rk_anxdp.c revision 1.1 
1/* $NetBSD: rk_anxdp.c,v 1.1 2019/12/19 00:25:59 jakllsch Exp $ */
2
3/*-
4 * Copyright (c) 2019 Jonathan A. Kollasch <jakllsch@kollasch.net>
5 * All rights reserved.
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(0, "$NetBSD: rk_anxdp.c,v 1.1 2019/12/19 00:25:59 jakllsch Exp $");
31
32#include <sys/param.h>
33#include <sys/bus.h>
34#include <sys/device.h>
35#include <sys/intr.h>
36#include <sys/systm.h>
37#include <sys/kernel.h>
38#include <sys/conf.h>
39
40#include <drm/drmP.h>
41#include <drm/drm_crtc_helper.h>
42
43#include <dev/fdt/fdtvar.h>
44#include <dev/fdt/fdt_port.h>
45#include <dev/fdt/syscon.h>
46
47#include <dev/ic/anx_dp.h>
48
49#define	RK3399_GRF_SOC_CON20		0x6250
50#define  EDP_LCDC_SEL			__BIT(5)
51
52enum {
53	ANXDP_PORT_INPUT = 0,
54	ANXDP_PORT_OUTPUT = 1,
55};
56
57static const char * const compatible[] = {
58	"rockchip,rk3399-edp",
59	NULL
60};
61
62struct rk_anxdp_softc {
63	struct anxdp_softc	sc_base;
64	int			sc_phandle;
65
66	struct fdt_device_ports	sc_ports;
67	struct drm_encoder	sc_encoder;
68	struct drm_display_mode	sc_curmode;
69	struct syscon		*sc_grf;
70
71	bool			sc_activated;
72};
73
74#define	to_rk_anxdp_softc(x)	container_of(x, struct rk_anxdp_softc, sc_base)
75#define	to_rk_anxdp_encoder(x)	container_of(x, struct rk_anxdp_softc, sc_encoder)
76
77static void
78rk_anxdp_select_input(struct rk_anxdp_softc *sc, u_int crtc_index)
79{
80	const uint32_t write_mask = EDP_LCDC_SEL << 16;
81	const uint32_t write_val = crtc_index == 0 ? EDP_LCDC_SEL : 0;
82
83	syscon_lock(sc->sc_grf);
84	syscon_write_4(sc->sc_grf, RK3399_GRF_SOC_CON20, write_mask | write_val);
85	syscon_unlock(sc->sc_grf);
86}
87
88static bool
89rk_anxdp_encoder_mode_fixup(struct drm_encoder *encoder,
90    const struct drm_display_mode *mode, struct drm_display_mode *adjusted_mode)
91{
92	return true;
93}
94
95static void
96rk_anxdp_encoder_mode_set(struct drm_encoder *encoder,
97    struct drm_display_mode *mode, struct drm_display_mode *adjusted)
98{
99}
100
101static void
102rk_anxdp_encoder_enable(struct drm_encoder *encoder)
103{
104}
105
106static void
107rk_anxdp_encoder_disable(struct drm_encoder *encoder)
108{
109}
110
111static void
112rk_anxdp_encoder_prepare(struct drm_encoder *encoder)
113{
114	struct rk_anxdp_softc * const sc = to_rk_anxdp_encoder(encoder);
115	const u_int crtc_index = drm_crtc_index(encoder->crtc);
116
117	rk_anxdp_select_input(sc, crtc_index);
118}
119
120static void
121rk_anxdp_encoder_commit(struct drm_encoder *encoder)
122{
123}
124
125static const struct drm_encoder_funcs rk_anxdp_encoder_funcs = {
126	.destroy = drm_encoder_cleanup,
127};
128
129static const struct drm_encoder_helper_funcs rk_anxdp_encoder_helper_funcs = {
130	.prepare = rk_anxdp_encoder_prepare,
131	.mode_fixup = rk_anxdp_encoder_mode_fixup,
132	.mode_set = rk_anxdp_encoder_mode_set,
133	.enable = rk_anxdp_encoder_enable,
134	.disable = rk_anxdp_encoder_disable,
135	.commit = rk_anxdp_encoder_commit,
136};
137
138static int
139rk_anxdp_ep_activate(device_t dev, struct fdt_endpoint *ep, bool activate)
140{
141	struct rk_anxdp_softc * const sc = device_private(dev);
142	struct fdt_endpoint *in_ep = fdt_endpoint_remote(ep);
143	struct fdt_endpoint *out_ep, *out_rep;
144	struct drm_crtc *crtc;
145	int error;
146
147	if (sc->sc_activated != false) {
148		return 0;
149	}
150
151	if (!activate)
152		return EINVAL;
153
154	if (fdt_endpoint_port_index(ep) != ANXDP_PORT_INPUT)
155		return EINVAL;
156
157	switch (fdt_endpoint_type(in_ep)) {
158	case EP_DRM_CRTC:
159		crtc = fdt_endpoint_get_data(in_ep);
160		break;
161	default:
162		return EINVAL;
163		break;
164	}
165
166	sc->sc_encoder.possible_crtcs = 0x3; /* XXX */
167	drm_encoder_init(crtc->dev, &sc->sc_encoder, &rk_anxdp_encoder_funcs,
168	    DRM_MODE_ENCODER_TMDS);
169	drm_encoder_helper_add(&sc->sc_encoder, &rk_anxdp_encoder_helper_funcs);
170
171	out_ep = fdt_endpoint_get_from_index(&sc->sc_ports, ANXDP_PORT_OUTPUT, 0);
172	if (out_ep != NULL) {
173		out_rep = fdt_endpoint_remote(out_ep);
174		if (out_rep != NULL && fdt_endpoint_type(out_rep) == EP_DRM_PANEL)
175			sc->sc_base.sc_panel = fdt_endpoint_get_data(out_rep);
176	}
177
178        sc->sc_base.sc_connector.base.connector_type = DRM_MODE_CONNECTOR_eDP;
179	error = anxdp_bind(&sc->sc_base, &sc->sc_encoder);
180	if (error != 0)
181		return error;
182	sc->sc_activated = true;
183
184	if (out_ep != NULL) {
185		/* Ignore downstream connectors, we have our own. */
186		if (out_rep != NULL && fdt_endpoint_type(out_rep) == EP_DRM_CONNECTOR)
187			return 0;
188		error = fdt_endpoint_activate(out_ep, activate);
189		if (error != 0)
190			return error;
191	}
192
193	return 0;
194}
195
196static void *
197rk_anxdp_ep_get_data(device_t dev, struct fdt_endpoint *ep)
198{
199	struct rk_anxdp_softc * const sc = device_private(dev);
200
201	return &sc->sc_encoder;
202}
203
204#if ANXDP_AUDIO
205static audio_dai_tag_t
206rk_anxdp_dai_get_tag(device_t dev, const void *data, size_t len)
207{
208	struct rk_anxdp_softc * const sc = device_private(dev);
209
210	if (len != 4)
211		return NULL;
212
213	return &sc->sc_base.sc_dai;
214}
215
216static struct fdtbus_dai_controller_func rk_anxdp_dai_funcs = {
217	.get_tag = rk_anxdp_dai_get_tag
218};
219#endif
220
221static int
222rk_anxdp_match(device_t parent, cfdata_t cf, void *aux)
223{
224	struct fdt_attach_args * const faa = aux;
225
226	return of_match_compatible(faa->faa_phandle, compatible);
227}
228
229static void
230rk_anxdp_attach(device_t parent, device_t self, void *aux)
231{
232	struct rk_anxdp_softc * const sc = device_private(self);
233	struct fdt_attach_args * const faa = aux;
234	const int phandle = faa->faa_phandle;
235	bus_addr_t addr;
236	bus_size_t size;
237
238	if (fdtbus_get_reg(phandle, 0, &addr, &size) != 0) {
239		aprint_error(": couldn't get registers\n");
240		return;
241	}
242
243	/* Required */
244	if (fdtbus_clock_enable(phandle, "pclk", true) != 0) {
245		aprint_error(": couldn't enable pclk clock\n");
246		return;
247	}
248
249	/* Required */
250	if (fdtbus_clock_enable(phandle, "dp", true) != 0) {
251		aprint_error(": couldn't enable dp clock\n");
252		return;
253	}
254
255	/* Optional */
256	if (fdtbus_clock_enable(phandle, "grf", false) != 0) {
257		aprint_error(": couldn't enable grf clock\n");
258		return;
259	}
260
261	/* TODO: Optional phy */
262
263	sc->sc_base.sc_dev = self;
264	sc->sc_base.sc_bst = faa->faa_bst;
265	if (bus_space_map(sc->sc_base.sc_bst, addr, size, 0, &sc->sc_base.sc_bsh) != 0) {
266		aprint_error(": couldn't map registers\n");
267		return;
268	}
269	sc->sc_phandle = faa->faa_phandle;
270	sc->sc_grf = fdtbus_syscon_acquire(phandle, "rockchip,grf");
271	if (sc->sc_grf == NULL) {
272		aprint_error(": couldn't get grf syscon\n");
273		return;
274	}
275
276	aprint_naive("\n");
277	aprint_normal(": eDP TX\n");
278
279	sc->sc_base.sc_flags |= ANXDP_FLAG_ROCKCHIP;
280
281	if (anxdp_attach(&sc->sc_base) != 0) {
282		aprint_error_dev(self, "failed to attach driver\n");
283		return;
284	}
285
286	sc->sc_ports.dp_ep_activate = rk_anxdp_ep_activate;
287	sc->sc_ports.dp_ep_get_data = rk_anxdp_ep_get_data;
288	fdt_ports_register(&sc->sc_ports, self, phandle, EP_DRM_ENCODER);
289
290#if ANXDP_AUDIO
291	fdtbus_register_dai_controller(self, phandle, &rk_anxdp_dai_funcs);
292#endif
293}
294
295CFATTACH_DECL_NEW(rk_anxdp, sizeof(struct rk_anxdp_softc),
296	rk_anxdp_match, rk_anxdp_attach, NULL, NULL);
297