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 "map.h"
12 #include "cpu.h"
13 #include "usb-phy.h"
14
15 #include "regs-sys-s3c64xx.h"
16 #include "regs-usb-hsotg-phy-s3c64xx.h"
17
18 enum samsung_usb_phy_type {
19 USB_PHY_TYPE_DEVICE,
20 USB_PHY_TYPE_HOST,
21 };
22
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 (!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
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
76 int s3c_usb_phy_init(struct platform_device *pdev, int type)
77 {
78 if (type == USB_PHY_TYPE_DEVICE)
79 return s3c_usb_otgphy_init(pdev);
80
81 return -EINVAL;
82 }
83
84 int s3c_usb_phy_exit(struct platform_device *pdev, int type)
85 {
86 if (type == USB_PHY_TYPE_DEVICE)
87 return s3c_usb_otgphy_exit(pdev);
88
89 return -EINVAL;
90 }
91
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