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 /* USB General control register 2 (UGCTRL2), bit[31:6] should be 0 */
24 #define UGCTRL2_RESERVED_3	0x00000001	/* bit[3:0] should be B'0001 */
25 #define UGCTRL2_USB0SEL_OTG	0x00000030
26 
27 static void usbhs_write32(struct usbhs_priv *priv, u32 reg, u32 data)
28 {
29 	iowrite32(data, priv->base + reg);
30 }
31 
32 static int usbhs_rcar3_power_ctrl(struct platform_device *pdev,
33 				void __iomem *base, int enable)
34 {
35 	struct usbhs_priv *priv = usbhs_pdev_to_priv(pdev);
36 
37 	usbhs_write32(priv, UGCTRL2, UGCTRL2_RESERVED_3 | UGCTRL2_USB0SEL_OTG);
38 
39 	if (enable) {
40 		usbhs_bset(priv, LPSTS, LPSTS_SUSPM, LPSTS_SUSPM);
41 		/* The controller on R-Car Gen3 needs to wait up to 45 usec */
42 		udelay(45);
43 	} else {
44 		usbhs_bset(priv, LPSTS, LPSTS_SUSPM, 0);
45 	}
46 
47 	return 0;
48 }
49 
50 static int usbhs_rcar3_get_id(struct platform_device *pdev)
51 {
52 	return USBHS_GADGET;
53 }
54 
55 const struct renesas_usbhs_platform_callback usbhs_rcar3_ops = {
56 	.power_ctrl = usbhs_rcar3_power_ctrl,
57 	.get_id = usbhs_rcar3_get_id,
58 };
59