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freebsd-skq/sys/mips/mediatek/mtk_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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#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
/*-
* Copyright (c) 2015 Stanislav Galabov. All rights reserved.
* Copyright (c) 2010,2011 Aleksandr Rybalko. All rights reserved.
* Copyright (c) 2007-2008 Hans Petter Selasky. 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/stdint.h>
#include <sys/stddef.h>
#include <sys/param.h>
#include <sys/queue.h>
#include <sys/types.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/bus.h>
#include <sys/module.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/condvar.h>
#include <sys/sysctl.h>
#include <sys/sx.h>
#include <sys/unistd.h>
#include <sys/callout.h>
#include <sys/malloc.h>
#include <sys/priv.h>
#include <sys/rman.h>
#include <dev/usb/usb.h>
#include <dev/usb/usbdi.h>
#include <dev/usb/usb_core.h>
#include <dev/usb/usb_busdma.h>
#include <dev/usb/usb_process.h>
#include <dev/usb/usb_util.h>
#include <dev/usb/usb_controller.h>
#include <dev/usb/usb_bus.h>
#include <dev/usb/controller/xhci.h>
#include <dev/ofw/openfirm.h>
#include <dev/ofw/ofw_bus.h>
#include <dev/ofw/ofw_bus_subr.h>
#define XHCI_HC_DEVSTR "MTK USB 3.0 controller"
static device_probe_t mtk_xhci_fdt_probe;
static device_attach_t mtk_xhci_fdt_attach;
static device_detach_t mtk_xhci_fdt_detach;
static void mtk_xhci_fdt_init(device_t dev);
static int
mtk_xhci_fdt_probe(device_t self)
{
if (!ofw_bus_status_okay(self))
return (ENXIO);
if (!ofw_bus_is_compatible(self, "mediatek,mt8173-xhci"))
return (ENXIO);
device_set_desc(self, XHCI_HC_DEVSTR);
return (BUS_PROBE_DEFAULT);
}
static int
mtk_xhci_fdt_attach(device_t self)
{
struct xhci_softc *sc = device_get_softc(self);
int err;
int rid;
/* initialise some bus fields */
sc->sc_bus.parent = self;
sc->sc_bus.devices = sc->sc_devices;
sc->sc_bus.devices_max = XHCI_MAX_DEVICES;
rid = 0;
sc->sc_io_res = bus_alloc_resource_any(self, SYS_RES_MEMORY, &rid,
RF_ACTIVE);
if (!sc->sc_io_res) {
device_printf(self, "Could not map memory\n");
goto error;
}
sc->sc_io_tag = rman_get_bustag(sc->sc_io_res);
sc->sc_io_hdl = rman_get_bushandle(sc->sc_io_res);
sc->sc_io_size = rman_get_size(sc->sc_io_res);
mtk_xhci_fdt_init(self);
rid = 0;
sc->sc_irq_res = bus_alloc_resource_any(self, SYS_RES_IRQ, &rid,
RF_SHAREABLE | RF_ACTIVE);
if (sc->sc_irq_res == NULL) {
device_printf(self, "Could not allocate irq\n");
goto error;
}
sc->sc_bus.bdev = device_add_child(self, "usbus", -1);
if (!(sc->sc_bus.bdev)) {
device_printf(self, "Could not add USB device\n");
goto error;
}
device_set_ivars(sc->sc_bus.bdev, &sc->sc_bus);
device_set_desc(sc->sc_bus.bdev, XHCI_HC_DEVSTR);
sprintf(sc->sc_vendor, "Mediatek");
err = bus_setup_intr(self, sc->sc_irq_res, INTR_TYPE_BIO | INTR_MPSAFE,
NULL, (driver_intr_t *)xhci_interrupt, sc, &sc->sc_intr_hdl);
if (err) {
device_printf(self, "Could not setup irq, %d\n", err);
sc->sc_intr_hdl = NULL;
goto error;
}
err = xhci_init(sc, self, 1);
if (err == 0)
err = xhci_halt_controller(sc);
if (err == 0)
err = xhci_start_controller(sc);
if (err == 0)
err = device_probe_and_attach(sc->sc_bus.bdev);
if (err) {
device_printf(self, "USB init failed err=%d\n", err);
goto error;
}
return (0);
error:
mtk_xhci_fdt_detach(self);
return (ENXIO);
}
static int
mtk_xhci_fdt_detach(device_t self)
{
struct xhci_softc *sc = device_get_softc(self);
int err;
/* during module unload there are lots of children leftover */
device_delete_children(self);
if (sc->sc_irq_res && sc->sc_intr_hdl) {
/*
* only call xhci_detach() after xhci_init()
*/
xhci_uninit(sc);
err = bus_teardown_intr(self, sc->sc_irq_res, sc->sc_intr_hdl);
if (err)
device_printf(self, "Could not tear down irq, %d\n",
err);
sc->sc_intr_hdl = NULL;
}
if (sc->sc_irq_res) {
bus_release_resource(self, SYS_RES_IRQ, 0,
sc->sc_irq_res);
sc->sc_irq_res = NULL;
}
if (sc->sc_io_res) {
bus_release_resource(self, SYS_RES_MEMORY, 0,
sc->sc_io_res);
sc->sc_io_res = NULL;
}
return (0);
}
static device_method_t mtk_xhci_fdt_methods[] = {
/* Device interface */
DEVMETHOD(device_probe, mtk_xhci_fdt_probe),
DEVMETHOD(device_attach, mtk_xhci_fdt_attach),
DEVMETHOD(device_detach, mtk_xhci_fdt_detach),
DEVMETHOD(device_suspend, bus_generic_suspend),
DEVMETHOD(device_resume, bus_generic_resume),
DEVMETHOD(device_shutdown, bus_generic_shutdown),
DEVMETHOD_END
};
static driver_t mtk_xhci_fdt_driver = {
.name = "xhci",
.methods = mtk_xhci_fdt_methods,
.size = sizeof(struct xhci_softc),
};
static devclass_t mtk_xhci_fdt_devclass;
DRIVER_MODULE(xhci, simplebus, mtk_xhci_fdt_driver, mtk_xhci_fdt_devclass, 0,
0);
#define USB_HDMA_CFG 0x950
#define USB_HDMA_CFG_MT7621_VAL 0x10E0E0C
#define U3_LTSSM_TIMING_PARAM3 0x2514
#define U3_LTSSM_TIMING_VAL 0x3E8012C
#define SYNC_HS_EOF 0x938
#define SYNC_HS_EOF_VAL 0x201F3
#define USB_IP_SPAR0 0x107C8
#define USB_IP_SPAR0_VAL 1
#define U2_PHY_BASE_P0 0x10800
#define U2_PHY_BASE_P1 0x11000
#define U2_PHYD_CR1 0x64
#define U2_PHYD_CR1_MASK (3<<18)
#define U2_PHYD_CR1_VAL (1<<18)
#define USB_IP_PW_CTRL 0x10700
#define USB_IP_PW_CTRL_1 0x10704
#define USB_IP_CAP 0x10724
#define USB_U3_CTRL(p) (0x10730 + ((p) * 0x08))
#define USB_U2_CTRL(p) (0x10750 + ((p) * 0x08))
#define USB_IP_SW_RST (1 << 0)
#define USB_IP_PDN (1 << 0)
#define USB_PORT_DIS (1 << 0)
#define USB_PORT_PDN (1 << 1)
#define U3_PORT_NUM(p) (p & 0xFF)
#define U2_PORT_NUM(p) ((p>>8) & 0xFF)
#define RD4(_sc, _reg) bus_read_4((_sc)->sc_io_res, (_reg))
#define WR4(_sc, _reg, _val) bus_write_4((_sc)->sc_io_res, (_reg), (_val))
#define CLRSET4(_sc, _reg, _clr, _set) \
WR4((_sc), (_reg), (RD4((_sc), (_reg)) & ~(_clr)) | (_set))
static void
mtk_xhci_fdt_init(device_t dev)
{
struct xhci_softc *sc;
uint32_t temp, u3_ports, u2_ports, i;
sc = device_get_softc(dev);
temp = RD4(sc, USB_IP_CAP);
u3_ports = U3_PORT_NUM(temp);
u2_ports = U2_PORT_NUM(temp);
device_printf(dev, "%d USB3 ports, %d USB2 ports\n",
u3_ports, u2_ports);
CLRSET4(sc, USB_IP_PW_CTRL, 0, USB_IP_SW_RST);
CLRSET4(sc, USB_IP_PW_CTRL, USB_IP_SW_RST, 0);
CLRSET4(sc, USB_IP_PW_CTRL_1, USB_IP_PDN, 0);
for (i = 0; i < u3_ports; i++)
CLRSET4(sc, USB_U3_CTRL(i), USB_PORT_PDN | USB_PORT_DIS, 0);
for (i = 0; i < u2_ports; i++)
CLRSET4(sc, USB_U2_CTRL(i), USB_PORT_PDN | USB_PORT_DIS, 0);
DELAY(100000);
WR4(sc, USB_HDMA_CFG, USB_HDMA_CFG_MT7621_VAL);
WR4(sc, U3_LTSSM_TIMING_PARAM3, U3_LTSSM_TIMING_VAL);
WR4(sc, SYNC_HS_EOF, SYNC_HS_EOF_VAL);
WR4(sc, USB_IP_SPAR0, USB_IP_SPAR0_VAL);
CLRSET4(sc, U2_PHY_BASE_P0 + U2_PHYD_CR1, U2_PHYD_CR1_MASK,
U2_PHYD_CR1_VAL);
CLRSET4(sc, U2_PHY_BASE_P1 + U2_PHYD_CR1, U2_PHYD_CR1_MASK,
U2_PHYD_CR1_VAL);
}
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