aw_usbphy.c revision 309760
1/*- 2 * Copyright (c) 2016 Jared McNeill <jmcneill@invisible.ca> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 17 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 19 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 20 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 21 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 22 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 * $FreeBSD: stable/11/sys/arm/allwinner/aw_usbphy.c 309760 2016-12-09 20:25:59Z manu $ 27 */ 28 29/* 30 * Allwinner USB PHY 31 */ 32 33#include <sys/cdefs.h> 34__FBSDID("$FreeBSD: stable/11/sys/arm/allwinner/aw_usbphy.c 309760 2016-12-09 20:25:59Z manu $"); 35 36#include <sys/param.h> 37#include <sys/systm.h> 38#include <sys/bus.h> 39#include <sys/rman.h> 40#include <sys/kernel.h> 41#include <sys/module.h> 42#include <sys/gpio.h> 43 44#include <dev/ofw/ofw_bus.h> 45#include <dev/ofw/ofw_bus_subr.h> 46#include <dev/gpio/gpiobusvar.h> 47 48#include <dev/extres/clk/clk.h> 49#include <dev/extres/hwreset/hwreset.h> 50#include <dev/extres/regulator/regulator.h> 51#include <dev/extres/phy/phy.h> 52 53#include "phy_if.h" 54 55#define USBPHY_NPHYS 4 56 57static struct ofw_compat_data compat_data[] = { 58 { "allwinner,sun4i-a10-usb-phy", 1 }, 59 { "allwinner,sun5i-a13-usb-phy", 1 }, 60 { "allwinner,sun6i-a31-usb-phy", 1 }, 61 { "allwinner,sun7i-a20-usb-phy", 1 }, 62 { "allwinner,sun8i-a83t-usb-phy", 1 }, 63 { "allwinner,sun8i-h3-usb-phy", 1 }, 64 { NULL, 0 } 65}; 66 67struct awusbphy_softc { 68 regulator_t reg[USBPHY_NPHYS]; 69 gpio_pin_t id_det_pin; 70 int id_det_valid; 71 gpio_pin_t vbus_det_pin; 72 int vbus_det_valid; 73}; 74 75static int 76awusbphy_init(device_t dev) 77{ 78 struct awusbphy_softc *sc; 79 phandle_t node; 80 char pname[20]; 81 int error, off; 82 regulator_t reg; 83 hwreset_t rst; 84 clk_t clk; 85 86 sc = device_get_softc(dev); 87 node = ofw_bus_get_node(dev); 88 89 /* Enable clocks */ 90 for (off = 0; clk_get_by_ofw_index(dev, 0, off, &clk) == 0; off++) { 91 error = clk_enable(clk); 92 if (error != 0) { 93 device_printf(dev, "couldn't enable clock %s\n", 94 clk_get_name(clk)); 95 return (error); 96 } 97 } 98 99 /* De-assert resets */ 100 for (off = 0; hwreset_get_by_ofw_idx(dev, 0, off, &rst) == 0; off++) { 101 error = hwreset_deassert(rst); 102 if (error != 0) { 103 device_printf(dev, "couldn't de-assert reset %d\n", 104 off); 105 return (error); 106 } 107 } 108 109 /* Get regulators */ 110 for (off = 0; off < USBPHY_NPHYS; off++) { 111 snprintf(pname, sizeof(pname), "usb%d_vbus-supply", off); 112 if (regulator_get_by_ofw_property(dev, 0, pname, ®) == 0) 113 sc->reg[off] = reg; 114 } 115 116 /* Get GPIOs */ 117 error = gpio_pin_get_by_ofw_property(dev, node, "usb0_id_det-gpios", 118 &sc->id_det_pin); 119 if (error == 0) 120 sc->id_det_valid = 1; 121 error = gpio_pin_get_by_ofw_property(dev, node, "usb0_vbus_det-gpios", 122 &sc->vbus_det_pin); 123 if (error == 0) 124 sc->vbus_det_valid = 1; 125 126 return (0); 127} 128 129static int 130awusbphy_vbus_detect(device_t dev, int *val) 131{ 132 struct awusbphy_softc *sc; 133 bool active; 134 int error; 135 136 sc = device_get_softc(dev); 137 138 if (sc->vbus_det_valid) { 139 error = gpio_pin_is_active(sc->vbus_det_pin, &active); 140 if (error != 0) 141 return (error); 142 *val = active; 143 return (0); 144 } 145 146 *val = 1; 147 return (0); 148} 149 150static int 151awusbphy_phy_enable(device_t dev, intptr_t phy, bool enable) 152{ 153 struct awusbphy_softc *sc; 154 regulator_t reg; 155 int error, vbus_det; 156 157 if (phy < 0 || phy >= USBPHY_NPHYS) 158 return (ERANGE); 159 160 sc = device_get_softc(dev); 161 162 /* Regulators are optional. If not found, return success. */ 163 reg = sc->reg[phy]; 164 if (reg == NULL) 165 return (0); 166 167 if (enable) { 168 /* If an external vbus is detected, do not enable phy 0 */ 169 if (phy == 0) { 170 error = awusbphy_vbus_detect(dev, &vbus_det); 171 if (error == 0 && vbus_det == 1) 172 return (0); 173 } else 174 error = 0; 175 if (error == 0) 176 error = regulator_enable(reg); 177 } else 178 error = regulator_disable(reg); 179 if (error != 0) { 180 device_printf(dev, 181 "couldn't %s regulator for phy %jd\n", 182 enable ? "enable" : "disable", (intmax_t)phy); 183 return (error); 184 } 185 186 return (0); 187} 188 189static int 190awusbphy_probe(device_t dev) 191{ 192 if (!ofw_bus_status_okay(dev)) 193 return (ENXIO); 194 195 if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0) 196 return (ENXIO); 197 198 device_set_desc(dev, "Allwinner USB PHY"); 199 return (BUS_PROBE_DEFAULT); 200} 201 202static int 203awusbphy_attach(device_t dev) 204{ 205 int error; 206 207 error = awusbphy_init(dev); 208 if (error) { 209 device_printf(dev, "failed to initialize USB PHY, error %d\n", 210 error); 211 return (error); 212 } 213 214 phy_register_provider(dev); 215 216 return (error); 217} 218 219static device_method_t awusbphy_methods[] = { 220 /* Device interface */ 221 DEVMETHOD(device_probe, awusbphy_probe), 222 DEVMETHOD(device_attach, awusbphy_attach), 223 224 /* PHY interface */ 225 DEVMETHOD(phy_enable, awusbphy_phy_enable), 226 227 DEVMETHOD_END 228}; 229 230static driver_t awusbphy_driver = { 231 "awusbphy", 232 awusbphy_methods, 233 sizeof(struct awusbphy_softc) 234}; 235 236static devclass_t awusbphy_devclass; 237 238EARLY_DRIVER_MODULE(awusbphy, simplebus, awusbphy_driver, awusbphy_devclass, 239 0, 0, BUS_PASS_RESOURCE + BUS_PASS_ORDER_MIDDLE); 240MODULE_VERSION(awusbphy, 1); 241