1 /*
2  * Renesas USB driver R-Car Gen. 3 initialization and power control
3  *
4  * Copyright (C) 2016 Renesas Electronics Corporation
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License version 2 as
8  * published by the Free Software Foundation.
9  *
10  */
11 
12 #include <linux/delay.h>
13 #include <linux/io.h>
14 #include "common.h"
15 #include "rcar3.h"
16 
17 #define LPSTS		0x102
18 #define UGCTRL2		0x184	/* 32-bit register */
19 
20 /* Low Power Status register (LPSTS) */
21 #define LPSTS_SUSPM	0x4000
22 
23 /*
24  * USB General control register 2 (UGCTRL2)
25  * Remarks: bit[31:11] and bit[9:6] should be 0
26  */
27 #define UGCTRL2_RESERVED_3	0x00000001	/* bit[3:0] should be B'0001 */
28 #define UGCTRL2_USB0SEL_OTG	0x00000030
29 #define UGCTRL2_VBUSSEL		0x00000400
30 
31 static void usbhs_write32(struct usbhs_priv *priv, u32 reg, u32 data)
32 {
33 	iowrite32(data, priv->base + reg);
34 }
35 
36 static int usbhs_rcar3_power_ctrl(struct platform_device *pdev,
37 				void __iomem *base, int enable)
38 {
39 	struct usbhs_priv *priv = usbhs_pdev_to_priv(pdev);
40 
41 	usbhs_write32(priv, UGCTRL2, UGCTRL2_RESERVED_3 | UGCTRL2_USB0SEL_OTG |
42 		      UGCTRL2_VBUSSEL);
43 
44 	if (enable) {
45 		usbhs_bset(priv, LPSTS, LPSTS_SUSPM, LPSTS_SUSPM);
46 		/* The controller on R-Car Gen3 needs to wait up to 45 usec */
47 		udelay(45);
48 	} else {
49 		usbhs_bset(priv, LPSTS, LPSTS_SUSPM, 0);
50 	}
51 
52 	return 0;
53 }
54 
55 static int usbhs_rcar3_get_id(struct platform_device *pdev)
56 {
57 	return USBHS_GADGET;
58 }
59 
60 const struct renesas_usbhs_platform_callback usbhs_rcar3_ops = {
61 	.power_ctrl = usbhs_rcar3_power_ctrl,
62 	.get_id = usbhs_rcar3_get_id,
63 };
64