1 // SPDX-License-Identifier: GPL-2.0
4 * Parts of this file were based on the MCDE driver by Marcus Lorentzon
5 * (C) ST-Ericsson SA 2013
9 * DOC: ST-Ericsson MCDE Driver
11 * The MCDE (short for multi-channel display engine) is a graphics
12 * controller found in the Ux500 chipsets, such as NovaThor U8500.
13 * It was initially conceptualized by ST Microelectronics for the
14 * successor of the Nomadik line, STn8500 but productified in the
15 * ST-Ericsson U8500 where is was used for mass-market deployments
16 * in Android phones from Samsung and Sony Ericsson.
18 * It can do 1080p30 on SDTV CCIR656, DPI-2, DBI-2 or DSI for
19 * panels with or without frame buffering and can convert most
20 * input formats including most variants of RGB and YUV.
22 * The hardware has four display pipes, and the layout is a little
25 * Memory -> Overlay -> Channel -> FIFO -> 5 formatters -> DSI/DPI
26 * External 0..5 0..3 A,B, 3 x DSI bridge
27 * source 0..9 C0,C1 2 x DPI
29 * FIFOs A and B are for LCD and HDMI while FIFO CO/C1 are for
30 * panels with embedded buffer.
31 * 3 of the formatters are for DSI.
32 * 2 of the formatters are for DPI.
34 * Behind the formatters are the DSI or DPI ports that route to
35 * the external pins of the chip. As there are 3 DSI ports and one
36 * DPI port, it is possible to configure up to 4 display pipelines
37 * (effectively using channels 0..3) for concurrent use.
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 CMA framebuffer
41 * helpers. We then provide a bridge to the DSI port, and on the DSI port
42 * bridge we connect hang a panel bridge or other bridge. This may be subject
43 * to change as we exploit more of the hardware capabilities.
46 * - Enabled damaged rectangles using drm_plane_enable_fb_damage_clips()
47 * so we can selectively just transmit the damaged area to a
48 * command-only display.
49 * - Enable mixing of more planes, possibly at the cost of moving away
50 * from using the simple framebuffer pipeline.
51 * - Enable output to bridges such as the AV8100 HDMI encoder from
55 #include <linux/clk.h>
56 #include <linux/component.h>
57 #include <linux/dma-buf.h>
58 #include <linux/irq.h>
60 #include <linux/module.h>
61 #include <linux/of_platform.h>
62 #include <linux/platform_device.h>
63 #include <linux/regulator/consumer.h>
64 #include <linux/slab.h>
66 #include <drm/drm_atomic_helper.h>
67 #include <drm/drm_bridge.h>
68 #include <drm/drm_drv.h>
69 #include <drm/drm_fb_cma_helper.h>
70 #include <drm/drm_fb_helper.h>
71 #include <drm/drm_gem.h>
72 #include <drm/drm_gem_cma_helper.h>
73 #include <drm/drm_gem_framebuffer_helper.h>
74 #include <drm/drm_of.h>
75 #include <drm/drm_probe_helper.h>
76 #include <drm/drm_panel.h>
77 #include <drm/drm_vblank.h>
81 #define DRIVER_DESC "DRM module for MCDE"
83 #define MCDE_CR 0x00000000
84 #define MCDE_CR_IFIFOEMPTYLINECOUNT_V422_SHIFT 0
85 #define MCDE_CR_IFIFOEMPTYLINECOUNT_V422_MASK 0x0000003F
86 #define MCDE_CR_IFIFOCTRLEN BIT(15)
87 #define MCDE_CR_UFRECOVERY_MODE_V422 BIT(16)
88 #define MCDE_CR_WRAP_MODE_V422_SHIFT BIT(17)
89 #define MCDE_CR_AUTOCLKG_EN BIT(30)
90 #define MCDE_CR_MCDEEN BIT(31)
92 #define MCDE_CONF0 0x00000004
93 #define MCDE_CONF0_SYNCMUX0 BIT(0)
94 #define MCDE_CONF0_SYNCMUX1 BIT(1)
95 #define MCDE_CONF0_SYNCMUX2 BIT(2)
96 #define MCDE_CONF0_SYNCMUX3 BIT(3)
97 #define MCDE_CONF0_SYNCMUX4 BIT(4)
98 #define MCDE_CONF0_SYNCMUX5 BIT(5)
99 #define MCDE_CONF0_SYNCMUX6 BIT(6)
100 #define MCDE_CONF0_SYNCMUX7 BIT(7)
101 #define MCDE_CONF0_IFIFOCTRLWTRMRKLVL_SHIFT 12
102 #define MCDE_CONF0_IFIFOCTRLWTRMRKLVL_MASK 0x00007000
103 #define MCDE_CONF0_OUTMUX0_SHIFT 16
104 #define MCDE_CONF0_OUTMUX0_MASK 0x00070000
105 #define MCDE_CONF0_OUTMUX1_SHIFT 19
106 #define MCDE_CONF0_OUTMUX1_MASK 0x00380000
107 #define MCDE_CONF0_OUTMUX2_SHIFT 22
108 #define MCDE_CONF0_OUTMUX2_MASK 0x01C00000
109 #define MCDE_CONF0_OUTMUX3_SHIFT 25
110 #define MCDE_CONF0_OUTMUX3_MASK 0x0E000000
111 #define MCDE_CONF0_OUTMUX4_SHIFT 28
112 #define MCDE_CONF0_OUTMUX4_MASK 0x70000000
114 #define MCDE_SSP 0x00000008
115 #define MCDE_AIS 0x00000100
116 #define MCDE_IMSCERR 0x00000110
117 #define MCDE_RISERR 0x00000120
118 #define MCDE_MISERR 0x00000130
119 #define MCDE_SISERR 0x00000140
121 #define MCDE_PID 0x000001FC
122 #define MCDE_PID_METALFIX_VERSION_SHIFT 0
123 #define MCDE_PID_METALFIX_VERSION_MASK 0x000000FF
124 #define MCDE_PID_DEVELOPMENT_VERSION_SHIFT 8
125 #define MCDE_PID_DEVELOPMENT_VERSION_MASK 0x0000FF00
126 #define MCDE_PID_MINOR_VERSION_SHIFT 16
127 #define MCDE_PID_MINOR_VERSION_MASK 0x00FF0000
128 #define MCDE_PID_MAJOR_VERSION_SHIFT 24
129 #define MCDE_PID_MAJOR_VERSION_MASK 0xFF000000
131 static const struct drm_mode_config_funcs mcde_mode_config_funcs = {
132 .fb_create = drm_gem_fb_create_with_dirty,
133 .atomic_check = drm_atomic_helper_check,
134 .atomic_commit = drm_atomic_helper_commit,
137 static const struct drm_mode_config_helper_funcs mcde_mode_config_helpers = {
139 * Using this function is necessary to commit atomic updates
140 * that need the CRTC to be enabled before a commit, as is
141 * the case with e.g. DSI displays.
143 .atomic_commit_tail = drm_atomic_helper_commit_tail_rpm,
146 static irqreturn_t mcde_irq(int irq, void *data)
148 struct mcde *mcde = data;
151 val = readl(mcde->regs + MCDE_MISERR);
153 mcde_display_irq(mcde);
156 dev_info(mcde->dev, "some error IRQ\n");
157 writel(val, mcde->regs + MCDE_RISERR);
162 static int mcde_modeset_init(struct drm_device *drm)
164 struct drm_mode_config *mode_config;
165 struct mcde *mcde = drm->dev_private;
169 dev_err(drm->dev, "no display output bridge yet\n");
170 return -EPROBE_DEFER;
173 mode_config = &drm->mode_config;
174 mode_config->funcs = &mcde_mode_config_funcs;
175 mode_config->helper_private = &mcde_mode_config_helpers;
176 /* This hardware can do 1080p */
177 mode_config->min_width = 1;
178 mode_config->max_width = 1920;
179 mode_config->min_height = 1;
180 mode_config->max_height = 1080;
183 * Currently we only support vblank handling on the DSI bridge, using
184 * TE synchronization. If TE sync is not set up, it is still possible
185 * to push out a single update on demand, but this is hard for DRM to
189 ret = drm_vblank_init(drm, 1);
191 dev_err(drm->dev, "failed to init vblank\n");
196 ret = mcde_display_init(drm);
198 dev_err(drm->dev, "failed to init display\n");
203 * Attach the DSI bridge
205 * TODO: when adding support for the DPI bridge or several DSI bridges,
206 * we selectively connect the bridge(s) here instead of this simple
209 ret = drm_simple_display_pipe_attach_bridge(&mcde->pipe,
212 dev_err(drm->dev, "failed to attach display output bridge\n");
216 drm_mode_config_reset(drm);
217 drm_kms_helper_poll_init(drm);
218 drm_fbdev_generic_setup(drm, 32);
223 drm_mode_config_cleanup(drm);
227 static void mcde_release(struct drm_device *drm)
229 struct mcde *mcde = drm->dev_private;
231 drm_mode_config_cleanup(drm);
236 DEFINE_DRM_GEM_CMA_FOPS(drm_fops);
238 static struct drm_driver mcde_drm_driver = {
240 DRIVER_MODESET | DRIVER_GEM | DRIVER_ATOMIC,
241 .release = mcde_release,
242 .lastclose = drm_fb_helper_lastclose,
251 .dumb_create = drm_gem_cma_dumb_create,
252 .gem_free_object_unlocked = drm_gem_cma_free_object,
253 .gem_vm_ops = &drm_gem_cma_vm_ops,
255 .prime_handle_to_fd = drm_gem_prime_handle_to_fd,
256 .prime_fd_to_handle = drm_gem_prime_fd_to_handle,
257 .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
258 .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
259 .gem_prime_vmap = drm_gem_cma_prime_vmap,
260 .gem_prime_vunmap = drm_gem_cma_prime_vunmap,
261 .gem_prime_mmap = drm_gem_cma_prime_mmap,
264 static int mcde_drm_bind(struct device *dev)
266 struct drm_device *drm = dev_get_drvdata(dev);
269 drm_mode_config_init(drm);
271 ret = component_bind_all(drm->dev, drm);
273 dev_err(dev, "can't bind component devices\n");
277 ret = mcde_modeset_init(drm);
281 ret = drm_dev_register(drm, 0);
288 component_unbind_all(drm->dev, drm);
292 static void mcde_drm_unbind(struct device *dev)
294 struct drm_device *drm = dev_get_drvdata(dev);
296 drm_dev_unregister(drm);
297 drm_atomic_helper_shutdown(drm);
298 component_unbind_all(drm->dev, drm);
301 static const struct component_master_ops mcde_drm_comp_ops = {
302 .bind = mcde_drm_bind,
303 .unbind = mcde_drm_unbind,
306 static struct platform_driver *const mcde_component_drivers[] = {
310 static int mcde_compare_dev(struct device *dev, void *data)
315 static int mcde_probe(struct platform_device *pdev)
317 struct device *dev = &pdev->dev;
318 struct drm_device *drm;
320 struct component_match *match = NULL;
321 struct resource *res;
328 mcde = kzalloc(sizeof(*mcde), GFP_KERNEL);
333 ret = drm_dev_init(&mcde->drm, &mcde_drm_driver, dev);
339 drm->dev_private = mcde;
340 platform_set_drvdata(pdev, drm);
342 /* Enable use of the TE signal and interrupt */
343 mcde->te_sync = true;
344 /* Enable continuous updates: this is what Linux' framebuffer expects */
345 mcde->oneshot_mode = false;
346 drm->dev_private = mcde;
348 /* First obtain and turn on the main power */
349 mcde->epod = devm_regulator_get(dev, "epod");
350 if (IS_ERR(mcde->epod)) {
351 ret = PTR_ERR(mcde->epod);
352 dev_err(dev, "can't get EPOD regulator\n");
355 ret = regulator_enable(mcde->epod);
357 dev_err(dev, "can't enable EPOD regulator\n");
360 mcde->vana = devm_regulator_get(dev, "vana");
361 if (IS_ERR(mcde->vana)) {
362 ret = PTR_ERR(mcde->vana);
363 dev_err(dev, "can't get VANA regulator\n");
364 goto regulator_epod_off;
366 ret = regulator_enable(mcde->vana);
368 dev_err(dev, "can't enable VANA regulator\n");
369 goto regulator_epod_off;
372 * The vendor code uses ESRAM (onchip RAM) and need to activate
373 * the v-esram34 regulator, but we don't use that yet
376 /* Clock the silicon so we can access the registers */
377 mcde->mcde_clk = devm_clk_get(dev, "mcde");
378 if (IS_ERR(mcde->mcde_clk)) {
379 dev_err(dev, "unable to get MCDE main clock\n");
380 ret = PTR_ERR(mcde->mcde_clk);
383 ret = clk_prepare_enable(mcde->mcde_clk);
385 dev_err(dev, "failed to enable MCDE main clock\n");
388 dev_info(dev, "MCDE clk rate %lu Hz\n", clk_get_rate(mcde->mcde_clk));
390 mcde->lcd_clk = devm_clk_get(dev, "lcd");
391 if (IS_ERR(mcde->lcd_clk)) {
392 dev_err(dev, "unable to get LCD clock\n");
393 ret = PTR_ERR(mcde->lcd_clk);
396 mcde->hdmi_clk = devm_clk_get(dev, "hdmi");
397 if (IS_ERR(mcde->hdmi_clk)) {
398 dev_err(dev, "unable to get HDMI clock\n");
399 ret = PTR_ERR(mcde->hdmi_clk);
403 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
404 mcde->regs = devm_ioremap_resource(dev, res);
405 if (IS_ERR(mcde->regs)) {
406 dev_err(dev, "no MCDE regs\n");
411 irq = platform_get_irq(pdev, 0);
417 ret = devm_request_irq(dev, irq, mcde_irq, 0, "mcde", mcde);
419 dev_err(dev, "failed to request irq %d\n", ret);
424 * Check hardware revision, we only support U8500v2 version
425 * as this was the only version used for mass market deployment,
426 * but surely you can add more versions if you have them and
429 pid = readl(mcde->regs + MCDE_PID);
430 dev_info(dev, "found MCDE HW revision %d.%d (dev %d, metal fix %d)\n",
431 (pid & MCDE_PID_MAJOR_VERSION_MASK)
432 >> MCDE_PID_MAJOR_VERSION_SHIFT,
433 (pid & MCDE_PID_MINOR_VERSION_MASK)
434 >> MCDE_PID_MINOR_VERSION_SHIFT,
435 (pid & MCDE_PID_DEVELOPMENT_VERSION_MASK)
436 >> MCDE_PID_DEVELOPMENT_VERSION_SHIFT,
437 (pid & MCDE_PID_METALFIX_VERSION_MASK)
438 >> MCDE_PID_METALFIX_VERSION_SHIFT);
439 if (pid != 0x03000800) {
440 dev_err(dev, "unsupported hardware revision\n");
445 /* Set up the main control, watermark level at 7 */
446 val = 7 << MCDE_CONF0_IFIFOCTRLWTRMRKLVL_SHIFT;
447 /* 24 bits DPI: connect LSB Ch B to D[0:7] */
448 val |= 3 << MCDE_CONF0_OUTMUX0_SHIFT;
449 /* TV out: connect LSB Ch B to D[8:15] */
450 val |= 3 << MCDE_CONF0_OUTMUX1_SHIFT;
451 /* Don't care about this muxing */
452 val |= 0 << MCDE_CONF0_OUTMUX2_SHIFT;
453 /* 24 bits DPI: connect MID Ch B to D[24:31] */
454 val |= 4 << MCDE_CONF0_OUTMUX3_SHIFT;
455 /* 5: 24 bits DPI: connect MSB Ch B to D[32:39] */
456 val |= 5 << MCDE_CONF0_OUTMUX4_SHIFT;
457 /* Syncmux bits zero: DPI channel A and B on output pins A and B resp */
458 writel(val, mcde->regs + MCDE_CONF0);
460 /* Enable automatic clock gating */
461 val = readl(mcde->regs + MCDE_CR);
462 val |= MCDE_CR_MCDEEN | MCDE_CR_AUTOCLKG_EN;
463 writel(val, mcde->regs + MCDE_CR);
465 /* Clear any pending interrupts */
466 mcde_display_disable_irqs(mcde);
467 writel(0, mcde->regs + MCDE_IMSCERR);
468 writel(0xFFFFFFFF, mcde->regs + MCDE_RISERR);
470 /* Spawn child devices for the DSI ports */
471 devm_of_platform_populate(dev);
473 /* Create something that will match the subdrivers when we bind */
474 for (i = 0; i < ARRAY_SIZE(mcde_component_drivers); i++) {
475 struct device_driver *drv = &mcde_component_drivers[i]->driver;
476 struct device *p = NULL, *d;
478 while ((d = platform_find_device_by_driver(p, drv))) {
480 component_match_add(dev, &match, mcde_compare_dev, d);
486 dev_err(dev, "no matching components\n");
491 dev_err(dev, "could not create component match\n");
492 ret = PTR_ERR(match);
495 ret = component_master_add_with_match(&pdev->dev, &mcde_drm_comp_ops,
498 dev_err(dev, "failed to add component master\n");
504 clk_disable_unprepare(mcde->mcde_clk);
506 regulator_disable(mcde->vana);
508 regulator_disable(mcde->epod);
515 static int mcde_remove(struct platform_device *pdev)
517 struct drm_device *drm = platform_get_drvdata(pdev);
518 struct mcde *mcde = drm->dev_private;
520 component_master_del(&pdev->dev, &mcde_drm_comp_ops);
521 clk_disable_unprepare(mcde->mcde_clk);
522 regulator_disable(mcde->vana);
523 regulator_disable(mcde->epod);
529 static const struct of_device_id mcde_of_match[] = {
531 .compatible = "ste,mcde",
536 static struct platform_driver mcde_driver = {
539 .of_match_table = of_match_ptr(mcde_of_match),
542 .remove = mcde_remove,
545 static struct platform_driver *const component_drivers[] = {
549 static int __init mcde_drm_register(void)
553 ret = platform_register_drivers(component_drivers,
554 ARRAY_SIZE(component_drivers));
558 return platform_driver_register(&mcde_driver);
561 static void __exit mcde_drm_unregister(void)
563 platform_unregister_drivers(component_drivers,
564 ARRAY_SIZE(component_drivers));
565 platform_driver_unregister(&mcde_driver);
568 module_init(mcde_drm_register);
569 module_exit(mcde_drm_unregister);
571 MODULE_ALIAS("platform:mcde-drm");
572 MODULE_DESCRIPTION(DRIVER_DESC);
574 MODULE_LICENSE("GPL");