1 /*- 2 * Copyright (c) 2015 Oleksandr Tymoshenko <gonzo@freebsd.org> 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 AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, 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 27 #include <sys/cdefs.h> 28 __FBSDID("$FreeBSD$"); 29 30 /* 31 * HDMI core module 32 */ 33 34 #include <sys/param.h> 35 #include <sys/systm.h> 36 #include <sys/eventhandler.h> 37 #include <sys/kernel.h> 38 #include <sys/module.h> 39 #include <sys/bus.h> 40 #include <sys/rman.h> 41 42 #include <dev/ofw/ofw_bus.h> 43 #include <dev/ofw/ofw_bus_subr.h> 44 45 #include <machine/bus.h> 46 47 #include <dev/videomode/videomode.h> 48 #include <dev/videomode/edidvar.h> 49 50 #include <arm/freescale/imx/imx_ccmvar.h> 51 #include <arm/freescale/imx/imx_iomuxvar.h> 52 #include <arm/freescale/imx/imx_iomuxreg.h> 53 54 #include <dev/hdmi/dwc_hdmi.h> 55 56 #include "hdmi_if.h" 57 58 struct imx_hdmi_softc { 59 struct dwc_hdmi_softc base; 60 phandle_t i2c_xref; 61 eventhandler_tag eh_tag; 62 }; 63 64 static struct ofw_compat_data compat_data[] = { 65 {"fsl,imx6dl-hdmi", 1}, 66 {"fsl,imx6q-hdmi", 1}, 67 {NULL, 0} 68 }; 69 70 static device_t 71 imx_hdmi_get_i2c_dev(device_t dev) 72 { 73 struct imx_hdmi_softc *sc; 74 75 sc = device_get_softc(dev); 76 77 if (sc->i2c_xref == 0) 78 return (NULL); 79 80 return (OF_device_from_xref(sc->i2c_xref)); 81 } 82 83 /* 84 * Deferred HDMI init. dwc_hdmi_init() does i2c transfers for DDC/EDID. The imx 85 * i2c devices also use a config_intrhook function to finish their init, because 86 * they require interrupts to perform transfers. There is no way to control 87 * whether the i2c or our hdmi intrhook function runs first. If we go first we 88 * have to continue waiting until after the i2c driver is ready to do transfers 89 * and has registered its phandle. 90 * 91 * This function is used as both a config_intrhook function and after that as an 92 * eventhandler callback function (if necessary), to see if our i2c device is 93 * ready yet. When it is, continue with hdmi init. When first called as an 94 * intrhook function the i2c devices might be ready, in which case we never 95 * register as an eventhandler at all. Otherwise we register to see newbus 96 * attach events, and as each device attaches we check to see whether it was the 97 * i2c device we care about. Once we have our i2c device we unregister from 98 * seeing further attach events. 99 */ 100 static void 101 imx_hdmi_init(void *dev) 102 { 103 struct imx_hdmi_softc *sc; 104 105 sc = device_get_softc((device_t)dev); 106 107 if (OF_device_from_xref(sc->i2c_xref) != NULL) { 108 if (sc->eh_tag != NULL) { 109 EVENTHANDLER_DEREGISTER_NOWAIT(device_attach, 110 sc->eh_tag); 111 } 112 dwc_hdmi_init(dev); 113 return; 114 } 115 116 if (bootverbose) 117 device_printf((device_t)dev, "Waiting for DDC i2c device\n"); 118 119 if (sc->eh_tag == NULL) { 120 sc->eh_tag = EVENTHANDLER_REGISTER(device_attach, 121 imx_hdmi_init, dev, EVENTHANDLER_PRI_ANY); 122 } 123 } 124 125 static int 126 imx_hdmi_detach(device_t dev) 127 { 128 struct imx_hdmi_softc *sc; 129 130 sc = device_get_softc(dev); 131 132 if (sc->base.sc_mem_res != NULL) 133 bus_release_resource(dev, SYS_RES_MEMORY, 134 sc->base.sc_mem_rid, sc->base.sc_mem_res); 135 136 return (0); 137 } 138 139 static int 140 imx_hdmi_attach(device_t dev) 141 { 142 struct imx_hdmi_softc *sc; 143 int err; 144 uint32_t gpr3; 145 phandle_t node, i2c_xref; 146 147 sc = device_get_softc(dev); 148 sc->base.sc_dev = dev; 149 sc->base.sc_get_i2c_dev = imx_hdmi_get_i2c_dev; 150 err = 0; 151 152 /* Allocate memory resources. */ 153 sc->base.sc_mem_rid = 0; 154 sc->base.sc_mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, 155 &sc->base.sc_mem_rid, RF_ACTIVE); 156 if (sc->base.sc_mem_res == NULL) { 157 device_printf(dev, "Cannot allocate memory resources\n"); 158 err = ENXIO; 159 goto out; 160 } 161 162 node = ofw_bus_get_node(dev); 163 if (OF_getencprop(node, "ddc-i2c-bus", &i2c_xref, sizeof(i2c_xref)) == -1) 164 sc->i2c_xref = 0; 165 else 166 sc->i2c_xref = i2c_xref; 167 168 imx_ccm_hdmi_enable(); 169 170 gpr3 = imx_iomux_gpr_get(IOMUXC_GPR3); 171 gpr3 &= ~(IOMUXC_GPR3_HDMI_MASK); 172 gpr3 |= IOMUXC_GPR3_HDMI_IPU1_DI0; 173 imx_iomux_gpr_set(IOMUXC_GPR3, gpr3); 174 175 /* Further HDMI init requires interrupts for i2c transfers. */ 176 config_intrhook_oneshot(imx_hdmi_init, dev); 177 return (0); 178 179 out: 180 imx_hdmi_detach(dev); 181 182 return (err); 183 } 184 185 static int 186 imx_hdmi_probe(device_t dev) 187 { 188 189 if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0) 190 return (ENXIO); 191 192 device_set_desc(dev, "Freescale i.MX6 HDMI core"); 193 194 return (BUS_PROBE_DEFAULT); 195 } 196 197 static device_method_t imx_hdmi_methods[] = { 198 /* Device interface */ 199 DEVMETHOD(device_probe, imx_hdmi_probe), 200 DEVMETHOD(device_attach, imx_hdmi_attach), 201 DEVMETHOD(device_detach, imx_hdmi_detach), 202 203 /* HDMI methods */ 204 DEVMETHOD(hdmi_get_edid, dwc_hdmi_get_edid), 205 DEVMETHOD(hdmi_set_videomode, dwc_hdmi_set_videomode), 206 207 DEVMETHOD_END 208 }; 209 210 static driver_t imx_hdmi_driver = { 211 "hdmi", 212 imx_hdmi_methods, 213 sizeof(struct imx_hdmi_softc) 214 }; 215 216 DRIVER_MODULE(hdmi, simplebus, imx_hdmi_driver, 0, 0); 217