1 // SPDX-License-Identifier: GPL-2.0+
2 //
3 // Copyright (C) 2011 Samsung Electronics Co.Ltd
4 // Author: Joonyoung Shim <jy0922.shim@samsung.com>
5
6 #include <linux/clk.h>
7 #include <linux/delay.h>
8 #include <linux/err.h>
9 #include <linux/io.h>
10 #include <linux/platform_device.h>
11 #include <mach/map.h>
12 #include <plat/cpu.h>
13 #include <plat/usb-phy.h>
14
15 #include "regs-sys.h"
16 #include "regs-usb-hsotg-phy.h"
17
s3c_usb_otgphy_init(struct platform_device * pdev)18 static int s3c_usb_otgphy_init(struct platform_device *pdev)
19 {
20 struct clk *xusbxti;
21 u32 phyclk;
22
23 writel(readl(S3C64XX_OTHERS) | S3C64XX_OTHERS_USBMASK, S3C64XX_OTHERS);
24
25 /* set clock frequency for PLL */
26 phyclk = readl(S3C_PHYCLK) & ~S3C_PHYCLK_CLKSEL_MASK;
27
28 xusbxti = clk_get(&pdev->dev, "xusbxti");
29 if (xusbxti && !IS_ERR(xusbxti)) {
30 switch (clk_get_rate(xusbxti)) {
31 case 12 * MHZ:
32 phyclk |= S3C_PHYCLK_CLKSEL_12M;
33 break;
34 case 24 * MHZ:
35 phyclk |= S3C_PHYCLK_CLKSEL_24M;
36 break;
37 default:
38 case 48 * MHZ:
39 /* default reference clock */
40 break;
41 }
42 clk_put(xusbxti);
43 }
44
45 /* TODO: select external clock/oscillator */
46 writel(phyclk | S3C_PHYCLK_CLK_FORCE, S3C_PHYCLK);
47
48 /* set to normal OTG PHY */
49 writel((readl(S3C_PHYPWR) & ~S3C_PHYPWR_NORMAL_MASK), S3C_PHYPWR);
50 mdelay(1);
51
52 /* reset OTG PHY and Link */
53 writel(S3C_RSTCON_PHY | S3C_RSTCON_HCLK | S3C_RSTCON_PHYCLK,
54 S3C_RSTCON);
55 udelay(20); /* at-least 10uS */
56 writel(0, S3C_RSTCON);
57
58 return 0;
59 }
60
s3c_usb_otgphy_exit(struct platform_device * pdev)61 static int s3c_usb_otgphy_exit(struct platform_device *pdev)
62 {
63 writel((readl(S3C_PHYPWR) | S3C_PHYPWR_ANALOG_POWERDOWN |
64 S3C_PHYPWR_OTG_DISABLE), S3C_PHYPWR);
65
66 writel(readl(S3C64XX_OTHERS) & ~S3C64XX_OTHERS_USBMASK, S3C64XX_OTHERS);
67
68 return 0;
69 }
70
s5p_usb_phy_init(struct platform_device * pdev,int type)71 int s5p_usb_phy_init(struct platform_device *pdev, int type)
72 {
73 if (type == USB_PHY_TYPE_DEVICE)
74 return s3c_usb_otgphy_init(pdev);
75
76 return -EINVAL;
77 }
78
s5p_usb_phy_exit(struct platform_device * pdev,int type)79 int s5p_usb_phy_exit(struct platform_device *pdev, int type)
80 {
81 if (type == USB_PHY_TYPE_DEVICE)
82 return s3c_usb_otgphy_exit(pdev);
83
84 return -EINVAL;
85 }
86
