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 "cdv_device.h"
32 #include "intel_bios.h"
33 #include "power.h"
34 #include "psb_drv.h"
35 #include "psb_intel_drv.h"
36 #include "psb_intel_reg.h"
37 
38 
39 static void cdv_intel_crt_dpms(struct drm_encoder *encoder, int mode)
40 {
41 	struct drm_device *dev = encoder->dev;
42 	u32 temp, reg;
43 	reg = ADPA;
44 
45 	temp = REG_READ(reg);
46 	temp &= ~(ADPA_HSYNC_CNTL_DISABLE | ADPA_VSYNC_CNTL_DISABLE);
47 	temp &= ~ADPA_DAC_ENABLE;
48 
49 	switch (mode) {
50 	case DRM_MODE_DPMS_ON:
51 		temp |= ADPA_DAC_ENABLE;
52 		break;
53 	case DRM_MODE_DPMS_STANDBY:
54 		temp |= ADPA_DAC_ENABLE | ADPA_HSYNC_CNTL_DISABLE;
55 		break;
56 	case DRM_MODE_DPMS_SUSPEND:
57 		temp |= ADPA_DAC_ENABLE | ADPA_VSYNC_CNTL_DISABLE;
58 		break;
59 	case DRM_MODE_DPMS_OFF:
60 		temp |= ADPA_HSYNC_CNTL_DISABLE | ADPA_VSYNC_CNTL_DISABLE;
61 		break;
62 	}
63 
64 	REG_WRITE(reg, temp);
65 }
66 
67 static enum drm_mode_status cdv_intel_crt_mode_valid(struct drm_connector *connector,
68 				struct drm_display_mode *mode)
69 {
70 	if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
71 		return MODE_NO_DBLESCAN;
72 
73 	/* The lowest clock for CDV is 20000KHz */
74 	if (mode->clock < 20000)
75 		return MODE_CLOCK_LOW;
76 
77 	/* The max clock for CDV is 355 instead of 400 */
78 	if (mode->clock > 355000)
79 		return MODE_CLOCK_HIGH;
80 
81 	return MODE_OK;
82 }
83 
84 static void cdv_intel_crt_mode_set(struct drm_encoder *encoder,
85 			       struct drm_display_mode *mode,
86 			       struct drm_display_mode *adjusted_mode)
87 {
88 
89 	struct drm_device *dev = encoder->dev;
90 	struct drm_crtc *crtc = encoder->crtc;
91 	struct gma_crtc *gma_crtc = to_gma_crtc(crtc);
92 	int dpll_md_reg;
93 	u32 adpa, dpll_md;
94 	u32 adpa_reg;
95 
96 	if (gma_crtc->pipe == 0)
97 		dpll_md_reg = DPLL_A_MD;
98 	else
99 		dpll_md_reg = DPLL_B_MD;
100 
101 	adpa_reg = ADPA;
102 
103 	/*
104 	 * Disable separate mode multiplier used when cloning SDVO to CRT
105 	 * XXX this needs to be adjusted when we really are cloning
106 	 */
107 	{
108 		dpll_md = REG_READ(dpll_md_reg);
109 		REG_WRITE(dpll_md_reg,
110 			   dpll_md & ~DPLL_MD_UDI_MULTIPLIER_MASK);
111 	}
112 
113 	adpa = 0;
114 	if (adjusted_mode->flags & DRM_MODE_FLAG_PHSYNC)
115 		adpa |= ADPA_HSYNC_ACTIVE_HIGH;
116 	if (adjusted_mode->flags & DRM_MODE_FLAG_PVSYNC)
117 		adpa |= ADPA_VSYNC_ACTIVE_HIGH;
118 
119 	if (gma_crtc->pipe == 0)
120 		adpa |= ADPA_PIPE_A_SELECT;
121 	else
122 		adpa |= ADPA_PIPE_B_SELECT;
123 
124 	REG_WRITE(adpa_reg, adpa);
125 }
126 
127 
128 /**
129  * Uses CRT_HOTPLUG_EN and CRT_HOTPLUG_STAT to detect CRT presence.
130  *
131  * \return true if CRT is connected.
132  * \return false if CRT is disconnected.
133  */
134 static bool cdv_intel_crt_detect_hotplug(struct drm_connector *connector,
135 								bool force)
136 {
137 	struct drm_device *dev = connector->dev;
138 	u32 hotplug_en;
139 	int i, tries = 0, ret = false;
140 	u32 orig;
141 
142 	/*
143 	 * On a CDV thep, CRT detect sequence need to be done twice
144 	 * to get a reliable result.
145 	 */
146 	tries = 2;
147 
148 	orig = hotplug_en = REG_READ(PORT_HOTPLUG_EN);
149 	hotplug_en &= ~(CRT_HOTPLUG_DETECT_MASK);
150 	hotplug_en |= CRT_HOTPLUG_FORCE_DETECT;
151 
152 	hotplug_en |= CRT_HOTPLUG_ACTIVATION_PERIOD_64;
153 	hotplug_en |= CRT_HOTPLUG_VOLTAGE_COMPARE_50;
154 
155 	for (i = 0; i < tries ; i++) {
156 		unsigned long timeout;
157 		/* turn on the FORCE_DETECT */
158 		REG_WRITE(PORT_HOTPLUG_EN, hotplug_en);
159 		timeout = jiffies + msecs_to_jiffies(1000);
160 		/* wait for FORCE_DETECT to go off */
161 		do {
162 			if (!(REG_READ(PORT_HOTPLUG_EN) &
163 					CRT_HOTPLUG_FORCE_DETECT))
164 				break;
165 			msleep(1);
166 		} while (time_after(timeout, jiffies));
167 	}
168 
169 	if ((REG_READ(PORT_HOTPLUG_STAT) & CRT_HOTPLUG_MONITOR_MASK) !=
170 	    CRT_HOTPLUG_MONITOR_NONE)
171 		ret = true;
172 
173 	 /* clear the interrupt we just generated, if any */
174 	REG_WRITE(PORT_HOTPLUG_STAT, CRT_HOTPLUG_INT_STATUS);
175 
176 	/* and put the bits back */
177 	REG_WRITE(PORT_HOTPLUG_EN, orig);
178 	return ret;
179 }
180 
181 static enum drm_connector_status cdv_intel_crt_detect(
182 				struct drm_connector *connector, bool force)
183 {
184 	if (cdv_intel_crt_detect_hotplug(connector, force))
185 		return connector_status_connected;
186 	else
187 		return connector_status_disconnected;
188 }
189 
190 static void cdv_intel_crt_destroy(struct drm_connector *connector)
191 {
192 	struct gma_encoder *gma_encoder = gma_attached_encoder(connector);
193 
194 	psb_intel_i2c_destroy(gma_encoder->ddc_bus);
195 	drm_connector_unregister(connector);
196 	drm_connector_cleanup(connector);
197 	kfree(connector);
198 }
199 
200 static int cdv_intel_crt_get_modes(struct drm_connector *connector)
201 {
202 	struct gma_encoder *gma_encoder = gma_attached_encoder(connector);
203 	return psb_intel_ddc_get_modes(connector,
204 				       &gma_encoder->ddc_bus->adapter);
205 }
206 
207 static int cdv_intel_crt_set_property(struct drm_connector *connector,
208 				  struct drm_property *property,
209 				  uint64_t value)
210 {
211 	return 0;
212 }
213 
214 /*
215  * Routines for controlling stuff on the analog port
216  */
217 
218 static const struct drm_encoder_helper_funcs cdv_intel_crt_helper_funcs = {
219 	.dpms = cdv_intel_crt_dpms,
220 	.prepare = gma_encoder_prepare,
221 	.commit = gma_encoder_commit,
222 	.mode_set = cdv_intel_crt_mode_set,
223 };
224 
225 static const struct drm_connector_funcs cdv_intel_crt_connector_funcs = {
226 	.dpms = drm_helper_connector_dpms,
227 	.detect = cdv_intel_crt_detect,
228 	.fill_modes = drm_helper_probe_single_connector_modes,
229 	.destroy = cdv_intel_crt_destroy,
230 	.set_property = cdv_intel_crt_set_property,
231 };
232 
233 static const struct drm_connector_helper_funcs
234 				cdv_intel_crt_connector_helper_funcs = {
235 	.mode_valid = cdv_intel_crt_mode_valid,
236 	.get_modes = cdv_intel_crt_get_modes,
237 	.best_encoder = gma_best_encoder,
238 };
239 
240 static void cdv_intel_crt_enc_destroy(struct drm_encoder *encoder)
241 {
242 	drm_encoder_cleanup(encoder);
243 }
244 
245 static const struct drm_encoder_funcs cdv_intel_crt_enc_funcs = {
246 	.destroy = cdv_intel_crt_enc_destroy,
247 };
248 
249 void cdv_intel_crt_init(struct drm_device *dev,
250 			struct psb_intel_mode_device *mode_dev)
251 {
252 
253 	struct gma_connector *gma_connector;
254 	struct gma_encoder *gma_encoder;
255 	struct drm_connector *connector;
256 	struct drm_encoder *encoder;
257 
258 	u32 i2c_reg;
259 
260 	gma_encoder = kzalloc(sizeof(struct gma_encoder), GFP_KERNEL);
261 	if (!gma_encoder)
262 		return;
263 
264 	gma_connector = kzalloc(sizeof(struct gma_connector), GFP_KERNEL);
265 	if (!gma_connector)
266 		goto failed_connector;
267 
268 	connector = &gma_connector->base;
269 	connector->polled = DRM_CONNECTOR_POLL_HPD;
270 	drm_connector_init(dev, connector,
271 		&cdv_intel_crt_connector_funcs, DRM_MODE_CONNECTOR_VGA);
272 
273 	encoder = &gma_encoder->base;
274 	drm_encoder_init(dev, encoder,
275 		&cdv_intel_crt_enc_funcs, DRM_MODE_ENCODER_DAC, NULL);
276 
277 	gma_connector_attach_encoder(gma_connector, gma_encoder);
278 
279 	/* Set up the DDC bus. */
280 	i2c_reg = GPIOA;
281 	/* Remove the following code for CDV */
282 	/*
283 	if (dev_priv->crt_ddc_bus != 0)
284 		i2c_reg = dev_priv->crt_ddc_bus;
285 	}*/
286 	gma_encoder->ddc_bus = psb_intel_i2c_create(dev,
287 							  i2c_reg, "CRTDDC_A");
288 	if (!gma_encoder->ddc_bus) {
289 		dev_printk(KERN_ERR, &dev->pdev->dev, "DDC bus registration "
290 			   "failed.\n");
291 		goto failed_ddc;
292 	}
293 
294 	gma_encoder->type = INTEL_OUTPUT_ANALOG;
295 	/*
296 	psb_intel_output->clone_mask = (1 << INTEL_ANALOG_CLONE_BIT);
297 	psb_intel_output->crtc_mask = (1 << 0) | (1 << 1);
298 	*/
299 	connector->interlace_allowed = 0;
300 	connector->doublescan_allowed = 0;
301 
302 	drm_encoder_helper_add(encoder, &cdv_intel_crt_helper_funcs);
303 	drm_connector_helper_add(connector,
304 					&cdv_intel_crt_connector_helper_funcs);
305 
306 	drm_connector_register(connector);
307 
308 	return;
309 failed_ddc:
310 	drm_encoder_cleanup(&gma_encoder->base);
311 	drm_connector_cleanup(&gma_connector->base);
312 	kfree(gma_connector);
313 failed_connector:
314 	kfree(gma_encoder);
315 	return;
316 }
317