Orange Pi5 kernel

// SPDX-License-Identifier: GPL-2.0+
// Copyright 2018 IBM Corporation
 
#include <linux/clk.h>
#include <linux/dma-mapping.h>
#include <linux/irq.h>
#include <linux/mfd/syscon.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_reserved_mem.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/reset.h>
 
#include <drm/drm_atomic_helper.h>
#include <drm/drm_crtc_helper.h>
#include <drm/drm_device.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_probe_helper.h>
#include <drm/drm_simple_kms_helper.h>
#include <drm/drm_vblank.h>
#include <drm/drm_drv.h>
 
#include "aspeed_gfx.h"
 
/**
 * DOC: ASPEED GFX Driver
 *
 * This driver is for the ASPEED BMC SoC's 'GFX' display hardware, also called
 * the 'SOC Display Controller' in the datasheet. This driver runs on the ARM
 * based BMC systems, unlike the ast driver which runs on a host CPU and is for
 * a PCIe graphics device.
 *
 * The AST2500 supports a total of 3 output paths:
 *
 *   1. VGA output, the output target can choose either or both to the DAC
 *   or DVO interface.
 *
 *   2. Graphics CRT output, the output target can choose either or both to
 *   the DAC or DVO interface.
 *
 *   3. Video input from DVO, the video input can be used for video engine
 *   capture or DAC display output.
 *
 * Output options are selected in SCU2C.
 *
 * The "VGA mode" device is the PCI attached controller. The "Graphics CRT"
 * is the ARM's internal display controller.
 *
 * The driver only supports a simple configuration consisting of a 40MHz
 * pixel clock, fixed by hardware limitations, and the VGA output path.
 *
 * The driver was written with the 'AST2500 Software Programming Guide' v17,
 * which is available under NDA from ASPEED.
 */
 
static const struct drm_mode_config_funcs aspeed_gfx_mode_config_funcs = {
<------>.fb_create		= drm_gem_fb_create,
<------>.atomic_check		= drm_atomic_helper_check,
<------>.atomic_commit		= drm_atomic_helper_commit,
};
 
static int aspeed_gfx_setup_mode_config(struct drm_device *drm)
{
<------>int ret;
 
<------>ret = drmm_mode_config_init(drm);
<------>if (ret)
<------><------>return ret;
 
<------>drm->mode_config.min_width = 0;
<------>drm->mode_config.min_height = 0;
<------>drm->mode_config.max_width = 800;
<------>drm->mode_config.max_height = 600;
<------>drm->mode_config.funcs = &aspeed_gfx_mode_config_funcs;
 
<------>return ret;
}
 
static irqreturn_t aspeed_gfx_irq_handler(int irq, void *data)
{
<------>struct drm_device *drm = data;
<------>struct aspeed_gfx *priv = to_aspeed_gfx(drm);
<------>u32 reg;
 
<------>reg = readl(priv->base + CRT_CTRL1);
 
<------>if (reg & CRT_CTRL_VERTICAL_INTR_STS) {
<------><------>drm_crtc_handle_vblank(&priv->pipe.crtc);
<------><------>writel(reg, priv->base + CRT_CTRL1);
<------><------>return IRQ_HANDLED;
<------>}
 
<------>return IRQ_NONE;
}
 
 
 
static int aspeed_gfx_load(struct drm_device *drm)
{
<------>struct platform_device *pdev = to_platform_device(drm->dev);
<------>struct aspeed_gfx *priv = to_aspeed_gfx(drm);
<------>struct resource *res;
<------>int ret;
 
<------>res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
<------>priv->base = devm_ioremap_resource(drm->dev, res);
<------>if (IS_ERR(priv->base))
<------><------>return PTR_ERR(priv->base);
 
<------>priv->scu = syscon_regmap_lookup_by_compatible("aspeed,ast2500-scu");
<------>if (IS_ERR(priv->scu)) {
<------><------>dev_err(&pdev->dev, "failed to find SCU regmap\n");
<------><------>return PTR_ERR(priv->scu);
<------>}
 
<------>ret = of_reserved_mem_device_init(drm->dev);
<------>if (ret) {
<------><------>dev_err(&pdev->dev,
<------><------><------>"failed to initialize reserved mem: %d\n", ret);
<------><------>return ret;
<------>}
 
<------>ret = dma_set_mask_and_coherent(drm->dev, DMA_BIT_MASK(32));
<------>if (ret) {
<------><------>dev_err(&pdev->dev, "failed to set DMA mask: %d\n", ret);
<------><------>return ret;
<------>}
 
<------>priv->rst = devm_reset_control_get_exclusive(&pdev->dev, NULL);
<------>if (IS_ERR(priv->rst)) {
<------><------>dev_err(&pdev->dev,
<------><------><------>"missing or invalid reset controller device tree entry");
<------><------>return PTR_ERR(priv->rst);
<------>}
<------>reset_control_deassert(priv->rst);
 
<------>priv->clk = devm_clk_get(drm->dev, NULL);
<------>if (IS_ERR(priv->clk)) {
<------><------>dev_err(&pdev->dev,
<------><------><------>"missing or invalid clk device tree entry");
<------><------>return PTR_ERR(priv->clk);
<------>}
<------>clk_prepare_enable(priv->clk);
 
<------>/* Sanitize control registers */
<------>writel(0, priv->base + CRT_CTRL1);
<------>writel(0, priv->base + CRT_CTRL2);
 
<------>ret = aspeed_gfx_setup_mode_config(drm);
<------>if (ret < 0)
<------><------>return ret;
 
<------>ret = drm_vblank_init(drm, 1);
<------>if (ret < 0) {
<------><------>dev_err(drm->dev, "Failed to initialise vblank\n");
<------><------>return ret;
<------>}
 
<------>ret = aspeed_gfx_create_output(drm);
<------>if (ret < 0) {
<------><------>dev_err(drm->dev, "Failed to create outputs\n");
<------><------>return ret;
<------>}
 
<------>ret = aspeed_gfx_create_pipe(drm);
<------>if (ret < 0) {
<------><------>dev_err(drm->dev, "Cannot setup simple display pipe\n");
<------><------>return ret;
<------>}
 
<------>ret = devm_request_irq(drm->dev, platform_get_irq(pdev, 0),
<------><------><------>       aspeed_gfx_irq_handler, 0, "aspeed gfx", drm);
<------>if (ret < 0) {
<------><------>dev_err(drm->dev, "Failed to install IRQ handler\n");
<------><------>return ret;
<------>}
 
<------>drm_mode_config_reset(drm);
 
<------>return 0;
}
 
static void aspeed_gfx_unload(struct drm_device *drm)
{
<------>drm_kms_helper_poll_fini(drm);
}
 
DEFINE_DRM_GEM_CMA_FOPS(fops);
 
static struct drm_driver aspeed_gfx_driver = {
<------>.driver_features        = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC,
<------>.gem_create_object	= drm_gem_cma_create_object_default_funcs,
<------>.dumb_create		= drm_gem_cma_dumb_create,
<------>.prime_handle_to_fd	= drm_gem_prime_handle_to_fd,
<------>.prime_fd_to_handle	= drm_gem_prime_fd_to_handle,
<------>.gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
<------>.gem_prime_mmap		= drm_gem_prime_mmap,
<------>.fops = &fops,
<------>.name = "aspeed-gfx-drm",
<------>.desc = "ASPEED GFX DRM",
<------>.date = "20180319",
<------>.major = 1,
<------>.minor = 0,
};
 
static const struct of_device_id aspeed_gfx_match[] = {
<------>{ .compatible = "aspeed,ast2500-gfx" },
<------>{ }
};
 
static int aspeed_gfx_probe(struct platform_device *pdev)
{
<------>struct aspeed_gfx *priv;
<------>int ret;
 
<------>priv = devm_drm_dev_alloc(&pdev->dev, &aspeed_gfx_driver,
<------><------><------><------>  struct aspeed_gfx, drm);
<------>if (IS_ERR(priv))
<------><------>return PTR_ERR(priv);
 
<------>ret = aspeed_gfx_load(&priv->drm);
<------>if (ret)
<------><------>return ret;
 
<------>ret = drm_dev_register(&priv->drm, 0);
<------>if (ret)
<------><------>goto err_unload;
 
<------>drm_fbdev_generic_setup(&priv->drm, 32);
<------>return 0;
 
err_unload:
<------>aspeed_gfx_unload(&priv->drm);
 
<------>return ret;
}
 
static int aspeed_gfx_remove(struct platform_device *pdev)
{
<------>struct drm_device *drm = platform_get_drvdata(pdev);
 
<------>drm_dev_unregister(drm);
<------>aspeed_gfx_unload(drm);
 
<------>return 0;
}
 
static struct platform_driver aspeed_gfx_platform_driver = {
<------>.probe		= aspeed_gfx_probe,
<------>.remove		= aspeed_gfx_remove,
<------>.driver = {
<------><------>.name = "aspeed_gfx",
<------><------>.of_match_table = aspeed_gfx_match,
<------>},
};
 
module_platform_driver(aspeed_gfx_platform_driver);
 
MODULE_AUTHOR("Joel Stanley <joel@jms.id.au>");
MODULE_DESCRIPTION("ASPEED BMC DRM/KMS driver");
MODULE_LICENSE("GPL");