a7fa939bb3
define a few imx_ccm_foo() functions that are implemented by the imx51 or imx6 ccm code. Of course, the imx6 ccm code is still more a wish than reality, so for now its implementations just return hard-coded numbers.
336 lines
10 KiB
C
336 lines
10 KiB
C
/*-
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* Copyright (c) 2010-2012 Semihalf
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* Copyright (c) 2012 The FreeBSD Foundation
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* Copyright (c) 2013 Ian Lepore <ian@freebsd.org>
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* All rights reserved.
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*
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* Portions of this software were developed by Oleksandr Rybalko
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* under sponsorship from the FreeBSD Foundation.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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/*
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* EHCI driver for Freescale i.MX SoCs which incorporate the USBOH3 controller.
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/module.h>
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#include <sys/bus.h>
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#include <sys/condvar.h>
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#include <sys/rman.h>
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#include <dev/ofw/ofw_bus.h>
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#include <dev/ofw/ofw_bus_subr.h>
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#include <dev/usb/usb.h>
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#include <dev/usb/usbdi.h>
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#include <dev/usb/usb_busdma.h>
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#include <dev/usb/usb_process.h>
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#include <dev/usb/usb_controller.h>
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#include <dev/usb/usb_bus.h>
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#include <dev/usb/controller/ehci.h>
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#include <dev/usb/controller/ehcireg.h>
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#include "usbdevs.h"
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#include <machine/bus.h>
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#include <machine/resource.h>
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#include <arm/freescale/imx/imx_ccmvar.h>
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#include "opt_platform.h"
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/*
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* Notes on the hardware and related FDT data seen in the wild.
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*
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* There are two sets of registers in the USBOH3 implementation; documentation
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* refers to them as "core" and "non-core" registers. A set of core register
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* exists for each OTG or EHCI device. There is a single set of non-core
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* registers per USBOH3, and they control aspects of operation not directly
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* related to the USB specs, such as whether interrupts from each of the core
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* devices are able to generate a SoC wakeup event.
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*
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* In the FreeBSD universe we might be inclined to describe the core and
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* non-core registers by using a pair of resource address/size values (two
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* entries in the reg property for each core). However, we have to work with
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* existing FDT data (which mostly comes from the linux universe), and the way
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* they've chosen to represent this is with an entry for a "usbmisc" device
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* whose reg property describes the non-core registers. The way we handle FDT
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* data, this means that the resources (memory-mapped register range) for the
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* non-core registers belongs to a device other than the echi devices.
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*
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* At the moment we have no need to access the non-core registers, so all of
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* this amounts to documenting what's known. The following compat strings have
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* been seen in existing FDT data:
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* - "fsl,imx25-usbmisc"
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* - "fsl,imx51-usbmisc";
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* - "fsl,imx6q-usbmisc";
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*
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* In addition to the single usbmisc device, the existing FDT data defines a
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* separate device for each of the OTG or EHCI cores within the USBOH3. Each of
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* those devices has a set of core registers described by the reg property.
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*
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* The core registers for each of the four cores in the USBOH3 are divided into
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* two parts: a set of imx-specific registers at an offset of 0 from the
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* beginning of the register range, and the standard USB (EHCI or OTG) registers
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* at an offset of 0x100 from the beginning of the register range. The FreeBSD
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* way of dealing with this might be to map out two ranges in the reg property,
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* but that's not what the alternate universe has done. To work with existing
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* FDT data, we acquire the resource that maps all the core registers, then use
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* bus_space_subregion() to create another resource that maps just the standard
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* USB registers, which we provide to the standard USB code in the ehci_softc.
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*
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* The following compat strings have been seen for the OTG and EHCI cores. The
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* FDT compat table in this driver contains all these strings, but as of this
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* writing, not all of these SoCs have been tested with the driver. The fact
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* that imx27 is common to all of them gives some hope that the driver will work
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* on all these SoCs.
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* - "fsl,imx23-usb", "fsl,imx27-usb";
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* - "fsl,imx25-usb", "fsl,imx27-usb";
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* - "fsl,imx28-usb", "fsl,imx27-usb";
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* - "fsl,imx51-usb", "fsl,imx27-usb";
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* - "fsl,imx53-usb", "fsl,imx27-usb";
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* - "fsl,imx6q-usb", "fsl,imx27-usb";
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*
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* The FDT data for some SoCs contains the following properties, which we don't
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* currently do anything with:
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* - fsl,usbmisc = <&usbmisc 0>;
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* - fsl,usbphy = <&usbphy0>;
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*
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* Some imx SoCs have FDT data related to USB PHY, some don't. We have separate
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* usbphy drivers where needed; this data is mentioned here just to keep all the
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* imx-FDT-usb-related info in one place. Here are the usbphy compat strings
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* known to exist:
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* - "nop-usbphy"
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* - "usb-nop-xceiv";
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* - "fsl,imx23-usbphy"
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* - "fsl,imx28-usbphy", "fsl,imx23-usbphy";
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* - "fsl,imx6q-usbphy", "fsl,imx23-usbphy";
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*
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*/
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static struct ofw_compat_data compat_data[] = {
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{"fsl,imx6q-usb", 1},
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{"fsl,imx53-usb", 1},
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{"fsl,imx51-usb", 1},
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{"fsl,imx28-usb", 1},
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{"fsl,imx27-usb", 1},
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{"fsl,imx25-usb", 1},
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{"fsl,imx23-usb", 1},
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{NULL, 0},
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};
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/*
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* Each EHCI device in the SoC has some SoC-specific per-device registers at an
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* offset of 0, then the standard EHCI registers begin at an offset of 0x100.
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*/
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#define IMX_EHCI_REG_OFF 0x100
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#define IMX_EHCI_REG_SIZE 0x100
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struct imx_ehci_softc {
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ehci_softc_t ehci_softc;
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struct resource *ehci_mem_res; /* EHCI core regs. */
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struct resource *ehci_irq_res; /* EHCI core IRQ. */
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};
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static int
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imx_ehci_probe(device_t dev)
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{
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if (!ofw_bus_status_okay(dev))
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return (ENXIO);
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if (ofw_bus_search_compatible(dev, compat_data)->ocd_data != 0) {
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device_set_desc(dev, "Freescale i.MX integrated USB controller");
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return (BUS_PROBE_DEFAULT);
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}
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return (ENXIO);
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}
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static int
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imx_ehci_detach(device_t dev)
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{
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struct imx_ehci_softc *sc;
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ehci_softc_t *esc;
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sc = device_get_softc(dev);
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esc = &sc->ehci_softc;
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if (esc->sc_bus.bdev != NULL)
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device_delete_child(dev, esc->sc_bus.bdev);
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if (esc->sc_flags & EHCI_SCFLG_DONEINIT)
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ehci_detach(esc);
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if (esc->sc_intr_hdl != NULL)
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bus_teardown_intr(dev, esc->sc_irq_res,
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esc->sc_intr_hdl);
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if (sc->ehci_irq_res != NULL)
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bus_release_resource(dev, SYS_RES_IRQ, 0,
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sc->ehci_irq_res);
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if (sc->ehci_mem_res != NULL)
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bus_release_resource(dev, SYS_RES_MEMORY, 0,
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sc->ehci_mem_res);
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usb_bus_mem_free_all(&esc->sc_bus, &ehci_iterate_hw_softc);
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/* During module unload there are lots of children leftover */
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device_delete_children(dev);
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return (0);
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}
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static int
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imx_ehci_attach(device_t dev)
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{
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struct imx_ehci_softc *sc;
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ehci_softc_t *esc;
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int err, rid;
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sc = device_get_softc(dev);
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esc = &sc->ehci_softc;
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err = 0;
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/* Allocate bus_space resources. */
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rid = 0;
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sc->ehci_mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid,
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RF_ACTIVE);
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if (sc->ehci_mem_res == NULL) {
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device_printf(dev, "Cannot allocate memory resources\n");
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err = ENXIO;
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goto out;
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}
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rid = 0;
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sc->ehci_irq_res = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid,
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RF_ACTIVE);
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if (sc->ehci_irq_res == NULL) {
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device_printf(dev, "Cannot allocate IRQ resources\n");
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err = ENXIO;
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goto out;
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}
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esc->sc_io_tag = rman_get_bustag(sc->ehci_mem_res);
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esc->sc_bus.parent = dev;
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esc->sc_bus.devices = esc->sc_devices;
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esc->sc_bus.devices_max = EHCI_MAX_DEVICES;
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if (usb_bus_mem_alloc_all(&esc->sc_bus, USB_GET_DMA_TAG(dev),
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&ehci_iterate_hw_softc) != 0) {
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device_printf(dev, "usb_bus_mem_alloc_all() failed\n");
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err = ENOMEM;
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goto out;
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}
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/*
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* Set handle to USB related registers subregion used by
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* generic EHCI driver.
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*/
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err = bus_space_subregion(esc->sc_io_tag,
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rman_get_bushandle(sc->ehci_mem_res),
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IMX_EHCI_REG_OFF, IMX_EHCI_REG_SIZE, &esc->sc_io_hdl);
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if (err != 0) {
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device_printf(dev, "bus_space_subregion() failed\n");
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err = ENXIO;
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goto out;
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}
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/* Setup interrupt handler. */
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err = bus_setup_intr(dev, sc->ehci_irq_res, INTR_TYPE_BIO, NULL,
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(driver_intr_t *)ehci_interrupt, esc, &esc->sc_intr_hdl);
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if (err != 0) {
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device_printf(dev, "Could not setup IRQ\n");
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goto out;
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}
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/* Turn on clocks. */
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imx_ccm_usb_enable(dev);
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/* Add USB bus device. */
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esc->sc_bus.bdev = device_add_child(dev, "usbus", -1);
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if (esc->sc_bus.bdev == NULL) {
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device_printf(dev, "Could not add USB device\n");
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goto out;
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}
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device_set_ivars(esc->sc_bus.bdev, &esc->sc_bus);
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esc->sc_id_vendor = USB_VENDOR_FREESCALE;
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strlcpy(esc->sc_vendor, "Freescale", sizeof(esc->sc_vendor));
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/* Set flags that affect ehci_init() behavior. */
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esc->sc_flags |= EHCI_SCFLG_DONTRESET | EHCI_SCFLG_NORESTERM;
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err = ehci_init(esc);
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if (err != 0) {
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device_printf(dev, "USB init failed, usb_err_t=%d\n",
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err);
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goto out;
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}
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esc->sc_flags |= EHCI_SCFLG_DONEINIT;
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/* Probe the bus. */
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err = device_probe_and_attach(esc->sc_bus.bdev);
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if (err != 0) {
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device_printf(dev,
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"device_probe_and_attach() failed\n");
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goto out;
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}
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err = 0;
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out:
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if (err != 0)
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imx_ehci_detach(dev);
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return (err);
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}
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static device_method_t ehci_methods[] = {
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/* Device interface */
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DEVMETHOD(device_probe, imx_ehci_probe),
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DEVMETHOD(device_attach, imx_ehci_attach),
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DEVMETHOD(device_detach, imx_ehci_detach),
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DEVMETHOD(device_suspend, bus_generic_suspend),
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DEVMETHOD(device_resume, bus_generic_resume),
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DEVMETHOD(device_shutdown, bus_generic_shutdown),
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/* Bus interface */
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DEVMETHOD(bus_print_child, bus_generic_print_child),
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DEVMETHOD_END
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};
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static driver_t ehci_driver = {
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"ehci",
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ehci_methods,
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sizeof(struct imx_ehci_softc)
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};
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static devclass_t ehci_devclass;
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DRIVER_MODULE(ehci, simplebus, ehci_driver, ehci_devclass, 0, 0);
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MODULE_DEPEND(ehci, usb, 1, 1, 1);
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