summaryrefslogtreecommitdiff
path: root/drivers/gpu/drm/tve200/tve200_drv.c
blob: 04db72e3fa9c2fb21135f8abf1f9f58593ad559f (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (C) 2017 Linus Walleij <linus.walleij@linaro.org>
 * Parts of this file were based on sources as follows:
 *
 * Copyright (C) 2006-2008 Intel Corporation
 * Copyright (C) 2007 Amos Lee <amos_lee@storlinksemi.com>
 * Copyright (C) 2007 Dave Airlie <airlied@linux.ie>
 * Copyright (C) 2011 Texas Instruments
 * Copyright (C) 2017 Eric Anholt
 */

/**
 * DOC: Faraday TV Encoder TVE200 DRM Driver
 *
 * The Faraday TV Encoder TVE200 is also known as the Gemini TV Interface
 * Controller (TVC) and is found in the Gemini Chipset from Storlink
 * Semiconductor (later Storm Semiconductor, later Cortina Systems)
 * but also in the Grain Media GM8180 chipset. On the Gemini the module
 * is connected to 8 data lines and a single clock line, comprising an
 * 8-bit BT.656 interface.
 *
 * This is a very basic YUV display driver. The datasheet specifies that
 * it supports the ITU BT.656 standard. It requires a 27 MHz clock which is
 * the hallmark of any TV encoder supporting both PAL and NTSC.
 *
 * This driver exposes a standard KMS interface for this TV encoder.
 */

#include <linux/clk.h>
#include <linux/dma-buf.h>
#include <linux/irq.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/shmem_fs.h>
#include <linux/slab.h>

#include <drm/drm_atomic_helper.h>
#include <drm/drm_bridge.h>
#include <drm/drm_drv.h>
#include <drm/drm_fb_helper.h>
#include <drm/drm_gem_dma_helper.h>
#include <drm/drm_gem_framebuffer_helper.h>
#include <drm/drm_module.h>
#include <drm/drm_of.h>
#include <drm/drm_panel.h>
#include <drm/drm_probe_helper.h>
#include <drm/drm_vblank.h>

#include "tve200_drm.h"

#define DRIVER_DESC      "DRM module for Faraday TVE200"

static const struct drm_mode_config_funcs mode_config_funcs = {
	.fb_create = drm_gem_fb_create,
	.atomic_check = drm_atomic_helper_check,
	.atomic_commit = drm_atomic_helper_commit,
};

static int tve200_modeset_init(struct drm_device *dev)
{
	struct drm_mode_config *mode_config;
	struct tve200_drm_dev_private *priv = dev->dev_private;
	struct drm_panel *panel;
	struct drm_bridge *bridge;
	int ret;

	drm_mode_config_init(dev);
	mode_config = &dev->mode_config;
	mode_config->funcs = &mode_config_funcs;
	mode_config->min_width = 352;
	mode_config->max_width = 720;
	mode_config->min_height = 240;
	mode_config->max_height = 576;

	ret = drm_of_find_panel_or_bridge(dev->dev->of_node,
					  0, 0, &panel, &bridge);
	if (ret && ret != -ENODEV)
		return ret;
	if (panel) {
		bridge = drm_panel_bridge_add_typed(panel,
						    DRM_MODE_CONNECTOR_Unknown);
		if (IS_ERR(bridge)) {
			ret = PTR_ERR(bridge);
			goto out_bridge;
		}
	} else {
		/*
		 * TODO: when we are using a different bridge than a panel
		 * (such as a dumb VGA connector) we need to devise a different
		 * method to get the connector out of the bridge.
		 */
		dev_err(dev->dev, "the bridge is not a panel\n");
		ret = -EINVAL;
		goto out_bridge;
	}

	ret = tve200_display_init(dev);
	if (ret) {
		dev_err(dev->dev, "failed to init display\n");
		goto out_bridge;
	}

	ret = drm_simple_display_pipe_attach_bridge(&priv->pipe,
						    bridge);
	if (ret) {
		dev_err(dev->dev, "failed to attach bridge\n");
		goto out_bridge;
	}

	priv->panel = panel;
	priv->connector = drm_panel_bridge_connector(bridge);
	priv->bridge = bridge;

	dev_info(dev->dev, "attached to panel %s\n",
		 dev_name(panel->dev));

	ret = drm_vblank_init(dev, 1);
	if (ret) {
		dev_err(dev->dev, "failed to init vblank\n");
		goto out_bridge;
	}

	drm_mode_config_reset(dev);
	drm_kms_helper_poll_init(dev);

	goto finish;

out_bridge:
	if (panel)
		drm_panel_bridge_remove(bridge);
	drm_mode_config_cleanup(dev);
finish:
	return ret;
}

DEFINE_DRM_GEM_DMA_FOPS(drm_fops);

static const struct drm_driver tve200_drm_driver = {
	.driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_ATOMIC,
	.ioctls = NULL,
	.fops = &drm_fops,
	.name = "tve200",
	.desc = DRIVER_DESC,
	.date = "20170703",
	.major = 1,
	.minor = 0,
	.patchlevel = 0,
	DRM_GEM_DMA_DRIVER_OPS,
};

static int tve200_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct tve200_drm_dev_private *priv;
	struct drm_device *drm;
	struct resource *res;
	int irq;
	int ret;

	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
	if (!priv)
		return -ENOMEM;

	drm = drm_dev_alloc(&tve200_drm_driver, dev);
	if (IS_ERR(drm))
		return PTR_ERR(drm);
	platform_set_drvdata(pdev, drm);
	priv->drm = drm;
	drm->dev_private = priv;

	/* Clock the silicon so we can access the registers */
	priv->pclk = devm_clk_get(dev, "PCLK");
	if (IS_ERR(priv->pclk)) {
		dev_err(dev, "unable to get PCLK\n");
		ret = PTR_ERR(priv->pclk);
		goto dev_unref;
	}
	ret = clk_prepare_enable(priv->pclk);
	if (ret) {
		dev_err(dev, "failed to enable PCLK\n");
		goto dev_unref;
	}

	/* This clock is for the pixels (27MHz) */
	priv->clk = devm_clk_get(dev, "TVE");
	if (IS_ERR(priv->clk)) {
		dev_err(dev, "unable to get TVE clock\n");
		ret = PTR_ERR(priv->clk);
		goto clk_disable;
	}

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	priv->regs = devm_ioremap_resource(dev, res);
	if (IS_ERR(priv->regs)) {
		dev_err(dev, "%s failed mmio\n", __func__);
		ret = -EINVAL;
		goto clk_disable;
	}

	irq = platform_get_irq(pdev, 0);
	if (irq < 0) {
		ret = irq;
		goto clk_disable;
	}

	/* turn off interrupts before requesting the irq */
	writel(0, priv->regs + TVE200_INT_EN);

	ret = devm_request_irq(dev, irq, tve200_irq, 0, "tve200", priv);
	if (ret) {
		dev_err(dev, "failed to request irq %d\n", ret);
		goto clk_disable;
	}

	ret = tve200_modeset_init(drm);
	if (ret)
		goto clk_disable;

	ret = drm_dev_register(drm, 0);
	if (ret < 0)
		goto clk_disable;

	/*
	 * Passing in 16 here will make the RGB565 mode the default
	 * Passing in 32 will use XRGB8888 mode
	 */
	drm_fbdev_generic_setup(drm, 16);

	return 0;

clk_disable:
	clk_disable_unprepare(priv->pclk);
dev_unref:
	drm_dev_put(drm);
	return ret;
}

static int tve200_remove(struct platform_device *pdev)
{
	struct drm_device *drm = platform_get_drvdata(pdev);
	struct tve200_drm_dev_private *priv = drm->dev_private;

	drm_dev_unregister(drm);
	if (priv->panel)
		drm_panel_bridge_remove(priv->bridge);
	drm_mode_config_cleanup(drm);
	clk_disable_unprepare(priv->pclk);
	drm_dev_put(drm);

	return 0;
}

static const struct of_device_id tve200_of_match[] = {
	{
		.compatible = "faraday,tve200",
	},
	{},
};

static struct platform_driver tve200_driver = {
	.driver = {
		.name           = "tve200",
		.of_match_table = of_match_ptr(tve200_of_match),
	},
	.probe = tve200_probe,
	.remove = tve200_remove,
};
drm_module_platform_driver(tve200_driver);

MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_AUTHOR("Linus Walleij <linus.walleij@linaro.org>");
MODULE_LICENSE("GPL");