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
imx_hdmi_get_i2c_dev(device_t dev)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
imx_hdmi_init(void * dev)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
imx_hdmi_detach(device_t dev)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
imx_hdmi_attach(device_t dev)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
imx_hdmi_probe(device_t dev)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