Merge tag 'drm-misc-fixes-2020-08-04' of git://anongit.freedesktop.org/drm/drm-misc...
[linux-2.6-microblaze.git] / drivers / gpu / drm / tve200 / tve200_drv.c
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Copyright (C) 2017 Linus Walleij <linus.walleij@linaro.org>
4  * Parts of this file were based on sources as follows:
5  *
6  * Copyright (C) 2006-2008 Intel Corporation
7  * Copyright (C) 2007 Amos Lee <amos_lee@storlinksemi.com>
8  * Copyright (C) 2007 Dave Airlie <airlied@linux.ie>
9  * Copyright (C) 2011 Texas Instruments
10  * Copyright (C) 2017 Eric Anholt
11  */
12
13 /**
14  * DOC: Faraday TV Encoder TVE200 DRM Driver
15  *
16  * The Faraday TV Encoder TVE200 is also known as the Gemini TV Interface
17  * Controller (TVC) and is found in the Gemini Chipset from Storlink
18  * Semiconductor (later Storm Semiconductor, later Cortina Systems)
19  * but also in the Grain Media GM8180 chipset. On the Gemini the module
20  * is connected to 8 data lines and a single clock line, comprising an
21  * 8-bit BT.656 interface.
22  *
23  * This is a very basic YUV display driver. The datasheet specifies that
24  * it supports the ITU BT.656 standard. It requires a 27 MHz clock which is
25  * the hallmark of any TV encoder supporting both PAL and NTSC.
26  *
27  * This driver exposes a standard KMS interface for this TV encoder.
28  */
29
30 #include <linux/clk.h>
31 #include <linux/dma-buf.h>
32 #include <linux/irq.h>
33 #include <linux/io.h>
34 #include <linux/module.h>
35 #include <linux/platform_device.h>
36 #include <linux/shmem_fs.h>
37 #include <linux/slab.h>
38 #include <linux/version.h>
39
40 #include <drm/drm_atomic_helper.h>
41 #include <drm/drm_bridge.h>
42 #include <drm/drm_drv.h>
43 #include <drm/drm_fb_cma_helper.h>
44 #include <drm/drm_fb_helper.h>
45 #include <drm/drm_gem_cma_helper.h>
46 #include <drm/drm_gem_framebuffer_helper.h>
47 #include <drm/drm_of.h>
48 #include <drm/drm_panel.h>
49 #include <drm/drm_probe_helper.h>
50 #include <drm/drm_vblank.h>
51
52 #include "tve200_drm.h"
53
54 #define DRIVER_DESC      "DRM module for Faraday TVE200"
55
56 static const struct drm_mode_config_funcs mode_config_funcs = {
57         .fb_create = drm_gem_fb_create,
58         .atomic_check = drm_atomic_helper_check,
59         .atomic_commit = drm_atomic_helper_commit,
60 };
61
62 static int tve200_modeset_init(struct drm_device *dev)
63 {
64         struct drm_mode_config *mode_config;
65         struct tve200_drm_dev_private *priv = dev->dev_private;
66         struct drm_panel *panel;
67         struct drm_bridge *bridge;
68         int ret = 0;
69
70         drm_mode_config_init(dev);
71         mode_config = &dev->mode_config;
72         mode_config->funcs = &mode_config_funcs;
73         mode_config->min_width = 352;
74         mode_config->max_width = 720;
75         mode_config->min_height = 240;
76         mode_config->max_height = 576;
77
78         ret = drm_of_find_panel_or_bridge(dev->dev->of_node,
79                                           0, 0, &panel, &bridge);
80         if (ret && ret != -ENODEV)
81                 return ret;
82         if (panel) {
83                 bridge = drm_panel_bridge_add_typed(panel,
84                                                     DRM_MODE_CONNECTOR_Unknown);
85                 if (IS_ERR(bridge)) {
86                         ret = PTR_ERR(bridge);
87                         goto out_bridge;
88                 }
89         } else {
90                 /*
91                  * TODO: when we are using a different bridge than a panel
92                  * (such as a dumb VGA connector) we need to devise a different
93                  * method to get the connector out of the bridge.
94                  */
95                 dev_err(dev->dev, "the bridge is not a panel\n");
96                 goto out_bridge;
97         }
98
99         ret = tve200_display_init(dev);
100         if (ret) {
101                 dev_err(dev->dev, "failed to init display\n");
102                 goto out_bridge;
103         }
104
105         ret = drm_simple_display_pipe_attach_bridge(&priv->pipe,
106                                                     bridge);
107         if (ret) {
108                 dev_err(dev->dev, "failed to attach bridge\n");
109                 goto out_bridge;
110         }
111
112         priv->panel = panel;
113         priv->connector = drm_panel_bridge_connector(bridge);
114         priv->bridge = bridge;
115
116         dev_info(dev->dev, "attached to panel %s\n",
117                  dev_name(panel->dev));
118
119         ret = drm_vblank_init(dev, 1);
120         if (ret) {
121                 dev_err(dev->dev, "failed to init vblank\n");
122                 goto out_bridge;
123         }
124
125         drm_mode_config_reset(dev);
126         drm_kms_helper_poll_init(dev);
127
128         goto finish;
129
130 out_bridge:
131         if (panel)
132                 drm_panel_bridge_remove(bridge);
133         drm_mode_config_cleanup(dev);
134 finish:
135         return ret;
136 }
137
138 DEFINE_DRM_GEM_CMA_FOPS(drm_fops);
139
140 static struct drm_driver tve200_drm_driver = {
141         .driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_ATOMIC,
142         .ioctls = NULL,
143         .fops = &drm_fops,
144         .name = "tve200",
145         .desc = DRIVER_DESC,
146         .date = "20170703",
147         .major = 1,
148         .minor = 0,
149         .patchlevel = 0,
150         DRM_GEM_CMA_DRIVER_OPS,
151 };
152
153 static int tve200_probe(struct platform_device *pdev)
154 {
155         struct device *dev = &pdev->dev;
156         struct tve200_drm_dev_private *priv;
157         struct drm_device *drm;
158         struct resource *res;
159         int irq;
160         int ret;
161
162         priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
163         if (!priv)
164                 return -ENOMEM;
165
166         drm = drm_dev_alloc(&tve200_drm_driver, dev);
167         if (IS_ERR(drm))
168                 return PTR_ERR(drm);
169         platform_set_drvdata(pdev, drm);
170         priv->drm = drm;
171         drm->dev_private = priv;
172
173         /* Clock the silicon so we can access the registers */
174         priv->pclk = devm_clk_get(dev, "PCLK");
175         if (IS_ERR(priv->pclk)) {
176                 dev_err(dev, "unable to get PCLK\n");
177                 ret = PTR_ERR(priv->pclk);
178                 goto dev_unref;
179         }
180         ret = clk_prepare_enable(priv->pclk);
181         if (ret) {
182                 dev_err(dev, "failed to enable PCLK\n");
183                 goto dev_unref;
184         }
185
186         /* This clock is for the pixels (27MHz) */
187         priv->clk = devm_clk_get(dev, "TVE");
188         if (IS_ERR(priv->clk)) {
189                 dev_err(dev, "unable to get TVE clock\n");
190                 ret = PTR_ERR(priv->clk);
191                 goto clk_disable;
192         }
193
194         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
195         priv->regs = devm_ioremap_resource(dev, res);
196         if (IS_ERR(priv->regs)) {
197                 dev_err(dev, "%s failed mmio\n", __func__);
198                 ret = -EINVAL;
199                 goto clk_disable;
200         }
201
202         irq = platform_get_irq(pdev, 0);
203         if (!irq) {
204                 ret = -EINVAL;
205                 goto clk_disable;
206         }
207
208         /* turn off interrupts before requesting the irq */
209         writel(0, priv->regs + TVE200_INT_EN);
210
211         ret = devm_request_irq(dev, irq, tve200_irq, 0, "tve200", priv);
212         if (ret) {
213                 dev_err(dev, "failed to request irq %d\n", ret);
214                 goto clk_disable;
215         }
216
217         ret = tve200_modeset_init(drm);
218         if (ret)
219                 goto clk_disable;
220
221         ret = drm_dev_register(drm, 0);
222         if (ret < 0)
223                 goto clk_disable;
224
225         /*
226          * Passing in 16 here will make the RGB565 mode the default
227          * Passing in 32 will use XRGB8888 mode
228          */
229         drm_fbdev_generic_setup(drm, 16);
230
231         return 0;
232
233 clk_disable:
234         clk_disable_unprepare(priv->pclk);
235 dev_unref:
236         drm_dev_put(drm);
237         return ret;
238 }
239
240 static int tve200_remove(struct platform_device *pdev)
241 {
242         struct drm_device *drm = platform_get_drvdata(pdev);
243         struct tve200_drm_dev_private *priv = drm->dev_private;
244
245         drm_dev_unregister(drm);
246         if (priv->panel)
247                 drm_panel_bridge_remove(priv->bridge);
248         drm_mode_config_cleanup(drm);
249         clk_disable_unprepare(priv->pclk);
250         drm_dev_put(drm);
251
252         return 0;
253 }
254
255 static const struct of_device_id tve200_of_match[] = {
256         {
257                 .compatible = "faraday,tve200",
258         },
259         {},
260 };
261
262 static struct platform_driver tve200_driver = {
263         .driver = {
264                 .name           = "tve200",
265                 .of_match_table = of_match_ptr(tve200_of_match),
266         },
267         .probe = tve200_probe,
268         .remove = tve200_remove,
269 };
270 module_platform_driver(tve200_driver);
271
272 MODULE_DESCRIPTION(DRIVER_DESC);
273 MODULE_AUTHOR("Linus Walleij <linus.walleij@linaro.org>");
274 MODULE_LICENSE("GPL");