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Add support for the USB PHY on imx6 SoCs. Pretty minimal at this point,

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but enough to get usb host mode working.
This commit is contained in:
Ian Lepore 2013-10-31 14:52:06 +00:00
parent c48efaecf6
commit c8c16b3df2
1 changed files with 189 additions and 0 deletions
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189
sys/arm/freescale/imx/imx6_usbphy.c Normal file
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/*-
* Copyright (c) 2013 Ian Lepore <ian@freebsd.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
/*
* USBPHY driver for Freescale i.MX6 family of SoCs.
*/
#include "opt_bus.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/bus.h>
#include <sys/rman.h>
#include <dev/ofw/ofw_bus.h>
#include <dev/ofw/ofw_bus_subr.h>
#include <machine/bus.h>
#include <arm/freescale/imx/imx_machdep.h>
#include <arm/freescale/imx/imx6_anatopreg.h>
#include <arm/freescale/imx/imx6_anatopvar.h>
/*
* Hardware register defines.
*/
#define PWD_REG 0x0000
#define CTRL_STATUS_REG 0x0030
#define CTRL_SET_REG 0x0034
#define CTRL_CLR_REG 0x0038
#define CTRL_TOGGLE_REG 0x003c
#define CTRL_SFTRST (1 << 31)
#define CTRL_CLKGATE (1 << 30)
#define CTRL_ENUTMILEVEL3 (1 << 15)
#define CTRL_ENUTMILEVEL2 (1 << 14)
struct usbphy_softc {
device_t dev;
struct resource *mem_res;
u_int phy_num;
};
static int
usbphy_detach(device_t dev)
{
struct usbphy_softc *sc;
sc = device_get_softc(dev);
if (sc->mem_res != NULL)
bus_release_resource(dev, SYS_RES_MEMORY, 0, sc->mem_res);
return (0);
}
static int
usbphy_attach(device_t dev)
{
struct usbphy_softc *sc;
int err, regoff, rid;
sc = device_get_softc(dev);
err = 0;
/* Allocate bus_space resources. */
rid = 0;
sc->mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid,
RF_ACTIVE);
if (sc->mem_res == NULL) {
device_printf(dev, "Cannot allocate memory resources\n");
err = ENXIO;
goto out;
}
/*
* XXX Totally lame way to get the unit number (but not quite as lame as
* adding an ad-hoc property to the fdt data). This works as long as
* this driver is used for imx6 only.
*/
const uint32_t PWD_PHY1_REG_PHYSADDR = 0x020c9000;
if (BUS_SPACE_PHYSADDR(sc->mem_res, 0) == PWD_PHY1_REG_PHYSADDR) {
sc->phy_num = 0;
regoff = 0;
} else {
sc->phy_num = 1;
regoff = 0x60;
}
/*
* Based on a note in the u-boot source code, disable charger detection
* to avoid degrading the differential signaling on the DP line. Note
* that this disables (by design) both charger detection and contact
* detection, because of the screwball mix of active-high and active-low
* bits in this register.
*/
imx6_anatop_write_4(IMX6_ANALOG_USB1_CHRG_DETECT + regoff,
IMX6_ANALOG_USB_CHRG_DETECT_N_ENABLE |
IMX6_ANALOG_USB_CHRG_DETECT_N_CHK_CHRG);
imx6_anatop_write_4(IMX6_ANALOG_USB1_CHRG_DETECT + regoff,
IMX6_ANALOG_USB_CHRG_DETECT_N_ENABLE |
IMX6_ANALOG_USB_CHRG_DETECT_N_CHK_CHRG);
/* XXX Configure the overcurrent detection here. */
/*
* Turn on the phy clocks.
*/
imx_ccm_usbphy_enable(dev);
/*
* Set the software reset bit, then clear both it and the clock gate bit
* to bring the device out of reset with the clock running.
*/
bus_write_4(sc->mem_res, CTRL_SET_REG, CTRL_SFTRST);
bus_write_4(sc->mem_res, CTRL_CLR_REG, CTRL_SFTRST | CTRL_CLKGATE);
/* Power up: clear all bits in the powerdown register. */
bus_write_4(sc->mem_res, PWD_REG, 0);
err = 0;
out:
if (err != 0)
usbphy_detach(dev);
return (err);
}
static int
usbphy_probe(device_t dev)
{
if (ofw_bus_is_compatible(dev, "fsl,imx6q-usbphy") == 0)
return (ENXIO);
device_set_desc(dev, "Freescale i.MX6 USB PHY");
return (BUS_PROBE_DEFAULT);
}
static device_method_t usbphy_methods[] = {
/* Device interface */
DEVMETHOD(device_probe, usbphy_probe),
DEVMETHOD(device_attach, usbphy_attach),
DEVMETHOD(device_detach, usbphy_detach),
DEVMETHOD_END
};
static driver_t usbphy_driver = {
"usbphy",
usbphy_methods,
sizeof(struct usbphy_softc)
};
static devclass_t usbphy_devclass;
DRIVER_MODULE(usbphy, simplebus, usbphy_driver, usbphy_devclass, 0, 0);