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1// SPDX-License-Identifier: GPL-2.0-only2/*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 Corporation7 * Copyright (C) 2007 Amos Lee <amos_lee@storlinksemi.com>8 * Copyright (C) 2007 Dave Airlie <airlied@linux.ie>9 * Copyright (C) 2011 Texas Instruments10 * Copyright (C) 2017 Eric Anholt11 */12 13/**14 * DOC: Faraday TV Encoder TVE200 DRM Driver15 *16 * The Faraday TV Encoder TVE200 is also known as the Gemini TV Interface17 * Controller (TVC) and is found in the Gemini Chipset from Storlink18 * Semiconductor (later Storm Semiconductor, later Cortina Systems)19 * but also in the Grain Media GM8180 chipset. On the Gemini the module20 * is connected to 8 data lines and a single clock line, comprising an21 * 8-bit BT.656 interface.22 *23 * This is a very basic YUV display driver. The datasheet specifies that24 * it supports the ITU BT.656 standard. It requires a 27 MHz clock which is25 * 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 panel92 * (such as a dumb VGA connector) we need to devise a different93 * 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 default226 * Passing in 32 will use XRGB8888 mode227 */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");279