| // SPDX-License-Identifier: GPL-2.0-only |
| /* |
| * Copyright (C) 2017 Linus Walleij <linus.walleij@linaro.org> |
| * Parts of this file were based on sources as follows: |
| * |
| * Copyright (C) 2006-2008 Intel Corporation |
| * Copyright (C) 2007 Amos Lee <amos_lee@storlinksemi.com> |
| * Copyright (C) 2007 Dave Airlie <airlied@linux.ie> |
| * Copyright (C) 2011 Texas Instruments |
| * Copyright (C) 2017 Eric Anholt |
| */ |
| |
| /** |
| * DOC: Faraday TV Encoder TVE200 DRM Driver |
| * |
| * The Faraday TV Encoder TVE200 is also known as the Gemini TV Interface |
| * Controller (TVC) and is found in the Gemini Chipset from Storlink |
| * Semiconductor (later Storm Semiconductor, later Cortina Systems) |
| * but also in the Grain Media GM8180 chipset. On the Gemini the module |
| * is connected to 8 data lines and a single clock line, comprising an |
| * 8-bit BT.656 interface. |
| * |
| * This is a very basic YUV display driver. The datasheet specifies that |
| * it supports the ITU BT.656 standard. It requires a 27 MHz clock which is |
| * the hallmark of any TV encoder supporting both PAL and NTSC. |
| * |
| * This driver exposes a standard KMS interface for this TV encoder. |
| */ |
| |
| #include <linux/clk.h> |
| #include <linux/dma-buf.h> |
| #include <linux/irq.h> |
| #include <linux/io.h> |
| #include <linux/module.h> |
| #include <linux/platform_device.h> |
| #include <linux/shmem_fs.h> |
| #include <linux/slab.h> |
| #include <linux/version.h> |
| |
| #include <drm/drm_atomic_helper.h> |
| #include <drm/drm_bridge.h> |
| #include <drm/drm_drv.h> |
| #include <drm/drm_fb_cma_helper.h> |
| #include <drm/drm_fb_helper.h> |
| #include <drm/drm_gem_cma_helper.h> |
| #include <drm/drm_gem_framebuffer_helper.h> |
| #include <drm/drm_of.h> |
| #include <drm/drm_panel.h> |
| #include <drm/drm_probe_helper.h> |
| #include <drm/drm_vblank.h> |
| |
| #include "tve200_drm.h" |
| |
| #define DRIVER_DESC "DRM module for Faraday TVE200" |
| |
| static const struct drm_mode_config_funcs mode_config_funcs = { |
| .fb_create = drm_gem_fb_create, |
| .atomic_check = drm_atomic_helper_check, |
| .atomic_commit = drm_atomic_helper_commit, |
| }; |
| |
| static int tve200_modeset_init(struct drm_device *dev) |
| { |
| struct drm_mode_config *mode_config; |
| struct tve200_drm_dev_private *priv = dev->dev_private; |
| struct drm_panel *panel; |
| struct drm_bridge *bridge; |
| int ret = 0; |
| |
| drm_mode_config_init(dev); |
| mode_config = &dev->mode_config; |
| mode_config->funcs = &mode_config_funcs; |
| mode_config->min_width = 352; |
| mode_config->max_width = 720; |
| mode_config->min_height = 240; |
| mode_config->max_height = 576; |
| |
| ret = drm_of_find_panel_or_bridge(dev->dev->of_node, |
| 0, 0, &panel, &bridge); |
| if (ret && ret != -ENODEV) |
| return ret; |
| if (panel) { |
| bridge = drm_panel_bridge_add_typed(panel, |
| DRM_MODE_CONNECTOR_Unknown); |
| if (IS_ERR(bridge)) { |
| ret = PTR_ERR(bridge); |
| goto out_bridge; |
| } |
| } else { |
| /* |
| * TODO: when we are using a different bridge than a panel |
| * (such as a dumb VGA connector) we need to devise a different |
| * method to get the connector out of the bridge. |
| */ |
| dev_err(dev->dev, "the bridge is not a panel\n"); |
| goto out_bridge; |
| } |
| |
| ret = tve200_display_init(dev); |
| if (ret) { |
| dev_err(dev->dev, "failed to init display\n"); |
| goto out_bridge; |
| } |
| |
| ret = drm_simple_display_pipe_attach_bridge(&priv->pipe, |
| bridge); |
| if (ret) { |
| dev_err(dev->dev, "failed to attach bridge\n"); |
| goto out_bridge; |
| } |
| |
| priv->panel = panel; |
| priv->connector = drm_panel_bridge_connector(bridge); |
| priv->bridge = bridge; |
| |
| dev_info(dev->dev, "attached to panel %s\n", |
| dev_name(panel->dev)); |
| |
| ret = drm_vblank_init(dev, 1); |
| if (ret) { |
| dev_err(dev->dev, "failed to init vblank\n"); |
| goto out_bridge; |
| } |
| |
| drm_mode_config_reset(dev); |
| drm_kms_helper_poll_init(dev); |
| |
| goto finish; |
| |
| out_bridge: |
| if (panel) |
| drm_panel_bridge_remove(bridge); |
| drm_mode_config_cleanup(dev); |
| finish: |
| return ret; |
| } |
| |
| DEFINE_DRM_GEM_CMA_FOPS(drm_fops); |
| |
| static struct drm_driver tve200_drm_driver = { |
| .driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_ATOMIC, |
| .ioctls = NULL, |
| .fops = &drm_fops, |
| .name = "tve200", |
| .desc = DRIVER_DESC, |
| .date = "20170703", |
| .major = 1, |
| .minor = 0, |
| .patchlevel = 0, |
| .dumb_create = drm_gem_cma_dumb_create, |
| .gem_free_object_unlocked = drm_gem_cma_free_object, |
| .gem_vm_ops = &drm_gem_cma_vm_ops, |
| |
| .prime_handle_to_fd = drm_gem_prime_handle_to_fd, |
| .prime_fd_to_handle = drm_gem_prime_fd_to_handle, |
| .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table, |
| .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table, |
| .gem_prime_vmap = drm_gem_cma_prime_vmap, |
| .gem_prime_vunmap = drm_gem_cma_prime_vunmap, |
| .gem_prime_mmap = drm_gem_cma_prime_mmap, |
| }; |
| |
| static int tve200_probe(struct platform_device *pdev) |
| { |
| struct device *dev = &pdev->dev; |
| struct tve200_drm_dev_private *priv; |
| struct drm_device *drm; |
| struct resource *res; |
| int irq; |
| int ret; |
| |
| priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); |
| if (!priv) |
| return -ENOMEM; |
| |
| drm = drm_dev_alloc(&tve200_drm_driver, dev); |
| if (IS_ERR(drm)) |
| return PTR_ERR(drm); |
| platform_set_drvdata(pdev, drm); |
| priv->drm = drm; |
| drm->dev_private = priv; |
| |
| /* Clock the silicon so we can access the registers */ |
| priv->pclk = devm_clk_get(dev, "PCLK"); |
| if (IS_ERR(priv->pclk)) { |
| dev_err(dev, "unable to get PCLK\n"); |
| ret = PTR_ERR(priv->pclk); |
| goto dev_unref; |
| } |
| ret = clk_prepare_enable(priv->pclk); |
| if (ret) { |
| dev_err(dev, "failed to enable PCLK\n"); |
| goto dev_unref; |
| } |
| |
| /* This clock is for the pixels (27MHz) */ |
| priv->clk = devm_clk_get(dev, "TVE"); |
| if (IS_ERR(priv->clk)) { |
| dev_err(dev, "unable to get TVE clock\n"); |
| ret = PTR_ERR(priv->clk); |
| goto clk_disable; |
| } |
| |
| res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| priv->regs = devm_ioremap_resource(dev, res); |
| if (IS_ERR(priv->regs)) { |
| dev_err(dev, "%s failed mmio\n", __func__); |
| ret = -EINVAL; |
| goto clk_disable; |
| } |
| |
| irq = platform_get_irq(pdev, 0); |
| if (!irq) { |
| ret = -EINVAL; |
| goto clk_disable; |
| } |
| |
| /* turn off interrupts before requesting the irq */ |
| writel(0, priv->regs + TVE200_INT_EN); |
| |
| ret = devm_request_irq(dev, irq, tve200_irq, 0, "tve200", priv); |
| if (ret) { |
| dev_err(dev, "failed to request irq %d\n", ret); |
| goto clk_disable; |
| } |
| |
| ret = tve200_modeset_init(drm); |
| if (ret) |
| goto clk_disable; |
| |
| ret = drm_dev_register(drm, 0); |
| if (ret < 0) |
| goto clk_disable; |
| |
| /* |
| * Passing in 16 here will make the RGB565 mode the default |
| * Passing in 32 will use XRGB8888 mode |
| */ |
| drm_fbdev_generic_setup(drm, 16); |
| |
| return 0; |
| |
| clk_disable: |
| clk_disable_unprepare(priv->pclk); |
| dev_unref: |
| drm_dev_put(drm); |
| return ret; |
| } |
| |
| static int tve200_remove(struct platform_device *pdev) |
| { |
| struct drm_device *drm = platform_get_drvdata(pdev); |
| struct tve200_drm_dev_private *priv = drm->dev_private; |
| |
| drm_dev_unregister(drm); |
| if (priv->panel) |
| drm_panel_bridge_remove(priv->bridge); |
| drm_mode_config_cleanup(drm); |
| clk_disable_unprepare(priv->pclk); |
| drm_dev_put(drm); |
| |
| return 0; |
| } |
| |
| static const struct of_device_id tve200_of_match[] = { |
| { |
| .compatible = "faraday,tve200", |
| }, |
| {}, |
| }; |
| |
| static struct platform_driver tve200_driver = { |
| .driver = { |
| .name = "tve200", |
| .of_match_table = of_match_ptr(tve200_of_match), |
| }, |
| .probe = tve200_probe, |
| .remove = tve200_remove, |
| }; |
| module_platform_driver(tve200_driver); |
| |
| MODULE_DESCRIPTION(DRIVER_DESC); |
| MODULE_AUTHOR("Linus Walleij <linus.walleij@linaro.org>"); |
| MODULE_LICENSE("GPL"); |