252 lines
6.1 KiB
C
252 lines
6.1 KiB
C
/*
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* ARC PGU DRM driver.
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*
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* Copyright (C) 2016 Synopsys, Inc. (www.synopsys.com)
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#include <linux/clk.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 <drm/drm_atomic_helper.h>
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#include <linux/of_reserved_mem.h>
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#include "arcpgu.h"
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#include "arcpgu_regs.h"
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static void arcpgu_fb_output_poll_changed(struct drm_device *dev)
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{
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struct arcpgu_drm_private *arcpgu = dev->dev_private;
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drm_fbdev_cma_hotplug_event(arcpgu->fbdev);
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}
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static struct drm_mode_config_funcs arcpgu_drm_modecfg_funcs = {
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.fb_create = drm_fb_cma_create,
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.output_poll_changed = arcpgu_fb_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 arcpgu_setup_mode_config(struct drm_device *drm)
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{
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drm_mode_config_init(drm);
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drm->mode_config.min_width = 0;
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drm->mode_config.min_height = 0;
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drm->mode_config.max_width = 1920;
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drm->mode_config.max_height = 1080;
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drm->mode_config.funcs = &arcpgu_drm_modecfg_funcs;
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}
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static int arcpgu_gem_mmap(struct file *filp, struct vm_area_struct *vma)
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{
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int ret;
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ret = drm_gem_mmap(filp, vma);
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if (ret)
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return ret;
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vma->vm_page_prot = pgprot_noncached(vm_get_page_prot(vma->vm_flags));
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return 0;
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}
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static const struct file_operations arcpgu_drm_ops = {
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.owner = THIS_MODULE,
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.open = drm_open,
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.release = drm_release,
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.unlocked_ioctl = drm_ioctl,
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.compat_ioctl = drm_compat_ioctl,
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.poll = drm_poll,
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.read = drm_read,
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.llseek = no_llseek,
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.mmap = arcpgu_gem_mmap,
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};
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static void arcpgu_lastclose(struct drm_device *drm)
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{
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struct arcpgu_drm_private *arcpgu = drm->dev_private;
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drm_fbdev_cma_restore_mode(arcpgu->fbdev);
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}
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static int arcpgu_load(struct drm_device *drm)
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{
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struct platform_device *pdev = to_platform_device(drm->dev);
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struct arcpgu_drm_private *arcpgu;
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struct device_node *encoder_node;
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struct resource *res;
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int ret;
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arcpgu = devm_kzalloc(&pdev->dev, sizeof(*arcpgu), GFP_KERNEL);
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if (arcpgu == NULL)
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return -ENOMEM;
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drm->dev_private = arcpgu;
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arcpgu->clk = devm_clk_get(drm->dev, "pxlclk");
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if (IS_ERR(arcpgu->clk))
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return PTR_ERR(arcpgu->clk);
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arcpgu_setup_mode_config(drm);
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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arcpgu->regs = devm_ioremap_resource(&pdev->dev, res);
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if (IS_ERR(arcpgu->regs))
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return PTR_ERR(arcpgu->regs);
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dev_info(drm->dev, "arc_pgu ID: 0x%x\n",
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arc_pgu_read(arcpgu, ARCPGU_REG_ID));
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/* Get the optional framebuffer memory resource */
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ret = of_reserved_mem_device_init(drm->dev);
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if (ret && ret != -ENODEV)
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return ret;
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if (dma_set_mask_and_coherent(drm->dev, DMA_BIT_MASK(32)))
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return -ENODEV;
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if (arc_pgu_setup_crtc(drm) < 0)
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return -ENODEV;
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/* find the encoder node and initialize it */
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encoder_node = of_parse_phandle(drm->dev->of_node, "encoder-slave", 0);
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if (encoder_node) {
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ret = arcpgu_drm_hdmi_init(drm, encoder_node);
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of_node_put(encoder_node);
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if (ret < 0)
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return ret;
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} else {
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ret = arcpgu_drm_sim_init(drm, NULL);
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if (ret < 0)
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return ret;
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}
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drm_mode_config_reset(drm);
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drm_kms_helper_poll_init(drm);
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arcpgu->fbdev = drm_fbdev_cma_init(drm, 16,
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drm->mode_config.num_connector);
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if (IS_ERR(arcpgu->fbdev)) {
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ret = PTR_ERR(arcpgu->fbdev);
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arcpgu->fbdev = NULL;
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return -ENODEV;
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}
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platform_set_drvdata(pdev, arcpgu);
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return 0;
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}
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static int arcpgu_unload(struct drm_device *drm)
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{
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struct arcpgu_drm_private *arcpgu = drm->dev_private;
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if (arcpgu->fbdev) {
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drm_fbdev_cma_fini(arcpgu->fbdev);
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arcpgu->fbdev = NULL;
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}
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drm_kms_helper_poll_fini(drm);
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drm_vblank_cleanup(drm);
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drm_mode_config_cleanup(drm);
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return 0;
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}
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static struct drm_driver arcpgu_drm_driver = {
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.driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_PRIME |
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DRIVER_ATOMIC,
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.lastclose = arcpgu_lastclose,
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.name = "drm-arcpgu",
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.desc = "ARC PGU Controller",
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.date = "20160219",
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.major = 1,
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.minor = 0,
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.patchlevel = 0,
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.fops = &arcpgu_drm_ops,
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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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.get_vblank_counter = drm_vblank_no_hw_counter,
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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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};
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static int arcpgu_probe(struct platform_device *pdev)
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{
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struct drm_device *drm;
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int ret;
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drm = drm_dev_alloc(&arcpgu_drm_driver, &pdev->dev);
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if (IS_ERR(drm))
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return PTR_ERR(drm);
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ret = arcpgu_load(drm);
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if (ret)
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goto err_unref;
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ret = drm_dev_register(drm, 0);
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if (ret)
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goto err_unload;
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return 0;
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err_unload:
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arcpgu_unload(drm);
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err_unref:
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drm_dev_unref(drm);
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return ret;
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}
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static int arcpgu_remove(struct platform_device *pdev)
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{
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struct drm_device *drm = platform_get_drvdata(pdev);
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drm_dev_unregister(drm);
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arcpgu_unload(drm);
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drm_dev_unref(drm);
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return 0;
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}
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static const struct of_device_id arcpgu_of_table[] = {
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{.compatible = "snps,arcpgu"},
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{}
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};
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MODULE_DEVICE_TABLE(of, arcpgu_of_table);
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static struct platform_driver arcpgu_platform_driver = {
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.probe = arcpgu_probe,
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.remove = arcpgu_remove,
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.driver = {
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.name = "arcpgu",
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.of_match_table = arcpgu_of_table,
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},
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};
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module_platform_driver(arcpgu_platform_driver);
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MODULE_AUTHOR("Carlos Palminha <palminha@synopsys.com>");
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MODULE_DESCRIPTION("ARC PGU DRM driver");
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MODULE_LICENSE("GPL");
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