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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_client_setup.h>
43#include <drm/drm_drv.h>
44#include <drm/drm_fbdev_dma.h>
45#include <drm/drm_fourcc.h>
46#include <drm/drm_gem_dma_helper.h>
47#include <drm/drm_gem_framebuffer_helper.h>
48#include <drm/drm_module.h>
49#include <drm/drm_of.h>
50#include <drm/drm_panel.h>
51#include <drm/drm_probe_helper.h>
52#include <drm/drm_vblank.h>
53
54#include "tve200_drm.h"
55
56#define DRIVER_DESC "DRM module for Faraday TVE200"
57
58static const struct drm_mode_config_funcs mode_config_funcs = {
59 .fb_create = drm_gem_fb_create,
60 .atomic_check = drm_atomic_helper_check,
61 .atomic_commit = drm_atomic_helper_commit,
62};
63
64static int tve200_modeset_init(struct drm_device *dev)
65{
66 struct drm_mode_config *mode_config;
67 struct tve200_drm_dev_private *priv = dev->dev_private;
68 struct drm_panel *panel;
69 struct drm_bridge *bridge;
70 int ret;
71
72 drm_mode_config_init(dev);
73 mode_config = &dev->mode_config;
74 mode_config->funcs = &mode_config_funcs;
75 mode_config->min_width = 352;
76 mode_config->max_width = 720;
77 mode_config->min_height = 240;
78 mode_config->max_height = 576;
79
80 ret = drm_of_find_panel_or_bridge(dev->dev->of_node,
81 0, 0, &panel, &bridge);
82 if (ret && ret != -ENODEV)
83 return ret;
84 if (panel) {
85 bridge = drm_panel_bridge_add_typed(panel,
86 DRM_MODE_CONNECTOR_Unknown);
87 if (IS_ERR(bridge)) {
88 ret = PTR_ERR(bridge);
89 goto out_bridge;
90 }
91 } else {
92 /*
93 * TODO: when we are using a different bridge than a panel
94 * (such as a dumb VGA connector) we need to devise a different
95 * method to get the connector out of the bridge.
96 */
97 dev_err(dev->dev, "the bridge is not a panel\n");
98 ret = -EINVAL;
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 = drm_panel_bridge_connector(bridge);
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 drm_kms_helper_poll_init(dev);
130
131 goto finish;
132
133out_bridge:
134 if (panel)
135 drm_panel_bridge_remove(bridge);
136 drm_mode_config_cleanup(dev);
137finish:
138 return ret;
139}
140
141DEFINE_DRM_GEM_DMA_FOPS(drm_fops);
142
143static const struct drm_driver tve200_drm_driver = {
144 .driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_ATOMIC,
145 .ioctls = NULL,
146 .fops = &drm_fops,
147 .name = "tve200",
148 .desc = DRIVER_DESC,
149 .date = "20170703",
150 .major = 1,
151 .minor = 0,
152 .patchlevel = 0,
153 DRM_GEM_DMA_DRIVER_OPS,
154 DRM_FBDEV_DMA_DRIVER_OPS,
155};
156
157static int tve200_probe(struct platform_device *pdev)
158{
159 struct device *dev = &pdev->dev;
160 struct tve200_drm_dev_private *priv;
161 struct drm_device *drm;
162 int irq;
163 int ret;
164
165 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
166 if (!priv)
167 return -ENOMEM;
168
169 drm = drm_dev_alloc(&tve200_drm_driver, dev);
170 if (IS_ERR(drm))
171 return PTR_ERR(drm);
172 platform_set_drvdata(pdev, drm);
173 priv->drm = drm;
174 drm->dev_private = priv;
175
176 /* Clock the silicon so we can access the registers */
177 priv->pclk = devm_clk_get(dev, "PCLK");
178 if (IS_ERR(priv->pclk)) {
179 dev_err(dev, "unable to get PCLK\n");
180 ret = PTR_ERR(priv->pclk);
181 goto dev_unref;
182 }
183 ret = clk_prepare_enable(priv->pclk);
184 if (ret) {
185 dev_err(dev, "failed to enable PCLK\n");
186 goto dev_unref;
187 }
188
189 /* This clock is for the pixels (27MHz) */
190 priv->clk = devm_clk_get(dev, "TVE");
191 if (IS_ERR(priv->clk)) {
192 dev_err(dev, "unable to get TVE clock\n");
193 ret = PTR_ERR(priv->clk);
194 goto clk_disable;
195 }
196
197 priv->regs = devm_platform_ioremap_resource(pdev, 0);
198 if (IS_ERR(priv->regs)) {
199 dev_err(dev, "%s failed mmio\n", __func__);
200 ret = -EINVAL;
201 goto clk_disable;
202 }
203
204 irq = platform_get_irq(pdev, 0);
205 if (irq < 0) {
206 ret = irq;
207 goto clk_disable;
208 }
209
210 /* turn off interrupts before requesting the irq */
211 writel(0, priv->regs + TVE200_INT_EN);
212
213 ret = devm_request_irq(dev, irq, tve200_irq, 0, "tve200", priv);
214 if (ret) {
215 dev_err(dev, "failed to request irq %d\n", ret);
216 goto clk_disable;
217 }
218
219 ret = tve200_modeset_init(drm);
220 if (ret)
221 goto clk_disable;
222
223 ret = drm_dev_register(drm, 0);
224 if (ret < 0)
225 goto clk_disable;
226
227 drm_client_setup_with_fourcc(drm, DRM_FORMAT_RGB565);
228
229 return 0;
230
231clk_disable:
232 clk_disable_unprepare(priv->pclk);
233dev_unref:
234 drm_dev_put(drm);
235 return ret;
236}
237
238static void tve200_remove(struct platform_device *pdev)
239{
240 struct drm_device *drm = platform_get_drvdata(pdev);
241 struct tve200_drm_dev_private *priv = drm->dev_private;
242
243 drm_dev_unregister(drm);
244 drm_atomic_helper_shutdown(drm);
245 if (priv->panel)
246 drm_panel_bridge_remove(priv->bridge);
247 drm_mode_config_cleanup(drm);
248 clk_disable_unprepare(priv->pclk);
249 drm_dev_put(drm);
250}
251
252static void tve200_shutdown(struct platform_device *pdev)
253{
254 drm_atomic_helper_shutdown(platform_get_drvdata(pdev));
255}
256
257static const struct of_device_id tve200_of_match[] = {
258 {
259 .compatible = "faraday,tve200",
260 },
261 {},
262};
263
264static struct platform_driver tve200_driver = {
265 .driver = {
266 .name = "tve200",
267 .of_match_table = tve200_of_match,
268 },
269 .probe = tve200_probe,
270 .remove = tve200_remove,
271 .shutdown = tve200_shutdown,
272};
273drm_module_platform_driver(tve200_driver);
274
275MODULE_DESCRIPTION(DRIVER_DESC);
276MODULE_AUTHOR("Linus Walleij <linus.walleij@linaro.org>");
277MODULE_LICENSE("GPL");
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_generic.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 struct resource *res;
160 int irq;
161 int ret;
162
163 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
164 if (!priv)
165 return -ENOMEM;
166
167 drm = drm_dev_alloc(&tve200_drm_driver, dev);
168 if (IS_ERR(drm))
169 return PTR_ERR(drm);
170 platform_set_drvdata(pdev, drm);
171 priv->drm = drm;
172 drm->dev_private = priv;
173
174 /* Clock the silicon so we can access the registers */
175 priv->pclk = devm_clk_get(dev, "PCLK");
176 if (IS_ERR(priv->pclk)) {
177 dev_err(dev, "unable to get PCLK\n");
178 ret = PTR_ERR(priv->pclk);
179 goto dev_unref;
180 }
181 ret = clk_prepare_enable(priv->pclk);
182 if (ret) {
183 dev_err(dev, "failed to enable PCLK\n");
184 goto dev_unref;
185 }
186
187 /* This clock is for the pixels (27MHz) */
188 priv->clk = devm_clk_get(dev, "TVE");
189 if (IS_ERR(priv->clk)) {
190 dev_err(dev, "unable to get TVE clock\n");
191 ret = PTR_ERR(priv->clk);
192 goto clk_disable;
193 }
194
195 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
196 priv->regs = devm_ioremap_resource(dev, res);
197 if (IS_ERR(priv->regs)) {
198 dev_err(dev, "%s failed mmio\n", __func__);
199 ret = -EINVAL;
200 goto clk_disable;
201 }
202
203 irq = platform_get_irq(pdev, 0);
204 if (irq < 0) {
205 ret = irq;
206 goto clk_disable;
207 }
208
209 /* turn off interrupts before requesting the irq */
210 writel(0, priv->regs + TVE200_INT_EN);
211
212 ret = devm_request_irq(dev, irq, tve200_irq, 0, "tve200", priv);
213 if (ret) {
214 dev_err(dev, "failed to request irq %d\n", ret);
215 goto clk_disable;
216 }
217
218 ret = tve200_modeset_init(drm);
219 if (ret)
220 goto clk_disable;
221
222 ret = drm_dev_register(drm, 0);
223 if (ret < 0)
224 goto clk_disable;
225
226 /*
227 * Passing in 16 here will make the RGB565 mode the default
228 * Passing in 32 will use XRGB8888 mode
229 */
230 drm_fbdev_generic_setup(drm, 16);
231
232 return 0;
233
234clk_disable:
235 clk_disable_unprepare(priv->pclk);
236dev_unref:
237 drm_dev_put(drm);
238 return ret;
239}
240
241static int tve200_remove(struct platform_device *pdev)
242{
243 struct drm_device *drm = platform_get_drvdata(pdev);
244 struct tve200_drm_dev_private *priv = drm->dev_private;
245
246 drm_dev_unregister(drm);
247 if (priv->panel)
248 drm_panel_bridge_remove(priv->bridge);
249 drm_mode_config_cleanup(drm);
250 clk_disable_unprepare(priv->pclk);
251 drm_dev_put(drm);
252
253 return 0;
254}
255
256static const struct of_device_id tve200_of_match[] = {
257 {
258 .compatible = "faraday,tve200",
259 },
260 {},
261};
262
263static struct platform_driver tve200_driver = {
264 .driver = {
265 .name = "tve200",
266 .of_match_table = of_match_ptr(tve200_of_match),
267 },
268 .probe = tve200_probe,
269 .remove = tve200_remove,
270};
271drm_module_platform_driver(tve200_driver);
272
273MODULE_DESCRIPTION(DRIVER_DESC);
274MODULE_AUTHOR("Linus Walleij <linus.walleij@linaro.org>");
275MODULE_LICENSE("GPL");