1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * Copyright (C) 2014 Marvell Technology Group Ltd.
4  *
5  * Antoine Tenart <antoine.tenart@free-electrons.com>
6  * Jisheng Zhang <jszhang@marvell.com>
7  */
8 
9 #include <linux/io.h>
10 #include <linux/module.h>
11 #include <linux/of_device.h>
12 #include <linux/phy/phy.h>
13 #include <linux/platform_device.h>
14 #include <linux/reset.h>
15 
16 #define USB_PHY_PLL		0x04
17 #define USB_PHY_PLL_CONTROL	0x08
18 #define USB_PHY_TX_CTRL0	0x10
19 #define USB_PHY_TX_CTRL1	0x14
20 #define USB_PHY_TX_CTRL2	0x18
21 #define USB_PHY_RX_CTRL		0x20
22 #define USB_PHY_ANALOG		0x34
23 
24 /* USB_PHY_PLL */
25 #define CLK_REF_DIV(x)		((x) << 4)
26 #define FEEDBACK_CLK_DIV(x)	((x) << 8)
27 
28 /* USB_PHY_PLL_CONTROL */
29 #define CLK_STABLE		BIT(0)
30 #define PLL_CTRL_PIN		BIT(1)
31 #define PLL_CTRL_REG		BIT(2)
32 #define PLL_ON			BIT(3)
33 #define PHASE_OFF_TOL_125	(0x0 << 5)
34 #define PHASE_OFF_TOL_250	BIT(5)
35 #define KVC0_CALIB		(0x0 << 9)
36 #define KVC0_REG_CTRL		BIT(9)
37 #define KVC0_HIGH		(0x0 << 10)
38 #define KVC0_LOW		(0x3 << 10)
39 #define CLK_BLK_EN		BIT(13)
40 
41 /* USB_PHY_TX_CTRL0 */
42 #define EXT_HS_RCAL_EN		BIT(3)
43 #define EXT_FS_RCAL_EN		BIT(4)
44 #define IMPCAL_VTH_DIV(x)	((x) << 5)
45 #define EXT_RS_RCAL_DIV(x)	((x) << 8)
46 #define EXT_FS_RCAL_DIV(x)	((x) << 12)
47 
48 /* USB_PHY_TX_CTRL1 */
49 #define TX_VDD15_14		(0x0 << 4)
50 #define TX_VDD15_15		BIT(4)
51 #define TX_VDD15_16		(0x2 << 4)
52 #define TX_VDD15_17		(0x3 << 4)
53 #define TX_VDD12_VDD		(0x0 << 6)
54 #define TX_VDD12_11		BIT(6)
55 #define TX_VDD12_12		(0x2 << 6)
56 #define TX_VDD12_13		(0x3 << 6)
57 #define LOW_VDD_EN		BIT(8)
58 #define TX_OUT_AMP(x)		((x) << 9)
59 
60 /* USB_PHY_TX_CTRL2 */
61 #define TX_CHAN_CTRL_REG(x)	((x) << 0)
62 #define DRV_SLEWRATE(x)		((x) << 4)
63 #define IMP_CAL_FS_HS_DLY_0	(0x0 << 6)
64 #define IMP_CAL_FS_HS_DLY_1	BIT(6)
65 #define IMP_CAL_FS_HS_DLY_2	(0x2 << 6)
66 #define IMP_CAL_FS_HS_DLY_3	(0x3 << 6)
67 #define FS_DRV_EN_MASK(x)	((x) << 8)
68 #define HS_DRV_EN_MASK(x)	((x) << 12)
69 
70 /* USB_PHY_RX_CTRL */
71 #define PHASE_FREEZE_DLY_2_CL	(0x0 << 0)
72 #define PHASE_FREEZE_DLY_4_CL	BIT(0)
73 #define ACK_LENGTH_8_CL		(0x0 << 2)
74 #define ACK_LENGTH_12_CL	BIT(2)
75 #define ACK_LENGTH_16_CL	(0x2 << 2)
76 #define ACK_LENGTH_20_CL	(0x3 << 2)
77 #define SQ_LENGTH_3		(0x0 << 4)
78 #define SQ_LENGTH_6		BIT(4)
79 #define SQ_LENGTH_9		(0x2 << 4)
80 #define SQ_LENGTH_12		(0x3 << 4)
81 #define DISCON_THRESHOLD_260	(0x0 << 6)
82 #define DISCON_THRESHOLD_270	BIT(6)
83 #define DISCON_THRESHOLD_280	(0x2 << 6)
84 #define DISCON_THRESHOLD_290	(0x3 << 6)
85 #define SQ_THRESHOLD(x)		((x) << 8)
86 #define LPF_COEF(x)		((x) << 12)
87 #define INTPL_CUR_10		(0x0 << 14)
88 #define INTPL_CUR_20		BIT(14)
89 #define INTPL_CUR_30		(0x2 << 14)
90 #define INTPL_CUR_40		(0x3 << 14)
91 
92 /* USB_PHY_ANALOG */
93 #define ANA_PWR_UP		BIT(1)
94 #define ANA_PWR_DOWN		BIT(2)
95 #define V2I_VCO_RATIO(x)	((x) << 7)
96 #define R_ROTATE_90		(0x0 << 10)
97 #define R_ROTATE_0		BIT(10)
98 #define MODE_TEST_EN		BIT(11)
99 #define ANA_TEST_DC_CTRL(x)	((x) << 12)
100 
101 static const u32 phy_berlin_pll_dividers[] = {
102 	/* Berlin 2 */
103 	CLK_REF_DIV(0x6) | FEEDBACK_CLK_DIV(0x55),
104 	/* Berlin 2CD/Q */
105 	CLK_REF_DIV(0xc) | FEEDBACK_CLK_DIV(0x54),
106 };
107 
108 struct phy_berlin_usb_priv {
109 	void __iomem		*base;
110 	struct reset_control	*rst_ctrl;
111 	u32			pll_divider;
112 };
113 
114 static int phy_berlin_usb_power_on(struct phy *phy)
115 {
116 	struct phy_berlin_usb_priv *priv = phy_get_drvdata(phy);
117 
118 	reset_control_reset(priv->rst_ctrl);
119 
120 	writel(priv->pll_divider,
121 	       priv->base + USB_PHY_PLL);
122 	writel(CLK_STABLE | PLL_CTRL_REG | PHASE_OFF_TOL_250 | KVC0_REG_CTRL |
123 	       CLK_BLK_EN, priv->base + USB_PHY_PLL_CONTROL);
124 	writel(V2I_VCO_RATIO(0x5) | R_ROTATE_0 | ANA_TEST_DC_CTRL(0x5),
125 	       priv->base + USB_PHY_ANALOG);
126 	writel(PHASE_FREEZE_DLY_4_CL | ACK_LENGTH_16_CL | SQ_LENGTH_12 |
127 	       DISCON_THRESHOLD_270 | SQ_THRESHOLD(0xa) | LPF_COEF(0x2) |
128 	       INTPL_CUR_30, priv->base + USB_PHY_RX_CTRL);
129 
130 	writel(TX_VDD12_13 | TX_OUT_AMP(0x3), priv->base + USB_PHY_TX_CTRL1);
131 	writel(EXT_HS_RCAL_EN | IMPCAL_VTH_DIV(0x3) | EXT_RS_RCAL_DIV(0x4),
132 	       priv->base + USB_PHY_TX_CTRL0);
133 
134 	writel(EXT_HS_RCAL_EN | IMPCAL_VTH_DIV(0x3) | EXT_RS_RCAL_DIV(0x4) |
135 	       EXT_FS_RCAL_DIV(0x2), priv->base + USB_PHY_TX_CTRL0);
136 
137 	writel(EXT_HS_RCAL_EN | IMPCAL_VTH_DIV(0x3) | EXT_RS_RCAL_DIV(0x4),
138 	       priv->base + USB_PHY_TX_CTRL0);
139 	writel(TX_CHAN_CTRL_REG(0xf) | DRV_SLEWRATE(0x3) | IMP_CAL_FS_HS_DLY_3 |
140 	       FS_DRV_EN_MASK(0xd), priv->base + USB_PHY_TX_CTRL2);
141 
142 	return 0;
143 }
144 
145 static const struct phy_ops phy_berlin_usb_ops = {
146 	.power_on	= phy_berlin_usb_power_on,
147 	.owner		= THIS_MODULE,
148 };
149 
150 static const struct of_device_id phy_berlin_usb_of_match[] = {
151 	{
152 		.compatible = "marvell,berlin2-usb-phy",
153 		.data = &phy_berlin_pll_dividers[0],
154 	},
155 	{
156 		.compatible = "marvell,berlin2cd-usb-phy",
157 		.data = &phy_berlin_pll_dividers[1],
158 	},
159 	{ },
160 };
161 MODULE_DEVICE_TABLE(of, phy_berlin_usb_of_match);
162 
163 static int phy_berlin_usb_probe(struct platform_device *pdev)
164 {
165 	const struct of_device_id *match =
166 		of_match_device(phy_berlin_usb_of_match, &pdev->dev);
167 	struct phy_berlin_usb_priv *priv;
168 	struct phy *phy;
169 	struct phy_provider *phy_provider;
170 
171 	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
172 	if (!priv)
173 		return -ENOMEM;
174 
175 	priv->base = devm_platform_ioremap_resource(pdev, 0);
176 	if (IS_ERR(priv->base))
177 		return PTR_ERR(priv->base);
178 
179 	priv->rst_ctrl = devm_reset_control_get(&pdev->dev, NULL);
180 	if (IS_ERR(priv->rst_ctrl))
181 		return PTR_ERR(priv->rst_ctrl);
182 
183 	priv->pll_divider = *((u32 *)match->data);
184 
185 	phy = devm_phy_create(&pdev->dev, NULL, &phy_berlin_usb_ops);
186 	if (IS_ERR(phy)) {
187 		dev_err(&pdev->dev, "failed to create PHY\n");
188 		return PTR_ERR(phy);
189 	}
190 
191 	phy_set_drvdata(phy, priv);
192 
193 	phy_provider =
194 		devm_of_phy_provider_register(&pdev->dev, of_phy_simple_xlate);
195 	return PTR_ERR_OR_ZERO(phy_provider);
196 }
197 
198 static struct platform_driver phy_berlin_usb_driver = {
199 	.probe	= phy_berlin_usb_probe,
200 	.driver	= {
201 		.name		= "phy-berlin-usb",
202 		.of_match_table	= phy_berlin_usb_of_match,
203 	},
204 };
205 module_platform_driver(phy_berlin_usb_driver);
206 
207 MODULE_AUTHOR("Antoine Tenart <antoine.tenart@free-electrons.com>");
208 MODULE_DESCRIPTION("Marvell Berlin PHY driver for USB");
209 MODULE_LICENSE("GPL");
210