diff options
| -rw-r--r-- | sys/arm/freescale/imx/imx6_usbphy.c | 189 |
1 files changed, 189 insertions, 0 deletions
diff --git a/sys/arm/freescale/imx/imx6_usbphy.c b/sys/arm/freescale/imx/imx6_usbphy.c new file mode 100644 index 0000000..aaffde4 --- /dev/null +++ b/sys/arm/freescale/imx/imx6_usbphy.c @@ -0,0 +1,189 @@ +/*- + * 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); + |
