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 <mach/regs-sys.h>
19 #include <plat/cpu.h>
20 #include <plat/regs-usb-hsotg-phy.h>
21 #include <plat/usb-phy.h>
22
s3c_usb_otgphy_init(struct platform_device * pdev)23 static int s3c_usb_otgphy_init(struct platform_device *pdev)
24 {
25 struct clk *xusbxti;
26 u32 phyclk;
27
28 writel(readl(S3C64XX_OTHERS) | S3C64XX_OTHERS_USBMASK, S3C64XX_OTHERS);
29
30 /* set clock frequency for PLL */
31 phyclk = readl(S3C_PHYCLK) & ~S3C_PHYCLK_CLKSEL_MASK;
32
33 xusbxti = clk_get(&pdev->dev, "xusbxti");
34 if (xusbxti && !IS_ERR(xusbxti)) {
35 switch (clk_get_rate(xusbxti)) {
36 case 12 * MHZ:
37 phyclk |= S3C_PHYCLK_CLKSEL_12M;
38 break;
39 case 24 * MHZ:
40 phyclk |= S3C_PHYCLK_CLKSEL_24M;
41 break;
42 default:
43 case 48 * MHZ:
44 /* default reference clock */
45 break;
46 }
47 clk_put(xusbxti);
48 }
49
50 /* TODO: select external clock/oscillator */
51 writel(phyclk | S3C_PHYCLK_CLK_FORCE, S3C_PHYCLK);
52
53 /* set to normal OTG PHY */
54 writel((readl(S3C_PHYPWR) & ~S3C_PHYPWR_NORMAL_MASK), S3C_PHYPWR);
55 mdelay(1);
56
57 /* reset OTG PHY and Link */
58 writel(S3C_RSTCON_PHY | S3C_RSTCON_HCLK | S3C_RSTCON_PHYCLK,
59 S3C_RSTCON);
60 udelay(20); /* at-least 10uS */
61 writel(0, S3C_RSTCON);
62
63 return 0;
64 }
65
s3c_usb_otgphy_exit(struct platform_device * pdev)66 static int s3c_usb_otgphy_exit(struct platform_device *pdev)
67 {
68 writel((readl(S3C_PHYPWR) | S3C_PHYPWR_ANALOG_POWERDOWN |
69 S3C_PHYPWR_OTG_DISABLE), S3C_PHYPWR);
70
71 writel(readl(S3C64XX_OTHERS) & ~S3C64XX_OTHERS_USBMASK, S3C64XX_OTHERS);
72
73 return 0;
74 }
75
s5p_usb_phy_init(struct platform_device * pdev,int type)76 int s5p_usb_phy_init(struct platform_device *pdev, int type)
77 {
78 if (type == S5P_USB_PHY_DEVICE)
79 return s3c_usb_otgphy_init(pdev);
80
81 return -EINVAL;
82 }
83
s5p_usb_phy_exit(struct platform_device * pdev,int type)84 int s5p_usb_phy_exit(struct platform_device *pdev, int type)
85 {
86 if (type == S5P_USB_PHY_DEVICE)
87 return s3c_usb_otgphy_exit(pdev);
88
89 return -EINVAL;
90 }
91