1/*
  2 * Copyright (c) 2014 The Linux Foundation. All rights reserved.
  3 * Copyright (C) 2013 Red Hat
  4 * Author: Rob Clark <robdclark@gmail.com>
  5 *
  6 * This program is free software; you can redistribute it and/or modify it
  7 * under the terms of the GNU General Public License version 2 as published by
  8 * the Free Software Foundation.
  9 *
 10 * This program is distributed in the hope that it will be useful, but WITHOUT
 11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 12 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 13 * more details.
 14 *
 15 * You should have received a copy of the GNU General Public License along with
 16 * this program.  If not, see <http://www.gnu.org/licenses/>.
 17 */
 18
 19#include <linux/of_irq.h>
 20#include <linux/of_gpio.h>
 21
 22#include "hdmi.h"
 23
 24void msm_hdmi_set_mode(struct hdmi *hdmi, bool power_on)
 25{
 26	uint32_t ctrl = 0;
 27	unsigned long flags;
 28
 29	spin_lock_irqsave(&hdmi->reg_lock, flags);
 30	if (power_on) {
 31		ctrl |= HDMI_CTRL_ENABLE;
 32		if (!hdmi->hdmi_mode) {
 33			ctrl |= HDMI_CTRL_HDMI;
 34			hdmi_write(hdmi, REG_HDMI_CTRL, ctrl);
 35			ctrl &= ~HDMI_CTRL_HDMI;
 36		} else {
 37			ctrl |= HDMI_CTRL_HDMI;
 38		}
 39	} else {
 40		ctrl = HDMI_CTRL_HDMI;
 41	}
 42
 43	hdmi_write(hdmi, REG_HDMI_CTRL, ctrl);
 44	spin_unlock_irqrestore(&hdmi->reg_lock, flags);
 45	DBG("HDMI Core: %s, HDMI_CTRL=0x%08x",
 46			power_on ? "Enable" : "Disable", ctrl);
 47}
 48
 49static irqreturn_t msm_hdmi_irq(int irq, void *dev_id)
 50{
 51	struct hdmi *hdmi = dev_id;
 52
 53	/* Process HPD: */
 54	msm_hdmi_connector_irq(hdmi->connector);
 55
 56	/* Process DDC: */
 57	msm_hdmi_i2c_irq(hdmi->i2c);
 58
 59	/* Process HDCP: */
 60	if (hdmi->hdcp_ctrl)
 61		msm_hdmi_hdcp_irq(hdmi->hdcp_ctrl);
 62
 63	/* TODO audio.. */
 64
 65	return IRQ_HANDLED;
 66}
 67
 68static void msm_hdmi_destroy(struct hdmi *hdmi)
 69{
 70	/*
 71	 * at this point, hpd has been disabled,
 72	 * after flush workq, it's safe to deinit hdcp
 73	 */
 74	if (hdmi->workq) {
 75		flush_workqueue(hdmi->workq);
 76		destroy_workqueue(hdmi->workq);
 77	}
 78	msm_hdmi_hdcp_destroy(hdmi);
 79
 80	if (hdmi->phy_dev) {
 81		put_device(hdmi->phy_dev);
 82		hdmi->phy = NULL;
 83		hdmi->phy_dev = NULL;
 84	}
 85
 86	if (hdmi->i2c)
 87		msm_hdmi_i2c_destroy(hdmi->i2c);
 88
 89	platform_set_drvdata(hdmi->pdev, NULL);
 90}
 91
 92static int msm_hdmi_get_phy(struct hdmi *hdmi)
 93{
 94	struct platform_device *pdev = hdmi->pdev;
 95	struct platform_device *phy_pdev;
 96	struct device_node *phy_node;
 97
 98	phy_node = of_parse_phandle(pdev->dev.of_node, "phys", 0);
 99	if (!phy_node) {
100		dev_err(&pdev->dev, "cannot find phy device\n");
101		return -ENXIO;
102	}
103
104	phy_pdev = of_find_device_by_node(phy_node);
105	if (phy_pdev)
106		hdmi->phy = platform_get_drvdata(phy_pdev);
107
108	of_node_put(phy_node);
109
110	if (!phy_pdev || !hdmi->phy) {
111		dev_err(&pdev->dev, "phy driver is not ready\n");
112		return -EPROBE_DEFER;
113	}
114
115	hdmi->phy_dev = get_device(&phy_pdev->dev);
116
117	return 0;
118}
119
120/* construct hdmi at bind/probe time, grab all the resources.  If
121 * we are to EPROBE_DEFER we want to do it here, rather than later
122 * at modeset_init() time
123 */
124static struct hdmi *msm_hdmi_init(struct platform_device *pdev)
125{
126	struct hdmi_platform_config *config = pdev->dev.platform_data;
127	struct hdmi *hdmi = NULL;
128	struct resource *res;
129	int i, ret;
130
131	hdmi = devm_kzalloc(&pdev->dev, sizeof(*hdmi), GFP_KERNEL);
132	if (!hdmi) {
133		ret = -ENOMEM;
134		goto fail;
135	}
136
137	hdmi->pdev = pdev;
138	hdmi->config = config;
139	spin_lock_init(&hdmi->reg_lock);
140
141	hdmi->mmio = msm_ioremap(pdev, config->mmio_name, "HDMI");
142	if (IS_ERR(hdmi->mmio)) {
143		ret = PTR_ERR(hdmi->mmio);
144		goto fail;
145	}
146
147	/* HDCP needs physical address of hdmi register */
148	res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
149		config->mmio_name);
150	hdmi->mmio_phy_addr = res->start;
151
152	hdmi->qfprom_mmio = msm_ioremap(pdev,
153		config->qfprom_mmio_name, "HDMI_QFPROM");
154	if (IS_ERR(hdmi->qfprom_mmio)) {
155		dev_info(&pdev->dev, "can't find qfprom resource\n");
156		hdmi->qfprom_mmio = NULL;
157	}
158
159	hdmi->hpd_regs = devm_kzalloc(&pdev->dev, sizeof(hdmi->hpd_regs[0]) *
160			config->hpd_reg_cnt, GFP_KERNEL);
161	if (!hdmi->hpd_regs) {
162		ret = -ENOMEM;
163		goto fail;
164	}
165	for (i = 0; i < config->hpd_reg_cnt; i++) {
166		struct regulator *reg;
167
168		reg = devm_regulator_get(&pdev->dev,
169				config->hpd_reg_names[i]);
170		if (IS_ERR(reg)) {
171			ret = PTR_ERR(reg);
172			dev_err(&pdev->dev, "failed to get hpd regulator: %s (%d)\n",
173					config->hpd_reg_names[i], ret);
174			goto fail;
175		}
176
177		hdmi->hpd_regs[i] = reg;
178	}
179
180	hdmi->pwr_regs = devm_kzalloc(&pdev->dev, sizeof(hdmi->pwr_regs[0]) *
181			config->pwr_reg_cnt, GFP_KERNEL);
182	if (!hdmi->pwr_regs) {
183		ret = -ENOMEM;
184		goto fail;
185	}
186	for (i = 0; i < config->pwr_reg_cnt; i++) {
187		struct regulator *reg;
188
189		reg = devm_regulator_get(&pdev->dev,
190				config->pwr_reg_names[i]);
191		if (IS_ERR(reg)) {
192			ret = PTR_ERR(reg);
193			dev_err(&pdev->dev, "failed to get pwr regulator: %s (%d)\n",
194					config->pwr_reg_names[i], ret);
195			goto fail;
196		}
197
198		hdmi->pwr_regs[i] = reg;
199	}
200
201	hdmi->hpd_clks = devm_kzalloc(&pdev->dev, sizeof(hdmi->hpd_clks[0]) *
202			config->hpd_clk_cnt, GFP_KERNEL);
203	if (!hdmi->hpd_clks) {
204		ret = -ENOMEM;
205		goto fail;
206	}
207	for (i = 0; i < config->hpd_clk_cnt; i++) {
208		struct clk *clk;
209
210		clk = devm_clk_get(&pdev->dev, config->hpd_clk_names[i]);
211		if (IS_ERR(clk)) {
212			ret = PTR_ERR(clk);
213			dev_err(&pdev->dev, "failed to get hpd clk: %s (%d)\n",
214					config->hpd_clk_names[i], ret);
215			goto fail;
216		}
217
218		hdmi->hpd_clks[i] = clk;
219	}
220
221	hdmi->pwr_clks = devm_kzalloc(&pdev->dev, sizeof(hdmi->pwr_clks[0]) *
222			config->pwr_clk_cnt, GFP_KERNEL);
223	if (!hdmi->pwr_clks) {
224		ret = -ENOMEM;
225		goto fail;
226	}
227	for (i = 0; i < config->pwr_clk_cnt; i++) {
228		struct clk *clk;
229
230		clk = devm_clk_get(&pdev->dev, config->pwr_clk_names[i]);
231		if (IS_ERR(clk)) {
232			ret = PTR_ERR(clk);
233			dev_err(&pdev->dev, "failed to get pwr clk: %s (%d)\n",
234					config->pwr_clk_names[i], ret);
235			goto fail;
236		}
237
238		hdmi->pwr_clks[i] = clk;
239	}
240
241	hdmi->workq = alloc_ordered_workqueue("msm_hdmi", 0);
242
243	hdmi->i2c = msm_hdmi_i2c_init(hdmi);
244	if (IS_ERR(hdmi->i2c)) {
245		ret = PTR_ERR(hdmi->i2c);
246		dev_err(&pdev->dev, "failed to get i2c: %d\n", ret);
247		hdmi->i2c = NULL;
248		goto fail;
249	}
250
251	ret = msm_hdmi_get_phy(hdmi);
252	if (ret) {
253		dev_err(&pdev->dev, "failed to get phy\n");
254		goto fail;
255	}
256
257	hdmi->hdcp_ctrl = msm_hdmi_hdcp_init(hdmi);
258	if (IS_ERR(hdmi->hdcp_ctrl)) {
259		dev_warn(&pdev->dev, "failed to init hdcp: disabled\n");
260		hdmi->hdcp_ctrl = NULL;
261	}
262
263	return hdmi;
264
265fail:
266	if (hdmi)
267		msm_hdmi_destroy(hdmi);
268
269	return ERR_PTR(ret);
270}
271
272/* Second part of initialization, the drm/kms level modeset_init,
273 * constructs/initializes mode objects, etc, is called from master
274 * driver (not hdmi sub-device's probe/bind!)
275 *
276 * Any resource (regulator/clk/etc) which could be missing at boot
277 * should be handled in msm_hdmi_init() so that failure happens from
278 * hdmi sub-device's probe.
279 */
280int msm_hdmi_modeset_init(struct hdmi *hdmi,
281		struct drm_device *dev, struct drm_encoder *encoder)
282{
283	struct msm_drm_private *priv = dev->dev_private;
284	struct platform_device *pdev = hdmi->pdev;
285	int ret;
286
287	hdmi->dev = dev;
288	hdmi->encoder = encoder;
289
290	hdmi_audio_infoframe_init(&hdmi->audio.infoframe);
291
292	hdmi->bridge = msm_hdmi_bridge_init(hdmi);
293	if (IS_ERR(hdmi->bridge)) {
294		ret = PTR_ERR(hdmi->bridge);
295		dev_err(dev->dev, "failed to create HDMI bridge: %d\n", ret);
296		hdmi->bridge = NULL;
297		goto fail;
298	}
299
300	hdmi->connector = msm_hdmi_connector_init(hdmi);
301	if (IS_ERR(hdmi->connector)) {
302		ret = PTR_ERR(hdmi->connector);
303		dev_err(dev->dev, "failed to create HDMI connector: %d\n", ret);
304		hdmi->connector = NULL;
305		goto fail;
306	}
307
308	hdmi->irq = irq_of_parse_and_map(pdev->dev.of_node, 0);
309	if (hdmi->irq < 0) {
310		ret = hdmi->irq;
311		dev_err(dev->dev, "failed to get irq: %d\n", ret);
312		goto fail;
313	}
314
315	ret = devm_request_irq(&pdev->dev, hdmi->irq,
316			msm_hdmi_irq, IRQF_TRIGGER_HIGH | IRQF_ONESHOT,
317			"hdmi_isr", hdmi);
318	if (ret < 0) {
319		dev_err(dev->dev, "failed to request IRQ%u: %d\n",
320				hdmi->irq, ret);
321		goto fail;
322	}
323
324	encoder->bridge = hdmi->bridge;
325
326	priv->bridges[priv->num_bridges++]       = hdmi->bridge;
327	priv->connectors[priv->num_connectors++] = hdmi->connector;
328
329	platform_set_drvdata(pdev, hdmi);
330
331	return 0;
332
333fail:
334	/* bridge is normally destroyed by drm: */
335	if (hdmi->bridge) {
336		msm_hdmi_bridge_destroy(hdmi->bridge);
337		hdmi->bridge = NULL;
338	}
339	if (hdmi->connector) {
340		hdmi->connector->funcs->destroy(hdmi->connector);
341		hdmi->connector = NULL;
342	}
343
344	return ret;
345}
346
347/*
348 * The hdmi device:
349 */
350
351#define HDMI_CFG(item, entry) \
352	.item ## _names = item ##_names_ ## entry, \
353	.item ## _cnt   = ARRAY_SIZE(item ## _names_ ## entry)
354
355static const char *pwr_reg_names_none[] = {};
356static const char *hpd_reg_names_none[] = {};
357
358static struct hdmi_platform_config hdmi_tx_8660_config;
359
360static const char *hpd_reg_names_8960[] = {"core-vdda", "hdmi-mux"};
361static const char *hpd_clk_names_8960[] = {"core_clk", "master_iface_clk", "slave_iface_clk"};
362
363static struct hdmi_platform_config hdmi_tx_8960_config = {
364		HDMI_CFG(hpd_reg, 8960),
365		HDMI_CFG(hpd_clk, 8960),
366};
367
368static const char *pwr_reg_names_8x74[] = {"core-vdda", "core-vcc"};
369static const char *hpd_reg_names_8x74[] = {"hpd-gdsc", "hpd-5v"};
370static const char *pwr_clk_names_8x74[] = {"extp_clk", "alt_iface_clk"};
371static const char *hpd_clk_names_8x74[] = {"iface_clk", "core_clk", "mdp_core_clk"};
372static unsigned long hpd_clk_freq_8x74[] = {0, 19200000, 0};
373
374static struct hdmi_platform_config hdmi_tx_8974_config = {
375		HDMI_CFG(pwr_reg, 8x74),
376		HDMI_CFG(hpd_reg, 8x74),
377		HDMI_CFG(pwr_clk, 8x74),
378		HDMI_CFG(hpd_clk, 8x74),
379		.hpd_freq      = hpd_clk_freq_8x74,
380};
381
382static const char *hpd_reg_names_8084[] = {"hpd-gdsc", "hpd-5v", "hpd-5v-en"};
383
384static struct hdmi_platform_config hdmi_tx_8084_config = {
385		HDMI_CFG(pwr_reg, 8x74),
386		HDMI_CFG(hpd_reg, 8084),
387		HDMI_CFG(pwr_clk, 8x74),
388		HDMI_CFG(hpd_clk, 8x74),
389		.hpd_freq      = hpd_clk_freq_8x74,
390};
391
392static struct hdmi_platform_config hdmi_tx_8994_config = {
393		HDMI_CFG(pwr_reg, 8x74),
394		HDMI_CFG(hpd_reg, none),
395		HDMI_CFG(pwr_clk, 8x74),
396		HDMI_CFG(hpd_clk, 8x74),
397		.hpd_freq      = hpd_clk_freq_8x74,
398};
399
400static struct hdmi_platform_config hdmi_tx_8996_config = {
401		HDMI_CFG(pwr_reg, none),
402		HDMI_CFG(hpd_reg, none),
403		HDMI_CFG(pwr_clk, 8x74),
404		HDMI_CFG(hpd_clk, 8x74),
405		.hpd_freq      = hpd_clk_freq_8x74,
406};
407
408static const struct {
409	const char *name;
410	const bool output;
411	const int value;
412	const char *label;
413} msm_hdmi_gpio_pdata[] = {
414	{ "qcom,hdmi-tx-ddc-clk", true, 1, "HDMI_DDC_CLK" },
415	{ "qcom,hdmi-tx-ddc-data", true, 1, "HDMI_DDC_DATA" },
416	{ "qcom,hdmi-tx-hpd", false, 1, "HDMI_HPD" },
417	{ "qcom,hdmi-tx-mux-en", true, 1, "HDMI_MUX_EN" },
418	{ "qcom,hdmi-tx-mux-sel", true, 0, "HDMI_MUX_SEL" },
419	{ "qcom,hdmi-tx-mux-lpm", true, 1, "HDMI_MUX_LPM" },
420};
421
422static int msm_hdmi_get_gpio(struct device_node *of_node, const char *name)
423{
424	int gpio = of_get_named_gpio(of_node, name, 0);
425	if (gpio < 0) {
426		char name2[32];
427		snprintf(name2, sizeof(name2), "%s-gpio", name);
428		gpio = of_get_named_gpio(of_node, name2, 0);
429		if (gpio < 0) {
430			DBG("failed to get gpio: %s (%d)", name, gpio);
431			gpio = -1;
432		}
433	}
434	return gpio;
435}
436
437static int msm_hdmi_bind(struct device *dev, struct device *master, void *data)
438{
439	struct drm_device *drm = dev_get_drvdata(master);
440	struct msm_drm_private *priv = drm->dev_private;
441	static struct hdmi_platform_config *hdmi_cfg;
442	struct hdmi *hdmi;
443	struct device_node *of_node = dev->of_node;
444	int i;
445
446	hdmi_cfg = (struct hdmi_platform_config *)
447			of_device_get_match_data(dev);
448	if (!hdmi_cfg) {
449		dev_err(dev, "unknown hdmi_cfg: %s\n", of_node->name);
450		return -ENXIO;
451	}
452
453	hdmi_cfg->mmio_name     = "core_physical";
454	hdmi_cfg->qfprom_mmio_name = "qfprom_physical";
455
456	for (i = 0; i < HDMI_MAX_NUM_GPIO; i++) {
457		hdmi_cfg->gpios[i].num = msm_hdmi_get_gpio(of_node,
458						msm_hdmi_gpio_pdata[i].name);
459		hdmi_cfg->gpios[i].output = msm_hdmi_gpio_pdata[i].output;
460		hdmi_cfg->gpios[i].value = msm_hdmi_gpio_pdata[i].value;
461		hdmi_cfg->gpios[i].label = msm_hdmi_gpio_pdata[i].label;
462	}
463
464	dev->platform_data = hdmi_cfg;
465
466	hdmi = msm_hdmi_init(to_platform_device(dev));
467	if (IS_ERR(hdmi))
468		return PTR_ERR(hdmi);
469	priv->hdmi = hdmi;
470
471	return 0;
472}
473
474static void msm_hdmi_unbind(struct device *dev, struct device *master,
475		void *data)
476{
477	struct drm_device *drm = dev_get_drvdata(master);
478	struct msm_drm_private *priv = drm->dev_private;
479	if (priv->hdmi) {
480		msm_hdmi_destroy(priv->hdmi);
481		priv->hdmi = NULL;
482	}
483}
484
485static const struct component_ops msm_hdmi_ops = {
486		.bind   = msm_hdmi_bind,
487		.unbind = msm_hdmi_unbind,
488};
489
490static int msm_hdmi_dev_probe(struct platform_device *pdev)
491{
492	return component_add(&pdev->dev, &msm_hdmi_ops);
493}
494
495static int msm_hdmi_dev_remove(struct platform_device *pdev)
496{
497	component_del(&pdev->dev, &msm_hdmi_ops);
498	return 0;
499}
500
501static const struct of_device_id msm_hdmi_dt_match[] = {
502	{ .compatible = "qcom,hdmi-tx-8996", .data = &hdmi_tx_8996_config },
503	{ .compatible = "qcom,hdmi-tx-8994", .data = &hdmi_tx_8994_config },
504	{ .compatible = "qcom,hdmi-tx-8084", .data = &hdmi_tx_8084_config },
505	{ .compatible = "qcom,hdmi-tx-8974", .data = &hdmi_tx_8974_config },
506	{ .compatible = "qcom,hdmi-tx-8960", .data = &hdmi_tx_8960_config },
507	{ .compatible = "qcom,hdmi-tx-8660", .data = &hdmi_tx_8660_config },
508	{}
509};
510
511static struct platform_driver msm_hdmi_driver = {
512	.probe = msm_hdmi_dev_probe,
513	.remove = msm_hdmi_dev_remove,
514	.driver = {
515		.name = "hdmi_msm",
516		.of_match_table = msm_hdmi_dt_match,
517	},
518};
519
520void __init msm_hdmi_register(void)
521{
522	msm_hdmi_phy_driver_register();
523	platform_driver_register(&msm_hdmi_driver);
524}
525
526void __exit msm_hdmi_unregister(void)
527{
528	platform_driver_unregister(&msm_hdmi_driver);
529	msm_hdmi_phy_driver_unregister();
530}