summaryrefslogtreecommitdiff
path: root/drivers/usb/host/ehci-mxs.c
blob: 9872415562c26203d349f0ca63fa2a0cd9deda80 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
/*
 * Freescale i.MX28 USB Host driver
 *
 * Copyright (C) 2011 Marek Vasut <marek.vasut@gmail.com>
 * on behalf of DENX Software Engineering GmbH
 *
 * SPDX-License-Identifier:	GPL-2.0+
 */

#include <common.h>
#include <asm/io.h>
#include <asm/arch/imx-regs.h>
#include <errno.h>

#include "ehci.h"

/* This DIGCTL register ungates clock to USB */
#define	HW_DIGCTL_CTRL			0x8001c000
#define	HW_DIGCTL_CTRL_USB0_CLKGATE	(1 << 2)
#define	HW_DIGCTL_CTRL_USB1_CLKGATE	(1 << 16)

struct ehci_mxs_port {
	uint32_t		usb_regs;
	struct mxs_usbphy_regs	*phy_regs;

	struct mxs_register_32	*pll;
	uint32_t		pll_en_bits;
	uint32_t		pll_dis_bits;
	uint32_t		gate_bits;
};

static const struct ehci_mxs_port mxs_port[] = {
#ifdef CONFIG_EHCI_MXS_PORT0
	{
		MXS_USBCTRL0_BASE,
		(struct mxs_usbphy_regs *)MXS_USBPHY0_BASE,
		(struct mxs_register_32 *)(MXS_CLKCTRL_BASE +
			offsetof(struct mxs_clkctrl_regs,
			hw_clkctrl_pll0ctrl0_reg)),
		CLKCTRL_PLL0CTRL0_EN_USB_CLKS | CLKCTRL_PLL0CTRL0_POWER,
		CLKCTRL_PLL0CTRL0_EN_USB_CLKS,
		HW_DIGCTL_CTRL_USB0_CLKGATE,
	},
#endif
#ifdef CONFIG_EHCI_MXS_PORT1
	{
		MXS_USBCTRL1_BASE,
		(struct mxs_usbphy_regs *)MXS_USBPHY1_BASE,
		(struct mxs_register_32 *)(MXS_CLKCTRL_BASE +
			offsetof(struct mxs_clkctrl_regs,
			hw_clkctrl_pll1ctrl0_reg)),
		CLKCTRL_PLL1CTRL0_EN_USB_CLKS | CLKCTRL_PLL1CTRL0_POWER,
		CLKCTRL_PLL1CTRL0_EN_USB_CLKS,
		HW_DIGCTL_CTRL_USB1_CLKGATE,
	},
#endif
};

static int ehci_mxs_toggle_clock(const struct ehci_mxs_port *port, int enable)
{
	struct mxs_register_32 *digctl_ctrl =
		(struct mxs_register_32 *)HW_DIGCTL_CTRL;
	int pll_offset, dig_offset;

	if (enable) {
		pll_offset = offsetof(struct mxs_register_32, reg_set);
		dig_offset = offsetof(struct mxs_register_32, reg_clr);
		writel(port->gate_bits, (u32)&digctl_ctrl->reg + dig_offset);
		writel(port->pll_en_bits, (u32)port->pll + pll_offset);
	} else {
		pll_offset = offsetof(struct mxs_register_32, reg_clr);
		dig_offset = offsetof(struct mxs_register_32, reg_set);
		writel(port->pll_dis_bits, (u32)port->pll + pll_offset);
		writel(port->gate_bits, (u32)&digctl_ctrl->reg + dig_offset);
	}

	return 0;
}

int __weak board_ehci_hcd_init(int port)
{
	return 0;
}

int __weak board_ehci_hcd_exit(int port)
{
	return 0;
}

int ehci_hcd_init(int index, enum usb_init_type init,
		struct ehci_hccr **hccr, struct ehci_hcor **hcor)
{

	int ret;
	uint32_t usb_base, cap_base;
	const struct ehci_mxs_port *port;

	if ((index < 0) || (index >= ARRAY_SIZE(mxs_port))) {
		printf("Invalid port index (index = %d)!\n", index);
		return -EINVAL;
	}

	ret = board_ehci_hcd_init(index);
	if (ret)
		return ret;

	port = &mxs_port[index];

	/* Reset the PHY block */
	writel(USBPHY_CTRL_SFTRST, &port->phy_regs->hw_usbphy_ctrl_set);
	udelay(10);
	writel(USBPHY_CTRL_SFTRST | USBPHY_CTRL_CLKGATE,
		&port->phy_regs->hw_usbphy_ctrl_clr);

	/* Enable USB clock */
	ret = ehci_mxs_toggle_clock(port, 1);
	if (ret)
		return ret;

	/* Start USB PHY */
	writel(0, &port->phy_regs->hw_usbphy_pwd);

	/* Enable UTMI+ Level 2 and Level 3 compatibility */
	writel(USBPHY_CTRL_ENUTMILEVEL3 | USBPHY_CTRL_ENUTMILEVEL2 | 1,
		&port->phy_regs->hw_usbphy_ctrl_set);

	usb_base = port->usb_regs + 0x100;
	*hccr = (struct ehci_hccr *)usb_base;

	cap_base = ehci_readl(&(*hccr)->cr_capbase);
	*hcor = (struct ehci_hcor *)(usb_base + HC_LENGTH(cap_base));

	return 0;
}

int ehci_hcd_stop(int index)
{
	int ret;
	uint32_t usb_base, cap_base, tmp;
	struct ehci_hccr *hccr;
	struct ehci_hcor *hcor;
	const struct ehci_mxs_port *port;

	if ((index < 0) || (index >= ARRAY_SIZE(mxs_port))) {
		printf("Invalid port index (index = %d)!\n", index);
		return -EINVAL;
	}

	port = &mxs_port[index];

	/* Stop the USB port */
	usb_base = port->usb_regs + 0x100;
	hccr = (struct ehci_hccr *)usb_base;
	cap_base = ehci_readl(&hccr->cr_capbase);
	hcor = (struct ehci_hcor *)(usb_base + HC_LENGTH(cap_base));

	tmp = ehci_readl(&hcor->or_usbcmd);
	tmp &= ~CMD_RUN;
	ehci_writel(&hcor->or_usbcmd, tmp);

	/* Disable the PHY */
	tmp = USBPHY_PWD_RXPWDRX | USBPHY_PWD_RXPWDDIFF |
		USBPHY_PWD_RXPWD1PT1 | USBPHY_PWD_RXPWDENV |
		USBPHY_PWD_TXPWDV2I | USBPHY_PWD_TXPWDIBIAS |
		USBPHY_PWD_TXPWDFS;
	writel(tmp, &port->phy_regs->hw_usbphy_pwd);

	/* Disable USB clock */
	ret = ehci_mxs_toggle_clock(port, 0);

	board_ehci_hcd_exit(index);

	return ret;
}