1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Renesas USB driver R-Car Gen. 3 initialization and power control
4 *
5 * Copyright (C) 2016 Renesas Electronics Corporation
6 */
7
8 #include <linux/delay.h>
9 #include <linux/io.h>
10 #include "common.h"
11 #include "rcar3.h"
12
13 #define LPSTS 0x102
14 #define UGCTRL 0x180 /* 32-bit register */
15 #define UGCTRL2 0x184 /* 32-bit register */
16 #define UGSTS 0x188 /* 32-bit register */
17
18 /* Low Power Status register (LPSTS) */
19 #define LPSTS_SUSPM 0x4000
20
21 /* R-Car D3 only: USB General control register (UGCTRL) */
22 #define UGCTRL_PLLRESET 0x00000001
23 #define UGCTRL_CONNECT 0x00000004
24
25 /*
26 * USB General control register 2 (UGCTRL2)
27 * Remarks: bit[31:11] and bit[9:6] should be 0
28 */
29 #define UGCTRL2_RESERVED_3 0x00000001 /* bit[3:0] should be B'0001 */
30 #define UGCTRL2_USB0SEL_EHCI 0x00000010
31 #define UGCTRL2_USB0SEL_HSUSB 0x00000020
32 #define UGCTRL2_USB0SEL_OTG 0x00000030
33 #define UGCTRL2_VBUSSEL 0x00000400
34
35 /* R-Car D3 only: USB General status register (UGSTS) */
36 #define UGSTS_LOCK 0x00000100
37
usbhs_write32(struct usbhs_priv * priv,u32 reg,u32 data)38 static void usbhs_write32(struct usbhs_priv *priv, u32 reg, u32 data)
39 {
40 iowrite32(data, priv->base + reg);
41 }
42
usbhs_read32(struct usbhs_priv * priv,u32 reg)43 static u32 usbhs_read32(struct usbhs_priv *priv, u32 reg)
44 {
45 return ioread32(priv->base + reg);
46 }
47
usbhs_rcar3_set_ugctrl2(struct usbhs_priv * priv,u32 val)48 static void usbhs_rcar3_set_ugctrl2(struct usbhs_priv *priv, u32 val)
49 {
50 usbhs_write32(priv, UGCTRL2, val | UGCTRL2_RESERVED_3);
51 }
52
usbhs_rcar3_set_usbsel(struct usbhs_priv * priv,bool ehci)53 static void usbhs_rcar3_set_usbsel(struct usbhs_priv *priv, bool ehci)
54 {
55 if (ehci)
56 usbhs_rcar3_set_ugctrl2(priv, UGCTRL2_USB0SEL_EHCI);
57 else
58 usbhs_rcar3_set_ugctrl2(priv, UGCTRL2_USB0SEL_HSUSB);
59 }
60
usbhs_rcar3_power_ctrl(struct platform_device * pdev,void __iomem * base,int enable)61 static int usbhs_rcar3_power_ctrl(struct platform_device *pdev,
62 void __iomem *base, int enable)
63 {
64 struct usbhs_priv *priv = usbhs_pdev_to_priv(pdev);
65
66 usbhs_rcar3_set_ugctrl2(priv, UGCTRL2_USB0SEL_OTG | UGCTRL2_VBUSSEL);
67
68 if (enable) {
69 usbhs_bset(priv, LPSTS, LPSTS_SUSPM, LPSTS_SUSPM);
70 /* The controller on R-Car Gen3 needs to wait up to 45 usec */
71 udelay(45);
72 } else {
73 usbhs_bset(priv, LPSTS, LPSTS_SUSPM, 0);
74 }
75
76 return 0;
77 }
78
79 /* R-Car D3 needs to release UGCTRL.PLLRESET */
usbhs_rcar3_power_and_pll_ctrl(struct platform_device * pdev,void __iomem * base,int enable)80 static int usbhs_rcar3_power_and_pll_ctrl(struct platform_device *pdev,
81 void __iomem *base, int enable)
82 {
83 struct usbhs_priv *priv = usbhs_pdev_to_priv(pdev);
84 u32 val;
85 int timeout = 1000;
86 bool is_host = false;
87
88 if (enable) {
89 usbhs_write32(priv, UGCTRL, 0); /* release PLLRESET */
90 if (priv->edev)
91 is_host = extcon_get_state(priv->edev, EXTCON_USB_HOST);
92
93 usbhs_rcar3_set_usbsel(priv, is_host);
94
95 usbhs_bset(priv, LPSTS, LPSTS_SUSPM, LPSTS_SUSPM);
96 do {
97 val = usbhs_read32(priv, UGSTS);
98 udelay(1);
99 } while (!(val & UGSTS_LOCK) && timeout--);
100 usbhs_write32(priv, UGCTRL, UGCTRL_CONNECT);
101 } else {
102 usbhs_write32(priv, UGCTRL, 0);
103 usbhs_bset(priv, LPSTS, LPSTS_SUSPM, 0);
104 usbhs_write32(priv, UGCTRL, UGCTRL_PLLRESET);
105 }
106
107 return 0;
108 }
109
usbhs_rcar3_get_id(struct platform_device * pdev)110 static int usbhs_rcar3_get_id(struct platform_device *pdev)
111 {
112 return USBHS_GADGET;
113 }
114
usbhs_rcar3_notifier(struct notifier_block * nb,unsigned long event,void * data)115 static int usbhs_rcar3_notifier(struct notifier_block *nb, unsigned long event,
116 void *data)
117 {
118 struct usbhs_priv *priv = container_of(nb, struct usbhs_priv, nb);
119
120 usbhs_rcar3_set_usbsel(priv, !!event);
121
122 return NOTIFY_DONE;
123 }
124
125 const struct renesas_usbhs_platform_callback usbhs_rcar3_ops = {
126 .power_ctrl = usbhs_rcar3_power_ctrl,
127 .get_id = usbhs_rcar3_get_id,
128 };
129
130 const struct renesas_usbhs_platform_callback usbhs_rcar3_with_pll_ops = {
131 .power_ctrl = usbhs_rcar3_power_and_pll_ctrl,
132 .get_id = usbhs_rcar3_get_id,
133 .notifier = usbhs_rcar3_notifier,
134 };
135
