1 files changed, 221 insertions, 0 deletions

diff --git a/drivers/gpu/drm/stm/drv.c b/drivers/gpu/drm/stm/drv.c
new file mode 100644
index 000000000000..83ab48f1fd00
--- /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");