1/*
2 * Copyright © 2006-2011 Intel Corporation
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice (including the next
12 * paragraph) shall be included in all copies or substantial portions of the
13 * Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
21 * DEALINGS IN THE SOFTWARE.
22 *
23 * Authors:
24 *	jim liu <jim.liu@intel.com>
25 *
26 * FIXME:
27 *	We should probably make this generic and share it with Medfield
28 */
29
30#include <linux/pm_runtime.h>
31
32#include <drm/drm.h>
33#include <drm/drm_crtc.h>
34#include <drm/drm_edid.h>
35#include <drm/drm_simple_kms_helper.h>
36
37#include "cdv_device.h"
38#include "psb_drv.h"
39#include "psb_intel_drv.h"
40#include "psb_intel_reg.h"
41
42/* hdmi control bits */
43#define HDMI_NULL_PACKETS_DURING_VSYNC	(1 << 9)
44#define HDMI_BORDER_ENABLE		(1 << 7)
45#define HDMI_AUDIO_ENABLE		(1 << 6)
46#define HDMI_VSYNC_ACTIVE_HIGH		(1 << 4)
47#define HDMI_HSYNC_ACTIVE_HIGH		(1 << 3)
48/* hdmi-b control bits */
49#define	HDMIB_PIPE_B_SELECT		(1 << 30)
50
51
52struct mid_intel_hdmi_priv {
53	u32 hdmi_reg;
54	u32 save_HDMIB;
55	bool has_hdmi_sink;
56	bool has_hdmi_audio;
57	/* Should set this when detect hotplug */
58	bool hdmi_device_connected;
59	struct mdfld_hdmi_i2c *i2c_bus;
60	struct i2c_adapter *hdmi_i2c_adapter;	/* for control functions */
61	struct drm_device *dev;
62};
63
64static void cdv_hdmi_mode_set(struct drm_encoder *encoder,
65			struct drm_display_mode *mode,
66			struct drm_display_mode *adjusted_mode)
67{
68	struct drm_device *dev = encoder->dev;
69	struct gma_encoder *gma_encoder = to_gma_encoder(encoder);
70	struct mid_intel_hdmi_priv *hdmi_priv = gma_encoder->dev_priv;
71	u32 hdmib;
72	struct drm_crtc *crtc = encoder->crtc;
73	struct gma_crtc *gma_crtc = to_gma_crtc(crtc);
74
75	hdmib = (2 << 10);
76
77	if (adjusted_mode->flags & DRM_MODE_FLAG_PVSYNC)
78		hdmib |= HDMI_VSYNC_ACTIVE_HIGH;
79	if (adjusted_mode->flags & DRM_MODE_FLAG_PHSYNC)
80		hdmib |= HDMI_HSYNC_ACTIVE_HIGH;
81
82	if (gma_crtc->pipe == 1)
83		hdmib |= HDMIB_PIPE_B_SELECT;
84
85	if (hdmi_priv->has_hdmi_audio) {
86		hdmib |= HDMI_AUDIO_ENABLE;
87		hdmib |= HDMI_NULL_PACKETS_DURING_VSYNC;
88	}
89
90	REG_WRITE(hdmi_priv->hdmi_reg, hdmib);
91	REG_READ(hdmi_priv->hdmi_reg);
92}
93
94static void cdv_hdmi_dpms(struct drm_encoder *encoder, int mode)
95{
96	struct drm_device *dev = encoder->dev;
97	struct gma_encoder *gma_encoder = to_gma_encoder(encoder);
98	struct mid_intel_hdmi_priv *hdmi_priv = gma_encoder->dev_priv;
99	u32 hdmib;
100
101	hdmib = REG_READ(hdmi_priv->hdmi_reg);
102
103	if (mode != DRM_MODE_DPMS_ON)
104		REG_WRITE(hdmi_priv->hdmi_reg, hdmib & ~HDMIB_PORT_EN);
105	else
106		REG_WRITE(hdmi_priv->hdmi_reg, hdmib | HDMIB_PORT_EN);
107	REG_READ(hdmi_priv->hdmi_reg);
108}
109
110static void cdv_hdmi_save(struct drm_connector *connector)
111{
112	struct drm_device *dev = connector->dev;
113	struct gma_encoder *gma_encoder = gma_attached_encoder(connector);
114	struct mid_intel_hdmi_priv *hdmi_priv = gma_encoder->dev_priv;
115
116	hdmi_priv->save_HDMIB = REG_READ(hdmi_priv->hdmi_reg);
117}
118
119static void cdv_hdmi_restore(struct drm_connector *connector)
120{
121	struct drm_device *dev = connector->dev;
122	struct gma_encoder *gma_encoder = gma_attached_encoder(connector);
123	struct mid_intel_hdmi_priv *hdmi_priv = gma_encoder->dev_priv;
124
125	REG_WRITE(hdmi_priv->hdmi_reg, hdmi_priv->save_HDMIB);
126	REG_READ(hdmi_priv->hdmi_reg);
127}
128
129static enum drm_connector_status cdv_hdmi_detect(
130				struct drm_connector *connector, bool force)
131{
132	struct gma_encoder *gma_encoder = gma_attached_encoder(connector);
133	struct mid_intel_hdmi_priv *hdmi_priv = gma_encoder->dev_priv;
134	struct edid *edid = NULL;
135	enum drm_connector_status status = connector_status_disconnected;
136
137	edid = drm_get_edid(connector, &gma_encoder->i2c_bus->adapter);
138
139	hdmi_priv->has_hdmi_sink = false;
140	hdmi_priv->has_hdmi_audio = false;
141	if (edid) {
142		if (edid->input & DRM_EDID_INPUT_DIGITAL) {
143			status = connector_status_connected;
144			hdmi_priv->has_hdmi_sink =
145						drm_detect_hdmi_monitor(edid);
146			hdmi_priv->has_hdmi_audio =
147						drm_detect_monitor_audio(edid);
148		}
149		kfree(edid);
150	}
151	return status;
152}
153
154static int cdv_hdmi_set_property(struct drm_connector *connector,
155				       struct drm_property *property,
156				       uint64_t value)
157{
158	struct drm_encoder *encoder = connector->encoder;
159
160	if (!strcmp(property->name, "scaling mode") && encoder) {
161		struct gma_crtc *crtc = to_gma_crtc(encoder->crtc);
162		bool centre;
163		uint64_t curValue;
164
165		if (!crtc)
166			return -1;
167
168		switch (value) {
169		case DRM_MODE_SCALE_FULLSCREEN:
170			break;
171		case DRM_MODE_SCALE_NO_SCALE:
172			break;
173		case DRM_MODE_SCALE_ASPECT:
174			break;
175		default:
176			return -1;
177		}
178
179		if (drm_object_property_get_value(&connector->base,
180							property, &curValue))
181			return -1;
182
183		if (curValue == value)
184			return 0;
185
186		if (drm_object_property_set_value(&connector->base,
187							property, value))
188			return -1;
189
190		centre = (curValue == DRM_MODE_SCALE_NO_SCALE) ||
191			(value == DRM_MODE_SCALE_NO_SCALE);
192
193		if (crtc->saved_mode.hdisplay != 0 &&
194		    crtc->saved_mode.vdisplay != 0) {
195			if (centre) {
196				if (!drm_crtc_helper_set_mode(encoder->crtc, &crtc->saved_mode,
197					    encoder->crtc->x, encoder->crtc->y, encoder->crtc->primary->fb))
198					return -1;
199			} else {
200				const struct drm_encoder_helper_funcs *helpers
201						    = encoder->helper_private;
202				helpers->mode_set(encoder, &crtc->saved_mode,
203					     &crtc->saved_adjusted_mode);
204			}
205		}
206	}
207	return 0;
208}
209
210/*
211 * Return the list of HDMI DDC modes if available.
212 */
213static int cdv_hdmi_get_modes(struct drm_connector *connector)
214{
215	struct gma_encoder *gma_encoder = gma_attached_encoder(connector);
216	struct edid *edid = NULL;
217	int ret = 0;
218
219	edid = drm_get_edid(connector, &gma_encoder->i2c_bus->adapter);
220	if (edid) {
221		drm_connector_update_edid_property(connector, edid);
222		ret = drm_add_edid_modes(connector, edid);
223		kfree(edid);
224	}
225	return ret;
226}
227
228static enum drm_mode_status cdv_hdmi_mode_valid(struct drm_connector *connector,
229				 struct drm_display_mode *mode)
230{
231	if (mode->clock > 165000)
232		return MODE_CLOCK_HIGH;
233	if (mode->clock < 20000)
234		return MODE_CLOCK_HIGH;
235
236	/* just in case */
237	if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
238		return MODE_NO_DBLESCAN;
239
240	/* just in case */
241	if (mode->flags & DRM_MODE_FLAG_INTERLACE)
242		return MODE_NO_INTERLACE;
243
244	return MODE_OK;
245}
246
247static void cdv_hdmi_destroy(struct drm_connector *connector)
248{
249	struct gma_encoder *gma_encoder = gma_attached_encoder(connector);
250
251	psb_intel_i2c_destroy(gma_encoder->i2c_bus);
252	drm_connector_unregister(connector);
253	drm_connector_cleanup(connector);
254	kfree(connector);
255}
256
257static const struct drm_encoder_helper_funcs cdv_hdmi_helper_funcs = {
258	.dpms = cdv_hdmi_dpms,
259	.prepare = gma_encoder_prepare,
260	.mode_set = cdv_hdmi_mode_set,
261	.commit = gma_encoder_commit,
262};
263
264static const struct drm_connector_helper_funcs
265					cdv_hdmi_connector_helper_funcs = {
266	.get_modes = cdv_hdmi_get_modes,
267	.mode_valid = cdv_hdmi_mode_valid,
268	.best_encoder = gma_best_encoder,
269};
270
271static const struct drm_connector_funcs cdv_hdmi_connector_funcs = {
272	.dpms = drm_helper_connector_dpms,
273	.detect = cdv_hdmi_detect,
274	.fill_modes = drm_helper_probe_single_connector_modes,
275	.set_property = cdv_hdmi_set_property,
276	.destroy = cdv_hdmi_destroy,
277};
278
279void cdv_hdmi_init(struct drm_device *dev,
280			struct psb_intel_mode_device *mode_dev, int reg)
281{
282	struct gma_encoder *gma_encoder;
283	struct gma_connector *gma_connector;
284	struct drm_connector *connector;
285	struct drm_encoder *encoder;
286	struct mid_intel_hdmi_priv *hdmi_priv;
287	int ddc_bus;
288
289	gma_encoder = kzalloc(sizeof(struct gma_encoder), GFP_KERNEL);
290
291	if (!gma_encoder)
292		return;
293
294	gma_connector = kzalloc(sizeof(struct gma_connector),
295				      GFP_KERNEL);
296
297	if (!gma_connector)
298		goto err_connector;
299
300	hdmi_priv = kzalloc(sizeof(struct mid_intel_hdmi_priv), GFP_KERNEL);
301
302	if (!hdmi_priv)
303		goto err_priv;
304
305	connector = &gma_connector->base;
306	connector->polled = DRM_CONNECTOR_POLL_HPD;
307	gma_connector->save = cdv_hdmi_save;
308	gma_connector->restore = cdv_hdmi_restore;
309
310	encoder = &gma_encoder->base;
311	drm_connector_init(dev, connector,
312			   &cdv_hdmi_connector_funcs,
313			   DRM_MODE_CONNECTOR_DVID);
314
315	drm_simple_encoder_init(dev, encoder, DRM_MODE_ENCODER_TMDS);
316
317	gma_connector_attach_encoder(gma_connector, gma_encoder);
318	gma_encoder->type = INTEL_OUTPUT_HDMI;
319	hdmi_priv->hdmi_reg = reg;
320	hdmi_priv->has_hdmi_sink = false;
321	gma_encoder->dev_priv = hdmi_priv;
322
323	drm_encoder_helper_add(encoder, &cdv_hdmi_helper_funcs);
324	drm_connector_helper_add(connector,
325				 &cdv_hdmi_connector_helper_funcs);
326	connector->display_info.subpixel_order = SubPixelHorizontalRGB;
327	connector->interlace_allowed = false;
328	connector->doublescan_allowed = false;
329
330	drm_object_attach_property(&connector->base,
331				      dev->mode_config.scaling_mode_property,
332				      DRM_MODE_SCALE_FULLSCREEN);
333
334	switch (reg) {
335	case SDVOB:
336		ddc_bus = GPIOE;
337		gma_encoder->ddi_select = DDI0_SELECT;
338		break;
339	case SDVOC:
340		ddc_bus = GPIOD;
341		gma_encoder->ddi_select = DDI1_SELECT;
342		break;
343	default:
344		DRM_ERROR("unknown reg 0x%x for HDMI\n", reg);
345		goto failed_ddc;
346		break;
347	}
348
349	gma_encoder->i2c_bus = psb_intel_i2c_create(dev,
350				ddc_bus, (reg == SDVOB) ? "HDMIB" : "HDMIC");
351
352	if (!gma_encoder->i2c_bus) {
353		dev_err(dev->dev, "No ddc adapter available!\n");
354		goto failed_ddc;
355	}
356
357	hdmi_priv->hdmi_i2c_adapter = &(gma_encoder->i2c_bus->adapter);
358	hdmi_priv->dev = dev;
359	drm_connector_register(connector);
360	return;
361
362failed_ddc:
363	drm_encoder_cleanup(encoder);
364	drm_connector_cleanup(connector);
365err_priv:
366	kfree(gma_connector);
367err_connector:
368	kfree(gma_encoder);
369}
370