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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/of.h>
36#include <linux/platform_device.h>
37#include <linux/shmem_fs.h>
38#include <linux/slab.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_fbdev_dma.h>
44#include <drm/drm_gem_dma_helper.h>
45#include <drm/drm_gem_framebuffer_helper.h>
46#include <drm/drm_module.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
56static 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
62static 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;
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 ret = -EINVAL;
97 goto out_bridge;
98 }
99
100 ret = tve200_display_init(dev);
101 if (ret) {
102 dev_err(dev->dev, "failed to init display\n");
103 goto out_bridge;
104 }
105
106 ret = drm_simple_display_pipe_attach_bridge(&priv->pipe,
107 bridge);
108 if (ret) {
109 dev_err(dev->dev, "failed to attach bridge\n");
110 goto out_bridge;
111 }
112
113 priv->panel = panel;
114 priv->connector = drm_panel_bridge_connector(bridge);
115 priv->bridge = bridge;
116
117 dev_info(dev->dev, "attached to panel %s\n",
118 dev_name(panel->dev));
119
120 ret = drm_vblank_init(dev, 1);
121 if (ret) {
122 dev_err(dev->dev, "failed to init vblank\n");
123 goto out_bridge;
124 }
125
126 drm_mode_config_reset(dev);
127 drm_kms_helper_poll_init(dev);
128
129 goto finish;
130
131out_bridge:
132 if (panel)
133 drm_panel_bridge_remove(bridge);
134 drm_mode_config_cleanup(dev);
135finish:
136 return ret;
137}
138
139DEFINE_DRM_GEM_DMA_FOPS(drm_fops);
140
141static const struct drm_driver tve200_drm_driver = {
142 .driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_ATOMIC,
143 .ioctls = NULL,
144 .fops = &drm_fops,
145 .name = "tve200",
146 .desc = DRIVER_DESC,
147 .date = "20170703",
148 .major = 1,
149 .minor = 0,
150 .patchlevel = 0,
151 DRM_GEM_DMA_DRIVER_OPS,
152};
153
154static int tve200_probe(struct platform_device *pdev)
155{
156 struct device *dev = &pdev->dev;
157 struct tve200_drm_dev_private *priv;
158 struct drm_device *drm;
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 priv->regs = devm_platform_ioremap_resource(pdev, 0);
195 if (IS_ERR(priv->regs)) {
196 dev_err(dev, "%s failed mmio\n", __func__);
197 ret = -EINVAL;
198 goto clk_disable;
199 }
200
201 irq = platform_get_irq(pdev, 0);
202 if (irq < 0) {
203 ret = irq;
204 goto clk_disable;
205 }
206
207 /* turn off interrupts before requesting the irq */
208 writel(0, priv->regs + TVE200_INT_EN);
209
210 ret = devm_request_irq(dev, irq, tve200_irq, 0, "tve200", priv);
211 if (ret) {
212 dev_err(dev, "failed to request irq %d\n", ret);
213 goto clk_disable;
214 }
215
216 ret = tve200_modeset_init(drm);
217 if (ret)
218 goto clk_disable;
219
220 ret = drm_dev_register(drm, 0);
221 if (ret < 0)
222 goto clk_disable;
223
224 /*
225 * Passing in 16 here will make the RGB565 mode the default
226 * Passing in 32 will use XRGB8888 mode
227 */
228 drm_fbdev_dma_setup(drm, 16);
229
230 return 0;
231
232clk_disable:
233 clk_disable_unprepare(priv->pclk);
234dev_unref:
235 drm_dev_put(drm);
236 return ret;
237}
238
239static void tve200_remove(struct platform_device *pdev)
240{
241 struct drm_device *drm = platform_get_drvdata(pdev);
242 struct tve200_drm_dev_private *priv = drm->dev_private;
243
244 drm_dev_unregister(drm);
245 drm_atomic_helper_shutdown(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
253static void tve200_shutdown(struct platform_device *pdev)
254{
255 drm_atomic_helper_shutdown(platform_get_drvdata(pdev));
256}
257
258static const struct of_device_id tve200_of_match[] = {
259 {
260 .compatible = "faraday,tve200",
261 },
262 {},
263};
264
265static struct platform_driver tve200_driver = {
266 .driver = {
267 .name = "tve200",
268 .of_match_table = tve200_of_match,
269 },
270 .probe = tve200_probe,
271 .remove_new = tve200_remove,
272 .shutdown = tve200_shutdown,
273};
274drm_module_platform_driver(tve200_driver);
275
276MODULE_DESCRIPTION(DRIVER_DESC);
277MODULE_AUTHOR("Linus Walleij <linus.walleij@linaro.org>");
278MODULE_LICENSE("GPL");
1/*
2 * Copyright (C) 2017 Linus Walleij <linus.walleij@linaro.org>
3 * Parts of this file were based on sources as follows:
4 *
5 * Copyright (C) 2006-2008 Intel Corporation
6 * Copyright (C) 2007 Amos Lee <amos_lee@storlinksemi.com>
7 * Copyright (C) 2007 Dave Airlie <airlied@linux.ie>
8 * Copyright (C) 2011 Texas Instruments
9 * Copyright (C) 2017 Eric Anholt
10 *
11 * This program is free software and is provided to you under the terms of the
12 * GNU General Public License version 2 as published by the Free Software
13 * Foundation, and any use by you of this program is subject to the terms of
14 * such GNU licence.
15 */
16
17/**
18 * DOC: Faraday TV Encoder TVE200 DRM Driver
19 *
20 * The Faraday TV Encoder TVE200 is also known as the Gemini TV Interface
21 * Controller (TVC) and is found in the Gemini Chipset from Storlink
22 * Semiconductor (later Storm Semiconductor, later Cortina Systems)
23 * but also in the Grain Media GM8180 chipset. On the Gemini the module
24 * is connected to 8 data lines and a single clock line, comprising an
25 * 8-bit BT.656 interface.
26 *
27 * This is a very basic YUV display driver. The datasheet specifies that
28 * it supports the ITU BT.656 standard. It requires a 27 MHz clock which is
29 * the hallmark of any TV encoder supporting both PAL and NTSC.
30 *
31 * This driver exposes a standard KMS interface for this TV encoder.
32 */
33
34#include <linux/clk.h>
35#include <linux/dma-buf.h>
36#include <linux/irq.h>
37#include <linux/io.h>
38#include <linux/module.h>
39#include <linux/platform_device.h>
40#include <linux/shmem_fs.h>
41#include <linux/slab.h>
42#include <linux/version.h>
43
44#include <drm/drmP.h>
45#include <drm/drm_atomic_helper.h>
46#include <drm/drm_crtc_helper.h>
47#include <drm/drm_gem_cma_helper.h>
48#include <drm/drm_gem_framebuffer_helper.h>
49#include <drm/drm_fb_helper.h>
50#include <drm/drm_fb_cma_helper.h>
51#include <drm/drm_panel.h>
52#include <drm/drm_of.h>
53#include <drm/drm_bridge.h>
54
55#include "tve200_drm.h"
56
57#define DRIVER_DESC "DRM module for Faraday TVE200"
58
59static const struct drm_mode_config_funcs mode_config_funcs = {
60 .fb_create = drm_gem_fb_create,
61 .atomic_check = drm_atomic_helper_check,
62 .atomic_commit = drm_atomic_helper_commit,
63};
64
65static int tve200_modeset_init(struct drm_device *dev)
66{
67 struct drm_mode_config *mode_config;
68 struct tve200_drm_dev_private *priv = dev->dev_private;
69 struct drm_panel *panel;
70 struct drm_bridge *bridge;
71 int ret = 0;
72
73 drm_mode_config_init(dev);
74 mode_config = &dev->mode_config;
75 mode_config->funcs = &mode_config_funcs;
76 mode_config->min_width = 352;
77 mode_config->max_width = 720;
78 mode_config->min_height = 240;
79 mode_config->max_height = 576;
80
81 ret = drm_of_find_panel_or_bridge(dev->dev->of_node,
82 0, 0, &panel, &bridge);
83 if (ret && ret != -ENODEV)
84 return ret;
85 if (panel) {
86 bridge = drm_panel_bridge_add(panel,
87 DRM_MODE_CONNECTOR_Unknown);
88 if (IS_ERR(bridge)) {
89 ret = PTR_ERR(bridge);
90 goto out_bridge;
91 }
92 } else {
93 /*
94 * TODO: when we are using a different bridge than a panel
95 * (such as a dumb VGA connector) we need to devise a different
96 * method to get the connector out of the bridge.
97 */
98 dev_err(dev->dev, "the bridge is not a panel\n");
99 goto out_bridge;
100 }
101
102 ret = tve200_display_init(dev);
103 if (ret) {
104 dev_err(dev->dev, "failed to init display\n");
105 goto out_bridge;
106 }
107
108 ret = drm_simple_display_pipe_attach_bridge(&priv->pipe,
109 bridge);
110 if (ret) {
111 dev_err(dev->dev, "failed to attach bridge\n");
112 goto out_bridge;
113 }
114
115 priv->panel = panel;
116 priv->connector = panel->connector;
117 priv->bridge = bridge;
118
119 dev_info(dev->dev, "attached to panel %s\n",
120 dev_name(panel->dev));
121
122 ret = drm_vblank_init(dev, 1);
123 if (ret) {
124 dev_err(dev->dev, "failed to init vblank\n");
125 goto out_bridge;
126 }
127
128 drm_mode_config_reset(dev);
129
130 /*
131 * Passing in 16 here will make the RGB656 mode the default
132 * Passing in 32 will use XRGB8888 mode
133 */
134 drm_fb_cma_fbdev_init(dev, 16, 0);
135 drm_kms_helper_poll_init(dev);
136
137 goto finish;
138
139out_bridge:
140 if (panel)
141 drm_panel_bridge_remove(bridge);
142 drm_mode_config_cleanup(dev);
143finish:
144 return ret;
145}
146
147DEFINE_DRM_GEM_CMA_FOPS(drm_fops);
148
149static struct drm_driver tve200_drm_driver = {
150 .driver_features =
151 DRIVER_MODESET | DRIVER_GEM | DRIVER_PRIME | DRIVER_ATOMIC,
152 .lastclose = drm_fb_helper_lastclose,
153 .ioctls = NULL,
154 .fops = &drm_fops,
155 .name = "tve200",
156 .desc = DRIVER_DESC,
157 .date = "20170703",
158 .major = 1,
159 .minor = 0,
160 .patchlevel = 0,
161 .dumb_create = drm_gem_cma_dumb_create,
162 .gem_free_object_unlocked = drm_gem_cma_free_object,
163 .gem_vm_ops = &drm_gem_cma_vm_ops,
164
165 .prime_handle_to_fd = drm_gem_prime_handle_to_fd,
166 .prime_fd_to_handle = drm_gem_prime_fd_to_handle,
167 .gem_prime_import = drm_gem_prime_import,
168 .gem_prime_export = drm_gem_prime_export,
169 .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
170 .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
171 .gem_prime_vmap = drm_gem_cma_prime_vmap,
172 .gem_prime_vunmap = drm_gem_cma_prime_vunmap,
173 .gem_prime_mmap = drm_gem_cma_prime_mmap,
174};
175
176static int tve200_probe(struct platform_device *pdev)
177{
178 struct device *dev = &pdev->dev;
179 struct tve200_drm_dev_private *priv;
180 struct drm_device *drm;
181 struct resource *res;
182 int irq;
183 int ret;
184
185 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
186 if (!priv)
187 return -ENOMEM;
188
189 drm = drm_dev_alloc(&tve200_drm_driver, dev);
190 if (IS_ERR(drm))
191 return PTR_ERR(drm);
192 platform_set_drvdata(pdev, drm);
193 priv->drm = drm;
194 drm->dev_private = priv;
195
196 /* Clock the silicon so we can access the registers */
197 priv->pclk = devm_clk_get(dev, "PCLK");
198 if (IS_ERR(priv->pclk)) {
199 dev_err(dev, "unable to get PCLK\n");
200 ret = PTR_ERR(priv->pclk);
201 goto dev_unref;
202 }
203 ret = clk_prepare_enable(priv->pclk);
204 if (ret) {
205 dev_err(dev, "failed to enable PCLK\n");
206 goto dev_unref;
207 }
208
209 /* This clock is for the pixels (27MHz) */
210 priv->clk = devm_clk_get(dev, "TVE");
211 if (IS_ERR(priv->clk)) {
212 dev_err(dev, "unable to get TVE clock\n");
213 ret = PTR_ERR(priv->clk);
214 goto clk_disable;
215 }
216
217 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
218 priv->regs = devm_ioremap_resource(dev, res);
219 if (IS_ERR(priv->regs)) {
220 dev_err(dev, "%s failed mmio\n", __func__);
221 ret = -EINVAL;
222 goto clk_disable;
223 }
224
225 irq = platform_get_irq(pdev, 0);
226 if (!irq) {
227 ret = -EINVAL;
228 goto clk_disable;
229 }
230
231 /* turn off interrupts before requesting the irq */
232 writel(0, priv->regs + TVE200_INT_EN);
233
234 ret = devm_request_irq(dev, irq, tve200_irq, 0, "tve200", priv);
235 if (ret) {
236 dev_err(dev, "failed to request irq %d\n", ret);
237 goto clk_disable;
238 }
239
240 ret = tve200_modeset_init(drm);
241 if (ret)
242 goto clk_disable;
243
244 ret = drm_dev_register(drm, 0);
245 if (ret < 0)
246 goto clk_disable;
247
248 return 0;
249
250clk_disable:
251 clk_disable_unprepare(priv->pclk);
252dev_unref:
253 drm_dev_unref(drm);
254 return ret;
255}
256
257static int tve200_remove(struct platform_device *pdev)
258{
259 struct drm_device *drm = platform_get_drvdata(pdev);
260 struct tve200_drm_dev_private *priv = drm->dev_private;
261
262 drm_dev_unregister(drm);
263 drm_fb_cma_fbdev_fini(drm);
264 if (priv->panel)
265 drm_panel_bridge_remove(priv->bridge);
266 drm_mode_config_cleanup(drm);
267 clk_disable_unprepare(priv->pclk);
268 drm_dev_unref(drm);
269
270 return 0;
271}
272
273static const struct of_device_id tve200_of_match[] = {
274 {
275 .compatible = "faraday,tve200",
276 },
277 {},
278};
279
280static struct platform_driver tve200_driver = {
281 .driver = {
282 .name = "tve200",
283 .of_match_table = of_match_ptr(tve200_of_match),
284 },
285 .probe = tve200_probe,
286 .remove = tve200_remove,
287};
288module_platform_driver(tve200_driver);
289
290MODULE_DESCRIPTION(DRIVER_DESC);
291MODULE_AUTHOR("Linus Walleij <linus.walleij@linaro.org>");
292MODULE_LICENSE("GPL");