1 // SPDX-License-Identifier: GPL-2.0+
5 #include <linux/dma-mapping.h>
37  * The AST2500 supports a total of 3 output paths:
56  * The driver was written with the 'AST2500 Software Programming Guide' v17,
74 	drm->mode_config.min_width = 0;  in aspeed_gfx_setup_mode_config()
75 	drm->mode_config.min_height = 0;  in aspeed_gfx_setup_mode_config()
76 	drm->mode_config.max_width = 800;  in aspeed_gfx_setup_mode_config()
77 	drm->mode_config.max_height = 600;  in aspeed_gfx_setup_mode_config()
78 	drm->mode_config.funcs = &aspeed_gfx_mode_config_funcs;  in aspeed_gfx_setup_mode_config()
89 	reg = readl(priv->base + CRT_CTRL1);  in aspeed_gfx_irq_handler()
92 		drm_crtc_handle_vblank(&priv->pipe.crtc);  in aspeed_gfx_irq_handler()
93 		writel(reg, priv->base + CRT_CTRL1);  in aspeed_gfx_irq_handler()
104 	struct platform_device *pdev = to_platform_device(drm->dev);  in aspeed_gfx_load()
110 	priv->base = devm_ioremap_resource(drm->dev, res);  in aspeed_gfx_load()
111 	if (IS_ERR(priv->base))  in aspeed_gfx_load()
112 		return PTR_ERR(priv->base);  in aspeed_gfx_load()
114 	priv->scu = syscon_regmap_lookup_by_compatible("aspeed,ast2500-scu");  in aspeed_gfx_load()
115 	if (IS_ERR(priv->scu)) {  in aspeed_gfx_load()
116 		dev_err(&pdev->dev, "failed to find SCU regmap\n");  in aspeed_gfx_load()
117 		return PTR_ERR(priv->scu);  in aspeed_gfx_load()
120 	ret = of_reserved_mem_device_init(drm->dev);  in aspeed_gfx_load()
122 		dev_err(&pdev->dev,  in aspeed_gfx_load()
127 	ret = dma_set_mask_and_coherent(drm->dev, DMA_BIT_MASK(32));  in aspeed_gfx_load()
129 		dev_err(&pdev->dev, "failed to set DMA mask: %d\n", ret);  in aspeed_gfx_load()
133 	priv->rst = devm_reset_control_get_exclusive(&pdev->dev, NULL);  in aspeed_gfx_load()
134 	if (IS_ERR(priv->rst)) {  in aspeed_gfx_load()
135 		dev_err(&pdev->dev,  in aspeed_gfx_load()
137 		return PTR_ERR(priv->rst);  in aspeed_gfx_load()
139 	reset_control_deassert(priv->rst);  in aspeed_gfx_load()
141 	priv->clk = devm_clk_get(drm->dev, NULL);  in aspeed_gfx_load()
142 	if (IS_ERR(priv->clk)) {  in aspeed_gfx_load()
143 		dev_err(&pdev->dev,  in aspeed_gfx_load()
145 		return PTR_ERR(priv->clk);  in aspeed_gfx_load()
147 	clk_prepare_enable(priv->clk);  in aspeed_gfx_load()
150 	writel(0, priv->base + CRT_CTRL1);  in aspeed_gfx_load()
151 	writel(0, priv->base + CRT_CTRL2);  in aspeed_gfx_load()
159 		dev_err(drm->dev, "Failed to initialise vblank\n");  in aspeed_gfx_load()
165 		dev_err(drm->dev, "Failed to create outputs\n");  in aspeed_gfx_load()
171 		dev_err(drm->dev, "Cannot setup simple display pipe\n");  in aspeed_gfx_load()
175 	ret = devm_request_irq(drm->dev, platform_get_irq(pdev, 0),  in aspeed_gfx_load()
178 		dev_err(drm->dev, "Failed to install IRQ handler\n");  in aspeed_gfx_load()
203 	.name = "aspeed-gfx-drm",
211 	{ .compatible = "aspeed,ast2500-gfx" },
220 	priv = devm_drm_dev_alloc(&pdev->dev, &aspeed_gfx_driver,  in aspeed_gfx_probe()
225 	ret = aspeed_gfx_load(&priv->drm);  in aspeed_gfx_probe()
229 	ret = drm_dev_register(&priv->drm, 0);  in aspeed_gfx_probe()
233 	drm_fbdev_generic_setup(&priv->drm, 32);  in aspeed_gfx_probe()
237 	aspeed_gfx_unload(&priv->drm);  in aspeed_gfx_probe()