1 files changed, 324 insertions, 0 deletions
diff --git a/sys/mips/mediatek/mtk_usb_phy.c b/sys/mips/mediatek/mtk_usb_phy.c
new file mode 100644
index 0000000..d400720
--- /dev/null
+++ b/sys/mips/mediatek/mtk_usb_phy.c
@@ -0,0 +1,324 @@
+/*-
+ * Copyright (c) 2016 Stanislav Galabov.
+ * 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 ``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 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 <sys/stddef.h>
+#include <sys/param.h>
+#include <sys/types.h>
+#include <sys/kernel.h>
+#include <sys/bus.h>
+#include <sys/module.h>
+
+#include <machine/bus.h>
+
+#include <dev/fdt/fdt_common.h>
+#include <dev/fdt/fdt_clock.h>
+#include <mips/mediatek/fdt_reset.h>
+#include <dev/ofw/ofw_bus.h>
+#include <dev/ofw/ofw_bus_subr.h>
+
+#include <mips/mediatek/mtk_sysctl.h>
+#include <mips/mediatek/mtk_soc.h>
+#include <mips/mediatek/mtk_usb_phy.h>
+
+#define RESET_ASSERT_DELAY	1000
+#define RESET_DEASSERT_DELAY	10000
+
+struct mtk_usb_phy_softc {
+	device_t		dev;
+	struct resource *	res;
+	uint32_t		fm_base;
+	uint32_t		u2_base;
+	uint32_t		sr_coef;
+	uint32_t		socid;
+};
+
+#define USB_PHY_READ(_sc, _off)		bus_read_4((_sc)->res, (_off))
+#define USB_PHY_WRITE(_sc, _off, _val)	bus_write_4((_sc)->res, (_off), (_val))
+#define USB_PHY_CLR_SET(_sc, _off, _clr, _set)	\
+	USB_PHY_WRITE(_sc, _off, ((USB_PHY_READ(_sc, _off) & ~(_clr)) | (_set)))
+
+#define USB_PHY_READ_U2(_sc, _off)			\
+	USB_PHY_READ((_sc), ((_sc)->u2_base + (_off)))
+#define USB_PHY_WRITE_U2(_sc, _off, _val)		\
+	USB_PHY_WRITE((_sc), ((_sc)->u2_base + (_off)), (_val))
+#define USB_PHY_CLR_SET_U2(_sc, _off, _clr, _set)	\
+	USB_PHY_WRITE_U2((_sc), (_off), ((USB_PHY_READ_U2((_sc), (_off)) & \
+	    ~(_clr)) | (_set)))
+#define USB_PHY_BARRIER(_sc)	bus_barrier((_sc)->res, 0, 0, \
+			BUS_SPACE_BARRIER_WRITE | BUS_SPACE_BARRIER_READ)
+
+#define USB_PHY_READ_FM(_sc, _off)			\
+	USB_PHY_READ((_sc), ((_sc)->fm_base + (_off)))
+#define USB_PHY_WRITE_FM(_sc, _off)			\
+	USB_PHY_WRITE((_sc), ((_sc)->fm_base + (_off)), (_val))
+#define USB_PHY_CLR_SET_FM(_sc, _off, _clr, _set)	\
+	USB_PHY_WRITE_U2((_sc), (_off), ((USB_PHY_READ_U2((_sc), (_off)) & \
+	    ~(_clr)) | (_set)))
+
+static void mtk_usb_phy_mt7621_init(device_t);
+static void mtk_usb_phy_mt7628_init(device_t);
+
+static struct ofw_compat_data compat_data[] = {
+	{ "ralink,mt7620a-usbphy",	MTK_SOC_MT7620A },
+	{ "ralink,mt7628an-usbphy",	MTK_SOC_MT7628 },
+	{ "ralink,rt3xxx-usbphy",	MTK_SOC_RT3352 },
+	{ NULL,				MTK_SOC_UNKNOWN }
+};
+
+static int
+mtk_usb_phy_probe(device_t dev)
+{
+	struct mtk_usb_phy_softc *sc = device_get_softc(dev);
+
+	if (!ofw_bus_status_okay(dev))
+		return (ENXIO);
+	if ((sc->socid =
+	    ofw_bus_search_compatible(dev, compat_data)->ocd_data) ==
+	    MTK_SOC_UNKNOWN)
+		return (ENXIO);
+
+	device_set_desc(dev, "MTK USB PHY");
+
+	return (0);
+}
+
+static int
+mtk_usb_phy_attach(device_t dev)
+{
+	struct mtk_usb_phy_softc * sc = device_get_softc(dev);
+	phandle_t node;
+	uint32_t val;
+	int rid;
+
+	sc->dev = dev;
+
+	/* Get our FDT node and SoC id */
+	node = ofw_bus_get_node(dev);
+
+	/* Now let's see about setting USB to host or device mode */
+	/* XXX: is it the same for all SoCs? */
+	val = mtk_sysctl_get(SYSCTL_SYSCFG1);
+	if (OF_hasprop(node, "mtk,usb-device"))
+		val &= ~SYSCFG1_USB_HOST_MODE;
+	else
+		val |= SYSCFG1_USB_HOST_MODE;
+	mtk_sysctl_set(SYSCTL_SYSCFG1, val);
+
+	/* If we have clocks defined - enable them */
+	if (OF_hasprop(node, "clocks"))
+		fdt_clock_enable_all(dev);
+
+	/* If we have resets defined - perform a reset sequence */
+	if (OF_hasprop(node, "resets")) {
+		fdt_reset_assert_all(dev);
+		DELAY(RESET_ASSERT_DELAY);
+		fdt_reset_deassert_all(dev);
+		DELAY(RESET_DEASSERT_DELAY);
+	}
+
+	/* Careful, some devices actually require resources */
+	if (OF_hasprop(node, "reg")) {
+		rid = 0;
+		sc->res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid,
+		    RF_ACTIVE);
+		if (sc->res == NULL) {
+			device_printf(dev, "could not map memory\n");
+			return (ENXIO);
+		}
+	} else {
+		sc->res = NULL;
+	}
+
+	/* Some SoCs require specific USB PHY init... handle these */
+	switch (sc->socid) {
+	case MTK_SOC_MT7628: /* Fallthrough */
+	case MTK_SOC_MT7688:
+		if (sc->res == NULL)
+			return (ENXIO);
+		sc->fm_base = MT7628_FM_FEG_BASE;
+		sc->u2_base = MT7628_U2_BASE;
+		sc->sr_coef = MT7628_SR_COEF;
+		mtk_usb_phy_mt7628_init(dev);
+		break;
+	case MTK_SOC_MT7621:
+		if (sc->res == NULL)
+			return (ENXIO);
+		sc->fm_base = MT7621_FM_FEG_BASE;
+		sc->u2_base = MT7621_U2_BASE;
+		sc->sr_coef = MT7621_SR_COEF;
+		mtk_usb_phy_mt7621_init(dev);
+		break;
+	}
+
+	/* We no longer need the resources, release them */
+	if (sc->res != NULL)
+		bus_release_resource(dev, SYS_RES_MEMORY, 0, sc->res);
+
+	return (0);
+}
+
+static int
+mtk_usb_phy_detach(device_t dev)
+{
+	struct mtk_usb_phy_softc *sc = device_get_softc(dev);
+	phandle_t node;
+
+	/* Get our FDT node */
+	node = ofw_bus_get_node(dev);
+
+	/* If we have resets defined - assert them */
+	if (OF_hasprop(node, "resets"))
+		fdt_reset_assert_all(dev);
+
+	/* If we have clocks defined - disable them */
+	if (OF_hasprop(node, "clocks"))
+		fdt_clock_disable_all(dev);
+
+	/* Finally, release resources, if any were allocated */
+	if (sc->res != NULL)
+		bus_release_resource(dev, SYS_RES_MEMORY, 0, sc->res);
+
+	return (0);
+}
+
+/*
+ * Things currently seem to work a lot better without slew rate calibration
+ * both on MT7621 and MT7688, so we leave it out for now.
+ */
+#ifdef notyet
+static void
+mtk_usb_phy_slew_rate_calibration(struct mtk_usb_phy_softc *sc)
+{
+	uint32_t val;
+	int i;
+
+	USB_PHY_CLR_SET_U2(sc, U2_PHY_ACR0, 0, SRCAL_EN);
+	USB_PHY_BARRIER(sc);
+	DELAY(1000);
+
+	USB_PHY_CLR_SET_FM(sc, U2_PHY_FMMONR1, 0, FRCK_EN);
+	USB_PHY_BARRIER(sc);
+	USB_PHY_CLR_SET_FM(sc, U2_PHY_FMCR0, CYCLECNT, 0x400);
+	USB_PHY_BARRIER(sc);
+	USB_PHY_CLR_SET_FM(sc, U2_PHY_FMCR0, 0, FDET_EN);
+	USB_PHY_BARRIER(sc);
+
+	for (i = 0; i < 1000; i++) {
+		if ((val = USB_PHY_READ_FM(sc, U2_PHY_FMMONR0)) != 0) {
+			device_printf(sc->dev, "DONE with FDET\n");
+			break;
+		}
+		DELAY(10000);
+	}
+	device_printf(sc->dev, "After FDET\n");
+
+	USB_PHY_CLR_SET_FM(sc, U2_PHY_FMCR0, FDET_EN, 0);
+	USB_PHY_BARRIER(sc);
+	USB_PHY_CLR_SET_FM(sc, U2_PHY_FMMONR1, FRCK_EN, 0);
+	USB_PHY_BARRIER(sc);
+	USB_PHY_CLR_SET_U2(sc, U2_PHY_ACR0, SRCAL_EN, 0);
+	USB_PHY_BARRIER(sc);
+	DELAY(1000);
+
+	if (val == 0) {
+		USB_PHY_CLR_SET_U2(sc, U2_PHY_ACR0, SRCTRL, 0x4 << SRCTRL_OFF);
+		USB_PHY_BARRIER(sc);
+	} else {
+		val = ((((1024 * 25 * sc->sr_coef) / val) + 500) / 1000) &
+		    SRCTRL_MSK;
+		USB_PHY_CLR_SET_U2(sc, U2_PHY_ACR0, SRCTRL, val << SRCTRL_OFF);
+		USB_PHY_BARRIER(sc);
+	}
+}
+#endif
+
+static void
+mtk_usb_phy_mt7621_init(device_t dev)
+{
+#ifdef notyet
+	struct mtk_usb_phy_softc *sc = device_get_softc(dev);
+
+	/* Slew rate calibration only, but for 2 ports */
+	mtk_usb_phy_slew_rate_calibration(sc);
+
+	sc->u2_base = MT7621_U2_BASE_P1;
+	mtk_usb_phy_slew_rate_calibration(sc);
+#endif
+}
+
+static void
+mtk_usb_phy_mt7628_init(device_t dev)
+{
+	struct mtk_usb_phy_softc *sc = device_get_softc(dev);
+
+	/* XXX: possibly add barriers between the next writes? */
+	USB_PHY_WRITE_U2(sc, U2_PHY_DCR0, 0x00ffff02);
+	USB_PHY_BARRIER(sc);
+	USB_PHY_WRITE_U2(sc, U2_PHY_DCR0, 0x00555502);
+	USB_PHY_BARRIER(sc);
+	USB_PHY_WRITE_U2(sc, U2_PHY_DCR0, 0x00aaaa02);
+	USB_PHY_BARRIER(sc);
+	USB_PHY_WRITE_U2(sc, U2_PHY_DCR0, 0x00000402);
+	USB_PHY_BARRIER(sc);
+	USB_PHY_WRITE_U2(sc,  U2_PHY_AC0, 0x0048086a);
+	USB_PHY_BARRIER(sc);
+	USB_PHY_WRITE_U2(sc,  U2_PHY_AC1, 0x4400001c);
+	USB_PHY_BARRIER(sc);
+	USB_PHY_WRITE_U2(sc, U2_PHY_ACR3, 0xc0200000);
+	USB_PHY_BARRIER(sc);
+	USB_PHY_WRITE_U2(sc, U2_PHY_DTM0, 0x02000000);
+	USB_PHY_BARRIER(sc);
+
+#ifdef notyet
+	/* Slew rate calibration */
+	mtk_usb_phy_slew_rate_calibration(sc);
+#endif
+}
+
+static device_method_t mtk_usb_phy_methods[] = {
+	/* Device interface */
+	DEVMETHOD(device_probe,		mtk_usb_phy_probe),
+	DEVMETHOD(device_attach,	mtk_usb_phy_attach),
+	DEVMETHOD(device_detach,	mtk_usb_phy_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_usb_phy_driver = {
+	.name = "usbphy",
+	.methods = mtk_usb_phy_methods,
+	.size = sizeof(struct mtk_usb_phy_softc),
+};
+
+static devclass_t mtk_usb_phy_devclass;
+
+DRIVER_MODULE(usbphy, simplebus, mtk_usb_phy_driver, mtk_usb_phy_devclass, 0,
+    0);