2 * Copyright (C) 2012 Texas Instruments
3 * Author: Rob Clark <robdclark@gmail.com>
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 as published by
7 * the Free Software Foundation.
9 * This program is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
14 * You should have received a copy of the GNU General Public License along with
15 * this program. If not, see <http://www.gnu.org/licenses/>.
18 /* LCDC DRM driver, based on da8xx-fb */
20 #include <linux/component.h>
21 #include <linux/pinctrl/consumer.h>
22 #include <linux/suspend.h>
23 #include <drm/drm_atomic.h>
24 #include <drm/drm_atomic_helper.h>
26 #include "tilcdc_drv.h"
27 #include "tilcdc_regs.h"
28 #include "tilcdc_tfp410.h"
29 #include "tilcdc_panel.h"
30 #include "tilcdc_external.h"
32 #include "drm_fb_helper.h"
34 static LIST_HEAD(module_list
);
36 void tilcdc_module_init(struct tilcdc_module
*mod
, const char *name
,
37 const struct tilcdc_module_ops
*funcs
)
41 INIT_LIST_HEAD(&mod
->list
);
42 list_add(&mod
->list
, &module_list
);
45 void tilcdc_module_cleanup(struct tilcdc_module
*mod
)
50 static struct of_device_id tilcdc_of_match
[];
52 static struct drm_framebuffer
*tilcdc_fb_create(struct drm_device
*dev
,
53 struct drm_file
*file_priv
, const struct drm_mode_fb_cmd2
*mode_cmd
)
55 return drm_fb_cma_create(dev
, file_priv
, mode_cmd
);
58 static void tilcdc_fb_output_poll_changed(struct drm_device
*dev
)
60 struct tilcdc_drm_private
*priv
= dev
->dev_private
;
61 drm_fbdev_cma_hotplug_event(priv
->fbdev
);
64 int tilcdc_atomic_check(struct drm_device
*dev
,
65 struct drm_atomic_state
*state
)
69 ret
= drm_atomic_helper_check_modeset(dev
, state
);
73 ret
= drm_atomic_helper_check_planes(dev
, state
);
78 * tilcdc ->atomic_check can update ->mode_changed if pixel format
79 * changes, hence will we check modeset changes again.
81 ret
= drm_atomic_helper_check_modeset(dev
, state
);
88 static int tilcdc_commit(struct drm_device
*dev
,
89 struct drm_atomic_state
*state
,
94 ret
= drm_atomic_helper_prepare_planes(dev
, state
);
98 drm_atomic_helper_swap_state(state
, true);
101 * Everything below can be run asynchronously without the need to grab
102 * any modeset locks at all under one condition: It must be guaranteed
103 * that the asynchronous work has either been cancelled (if the driver
104 * supports it, which at least requires that the framebuffers get
105 * cleaned up with drm_atomic_helper_cleanup_planes()) or completed
106 * before the new state gets committed on the software side with
107 * drm_atomic_helper_swap_state().
109 * This scheme allows new atomic state updates to be prepared and
110 * checked in parallel to the asynchronous completion of the previous
111 * update. Which is important since compositors need to figure out the
112 * composition of the next frame right after having submitted the
116 /* Keep HW on while we commit the state. */
117 pm_runtime_get_sync(dev
->dev
);
119 drm_atomic_helper_commit_modeset_disables(dev
, state
);
121 drm_atomic_helper_commit_planes(dev
, state
, false);
123 drm_atomic_helper_commit_modeset_enables(dev
, state
);
125 /* Now HW should remain on if need becase the crtc is enabled */
126 pm_runtime_put_sync(dev
->dev
);
128 drm_atomic_helper_wait_for_vblanks(dev
, state
);
130 drm_atomic_helper_cleanup_planes(dev
, state
);
132 drm_atomic_state_free(state
);
137 static const struct drm_mode_config_funcs mode_config_funcs
= {
138 .fb_create
= tilcdc_fb_create
,
139 .output_poll_changed
= tilcdc_fb_output_poll_changed
,
140 .atomic_check
= tilcdc_atomic_check
,
141 .atomic_commit
= tilcdc_commit
,
144 static int modeset_init(struct drm_device
*dev
)
146 struct tilcdc_drm_private
*priv
= dev
->dev_private
;
147 struct tilcdc_module
*mod
;
149 drm_mode_config_init(dev
);
151 priv
->crtc
= tilcdc_crtc_create(dev
);
153 list_for_each_entry(mod
, &module_list
, list
) {
154 DBG("loading module: %s", mod
->name
);
155 mod
->funcs
->modeset_init(mod
, dev
);
158 dev
->mode_config
.min_width
= 0;
159 dev
->mode_config
.min_height
= 0;
160 dev
->mode_config
.max_width
= tilcdc_crtc_max_width(priv
->crtc
);
161 dev
->mode_config
.max_height
= 2048;
162 dev
->mode_config
.funcs
= &mode_config_funcs
;
167 #ifdef CONFIG_CPU_FREQ
168 static int cpufreq_transition(struct notifier_block
*nb
,
169 unsigned long val
, void *data
)
171 struct tilcdc_drm_private
*priv
= container_of(nb
,
172 struct tilcdc_drm_private
, freq_transition
);
173 if (val
== CPUFREQ_POSTCHANGE
) {
174 if (priv
->lcd_fck_rate
!= clk_get_rate(priv
->clk
)) {
175 priv
->lcd_fck_rate
= clk_get_rate(priv
->clk
);
176 tilcdc_crtc_update_clk(priv
->crtc
);
188 static int tilcdc_unload(struct drm_device
*dev
)
190 struct tilcdc_drm_private
*priv
= dev
->dev_private
;
192 tilcdc_crtc_disable(priv
->crtc
);
194 tilcdc_remove_external_encoders(dev
);
196 drm_fbdev_cma_fini(priv
->fbdev
);
197 drm_kms_helper_poll_fini(dev
);
198 drm_mode_config_cleanup(dev
);
199 drm_vblank_cleanup(dev
);
201 drm_irq_uninstall(dev
);
203 #ifdef CONFIG_CPU_FREQ
204 cpufreq_unregister_notifier(&priv
->freq_transition
,
205 CPUFREQ_TRANSITION_NOTIFIER
);
214 flush_workqueue(priv
->wq
);
215 destroy_workqueue(priv
->wq
);
217 dev
->dev_private
= NULL
;
219 pm_runtime_disable(dev
->dev
);
224 static int tilcdc_load(struct drm_device
*dev
, unsigned long flags
)
226 struct platform_device
*pdev
= dev
->platformdev
;
227 struct device_node
*node
= pdev
->dev
.of_node
;
228 struct tilcdc_drm_private
*priv
;
229 struct tilcdc_module
*mod
;
230 struct resource
*res
;
234 priv
= devm_kzalloc(dev
->dev
, sizeof(*priv
), GFP_KERNEL
);
236 dev_err(dev
->dev
, "failed to allocate private data\n");
240 dev
->dev_private
= priv
;
242 priv
->is_componentized
=
243 tilcdc_get_external_components(dev
->dev
, NULL
) > 0;
245 priv
->wq
= alloc_ordered_workqueue("tilcdc", 0);
248 goto fail_unset_priv
;
251 res
= platform_get_resource(pdev
, IORESOURCE_MEM
, 0);
253 dev_err(dev
->dev
, "failed to get memory resource\n");
258 priv
->mmio
= ioremap_nocache(res
->start
, resource_size(res
));
260 dev_err(dev
->dev
, "failed to ioremap\n");
265 priv
->clk
= clk_get(dev
->dev
, "fck");
266 if (IS_ERR(priv
->clk
)) {
267 dev_err(dev
->dev
, "failed to get functional clock\n");
272 #ifdef CONFIG_CPU_FREQ
273 priv
->lcd_fck_rate
= clk_get_rate(priv
->clk
);
274 priv
->freq_transition
.notifier_call
= cpufreq_transition
;
275 ret
= cpufreq_register_notifier(&priv
->freq_transition
,
276 CPUFREQ_TRANSITION_NOTIFIER
);
278 dev_err(dev
->dev
, "failed to register cpufreq notifier\n");
283 if (of_property_read_u32(node
, "max-bandwidth", &priv
->max_bandwidth
))
284 priv
->max_bandwidth
= TILCDC_DEFAULT_MAX_BANDWIDTH
;
286 DBG("Maximum Bandwidth Value %d", priv
->max_bandwidth
);
288 if (of_property_read_u32(node
, "ti,max-width", &priv
->max_width
))
289 priv
->max_width
= TILCDC_DEFAULT_MAX_WIDTH
;
291 DBG("Maximum Horizontal Pixel Width Value %dpixels", priv
->max_width
);
293 if (of_property_read_u32(node
, "ti,max-pixelclock",
294 &priv
->max_pixelclock
))
295 priv
->max_pixelclock
= TILCDC_DEFAULT_MAX_PIXELCLOCK
;
297 DBG("Maximum Pixel Clock Value %dKHz", priv
->max_pixelclock
);
299 pm_runtime_enable(dev
->dev
);
301 /* Determine LCD IP Version */
302 pm_runtime_get_sync(dev
->dev
);
303 switch (tilcdc_read(dev
, LCDC_PID_REG
)) {
312 dev_warn(dev
->dev
, "Unknown PID Reg value 0x%08x, "
313 "defaulting to LCD revision 1\n",
314 tilcdc_read(dev
, LCDC_PID_REG
));
319 pm_runtime_put_sync(dev
->dev
);
321 ret
= modeset_init(dev
);
323 dev_err(dev
->dev
, "failed to initialize mode setting\n");
324 goto fail_cpufreq_unregister
;
327 platform_set_drvdata(pdev
, dev
);
329 if (priv
->is_componentized
) {
330 ret
= component_bind_all(dev
->dev
, dev
);
332 goto fail_mode_config_cleanup
;
334 ret
= tilcdc_add_external_encoders(dev
, &bpp
);
336 goto fail_component_cleanup
;
339 if ((priv
->num_encoders
== 0) || (priv
->num_connectors
== 0)) {
340 dev_err(dev
->dev
, "no encoders/connectors found\n");
342 goto fail_external_cleanup
;
345 ret
= drm_vblank_init(dev
, 1);
347 dev_err(dev
->dev
, "failed to initialize vblank\n");
348 goto fail_external_cleanup
;
351 ret
= drm_irq_install(dev
, platform_get_irq(dev
->platformdev
, 0));
353 dev_err(dev
->dev
, "failed to install IRQ handler\n");
354 goto fail_vblank_cleanup
;
357 list_for_each_entry(mod
, &module_list
, list
) {
358 DBG("%s: preferred_bpp: %d", mod
->name
, mod
->preferred_bpp
);
359 bpp
= mod
->preferred_bpp
;
364 drm_helper_disable_unused_functions(dev
);
366 drm_mode_config_reset(dev
);
368 priv
->fbdev
= drm_fbdev_cma_init(dev
, bpp
,
369 dev
->mode_config
.num_crtc
,
370 dev
->mode_config
.num_connector
);
371 if (IS_ERR(priv
->fbdev
)) {
372 ret
= PTR_ERR(priv
->fbdev
);
373 goto fail_irq_uninstall
;
376 drm_kms_helper_poll_init(dev
);
381 drm_irq_uninstall(dev
);
384 drm_vblank_cleanup(dev
);
386 fail_mode_config_cleanup
:
387 drm_mode_config_cleanup(dev
);
389 fail_component_cleanup
:
390 if (priv
->is_componentized
)
391 component_unbind_all(dev
->dev
, dev
);
393 fail_external_cleanup
:
394 tilcdc_remove_external_encoders(dev
);
396 fail_cpufreq_unregister
:
397 pm_runtime_disable(dev
->dev
);
398 #ifdef CONFIG_CPU_FREQ
399 cpufreq_unregister_notifier(&priv
->freq_transition
,
400 CPUFREQ_TRANSITION_NOTIFIER
);
410 flush_workqueue(priv
->wq
);
411 destroy_workqueue(priv
->wq
);
414 dev
->dev_private
= NULL
;
419 static void tilcdc_lastclose(struct drm_device
*dev
)
421 struct tilcdc_drm_private
*priv
= dev
->dev_private
;
422 drm_fbdev_cma_restore_mode(priv
->fbdev
);
425 static irqreturn_t
tilcdc_irq(int irq
, void *arg
)
427 struct drm_device
*dev
= arg
;
428 struct tilcdc_drm_private
*priv
= dev
->dev_private
;
429 return tilcdc_crtc_irq(priv
->crtc
);
432 static int tilcdc_enable_vblank(struct drm_device
*dev
, unsigned int pipe
)
437 static void tilcdc_disable_vblank(struct drm_device
*dev
, unsigned int pipe
)
442 #if defined(CONFIG_DEBUG_FS)
443 static const struct {
449 #define REG(rev, save, reg) { #reg, rev, save, reg }
450 /* exists in revision 1: */
451 REG(1, false, LCDC_PID_REG
),
452 REG(1, true, LCDC_CTRL_REG
),
453 REG(1, false, LCDC_STAT_REG
),
454 REG(1, true, LCDC_RASTER_CTRL_REG
),
455 REG(1, true, LCDC_RASTER_TIMING_0_REG
),
456 REG(1, true, LCDC_RASTER_TIMING_1_REG
),
457 REG(1, true, LCDC_RASTER_TIMING_2_REG
),
458 REG(1, true, LCDC_DMA_CTRL_REG
),
459 REG(1, true, LCDC_DMA_FB_BASE_ADDR_0_REG
),
460 REG(1, true, LCDC_DMA_FB_CEILING_ADDR_0_REG
),
461 REG(1, true, LCDC_DMA_FB_BASE_ADDR_1_REG
),
462 REG(1, true, LCDC_DMA_FB_CEILING_ADDR_1_REG
),
463 /* new in revision 2: */
464 REG(2, false, LCDC_RAW_STAT_REG
),
465 REG(2, false, LCDC_MASKED_STAT_REG
),
466 REG(2, true, LCDC_INT_ENABLE_SET_REG
),
467 REG(2, false, LCDC_INT_ENABLE_CLR_REG
),
468 REG(2, false, LCDC_END_OF_INT_IND_REG
),
469 REG(2, true, LCDC_CLK_ENABLE_REG
),
475 #ifdef CONFIG_DEBUG_FS
476 static int tilcdc_regs_show(struct seq_file
*m
, void *arg
)
478 struct drm_info_node
*node
= (struct drm_info_node
*) m
->private;
479 struct drm_device
*dev
= node
->minor
->dev
;
480 struct tilcdc_drm_private
*priv
= dev
->dev_private
;
483 pm_runtime_get_sync(dev
->dev
);
485 seq_printf(m
, "revision: %d\n", priv
->rev
);
487 for (i
= 0; i
< ARRAY_SIZE(registers
); i
++)
488 if (priv
->rev
>= registers
[i
].rev
)
489 seq_printf(m
, "%s:\t %08x\n", registers
[i
].name
,
490 tilcdc_read(dev
, registers
[i
].reg
));
492 pm_runtime_put_sync(dev
->dev
);
497 static int tilcdc_mm_show(struct seq_file
*m
, void *arg
)
499 struct drm_info_node
*node
= (struct drm_info_node
*) m
->private;
500 struct drm_device
*dev
= node
->minor
->dev
;
501 return drm_mm_dump_table(m
, &dev
->vma_offset_manager
->vm_addr_space_mm
);
504 static struct drm_info_list tilcdc_debugfs_list
[] = {
505 { "regs", tilcdc_regs_show
, 0 },
506 { "mm", tilcdc_mm_show
, 0 },
507 { "fb", drm_fb_cma_debugfs_show
, 0 },
510 static int tilcdc_debugfs_init(struct drm_minor
*minor
)
512 struct drm_device
*dev
= minor
->dev
;
513 struct tilcdc_module
*mod
;
516 ret
= drm_debugfs_create_files(tilcdc_debugfs_list
,
517 ARRAY_SIZE(tilcdc_debugfs_list
),
518 minor
->debugfs_root
, minor
);
520 list_for_each_entry(mod
, &module_list
, list
)
521 if (mod
->funcs
->debugfs_init
)
522 mod
->funcs
->debugfs_init(mod
, minor
);
525 dev_err(dev
->dev
, "could not install tilcdc_debugfs_list\n");
532 static void tilcdc_debugfs_cleanup(struct drm_minor
*minor
)
534 struct tilcdc_module
*mod
;
535 drm_debugfs_remove_files(tilcdc_debugfs_list
,
536 ARRAY_SIZE(tilcdc_debugfs_list
), minor
);
538 list_for_each_entry(mod
, &module_list
, list
)
539 if (mod
->funcs
->debugfs_cleanup
)
540 mod
->funcs
->debugfs_cleanup(mod
, minor
);
544 static const struct file_operations fops
= {
545 .owner
= THIS_MODULE
,
547 .release
= drm_release
,
548 .unlocked_ioctl
= drm_ioctl
,
550 .compat_ioctl
= drm_compat_ioctl
,
555 .mmap
= drm_gem_cma_mmap
,
558 static struct drm_driver tilcdc_driver
= {
559 .driver_features
= (DRIVER_HAVE_IRQ
| DRIVER_GEM
| DRIVER_MODESET
|
560 DRIVER_PRIME
| DRIVER_ATOMIC
),
562 .unload
= tilcdc_unload
,
563 .lastclose
= tilcdc_lastclose
,
564 .irq_handler
= tilcdc_irq
,
565 .get_vblank_counter
= drm_vblank_no_hw_counter
,
566 .enable_vblank
= tilcdc_enable_vblank
,
567 .disable_vblank
= tilcdc_disable_vblank
,
568 .gem_free_object_unlocked
= drm_gem_cma_free_object
,
569 .gem_vm_ops
= &drm_gem_cma_vm_ops
,
570 .dumb_create
= drm_gem_cma_dumb_create
,
571 .dumb_map_offset
= drm_gem_cma_dumb_map_offset
,
572 .dumb_destroy
= drm_gem_dumb_destroy
,
574 .prime_handle_to_fd
= drm_gem_prime_handle_to_fd
,
575 .prime_fd_to_handle
= drm_gem_prime_fd_to_handle
,
576 .gem_prime_import
= drm_gem_prime_import
,
577 .gem_prime_export
= drm_gem_prime_export
,
578 .gem_prime_get_sg_table
= drm_gem_cma_prime_get_sg_table
,
579 .gem_prime_import_sg_table
= drm_gem_cma_prime_import_sg_table
,
580 .gem_prime_vmap
= drm_gem_cma_prime_vmap
,
581 .gem_prime_vunmap
= drm_gem_cma_prime_vunmap
,
582 .gem_prime_mmap
= drm_gem_cma_prime_mmap
,
583 #ifdef CONFIG_DEBUG_FS
584 .debugfs_init
= tilcdc_debugfs_init
,
585 .debugfs_cleanup
= tilcdc_debugfs_cleanup
,
589 .desc
= "TI LCD Controller DRM",
599 #ifdef CONFIG_PM_SLEEP
600 static int tilcdc_pm_suspend(struct device
*dev
)
602 struct drm_device
*ddev
= dev_get_drvdata(dev
);
603 struct tilcdc_drm_private
*priv
= ddev
->dev_private
;
605 priv
->saved_state
= drm_atomic_helper_suspend(ddev
);
607 /* Select sleep pin state */
608 pinctrl_pm_select_sleep_state(dev
);
613 static int tilcdc_pm_resume(struct device
*dev
)
615 struct drm_device
*ddev
= dev_get_drvdata(dev
);
616 struct tilcdc_drm_private
*priv
= ddev
->dev_private
;
619 /* Select default pin state */
620 pinctrl_pm_select_default_state(dev
);
622 if (priv
->saved_state
)
623 ret
= drm_atomic_helper_resume(ddev
, priv
->saved_state
);
629 static const struct dev_pm_ops tilcdc_pm_ops
= {
630 SET_SYSTEM_SLEEP_PM_OPS(tilcdc_pm_suspend
, tilcdc_pm_resume
)
637 static int tilcdc_bind(struct device
*dev
)
639 return drm_platform_init(&tilcdc_driver
, to_platform_device(dev
));
642 static void tilcdc_unbind(struct device
*dev
)
644 struct drm_device
*ddev
= dev_get_drvdata(dev
);
646 /* Check if a subcomponent has already triggered the unloading. */
647 if (!ddev
->dev_private
)
650 drm_put_dev(dev_get_drvdata(dev
));
653 static const struct component_master_ops tilcdc_comp_ops
= {
655 .unbind
= tilcdc_unbind
,
658 static int tilcdc_pdev_probe(struct platform_device
*pdev
)
660 struct component_match
*match
= NULL
;
663 /* bail out early if no DT data: */
664 if (!pdev
->dev
.of_node
) {
665 dev_err(&pdev
->dev
, "device-tree data is missing\n");
669 ret
= tilcdc_get_external_components(&pdev
->dev
, &match
);
673 return drm_platform_init(&tilcdc_driver
, pdev
);
675 return component_master_add_with_match(&pdev
->dev
,
680 static int tilcdc_pdev_remove(struct platform_device
*pdev
)
684 ret
= tilcdc_get_external_components(&pdev
->dev
, NULL
);
688 drm_put_dev(platform_get_drvdata(pdev
));
690 component_master_del(&pdev
->dev
, &tilcdc_comp_ops
);
695 static struct of_device_id tilcdc_of_match
[] = {
696 { .compatible
= "ti,am33xx-tilcdc", },
699 MODULE_DEVICE_TABLE(of
, tilcdc_of_match
);
701 static struct platform_driver tilcdc_platform_driver
= {
702 .probe
= tilcdc_pdev_probe
,
703 .remove
= tilcdc_pdev_remove
,
706 .pm
= &tilcdc_pm_ops
,
707 .of_match_table
= tilcdc_of_match
,
711 static int __init
tilcdc_drm_init(void)
714 tilcdc_tfp410_init();
716 return platform_driver_register(&tilcdc_platform_driver
);
719 static void __exit
tilcdc_drm_fini(void)
722 platform_driver_unregister(&tilcdc_platform_driver
);
724 tilcdc_tfp410_fini();
727 module_init(tilcdc_drm_init
);
728 module_exit(tilcdc_drm_fini
);
730 MODULE_AUTHOR("Rob Clark <robdclark@gmail.com");
731 MODULE_DESCRIPTION("TI LCD Controller DRM Driver");
732 MODULE_LICENSE("GPL");