14f2a8f58SJoel Stanley // SPDX-License-Identifier: GPL-2.0+ 24f2a8f58SJoel Stanley // Copyright 2018 IBM Corporation 34f2a8f58SJoel Stanley 44f2a8f58SJoel Stanley #include <linux/clk.h> 54f2a8f58SJoel Stanley #include <linux/dma-mapping.h> 64f2a8f58SJoel Stanley #include <linux/irq.h> 74f2a8f58SJoel Stanley #include <linux/mfd/syscon.h> 84f2a8f58SJoel Stanley #include <linux/module.h> 94f2a8f58SJoel Stanley #include <linux/of.h> 10bce724faSJoel Stanley #include <linux/of_device.h> 114f2a8f58SJoel Stanley #include <linux/of_reserved_mem.h> 124f2a8f58SJoel Stanley #include <linux/platform_device.h> 134f2a8f58SJoel Stanley #include <linux/regmap.h> 144f2a8f58SJoel Stanley #include <linux/reset.h> 154f2a8f58SJoel Stanley 164f2a8f58SJoel Stanley #include <drm/drm_atomic_helper.h> 174f2a8f58SJoel Stanley #include <drm/drm_crtc_helper.h> 184f2a8f58SJoel Stanley #include <drm/drm_device.h> 194f2a8f58SJoel Stanley #include <drm/drm_fb_cma_helper.h> 204f2a8f58SJoel Stanley #include <drm/drm_fb_helper.h> 214f2a8f58SJoel Stanley #include <drm/drm_gem_cma_helper.h> 224f2a8f58SJoel Stanley #include <drm/drm_gem_framebuffer_helper.h> 23*94afe983SJavier Martinez Canillas #include <drm/drm_module.h> 244f2a8f58SJoel Stanley #include <drm/drm_probe_helper.h> 254f2a8f58SJoel Stanley #include <drm/drm_simple_kms_helper.h> 264f2a8f58SJoel Stanley #include <drm/drm_vblank.h> 274f2a8f58SJoel Stanley #include <drm/drm_drv.h> 284f2a8f58SJoel Stanley 294f2a8f58SJoel Stanley #include "aspeed_gfx.h" 304f2a8f58SJoel Stanley 314f2a8f58SJoel Stanley /** 324f2a8f58SJoel Stanley * DOC: ASPEED GFX Driver 334f2a8f58SJoel Stanley * 344f2a8f58SJoel Stanley * This driver is for the ASPEED BMC SoC's 'GFX' display hardware, also called 354f2a8f58SJoel Stanley * the 'SOC Display Controller' in the datasheet. This driver runs on the ARM 364f2a8f58SJoel Stanley * based BMC systems, unlike the ast driver which runs on a host CPU and is for 374f2a8f58SJoel Stanley * a PCIe graphics device. 384f2a8f58SJoel Stanley * 394f2a8f58SJoel Stanley * The AST2500 supports a total of 3 output paths: 404f2a8f58SJoel Stanley * 414f2a8f58SJoel Stanley * 1. VGA output, the output target can choose either or both to the DAC 424f2a8f58SJoel Stanley * or DVO interface. 434f2a8f58SJoel Stanley * 444f2a8f58SJoel Stanley * 2. Graphics CRT output, the output target can choose either or both to 454f2a8f58SJoel Stanley * the DAC or DVO interface. 464f2a8f58SJoel Stanley * 474f2a8f58SJoel Stanley * 3. Video input from DVO, the video input can be used for video engine 484f2a8f58SJoel Stanley * capture or DAC display output. 494f2a8f58SJoel Stanley * 504f2a8f58SJoel Stanley * Output options are selected in SCU2C. 514f2a8f58SJoel Stanley * 524f2a8f58SJoel Stanley * The "VGA mode" device is the PCI attached controller. The "Graphics CRT" 534f2a8f58SJoel Stanley * is the ARM's internal display controller. 544f2a8f58SJoel Stanley * 554f2a8f58SJoel Stanley * The driver only supports a simple configuration consisting of a 40MHz 564f2a8f58SJoel Stanley * pixel clock, fixed by hardware limitations, and the VGA output path. 574f2a8f58SJoel Stanley * 584f2a8f58SJoel Stanley * The driver was written with the 'AST2500 Software Programming Guide' v17, 594f2a8f58SJoel Stanley * which is available under NDA from ASPEED. 604f2a8f58SJoel Stanley */ 614f2a8f58SJoel Stanley 62bce724faSJoel Stanley struct aspeed_gfx_config { 63bce724faSJoel Stanley u32 dac_reg; /* DAC register in SCU */ 64bce724faSJoel Stanley u32 vga_scratch_reg; /* VGA scratch register in SCU */ 65bce724faSJoel Stanley u32 throd_val; /* Default Threshold Seting */ 66bce724faSJoel Stanley u32 scan_line_max; /* Max memory size of one scan line */ 67bce724faSJoel Stanley }; 68bce724faSJoel Stanley 69bce724faSJoel Stanley static const struct aspeed_gfx_config ast2400_config = { 70bce724faSJoel Stanley .dac_reg = 0x2c, 71bce724faSJoel Stanley .vga_scratch_reg = 0x50, 72bce724faSJoel Stanley .throd_val = CRT_THROD_LOW(0x1e) | CRT_THROD_HIGH(0x12), 73bce724faSJoel Stanley .scan_line_max = 64, 74bce724faSJoel Stanley }; 75bce724faSJoel Stanley 76bce724faSJoel Stanley static const struct aspeed_gfx_config ast2500_config = { 77bce724faSJoel Stanley .dac_reg = 0x2c, 78bce724faSJoel Stanley .vga_scratch_reg = 0x50, 79bce724faSJoel Stanley .throd_val = CRT_THROD_LOW(0x24) | CRT_THROD_HIGH(0x3c), 80bce724faSJoel Stanley .scan_line_max = 128, 81bce724faSJoel Stanley }; 82bce724faSJoel Stanley 83bce724faSJoel Stanley static const struct of_device_id aspeed_gfx_match[] = { 84bce724faSJoel Stanley { .compatible = "aspeed,ast2400-gfx", .data = &ast2400_config }, 85bce724faSJoel Stanley { .compatible = "aspeed,ast2500-gfx", .data = &ast2500_config }, 86bce724faSJoel Stanley { }, 87bce724faSJoel Stanley }; 88bce724faSJoel Stanley MODULE_DEVICE_TABLE(of, aspeed_gfx_match); 89bce724faSJoel Stanley 904f2a8f58SJoel Stanley static const struct drm_mode_config_funcs aspeed_gfx_mode_config_funcs = { 914f2a8f58SJoel Stanley .fb_create = drm_gem_fb_create, 924f2a8f58SJoel Stanley .atomic_check = drm_atomic_helper_check, 934f2a8f58SJoel Stanley .atomic_commit = drm_atomic_helper_commit, 944f2a8f58SJoel Stanley }; 954f2a8f58SJoel Stanley 96c2c25c1cSDaniel Vetter static int aspeed_gfx_setup_mode_config(struct drm_device *drm) 974f2a8f58SJoel Stanley { 98c2c25c1cSDaniel Vetter int ret; 99c2c25c1cSDaniel Vetter 100c2c25c1cSDaniel Vetter ret = drmm_mode_config_init(drm); 101c2c25c1cSDaniel Vetter if (ret) 102c2c25c1cSDaniel Vetter return ret; 1034f2a8f58SJoel Stanley 1044f2a8f58SJoel Stanley drm->mode_config.min_width = 0; 1054f2a8f58SJoel Stanley drm->mode_config.min_height = 0; 1064f2a8f58SJoel Stanley drm->mode_config.max_width = 800; 1074f2a8f58SJoel Stanley drm->mode_config.max_height = 600; 1084f2a8f58SJoel Stanley drm->mode_config.funcs = &aspeed_gfx_mode_config_funcs; 109c2c25c1cSDaniel Vetter 110c2c25c1cSDaniel Vetter return ret; 1114f2a8f58SJoel Stanley } 1124f2a8f58SJoel Stanley 1134f2a8f58SJoel Stanley static irqreturn_t aspeed_gfx_irq_handler(int irq, void *data) 1144f2a8f58SJoel Stanley { 1154f2a8f58SJoel Stanley struct drm_device *drm = data; 116cd829454SDaniel Vetter struct aspeed_gfx *priv = to_aspeed_gfx(drm); 1174f2a8f58SJoel Stanley u32 reg; 1184f2a8f58SJoel Stanley 1194f2a8f58SJoel Stanley reg = readl(priv->base + CRT_CTRL1); 1204f2a8f58SJoel Stanley 1214f2a8f58SJoel Stanley if (reg & CRT_CTRL_VERTICAL_INTR_STS) { 1224f2a8f58SJoel Stanley drm_crtc_handle_vblank(&priv->pipe.crtc); 1234f2a8f58SJoel Stanley writel(reg, priv->base + CRT_CTRL1); 1244f2a8f58SJoel Stanley return IRQ_HANDLED; 1254f2a8f58SJoel Stanley } 1264f2a8f58SJoel Stanley 1274f2a8f58SJoel Stanley return IRQ_NONE; 1284f2a8f58SJoel Stanley } 1294f2a8f58SJoel Stanley 1304f2a8f58SJoel Stanley static int aspeed_gfx_load(struct drm_device *drm) 1314f2a8f58SJoel Stanley { 1324f2a8f58SJoel Stanley struct platform_device *pdev = to_platform_device(drm->dev); 133cd829454SDaniel Vetter struct aspeed_gfx *priv = to_aspeed_gfx(drm); 13492614ad5SJoel Stanley struct device_node *np = pdev->dev.of_node; 135bce724faSJoel Stanley const struct aspeed_gfx_config *config; 136bce724faSJoel Stanley const struct of_device_id *match; 1374f2a8f58SJoel Stanley struct resource *res; 1384f2a8f58SJoel Stanley int ret; 1394f2a8f58SJoel Stanley 1404f2a8f58SJoel Stanley res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 1414f2a8f58SJoel Stanley priv->base = devm_ioremap_resource(drm->dev, res); 1424f2a8f58SJoel Stanley if (IS_ERR(priv->base)) 1434f2a8f58SJoel Stanley return PTR_ERR(priv->base); 1444f2a8f58SJoel Stanley 145bce724faSJoel Stanley match = of_match_device(aspeed_gfx_match, &pdev->dev); 146bce724faSJoel Stanley if (!match) 147bce724faSJoel Stanley return -EINVAL; 148bce724faSJoel Stanley config = match->data; 149bce724faSJoel Stanley 150bce724faSJoel Stanley priv->dac_reg = config->dac_reg; 151bce724faSJoel Stanley priv->vga_scratch_reg = config->vga_scratch_reg; 152bce724faSJoel Stanley priv->throd_val = config->throd_val; 153bce724faSJoel Stanley priv->scan_line_max = config->scan_line_max; 154bce724faSJoel Stanley 15592614ad5SJoel Stanley priv->scu = syscon_regmap_lookup_by_phandle(np, "syscon"); 15692614ad5SJoel Stanley if (IS_ERR(priv->scu)) { 1574f2a8f58SJoel Stanley priv->scu = syscon_regmap_lookup_by_compatible("aspeed,ast2500-scu"); 1584f2a8f58SJoel Stanley if (IS_ERR(priv->scu)) { 1594f2a8f58SJoel Stanley dev_err(&pdev->dev, "failed to find SCU regmap\n"); 1604f2a8f58SJoel Stanley return PTR_ERR(priv->scu); 1614f2a8f58SJoel Stanley } 16292614ad5SJoel Stanley } 1634f2a8f58SJoel Stanley 1644f2a8f58SJoel Stanley ret = of_reserved_mem_device_init(drm->dev); 1654f2a8f58SJoel Stanley if (ret) { 1664f2a8f58SJoel Stanley dev_err(&pdev->dev, 1674f2a8f58SJoel Stanley "failed to initialize reserved mem: %d\n", ret); 1684f2a8f58SJoel Stanley return ret; 1694f2a8f58SJoel Stanley } 1704f2a8f58SJoel Stanley 1714f2a8f58SJoel Stanley ret = dma_set_mask_and_coherent(drm->dev, DMA_BIT_MASK(32)); 1724f2a8f58SJoel Stanley if (ret) { 1734f2a8f58SJoel Stanley dev_err(&pdev->dev, "failed to set DMA mask: %d\n", ret); 1744f2a8f58SJoel Stanley return ret; 1754f2a8f58SJoel Stanley } 1764f2a8f58SJoel Stanley 1774f2a8f58SJoel Stanley priv->rst = devm_reset_control_get_exclusive(&pdev->dev, NULL); 1784f2a8f58SJoel Stanley if (IS_ERR(priv->rst)) { 1794f2a8f58SJoel Stanley dev_err(&pdev->dev, 1804f2a8f58SJoel Stanley "missing or invalid reset controller device tree entry"); 1814f2a8f58SJoel Stanley return PTR_ERR(priv->rst); 1824f2a8f58SJoel Stanley } 1834f2a8f58SJoel Stanley reset_control_deassert(priv->rst); 1844f2a8f58SJoel Stanley 1854f2a8f58SJoel Stanley priv->clk = devm_clk_get(drm->dev, NULL); 1864f2a8f58SJoel Stanley if (IS_ERR(priv->clk)) { 1874f2a8f58SJoel Stanley dev_err(&pdev->dev, 1884f2a8f58SJoel Stanley "missing or invalid clk device tree entry"); 1894f2a8f58SJoel Stanley return PTR_ERR(priv->clk); 1904f2a8f58SJoel Stanley } 1914f2a8f58SJoel Stanley clk_prepare_enable(priv->clk); 1924f2a8f58SJoel Stanley 1934f2a8f58SJoel Stanley /* Sanitize control registers */ 1944f2a8f58SJoel Stanley writel(0, priv->base + CRT_CTRL1); 1954f2a8f58SJoel Stanley writel(0, priv->base + CRT_CTRL2); 1964f2a8f58SJoel Stanley 197c2c25c1cSDaniel Vetter ret = aspeed_gfx_setup_mode_config(drm); 198c2c25c1cSDaniel Vetter if (ret < 0) 199c2c25c1cSDaniel Vetter return ret; 2004f2a8f58SJoel Stanley 2014f2a8f58SJoel Stanley ret = drm_vblank_init(drm, 1); 2024f2a8f58SJoel Stanley if (ret < 0) { 2034f2a8f58SJoel Stanley dev_err(drm->dev, "Failed to initialise vblank\n"); 2044f2a8f58SJoel Stanley return ret; 2054f2a8f58SJoel Stanley } 2064f2a8f58SJoel Stanley 2074f2a8f58SJoel Stanley ret = aspeed_gfx_create_output(drm); 2084f2a8f58SJoel Stanley if (ret < 0) { 2094f2a8f58SJoel Stanley dev_err(drm->dev, "Failed to create outputs\n"); 2104f2a8f58SJoel Stanley return ret; 2114f2a8f58SJoel Stanley } 2124f2a8f58SJoel Stanley 2134f2a8f58SJoel Stanley ret = aspeed_gfx_create_pipe(drm); 2144f2a8f58SJoel Stanley if (ret < 0) { 2154f2a8f58SJoel Stanley dev_err(drm->dev, "Cannot setup simple display pipe\n"); 2164f2a8f58SJoel Stanley return ret; 2174f2a8f58SJoel Stanley } 2184f2a8f58SJoel Stanley 2194f2a8f58SJoel Stanley ret = devm_request_irq(drm->dev, platform_get_irq(pdev, 0), 2204f2a8f58SJoel Stanley aspeed_gfx_irq_handler, 0, "aspeed gfx", drm); 2214f2a8f58SJoel Stanley if (ret < 0) { 2224f2a8f58SJoel Stanley dev_err(drm->dev, "Failed to install IRQ handler\n"); 2234f2a8f58SJoel Stanley return ret; 2244f2a8f58SJoel Stanley } 2254f2a8f58SJoel Stanley 2264f2a8f58SJoel Stanley drm_mode_config_reset(drm); 2274f2a8f58SJoel Stanley 2284f2a8f58SJoel Stanley return 0; 2294f2a8f58SJoel Stanley } 2304f2a8f58SJoel Stanley 2314f2a8f58SJoel Stanley static void aspeed_gfx_unload(struct drm_device *drm) 2324f2a8f58SJoel Stanley { 2334f2a8f58SJoel Stanley drm_kms_helper_poll_fini(drm); 2344f2a8f58SJoel Stanley } 2354f2a8f58SJoel Stanley 2364f2a8f58SJoel Stanley DEFINE_DRM_GEM_CMA_FOPS(fops); 2374f2a8f58SJoel Stanley 23870a59dd8SDaniel Vetter static const struct drm_driver aspeed_gfx_driver = { 2390424fdafSDaniel Vetter .driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC, 240178c7235SThomas Zimmermann DRM_GEM_CMA_DRIVER_OPS, 2414f2a8f58SJoel Stanley .fops = &fops, 2424f2a8f58SJoel Stanley .name = "aspeed-gfx-drm", 2434f2a8f58SJoel Stanley .desc = "ASPEED GFX DRM", 2444f2a8f58SJoel Stanley .date = "20180319", 2454f2a8f58SJoel Stanley .major = 1, 2464f2a8f58SJoel Stanley .minor = 0, 2474f2a8f58SJoel Stanley }; 2484f2a8f58SJoel Stanley 249696029ebSJoel Stanley static ssize_t dac_mux_store(struct device *dev, struct device_attribute *attr, 250696029ebSJoel Stanley const char *buf, size_t count) 251696029ebSJoel Stanley { 252696029ebSJoel Stanley struct aspeed_gfx *priv = dev_get_drvdata(dev); 253696029ebSJoel Stanley u32 val; 254696029ebSJoel Stanley int rc; 255696029ebSJoel Stanley 256696029ebSJoel Stanley rc = kstrtou32(buf, 0, &val); 257696029ebSJoel Stanley if (rc) 258696029ebSJoel Stanley return rc; 259696029ebSJoel Stanley 260696029ebSJoel Stanley if (val > 3) 261696029ebSJoel Stanley return -EINVAL; 262696029ebSJoel Stanley 263bce724faSJoel Stanley rc = regmap_update_bits(priv->scu, priv->dac_reg, 0x30000, val << 16); 264696029ebSJoel Stanley if (rc < 0) 265696029ebSJoel Stanley return 0; 266696029ebSJoel Stanley 267696029ebSJoel Stanley return count; 268696029ebSJoel Stanley } 269696029ebSJoel Stanley 270696029ebSJoel Stanley static ssize_t dac_mux_show(struct device *dev, struct device_attribute *attr, char *buf) 271696029ebSJoel Stanley { 272696029ebSJoel Stanley struct aspeed_gfx *priv = dev_get_drvdata(dev); 273696029ebSJoel Stanley u32 reg; 274696029ebSJoel Stanley int rc; 275696029ebSJoel Stanley 276bce724faSJoel Stanley rc = regmap_read(priv->scu, priv->dac_reg, ®); 277696029ebSJoel Stanley if (rc) 278696029ebSJoel Stanley return rc; 279696029ebSJoel Stanley 280696029ebSJoel Stanley return sprintf(buf, "%u\n", (reg >> 16) & 0x3); 281696029ebSJoel Stanley } 282696029ebSJoel Stanley static DEVICE_ATTR_RW(dac_mux); 283696029ebSJoel Stanley 284696029ebSJoel Stanley static ssize_t 285696029ebSJoel Stanley vga_pw_show(struct device *dev, struct device_attribute *attr, char *buf) 286696029ebSJoel Stanley { 287696029ebSJoel Stanley struct aspeed_gfx *priv = dev_get_drvdata(dev); 288696029ebSJoel Stanley u32 reg; 289696029ebSJoel Stanley int rc; 290696029ebSJoel Stanley 291bce724faSJoel Stanley rc = regmap_read(priv->scu, priv->vga_scratch_reg, ®); 292696029ebSJoel Stanley if (rc) 293696029ebSJoel Stanley return rc; 294696029ebSJoel Stanley 295b4a6aaeaSJoel Stanley return sprintf(buf, "%u\n", reg); 296696029ebSJoel Stanley } 297696029ebSJoel Stanley static DEVICE_ATTR_RO(vga_pw); 298696029ebSJoel Stanley 299696029ebSJoel Stanley static struct attribute *aspeed_sysfs_entries[] = { 300696029ebSJoel Stanley &dev_attr_vga_pw.attr, 301696029ebSJoel Stanley &dev_attr_dac_mux.attr, 302696029ebSJoel Stanley NULL, 303696029ebSJoel Stanley }; 304696029ebSJoel Stanley 305696029ebSJoel Stanley static struct attribute_group aspeed_sysfs_attr_group = { 306696029ebSJoel Stanley .attrs = aspeed_sysfs_entries, 307696029ebSJoel Stanley }; 308696029ebSJoel Stanley 3094f2a8f58SJoel Stanley static int aspeed_gfx_probe(struct platform_device *pdev) 3104f2a8f58SJoel Stanley { 311cd829454SDaniel Vetter struct aspeed_gfx *priv; 3124f2a8f58SJoel Stanley int ret; 3134f2a8f58SJoel Stanley 314cd829454SDaniel Vetter priv = devm_drm_dev_alloc(&pdev->dev, &aspeed_gfx_driver, 315cd829454SDaniel Vetter struct aspeed_gfx, drm); 316cd829454SDaniel Vetter if (IS_ERR(priv)) 317cd829454SDaniel Vetter return PTR_ERR(priv); 3184f2a8f58SJoel Stanley 319cd829454SDaniel Vetter ret = aspeed_gfx_load(&priv->drm); 3204f2a8f58SJoel Stanley if (ret) 321cd829454SDaniel Vetter return ret; 3224f2a8f58SJoel Stanley 3235dd331d4SJulia Lawall platform_set_drvdata(pdev, priv); 324696029ebSJoel Stanley 325696029ebSJoel Stanley ret = sysfs_create_group(&pdev->dev.kobj, &aspeed_sysfs_attr_group); 326696029ebSJoel Stanley if (ret) 327696029ebSJoel Stanley return ret; 328696029ebSJoel Stanley 329cd829454SDaniel Vetter ret = drm_dev_register(&priv->drm, 0); 3304f2a8f58SJoel Stanley if (ret) 3314f2a8f58SJoel Stanley goto err_unload; 3324f2a8f58SJoel Stanley 33322493574SGuenter Roeck drm_fbdev_generic_setup(&priv->drm, 32); 3344f2a8f58SJoel Stanley return 0; 3354f2a8f58SJoel Stanley 3364f2a8f58SJoel Stanley err_unload: 337696029ebSJoel Stanley sysfs_remove_group(&pdev->dev.kobj, &aspeed_sysfs_attr_group); 338cd829454SDaniel Vetter aspeed_gfx_unload(&priv->drm); 3394f2a8f58SJoel Stanley 3404f2a8f58SJoel Stanley return ret; 3414f2a8f58SJoel Stanley } 3424f2a8f58SJoel Stanley 3434f2a8f58SJoel Stanley static int aspeed_gfx_remove(struct platform_device *pdev) 3444f2a8f58SJoel Stanley { 3454f2a8f58SJoel Stanley struct drm_device *drm = platform_get_drvdata(pdev); 3464f2a8f58SJoel Stanley 347696029ebSJoel Stanley sysfs_remove_group(&pdev->dev.kobj, &aspeed_sysfs_attr_group); 3484f2a8f58SJoel Stanley drm_dev_unregister(drm); 3494f2a8f58SJoel Stanley aspeed_gfx_unload(drm); 3504f2a8f58SJoel Stanley 3514f2a8f58SJoel Stanley return 0; 3524f2a8f58SJoel Stanley } 3534f2a8f58SJoel Stanley 3544f2a8f58SJoel Stanley static struct platform_driver aspeed_gfx_platform_driver = { 3554f2a8f58SJoel Stanley .probe = aspeed_gfx_probe, 3564f2a8f58SJoel Stanley .remove = aspeed_gfx_remove, 3574f2a8f58SJoel Stanley .driver = { 3584f2a8f58SJoel Stanley .name = "aspeed_gfx", 3594f2a8f58SJoel Stanley .of_match_table = aspeed_gfx_match, 3604f2a8f58SJoel Stanley }, 3614f2a8f58SJoel Stanley }; 3624f2a8f58SJoel Stanley 363*94afe983SJavier Martinez Canillas drm_module_platform_driver(aspeed_gfx_platform_driver); 3644f2a8f58SJoel Stanley 3654f2a8f58SJoel Stanley MODULE_AUTHOR("Joel Stanley <joel@jms.id.au>"); 3664f2a8f58SJoel Stanley MODULE_DESCRIPTION("ASPEED BMC DRM/KMS driver"); 3674f2a8f58SJoel Stanley MODULE_LICENSE("GPL"); 368