drivers/gpu/drm/tve200/tve200_drv.c

   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/drmP.h>
  41 #include <drm/drm_atomic_helper.h>
  42 #include <drm/drm_bridge.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
  51 #include "tve200_drm.h"
  52
  53 #define DRIVER_DESC      "DRM module for Faraday TVE200"
  54
  55 static const struct drm_mode_config_funcs mode_config_funcs = {
  56         .fb_create = drm_gem_fb_create,
  57         .atomic_check = drm_atomic_helper_check,
  58         .atomic_commit = drm_atomic_helper_commit,
  59 };
  60
  61 static int tve200_modeset_init(struct drm_device *dev)
  62 {
  63         struct drm_mode_config *mode_config;
  64         struct tve200_drm_dev_private *priv = dev->dev_private;
  65         struct drm_panel *panel;
  66         struct drm_bridge *bridge;
  67         int ret = 0;
  68
  69         drm_mode_config_init(dev);
  70         mode_config = &dev->mode_config;
  71         mode_config->funcs = &mode_config_funcs;
  72         mode_config->min_width = 352;
  73         mode_config->max_width = 720;
  74         mode_config->min_height = 240;
  75         mode_config->max_height = 576;
  76
  77         ret = drm_of_find_panel_or_bridge(dev->dev->of_node,
  78                                           0, 0, &panel, &bridge);
  79         if (ret && ret != -ENODEV)
  80                 return ret;
  81         if (panel) {
  82                 bridge = drm_panel_bridge_add(panel,
  83                                               DRM_MODE_CONNECTOR_Unknown);
  84                 if (IS_ERR(bridge)) {
  85                         ret = PTR_ERR(bridge);
  86                         goto out_bridge;
  87                 }
  88         } else {
  89                 /*
  90                  * TODO: when we are using a different bridge than a panel
  91                  * (such as a dumb VGA connector) we need to devise a different
  92                  * method to get the connector out of the bridge.
  93                  */
  94                 dev_err(dev->dev, "the bridge is not a panel\n");
  95                 goto out_bridge;
  96         }
  97
  98         ret = tve200_display_init(dev);
  99         if (ret) {
 100                 dev_err(dev->dev, "failed to init display\n");
 101                 goto out_bridge;
 102         }
 103
 104         ret = drm_simple_display_pipe_attach_bridge(&priv->pipe,
 105                                                     bridge);
 106         if (ret) {
 107                 dev_err(dev->dev, "failed to attach bridge\n");
 108                 goto out_bridge;
 109         }
 110
 111         priv->panel = panel;
 112         priv->connector = panel->connector;
 113         priv->bridge = bridge;
 114
 115         dev_info(dev->dev, "attached to panel %s\n",
 116                  dev_name(panel->dev));
 117
 118         ret = drm_vblank_init(dev, 1);
 119         if (ret) {
 120                 dev_err(dev->dev, "failed to init vblank\n");
 121                 goto out_bridge;
 122         }
 123
 124         drm_mode_config_reset(dev);
 125         drm_kms_helper_poll_init(dev);
 126
 127         goto finish;
 128
 129 out_bridge:
 130         if (panel)
 131                 drm_panel_bridge_remove(bridge);
 132         drm_mode_config_cleanup(dev);
 133 finish:
 134         return ret;
 135 }
 136
 137 DEFINE_DRM_GEM_CMA_FOPS(drm_fops);
 138
 139 static struct drm_driver tve200_drm_driver = {
 140         .driver_features =
 141                 DRIVER_MODESET | DRIVER_GEM | DRIVER_PRIME | 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_import = drm_gem_prime_import,
 157         .gem_prime_export = drm_gem_prime_export,
 158         .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
 159         .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
 160         .gem_prime_vmap = drm_gem_cma_prime_vmap,
 161         .gem_prime_vunmap = drm_gem_cma_prime_vunmap,
 162         .gem_prime_mmap = drm_gem_cma_prime_mmap,
 163 };
 164
 165 static int tve200_probe(struct platform_device *pdev)
 166 {
 167         struct device *dev = &pdev->dev;
 168         struct tve200_drm_dev_private *priv;
 169         struct drm_device *drm;
 170         struct resource *res;
 171         int irq;
 172         int ret;
 173
 174         priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
 175         if (!priv)
 176                 return -ENOMEM;
 177
 178         drm = drm_dev_alloc(&tve200_drm_driver, dev);
 179         if (IS_ERR(drm))
 180                 return PTR_ERR(drm);
 181         platform_set_drvdata(pdev, drm);
 182         priv->drm = drm;
 183         drm->dev_private = priv;
 184
 185         /* Clock the silicon so we can access the registers */
 186         priv->pclk = devm_clk_get(dev, "PCLK");
 187         if (IS_ERR(priv->pclk)) {
 188                 dev_err(dev, "unable to get PCLK\n");
 189                 ret = PTR_ERR(priv->pclk);
 190                 goto dev_unref;
 191         }
 192         ret = clk_prepare_enable(priv->pclk);
 193         if (ret) {
 194                 dev_err(dev, "failed to enable PCLK\n");
 195                 goto dev_unref;
 196         }
 197
 198         /* This clock is for the pixels (27MHz) */
 199         priv->clk = devm_clk_get(dev, "TVE");
 200         if (IS_ERR(priv->clk)) {
 201                 dev_err(dev, "unable to get TVE clock\n");
 202                 ret = PTR_ERR(priv->clk);
 203                 goto clk_disable;
 204         }
 205
 206         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 207         priv->regs = devm_ioremap_resource(dev, res);
 208         if (IS_ERR(priv->regs)) {
 209                 dev_err(dev, "%s failed mmio\n", __func__);
 210                 ret = -EINVAL;
 211                 goto clk_disable;
 212         }
 213
 214         irq = platform_get_irq(pdev, 0);
 215         if (!irq) {
 216                 ret = -EINVAL;
 217                 goto clk_disable;
 218         }
 219
 220         /* turn off interrupts before requesting the irq */
 221         writel(0, priv->regs + TVE200_INT_EN);
 222
 223         ret = devm_request_irq(dev, irq, tve200_irq, 0, "tve200", priv);
 224         if (ret) {
 225                 dev_err(dev, "failed to request irq %d\n", ret);
 226                 goto clk_disable;
 227         }
 228
 229         ret = tve200_modeset_init(drm);
 230         if (ret)
 231                 goto clk_disable;
 232
 233         ret = drm_dev_register(drm, 0);
 234         if (ret < 0)
 235                 goto clk_disable;
 236
 237         /*
 238          * Passing in 16 here will make the RGB565 mode the default
 239          * Passing in 32 will use XRGB8888 mode
 240          */
 241         drm_fbdev_generic_setup(drm, 16);
 242
 243         return 0;
 244
 245 clk_disable:
 246         clk_disable_unprepare(priv->pclk);
 247 dev_unref:
 248         drm_dev_put(drm);
 249         return ret;
 250 }
 251
 252 static int tve200_remove(struct platform_device *pdev)
 253 {
 254         struct drm_device *drm = platform_get_drvdata(pdev);
 255         struct tve200_drm_dev_private *priv = drm->dev_private;
 256
 257         drm_dev_unregister(drm);
 258         if (priv->panel)
 259                 drm_panel_bridge_remove(priv->bridge);
 260         drm_mode_config_cleanup(drm);
 261         clk_disable_unprepare(priv->pclk);
 262         drm_dev_put(drm);
 263
 264         return 0;
 265 }
 266
 267 static const struct of_device_id tve200_of_match[] = {
 268         {
 269                 .compatible = "faraday,tve200",
 270         },
 271         {},
 272 };
 273
 274 static struct platform_driver tve200_driver = {
 275         .driver = {
 276                 .name           = "tve200",
 277                 .of_match_table = of_match_ptr(tve200_of_match),
 278         },
 279         .probe = tve200_probe,
 280         .remove = tve200_remove,
 281 };
 282 module_platform_driver(tve200_driver);
 283
 284 MODULE_DESCRIPTION(DRIVER_DESC);
 285 MODULE_AUTHOR("Linus Walleij <linus.walleij@linaro.org>");
 286 MODULE_LICENSE("GPL");