1 /*
2  * Copyright © 2006-2007 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  *	Eric Anholt <eric@anholt.net>
25  */
26 
27 #include <linux/delay.h>
28 #include <linux/i2c.h>
29 #include <linux/pm_runtime.h>
30 
31 #include <drm/drm_simple_kms_helper.h>
32 
33 #include "cdv_device.h"
34 #include "intel_bios.h"
35 #include "power.h"
36 #include "psb_drv.h"
37 #include "psb_intel_drv.h"
38 #include "psb_intel_reg.h"
39 
40 
41 static void cdv_intel_crt_dpms(struct drm_encoder *encoder, int mode)
42 {
43 	struct drm_device *dev = encoder->dev;
44 	u32 temp, reg;
45 	reg = ADPA;
46 
47 	temp = REG_READ(reg);
48 	temp &= ~(ADPA_HSYNC_CNTL_DISABLE | ADPA_VSYNC_CNTL_DISABLE);
49 	temp &= ~ADPA_DAC_ENABLE;
50 
51 	switch (mode) {
52 	case DRM_MODE_DPMS_ON:
53 		temp |= ADPA_DAC_ENABLE;
54 		break;
55 	case DRM_MODE_DPMS_STANDBY:
56 		temp |= ADPA_DAC_ENABLE | ADPA_HSYNC_CNTL_DISABLE;
57 		break;
58 	case DRM_MODE_DPMS_SUSPEND:
59 		temp |= ADPA_DAC_ENABLE | ADPA_VSYNC_CNTL_DISABLE;
60 		break;
61 	case DRM_MODE_DPMS_OFF:
62 		temp |= ADPA_HSYNC_CNTL_DISABLE | ADPA_VSYNC_CNTL_DISABLE;
63 		break;
64 	}
65 
66 	REG_WRITE(reg, temp);
67 }
68 
69 static enum drm_mode_status cdv_intel_crt_mode_valid(struct drm_connector *connector,
70 				struct drm_display_mode *mode)
71 {
72 	if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
73 		return MODE_NO_DBLESCAN;
74 
75 	/* The lowest clock for CDV is 20000KHz */
76 	if (mode->clock < 20000)
77 		return MODE_CLOCK_LOW;
78 
79 	/* The max clock for CDV is 355 instead of 400 */
80 	if (mode->clock > 355000)
81 		return MODE_CLOCK_HIGH;
82 
83 	return MODE_OK;
84 }
85 
86 static void cdv_intel_crt_mode_set(struct drm_encoder *encoder,
87 			       struct drm_display_mode *mode,
88 			       struct drm_display_mode *adjusted_mode)
89 {
90 
91 	struct drm_device *dev = encoder->dev;
92 	struct drm_crtc *crtc = encoder->crtc;
93 	struct gma_crtc *gma_crtc = to_gma_crtc(crtc);
94 	int dpll_md_reg;
95 	u32 adpa, dpll_md;
96 	u32 adpa_reg;
97 
98 	if (gma_crtc->pipe == 0)
99 		dpll_md_reg = DPLL_A_MD;
100 	else
101 		dpll_md_reg = DPLL_B_MD;
102 
103 	adpa_reg = ADPA;
104 
105 	/*
106 	 * Disable separate mode multiplier used when cloning SDVO to CRT
107 	 * XXX this needs to be adjusted when we really are cloning
108 	 */
109 	{
110 		dpll_md = REG_READ(dpll_md_reg);
111 		REG_WRITE(dpll_md_reg,
112 			   dpll_md & ~DPLL_MD_UDI_MULTIPLIER_MASK);
113 	}
114 
115 	adpa = 0;
116 	if (adjusted_mode->flags & DRM_MODE_FLAG_PHSYNC)
117 		adpa |= ADPA_HSYNC_ACTIVE_HIGH;
118 	if (adjusted_mode->flags & DRM_MODE_FLAG_PVSYNC)
119 		adpa |= ADPA_VSYNC_ACTIVE_HIGH;
120 
121 	if (gma_crtc->pipe == 0)
122 		adpa |= ADPA_PIPE_A_SELECT;
123 	else
124 		adpa |= ADPA_PIPE_B_SELECT;
125 
126 	REG_WRITE(adpa_reg, adpa);
127 }
128 
129 
130 /*
131  * Uses CRT_HOTPLUG_EN and CRT_HOTPLUG_STAT to detect CRT presence.
132  *
133  * \return true if CRT is connected.
134  * \return false if CRT is disconnected.
135  */
136 static bool cdv_intel_crt_detect_hotplug(struct drm_connector *connector,
137 								bool force)
138 {
139 	struct drm_device *dev = connector->dev;
140 	u32 hotplug_en;
141 	int i, tries = 0, ret = false;
142 	u32 orig;
143 
144 	/*
145 	 * On a CDV thep, CRT detect sequence need to be done twice
146 	 * to get a reliable result.
147 	 */
148 	tries = 2;
149 
150 	orig = hotplug_en = REG_READ(PORT_HOTPLUG_EN);
151 	hotplug_en &= ~(CRT_HOTPLUG_DETECT_MASK);
152 	hotplug_en |= CRT_HOTPLUG_FORCE_DETECT;
153 
154 	hotplug_en |= CRT_HOTPLUG_ACTIVATION_PERIOD_64;
155 	hotplug_en |= CRT_HOTPLUG_VOLTAGE_COMPARE_50;
156 
157 	for (i = 0; i < tries ; i++) {
158 		unsigned long timeout;
159 		/* turn on the FORCE_DETECT */
160 		REG_WRITE(PORT_HOTPLUG_EN, hotplug_en);
161 		timeout = jiffies + msecs_to_jiffies(1000);
162 		/* wait for FORCE_DETECT to go off */
163 		do {
164 			if (!(REG_READ(PORT_HOTPLUG_EN) &
165 					CRT_HOTPLUG_FORCE_DETECT))
166 				break;
167 			msleep(1);
168 		} while (time_after(timeout, jiffies));
169 	}
170 
171 	if ((REG_READ(PORT_HOTPLUG_STAT) & CRT_HOTPLUG_MONITOR_MASK) !=
172 	    CRT_HOTPLUG_MONITOR_NONE)
173 		ret = true;
174 
175 	 /* clear the interrupt we just generated, if any */
176 	REG_WRITE(PORT_HOTPLUG_STAT, CRT_HOTPLUG_INT_STATUS);
177 
178 	/* and put the bits back */
179 	REG_WRITE(PORT_HOTPLUG_EN, orig);
180 	return ret;
181 }
182 
183 static enum drm_connector_status cdv_intel_crt_detect(
184 				struct drm_connector *connector, bool force)
185 {
186 	if (cdv_intel_crt_detect_hotplug(connector, force))
187 		return connector_status_connected;
188 	else
189 		return connector_status_disconnected;
190 }
191 
192 static void cdv_intel_crt_destroy(struct drm_connector *connector)
193 {
194 	struct gma_encoder *gma_encoder = gma_attached_encoder(connector);
195 
196 	psb_intel_i2c_destroy(gma_encoder->ddc_bus);
197 	drm_connector_unregister(connector);
198 	drm_connector_cleanup(connector);
199 	kfree(connector);
200 }
201 
202 static int cdv_intel_crt_get_modes(struct drm_connector *connector)
203 {
204 	struct gma_encoder *gma_encoder = gma_attached_encoder(connector);
205 	return psb_intel_ddc_get_modes(connector,
206 				       &gma_encoder->ddc_bus->adapter);
207 }
208 
209 static int cdv_intel_crt_set_property(struct drm_connector *connector,
210 				  struct drm_property *property,
211 				  uint64_t value)
212 {
213 	return 0;
214 }
215 
216 /*
217  * Routines for controlling stuff on the analog port
218  */
219 
220 static const struct drm_encoder_helper_funcs cdv_intel_crt_helper_funcs = {
221 	.dpms = cdv_intel_crt_dpms,
222 	.prepare = gma_encoder_prepare,
223 	.commit = gma_encoder_commit,
224 	.mode_set = cdv_intel_crt_mode_set,
225 };
226 
227 static const struct drm_connector_funcs cdv_intel_crt_connector_funcs = {
228 	.dpms = drm_helper_connector_dpms,
229 	.detect = cdv_intel_crt_detect,
230 	.fill_modes = drm_helper_probe_single_connector_modes,
231 	.destroy = cdv_intel_crt_destroy,
232 	.set_property = cdv_intel_crt_set_property,
233 };
234 
235 static const struct drm_connector_helper_funcs
236 				cdv_intel_crt_connector_helper_funcs = {
237 	.mode_valid = cdv_intel_crt_mode_valid,
238 	.get_modes = cdv_intel_crt_get_modes,
239 	.best_encoder = gma_best_encoder,
240 };
241 
242 void cdv_intel_crt_init(struct drm_device *dev,
243 			struct psb_intel_mode_device *mode_dev)
244 {
245 
246 	struct gma_connector *gma_connector;
247 	struct gma_encoder *gma_encoder;
248 	struct drm_connector *connector;
249 	struct drm_encoder *encoder;
250 
251 	gma_encoder = kzalloc(sizeof(struct gma_encoder), GFP_KERNEL);
252 	if (!gma_encoder)
253 		return;
254 
255 	gma_connector = kzalloc(sizeof(struct gma_connector), GFP_KERNEL);
256 	if (!gma_connector)
257 		goto failed_connector;
258 
259 	connector = &gma_connector->base;
260 	connector->polled = DRM_CONNECTOR_POLL_HPD;
261 	drm_connector_init(dev, connector,
262 		&cdv_intel_crt_connector_funcs, DRM_MODE_CONNECTOR_VGA);
263 
264 	encoder = &gma_encoder->base;
265 	drm_simple_encoder_init(dev, encoder, DRM_MODE_ENCODER_DAC);
266 
267 	gma_connector_attach_encoder(gma_connector, gma_encoder);
268 
269 	/* Set up the DDC bus. */
270 	gma_encoder->ddc_bus = psb_intel_i2c_create(dev, GPIOA, "CRTDDC_A");
271 	if (!gma_encoder->ddc_bus) {
272 		dev_printk(KERN_ERR, dev->dev, "DDC bus registration failed.\n");
273 		goto failed_ddc;
274 	}
275 
276 	gma_encoder->type = INTEL_OUTPUT_ANALOG;
277 	connector->interlace_allowed = 0;
278 	connector->doublescan_allowed = 0;
279 
280 	drm_encoder_helper_add(encoder, &cdv_intel_crt_helper_funcs);
281 	drm_connector_helper_add(connector,
282 					&cdv_intel_crt_connector_helper_funcs);
283 
284 	drm_connector_register(connector);
285 
286 	return;
287 failed_ddc:
288 	drm_encoder_cleanup(&gma_encoder->base);
289 	drm_connector_cleanup(&gma_connector->base);
290 	kfree(gma_connector);
291 failed_connector:
292 	kfree(gma_encoder);
293 	return;
294 }
295