1/* $NetBSD: mesongxl_usb2phy.c,v 1.2 2021/01/27 03:10:18 thorpej Exp $ */ 2 3/*- 4 * Copyright (c) 2019 Jared McNeill <jmcneill@invisible.ca> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 17 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 18 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 19 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 20 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 26 * POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29#include <sys/cdefs.h> 30 31__KERNEL_RCSID(0, "$NetBSD: mesongxl_usb2phy.c,v 1.2 2021/01/27 03:10:18 thorpej Exp $"); 32 33#include <sys/param.h> 34#include <sys/bus.h> 35#include <sys/device.h> 36#include <sys/intr.h> 37#include <sys/systm.h> 38#include <sys/time.h> 39 40#include <dev/fdt/fdtvar.h> 41 42#define USB2PHY_REG0 0x00 43#define REG0_POWER_ON_RESET __BIT(22) 44#define REG0_ID_PULLUP __BIT(13) 45#define REG0_DP_PULLDOWN __BIT(6) 46#define REG0_DM_PULLDOWN __BIT(5) 47 48static int mesongxl_usb2phy_match(device_t, cfdata_t, void *); 49static void mesongxl_usb2phy_attach(device_t, device_t, void *); 50 51static const struct device_compatible_entry compat_data[] = { 52 { .compat = "amlogic,meson-gxl-usb2-phy" }, 53 DEVICE_COMPAT_EOL 54}; 55 56struct mesongxl_usb2phy_softc { 57 device_t sc_dev; 58 bus_space_tag_t sc_bst; 59 bus_space_handle_t sc_bsh; 60 int sc_phandle; 61 struct clk *sc_clk; 62 struct fdtbus_reset *sc_rst; 63 struct fdtbus_regulator *sc_supply; 64}; 65 66#define PHY_READ(sc, reg) \ 67 bus_space_read_4((sc)->sc_bst, (sc)->sc_bsh, (reg)) 68#define PHY_WRITE(sc, reg, val) \ 69 bus_space_write_4((sc)->sc_bst, (sc)->sc_bsh, (reg), (val)) 70 71CFATTACH_DECL_NEW(mesongxl_usb2phy, sizeof(struct mesongxl_usb2phy_softc), 72 mesongxl_usb2phy_match, mesongxl_usb2phy_attach, NULL, NULL); 73 74static void * 75mesongxl_usb2phy_acquire(device_t dev, const void *data, size_t len) 76{ 77 if (len != 0) 78 return NULL; 79 80 return (void *)(uintptr_t)1; 81} 82 83static void 84mesongxl_usb2phy_release(device_t dev, void *priv) 85{ 86} 87 88static int 89mesongxl_usb2phy_enable(device_t dev, void *priv, bool enable) 90{ 91 struct mesongxl_usb2phy_softc * const sc = device_private(dev); 92 uint32_t val; 93 94 if (enable) { 95 /* Power on PHY */ 96 val = PHY_READ(sc, USB2PHY_REG0); 97 val &= ~REG0_POWER_ON_RESET; 98 PHY_WRITE(sc, USB2PHY_REG0, val); 99 100 /* Configure PHY for host mode */ 101 val = PHY_READ(sc, USB2PHY_REG0); 102 val |= REG0_DM_PULLDOWN; 103 val |= REG0_DP_PULLDOWN; 104 val &= ~REG0_ID_PULLUP; 105 PHY_WRITE(sc, USB2PHY_REG0, val); 106 107 /* Reset the PHY */ 108 val = PHY_READ(sc, USB2PHY_REG0); 109 val |= REG0_POWER_ON_RESET; 110 PHY_WRITE(sc, USB2PHY_REG0, val); 111 delay(500); 112 val = PHY_READ(sc, USB2PHY_REG0); 113 val &= ~REG0_POWER_ON_RESET; 114 PHY_WRITE(sc, USB2PHY_REG0, val); 115 delay(500); 116 117 if (sc->sc_supply != NULL) { 118 if (fdtbus_regulator_enable(sc->sc_supply) != 0) 119 aprint_error(": couldn't enable supply\n"); 120 } 121 } else { 122 /* Power off PHY */ 123 val = PHY_READ(sc, USB2PHY_REG0); 124 val |= REG0_POWER_ON_RESET; 125 PHY_WRITE(sc, USB2PHY_REG0, val); 126 } 127 128 return 0; 129} 130 131const struct fdtbus_phy_controller_func mesongxl_usb2phy_funcs = { 132 .acquire = mesongxl_usb2phy_acquire, 133 .release = mesongxl_usb2phy_release, 134 .enable = mesongxl_usb2phy_enable, 135}; 136 137static int 138mesongxl_usb2phy_match(device_t parent, cfdata_t cf, void *aux) 139{ 140 struct fdt_attach_args * const faa = aux; 141 142 return of_compatible_match(faa->faa_phandle, compat_data); 143} 144 145static void 146mesongxl_usb2phy_attach(device_t parent, device_t self, void *aux) 147{ 148 struct mesongxl_usb2phy_softc * const sc = device_private(self); 149 struct fdt_attach_args * const faa = aux; 150 const int phandle = faa->faa_phandle; 151 bus_addr_t addr; 152 bus_size_t size; 153 154 sc->sc_dev = self; 155 sc->sc_bst = faa->faa_bst; 156 sc->sc_phandle = phandle; 157 158 if (fdtbus_get_reg(phandle, 0, &addr, &size) != 0) { 159 aprint_error(": couldn't get registers\n"); 160 return; 161 } 162 if (bus_space_map(sc->sc_bst, addr, size, 0, &sc->sc_bsh) != 0) { 163 aprint_error(": couldn't map registers\n"); 164 return; 165 } 166 167 sc->sc_clk = fdtbus_clock_get_index(phandle, 0); 168 if (sc->sc_clk == NULL) { 169 aprint_error(": couldn't get clock\n"); 170 return; 171 } 172 sc->sc_rst = fdtbus_reset_get_index(phandle, 0); 173 174 if (sc->sc_rst != NULL) { 175 if (fdtbus_reset_deassert(sc->sc_rst) != 0) { 176 aprint_error(": couldn't de-assert reset\n"); 177 return; 178 } 179 } 180 if (clk_enable(sc->sc_clk) != 0) { 181 aprint_error(": couldn't enable clock\n"); 182 return; 183 } 184 185 sc->sc_supply = fdtbus_regulator_acquire(phandle, "phy-supply"); 186 187 aprint_naive("\n"); 188 aprint_normal(": USB2 PHY\n"); 189 190 fdtbus_register_phy_controller(self, phandle, &mesongxl_usb2phy_funcs); 191} 192