drm/stm: Add STM32 LTDC driver
This controller provides output signals to interface directly a variety of LCD and TFT panels. These output signals are: RGB signals (up to 24bpp), vertical & horizontal synchronisations, data enable and the pixel clock. Reviewed-by: Eric Anholt <eric@anholt.net> Signed-off-by: Yannick Fertre <yannick.fertre@st.com> Signed-off-by: Eric Anholt <eric@anholt.net> Link: http://patchwork.freedesktop.org/patch/msgid/1492164819-10513-5-git-send-email-yannick.fertre@st.com Reviewed-by: Neil Armstrong <narmstrong@baylibre.com> Reviewed-by: Eric Anholt <eric@anholt.net>hifive-unleashed-5.1
Yannick Fertre
Eric Anholt
parent
7121926d4c
commit
b759012c5f
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@ -246,6 +246,8 @@ source "drivers/gpu/drm/fsl-dcu/Kconfig"
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source "drivers/gpu/drm/tegra/Kconfig"
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source "drivers/gpu/drm/stm/Kconfig"
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source "drivers/gpu/drm/panel/Kconfig"
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source "drivers/gpu/drm/bridge/Kconfig"
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@ -82,6 +82,7 @@ obj-$(CONFIG_DRM_BOCHS) += bochs/
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obj-$(CONFIG_DRM_VIRTIO_GPU) += virtio/
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obj-$(CONFIG_DRM_MSM) += msm/
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obj-$(CONFIG_DRM_TEGRA) += tegra/
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obj-$(CONFIG_DRM_STM) += stm/
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obj-$(CONFIG_DRM_STI) += sti/
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obj-$(CONFIG_DRM_IMX) += imx/
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obj-$(CONFIG_DRM_MEDIATEK) += mediatek/
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@ -0,0 +1,16 @@
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config DRM_STM
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tristate "DRM Support for STMicroelectronics SoC Series"
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depends on DRM && (ARCH_STM32 || ARCH_MULTIPLATFORM)
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select DRM_KMS_HELPER
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select DRM_GEM_CMA_HELPER
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select DRM_KMS_CMA_HELPER
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select DRM_PANEL
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select VIDEOMODE_HELPERS
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select FB_PROVIDE_GET_FB_UNMAPPED_AREA
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default y
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help
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Enable support for the on-chip display controller on
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STMicroelectronics STM32 MCUs.
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To compile this driver as a module, choose M here: the module
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will be called stm-drm.
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@ -0,0 +1,7 @@
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ccflags-y := -Iinclude/drm
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stm-drm-y := \
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drv.o \
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ltdc.o
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obj-$(CONFIG_DRM_STM) += stm-drm.o
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@ -0,0 +1,221 @@
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/*
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* Copyright (C) STMicroelectronics SA 2017
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*
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* Authors: Philippe Cornu <philippe.cornu@st.com>
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* Yannick Fertre <yannick.fertre@st.com>
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* Fabien Dessenne <fabien.dessenne@st.com>
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* Mickael Reulier <mickael.reulier@st.com>
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*
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* License terms: GNU General Public License (GPL), version 2
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*/
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#include <linux/component.h>
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#include <linux/of_platform.h>
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#include <drm/drm_atomic.h>
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#include <drm/drm_atomic_helper.h>
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#include <drm/drm_crtc_helper.h>
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#include <drm/drm_fb_cma_helper.h>
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#include <drm/drm_gem_cma_helper.h>
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#include "ltdc.h"
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#define DRIVER_NAME "stm"
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#define DRIVER_DESC "STMicroelectronics SoC DRM"
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#define DRIVER_DATE "20170330"
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#define DRIVER_MAJOR 1
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#define DRIVER_MINOR 0
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#define DRIVER_PATCH_LEVEL 0
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#define STM_MAX_FB_WIDTH 2048
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#define STM_MAX_FB_HEIGHT 2048 /* same as width to handle orientation */
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static void drv_output_poll_changed(struct drm_device *ddev)
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{
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struct ltdc_device *ldev = ddev->dev_private;
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drm_fbdev_cma_hotplug_event(ldev->fbdev);
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}
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static const struct drm_mode_config_funcs drv_mode_config_funcs = {
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.fb_create = drm_fb_cma_create,
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.output_poll_changed = drv_output_poll_changed,
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.atomic_check = drm_atomic_helper_check,
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.atomic_commit = drm_atomic_helper_commit,
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};
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static void drv_lastclose(struct drm_device *ddev)
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{
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struct ltdc_device *ldev = ddev->dev_private;
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DRM_DEBUG("%s\n", __func__);
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drm_fbdev_cma_restore_mode(ldev->fbdev);
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}
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DEFINE_DRM_GEM_CMA_FOPS(drv_driver_fops);
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static struct drm_driver drv_driver = {
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.driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_PRIME |
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DRIVER_ATOMIC,
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.lastclose = drv_lastclose,
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.name = DRIVER_NAME,
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.desc = DRIVER_DESC,
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.date = DRIVER_DATE,
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.major = DRIVER_MAJOR,
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.minor = DRIVER_MINOR,
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.patchlevel = DRIVER_PATCH_LEVEL,
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.fops = &drv_driver_fops,
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.dumb_create = drm_gem_cma_dumb_create,
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.dumb_map_offset = drm_gem_cma_dumb_map_offset,
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.dumb_destroy = drm_gem_dumb_destroy,
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.prime_handle_to_fd = drm_gem_prime_handle_to_fd,
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.prime_fd_to_handle = drm_gem_prime_fd_to_handle,
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.gem_free_object_unlocked = drm_gem_cma_free_object,
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.gem_vm_ops = &drm_gem_cma_vm_ops,
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.gem_prime_export = drm_gem_prime_export,
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.gem_prime_import = drm_gem_prime_import,
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.gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
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.gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
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.gem_prime_vmap = drm_gem_cma_prime_vmap,
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.gem_prime_vunmap = drm_gem_cma_prime_vunmap,
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.gem_prime_mmap = drm_gem_cma_prime_mmap,
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.enable_vblank = ltdc_crtc_enable_vblank,
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.disable_vblank = ltdc_crtc_disable_vblank,
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};
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static int drv_load(struct drm_device *ddev)
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{
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struct platform_device *pdev = to_platform_device(ddev->dev);
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struct drm_fbdev_cma *fbdev;
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struct ltdc_device *ldev;
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int ret;
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DRM_DEBUG("%s\n", __func__);
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ldev = devm_kzalloc(ddev->dev, sizeof(*ldev), GFP_KERNEL);
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if (!ldev)
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return -ENOMEM;
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ddev->dev_private = (void *)ldev;
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drm_mode_config_init(ddev);
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/*
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* set max width and height as default value.
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* this value would be used to check framebuffer size limitation
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* at drm_mode_addfb().
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*/
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ddev->mode_config.min_width = 0;
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ddev->mode_config.min_height = 0;
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ddev->mode_config.max_width = STM_MAX_FB_WIDTH;
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ddev->mode_config.max_height = STM_MAX_FB_HEIGHT;
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ddev->mode_config.funcs = &drv_mode_config_funcs;
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ret = ltdc_load(ddev);
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if (ret)
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goto err;
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drm_mode_config_reset(ddev);
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drm_kms_helper_poll_init(ddev);
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if (ddev->mode_config.num_connector) {
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ldev = ddev->dev_private;
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fbdev = drm_fbdev_cma_init(ddev, 16,
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ddev->mode_config.num_connector);
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if (IS_ERR(fbdev)) {
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DRM_DEBUG("Warning: fails to create fbdev\n");
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fbdev = NULL;
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}
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ldev->fbdev = fbdev;
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}
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platform_set_drvdata(pdev, ddev);
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return 0;
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err:
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drm_mode_config_cleanup(ddev);
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return ret;
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}
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static void drv_unload(struct drm_device *ddev)
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{
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struct ltdc_device *ldev = ddev->dev_private;
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DRM_DEBUG("%s\n", __func__);
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if (ldev->fbdev) {
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drm_fbdev_cma_fini(ldev->fbdev);
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ldev->fbdev = NULL;
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}
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drm_kms_helper_poll_fini(ddev);
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ltdc_unload(ddev);
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drm_mode_config_cleanup(ddev);
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}
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static int stm_drm_platform_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct drm_device *ddev;
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int ret;
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DRM_DEBUG("%s\n", __func__);
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dma_set_coherent_mask(dev, DMA_BIT_MASK(32));
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ddev = drm_dev_alloc(&drv_driver, dev);
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if (IS_ERR(ddev))
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return PTR_ERR(ddev);
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ret = drv_load(ddev);
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if (ret)
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goto err_unref;
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ret = drm_dev_register(ddev, 0);
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if (ret)
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goto err_unref;
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return 0;
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err_unref:
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drm_dev_unref(ddev);
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return ret;
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}
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static int stm_drm_platform_remove(struct platform_device *pdev)
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{
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struct drm_device *ddev = platform_get_drvdata(pdev);
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DRM_DEBUG("%s\n", __func__);
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drm_dev_unregister(ddev);
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drv_unload(ddev);
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drm_dev_unref(ddev);
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return 0;
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}
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static const struct of_device_id drv_dt_ids[] = {
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{ .compatible = "st,stm32-ltdc"},
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{ /* end node */ },
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};
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MODULE_DEVICE_TABLE(of, drv_dt_ids);
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static struct platform_driver stm_drm_platform_driver = {
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.probe = stm_drm_platform_probe,
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.remove = stm_drm_platform_remove,
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.driver = {
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.name = DRIVER_NAME,
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.of_match_table = drv_dt_ids,
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},
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};
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module_platform_driver(stm_drm_platform_driver);
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MODULE_AUTHOR("Philippe Cornu <philippe.cornu@st.com>");
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MODULE_AUTHOR("Yannick Fertre <yannick.fertre@st.com>");
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MODULE_AUTHOR("Fabien Dessenne <fabien.dessenne@st.com>");
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MODULE_AUTHOR("Mickael Reulier <mickael.reulier@st.com>");
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MODULE_DESCRIPTION("STMicroelectronics ST DRM LTDC driver");
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MODULE_LICENSE("GPL v2");
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File diff suppressed because it is too large
Load Diff
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@ -0,0 +1,40 @@
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/*
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* Copyright (C) STMicroelectronics SA 2017
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*
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* Authors: Philippe Cornu <philippe.cornu@st.com>
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* Yannick Fertre <yannick.fertre@st.com>
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* Fabien Dessenne <fabien.dessenne@st.com>
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* Mickael Reulier <mickael.reulier@st.com>
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*
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* License terms: GNU General Public License (GPL), version 2
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*/
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#ifndef _LTDC_H_
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#define _LTDC_H_
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struct ltdc_caps {
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u32 hw_version; /* hardware version */
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u32 nb_layers; /* number of supported layers */
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u32 reg_ofs; /* register offset for applicable regs */
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u32 bus_width; /* bus width (32 or 64 bits) */
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const u32 *pix_fmt_hw; /* supported pixel formats */
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};
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struct ltdc_device {
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struct drm_fbdev_cma *fbdev;
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void __iomem *regs;
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struct clk *pixel_clk; /* lcd pixel clock */
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struct drm_panel *panel;
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struct mutex err_lock; /* protecting error_status */
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struct ltdc_caps caps;
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u32 clut[256]; /* color look up table */
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u32 error_status;
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u32 irq_status;
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};
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int ltdc_crtc_enable_vblank(struct drm_device *dev, unsigned int pipe);
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void ltdc_crtc_disable_vblank(struct drm_device *dev, unsigned int pipe);
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int ltdc_load(struct drm_device *ddev);
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void ltdc_unload(struct drm_device *ddev);
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#endif
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