1 /*
2  * Copyright (C) STMicroelectronics SA 2014
3  * Authors: Benjamin Gaignard <benjamin.gaignard@st.com>
4  *          Fabien Dessenne <fabien.dessenne@st.com>
5  *          for STMicroelectronics.
6  * License terms:  GNU General Public License (GPL), version 2
7  */
8 
9 #include <linux/component.h>
10 #include <linux/module.h>
11 #include <linux/platform_device.h>
12 #include <linux/reset.h>
13 
14 #include <drm/drmP.h>
15 
16 #include "sti_compositor.h"
17 #include "sti_drm_crtc.h"
18 #include "sti_drm_drv.h"
19 #include "sti_drm_plane.h"
20 #include "sti_gdp.h"
21 #include "sti_vtg.h"
22 
23 /*
24  * stiH407 compositor properties
25  */
26 struct sti_compositor_data stih407_compositor_data = {
27 	.nb_subdev = 8,
28 	.subdev_desc = {
29 			{STI_CURSOR_SUBDEV, (int)STI_CURSOR, 0x000},
30 			{STI_GPD_SUBDEV, (int)STI_GDP_0, 0x100},
31 			{STI_GPD_SUBDEV, (int)STI_GDP_1, 0x200},
32 			{STI_GPD_SUBDEV, (int)STI_GDP_2, 0x300},
33 			{STI_GPD_SUBDEV, (int)STI_GDP_3, 0x400},
34 			{STI_VID_SUBDEV, (int)STI_VID_0, 0x700},
35 			{STI_MIXER_MAIN_SUBDEV, STI_MIXER_MAIN, 0xC00},
36 			{STI_MIXER_AUX_SUBDEV, STI_MIXER_AUX, 0xD00},
37 	},
38 };
39 
40 /*
41  * stiH416 compositor properties
42  * Note:
43  * on stih416 MIXER_AUX has a different base address from MIXER_MAIN
44  * Moreover, GDPx is different for Main and Aux Mixer. So this subdev map does
45  * not fit for stiH416 if we want to enable the MIXER_AUX.
46  */
47 struct sti_compositor_data stih416_compositor_data = {
48 	.nb_subdev = 3,
49 	.subdev_desc = {
50 			{STI_GPD_SUBDEV, (int)STI_GDP_0, 0x100},
51 			{STI_GPD_SUBDEV, (int)STI_GDP_1, 0x200},
52 			{STI_MIXER_MAIN_SUBDEV, STI_MIXER_MAIN, 0xC00}
53 	},
54 };
55 
56 static int sti_compositor_init_subdev(struct sti_compositor *compo,
57 		struct sti_compositor_subdev_descriptor *desc,
58 		unsigned int array_size)
59 {
60 	unsigned int i, mixer_id = 0, layer_id = 0;
61 
62 	for (i = 0; i < array_size; i++) {
63 		switch (desc[i].type) {
64 		case STI_MIXER_MAIN_SUBDEV:
65 		case STI_MIXER_AUX_SUBDEV:
66 			compo->mixer[mixer_id++] =
67 			    sti_mixer_create(compo->dev, desc[i].id,
68 					     compo->regs + desc[i].offset);
69 			break;
70 		case STI_GPD_SUBDEV:
71 		case STI_VID_SUBDEV:
72 		case STI_CURSOR_SUBDEV:
73 			compo->layer[layer_id++] =
74 			    sti_layer_create(compo->dev, desc[i].id,
75 					     compo->regs + desc[i].offset);
76 			break;
77 		default:
78 			DRM_ERROR("Unknow subdev compoment type\n");
79 			return 1;
80 		}
81 
82 	}
83 	compo->nb_mixers = mixer_id;
84 	compo->nb_layers = layer_id;
85 
86 	return 0;
87 }
88 
89 static int sti_compositor_bind(struct device *dev, struct device *master,
90 	void *data)
91 {
92 	struct sti_compositor *compo = dev_get_drvdata(dev);
93 	struct drm_device *drm_dev = data;
94 	unsigned int i, crtc = 0, plane = 0;
95 	struct sti_drm_private *dev_priv = drm_dev->dev_private;
96 	struct drm_plane *cursor = NULL;
97 	struct drm_plane *primary = NULL;
98 
99 	dev_priv->compo = compo;
100 
101 	for (i = 0; i < compo->nb_layers; i++) {
102 		if (compo->layer[i]) {
103 			enum sti_layer_desc desc = compo->layer[i]->desc;
104 			enum sti_layer_type type = desc & STI_LAYER_TYPE_MASK;
105 			enum drm_plane_type plane_type = DRM_PLANE_TYPE_OVERLAY;
106 
107 			if (crtc < compo->nb_mixers)
108 				plane_type = DRM_PLANE_TYPE_PRIMARY;
109 
110 			switch (type) {
111 			case STI_CUR:
112 				cursor = sti_drm_plane_init(drm_dev,
113 						compo->layer[i],
114 						1, DRM_PLANE_TYPE_CURSOR);
115 				break;
116 			case STI_GDP:
117 			case STI_VID:
118 				primary = sti_drm_plane_init(drm_dev,
119 						compo->layer[i],
120 						(1 << compo->nb_mixers) - 1,
121 						plane_type);
122 				plane++;
123 				break;
124 			case STI_BCK:
125 			case STI_VDP:
126 				break;
127 			}
128 
129 			/* The first planes are reserved for primary planes*/
130 			if (crtc < compo->nb_mixers && primary) {
131 				sti_drm_crtc_init(drm_dev, compo->mixer[crtc],
132 						primary, cursor);
133 				crtc++;
134 				cursor = NULL;
135 				primary = NULL;
136 			}
137 		}
138 	}
139 
140 	drm_vblank_init(drm_dev, crtc);
141 	/* Allow usage of vblank without having to call drm_irq_install */
142 	drm_dev->irq_enabled = 1;
143 
144 	DRM_DEBUG_DRIVER("Initialized %d DRM CRTC(s) and %d DRM plane(s)\n",
145 			 crtc, plane);
146 	DRM_DEBUG_DRIVER("DRM plane(s) for VID/VDP not created yet\n");
147 
148 	return 0;
149 }
150 
151 static void sti_compositor_unbind(struct device *dev, struct device *master,
152 	void *data)
153 {
154 	/* do nothing */
155 }
156 
157 static const struct component_ops sti_compositor_ops = {
158 	.bind	= sti_compositor_bind,
159 	.unbind	= sti_compositor_unbind,
160 };
161 
162 static const struct of_device_id compositor_of_match[] = {
163 	{
164 		.compatible = "st,stih416-compositor",
165 		.data = &stih416_compositor_data,
166 	}, {
167 		.compatible = "st,stih407-compositor",
168 		.data = &stih407_compositor_data,
169 	}, {
170 		/* end node */
171 	}
172 };
173 MODULE_DEVICE_TABLE(of, compositor_of_match);
174 
175 static int sti_compositor_probe(struct platform_device *pdev)
176 {
177 	struct device *dev = &pdev->dev;
178 	struct device_node *np = dev->of_node;
179 	struct device_node *vtg_np;
180 	struct sti_compositor *compo;
181 	struct resource *res;
182 	int err;
183 
184 	compo = devm_kzalloc(dev, sizeof(*compo), GFP_KERNEL);
185 	if (!compo) {
186 		DRM_ERROR("Failed to allocate compositor context\n");
187 		return -ENOMEM;
188 	}
189 	compo->dev = dev;
190 	compo->vtg_vblank_nb.notifier_call = sti_drm_crtc_vblank_cb;
191 
192 	/* populate data structure depending on compatibility */
193 	BUG_ON(!of_match_node(compositor_of_match, np)->data);
194 
195 	memcpy(&compo->data, of_match_node(compositor_of_match, np)->data,
196 	       sizeof(struct sti_compositor_data));
197 
198 	/* Get Memory ressources */
199 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
200 	if (res == NULL) {
201 		DRM_ERROR("Get memory resource failed\n");
202 		return -ENXIO;
203 	}
204 	compo->regs = devm_ioremap(dev, res->start, resource_size(res));
205 	if (compo->regs == NULL) {
206 		DRM_ERROR("Register mapping failed\n");
207 		return -ENXIO;
208 	}
209 
210 	/* Get clock resources */
211 	compo->clk_compo_main = devm_clk_get(dev, "compo_main");
212 	if (IS_ERR(compo->clk_compo_main)) {
213 		DRM_ERROR("Cannot get compo_main clock\n");
214 		return PTR_ERR(compo->clk_compo_main);
215 	}
216 
217 	compo->clk_compo_aux = devm_clk_get(dev, "compo_aux");
218 	if (IS_ERR(compo->clk_compo_aux)) {
219 		DRM_ERROR("Cannot get compo_aux clock\n");
220 		return PTR_ERR(compo->clk_compo_aux);
221 	}
222 
223 	compo->clk_pix_main = devm_clk_get(dev, "pix_main");
224 	if (IS_ERR(compo->clk_pix_main)) {
225 		DRM_ERROR("Cannot get pix_main clock\n");
226 		return PTR_ERR(compo->clk_pix_main);
227 	}
228 
229 	compo->clk_pix_aux = devm_clk_get(dev, "pix_aux");
230 	if (IS_ERR(compo->clk_pix_aux)) {
231 		DRM_ERROR("Cannot get pix_aux clock\n");
232 		return PTR_ERR(compo->clk_pix_aux);
233 	}
234 
235 	/* Get reset resources */
236 	compo->rst_main = devm_reset_control_get(dev, "compo-main");
237 	/* Take compo main out of reset */
238 	if (!IS_ERR(compo->rst_main))
239 		reset_control_deassert(compo->rst_main);
240 
241 	compo->rst_aux = devm_reset_control_get(dev, "compo-aux");
242 	/* Take compo aux out of reset */
243 	if (!IS_ERR(compo->rst_aux))
244 		reset_control_deassert(compo->rst_aux);
245 
246 	vtg_np = of_parse_phandle(pdev->dev.of_node, "st,vtg", 0);
247 	if (vtg_np)
248 		compo->vtg_main = of_vtg_find(vtg_np);
249 
250 	vtg_np = of_parse_phandle(pdev->dev.of_node, "st,vtg", 1);
251 	if (vtg_np)
252 		compo->vtg_aux = of_vtg_find(vtg_np);
253 
254 	/* Initialize compositor subdevices */
255 	err = sti_compositor_init_subdev(compo, compo->data.subdev_desc,
256 					 compo->data.nb_subdev);
257 	if (err)
258 		return err;
259 
260 	platform_set_drvdata(pdev, compo);
261 
262 	return component_add(&pdev->dev, &sti_compositor_ops);
263 }
264 
265 static int sti_compositor_remove(struct platform_device *pdev)
266 {
267 	component_del(&pdev->dev, &sti_compositor_ops);
268 	return 0;
269 }
270 
271 static struct platform_driver sti_compositor_driver = {
272 	.driver = {
273 		.name = "sti-compositor",
274 		.of_match_table = compositor_of_match,
275 	},
276 	.probe = sti_compositor_probe,
277 	.remove = sti_compositor_remove,
278 };
279 
280 module_platform_driver(sti_compositor_driver);
281 
282 MODULE_AUTHOR("Benjamin Gaignard <benjamin.gaignard@st.com>");
283 MODULE_DESCRIPTION("STMicroelectronics SoC DRM driver");
284 MODULE_LICENSE("GPL");
285