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/usb-phy.h>
20
21 #include "regs-sys.h"
22 #include "regs-usb-hsotg-phy.h"
23
s3c_usb_otgphy_init(struct platform_device * pdev)24 static 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
s3c_usb_otgphy_exit(struct platform_device * pdev)67 static 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
s5p_usb_phy_init(struct platform_device * pdev,int type)77 int 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
s5p_usb_phy_exit(struct platform_device * pdev,int type)85 int 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