Merge branch 'perf-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...
[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 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 (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
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 s5p_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 s5p_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 }