Merge tag 'trace-v4.16-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt...
[sfrench/cifs-2.6.git] / arch / arm / mach-s3c64xx / setup-usb-phy.c
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
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
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
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
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 }