1 /* $NetBSD: imx6_usbphy.c,v 1.2 2021/01/27 03:10:20 thorpej Exp $ */ 2 3 /*- 4 * Copyright (c) 2019 Genetec Corporation. All rights reserved. 5 * Written by Hashimoto Kenichi for Genetec Corporation. 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 AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 22 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 __KERNEL_RCSID(1, "$NetBSD: imx6_usbphy.c,v 1.2 2021/01/27 03:10:20 thorpej Exp $"); 31 32 #include "opt_fdt.h" 33 34 #include "locators.h" 35 #include "ohci.h" 36 #include "ehci.h" 37 38 #include <sys/param.h> 39 #include <sys/bus.h> 40 #include <sys/device.h> 41 42 #include <arm/nxp/imx6_usbphyreg.h> 43 44 #include <dev/fdt/fdtvar.h> 45 46 struct imx6_usbphy_softc { 47 device_t sc_dev; 48 49 bus_space_tag_t sc_iot; 50 bus_space_handle_t sc_ioh; 51 52 struct clk *sc_clk; 53 }; 54 55 static int imx6_usbphy_match(device_t, cfdata_t, void *); 56 static void imx6_usbphy_attach(device_t, device_t, void *); 57 58 static int imx6_usbphy_init_clocks(device_t); 59 static int imx6_usbphy_enable(device_t, void *, bool); 60 61 CFATTACH_DECL_NEW(imxusbphy, sizeof(struct imx6_usbphy_softc), 62 imx6_usbphy_match, imx6_usbphy_attach, NULL, NULL); 63 64 static const struct device_compatible_entry compat_data[] = { 65 { .compat = "fsl,imx6q-usbphy" }, 66 DEVICE_COMPAT_EOL 67 }; 68 69 static int 70 imx6_usbphy_match(device_t parent, cfdata_t cf, void *aux) 71 { 72 struct fdt_attach_args * const faa = aux; 73 74 return of_compatible_match(faa->faa_phandle, compat_data); 75 } 76 77 static void 78 imx6_usbphy_attach(device_t parent, device_t self, void *aux) 79 { 80 struct imx6_usbphy_softc *sc = device_private(self); 81 struct fdt_attach_args * const faa = aux; 82 const int phandle = faa->faa_phandle; 83 bus_space_tag_t bst = faa->faa_bst; 84 bus_space_handle_t bsh; 85 bus_addr_t addr; 86 bus_size_t size; 87 int error; 88 89 if (fdtbus_get_reg(phandle, 0, &addr, &size) != 0) { 90 aprint_error(": couldn't get iomux registers\n"); 91 return; 92 } 93 94 error = bus_space_map(bst, addr, size, 0, &bsh); 95 if (error) { 96 aprint_error(": couldn't map %#" PRIxBUSADDR ": %d", addr, error); 97 return; 98 } 99 100 sc->sc_clk = fdtbus_clock_get_index(phandle, 0); 101 if (sc->sc_clk == NULL) { 102 aprint_error(": couldn't get clock\n"); 103 return; 104 } 105 106 sc->sc_dev = self; 107 sc->sc_iot = bst; 108 sc->sc_ioh = bsh; 109 110 aprint_naive("\n"); 111 aprint_normal(": USB PHY\n"); 112 113 imx6_usbphy_init_clocks(self); 114 imx6_usbphy_enable(self, NULL, true); 115 } 116 117 static int 118 imx6_usbphy_init_clocks(device_t dev) 119 { 120 struct imx6_usbphy_softc * const sc = device_private(dev); 121 int error; 122 123 error = clk_enable(sc->sc_clk); 124 if (error) { 125 aprint_error_dev(sc->sc_dev, "couldn't enable: %d\n", error); 126 return error; 127 } 128 129 return 0; 130 } 131 132 #define USBPHY_READ(sc, reg) \ 133 bus_space_read_4((sc)->sc_iot, (sc)->sc_ioh, (reg)) 134 #define USBPHY_WRITE(sc, reg, val) \ 135 bus_space_write_4((sc)->sc_iot, (sc)->sc_ioh, (reg), (val)) 136 137 static int 138 imx6_usbphy_enable(device_t dev, void *priv, bool enable) 139 { 140 struct imx6_usbphy_softc * const sc = device_private(dev); 141 142 /* USBPHY enable */ 143 USBPHY_WRITE(sc, USBPHY_CTRL, USBPHY_CTRL_CLKGATE); 144 145 /* do reset */ 146 USBPHY_WRITE(sc, USBPHY_CTRL_SET, USBPHY_CTRL_SFTRST); 147 delay(100); 148 149 /* clear reset, and run clocks */ 150 USBPHY_WRITE(sc, USBPHY_CTRL_CLR, 151 USBPHY_CTRL_SFTRST | USBPHY_CTRL_CLKGATE); 152 delay(100); 153 154 /* power on */ 155 USBPHY_WRITE(sc, USBPHY_PWD, 0); 156 157 /* UTMI+Level2, Level3 */ 158 USBPHY_WRITE(sc, USBPHY_CTRL_SET, 159 USBPHY_CTRL_ENUTMILEVEL2 | USBPHY_CTRL_ENUTMILEVEL3); 160 161 return 0; 162 } 163 164