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