drm: Add support of ARC PGU display controller
ARC PGU could be found on some development boards from Synopsys.
This is a simple byte streamer that reads data from a framebuffer
and sends data to the single encoder.
Signed-off-by: Carlos Palminha <palminha@synopsys.com>
Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
Cc: David Airlie <airlied@linux.ie>
Cc: dri-devel@lists.freedesktop.org
Cc: linux-snps-arc@lists.infradead.org
diff --git a/drivers/gpu/drm/arc/arcpgu_drv.c b/drivers/gpu/drm/arc/arcpgu_drv.c
new file mode 100644
index 0000000..5b35e5d
--- /dev/null
+++ b/drivers/gpu/drm/arc/arcpgu_drv.c
@@ -0,0 +1,282 @@
+/*
+ * ARC PGU DRM driver.
+ *
+ * Copyright (C) 2016 Synopsys, Inc. (www.synopsys.com)
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <linux/clk.h>
+#include <drm/drm_crtc_helper.h>
+#include <drm/drm_fb_cma_helper.h>
+#include <drm/drm_gem_cma_helper.h>
+#include <drm/drm_atomic_helper.h>
+
+#include "arcpgu.h"
+#include "arcpgu_regs.h"
+
+static void arcpgu_fb_output_poll_changed(struct drm_device *dev)
+{
+ struct arcpgu_drm_private *arcpgu = dev->dev_private;
+
+ if (arcpgu->fbdev)
+ drm_fbdev_cma_hotplug_event(arcpgu->fbdev);
+}
+
+static int arcpgu_atomic_commit(struct drm_device *dev,
+ struct drm_atomic_state *state, bool async)
+{
+ return drm_atomic_helper_commit(dev, state, false);
+}
+
+static struct drm_mode_config_funcs arcpgu_drm_modecfg_funcs = {
+ .fb_create = drm_fb_cma_create,
+ .output_poll_changed = arcpgu_fb_output_poll_changed,
+ .atomic_check = drm_atomic_helper_check,
+ .atomic_commit = arcpgu_atomic_commit,
+};
+
+static void arcpgu_setup_mode_config(struct drm_device *drm)
+{
+ drm_mode_config_init(drm);
+ drm->mode_config.min_width = 0;
+ drm->mode_config.min_height = 0;
+ drm->mode_config.max_width = 1920;
+ drm->mode_config.max_height = 1080;
+ drm->mode_config.funcs = &arcpgu_drm_modecfg_funcs;
+}
+
+int arcpgu_gem_mmap(struct file *filp, struct vm_area_struct *vma)
+{
+ int ret;
+
+ ret = drm_gem_mmap(filp, vma);
+ if (ret)
+ return ret;
+
+ vma->vm_page_prot = pgprot_noncached(vm_get_page_prot(vma->vm_flags));
+ return 0;
+}
+
+static const struct file_operations arcpgu_drm_ops = {
+ .owner = THIS_MODULE,
+ .open = drm_open,
+ .release = drm_release,
+ .unlocked_ioctl = drm_ioctl,
+#ifdef CONFIG_COMPAT
+ .compat_ioctl = drm_compat_ioctl,
+#endif
+ .poll = drm_poll,
+ .read = drm_read,
+ .llseek = no_llseek,
+ .mmap = arcpgu_gem_mmap,
+};
+
+static void arcpgu_preclose(struct drm_device *drm, struct drm_file *file)
+{
+ struct arcpgu_drm_private *arcpgu = drm->dev_private;
+ struct drm_pending_vblank_event *e, *t;
+ unsigned long flags;
+
+ spin_lock_irqsave(&drm->event_lock, flags);
+ list_for_each_entry_safe(e, t, &arcpgu->event_list, base.link) {
+ if (e->base.file_priv != file)
+ continue;
+ list_del(&e->base.link);
+ e->base.destroy(&e->base);
+ }
+ spin_unlock_irqrestore(&drm->event_lock, flags);
+}
+
+static void arcpgu_lastclose(struct drm_device *drm)
+{
+ struct arcpgu_drm_private *arcpgu = drm->dev_private;
+
+ drm_fbdev_cma_restore_mode(arcpgu->fbdev);
+}
+
+static int arcpgu_load(struct drm_device *drm)
+{
+ struct platform_device *pdev = to_platform_device(drm->dev);
+ struct arcpgu_drm_private *arcpgu;
+ struct device_node *encoder_node;
+ struct resource *res;
+ int ret;
+
+ arcpgu = devm_kzalloc(&pdev->dev, sizeof(*arcpgu), GFP_KERNEL);
+ if (arcpgu == NULL)
+ return -ENOMEM;
+
+ drm->dev_private = arcpgu;
+
+ arcpgu->clk = devm_clk_get(drm->dev, "pxlclk");
+ if (IS_ERR(arcpgu->clk))
+ return PTR_ERR(arcpgu->clk);
+
+ INIT_LIST_HEAD(&arcpgu->event_list);
+
+ arcpgu_setup_mode_config(drm);
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ arcpgu->regs = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(arcpgu->regs)) {
+ dev_err(drm->dev, "Could not remap IO mem\n");
+ return PTR_ERR(arcpgu->regs);
+ }
+
+ dev_info(drm->dev, "arc_pgu ID: 0x%x\n",
+ arc_pgu_read(arcpgu, ARCPGU_REG_ID));
+
+ if (dma_set_mask_and_coherent(drm->dev, DMA_BIT_MASK(32)))
+ return -ENODEV;
+
+ if (arc_pgu_setup_crtc(drm) < 0)
+ return -ENODEV;
+
+ /* find the encoder node and initialize it */
+ encoder_node = of_parse_phandle(drm->dev->of_node, "encoder-slave", 0);
+ if (!encoder_node) {
+ dev_err(drm->dev, "failed to get an encoder slave node\n");
+ return -ENODEV;
+ }
+
+ ret = arcpgu_drm_hdmi_init(drm, encoder_node);
+ if (ret < 0)
+ return ret;
+
+ drm_mode_config_reset(drm);
+ drm_kms_helper_poll_init(drm);
+
+ arcpgu->fbdev = drm_fbdev_cma_init(drm, 16,
+ drm->mode_config.num_crtc,
+ drm->mode_config.num_connector);
+ if (IS_ERR(arcpgu->fbdev)) {
+ ret = PTR_ERR(arcpgu->fbdev);
+ arcpgu->fbdev = NULL;
+ return -ENODEV;
+ }
+
+ platform_set_drvdata(pdev, arcpgu);
+ return 0;
+}
+
+int arcpgu_unload(struct drm_device *drm)
+{
+ struct arcpgu_drm_private *arcpgu = drm->dev_private;
+
+ if (arcpgu->fbdev) {
+ drm_fbdev_cma_fini(arcpgu->fbdev);
+ arcpgu->fbdev = NULL;
+ }
+ drm_kms_helper_poll_fini(drm);
+ drm_vblank_cleanup(drm);
+ drm_mode_config_cleanup(drm);
+
+ return 0;
+}
+
+static struct drm_driver arcpgu_drm_driver = {
+ .driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_PRIME |
+ DRIVER_ATOMIC,
+ .preclose = arcpgu_preclose,
+ .lastclose = arcpgu_lastclose,
+ .name = "drm-arcpgu",
+ .desc = "ARC PGU Controller",
+ .date = "20160219",
+ .major = 1,
+ .minor = 0,
+ .patchlevel = 0,
+ .fops = &arcpgu_drm_ops,
+ .dumb_create = drm_gem_cma_dumb_create,
+ .dumb_map_offset = drm_gem_cma_dumb_map_offset,
+ .dumb_destroy = drm_gem_dumb_destroy,
+ .get_vblank_counter = drm_vblank_no_hw_counter,
+ .prime_handle_to_fd = drm_gem_prime_handle_to_fd,
+ .prime_fd_to_handle = drm_gem_prime_fd_to_handle,
+ .gem_free_object = 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,
+};
+
+static int arcpgu_probe(struct platform_device *pdev)
+{
+ struct drm_device *drm;
+ int ret;
+
+ drm = drm_dev_alloc(&arcpgu_drm_driver, &pdev->dev);
+ if (!drm)
+ return -ENOMEM;
+
+ ret = arcpgu_load(drm);
+ if (ret)
+ goto err_unref;
+
+ ret = drm_dev_register(drm, 0);
+ if (ret)
+ goto err_unload;
+
+ ret = drm_connector_register_all(drm);
+ if (ret)
+ goto err_unregister;
+
+ return 0;
+
+err_unregister:
+ drm_dev_unregister(drm);
+
+err_unload:
+ arcpgu_unload(drm);
+
+err_unref:
+ drm_dev_unref(drm);
+
+ return ret;
+}
+
+static int arcpgu_remove(struct platform_device *pdev)
+{
+ struct drm_device *drm = platform_get_drvdata(pdev);
+
+ drm_connector_unregister_all(drm);
+ drm_dev_unregister(drm);
+ arcpgu_unload(drm);
+ drm_dev_unref(drm);
+
+ return 0;
+}
+
+static const struct of_device_id arcpgu_of_table[] = {
+ {.compatible = "snps,arcpgu"},
+ {}
+};
+
+MODULE_DEVICE_TABLE(of, arcpgu_of_table);
+
+static struct platform_driver arcpgu_platform_driver = {
+ .probe = arcpgu_probe,
+ .remove = arcpgu_remove,
+ .driver = {
+ .name = "arcpgu",
+ .of_match_table = arcpgu_of_table,
+ },
+};
+
+module_platform_driver(arcpgu_platform_driver);
+
+MODULE_AUTHOR("Carlos Palminha <palminha@synopsys.com>");
+MODULE_DESCRIPTION("ARC PGU DRM driver");
+MODULE_LICENSE("GPL");