imx6_usbphy.c revision 266371 
1/*-
2 * Copyright (c) 2013 Ian Lepore <ian@freebsd.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27#include <sys/cdefs.h>
28__FBSDID("$FreeBSD: stable/10/sys/arm/freescale/imx/imx6_usbphy.c 266371 2014-05-17 22:29:24Z ian $");
29
30/*
31 * USBPHY driver for Freescale i.MX6 family of SoCs.
32 */
33
34#include "opt_bus.h"
35
36#include <sys/param.h>
37#include <sys/systm.h>
38#include <sys/kernel.h>
39#include <sys/module.h>
40#include <sys/bus.h>
41#include <sys/rman.h>
42
43#include <dev/ofw/ofw_bus.h>
44#include <dev/ofw/ofw_bus_subr.h>
45
46#include <machine/bus.h>
47
48#include <arm/freescale/imx/imx_ccmvar.h>
49#include <arm/freescale/imx/imx6_anatopreg.h>
50#include <arm/freescale/imx/imx6_anatopvar.h>
51
52/*
53 * Hardware register defines.
54 */
55#define	PWD_REG				0x0000
56#define	CTRL_STATUS_REG			0x0030
57#define	CTRL_SET_REG			0x0034
58#define	CTRL_CLR_REG			0x0038
59#define	CTRL_TOGGLE_REG			0x003c
60#define	  CTRL_SFTRST			  (1U << 31)
61#define	  CTRL_CLKGATE			  (1 << 30)
62#define	  CTRL_ENUTMILEVEL3		  (1 << 15)
63#define	  CTRL_ENUTMILEVEL2		  (1 << 14)
64
65struct usbphy_softc {
66	device_t	dev;
67	struct resource	*mem_res;
68	u_int		phy_num;
69};
70
71static int
72usbphy_detach(device_t dev)
73{
74	struct usbphy_softc *sc;
75
76	sc = device_get_softc(dev);
77
78	if (sc->mem_res != NULL)
79		bus_release_resource(dev, SYS_RES_MEMORY, 0, sc->mem_res);
80
81	return (0);
82}
83
84static int
85usbphy_attach(device_t dev)
86{
87	struct usbphy_softc *sc;
88	int err, regoff, rid;
89
90	sc = device_get_softc(dev);
91	err = 0;
92
93	/* Allocate bus_space resources. */
94	rid = 0;
95	sc->mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid,
96	    RF_ACTIVE);
97	if (sc->mem_res == NULL) {
98		device_printf(dev, "Cannot allocate memory resources\n");
99		err = ENXIO;
100		goto out;
101	}
102
103	/*
104	 * XXX Totally lame way to get the unit number (but not quite as lame as
105	 * adding an ad-hoc property to the fdt data).  This works as long as
106	 * this driver is used for imx6 only.
107	 */
108	const uint32_t PWD_PHY1_REG_PHYSADDR = 0x020c9000;
109	if (BUS_SPACE_PHYSADDR(sc->mem_res, 0) == PWD_PHY1_REG_PHYSADDR) {
110		sc->phy_num = 0;
111		regoff = 0;
112	} else {
113		sc->phy_num = 1;
114		regoff = 0x60;
115	}
116
117	/*
118	 * Based on a note in the u-boot source code, disable charger detection
119	 * to avoid degrading the differential signaling on the DP line.  Note
120	 * that this disables (by design) both charger detection and contact
121	 * detection, because of the screwball mix of active-high and active-low
122	 * bits in this register.
123	 */
124	imx6_anatop_write_4(IMX6_ANALOG_USB1_CHRG_DETECT + regoff,
125	    IMX6_ANALOG_USB_CHRG_DETECT_N_ENABLE |
126	    IMX6_ANALOG_USB_CHRG_DETECT_N_CHK_CHRG);
127
128	imx6_anatop_write_4(IMX6_ANALOG_USB1_CHRG_DETECT + regoff,
129	    IMX6_ANALOG_USB_CHRG_DETECT_N_ENABLE |
130	    IMX6_ANALOG_USB_CHRG_DETECT_N_CHK_CHRG);
131
132	/* XXX Configure the overcurrent detection here. */
133
134	/*
135	 * Turn on the phy clocks.
136	 */
137	imx_ccm_usbphy_enable(dev);
138
139	/*
140	 * Set the software reset bit, then clear both it and the clock gate bit
141	 * to bring the device out of reset with the clock running.
142	 */
143	bus_write_4(sc->mem_res, CTRL_SET_REG, CTRL_SFTRST);
144	bus_write_4(sc->mem_res, CTRL_CLR_REG, CTRL_SFTRST | CTRL_CLKGATE);
145
146	/* Power up: clear all bits in the powerdown register. */
147	bus_write_4(sc->mem_res, PWD_REG, 0);
148
149	err = 0;
150
151out:
152
153	if (err != 0)
154		usbphy_detach(dev);
155
156	return (err);
157}
158
159static int
160usbphy_probe(device_t dev)
161{
162
163	if (!ofw_bus_status_okay(dev))
164		return (ENXIO);
165
166	if (ofw_bus_is_compatible(dev, "fsl,imx6q-usbphy") == 0)
167		return (ENXIO);
168
169	device_set_desc(dev, "Freescale i.MX6 USB PHY");
170
171	return (BUS_PROBE_DEFAULT);
172}
173
174static device_method_t usbphy_methods[] = {
175	/* Device interface */
176	DEVMETHOD(device_probe,  usbphy_probe),
177	DEVMETHOD(device_attach, usbphy_attach),
178	DEVMETHOD(device_detach, usbphy_detach),
179
180	DEVMETHOD_END
181};
182
183static driver_t usbphy_driver = {
184	"usbphy",
185	usbphy_methods,
186	sizeof(struct usbphy_softc)
187};
188
189static devclass_t usbphy_devclass;
190
191DRIVER_MODULE(usbphy, simplebus, usbphy_driver, usbphy_devclass, 0, 0);
192
193