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 56 static 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 62 static 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_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 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 = drm_panel_bridge_connector(bridge); 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; 129 130 out_bridge: 131 if (panel) 132 drm_panel_bridge_remove(bridge); 133 drm_mode_config_cleanup(dev); 134 finish: 135 return ret; 136 } 137 138 DEFINE_DRM_GEM_CMA_FOPS(drm_fops); 139 140 static 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 }; 162 163 static 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; 242 243 clk_disable: 244 clk_disable_unprepare(priv->pclk); 245 dev_unref: 246 drm_dev_put(drm); 247 return ret; 248 } 249 250 static 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 } 264 265 static const struct of_device_id tve200_of_match[] = { 266 { 267 .compatible = "faraday,tve200", 268 }, 269 {}, 270 }; 271 272 static 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 }; 280 module_platform_driver(tve200_driver); 281 282 MODULE_DESCRIPTION(DRIVER_DESC); 283 MODULE_AUTHOR("Linus Walleij <linus.walleij@linaro.org>"); 284 MODULE_LICENSE("GPL"); 285