1/*
  2 * Copyright (C) 2014 Traphandler
  3 * Copyright (C) 2014 Free Electrons
  4 *
  5 * Author: Jean-Jacques Hiblot <jjhiblot@traphandler.com>
  6 * Author: Boris BREZILLON <boris.brezillon@free-electrons.com>
  7 *
  8 * This program is free software; you can redistribute it and/or modify it
  9 * under the terms of the GNU General Public License version 2 as published by
 10 * the Free Software Foundation.
 11 *
 12 * This program is distributed in the hope that it will be useful, but WITHOUT
 13 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 14 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 15 * more details.
 16 *
 17 * You should have received a copy of the GNU General Public License along with
 18 * this program.  If not, see <http://www.gnu.org/licenses/>.
 19 */
 20
 21#include <linux/clk.h>
 22#include <linux/pm.h>
 23#include <linux/pm_runtime.h>
 24#include <linux/pinctrl/consumer.h>
 25
 26#include <drm/drm_crtc.h>
 27#include <drm/drm_crtc_helper.h>
 28#include <drm/drmP.h>
 29
 30#include <video/videomode.h>
 31
 32#include "atmel_hlcdc_dc.h"
 33
 34/**
 35 * Atmel HLCDC CRTC structure
 36 *
 37 * @base: base DRM CRTC structure
 38 * @hlcdc: pointer to the atmel_hlcdc structure provided by the MFD device
 39 * @event: pointer to the current page flip event
 40 * @id: CRTC id (returned by drm_crtc_index)
 41 * @enabled: CRTC state
 42 */
 43struct atmel_hlcdc_crtc {
 44	struct drm_crtc base;
 45	struct atmel_hlcdc_dc *dc;
 46	struct drm_pending_vblank_event *event;
 47	int id;
 48	bool enabled;
 49};
 50
 51static inline struct atmel_hlcdc_crtc *
 52drm_crtc_to_atmel_hlcdc_crtc(struct drm_crtc *crtc)
 53{
 54	return container_of(crtc, struct atmel_hlcdc_crtc, base);
 55}
 56
 57static void atmel_hlcdc_crtc_mode_set_nofb(struct drm_crtc *c)
 58{
 59	struct atmel_hlcdc_crtc *crtc = drm_crtc_to_atmel_hlcdc_crtc(c);
 60	struct regmap *regmap = crtc->dc->hlcdc->regmap;
 61	struct drm_display_mode *adj = &c->state->adjusted_mode;
 62	unsigned long mode_rate;
 63	struct videomode vm;
 64	unsigned long prate;
 65	unsigned int cfg;
 66	int div;
 67
 68	vm.vfront_porch = adj->crtc_vsync_start - adj->crtc_vdisplay;
 69	vm.vback_porch = adj->crtc_vtotal - adj->crtc_vsync_end;
 70	vm.vsync_len = adj->crtc_vsync_end - adj->crtc_vsync_start;
 71	vm.hfront_porch = adj->crtc_hsync_start - adj->crtc_hdisplay;
 72	vm.hback_porch = adj->crtc_htotal - adj->crtc_hsync_end;
 73	vm.hsync_len = adj->crtc_hsync_end - adj->crtc_hsync_start;
 74
 75	regmap_write(regmap, ATMEL_HLCDC_CFG(1),
 76		     (vm.hsync_len - 1) | ((vm.vsync_len - 1) << 16));
 77
 78	regmap_write(regmap, ATMEL_HLCDC_CFG(2),
 79		     (vm.vfront_porch - 1) | (vm.vback_porch << 16));
 80
 81	regmap_write(regmap, ATMEL_HLCDC_CFG(3),
 82		     (vm.hfront_porch - 1) | ((vm.hback_porch - 1) << 16));
 83
 84	regmap_write(regmap, ATMEL_HLCDC_CFG(4),
 85		     (adj->crtc_hdisplay - 1) |
 86		     ((adj->crtc_vdisplay - 1) << 16));
 87
 88	cfg = 0;
 89
 90	prate = clk_get_rate(crtc->dc->hlcdc->sys_clk);
 91	mode_rate = adj->crtc_clock * 1000;
 92	if ((prate / 2) < mode_rate) {
 93		prate *= 2;
 94		cfg |= ATMEL_HLCDC_CLKSEL;
 95	}
 96
 97	div = DIV_ROUND_UP(prate, mode_rate);
 98	if (div < 2)
 99		div = 2;
100
101	cfg |= ATMEL_HLCDC_CLKDIV(div);
102
103	regmap_update_bits(regmap, ATMEL_HLCDC_CFG(0),
104			   ATMEL_HLCDC_CLKSEL | ATMEL_HLCDC_CLKDIV_MASK |
105			   ATMEL_HLCDC_CLKPOL, cfg);
106
107	cfg = 0;
108
109	if (adj->flags & DRM_MODE_FLAG_NVSYNC)
110		cfg |= ATMEL_HLCDC_VSPOL;
111
112	if (adj->flags & DRM_MODE_FLAG_NHSYNC)
113		cfg |= ATMEL_HLCDC_HSPOL;
114
115	regmap_update_bits(regmap, ATMEL_HLCDC_CFG(5),
116			   ATMEL_HLCDC_HSPOL | ATMEL_HLCDC_VSPOL |
117			   ATMEL_HLCDC_VSPDLYS | ATMEL_HLCDC_VSPDLYE |
118			   ATMEL_HLCDC_DISPPOL | ATMEL_HLCDC_DISPDLY |
119			   ATMEL_HLCDC_VSPSU | ATMEL_HLCDC_VSPHO |
120			   ATMEL_HLCDC_GUARDTIME_MASK,
121			   cfg);
122}
123
124static void atmel_hlcdc_crtc_disable(struct drm_crtc *c)
125{
126	struct drm_device *dev = c->dev;
127	struct atmel_hlcdc_crtc *crtc = drm_crtc_to_atmel_hlcdc_crtc(c);
128	struct regmap *regmap = crtc->dc->hlcdc->regmap;
129	unsigned int status;
130
131	if (!crtc->enabled)
132		return;
133
134	drm_crtc_vblank_off(c);
135
136	pm_runtime_get_sync(dev->dev);
137
138	regmap_write(regmap, ATMEL_HLCDC_DIS, ATMEL_HLCDC_DISP);
139	while (!regmap_read(regmap, ATMEL_HLCDC_SR, &status) &&
140	       (status & ATMEL_HLCDC_DISP))
141		cpu_relax();
142
143	regmap_write(regmap, ATMEL_HLCDC_DIS, ATMEL_HLCDC_SYNC);
144	while (!regmap_read(regmap, ATMEL_HLCDC_SR, &status) &&
145	       (status & ATMEL_HLCDC_SYNC))
146		cpu_relax();
147
148	regmap_write(regmap, ATMEL_HLCDC_DIS, ATMEL_HLCDC_PIXEL_CLK);
149	while (!regmap_read(regmap, ATMEL_HLCDC_SR, &status) &&
150	       (status & ATMEL_HLCDC_PIXEL_CLK))
151		cpu_relax();
152
153	clk_disable_unprepare(crtc->dc->hlcdc->sys_clk);
154	pinctrl_pm_select_sleep_state(dev->dev);
155
156	pm_runtime_allow(dev->dev);
157
158	pm_runtime_put_sync(dev->dev);
159
160	crtc->enabled = false;
161}
162
163static void atmel_hlcdc_crtc_enable(struct drm_crtc *c)
164{
165	struct drm_device *dev = c->dev;
166	struct atmel_hlcdc_crtc *crtc = drm_crtc_to_atmel_hlcdc_crtc(c);
167	struct regmap *regmap = crtc->dc->hlcdc->regmap;
168	unsigned int status;
169
170	if (crtc->enabled)
171		return;
172
173	pm_runtime_get_sync(dev->dev);
174
175	pm_runtime_forbid(dev->dev);
176
177	pinctrl_pm_select_default_state(dev->dev);
178	clk_prepare_enable(crtc->dc->hlcdc->sys_clk);
179
180	regmap_write(regmap, ATMEL_HLCDC_EN, ATMEL_HLCDC_PIXEL_CLK);
181	while (!regmap_read(regmap, ATMEL_HLCDC_SR, &status) &&
182	       !(status & ATMEL_HLCDC_PIXEL_CLK))
183		cpu_relax();
184
185
186	regmap_write(regmap, ATMEL_HLCDC_EN, ATMEL_HLCDC_SYNC);
187	while (!regmap_read(regmap, ATMEL_HLCDC_SR, &status) &&
188	       !(status & ATMEL_HLCDC_SYNC))
189		cpu_relax();
190
191	regmap_write(regmap, ATMEL_HLCDC_EN, ATMEL_HLCDC_DISP);
192	while (!regmap_read(regmap, ATMEL_HLCDC_SR, &status) &&
193	       !(status & ATMEL_HLCDC_DISP))
194		cpu_relax();
195
196	pm_runtime_put_sync(dev->dev);
197
198	drm_crtc_vblank_on(c);
199
200	crtc->enabled = true;
201}
202
203void atmel_hlcdc_crtc_suspend(struct drm_crtc *c)
204{
205	struct atmel_hlcdc_crtc *crtc = drm_crtc_to_atmel_hlcdc_crtc(c);
206
207	if (crtc->enabled) {
208		atmel_hlcdc_crtc_disable(c);
209		/* save enable state for resume */
210		crtc->enabled = true;
211	}
212}
213
214void atmel_hlcdc_crtc_resume(struct drm_crtc *c)
215{
216	struct atmel_hlcdc_crtc *crtc = drm_crtc_to_atmel_hlcdc_crtc(c);
217
218	if (crtc->enabled) {
219		crtc->enabled = false;
220		atmel_hlcdc_crtc_enable(c);
221	}
222}
223
224static int atmel_hlcdc_crtc_atomic_check(struct drm_crtc *c,
225					 struct drm_crtc_state *s)
226{
227	struct atmel_hlcdc_crtc *crtc = drm_crtc_to_atmel_hlcdc_crtc(c);
228
229	if (atmel_hlcdc_dc_mode_valid(crtc->dc, &s->adjusted_mode) != MODE_OK)
230		return -EINVAL;
231
232	return atmel_hlcdc_plane_prepare_disc_area(s);
233}
234
235static void atmel_hlcdc_crtc_atomic_begin(struct drm_crtc *c,
236					  struct drm_crtc_state *old_s)
237{
238	struct atmel_hlcdc_crtc *crtc = drm_crtc_to_atmel_hlcdc_crtc(c);
239
240	if (c->state->event) {
241		c->state->event->pipe = drm_crtc_index(c);
242
243		WARN_ON(drm_crtc_vblank_get(c) != 0);
244
245		crtc->event = c->state->event;
246		c->state->event = NULL;
247	}
248}
249
250static void atmel_hlcdc_crtc_atomic_flush(struct drm_crtc *crtc,
251					  struct drm_crtc_state *old_s)
252{
253	/* TODO: write common plane control register if available */
254}
255
256static const struct drm_crtc_helper_funcs lcdc_crtc_helper_funcs = {
257	.mode_set = drm_helper_crtc_mode_set,
258	.mode_set_nofb = atmel_hlcdc_crtc_mode_set_nofb,
259	.mode_set_base = drm_helper_crtc_mode_set_base,
260	.disable = atmel_hlcdc_crtc_disable,
261	.enable = atmel_hlcdc_crtc_enable,
262	.atomic_check = atmel_hlcdc_crtc_atomic_check,
263	.atomic_begin = atmel_hlcdc_crtc_atomic_begin,
264	.atomic_flush = atmel_hlcdc_crtc_atomic_flush,
265};
266
267static void atmel_hlcdc_crtc_destroy(struct drm_crtc *c)
268{
269	struct atmel_hlcdc_crtc *crtc = drm_crtc_to_atmel_hlcdc_crtc(c);
270
271	drm_crtc_cleanup(c);
272	kfree(crtc);
273}
274
275static void atmel_hlcdc_crtc_finish_page_flip(struct atmel_hlcdc_crtc *crtc)
276{
277	struct drm_device *dev = crtc->base.dev;
278	unsigned long flags;
279
280	spin_lock_irqsave(&dev->event_lock, flags);
281	if (crtc->event) {
282		drm_send_vblank_event(dev, crtc->id, crtc->event);
283		drm_vblank_put(dev, crtc->id);
284		crtc->event = NULL;
285	}
286	spin_unlock_irqrestore(&dev->event_lock, flags);
287}
288
289void atmel_hlcdc_crtc_irq(struct drm_crtc *c)
290{
291	drm_handle_vblank(c->dev, 0);
292	atmel_hlcdc_crtc_finish_page_flip(drm_crtc_to_atmel_hlcdc_crtc(c));
293}
294
295static const struct drm_crtc_funcs atmel_hlcdc_crtc_funcs = {
296	.page_flip = drm_atomic_helper_page_flip,
297	.set_config = drm_atomic_helper_set_config,
298	.destroy = atmel_hlcdc_crtc_destroy,
299	.reset = drm_atomic_helper_crtc_reset,
300	.atomic_duplicate_state =  drm_atomic_helper_crtc_duplicate_state,
301	.atomic_destroy_state = drm_atomic_helper_crtc_destroy_state,
302};
303
304int atmel_hlcdc_crtc_create(struct drm_device *dev)
305{
306	struct atmel_hlcdc_dc *dc = dev->dev_private;
307	struct atmel_hlcdc_planes *planes = dc->planes;
308	struct atmel_hlcdc_crtc *crtc;
309	int ret;
310	int i;
311
312	crtc = kzalloc(sizeof(*crtc), GFP_KERNEL);
313	if (!crtc)
314		return -ENOMEM;
315
316	crtc->dc = dc;
317
318	ret = drm_crtc_init_with_planes(dev, &crtc->base,
319				&planes->primary->base,
320				planes->cursor ? &planes->cursor->base : NULL,
321				&atmel_hlcdc_crtc_funcs, NULL);
322	if (ret < 0)
323		goto fail;
324
325	crtc->id = drm_crtc_index(&crtc->base);
326
327	if (planes->cursor)
328		planes->cursor->base.possible_crtcs = 1 << crtc->id;
329
330	for (i = 0; i < planes->noverlays; i++)
331		planes->overlays[i]->base.possible_crtcs = 1 << crtc->id;
332
333	drm_crtc_helper_add(&crtc->base, &lcdc_crtc_helper_funcs);
334	drm_crtc_vblank_reset(&crtc->base);
335
336	dc->crtc = &crtc->base;
337
338	return 0;
339
340fail:
341	atmel_hlcdc_crtc_destroy(&crtc->base);
342	return ret;
343}