1/*
2 * Copyright (C) 2011 Samsung Electronics Co.Ltd
3 * Author: Joonyoung Shim <jy0922.shim@samsung.com>
4 *
5 *  This program is free software; you can redistribute  it and/or modify it
6 *  under  the terms of  the GNU General  Public License as published by the
7 *  Free Software Foundation;  either version 2 of the  License, or (at your
8 *  option) any later version.
9 *
10 */
11
12#include <linux/clk.h>
13#include <linux/delay.h>
14#include <linux/err.h>
15#include <linux/io.h>
16#include <linux/platform_device.h>
17#include <mach/map.h>
18#include <plat/cpu.h>
19#include <plat/regs-usb-hsotg-phy.h>
20#include <plat/usb-phy.h>
21
22#include "regs-sys.h"
23
24static int s3c_usb_otgphy_init(struct platform_device *pdev)
25{
26	struct clk *xusbxti;
27	u32 phyclk;
28
29	writel(readl(S3C64XX_OTHERS) | S3C64XX_OTHERS_USBMASK, S3C64XX_OTHERS);
30
31	/* set clock frequency for PLL */
32	phyclk = readl(S3C_PHYCLK) & ~S3C_PHYCLK_CLKSEL_MASK;
33
34	xusbxti = clk_get(&pdev->dev, "xusbxti");
35	if (xusbxti && !IS_ERR(xusbxti)) {
36		switch (clk_get_rate(xusbxti)) {
37		case 12 * MHZ:
38			phyclk |= S3C_PHYCLK_CLKSEL_12M;
39			break;
40		case 24 * MHZ:
41			phyclk |= S3C_PHYCLK_CLKSEL_24M;
42			break;
43		default:
44		case 48 * MHZ:
45			/* default reference clock */
46			break;
47		}
48		clk_put(xusbxti);
49	}
50
51	/* TODO: select external clock/oscillator */
52	writel(phyclk | S3C_PHYCLK_CLK_FORCE, S3C_PHYCLK);
53
54	/* set to normal OTG PHY */
55	writel((readl(S3C_PHYPWR) & ~S3C_PHYPWR_NORMAL_MASK), S3C_PHYPWR);
56	mdelay(1);
57
58	/* reset OTG PHY and Link */
59	writel(S3C_RSTCON_PHY | S3C_RSTCON_HCLK | S3C_RSTCON_PHYCLK,
60			S3C_RSTCON);
61	udelay(20);	/* at-least 10uS */
62	writel(0, S3C_RSTCON);
63
64	return 0;
65}
66
67static int s3c_usb_otgphy_exit(struct platform_device *pdev)
68{
69	writel((readl(S3C_PHYPWR) | S3C_PHYPWR_ANALOG_POWERDOWN |
70				S3C_PHYPWR_OTG_DISABLE), S3C_PHYPWR);
71
72	writel(readl(S3C64XX_OTHERS) & ~S3C64XX_OTHERS_USBMASK, S3C64XX_OTHERS);
73
74	return 0;
75}
76
77int s5p_usb_phy_init(struct platform_device *pdev, int type)
78{
79	if (type == USB_PHY_TYPE_DEVICE)
80		return s3c_usb_otgphy_init(pdev);
81
82	return -EINVAL;
83}
84
85int s5p_usb_phy_exit(struct platform_device *pdev, int type)
86{
87	if (type == USB_PHY_TYPE_DEVICE)
88		return s3c_usb_otgphy_exit(pdev);
89
90	return -EINVAL;
91}
92