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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/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
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 = 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(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 = panel->connector;
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
130out_bridge:
131 if (panel)
132 drm_panel_bridge_remove(bridge);
133 drm_mode_config_cleanup(dev);
134finish:
135 return ret;
136}
137
138DEFINE_DRM_GEM_CMA_FOPS(drm_fops);
139
140static 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 .dumb_create = drm_gem_cma_dumb_create,
151 .gem_free_object_unlocked = drm_gem_cma_free_object,
152 .gem_vm_ops = &drm_gem_cma_vm_ops,
153
154 .prime_handle_to_fd = drm_gem_prime_handle_to_fd,
155 .prime_fd_to_handle = drm_gem_prime_fd_to_handle,
156 .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
157 .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
158 .gem_prime_vmap = drm_gem_cma_prime_vmap,
159 .gem_prime_vunmap = drm_gem_cma_prime_vunmap,
160 .gem_prime_mmap = drm_gem_cma_prime_mmap,
161};
162
163static int tve200_probe(struct platform_device *pdev)
164{
165 struct device *dev = &pdev->dev;
166 struct tve200_drm_dev_private *priv;
167 struct drm_device *drm;
168 struct resource *res;
169 int irq;
170 int ret;
171
172 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
173 if (!priv)
174 return -ENOMEM;
175
176 drm = drm_dev_alloc(&tve200_drm_driver, dev);
177 if (IS_ERR(drm))
178 return PTR_ERR(drm);
179 platform_set_drvdata(pdev, drm);
180 priv->drm = drm;
181 drm->dev_private = priv;
182
183 /* Clock the silicon so we can access the registers */
184 priv->pclk = devm_clk_get(dev, "PCLK");
185 if (IS_ERR(priv->pclk)) {
186 dev_err(dev, "unable to get PCLK\n");
187 ret = PTR_ERR(priv->pclk);
188 goto dev_unref;
189 }
190 ret = clk_prepare_enable(priv->pclk);
191 if (ret) {
192 dev_err(dev, "failed to enable PCLK\n");
193 goto dev_unref;
194 }
195
196 /* This clock is for the pixels (27MHz) */
197 priv->clk = devm_clk_get(dev, "TVE");
198 if (IS_ERR(priv->clk)) {
199 dev_err(dev, "unable to get TVE clock\n");
200 ret = PTR_ERR(priv->clk);
201 goto clk_disable;
202 }
203
204 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
205 priv->regs = devm_ioremap_resource(dev, res);
206 if (IS_ERR(priv->regs)) {
207 dev_err(dev, "%s failed mmio\n", __func__);
208 ret = -EINVAL;
209 goto clk_disable;
210 }
211
212 irq = platform_get_irq(pdev, 0);
213 if (!irq) {
214 ret = -EINVAL;
215 goto clk_disable;
216 }
217
218 /* turn off interrupts before requesting the irq */
219 writel(0, priv->regs + TVE200_INT_EN);
220
221 ret = devm_request_irq(dev, irq, tve200_irq, 0, "tve200", priv);
222 if (ret) {
223 dev_err(dev, "failed to request irq %d\n", ret);
224 goto clk_disable;
225 }
226
227 ret = tve200_modeset_init(drm);
228 if (ret)
229 goto clk_disable;
230
231 ret = drm_dev_register(drm, 0);
232 if (ret < 0)
233 goto clk_disable;
234
235 /*
236 * Passing in 16 here will make the RGB565 mode the default
237 * Passing in 32 will use XRGB8888 mode
238 */
239 drm_fbdev_generic_setup(drm, 16);
240
241 return 0;
242
243clk_disable:
244 clk_disable_unprepare(priv->pclk);
245dev_unref:
246 drm_dev_put(drm);
247 return ret;
248}
249
250static int tve200_remove(struct platform_device *pdev)
251{
252 struct drm_device *drm = platform_get_drvdata(pdev);
253 struct tve200_drm_dev_private *priv = drm->dev_private;
254
255 drm_dev_unregister(drm);
256 if (priv->panel)
257 drm_panel_bridge_remove(priv->bridge);
258 drm_mode_config_cleanup(drm);
259 clk_disable_unprepare(priv->pclk);
260 drm_dev_put(drm);
261
262 return 0;
263}
264
265static const struct of_device_id tve200_of_match[] = {
266 {
267 .compatible = "faraday,tve200",
268 },
269 {},
270};
271
272static struct platform_driver tve200_driver = {
273 .driver = {
274 .name = "tve200",
275 .of_match_table = of_match_ptr(tve200_of_match),
276 },
277 .probe = tve200_probe,
278 .remove = tve200_remove,
279};
280module_platform_driver(tve200_driver);
281
282MODULE_DESCRIPTION(DRIVER_DESC);
283MODULE_AUTHOR("Linus Walleij <linus.walleij@linaro.org>");
284MODULE_LICENSE("GPL");