drivers/gpu/drm/tve200/tve200_drv.c

   1 /*
   2  * Copyright (C) 2017 Linus Walleij <linus.walleij@linaro.org>
   3  * Parts of this file were based on sources as follows:
   4  *
   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
  10  *
  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
  14  * such GNU licence.
  15  */
  16
  17 /**
  18  * DOC: Faraday TV Encoder TVE200 DRM Driver
  19  *
  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.
  26  *
  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.
  30  *
  31  * This driver exposes a standard KMS interface for this TV encoder.
  32  */
  33
  34 #include <linux/clk.h>
  35 #include <linux/dma-buf.h>
  36 #include <linux/irq.h>
  37 #include <linux/io.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>
  43
  44 #include <drm/drmP.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>
  54
  55 #include "tve200_drm.h"
  56
  57 #define DRIVER_DESC      "DRM module for Faraday TVE200"
  58
  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,
  63 };
  64
  65 static int tve200_modeset_init(struct drm_device *dev)
  66 {
  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;
  71         int ret = 0;
  72
  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;
  80
  81         ret = drm_of_find_panel_or_bridge(dev->dev->of_node,
  82                                           0, 0, &panel, &bridge);
  83         if (ret && ret != -ENODEV)
  84                 return ret;
  85         if (panel) {
  86                 bridge = drm_panel_bridge_add(panel,
  87                                               DRM_MODE_CONNECTOR_Unknown);
  88                 if (IS_ERR(bridge)) {
  89                         ret = PTR_ERR(bridge);
  90                         goto out_bridge;
  91                 }
  92         } else {
  93                 /*
  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.
  97                  */
  98                 dev_err(dev->dev, "the bridge is not a panel\n");
  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 = panel->connector;
 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
 133 out_bridge:
 134         if (panel)
 135                 drm_panel_bridge_remove(bridge);
 136         drm_mode_config_cleanup(dev);
 137 finish:
 138         return ret;
 139 }
 140
 141 DEFINE_DRM_GEM_CMA_FOPS(drm_fops);
 142
 143 static struct drm_driver tve200_drm_driver = {
 144         .driver_features =
 145                 DRIVER_MODESET | DRIVER_GEM | DRIVER_PRIME | DRIVER_ATOMIC,
 146         .ioctls = NULL,
 147         .fops = &drm_fops,
 148         .name = "tve200",
 149         .desc = DRIVER_DESC,
 150         .date = "20170703",
 151         .major = 1,
 152         .minor = 0,
 153         .patchlevel = 0,
 154         .dumb_create = drm_gem_cma_dumb_create,
 155         .gem_free_object_unlocked = drm_gem_cma_free_object,
 156         .gem_vm_ops = &drm_gem_cma_vm_ops,
 157
 158         .prime_handle_to_fd = drm_gem_prime_handle_to_fd,
 159         .prime_fd_to_handle = drm_gem_prime_fd_to_handle,
 160         .gem_prime_import = drm_gem_prime_import,
 161         .gem_prime_export = drm_gem_prime_export,
 162         .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
 163         .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
 164         .gem_prime_vmap = drm_gem_cma_prime_vmap,
 165         .gem_prime_vunmap = drm_gem_cma_prime_vunmap,
 166         .gem_prime_mmap = drm_gem_cma_prime_mmap,
 167 };
 168
 169 static int tve200_probe(struct platform_device *pdev)
 170 {
 171         struct device *dev = &pdev->dev;
 172         struct tve200_drm_dev_private *priv;
 173         struct drm_device *drm;
 174         struct resource *res;
 175         int irq;
 176         int ret;
 177
 178         priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
 179         if (!priv)
 180                 return -ENOMEM;
 181
 182         drm = drm_dev_alloc(&tve200_drm_driver, dev);
 183         if (IS_ERR(drm))
 184                 return PTR_ERR(drm);
 185         platform_set_drvdata(pdev, drm);
 186         priv->drm = drm;
 187         drm->dev_private = priv;
 188
 189         /* Clock the silicon so we can access the registers */
 190         priv->pclk = devm_clk_get(dev, "PCLK");
 191         if (IS_ERR(priv->pclk)) {
 192                 dev_err(dev, "unable to get PCLK\n");
 193                 ret = PTR_ERR(priv->pclk);
 194                 goto dev_unref;
 195         }
 196         ret = clk_prepare_enable(priv->pclk);
 197         if (ret) {
 198                 dev_err(dev, "failed to enable PCLK\n");
 199                 goto dev_unref;
 200         }
 201
 202         /* This clock is for the pixels (27MHz) */
 203         priv->clk = devm_clk_get(dev, "TVE");
 204         if (IS_ERR(priv->clk)) {
 205                 dev_err(dev, "unable to get TVE clock\n");
 206                 ret = PTR_ERR(priv->clk);
 207                 goto clk_disable;
 208         }
 209
 210         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 211         priv->regs = devm_ioremap_resource(dev, res);
 212         if (IS_ERR(priv->regs)) {
 213                 dev_err(dev, "%s failed mmio\n", __func__);
 214                 ret = -EINVAL;
 215                 goto clk_disable;
 216         }
 217
 218         irq = platform_get_irq(pdev, 0);
 219         if (!irq) {
 220                 ret = -EINVAL;
 221                 goto clk_disable;
 222         }
 223
 224         /* turn off interrupts before requesting the irq */
 225         writel(0, priv->regs + TVE200_INT_EN);
 226
 227         ret = devm_request_irq(dev, irq, tve200_irq, 0, "tve200", priv);
 228         if (ret) {
 229                 dev_err(dev, "failed to request irq %d\n", ret);
 230                 goto clk_disable;
 231         }
 232
 233         ret = tve200_modeset_init(drm);
 234         if (ret)
 235                 goto clk_disable;
 236
 237         ret = drm_dev_register(drm, 0);
 238         if (ret < 0)
 239                 goto clk_disable;
 240
 241         /*
 242          * Passing in 16 here will make the RGB565 mode the default
 243          * Passing in 32 will use XRGB8888 mode
 244          */
 245         drm_fbdev_generic_setup(drm, 16);
 246
 247         return 0;
 248
 249 clk_disable:
 250         clk_disable_unprepare(priv->pclk);
 251 dev_unref:
 252         drm_dev_unref(drm);
 253         return ret;
 254 }
 255
 256 static int tve200_remove(struct platform_device *pdev)
 257 {
 258         struct drm_device *drm = platform_get_drvdata(pdev);
 259         struct tve200_drm_dev_private *priv = drm->dev_private;
 260
 261         drm_dev_unregister(drm);
 262         if (priv->panel)
 263                 drm_panel_bridge_remove(priv->bridge);
 264         drm_mode_config_cleanup(drm);
 265         clk_disable_unprepare(priv->pclk);
 266         drm_dev_unref(drm);
 267
 268         return 0;
 269 }
 270
 271 static const struct of_device_id tve200_of_match[] = {
 272         {
 273                 .compatible = "faraday,tve200",
 274         },
 275         {},
 276 };
 277
 278 static struct platform_driver tve200_driver = {
 279         .driver = {
 280                 .name           = "tve200",
 281                 .of_match_table = of_match_ptr(tve200_of_match),
 282         },
 283         .probe = tve200_probe,
 284         .remove = tve200_remove,
 285 };
 286 module_platform_driver(tve200_driver);
 287
 288 MODULE_DESCRIPTION(DRIVER_DESC);
 289 MODULE_AUTHOR("Linus Walleij <linus.walleij@linaro.org>");
 290 MODULE_LICENSE("GPL");