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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * This file configures the internal USB PHY in OMAP4430. Used
4 * with TWL6030 transceiver and MUSB on OMAP4430.
5 *
6 * Copyright (C) 2010 Texas Instruments Incorporated - https://www.ti.com
7 * Author: Hema HK <hemahk@ti.com>
8 */
9
10#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
11
12#include <linux/types.h>
13#include <linux/delay.h>
14#include <linux/clk.h>
15#include <linux/io.h>
16#include <linux/err.h>
17#include <linux/usb.h>
18#include <linux/usb/musb.h>
19
20#include "soc.h"
21#include "control.h"
22
23#define CONTROL_DEV_CONF 0x300
24#define PHY_PD 0x1
25
26/**
27 * omap4430_phy_power_down: disable MUSB PHY during early init
28 *
29 * OMAP4 MUSB PHY module is enabled by default on reset, but this will
30 * prevent core retention if not disabled by SW. USB driver will
31 * later on enable this, once and if the driver needs it.
32 */
33static int __init omap4430_phy_power_down(void)
34{
35 void __iomem *ctrl_base;
36
37 if (!cpu_is_omap44xx())
38 return 0;
39
40 ctrl_base = ioremap(OMAP443X_SCM_BASE, SZ_1K);
41 if (!ctrl_base) {
42 pr_err("control module ioremap failed\n");
43 return -ENOMEM;
44 }
45
46 /* Power down the phy */
47 writel_relaxed(PHY_PD, ctrl_base + CONTROL_DEV_CONF);
48
49 iounmap(ctrl_base);
50
51 return 0;
52}
53omap_early_initcall(omap4430_phy_power_down);
1/*
2 * This file configures the internal USB PHY in OMAP4430. Used
3 * with TWL6030 transceiver and MUSB on OMAP4430.
4 *
5 * Copyright (C) 2010 Texas Instruments Incorporated - http://www.ti.com
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * Author: Hema HK <hemahk@ti.com>
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21 *
22 */
23
24#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
25
26#include <linux/types.h>
27#include <linux/delay.h>
28#include <linux/clk.h>
29#include <linux/io.h>
30#include <linux/err.h>
31#include <linux/usb.h>
32#include <linux/usb/musb.h>
33
34#include "soc.h"
35#include "control.h"
36#include "usb.h"
37
38#define CONTROL_DEV_CONF 0x300
39#define PHY_PD 0x1
40
41/**
42 * omap4430_phy_power_down: disable MUSB PHY during early init
43 *
44 * OMAP4 MUSB PHY module is enabled by default on reset, but this will
45 * prevent core retention if not disabled by SW. USB driver will
46 * later on enable this, once and if the driver needs it.
47 */
48static int __init omap4430_phy_power_down(void)
49{
50 void __iomem *ctrl_base;
51
52 if (!cpu_is_omap44xx())
53 return 0;
54
55 ctrl_base = ioremap(OMAP443X_SCM_BASE, SZ_1K);
56 if (!ctrl_base) {
57 pr_err("control module ioremap failed\n");
58 return -ENOMEM;
59 }
60
61 /* Power down the phy */
62 writel_relaxed(PHY_PD, ctrl_base + CONTROL_DEV_CONF);
63
64 iounmap(ctrl_base);
65
66 return 0;
67}
68omap_early_initcall(omap4430_phy_power_down);
69
70void am35x_musb_reset(void)
71{
72 u32 regval;
73
74 /* Reset the musb interface */
75 regval = omap_ctrl_readl(AM35XX_CONTROL_IP_SW_RESET);
76
77 regval |= AM35XX_USBOTGSS_SW_RST;
78 omap_ctrl_writel(regval, AM35XX_CONTROL_IP_SW_RESET);
79
80 regval &= ~AM35XX_USBOTGSS_SW_RST;
81 omap_ctrl_writel(regval, AM35XX_CONTROL_IP_SW_RESET);
82
83 regval = omap_ctrl_readl(AM35XX_CONTROL_IP_SW_RESET);
84}
85
86void am35x_musb_phy_power(u8 on)
87{
88 unsigned long timeout = jiffies + msecs_to_jiffies(100);
89 u32 devconf2;
90
91 if (on) {
92 /*
93 * Start the on-chip PHY and its PLL.
94 */
95 devconf2 = omap_ctrl_readl(AM35XX_CONTROL_DEVCONF2);
96
97 devconf2 &= ~(CONF2_RESET | CONF2_PHYPWRDN | CONF2_OTGPWRDN);
98 devconf2 |= CONF2_PHY_PLLON;
99
100 omap_ctrl_writel(devconf2, AM35XX_CONTROL_DEVCONF2);
101
102 pr_info("Waiting for PHY clock good...\n");
103 while (!(omap_ctrl_readl(AM35XX_CONTROL_DEVCONF2)
104 & CONF2_PHYCLKGD)) {
105 cpu_relax();
106
107 if (time_after(jiffies, timeout)) {
108 pr_err("musb PHY clock good timed out\n");
109 break;
110 }
111 }
112 } else {
113 /*
114 * Power down the on-chip PHY.
115 */
116 devconf2 = omap_ctrl_readl(AM35XX_CONTROL_DEVCONF2);
117
118 devconf2 &= ~CONF2_PHY_PLLON;
119 devconf2 |= CONF2_PHYPWRDN | CONF2_OTGPWRDN;
120 omap_ctrl_writel(devconf2, AM35XX_CONTROL_DEVCONF2);
121 }
122}
123
124void am35x_musb_clear_irq(void)
125{
126 u32 regval;
127
128 regval = omap_ctrl_readl(AM35XX_CONTROL_LVL_INTR_CLEAR);
129 regval |= AM35XX_USBOTGSS_INT_CLR;
130 omap_ctrl_writel(regval, AM35XX_CONTROL_LVL_INTR_CLEAR);
131 regval = omap_ctrl_readl(AM35XX_CONTROL_LVL_INTR_CLEAR);
132}
133
134void am35x_set_mode(u8 musb_mode)
135{
136 u32 devconf2 = omap_ctrl_readl(AM35XX_CONTROL_DEVCONF2);
137
138 devconf2 &= ~CONF2_OTGMODE;
139 switch (musb_mode) {
140 case MUSB_HOST: /* Force VBUS valid, ID = 0 */
141 devconf2 |= CONF2_FORCE_HOST;
142 break;
143 case MUSB_PERIPHERAL: /* Force VBUS valid, ID = 1 */
144 devconf2 |= CONF2_FORCE_DEVICE;
145 break;
146 case MUSB_OTG: /* Don't override the VBUS/ID comparators */
147 devconf2 |= CONF2_NO_OVERRIDE;
148 break;
149 default:
150 pr_info("Unsupported mode %u\n", musb_mode);
151 }
152
153 omap_ctrl_writel(devconf2, AM35XX_CONTROL_DEVCONF2);
154}