1 /*
2  * drivers/usb/gadget/dwc2_udc_otg.c
3  * Designware DWC2 on-chip full/high speed USB OTG 2.0 device controllers
4  *
5  * Copyright (C) 2008 for Samsung Electronics
6  *
7  * BSP Support for Samsung's UDC driver
8  * available at:
9  * git://git.kernel.org/pub/scm/linux/kernel/git/kki_ap/linux-2.6-samsung.git
10  *
11  * State machine bugfixes:
12  * Marek Szyprowski <m.szyprowski@samsung.com>
13  *
14  * Ported to u-boot:
15  * Marek Szyprowski <m.szyprowski@samsung.com>
16  * Lukasz Majewski <l.majewski@samsumg.com>
17  *
18  * SPDX-License-Identifier:	GPL-2.0+
19  */
20 
21 #include <common.h>
22 #include <asm/errno.h>
23 #include <linux/list.h>
24 #include <malloc.h>
25 
26 #include <linux/usb/ch9.h>
27 #include <linux/usb/gadget.h>
28 
29 #include <asm/byteorder.h>
30 #include <asm/unaligned.h>
31 #include <asm/io.h>
32 
33 #include <asm/mach-types.h>
34 
35 #include "dwc2_udc_otg_regs.h"
36 #include "dwc2_udc_otg_priv.h"
37 #include <usb/lin_gadget_compat.h>
38 
39 #include <usb/dwc2_udc.h>
40 
41 void otg_phy_init(struct dwc2_udc *dev)
42 {
43 	unsigned int usb_phy_ctrl = dev->pdata->usb_phy_ctrl;
44 	struct dwc2_usbotg_phy *phy =
45 		(struct dwc2_usbotg_phy *)dev->pdata->regs_phy;
46 
47 	dev->pdata->phy_control(1);
48 
49 	/* USB PHY0 Enable */
50 	printf("USB PHY0 Enable\n");
51 
52 	/* Enable PHY */
53 	writel(readl(usb_phy_ctrl) | USB_PHY_CTRL_EN0, usb_phy_ctrl);
54 
55 	if (dev->pdata->usb_flags == PHY0_SLEEP) /* C210 Universal */
56 		writel((readl(&phy->phypwr)
57 			&~(PHY_0_SLEEP | OTG_DISABLE_0 | ANALOG_PWRDOWN)
58 			&~FORCE_SUSPEND_0), &phy->phypwr);
59 	else /* C110 GONI */
60 		writel((readl(&phy->phypwr) &~(OTG_DISABLE_0 | ANALOG_PWRDOWN)
61 			&~FORCE_SUSPEND_0), &phy->phypwr);
62 
63 	if (s5p_cpu_id == 0x4412)
64 		writel((readl(&phy->phyclk) & ~(EXYNOS4X12_ID_PULLUP0 |
65 			EXYNOS4X12_COMMON_ON_N0)) | EXYNOS4X12_CLK_SEL_24MHZ,
66 		       &phy->phyclk); /* PLL 24Mhz */
67 	else
68 		writel((readl(&phy->phyclk) & ~(ID_PULLUP0 | COMMON_ON_N0)) |
69 		       CLK_SEL_24MHZ, &phy->phyclk); /* PLL 24Mhz */
70 
71 	writel((readl(&phy->rstcon) &~(LINK_SW_RST | PHYLNK_SW_RST))
72 	       | PHY_SW_RST0, &phy->rstcon);
73 	udelay(10);
74 	writel(readl(&phy->rstcon)
75 	       &~(PHY_SW_RST0 | LINK_SW_RST | PHYLNK_SW_RST), &phy->rstcon);
76 	udelay(10);
77 }
78 
79 void otg_phy_off(struct dwc2_udc *dev)
80 {
81 	unsigned int usb_phy_ctrl = dev->pdata->usb_phy_ctrl;
82 	struct dwc2_usbotg_phy *phy =
83 		(struct dwc2_usbotg_phy *)dev->pdata->regs_phy;
84 
85 	/* reset controller just in case */
86 	writel(PHY_SW_RST0, &phy->rstcon);
87 	udelay(20);
88 	writel(readl(&phy->phypwr) &~PHY_SW_RST0, &phy->rstcon);
89 	udelay(20);
90 
91 	writel(readl(&phy->phypwr) | OTG_DISABLE_0 | ANALOG_PWRDOWN
92 	       | FORCE_SUSPEND_0, &phy->phypwr);
93 
94 	writel(readl(usb_phy_ctrl) &~USB_PHY_CTRL_EN0, usb_phy_ctrl);
95 
96 	writel((readl(&phy->phyclk) & ~(ID_PULLUP0 | COMMON_ON_N0)),
97 	      &phy->phyclk);
98 
99 	udelay(10000);
100 
101 	dev->pdata->phy_control(0);
102 }
103