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