ERR(qphy->reset))
239 		return PTR_ERR(qphy->reset);
240 
241 	qphy->clk = devm_clk_get(dev, NULL);
242 	if (IS_ERR(qphy->clk))
243 		return dev_err_probe(dev, PTR_ERR(qphy->clk),
244 						"failed to get clk\n");
245 
246 	data = of_device_get_match_data(dev);
247 	qphy->regs		= data->regs;
248 	qphy->nregs		= data->nregs;
249 	qphy->ulpi_mode		= data->ulpi_mode;
250 
251 	qphy->phy = devm_phy_create(dev, NULL, &m31usb_phy_gen_ops);
252 	if (IS_ERR(qphy->phy))
253 		return dev_err_probe(dev, PTR_ERR(qphy->phy),
254 						"failed to create phy\n");
255 
256 	qphy->vreg = devm_regulator_get(dev, "vdd");
257 	if (IS_ERR(qphy->vreg))
258 		return dev_err_probe(dev, PTR_ERR(qphy->vreg),
259 						"failed to get vreg\n");
260 
261 	phy_set_drvdata(qphy->phy, qphy);
262 
263 	phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
264 	if (!IS_ERR(phy_provider))
265 		dev_info(dev, "Registered M31 USB phy\n");
266 
267 	return PTR_ERR_OR_ZERO(phy_provider);
268 }
269 
270 static const struct m31_priv_data m31_ipq5332_data = {
271 	.ulpi_mode = false,
272 	.regs = m31_ipq5332_regs,
273 	.nregs = ARRAY_SIZE(m31_ipq5332_regs),
274 };
275 
276 static const struct of_device_id m31usb_phy_id_table[] = {
277 	{ .compatible = "qcom,ipq5332-usb-hsphy", .data = &m31_ipq5332_data },
278 	{ },
279 };
280 MODULE_DEVICE_TABLE(of, m31usb_phy_id_table);
281 
282 static struct platform_driver m31usb_phy_driver = {
283 	.probe = m31usb_phy_probe,
284 	.driver = {
285 		.name = "qcom-m31usb-phy",
286 		.of_match_table = m31usb_phy_id_table,
287 	},
288 };
289 
290 module_platform_driver(m31usb_phy_driver);
291 
292 MODULE_DESCRIPTION("USB2 Qualcomm M31 HSPHY driver");
293 MODULE_LICENSE("GPL");
294