Orange Pi5 kernel

// SPDX-License-Identifier: GPL-2.0-only
/*
 * ARC PGU DRM driver.
 *
 * Copyright (C) 2016 Synopsys, Inc. (www.synopsys.com)
 */
 
#include <linux/clk.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_debugfs.h>
#include <drm/drm_device.h>
#include <drm/drm_drv.h>
#include <drm/drm_fb_cma_helper.h>
#include <drm/drm_fb_helper.h>
#include <drm/drm_gem_cma_helper.h>
#include <drm/drm_gem_framebuffer_helper.h>
#include <drm/drm_of.h>
#include <drm/drm_probe_helper.h>
#include <linux/dma-mapping.h>
#include <linux/module.h>
#include <linux/of_reserved_mem.h>
#include <linux/platform_device.h>
 
#include "arcpgu.h"
#include "arcpgu_regs.h"
 
static const struct drm_mode_config_funcs arcpgu_drm_modecfg_funcs = {
<------>.fb_create  = drm_gem_fb_create,
<------>.atomic_check = drm_atomic_helper_check,
<------>.atomic_commit = drm_atomic_helper_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;
}
 
DEFINE_DRM_GEM_CMA_FOPS(arcpgu_drm_ops);
 
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 = NULL, *endpoint_node = NULL;
<------>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);
 
<------>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))
<------><------>return PTR_ERR(arcpgu->regs);
 
<------>dev_info(drm->dev, "arc_pgu ID: 0x%x\n",
<------><------> arc_pgu_read(arcpgu, ARCPGU_REG_ID));
 
<------>/* Get the optional framebuffer memory resource */
<------>ret = of_reserved_mem_device_init(drm->dev);
<------>if (ret && ret != -ENODEV)
<------><------>return ret;
 
<------>if (dma_set_mask_and_coherent(drm->dev, DMA_BIT_MASK(32)))
<------><------>return -ENODEV;
 
<------>if (arc_pgu_setup_crtc(drm) < 0)
<------><------>return -ENODEV;
 
<------>/*
<------> * There is only one output port inside each device. It is linked with
<------> * encoder endpoint.
<------> */
<------>endpoint_node = of_graph_get_next_endpoint(pdev->dev.of_node, NULL);
<------>if (endpoint_node) {
<------><------>encoder_node = of_graph_get_remote_port_parent(endpoint_node);
<------><------>of_node_put(endpoint_node);
<------>}
 
<------>if (encoder_node) {
<------><------>ret = arcpgu_drm_hdmi_init(drm, encoder_node);
<------><------>of_node_put(encoder_node);
<------><------>if (ret < 0)
<------><------><------>return ret;
<------>} else {
<------><------>dev_info(drm->dev, "no encoder found. Assumed virtual LCD on simulation platform\n");
<------><------>ret = arcpgu_drm_sim_init(drm, NULL);
<------><------>if (ret < 0)
<------><------><------>return ret;
<------>}
 
<------>drm_mode_config_reset(drm);
<------>drm_kms_helper_poll_init(drm);
 
<------>platform_set_drvdata(pdev, drm);
<------>return 0;
}
 
static int arcpgu_unload(struct drm_device *drm)
{
<------>drm_kms_helper_poll_fini(drm);
<------>drm_atomic_helper_shutdown(drm);
<------>drm_mode_config_cleanup(drm);
 
<------>return 0;
}
 
#ifdef CONFIG_DEBUG_FS
static int arcpgu_show_pxlclock(struct seq_file *m, void *arg)
{
<------>struct drm_info_node *node = (struct drm_info_node *)m->private;
<------>struct drm_device *drm = node->minor->dev;
<------>struct arcpgu_drm_private *arcpgu = drm->dev_private;
<------>unsigned long clkrate = clk_get_rate(arcpgu->clk);
<------>unsigned long mode_clock = arcpgu->crtc.mode.crtc_clock * 1000;
 
<------>seq_printf(m, "hw  : %lu\n", clkrate);
<------>seq_printf(m, "mode: %lu\n", mode_clock);
<------>return 0;
}
 
static struct drm_info_list arcpgu_debugfs_list[] = {
<------>{ "clocks", arcpgu_show_pxlclock, 0 },
};
 
static void arcpgu_debugfs_init(struct drm_minor *minor)
{
<------>drm_debugfs_create_files(arcpgu_debugfs_list,
<------><------><------><------> ARRAY_SIZE(arcpgu_debugfs_list),
<------><------><------><------> minor->debugfs_root, minor);
}
#endif
 
static struct drm_driver arcpgu_drm_driver = {
<------>.driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_ATOMIC,
<------>.name = "arcpgu",
<------>.desc = "ARC PGU Controller",
<------>.date = "20160219",
<------>.major = 1,
<------>.minor = 0,
<------>.patchlevel = 0,
<------>.fops = &arcpgu_drm_ops,
<------>DRM_GEM_CMA_DRIVER_OPS,
#ifdef CONFIG_DEBUG_FS
<------>.debugfs_init = arcpgu_debugfs_init,
#endif
};
 
static int arcpgu_probe(struct platform_device *pdev)
{
<------>struct drm_device *drm;
<------>int ret;
 
<------>drm = drm_dev_alloc(&arcpgu_drm_driver, &pdev->dev);
<------>if (IS_ERR(drm))
<------><------>return PTR_ERR(drm);
 
<------>ret = arcpgu_load(drm);
<------>if (ret)
<------><------>goto err_unref;
 
<------>ret = drm_dev_register(drm, 0);
<------>if (ret)
<------><------>goto err_unload;
 
<------>drm_fbdev_generic_setup(drm, 16);
 
<------>return 0;
 
err_unload:
<------>arcpgu_unload(drm);
 
err_unref:
<------>drm_dev_put(drm);
 
<------>return ret;
}
 
static int arcpgu_remove(struct platform_device *pdev)
{
<------>struct drm_device *drm = platform_get_drvdata(pdev);
 
<------>drm_dev_unregister(drm);
<------>arcpgu_unload(drm);
<------>drm_dev_put(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");