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>
diff --git a/drivers/gpu/drm/stm/drv.c b/drivers/gpu/drm/stm/drv.c
new file mode 100644
index 0000000..83ab48f
--- /dev/null
+++ b/drivers/gpu/drm/stm/drv.c
@@ -0,0 +1,221 @@
+/*
+ * Copyright (C) STMicroelectronics SA 2017
+ *
+ * Authors: Philippe Cornu <philippe.cornu@st.com>
+ * Yannick Fertre <yannick.fertre@st.com>
+ * Fabien Dessenne <fabien.dessenne@st.com>
+ * Mickael Reulier <mickael.reulier@st.com>
+ *
+ * License terms: GNU General Public License (GPL), version 2
+ */
+
+#include <linux/component.h>
+#include <linux/of_platform.h>
+
+#include <drm/drm_atomic.h>
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_crtc_helper.h>
+#include <drm/drm_fb_cma_helper.h>
+#include <drm/drm_gem_cma_helper.h>
+
+#include "ltdc.h"
+
+#define DRIVER_NAME "stm"
+#define DRIVER_DESC "STMicroelectronics SoC DRM"
+#define DRIVER_DATE "20170330"
+#define DRIVER_MAJOR 1
+#define DRIVER_MINOR 0
+#define DRIVER_PATCH_LEVEL 0
+
+#define STM_MAX_FB_WIDTH 2048
+#define STM_MAX_FB_HEIGHT 2048 /* same as width to handle orientation */
+
+static void drv_output_poll_changed(struct drm_device *ddev)
+{
+ struct ltdc_device *ldev = ddev->dev_private;
+
+ drm_fbdev_cma_hotplug_event(ldev->fbdev);
+}
+
+static const struct drm_mode_config_funcs drv_mode_config_funcs = {
+ .fb_create = drm_fb_cma_create,
+ .output_poll_changed = drv_output_poll_changed,
+ .atomic_check = drm_atomic_helper_check,
+ .atomic_commit = drm_atomic_helper_commit,
+};
+
+static void drv_lastclose(struct drm_device *ddev)
+{
+ struct ltdc_device *ldev = ddev->dev_private;
+
+ DRM_DEBUG("%s\n", __func__);
+
+ drm_fbdev_cma_restore_mode(ldev->fbdev);
+}
+
+DEFINE_DRM_GEM_CMA_FOPS(drv_driver_fops);
+
+static struct drm_driver drv_driver = {
+ .driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_PRIME |
+ DRIVER_ATOMIC,
+ .lastclose = drv_lastclose,
+ .name = DRIVER_NAME,
+ .desc = DRIVER_DESC,
+ .date = DRIVER_DATE,
+ .major = DRIVER_MAJOR,
+ .minor = DRIVER_MINOR,
+ .patchlevel = DRIVER_PATCH_LEVEL,
+ .fops = &drv_driver_fops,
+ .dumb_create = drm_gem_cma_dumb_create,
+ .dumb_map_offset = drm_gem_cma_dumb_map_offset,
+ .dumb_destroy = drm_gem_dumb_destroy,
+ .prime_handle_to_fd = drm_gem_prime_handle_to_fd,
+ .prime_fd_to_handle = drm_gem_prime_fd_to_handle,
+ .gem_free_object_unlocked = drm_gem_cma_free_object,
+ .gem_vm_ops = &drm_gem_cma_vm_ops,
+ .gem_prime_export = drm_gem_prime_export,
+ .gem_prime_import = drm_gem_prime_import,
+ .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,
+ .enable_vblank = ltdc_crtc_enable_vblank,
+ .disable_vblank = ltdc_crtc_disable_vblank,
+};
+
+static int drv_load(struct drm_device *ddev)
+{
+ struct platform_device *pdev = to_platform_device(ddev->dev);
+ struct drm_fbdev_cma *fbdev;
+ struct ltdc_device *ldev;
+ int ret;
+
+ DRM_DEBUG("%s\n", __func__);
+
+ ldev = devm_kzalloc(ddev->dev, sizeof(*ldev), GFP_KERNEL);
+ if (!ldev)
+ return -ENOMEM;
+
+ ddev->dev_private = (void *)ldev;
+
+ drm_mode_config_init(ddev);
+
+ /*
+ * set max width and height as default value.
+ * this value would be used to check framebuffer size limitation
+ * at drm_mode_addfb().
+ */
+ ddev->mode_config.min_width = 0;
+ ddev->mode_config.min_height = 0;
+ ddev->mode_config.max_width = STM_MAX_FB_WIDTH;
+ ddev->mode_config.max_height = STM_MAX_FB_HEIGHT;
+ ddev->mode_config.funcs = &drv_mode_config_funcs;
+
+ ret = ltdc_load(ddev);
+ if (ret)
+ goto err;
+
+ drm_mode_config_reset(ddev);
+ drm_kms_helper_poll_init(ddev);
+
+ if (ddev->mode_config.num_connector) {
+ ldev = ddev->dev_private;
+ fbdev = drm_fbdev_cma_init(ddev, 16,
+ ddev->mode_config.num_connector);
+ if (IS_ERR(fbdev)) {
+ DRM_DEBUG("Warning: fails to create fbdev\n");
+ fbdev = NULL;
+ }
+ ldev->fbdev = fbdev;
+ }
+
+ platform_set_drvdata(pdev, ddev);
+
+ return 0;
+err:
+ drm_mode_config_cleanup(ddev);
+ return ret;
+}
+
+static void drv_unload(struct drm_device *ddev)
+{
+ struct ltdc_device *ldev = ddev->dev_private;
+
+ DRM_DEBUG("%s\n", __func__);
+
+ if (ldev->fbdev) {
+ drm_fbdev_cma_fini(ldev->fbdev);
+ ldev->fbdev = NULL;
+ }
+ drm_kms_helper_poll_fini(ddev);
+ ltdc_unload(ddev);
+ drm_mode_config_cleanup(ddev);
+}
+
+static int stm_drm_platform_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct drm_device *ddev;
+ int ret;
+
+ DRM_DEBUG("%s\n", __func__);
+
+ dma_set_coherent_mask(dev, DMA_BIT_MASK(32));
+
+ ddev = drm_dev_alloc(&drv_driver, dev);
+ if (IS_ERR(ddev))
+ return PTR_ERR(ddev);
+
+ ret = drv_load(ddev);
+ if (ret)
+ goto err_unref;
+
+ ret = drm_dev_register(ddev, 0);
+ if (ret)
+ goto err_unref;
+
+ return 0;
+
+err_unref:
+ drm_dev_unref(ddev);
+
+ return ret;
+}
+
+static int stm_drm_platform_remove(struct platform_device *pdev)
+{
+ struct drm_device *ddev = platform_get_drvdata(pdev);
+
+ DRM_DEBUG("%s\n", __func__);
+
+ drm_dev_unregister(ddev);
+ drv_unload(ddev);
+ drm_dev_unref(ddev);
+
+ return 0;
+}
+
+static const struct of_device_id drv_dt_ids[] = {
+ { .compatible = "st,stm32-ltdc"},
+ { /* end node */ },
+};
+MODULE_DEVICE_TABLE(of, drv_dt_ids);
+
+static struct platform_driver stm_drm_platform_driver = {
+ .probe = stm_drm_platform_probe,
+ .remove = stm_drm_platform_remove,
+ .driver = {
+ .name = DRIVER_NAME,
+ .of_match_table = drv_dt_ids,
+ },
+};
+
+module_platform_driver(stm_drm_platform_driver);
+
+MODULE_AUTHOR("Philippe Cornu <philippe.cornu@st.com>");
+MODULE_AUTHOR("Yannick Fertre <yannick.fertre@st.com>");
+MODULE_AUTHOR("Fabien Dessenne <fabien.dessenne@st.com>");
+MODULE_AUTHOR("Mickael Reulier <mickael.reulier@st.com>");
+MODULE_DESCRIPTION("STMicroelectronics ST DRM LTDC driver");
+MODULE_LICENSE("GPL v2");