1/*
  2 * rcar_du_kms.c  --  R-Car Display Unit Mode Setting
  3 *
  4 * Copyright (C) 2013 Renesas Corporation
  5 *
  6 * Contact: Laurent Pinchart (laurent.pinchart@ideasonboard.com)
  7 *
  8 * This program is free software; you can redistribute it and/or modify
  9 * it under the terms of the GNU General Public License as published by
 10 * the Free Software Foundation; either version 2 of the License, or
 11 * (at your option) any later version.
 12 */
 13
 14#include <drm/drmP.h>
 15#include <drm/drm_crtc.h>
 16#include <drm/drm_crtc_helper.h>
 17#include <drm/drm_fb_cma_helper.h>
 18#include <drm/drm_gem_cma_helper.h>
 19
 20#include "rcar_du_crtc.h"
 21#include "rcar_du_drv.h"
 22#include "rcar_du_encoder.h"
 23#include "rcar_du_kms.h"
 24#include "rcar_du_lvdsenc.h"
 25#include "rcar_du_regs.h"
 26
 27/* -----------------------------------------------------------------------------
 28 * Format helpers
 29 */
 30
 31static const struct rcar_du_format_info rcar_du_format_infos[] = {
 32	{
 33		.fourcc = DRM_FORMAT_RGB565,
 34		.bpp = 16,
 35		.planes = 1,
 36		.pnmr = PnMR_SPIM_TP | PnMR_DDDF_16BPP,
 37		.edf = PnDDCR4_EDF_NONE,
 38	}, {
 39		.fourcc = DRM_FORMAT_ARGB1555,
 40		.bpp = 16,
 41		.planes = 1,
 42		.pnmr = PnMR_SPIM_ALP | PnMR_DDDF_ARGB,
 43		.edf = PnDDCR4_EDF_NONE,
 44	}, {
 45		.fourcc = DRM_FORMAT_XRGB1555,
 46		.bpp = 16,
 47		.planes = 1,
 48		.pnmr = PnMR_SPIM_ALP | PnMR_DDDF_ARGB,
 49		.edf = PnDDCR4_EDF_NONE,
 50	}, {
 51		.fourcc = DRM_FORMAT_XRGB8888,
 52		.bpp = 32,
 53		.planes = 1,
 54		.pnmr = PnMR_SPIM_TP | PnMR_DDDF_16BPP,
 55		.edf = PnDDCR4_EDF_RGB888,
 56	}, {
 57		.fourcc = DRM_FORMAT_ARGB8888,
 58		.bpp = 32,
 59		.planes = 1,
 60		.pnmr = PnMR_SPIM_ALP | PnMR_DDDF_16BPP,
 61		.edf = PnDDCR4_EDF_ARGB8888,
 62	}, {
 63		.fourcc = DRM_FORMAT_UYVY,
 64		.bpp = 16,
 65		.planes = 1,
 66		.pnmr = PnMR_SPIM_TP_OFF | PnMR_DDDF_YC,
 67		.edf = PnDDCR4_EDF_NONE,
 68	}, {
 69		.fourcc = DRM_FORMAT_YUYV,
 70		.bpp = 16,
 71		.planes = 1,
 72		.pnmr = PnMR_SPIM_TP_OFF | PnMR_DDDF_YC,
 73		.edf = PnDDCR4_EDF_NONE,
 74	}, {
 75		.fourcc = DRM_FORMAT_NV12,
 76		.bpp = 12,
 77		.planes = 2,
 78		.pnmr = PnMR_SPIM_TP_OFF | PnMR_DDDF_YC,
 79		.edf = PnDDCR4_EDF_NONE,
 80	}, {
 81		.fourcc = DRM_FORMAT_NV21,
 82		.bpp = 12,
 83		.planes = 2,
 84		.pnmr = PnMR_SPIM_TP_OFF | PnMR_DDDF_YC,
 85		.edf = PnDDCR4_EDF_NONE,
 86	}, {
 87		/* In YUV 4:2:2, only NV16 is supported (NV61 isn't) */
 88		.fourcc = DRM_FORMAT_NV16,
 89		.bpp = 16,
 90		.planes = 2,
 91		.pnmr = PnMR_SPIM_TP_OFF | PnMR_DDDF_YC,
 92		.edf = PnDDCR4_EDF_NONE,
 93	},
 94};
 95
 96const struct rcar_du_format_info *rcar_du_format_info(u32 fourcc)
 97{
 98	unsigned int i;
 99
100	for (i = 0; i < ARRAY_SIZE(rcar_du_format_infos); ++i) {
101		if (rcar_du_format_infos[i].fourcc == fourcc)
102			return &rcar_du_format_infos[i];
103	}
104
105	return NULL;
106}
107
108/* -----------------------------------------------------------------------------
109 * Frame buffer
110 */
111
112int rcar_du_dumb_create(struct drm_file *file, struct drm_device *dev,
113			struct drm_mode_create_dumb *args)
114{
115	struct rcar_du_device *rcdu = dev->dev_private;
116	unsigned int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
117	unsigned int align;
118
119	/* The R8A7779 DU requires a 16 pixels pitch alignment as documented,
120	 * but the R8A7790 DU seems to require a 128 bytes pitch alignment.
121	 */
122	if (rcar_du_needs(rcdu, RCAR_DU_QUIRK_ALIGN_128B))
123		align = 128;
124	else
125		align = 16 * args->bpp / 8;
126
127	args->pitch = roundup(max(args->pitch, min_pitch), align);
128
129	return drm_gem_cma_dumb_create(file, dev, args);
130}
131
132static struct drm_framebuffer *
133rcar_du_fb_create(struct drm_device *dev, struct drm_file *file_priv,
134		  struct drm_mode_fb_cmd2 *mode_cmd)
135{
136	struct rcar_du_device *rcdu = dev->dev_private;
137	const struct rcar_du_format_info *format;
138	unsigned int align;
139
140	format = rcar_du_format_info(mode_cmd->pixel_format);
141	if (format == NULL) {
142		dev_dbg(dev->dev, "unsupported pixel format %08x\n",
143			mode_cmd->pixel_format);
144		return ERR_PTR(-EINVAL);
145	}
146
147	if (rcar_du_needs(rcdu, RCAR_DU_QUIRK_ALIGN_128B))
148		align = 128;
149	else
150		align = 16 * format->bpp / 8;
151
152	if (mode_cmd->pitches[0] & (align - 1) ||
153	    mode_cmd->pitches[0] >= 8192) {
154		dev_dbg(dev->dev, "invalid pitch value %u\n",
155			mode_cmd->pitches[0]);
156		return ERR_PTR(-EINVAL);
157	}
158
159	if (format->planes == 2) {
160		if (mode_cmd->pitches[1] != mode_cmd->pitches[0]) {
161			dev_dbg(dev->dev,
162				"luma and chroma pitches do not match\n");
163			return ERR_PTR(-EINVAL);
164		}
165	}
166
167	return drm_fb_cma_create(dev, file_priv, mode_cmd);
168}
169
170static void rcar_du_output_poll_changed(struct drm_device *dev)
171{
172	struct rcar_du_device *rcdu = dev->dev_private;
173
174	drm_fbdev_cma_hotplug_event(rcdu->fbdev);
175}
176
177static const struct drm_mode_config_funcs rcar_du_mode_config_funcs = {
178	.fb_create = rcar_du_fb_create,
179	.output_poll_changed = rcar_du_output_poll_changed,
180};
181
182int rcar_du_modeset_init(struct rcar_du_device *rcdu)
183{
184	static const unsigned int mmio_offsets[] = {
185		DU0_REG_OFFSET, DU2_REG_OFFSET
186	};
187
188	struct drm_device *dev = rcdu->ddev;
189	struct drm_encoder *encoder;
190	struct drm_fbdev_cma *fbdev;
191	unsigned int num_groups;
192	unsigned int i;
193	int ret;
194
195	drm_mode_config_init(dev);
196
197	dev->mode_config.min_width = 0;
198	dev->mode_config.min_height = 0;
199	dev->mode_config.max_width = 4095;
200	dev->mode_config.max_height = 2047;
201	dev->mode_config.funcs = &rcar_du_mode_config_funcs;
202
203	rcdu->num_crtcs = rcdu->info->num_crtcs;
204
205	/* Initialize the groups. */
206	num_groups = DIV_ROUND_UP(rcdu->num_crtcs, 2);
207
208	for (i = 0; i < num_groups; ++i) {
209		struct rcar_du_group *rgrp = &rcdu->groups[i];
210
211		rgrp->dev = rcdu;
212		rgrp->mmio_offset = mmio_offsets[i];
213		rgrp->index = i;
214
215		ret = rcar_du_planes_init(rgrp);
216		if (ret < 0)
217			return ret;
218	}
219
220	/* Create the CRTCs. */
221	for (i = 0; i < rcdu->num_crtcs; ++i) {
222		struct rcar_du_group *rgrp = &rcdu->groups[i / 2];
223
224		ret = rcar_du_crtc_create(rgrp, i);
225		if (ret < 0)
226			return ret;
227	}
228
229	/* Initialize the encoders. */
230	ret = rcar_du_lvdsenc_init(rcdu);
231	if (ret < 0)
232		return ret;
233
234	for (i = 0; i < rcdu->pdata->num_encoders; ++i) {
235		const struct rcar_du_encoder_data *pdata =
236			&rcdu->pdata->encoders[i];
237		const struct rcar_du_output_routing *route =
238			&rcdu->info->routes[pdata->output];
239
240		if (pdata->type == RCAR_DU_ENCODER_UNUSED)
241			continue;
242
243		if (pdata->output >= RCAR_DU_OUTPUT_MAX ||
244		    route->possible_crtcs == 0) {
245			dev_warn(rcdu->dev,
246				 "encoder %u references unexisting output %u, skipping\n",
247				 i, pdata->output);
248			continue;
249		}
250
251		ret = rcar_du_encoder_init(rcdu, pdata->type, pdata->output,
252					   pdata);
253		if (ret < 0)
254			return ret;
255	}
256
257	/* Set the possible CRTCs and possible clones. There's always at least
258	 * one way for all encoders to clone each other, set all bits in the
259	 * possible clones field.
260	 */
261	list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
262		struct rcar_du_encoder *renc = to_rcar_encoder(encoder);
263		const struct rcar_du_output_routing *route =
264			&rcdu->info->routes[renc->output];
265
266		encoder->possible_crtcs = route->possible_crtcs;
267		encoder->possible_clones = (1 << rcdu->pdata->num_encoders) - 1;
268	}
269
270	/* Now that the CRTCs have been initialized register the planes. */
271	for (i = 0; i < num_groups; ++i) {
272		ret = rcar_du_planes_register(&rcdu->groups[i]);
273		if (ret < 0)
274			return ret;
275	}
276
277	drm_kms_helper_poll_init(dev);
278
279	drm_helper_disable_unused_functions(dev);
280
281	fbdev = drm_fbdev_cma_init(dev, 32, dev->mode_config.num_crtc,
282				   dev->mode_config.num_connector);
283	if (IS_ERR(fbdev))
284		return PTR_ERR(fbdev);
285
286#ifndef CONFIG_FRAMEBUFFER_CONSOLE
287	drm_fbdev_cma_restore_mode(fbdev);
288#endif
289
290	rcdu->fbdev = fbdev;
291
292	return 0;
293}