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
27static void usbhs_write32(struct usbhs_priv *priv, u32 reg, u32 data)
28{
29	iowrite32(data, priv->base + reg);
30}
31
32static 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
50static int usbhs_rcar3_get_id(struct platform_device *pdev)
51{
52	return USBHS_GADGET;
53}
54
55const struct renesas_usbhs_platform_callback usbhs_rcar3_ops = {
56	.power_ctrl = usbhs_rcar3_power_ctrl,
57	.get_id = usbhs_rcar3_get_id,
58};