Differential D5841 Diff 14981 head/sys/mips/mediatek/mtk_usb_phy.c

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head/sys/mips/mediatek/mtk_usb_phy.c

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				/*-
				* 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);
				}

				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);
				}
				}

				static void
				mtk_usb_phy_mt7621_init(device_t dev)
				{
				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);
				}

				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);

				/* Slew rate calibration */
				//mtk_usb_phy_slew_rate_calibration(sc);
				}

				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);