1 // SPDX-License-Identifier: GPL-2.0
3 * Copyright © 2018 Broadcom
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>
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>
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).
31 #define TXP_DST_PTR 0x00
33 /* Pitch in bytes for raster images, 16-byte aligned. For tiled, it's
36 #define TXP_DST_PITCH 0x04
37 /* For T-tiled imgaes, DST_PITCH should be the number of tiles wide,
40 # define TXP_T_TILE_WIDTH_SHIFT 7
41 /* For LT-tiled images, DST_PITCH should be the number of utiles wide,
44 # define TXP_LT_TILE_WIDTH_SHIFT 4
46 /* Pre-rotation width/height of the image. Must match HVS config.
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.
52 * Height is limited to various numbers between 4088 and 4095. I'd
53 * just use 4088 to be safe.
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)
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)
69 /* Powers down the internal memory. */
70 # define TXP_POWERDOWN BIT(21)
72 /* Enables storing the alpha component in 8888/4444, instead of
73 * filling with ~ALPHA_INVERT.
75 # define TXP_ALPHA_ENABLE BIT(20)
77 /* 4 bits, each enables stores for a channel in each set of 4 bytes.
78 * Set to 0xf for normal operation.
80 # define TXP_BYTE_ENABLE_SHIFT 16
81 # define TXP_BYTE_ENABLE_MASK GENMASK(19, 16)
83 /* Debug: Generate VSTART again at EOF. */
84 # define TXP_VSTART_AT_EOF BIT(15)
86 /* Debug: Terminate the current frame immediately. Stops AXI
89 # define TXP_ABORT BIT(14)
91 # define TXP_DITHER BIT(13)
93 /* Inverts alpha if TXP_ALPHA_ENABLE, chooses fill value for
96 # define TXP_ALPHA_INVERT BIT(12)
98 /* Note: I've listed the channels here in high bit (in byte 3/2/1) to
99 * low bit (in byte 0) order.
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
117 /* If TFORMAT is set, generates LT instead of T format. */
118 # define TXP_LINEAR_UTILE BIT(7)
120 /* Rotate output by 90 degrees. */
121 # define TXP_TRANSPOSE BIT(6)
123 /* Generate a tiled format for V3D. */
124 # define TXP_TFORMAT BIT(5)
126 /* Generates some undefined test mode output. */
127 # define TXP_TEST_MODE BIT(4)
129 /* Request odd field from HVS. */
130 # define TXP_FIELD BIT(3)
132 /* Raise interrupt when idle. */
133 # define TXP_EI BIT(2)
135 /* Set when generating a frame, clears when idle. */
136 # define TXP_BUSY BIT(1)
138 /* Starts a frame. Self-clearing. */
139 # define TXP_GO BIT(0)
141 /* Number of lines received and committed to memory. */
142 #define TXP_PROGRESS 0x10
144 #define TXP_READ(offset) readl(txp->regs + (offset))
145 #define TXP_WRITE(offset, val) writel(val, txp->regs + (offset))
148 struct platform_device *pdev;
150 struct drm_writeback_connector connector;
153 struct debugfs_regset32 regset;
156 static inline struct vc4_txp *encoder_to_vc4_txp(struct drm_encoder *encoder)
158 return container_of(encoder, struct vc4_txp, connector.encoder);
161 static inline struct vc4_txp *connector_to_vc4_txp(struct drm_connector *conn)
163 return container_of(conn, struct vc4_txp, connector.base);
166 static const struct debugfs_reg32 txp_regs[] = {
167 VC4_REG32(TXP_DST_PTR),
168 VC4_REG32(TXP_DST_PITCH),
170 VC4_REG32(TXP_DST_CTRL),
171 VC4_REG32(TXP_PROGRESS),
174 static int vc4_txp_connector_get_modes(struct drm_connector *connector)
176 struct drm_device *dev = connector->dev;
178 return drm_add_modes_noedid(connector, dev->mode_config.max_width,
179 dev->mode_config.max_height);
182 static enum drm_mode_status
183 vc4_txp_connector_mode_valid(struct drm_connector *connector,
184 struct drm_display_mode *mode)
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;
190 if (w < mode_config->min_width || w > mode_config->max_width)
191 return MODE_BAD_HVALUE;
193 if (h < mode_config->min_height || h > mode_config->max_height)
194 return MODE_BAD_VVALUE;
199 static const u32 drm_fmts[] = {
212 static const u32 txp_fmts[] = {
225 static int vc4_txp_connector_atomic_check(struct drm_connector *conn,
226 struct drm_atomic_state *state)
228 struct drm_connector_state *conn_state;
229 struct drm_crtc_state *crtc_state;
230 struct drm_framebuffer *fb;
233 conn_state = drm_atomic_get_new_connector_state(state, conn);
234 if (!conn_state->writeback_job || !conn_state->writeback_job->fb)
237 crtc_state = drm_atomic_get_new_crtc_state(state, conn_state->crtc);
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);
247 for (i = 0; i < ARRAY_SIZE(drm_fmts); i++) {
248 if (fb->format->format == drm_fmts[i])
252 if (i == ARRAY_SIZE(drm_fmts))
255 /* Pitch must be aligned on 16 bytes. */
256 if (fb->pitches[0] & GENMASK(3, 0))
259 vc4_crtc_txp_armed(crtc_state);
264 static void vc4_txp_connector_atomic_commit(struct drm_connector *conn,
265 struct drm_connector_state *conn_state)
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;
274 if (WARN_ON(!conn_state->writeback_job ||
275 !conn_state->writeback_job->fb))
278 mode = &conn_state->crtc->state->adjusted_mode;
279 fb = conn_state->writeback_job->fb;
281 for (i = 0; i < ARRAY_SIZE(drm_fmts); i++) {
282 if (fb->format->format == drm_fmts[i])
286 if (WARN_ON(i == ARRAY_SIZE(drm_fmts)))
289 ctrl = TXP_GO | TXP_VSTART_AT_EOF | TXP_EI |
290 VC4_SET_FIELD(0xf, TXP_BYTE_ENABLE) |
291 VC4_SET_FIELD(txp_fmts[i], TXP_FORMAT);
293 if (fb->format->has_alpha)
294 ctrl |= TXP_ALPHA_ENABLE;
296 gem = drm_fb_cma_get_gem_obj(fb, 0);
297 TXP_WRITE(TXP_DST_PTR, gem->paddr + fb->offsets[0]);
298 TXP_WRITE(TXP_DST_PITCH, fb->pitches[0]);
300 VC4_SET_FIELD(mode->hdisplay, TXP_WIDTH) |
301 VC4_SET_FIELD(mode->vdisplay, TXP_HEIGHT));
303 TXP_WRITE(TXP_DST_CTRL, ctrl);
305 drm_writeback_queue_job(&txp->connector, conn_state);
308 static const struct drm_connector_helper_funcs vc4_txp_connector_helper_funcs = {
309 .get_modes = vc4_txp_connector_get_modes,
310 .mode_valid = vc4_txp_connector_mode_valid,
311 .atomic_check = vc4_txp_connector_atomic_check,
312 .atomic_commit = vc4_txp_connector_atomic_commit,
315 static enum drm_connector_status
316 vc4_txp_connector_detect(struct drm_connector *connector, bool force)
318 return connector_status_connected;
321 static void vc4_txp_connector_destroy(struct drm_connector *connector)
323 drm_connector_unregister(connector);
324 drm_connector_cleanup(connector);
327 static const struct drm_connector_funcs vc4_txp_connector_funcs = {
328 .detect = vc4_txp_connector_detect,
329 .fill_modes = drm_helper_probe_single_connector_modes,
330 .destroy = vc4_txp_connector_destroy,
331 .reset = drm_atomic_helper_connector_reset,
332 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
333 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
336 static void vc4_txp_encoder_disable(struct drm_encoder *encoder)
338 struct vc4_txp *txp = encoder_to_vc4_txp(encoder);
340 if (TXP_READ(TXP_DST_CTRL) & TXP_BUSY) {
341 unsigned long timeout = jiffies + msecs_to_jiffies(1000);
343 TXP_WRITE(TXP_DST_CTRL, TXP_ABORT);
345 while (TXP_READ(TXP_DST_CTRL) & TXP_BUSY &&
346 time_before(jiffies, timeout))
349 WARN_ON(TXP_READ(TXP_DST_CTRL) & TXP_BUSY);
352 TXP_WRITE(TXP_DST_CTRL, TXP_POWERDOWN);
355 static const struct drm_encoder_helper_funcs vc4_txp_encoder_helper_funcs = {
356 .disable = vc4_txp_encoder_disable,
359 static irqreturn_t vc4_txp_interrupt(int irq, void *data)
361 struct vc4_txp *txp = data;
363 TXP_WRITE(TXP_DST_CTRL, TXP_READ(TXP_DST_CTRL) & ~TXP_EI);
364 vc4_crtc_handle_vblank(to_vc4_crtc(txp->connector.base.state->crtc));
365 drm_writeback_signal_completion(&txp->connector, 0);
370 static int vc4_txp_bind(struct device *dev, struct device *master, void *data)
372 struct platform_device *pdev = to_platform_device(dev);
373 struct drm_device *drm = dev_get_drvdata(master);
374 struct vc4_dev *vc4 = to_vc4_dev(drm);
378 irq = platform_get_irq(pdev, 0);
382 txp = devm_kzalloc(dev, sizeof(*txp), GFP_KERNEL);
388 txp->regs = vc4_ioremap_regs(pdev, 0);
389 if (IS_ERR(txp->regs))
390 return PTR_ERR(txp->regs);
391 txp->regset.base = txp->regs;
392 txp->regset.regs = txp_regs;
393 txp->regset.nregs = ARRAY_SIZE(txp_regs);
395 drm_connector_helper_add(&txp->connector.base,
396 &vc4_txp_connector_helper_funcs);
397 ret = drm_writeback_connector_init(drm, &txp->connector,
398 &vc4_txp_connector_funcs,
399 &vc4_txp_encoder_helper_funcs,
400 drm_fmts, ARRAY_SIZE(drm_fmts));
404 ret = devm_request_irq(dev, irq, vc4_txp_interrupt, 0,
409 dev_set_drvdata(dev, txp);
412 vc4_debugfs_add_regset32(drm, "txp_regs", &txp->regset);
417 static void vc4_txp_unbind(struct device *dev, struct device *master,
420 struct drm_device *drm = dev_get_drvdata(master);
421 struct vc4_dev *vc4 = to_vc4_dev(drm);
422 struct vc4_txp *txp = dev_get_drvdata(dev);
424 vc4_txp_connector_destroy(&txp->connector.base);
429 static const struct component_ops vc4_txp_ops = {
430 .bind = vc4_txp_bind,
431 .unbind = vc4_txp_unbind,
434 static int vc4_txp_probe(struct platform_device *pdev)
436 return component_add(&pdev->dev, &vc4_txp_ops);
439 static int vc4_txp_remove(struct platform_device *pdev)
441 component_del(&pdev->dev, &vc4_txp_ops);
445 static const struct of_device_id vc4_txp_dt_match[] = {
446 { .compatible = "brcm,bcm2835-txp" },
450 struct platform_driver vc4_txp_driver = {
451 .probe = vc4_txp_probe,
452 .remove = vc4_txp_remove,
455 .of_match_table = vc4_txp_dt_match,