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