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/i2c.h>
 28#include <drm/drmP.h>
 29
 30#include "intel_bios.h"
 31#include "psb_drv.h"
 32#include "psb_intel_drv.h"
 33#include "psb_intel_reg.h"
 34#include "power.h"
 35#include "cdv_device.h"
 36#include <linux/pm_runtime.h>
 37
 38
 39static 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
 67static int 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
 84static 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 */
134static 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
181static 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
190static 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
200static 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
207static 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
218static 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
225static 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
233static 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
240static void cdv_intel_crt_enc_destroy(struct drm_encoder *encoder)
241{
242	drm_encoder_cleanup(encoder);
243}
244
245static const struct drm_encoder_funcs cdv_intel_crt_enc_funcs = {
246	.destroy = cdv_intel_crt_enc_destroy,
247};
248
249void 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;
309failed_ddc:
310	drm_encoder_cleanup(&gma_encoder->base);
311	drm_connector_cleanup(&gma_connector->base);
312	kfree(gma_connector);
313failed_connector:
314	kfree(gma_encoder);
315	return;
316}