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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright © 2018 Broadcom
4 *
5 * Authors:
6 * Eric Anholt <eric@anholt.net>
7 * Boris Brezillon <boris.brezillon@bootlin.com>
8 */
9
10#include <linux/clk.h>
11#include <linux/component.h>
12#include <linux/of_graph.h>
13#include <linux/of_platform.h>
14#include <linux/pm_runtime.h>
15
16#include <drm/drm_atomic_helper.h>
17#include <drm/drm_edid.h>
18#include <drm/drm_fb_cma_helper.h>
19#include <drm/drm_fourcc.h>
20#include <drm/drm_panel.h>
21#include <drm/drm_probe_helper.h>
22#include <drm/drm_writeback.h>
23
24#include "vc4_drv.h"
25#include "vc4_regs.h"
26
27/* Base address of the output. Raster formats must be 4-byte aligned,
28 * T and LT must be 16-byte aligned or maybe utile-aligned (docs are
29 * inconsistent, but probably utile).
30 */
31#define TXP_DST_PTR 0x00
32
33/* Pitch in bytes for raster images, 16-byte aligned. For tiled, it's
34 * the width in tiles.
35 */
36#define TXP_DST_PITCH 0x04
37/* For T-tiled imgaes, DST_PITCH should be the number of tiles wide,
38 * shifted up.
39 */
40# define TXP_T_TILE_WIDTH_SHIFT 7
41/* For LT-tiled images, DST_PITCH should be the number of utiles wide,
42 * shifted up.
43 */
44# define TXP_LT_TILE_WIDTH_SHIFT 4
45
46/* Pre-rotation width/height of the image. Must match HVS config.
47 *
48 * If TFORMAT and 32-bit, limit is 1920 for 32-bit and 3840 to 16-bit
49 * and width/height must be tile or utile-aligned as appropriate. If
50 * transposing (rotating), width is limited to 1920.
51 *
52 * Height is limited to various numbers between 4088 and 4095. I'd
53 * just use 4088 to be safe.
54 */
55#define TXP_DIM 0x08
56# define TXP_HEIGHT_SHIFT 16
57# define TXP_HEIGHT_MASK GENMASK(31, 16)
58# define TXP_WIDTH_SHIFT 0
59# define TXP_WIDTH_MASK GENMASK(15, 0)
60
61#define TXP_DST_CTRL 0x0c
62/* These bits are set to 0x54 */
63#define TXP_PILOT_SHIFT 24
64#define TXP_PILOT_MASK GENMASK(31, 24)
65/* Bits 22-23 are set to 0x01 */
66#define TXP_VERSION_SHIFT 22
67#define TXP_VERSION_MASK GENMASK(23, 22)
68
69/* Powers down the internal memory. */
70# define TXP_POWERDOWN BIT(21)
71
72/* Enables storing the alpha component in 8888/4444, instead of
73 * filling with ~ALPHA_INVERT.
74 */
75# define TXP_ALPHA_ENABLE BIT(20)
76
77/* 4 bits, each enables stores for a channel in each set of 4 bytes.
78 * Set to 0xf for normal operation.
79 */
80# define TXP_BYTE_ENABLE_SHIFT 16
81# define TXP_BYTE_ENABLE_MASK GENMASK(19, 16)
82
83/* Debug: Generate VSTART again at EOF. */
84# define TXP_VSTART_AT_EOF BIT(15)
85
86/* Debug: Terminate the current frame immediately. Stops AXI
87 * writes.
88 */
89# define TXP_ABORT BIT(14)
90
91# define TXP_DITHER BIT(13)
92
93/* Inverts alpha if TXP_ALPHA_ENABLE, chooses fill value for
94 * !TXP_ALPHA_ENABLE.
95 */
96# define TXP_ALPHA_INVERT BIT(12)
97
98/* Note: I've listed the channels here in high bit (in byte 3/2/1) to
99 * low bit (in byte 0) order.
100 */
101# define TXP_FORMAT_SHIFT 8
102# define TXP_FORMAT_MASK GENMASK(11, 8)
103# define TXP_FORMAT_ABGR4444 0
104# define TXP_FORMAT_ARGB4444 1
105# define TXP_FORMAT_BGRA4444 2
106# define TXP_FORMAT_RGBA4444 3
107# define TXP_FORMAT_BGR565 6
108# define TXP_FORMAT_RGB565 7
109/* 888s are non-rotated, raster-only */
110# define TXP_FORMAT_BGR888 8
111# define TXP_FORMAT_RGB888 9
112# define TXP_FORMAT_ABGR8888 12
113# define TXP_FORMAT_ARGB8888 13
114# define TXP_FORMAT_BGRA8888 14
115# define TXP_FORMAT_RGBA8888 15
116
117/* If TFORMAT is set, generates LT instead of T format. */
118# define TXP_LINEAR_UTILE BIT(7)
119
120/* Rotate output by 90 degrees. */
121# define TXP_TRANSPOSE BIT(6)
122
123/* Generate a tiled format for V3D. */
124# define TXP_TFORMAT BIT(5)
125
126/* Generates some undefined test mode output. */
127# define TXP_TEST_MODE BIT(4)
128
129/* Request odd field from HVS. */
130# define TXP_FIELD BIT(3)
131
132/* Raise interrupt when idle. */
133# define TXP_EI BIT(2)
134
135/* Set when generating a frame, clears when idle. */
136# define TXP_BUSY BIT(1)
137
138/* Starts a frame. Self-clearing. */
139# define TXP_GO BIT(0)
140
141/* Number of lines received and committed to memory. */
142#define TXP_PROGRESS 0x10
143
144#define TXP_READ(offset) readl(txp->regs + (offset))
145#define TXP_WRITE(offset, val) writel(val, txp->regs + (offset))
146
147struct vc4_txp {
148 struct platform_device *pdev;
149
150 struct drm_writeback_connector connector;
151
152 void __iomem *regs;
153 struct debugfs_regset32 regset;
154};
155
156static inline struct vc4_txp *encoder_to_vc4_txp(struct drm_encoder *encoder)
157{
158 return container_of(encoder, struct vc4_txp, connector.encoder);
159}
160
161static inline struct vc4_txp *connector_to_vc4_txp(struct drm_connector *conn)
162{
163 return container_of(conn, struct vc4_txp, connector.base);
164}
165
166static const struct debugfs_reg32 txp_regs[] = {
167 VC4_REG32(TXP_DST_PTR),
168 VC4_REG32(TXP_DST_PITCH),
169 VC4_REG32(TXP_DIM),
170 VC4_REG32(TXP_DST_CTRL),
171 VC4_REG32(TXP_PROGRESS),
172};
173
174static int vc4_txp_connector_get_modes(struct drm_connector *connector)
175{
176 struct drm_device *dev = connector->dev;
177
178 return drm_add_modes_noedid(connector, dev->mode_config.max_width,
179 dev->mode_config.max_height);
180}
181
182static enum drm_mode_status
183vc4_txp_connector_mode_valid(struct drm_connector *connector,
184 struct drm_display_mode *mode)
185{
186 struct drm_device *dev = connector->dev;
187 struct drm_mode_config *mode_config = &dev->mode_config;
188 int w = mode->hdisplay, h = mode->vdisplay;
189
190 if (w < mode_config->min_width || w > mode_config->max_width)
191 return MODE_BAD_HVALUE;
192
193 if (h < mode_config->min_height || h > mode_config->max_height)
194 return MODE_BAD_VVALUE;
195
196 return MODE_OK;
197}
198
199static const u32 drm_fmts[] = {
200 DRM_FORMAT_RGB888,
201 DRM_FORMAT_BGR888,
202 DRM_FORMAT_XRGB8888,
203 DRM_FORMAT_XBGR8888,
204 DRM_FORMAT_ARGB8888,
205 DRM_FORMAT_ABGR8888,
206 DRM_FORMAT_RGBX8888,
207 DRM_FORMAT_BGRX8888,
208 DRM_FORMAT_RGBA8888,
209 DRM_FORMAT_BGRA8888,
210};
211
212static const u32 txp_fmts[] = {
213 TXP_FORMAT_RGB888,
214 TXP_FORMAT_BGR888,
215 TXP_FORMAT_ARGB8888,
216 TXP_FORMAT_ABGR8888,
217 TXP_FORMAT_ARGB8888,
218 TXP_FORMAT_ABGR8888,
219 TXP_FORMAT_RGBA8888,
220 TXP_FORMAT_BGRA8888,
221 TXP_FORMAT_RGBA8888,
222 TXP_FORMAT_BGRA8888,
223};
224
225static int vc4_txp_connector_atomic_check(struct drm_connector *conn,
226 struct drm_atomic_state *state)
227{
228 struct drm_connector_state *conn_state;
229 struct drm_crtc_state *crtc_state;
230 struct drm_framebuffer *fb;
231 int i;
232
233 conn_state = drm_atomic_get_new_connector_state(state, conn);
234 if (!conn_state->writeback_job)
235 return 0;
236
237 crtc_state = drm_atomic_get_new_crtc_state(state, conn_state->crtc);
238
239 fb = conn_state->writeback_job->fb;
240 if (fb->width != crtc_state->mode.hdisplay ||
241 fb->height != crtc_state->mode.vdisplay) {
242 DRM_DEBUG_KMS("Invalid framebuffer size %ux%u\n",
243 fb->width, fb->height);
244 return -EINVAL;
245 }
246
247 for (i = 0; i < ARRAY_SIZE(drm_fmts); i++) {
248 if (fb->format->format == drm_fmts[i])
249 break;
250 }
251
252 if (i == ARRAY_SIZE(drm_fmts))
253 return -EINVAL;
254
255 /* Pitch must be aligned on 16 bytes. */
256 if (fb->pitches[0] & GENMASK(3, 0))
257 return -EINVAL;
258
259 vc4_crtc_txp_armed(crtc_state);
260
261 return 0;
262}
263
264static void vc4_txp_connector_atomic_commit(struct drm_connector *conn,
265 struct drm_connector_state *conn_state)
266{
267 struct vc4_txp *txp = connector_to_vc4_txp(conn);
268 struct drm_gem_cma_object *gem;
269 struct drm_display_mode *mode;
270 struct drm_framebuffer *fb;
271 u32 ctrl;
272 int i;
273
274 if (WARN_ON(!conn_state->writeback_job))
275 return;
276
277 mode = &conn_state->crtc->state->adjusted_mode;
278 fb = conn_state->writeback_job->fb;
279
280 for (i = 0; i < ARRAY_SIZE(drm_fmts); i++) {
281 if (fb->format->format == drm_fmts[i])
282 break;
283 }
284
285 if (WARN_ON(i == ARRAY_SIZE(drm_fmts)))
286 return;
287
288 ctrl = TXP_GO | TXP_VSTART_AT_EOF | TXP_EI |
289 VC4_SET_FIELD(0xf, TXP_BYTE_ENABLE) |
290 VC4_SET_FIELD(txp_fmts[i], TXP_FORMAT);
291
292 if (fb->format->has_alpha)
293 ctrl |= TXP_ALPHA_ENABLE;
294
295 gem = drm_fb_cma_get_gem_obj(fb, 0);
296 TXP_WRITE(TXP_DST_PTR, gem->paddr + fb->offsets[0]);
297 TXP_WRITE(TXP_DST_PITCH, fb->pitches[0]);
298 TXP_WRITE(TXP_DIM,
299 VC4_SET_FIELD(mode->hdisplay, TXP_WIDTH) |
300 VC4_SET_FIELD(mode->vdisplay, TXP_HEIGHT));
301
302 TXP_WRITE(TXP_DST_CTRL, ctrl);
303
304 drm_writeback_queue_job(&txp->connector, conn_state);
305}
306
307static const struct drm_connector_helper_funcs vc4_txp_connector_helper_funcs = {
308 .get_modes = vc4_txp_connector_get_modes,
309 .mode_valid = vc4_txp_connector_mode_valid,
310 .atomic_check = vc4_txp_connector_atomic_check,
311 .atomic_commit = vc4_txp_connector_atomic_commit,
312};
313
314static enum drm_connector_status
315vc4_txp_connector_detect(struct drm_connector *connector, bool force)
316{
317 return connector_status_connected;
318}
319
320static void vc4_txp_connector_destroy(struct drm_connector *connector)
321{
322 drm_connector_unregister(connector);
323 drm_connector_cleanup(connector);
324}
325
326static const struct drm_connector_funcs vc4_txp_connector_funcs = {
327 .detect = vc4_txp_connector_detect,
328 .fill_modes = drm_helper_probe_single_connector_modes,
329 .destroy = vc4_txp_connector_destroy,
330 .reset = drm_atomic_helper_connector_reset,
331 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
332 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
333};
334
335static void vc4_txp_encoder_disable(struct drm_encoder *encoder)
336{
337 struct vc4_txp *txp = encoder_to_vc4_txp(encoder);
338
339 if (TXP_READ(TXP_DST_CTRL) & TXP_BUSY) {
340 unsigned long timeout = jiffies + msecs_to_jiffies(1000);
341
342 TXP_WRITE(TXP_DST_CTRL, TXP_ABORT);
343
344 while (TXP_READ(TXP_DST_CTRL) & TXP_BUSY &&
345 time_before(jiffies, timeout))
346 ;
347
348 WARN_ON(TXP_READ(TXP_DST_CTRL) & TXP_BUSY);
349 }
350
351 TXP_WRITE(TXP_DST_CTRL, TXP_POWERDOWN);
352}
353
354static const struct drm_encoder_helper_funcs vc4_txp_encoder_helper_funcs = {
355 .disable = vc4_txp_encoder_disable,
356};
357
358static irqreturn_t vc4_txp_interrupt(int irq, void *data)
359{
360 struct vc4_txp *txp = data;
361
362 TXP_WRITE(TXP_DST_CTRL, TXP_READ(TXP_DST_CTRL) & ~TXP_EI);
363 vc4_crtc_handle_vblank(to_vc4_crtc(txp->connector.base.state->crtc));
364 drm_writeback_signal_completion(&txp->connector, 0);
365
366 return IRQ_HANDLED;
367}
368
369static int vc4_txp_bind(struct device *dev, struct device *master, void *data)
370{
371 struct platform_device *pdev = to_platform_device(dev);
372 struct drm_device *drm = dev_get_drvdata(master);
373 struct vc4_dev *vc4 = to_vc4_dev(drm);
374 struct vc4_txp *txp;
375 int ret, irq;
376
377 irq = platform_get_irq(pdev, 0);
378 if (irq < 0)
379 return irq;
380
381 txp = devm_kzalloc(dev, sizeof(*txp), GFP_KERNEL);
382 if (!txp)
383 return -ENOMEM;
384
385 txp->pdev = pdev;
386
387 txp->regs = vc4_ioremap_regs(pdev, 0);
388 if (IS_ERR(txp->regs))
389 return PTR_ERR(txp->regs);
390 txp->regset.base = txp->regs;
391 txp->regset.regs = txp_regs;
392 txp->regset.nregs = ARRAY_SIZE(txp_regs);
393
394 drm_connector_helper_add(&txp->connector.base,
395 &vc4_txp_connector_helper_funcs);
396 ret = drm_writeback_connector_init(drm, &txp->connector,
397 &vc4_txp_connector_funcs,
398 &vc4_txp_encoder_helper_funcs,
399 drm_fmts, ARRAY_SIZE(drm_fmts));
400 if (ret)
401 return ret;
402
403 ret = devm_request_irq(dev, irq, vc4_txp_interrupt, 0,
404 dev_name(dev), txp);
405 if (ret)
406 return ret;
407
408 dev_set_drvdata(dev, txp);
409 vc4->txp = txp;
410
411 vc4_debugfs_add_regset32(drm, "txp_regs", &txp->regset);
412
413 return 0;
414}
415
416static void vc4_txp_unbind(struct device *dev, struct device *master,
417 void *data)
418{
419 struct drm_device *drm = dev_get_drvdata(master);
420 struct vc4_dev *vc4 = to_vc4_dev(drm);
421 struct vc4_txp *txp = dev_get_drvdata(dev);
422
423 vc4_txp_connector_destroy(&txp->connector.base);
424
425 vc4->txp = NULL;
426}
427
428static const struct component_ops vc4_txp_ops = {
429 .bind = vc4_txp_bind,
430 .unbind = vc4_txp_unbind,
431};
432
433static int vc4_txp_probe(struct platform_device *pdev)
434{
435 return component_add(&pdev->dev, &vc4_txp_ops);
436}
437
438static int vc4_txp_remove(struct platform_device *pdev)
439{
440 component_del(&pdev->dev, &vc4_txp_ops);
441 return 0;
442}
443
444static const struct of_device_id vc4_txp_dt_match[] = {
445 { .compatible = "brcm,bcm2835-txp" },
446 { /* sentinel */ },
447};
448
449struct platform_driver vc4_txp_driver = {
450 .probe = vc4_txp_probe,
451 .remove = vc4_txp_remove,
452 .driver = {
453 .name = "vc4_txp",
454 .of_match_table = vc4_txp_dt_match,
455 },
456};