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1// SPDX-License-Identifier: GPL-2.02/*3 * Copyright (C) 2018 Linus Walleij <linus.walleij@linaro.org>4 * Parts of this file were based on the MCDE driver by Marcus Lorentzon5 * (C) ST-Ericsson SA 20136 */7 8/**9 * DOC: ST-Ericsson MCDE Driver10 *11 * The MCDE (short for multi-channel display engine) is a graphics12 * controller found in the Ux500 chipsets, such as NovaThor U8500.13 * It was initially conceptualized by ST Microelectronics for the14 * successor of the Nomadik line, STn8500 but productified in the15 * ST-Ericsson U8500 where is was used for mass-market deployments16 * in Android phones from Samsung and Sony Ericsson.17 *18 * It can do 1080p30 on SDTV CCIR656, DPI-2, DBI-2 or DSI for19 * panels with or without frame buffering and can convert most20 * input formats including most variants of RGB and YUV.21 *22 * The hardware has four display pipes, and the layout is a little23 * bit like this::24 *25 *   Memory     -> Overlay -> Channel -> FIFO -> 8 formatters -> DSI/DPI26 *   External      0..5       0..3       A,B,    6 x DSI         bridge27 *   source 0..9                         C0,C1   2 x DPI28 *29 * FIFOs A and B are for LCD and HDMI while FIFO CO/C1 are for30 * panels with embedded buffer.31 * 6 of the formatters are for DSI, 3 pairs for VID/CMD respectively.32 * 2 of the formatters are for DPI.33 *34 * Behind the formatters are the DSI or DPI ports that route to35 * the external pins of the chip. As there are 3 DSI ports and one36 * DPI port, it is possible to configure up to 4 display pipelines37 * (effectively using channels 0..3) for concurrent use.38 *39 * In the current DRM/KMS setup, we use one external source, one overlay,40 * one FIFO and one formatter which we connect to the simple DMA framebuffer41 * helpers. We then provide a bridge to the DSI port, and on the DSI port42 * bridge we connect hang a panel bridge or other bridge. This may be subject43 * to change as we exploit more of the hardware capabilities.44 *45 * TODO:46 *47 * - Enabled damaged rectangles using drm_plane_enable_fb_damage_clips()48 *   so we can selectively just transmit the damaged area to a49 *   command-only display.50 * - Enable mixing of more planes, possibly at the cost of moving away51 *   from using the simple framebuffer pipeline.52 * - Enable output to bridges such as the AV8100 HDMI encoder from53 *   the DSI bridge.54 */55 56#include <linux/clk.h>57#include <linux/component.h>58#include <linux/dma-buf.h>59#include <linux/irq.h>60#include <linux/io.h>61#include <linux/module.h>62#include <linux/of_platform.h>63#include <linux/platform_device.h>64#include <linux/regulator/consumer.h>65#include <linux/slab.h>66#include <linux/delay.h>67 68#include <drm/drm_atomic_helper.h>69#include <drm/drm_bridge.h>70#include <drm/drm_drv.h>71#include <drm/drm_fb_dma_helper.h>72#include <drm/drm_fbdev_dma.h>73#include <drm/drm_gem.h>74#include <drm/drm_gem_dma_helper.h>75#include <drm/drm_gem_framebuffer_helper.h>76#include <drm/drm_managed.h>77#include <drm/drm_of.h>78#include <drm/drm_probe_helper.h>79#include <drm/drm_panel.h>80#include <drm/drm_vblank.h>81 82#include "mcde_drm.h"83 84#define DRIVER_DESC	"DRM module for MCDE"85 86#define MCDE_PID 0x000001FC87#define MCDE_PID_METALFIX_VERSION_SHIFT 088#define MCDE_PID_METALFIX_VERSION_MASK 0x000000FF89#define MCDE_PID_DEVELOPMENT_VERSION_SHIFT 890#define MCDE_PID_DEVELOPMENT_VERSION_MASK 0x0000FF0091#define MCDE_PID_MINOR_VERSION_SHIFT 1692#define MCDE_PID_MINOR_VERSION_MASK 0x00FF000093#define MCDE_PID_MAJOR_VERSION_SHIFT 2494#define MCDE_PID_MAJOR_VERSION_MASK 0xFF00000095 96static const struct drm_mode_config_funcs mcde_mode_config_funcs = {97	.fb_create = drm_gem_fb_create,98	.atomic_check = drm_atomic_helper_check,99	.atomic_commit = drm_atomic_helper_commit,100};101 102static const struct drm_mode_config_helper_funcs mcde_mode_config_helpers = {103	/*104	 * Using this function is necessary to commit atomic updates105	 * that need the CRTC to be enabled before a commit, as is106	 * the case with e.g. DSI displays.107	 */108	.atomic_commit_tail = drm_atomic_helper_commit_tail_rpm,109};110 111static irqreturn_t mcde_irq(int irq, void *data)112{113	struct mcde *mcde = data;114	u32 val;115 116	val = readl(mcde->regs + MCDE_MISERR);117 118	mcde_display_irq(mcde);119 120	if (val)121		dev_info(mcde->dev, "some error IRQ\n");122	writel(val, mcde->regs + MCDE_RISERR);123 124	return IRQ_HANDLED;125}126 127static int mcde_modeset_init(struct drm_device *drm)128{129	struct drm_mode_config *mode_config;130	struct mcde *mcde = to_mcde(drm);131	int ret;132 133	/*134	 * If no other bridge was found, check if we have a DPI panel or135	 * any other bridge connected directly to the MCDE DPI output.136	 * If a DSI bridge is found, DSI will take precedence.137	 *138	 * TODO: more elaborate bridge selection if we have more than one139	 * thing attached to the system.140	 */141	if (!mcde->bridge) {142		struct drm_panel *panel;143		struct drm_bridge *bridge;144 145		ret = drm_of_find_panel_or_bridge(drm->dev->of_node,146						  0, 0, &panel, &bridge);147		if (ret) {148			dev_err(drm->dev,149				"Could not locate any output bridge or panel\n");150			return ret;151		}152		if (panel) {153			bridge = drm_panel_bridge_add_typed(panel,154					DRM_MODE_CONNECTOR_DPI);155			if (IS_ERR(bridge)) {156				dev_err(drm->dev,157					"Could not connect panel bridge\n");158				return PTR_ERR(bridge);159			}160		}161		mcde->dpi_output = true;162		mcde->bridge = bridge;163		mcde->flow_mode = MCDE_DPI_FORMATTER_FLOW;164	}165 166	mode_config = &drm->mode_config;167	mode_config->funcs = &mcde_mode_config_funcs;168	mode_config->helper_private = &mcde_mode_config_helpers;169	/* This hardware can do 1080p */170	mode_config->min_width = 1;171	mode_config->max_width = 1920;172	mode_config->min_height = 1;173	mode_config->max_height = 1080;174 175	ret = drm_vblank_init(drm, 1);176	if (ret) {177		dev_err(drm->dev, "failed to init vblank\n");178		return ret;179	}180 181	ret = mcde_display_init(drm);182	if (ret) {183		dev_err(drm->dev, "failed to init display\n");184		return ret;185	}186 187	/* Attach the bridge. */188	ret = drm_simple_display_pipe_attach_bridge(&mcde->pipe,189						    mcde->bridge);190	if (ret) {191		dev_err(drm->dev, "failed to attach display output bridge\n");192		return ret;193	}194 195	drm_mode_config_reset(drm);196	drm_kms_helper_poll_init(drm);197 198	return 0;199}200 201DEFINE_DRM_GEM_DMA_FOPS(drm_fops);202 203static const struct drm_driver mcde_drm_driver = {204	.driver_features =205		DRIVER_MODESET | DRIVER_GEM | DRIVER_ATOMIC,206	.ioctls = NULL,207	.fops = &drm_fops,208	.name = "mcde",209	.desc = DRIVER_DESC,210	.date = "20180529",211	.major = 1,212	.minor = 0,213	.patchlevel = 0,214	DRM_GEM_DMA_DRIVER_OPS,215};216 217static int mcde_drm_bind(struct device *dev)218{219	struct drm_device *drm = dev_get_drvdata(dev);220	int ret;221 222	ret = drmm_mode_config_init(drm);223	if (ret)224		return ret;225 226	ret = component_bind_all(drm->dev, drm);227	if (ret) {228		dev_err(dev, "can't bind component devices\n");229		return ret;230	}231 232	ret = mcde_modeset_init(drm);233	if (ret)234		goto unbind;235 236	ret = drm_dev_register(drm, 0);237	if (ret < 0)238		goto unbind;239 240	drm_fbdev_dma_setup(drm, 32);241 242	return 0;243 244unbind:245	component_unbind_all(drm->dev, drm);246	return ret;247}248 249static void mcde_drm_unbind(struct device *dev)250{251	struct drm_device *drm = dev_get_drvdata(dev);252 253	drm_dev_unregister(drm);254	drm_atomic_helper_shutdown(drm);255	component_unbind_all(drm->dev, drm);256}257 258static const struct component_master_ops mcde_drm_comp_ops = {259	.bind = mcde_drm_bind,260	.unbind = mcde_drm_unbind,261};262 263static struct platform_driver *const mcde_component_drivers[] = {264	&mcde_dsi_driver,265};266 267static int mcde_probe(struct platform_device *pdev)268{269	struct device *dev = &pdev->dev;270	struct drm_device *drm;271	struct mcde *mcde;272	struct component_match *match = NULL;273	u32 pid;274	int irq;275	int ret;276	int i;277 278	mcde = devm_drm_dev_alloc(dev, &mcde_drm_driver, struct mcde, drm);279	if (IS_ERR(mcde))280		return PTR_ERR(mcde);281	drm = &mcde->drm;282	mcde->dev = dev;283	platform_set_drvdata(pdev, drm);284 285	/* First obtain and turn on the main power */286	mcde->epod = devm_regulator_get(dev, "epod");287	if (IS_ERR(mcde->epod)) {288		ret = PTR_ERR(mcde->epod);289		dev_err(dev, "can't get EPOD regulator\n");290		return ret;291	}292	ret = regulator_enable(mcde->epod);293	if (ret) {294		dev_err(dev, "can't enable EPOD regulator\n");295		return ret;296	}297	mcde->vana = devm_regulator_get(dev, "vana");298	if (IS_ERR(mcde->vana)) {299		ret = PTR_ERR(mcde->vana);300		dev_err(dev, "can't get VANA regulator\n");301		goto regulator_epod_off;302	}303	ret = regulator_enable(mcde->vana);304	if (ret) {305		dev_err(dev, "can't enable VANA regulator\n");306		goto regulator_epod_off;307	}308	/*309	 * The vendor code uses ESRAM (onchip RAM) and need to activate310	 * the v-esram34 regulator, but we don't use that yet311	 */312 313	/* Clock the silicon so we can access the registers */314	mcde->mcde_clk = devm_clk_get(dev, "mcde");315	if (IS_ERR(mcde->mcde_clk)) {316		dev_err(dev, "unable to get MCDE main clock\n");317		ret = PTR_ERR(mcde->mcde_clk);318		goto regulator_off;319	}320	ret = clk_prepare_enable(mcde->mcde_clk);321	if (ret) {322		dev_err(dev, "failed to enable MCDE main clock\n");323		goto regulator_off;324	}325	dev_info(dev, "MCDE clk rate %lu Hz\n", clk_get_rate(mcde->mcde_clk));326 327	mcde->lcd_clk = devm_clk_get(dev, "lcd");328	if (IS_ERR(mcde->lcd_clk)) {329		dev_err(dev, "unable to get LCD clock\n");330		ret = PTR_ERR(mcde->lcd_clk);331		goto clk_disable;332	}333	mcde->hdmi_clk = devm_clk_get(dev, "hdmi");334	if (IS_ERR(mcde->hdmi_clk)) {335		dev_err(dev, "unable to get HDMI clock\n");336		ret = PTR_ERR(mcde->hdmi_clk);337		goto clk_disable;338	}339 340	mcde->regs = devm_platform_ioremap_resource(pdev, 0);341	if (IS_ERR(mcde->regs)) {342		dev_err(dev, "no MCDE regs\n");343		ret = -EINVAL;344		goto clk_disable;345	}346 347	irq = platform_get_irq(pdev, 0);348	if (irq < 0) {349		ret = irq;350		goto clk_disable;351	}352 353	ret = devm_request_irq(dev, irq, mcde_irq, 0, "mcde", mcde);354	if (ret) {355		dev_err(dev, "failed to request irq %d\n", ret);356		goto clk_disable;357	}358 359	/*360	 * Check hardware revision, we only support U8500v2 version361	 * as this was the only version used for mass market deployment,362	 * but surely you can add more versions if you have them and363	 * need them.364	 */365	pid = readl(mcde->regs + MCDE_PID);366	dev_info(dev, "found MCDE HW revision %d.%d (dev %d, metal fix %d)\n",367		 (pid & MCDE_PID_MAJOR_VERSION_MASK)368		 >> MCDE_PID_MAJOR_VERSION_SHIFT,369		 (pid & MCDE_PID_MINOR_VERSION_MASK)370		 >> MCDE_PID_MINOR_VERSION_SHIFT,371		 (pid & MCDE_PID_DEVELOPMENT_VERSION_MASK)372		 >> MCDE_PID_DEVELOPMENT_VERSION_SHIFT,373		 (pid & MCDE_PID_METALFIX_VERSION_MASK)374		 >> MCDE_PID_METALFIX_VERSION_SHIFT);375	if (pid != 0x03000800) {376		dev_err(dev, "unsupported hardware revision\n");377		ret = -ENODEV;378		goto clk_disable;379	}380 381	/* Disable and clear any pending interrupts */382	mcde_display_disable_irqs(mcde);383	writel(0, mcde->regs + MCDE_IMSCERR);384	writel(0xFFFFFFFF, mcde->regs + MCDE_RISERR);385 386	/* Spawn child devices for the DSI ports */387	devm_of_platform_populate(dev);388 389	/* Create something that will match the subdrivers when we bind */390	for (i = 0; i < ARRAY_SIZE(mcde_component_drivers); i++) {391		struct device_driver *drv = &mcde_component_drivers[i]->driver;392		struct device *p = NULL, *d;393 394		while ((d = platform_find_device_by_driver(p, drv))) {395			put_device(p);396			component_match_add(dev, &match, component_compare_dev, d);397			p = d;398		}399		put_device(p);400	}401	if (!match) {402		dev_err(dev, "no matching components\n");403		ret = -ENODEV;404		goto clk_disable;405	}406	if (IS_ERR(match)) {407		dev_err(dev, "could not create component match\n");408		ret = PTR_ERR(match);409		goto clk_disable;410	}411 412	/*413	 * Perform an invasive reset of the MCDE and all blocks by414	 * cutting the power to the subsystem, then bring it back up415	 * later when we enable the display as a result of416	 * component_master_add_with_match().417	 */418	ret = regulator_disable(mcde->epod);419	if (ret) {420		dev_err(dev, "can't disable EPOD regulator\n");421		return ret;422	}423	/* Wait 50 ms so we are sure we cut the power */424	usleep_range(50000, 70000);425 426	ret = component_master_add_with_match(&pdev->dev, &mcde_drm_comp_ops,427					      match);428	if (ret) {429		dev_err(dev, "failed to add component master\n");430		/*431		 * The EPOD regulator is already disabled at this point so some432		 * special errorpath code is needed433		 */434		clk_disable_unprepare(mcde->mcde_clk);435		regulator_disable(mcde->vana);436		return ret;437	}438 439	return 0;440 441clk_disable:442	clk_disable_unprepare(mcde->mcde_clk);443regulator_off:444	regulator_disable(mcde->vana);445regulator_epod_off:446	regulator_disable(mcde->epod);447	return ret;448 449}450 451static void mcde_remove(struct platform_device *pdev)452{453	struct drm_device *drm = platform_get_drvdata(pdev);454	struct mcde *mcde = to_mcde(drm);455 456	component_master_del(&pdev->dev, &mcde_drm_comp_ops);457	clk_disable_unprepare(mcde->mcde_clk);458	regulator_disable(mcde->vana);459	regulator_disable(mcde->epod);460}461 462static void mcde_shutdown(struct platform_device *pdev)463{464	struct drm_device *drm = platform_get_drvdata(pdev);465 466	if (drm->registered)467		drm_atomic_helper_shutdown(drm);468}469 470static const struct of_device_id mcde_of_match[] = {471	{472		.compatible = "ste,mcde",473	},474	{},475};476 477static struct platform_driver mcde_driver = {478	.driver = {479		.name           = "mcde",480		.of_match_table = mcde_of_match,481	},482	.probe = mcde_probe,483	.remove_new = mcde_remove,484	.shutdown = mcde_shutdown,485};486 487static struct platform_driver *const component_drivers[] = {488	&mcde_dsi_driver,489};490 491static int __init mcde_drm_register(void)492{493	int ret;494 495	if (drm_firmware_drivers_only())496		return -ENODEV;497 498	ret = platform_register_drivers(component_drivers,499					ARRAY_SIZE(component_drivers));500	if (ret)501		return ret;502 503	return platform_driver_register(&mcde_driver);504}505 506static void __exit mcde_drm_unregister(void)507{508	platform_unregister_drivers(component_drivers,509				    ARRAY_SIZE(component_drivers));510	platform_driver_unregister(&mcde_driver);511}512 513module_init(mcde_drm_register);514module_exit(mcde_drm_unregister);515 516MODULE_ALIAS("platform:mcde-drm");517MODULE_DESCRIPTION(DRIVER_DESC);518MODULE_AUTHOR("Linus Walleij <linus.walleij@linaro.org>");519MODULE_LICENSE("GPL");520