1/* Copyright (C) 2011-2013 Freescale Semiconductor, Inc.
2 *
3 * derived from imx-hdmi.c(renamed to bridge/dw_hdmi.c now)
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
8 */
9#include <linux/module.h>
10#include <linux/platform_device.h>
11#include <linux/component.h>
12#include <linux/mfd/syscon.h>
13#include <linux/mfd/syscon/imx6q-iomuxc-gpr.h>
14#include <drm/bridge/dw_hdmi.h>
15#include <video/imx-ipu-v3.h>
16#include <linux/regmap.h>
17#include <drm/drm_of.h>
18#include <drm/drmP.h>
19#include <drm/drm_crtc_helper.h>
20#include <drm/drm_edid.h>
21#include <drm/drm_encoder_slave.h>
22
23#include "imx-drm.h"
24
25struct imx_hdmi {
26	struct device *dev;
27	struct drm_encoder encoder;
28	struct regmap *regmap;
29};
30
31static const struct dw_hdmi_mpll_config imx_mpll_cfg[] = {
32	{
33		45250000, {
34			{ 0x01e0, 0x0000 },
35			{ 0x21e1, 0x0000 },
36			{ 0x41e2, 0x0000 }
37		},
38	}, {
39		92500000, {
40			{ 0x0140, 0x0005 },
41			{ 0x2141, 0x0005 },
42			{ 0x4142, 0x0005 },
43	},
44	}, {
45		148500000, {
46			{ 0x00a0, 0x000a },
47			{ 0x20a1, 0x000a },
48			{ 0x40a2, 0x000a },
49		},
50	}, {
51		216000000, {
52			{ 0x00a0, 0x000a },
53			{ 0x2001, 0x000f },
54			{ 0x4002, 0x000f },
55		},
56	}, {
57		~0UL, {
58			{ 0x0000, 0x0000 },
59			{ 0x0000, 0x0000 },
60			{ 0x0000, 0x0000 },
61		},
62	}
63};
64
65static const struct dw_hdmi_curr_ctrl imx_cur_ctr[] = {
66	/*      pixelclk     bpp8    bpp10   bpp12 */
67	{
68		54000000, { 0x091c, 0x091c, 0x06dc },
69	}, {
70		58400000, { 0x091c, 0x06dc, 0x06dc },
71	}, {
72		72000000, { 0x06dc, 0x06dc, 0x091c },
73	}, {
74		74250000, { 0x06dc, 0x0b5c, 0x091c },
75	}, {
76		118800000, { 0x091c, 0x091c, 0x06dc },
77	}, {
78		216000000, { 0x06dc, 0x0b5c, 0x091c },
79	}, {
80		~0UL, { 0x0000, 0x0000, 0x0000 },
81	},
82};
83
84/*
85 * Resistance term 133Ohm Cfg
86 * PREEMP config 0.00
87 * TX/CK level 10
88 */
89static const struct dw_hdmi_phy_config imx_phy_config[] = {
90	/*pixelclk   symbol   term   vlev */
91	{ 216000000, 0x800d, 0x0005, 0x01ad},
92	{ ~0UL,      0x0000, 0x0000, 0x0000}
93};
94
95static int dw_hdmi_imx_parse_dt(struct imx_hdmi *hdmi)
96{
97	struct device_node *np = hdmi->dev->of_node;
98
99	hdmi->regmap = syscon_regmap_lookup_by_phandle(np, "gpr");
100	if (IS_ERR(hdmi->regmap)) {
101		dev_err(hdmi->dev, "Unable to get gpr\n");
102		return PTR_ERR(hdmi->regmap);
103	}
104
105	return 0;
106}
107
108static void dw_hdmi_imx_encoder_disable(struct drm_encoder *encoder)
109{
110}
111
112static bool dw_hdmi_imx_encoder_mode_fixup(struct drm_encoder *encoder,
113					   const struct drm_display_mode *mode,
114					   struct drm_display_mode *adj_mode)
115{
116	return true;
117}
118
119static void dw_hdmi_imx_encoder_mode_set(struct drm_encoder *encoder,
120					 struct drm_display_mode *mode,
121					 struct drm_display_mode *adj_mode)
122{
123}
124
125static void dw_hdmi_imx_encoder_commit(struct drm_encoder *encoder)
126{
127	struct imx_hdmi *hdmi = container_of(encoder, struct imx_hdmi, encoder);
128	int mux = imx_drm_encoder_get_mux_id(hdmi->dev->of_node, encoder);
129
130	regmap_update_bits(hdmi->regmap, IOMUXC_GPR3,
131			   IMX6Q_GPR3_HDMI_MUX_CTL_MASK,
132			   mux << IMX6Q_GPR3_HDMI_MUX_CTL_SHIFT);
133}
134
135static void dw_hdmi_imx_encoder_prepare(struct drm_encoder *encoder)
136{
137	imx_drm_set_bus_format(encoder, MEDIA_BUS_FMT_RGB888_1X24);
138}
139
140static struct drm_encoder_helper_funcs dw_hdmi_imx_encoder_helper_funcs = {
141	.mode_fixup = dw_hdmi_imx_encoder_mode_fixup,
142	.mode_set   = dw_hdmi_imx_encoder_mode_set,
143	.prepare    = dw_hdmi_imx_encoder_prepare,
144	.commit     = dw_hdmi_imx_encoder_commit,
145	.disable    = dw_hdmi_imx_encoder_disable,
146};
147
148static struct drm_encoder_funcs dw_hdmi_imx_encoder_funcs = {
149	.destroy = drm_encoder_cleanup,
150};
151
152static enum drm_mode_status imx6q_hdmi_mode_valid(struct drm_connector *con,
153						  struct drm_display_mode *mode)
154{
155	if (mode->clock < 13500)
156		return MODE_CLOCK_LOW;
157	/* FIXME: Hardware is capable of 266MHz, but setup data is missing. */
158	if (mode->clock > 216000)
159		return MODE_CLOCK_HIGH;
160
161	return MODE_OK;
162}
163
164static enum drm_mode_status imx6dl_hdmi_mode_valid(struct drm_connector *con,
165						   struct drm_display_mode *mode)
166{
167	if (mode->clock < 13500)
168		return MODE_CLOCK_LOW;
169	/* FIXME: Hardware is capable of 270MHz, but setup data is missing. */
170	if (mode->clock > 216000)
171		return MODE_CLOCK_HIGH;
172
173	return MODE_OK;
174}
175
176static struct dw_hdmi_plat_data imx6q_hdmi_drv_data = {
177	.mpll_cfg   = imx_mpll_cfg,
178	.cur_ctr    = imx_cur_ctr,
179	.phy_config = imx_phy_config,
180	.dev_type   = IMX6Q_HDMI,
181	.mode_valid = imx6q_hdmi_mode_valid,
182};
183
184static struct dw_hdmi_plat_data imx6dl_hdmi_drv_data = {
185	.mpll_cfg = imx_mpll_cfg,
186	.cur_ctr  = imx_cur_ctr,
187	.phy_config = imx_phy_config,
188	.dev_type = IMX6DL_HDMI,
189	.mode_valid = imx6dl_hdmi_mode_valid,
190};
191
192static const struct of_device_id dw_hdmi_imx_dt_ids[] = {
193	{ .compatible = "fsl,imx6q-hdmi",
194	  .data = &imx6q_hdmi_drv_data
195	}, {
196	  .compatible = "fsl,imx6dl-hdmi",
197	  .data = &imx6dl_hdmi_drv_data
198	},
199	{},
200};
201MODULE_DEVICE_TABLE(of, dw_hdmi_imx_dt_ids);
202
203static int dw_hdmi_imx_bind(struct device *dev, struct device *master,
204			    void *data)
205{
206	struct platform_device *pdev = to_platform_device(dev);
207	const struct dw_hdmi_plat_data *plat_data;
208	const struct of_device_id *match;
209	struct drm_device *drm = data;
210	struct drm_encoder *encoder;
211	struct imx_hdmi *hdmi;
212	struct resource *iores;
213	int irq;
214	int ret;
215
216	if (!pdev->dev.of_node)
217		return -ENODEV;
218
219	hdmi = devm_kzalloc(&pdev->dev, sizeof(*hdmi), GFP_KERNEL);
220	if (!hdmi)
221		return -ENOMEM;
222
223	match = of_match_node(dw_hdmi_imx_dt_ids, pdev->dev.of_node);
224	plat_data = match->data;
225	hdmi->dev = &pdev->dev;
226	encoder = &hdmi->encoder;
227
228	irq = platform_get_irq(pdev, 0);
229	if (irq < 0)
230		return irq;
231
232	iores = platform_get_resource(pdev, IORESOURCE_MEM, 0);
233	if (!iores)
234		return -ENXIO;
235
236	platform_set_drvdata(pdev, hdmi);
237
238	encoder->possible_crtcs = drm_of_find_possible_crtcs(drm, dev->of_node);
239	/*
240	 * If we failed to find the CRTC(s) which this encoder is
241	 * supposed to be connected to, it's because the CRTC has
242	 * not been registered yet.  Defer probing, and hope that
243	 * the required CRTC is added later.
244	 */
245	if (encoder->possible_crtcs == 0)
246		return -EPROBE_DEFER;
247
248	ret = dw_hdmi_imx_parse_dt(hdmi);
249	if (ret < 0)
250		return ret;
251
252	drm_encoder_helper_add(encoder, &dw_hdmi_imx_encoder_helper_funcs);
253	drm_encoder_init(drm, encoder, &dw_hdmi_imx_encoder_funcs,
254			 DRM_MODE_ENCODER_TMDS);
255
256	return dw_hdmi_bind(dev, master, data, encoder, iores, irq, plat_data);
257}
258
259static void dw_hdmi_imx_unbind(struct device *dev, struct device *master,
260			       void *data)
261{
262	return dw_hdmi_unbind(dev, master, data);
263}
264
265static const struct component_ops dw_hdmi_imx_ops = {
266	.bind	= dw_hdmi_imx_bind,
267	.unbind	= dw_hdmi_imx_unbind,
268};
269
270static int dw_hdmi_imx_probe(struct platform_device *pdev)
271{
272	return component_add(&pdev->dev, &dw_hdmi_imx_ops);
273}
274
275static int dw_hdmi_imx_remove(struct platform_device *pdev)
276{
277	component_del(&pdev->dev, &dw_hdmi_imx_ops);
278
279	return 0;
280}
281
282static struct platform_driver dw_hdmi_imx_platform_driver = {
283	.probe  = dw_hdmi_imx_probe,
284	.remove = dw_hdmi_imx_remove,
285	.driver = {
286		.name = "dwhdmi-imx",
287		.of_match_table = dw_hdmi_imx_dt_ids,
288	},
289};
290
291module_platform_driver(dw_hdmi_imx_platform_driver);
292
293MODULE_AUTHOR("Andy Yan <andy.yan@rock-chips.com>");
294MODULE_AUTHOR("Yakir Yang <ykk@rock-chips.com>");
295MODULE_DESCRIPTION("IMX6 Specific DW-HDMI Driver Extension");
296MODULE_LICENSE("GPL");
297MODULE_ALIAS("platform:dwhdmi-imx");
298