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freebsd-skq/sys/arm/samsung/exynos/exynos5_xhci.c
Hans Petter Selasky d3bf5efc1f Fix device delete child function. 
When detaching device trees parent devices must be detached prior to
detaching its children. This is because parent devices can have
pointers to the child devices in their softcs which are not
invalidated by device_delete_child(). This can cause use after free
issues and panic().

Device drivers implementing trees, must ensure its detach function
detaches or deletes all its children before returning.

While at it remove now redundant device_detach() calls before
device_delete_child() and device_delete_children(), mostly in
the USB controller drivers.

Tested by:		Jan Henrik Sylvester <me@janh.de>
Reviewed by:		jhb
Differential Revision:	https://reviews.freebsd.org/D8070
MFC after:		2 weeks
2016-10-17 10:20:38 +00:00

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/*-
* Copyright (c) 2014 Ruslan Bukin <br@bsdpad.com>
* 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("$FreeBSD$");
#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/condvar.h>
#include <sys/rman.h>
#include <dev/ofw/ofw_bus.h>
#include <dev/ofw/ofw_bus_subr.h>
#include <dev/usb/usb.h>
#include <dev/usb/usbdi.h>
#include <dev/usb/usb_busdma.h>
#include <dev/usb/usb_process.h>
#include <dev/usb/usb_controller.h>
#include <dev/usb/usb_bus.h>
#include <dev/usb/controller/xhci.h>
#include <dev/usb/controller/xhcireg.h>
#include <machine/bus.h>
#include <machine/resource.h>
#include <arm/samsung/exynos/exynos5_common.h>
#include "opt_platform.h"
#define GSNPSID 0x20
#define GSNPSID_MASK 0xffff0000
#define REVISION_MASK 0xffff
#define GCTL 0x10
#define GCTL_PWRDNSCALE(n) ((n) << 19)
#define GCTL_U2RSTECN (1 << 16)
#define GCTL_CLK_BUS (0)
#define GCTL_CLK_PIPE (1)
#define GCTL_CLK_PIPEHALF (2)
#define GCTL_CLK_M (3)
#define GCTL_CLK_S (6)
#define GCTL_PRTCAP(n) (((n) & (3 << 12)) >> 12)
#define GCTL_PRTCAPDIR(n) ((n) << 12)
#define GCTL_PRTCAP_HOST 1
#define GCTL_PRTCAP_DEVICE 2
#define GCTL_PRTCAP_OTG 3
#define GCTL_CORESOFTRESET (1 << 11)
#define GCTL_SCALEDOWN_MASK 3
#define GCTL_SCALEDOWN_SHIFT 4
#define GCTL_DISSCRAMBLE (1 << 3)
#define GCTL_DSBLCLKGTNG (1 << 0)
#define GHWPARAMS1 0x3c
#define GHWPARAMS1_EN_PWROPT(n) (((n) & (3 << 24)) >> 24)
#define GHWPARAMS1_EN_PWROPT_NO 0
#define GHWPARAMS1_EN_PWROPT_CLK 1
#define GUSB2PHYCFG(n) (0x100 + (n * 0x04))
#define GUSB2PHYCFG_PHYSOFTRST (1 << 31)
#define GUSB2PHYCFG_SUSPHY (1 << 6)
#define GUSB3PIPECTL(n) (0x1c0 + (n * 0x04))
#define GUSB3PIPECTL_PHYSOFTRST (1 << 31)
#define GUSB3PIPECTL_SUSPHY (1 << 17)
/* Forward declarations */
static device_attach_t exynos_xhci_attach;
static device_detach_t exynos_xhci_detach;
static device_probe_t exynos_xhci_probe;
struct exynos_xhci_softc {
device_t dev;
struct xhci_softc base;
struct resource *res[3];
bus_space_tag_t bst;
bus_space_handle_t bsh;
};
static struct resource_spec exynos_xhci_spec[] = {
{ SYS_RES_MEMORY, 0, RF_ACTIVE },
{ SYS_RES_MEMORY, 1, RF_ACTIVE },
{ SYS_RES_IRQ, 0, RF_ACTIVE },
{ -1, 0 }
};
static device_method_t xhci_methods[] = {
/* Device interface */
DEVMETHOD(device_probe, exynos_xhci_probe),
DEVMETHOD(device_attach, exynos_xhci_attach),
DEVMETHOD(device_detach, exynos_xhci_detach),
DEVMETHOD(device_suspend, bus_generic_suspend),
DEVMETHOD(device_resume, bus_generic_resume),
DEVMETHOD(device_shutdown, bus_generic_shutdown),
DEVMETHOD_END
};
/* kobj_class definition */
static driver_t xhci_driver = {
"xhci",
xhci_methods,
sizeof(struct xhci_softc)
};
static devclass_t xhci_devclass;
DRIVER_MODULE(xhci, simplebus, xhci_driver, xhci_devclass, 0, 0);
MODULE_DEPEND(xhci, usb, 1, 1, 1);
/*
* Public methods
*/
static int
exynos_xhci_probe(device_t dev)
{
if (!ofw_bus_status_okay(dev))
return (ENXIO);
if (ofw_bus_is_compatible(dev, "samsung,exynos5250-dwusb3") == 0)
return (ENXIO);
device_set_desc(dev, "Exynos USB 3.0 controller");
return (BUS_PROBE_DEFAULT);
}
static int
dwc3_init(struct exynos_xhci_softc *esc)
{
int hwparams1;
int rev;
int reg;
rev = READ4(esc, GSNPSID);
if ((rev & GSNPSID_MASK) != 0x55330000) {
printf("It is not DWC3 controller\n");
return (-1);
}
/* Reset controller */
WRITE4(esc, GCTL, GCTL_CORESOFTRESET);
WRITE4(esc, GUSB3PIPECTL(0), GUSB3PIPECTL_PHYSOFTRST);
WRITE4(esc, GUSB2PHYCFG(0), GUSB2PHYCFG_PHYSOFTRST);
DELAY(100000);
reg = READ4(esc, GUSB3PIPECTL(0));
reg &= ~(GUSB3PIPECTL_PHYSOFTRST);
WRITE4(esc, GUSB3PIPECTL(0), reg);
reg = READ4(esc, GUSB2PHYCFG(0));
reg &= ~(GUSB2PHYCFG_PHYSOFTRST);
WRITE4(esc, GUSB2PHYCFG(0), reg);
reg = READ4(esc, GCTL);
reg &= ~GCTL_CORESOFTRESET;
WRITE4(esc, GCTL, reg);
hwparams1 = READ4(esc, GHWPARAMS1);
reg = READ4(esc, GCTL);
reg &= ~(GCTL_SCALEDOWN_MASK << GCTL_SCALEDOWN_SHIFT);
reg &= ~(GCTL_DISSCRAMBLE);
if (GHWPARAMS1_EN_PWROPT(hwparams1) == \
GHWPARAMS1_EN_PWROPT_CLK)
reg &= ~(GCTL_DSBLCLKGTNG);
if ((rev & REVISION_MASK) < 0x190a)
reg |= (GCTL_U2RSTECN);
WRITE4(esc, GCTL, reg);
/* Set host mode */
reg = READ4(esc, GCTL);
reg &= ~(GCTL_PRTCAPDIR(GCTL_PRTCAP_OTG));
reg |= GCTL_PRTCAPDIR(GCTL_PRTCAP_HOST);
WRITE4(esc, GCTL, reg);
return (0);
}
static int
exynos_xhci_attach(device_t dev)
{
struct exynos_xhci_softc *esc = device_get_softc(dev);
bus_space_handle_t bsh;
int err;
esc->dev = dev;
if (bus_alloc_resources(dev, exynos_xhci_spec, esc->res)) {
device_printf(dev, "could not allocate resources\n");
return (ENXIO);
}
/* XHCI registers */
esc->base.sc_io_tag = rman_get_bustag(esc->res[0]);
bsh = rman_get_bushandle(esc->res[0]);
esc->base.sc_io_size = rman_get_size(esc->res[0]);
/* DWC3 ctrl registers */
esc->bst = rman_get_bustag(esc->res[1]);
esc->bsh = rman_get_bushandle(esc->res[1]);
/*
* Set handle to USB related registers subregion used by
* generic XHCI driver.
*/
err = bus_space_subregion(esc->base.sc_io_tag, bsh, 0x0,
esc->base.sc_io_size, &esc->base.sc_io_hdl);
if (err != 0) {
device_printf(dev, "Subregion failed\n");
bus_release_resources(dev, exynos_xhci_spec, esc->res);
return (ENXIO);
}
if (xhci_init(&esc->base, dev, 0)) {
device_printf(dev, "Could not initialize softc\n");
bus_release_resources(dev, exynos_xhci_spec, esc->res);
return (ENXIO);
}
/* Setup interrupt handler */
err = bus_setup_intr(dev, esc->res[2], INTR_TYPE_BIO | INTR_MPSAFE,
NULL, (driver_intr_t *)xhci_interrupt, &esc->base,
&esc->base.sc_intr_hdl);
if (err) {
device_printf(dev, "Could not setup irq, %d\n", err);
esc->base.sc_intr_hdl = NULL;
goto error;
}
/* Add USB device */
esc->base.sc_bus.bdev = device_add_child(dev, "usbus", -1);
if (esc->base.sc_bus.bdev == NULL) {
device_printf(dev, "Could not add USB device\n");
goto error;
}
device_set_ivars(esc->base.sc_bus.bdev, &esc->base.sc_bus);
strlcpy(esc->base.sc_vendor, "Samsung", sizeof(esc->base.sc_vendor));
dwc3_init(esc);
err = xhci_halt_controller(&esc->base);
if (err == 0) {
device_printf(dev, "Starting controller\n");
err = xhci_start_controller(&esc->base);
}
if (err == 0) {
device_printf(dev, "Controller started\n");
err = device_probe_and_attach(esc->base.sc_bus.bdev);
}
if (err != 0)
goto error;
return (0);
error:
exynos_xhci_detach(dev);
return (ENXIO);
}
static int
exynos_xhci_detach(device_t dev)
{
struct exynos_xhci_softc *esc = device_get_softc(dev);
int err;
/* During module unload there are lots of children leftover */
device_delete_children(dev);
xhci_halt_controller(&esc->base);
if (esc->res[2] && esc->base.sc_intr_hdl) {
err = bus_teardown_intr(dev, esc->res[2],
esc->base.sc_intr_hdl);
if (err) {
device_printf(dev, "Could not tear down IRQ,"
" %d\n", err);
return (err);
}
}
bus_release_resources(dev, exynos_xhci_spec, esc->res);
xhci_uninit(&esc->base);
return (0);
}
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