2 * Copyright (C) 2017 Linus Walleij <linus.walleij@linaro.org>
3 * Parts of this file were based on sources as follows:
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
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
18 * DOC: Faraday TV Encoder TVE200 DRM Driver
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.
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.
31 * This driver exposes a standard KMS interface for this TV encoder.
34 #include <linux/clk.h>
35 #include <linux/dma-buf.h>
36 #include <linux/irq.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>
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>
55 #include "tve200_drm.h"
57 #define DRIVER_DESC "DRM module for Faraday TVE200"
59 static 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,
65 static int tve200_modeset_init(struct drm_device *dev)
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;
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;
81 ret = drm_of_find_panel_or_bridge(dev->dev->of_node,
82 0, 0, &panel, &bridge);
83 if (ret && ret != -ENODEV)
86 bridge = drm_panel_bridge_add(panel,
87 DRM_MODE_CONNECTOR_Unknown);
89 ret = PTR_ERR(bridge);
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.
98 dev_err(dev->dev, "the bridge is not a panel\n");
102 ret = tve200_display_init(dev);
104 dev_err(dev->dev, "failed to init display\n");
108 ret = drm_simple_display_pipe_attach_bridge(&priv->pipe,
111 dev_err(dev->dev, "failed to attach bridge\n");
116 priv->connector = panel->connector;
117 priv->bridge = bridge;
119 dev_info(dev->dev, "attached to panel %s\n",
120 dev_name(panel->dev));
122 ret = drm_vblank_init(dev, 1);
124 dev_err(dev->dev, "failed to init vblank\n");
128 drm_mode_config_reset(dev);
131 * Passing in 16 here will make the RGB656 mode the default
132 * Passing in 32 will use XRGB8888 mode
134 drm_fb_cma_fbdev_init(dev, 16, 0);
135 drm_kms_helper_poll_init(dev);
141 drm_panel_bridge_remove(bridge);
142 drm_mode_config_cleanup(dev);
147 DEFINE_DRM_GEM_CMA_FOPS(drm_fops);
149 static struct drm_driver tve200_drm_driver = {
151 DRIVER_MODESET | DRIVER_GEM | DRIVER_PRIME | DRIVER_ATOMIC,
152 .lastclose = drm_fb_helper_lastclose,
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,
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,
176 static int tve200_probe(struct platform_device *pdev)
178 struct device *dev = &pdev->dev;
179 struct tve200_drm_dev_private *priv;
180 struct drm_device *drm;
181 struct resource *res;
185 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
189 drm = drm_dev_alloc(&tve200_drm_driver, dev);
192 platform_set_drvdata(pdev, drm);
194 drm->dev_private = priv;
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);
203 ret = clk_prepare_enable(priv->pclk);
205 dev_err(dev, "failed to enable PCLK\n");
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);
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__);
225 irq = platform_get_irq(pdev, 0);
231 /* turn off interrupts before requesting the irq */
232 writel(0, priv->regs + TVE200_INT_EN);
234 ret = devm_request_irq(dev, irq, tve200_irq, 0, "tve200", priv);
236 dev_err(dev, "failed to request irq %d\n", ret);
240 ret = tve200_modeset_init(drm);
244 ret = drm_dev_register(drm, 0);
251 clk_disable_unprepare(priv->pclk);
257 static int tve200_remove(struct platform_device *pdev)
259 struct drm_device *drm = platform_get_drvdata(pdev);
260 struct tve200_drm_dev_private *priv = drm->dev_private;
262 drm_dev_unregister(drm);
263 drm_fb_cma_fbdev_fini(drm);
265 drm_panel_bridge_remove(priv->bridge);
266 drm_mode_config_cleanup(drm);
267 clk_disable_unprepare(priv->pclk);
273 static const struct of_device_id tve200_of_match[] = {
275 .compatible = "faraday,tve200",
280 static struct platform_driver tve200_driver = {
283 .of_match_table = of_match_ptr(tve200_of_match),
285 .probe = tve200_probe,
286 .remove = tve200_remove,
288 module_platform_driver(tve200_driver);
290 MODULE_DESCRIPTION(DRIVER_DESC);
291 MODULE_AUTHOR("Linus Walleij <linus.walleij@linaro.org>");
292 MODULE_LICENSE("GPL");