xref: /openbmc/linux/drivers/gpu/drm/sti/sti_cursor.c (revision 62e59c4e)
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * Copyright (C) STMicroelectronics SA 2014
4  * Authors: Vincent Abriou <vincent.abriou@st.com>
5  *          Fabien Dessenne <fabien.dessenne@st.com>
6  *          for STMicroelectronics.
7  */
8 
9 #include <linux/seq_file.h>
10 
11 #include <drm/drm_atomic.h>
12 #include <drm/drm_fb_cma_helper.h>
13 #include <drm/drm_gem_cma_helper.h>
14 
15 #include "sti_compositor.h"
16 #include "sti_cursor.h"
17 #include "sti_plane.h"
18 #include "sti_vtg.h"
19 
20 /* Registers */
21 #define CUR_CTL             0x00
22 #define CUR_VPO             0x0C
23 #define CUR_PML             0x14
24 #define CUR_PMP             0x18
25 #define CUR_SIZE            0x1C
26 #define CUR_CML             0x20
27 #define CUR_AWS             0x28
28 #define CUR_AWE             0x2C
29 
30 #define CUR_CTL_CLUT_UPDATE BIT(1)
31 
32 #define STI_CURS_MIN_SIZE   1
33 #define STI_CURS_MAX_SIZE   128
34 
35 /*
36  * pixmap dma buffer structure
37  *
38  * @paddr:  physical address
39  * @size:   buffer size
40  * @base:   virtual address
41  */
42 struct dma_pixmap {
43 	dma_addr_t paddr;
44 	size_t size;
45 	void *base;
46 };
47 
48 /**
49  * STI Cursor structure
50  *
51  * @sti_plane:    sti_plane structure
52  * @dev:          driver device
53  * @regs:         cursor registers
54  * @width:        cursor width
55  * @height:       cursor height
56  * @clut:         color look up table
57  * @clut_paddr:   color look up table physical address
58  * @pixmap:       pixmap dma buffer (clut8-format cursor)
59  */
60 struct sti_cursor {
61 	struct sti_plane plane;
62 	struct device *dev;
63 	void __iomem *regs;
64 	unsigned int width;
65 	unsigned int height;
66 	unsigned short *clut;
67 	dma_addr_t clut_paddr;
68 	struct dma_pixmap pixmap;
69 };
70 
71 static const uint32_t cursor_supported_formats[] = {
72 	DRM_FORMAT_ARGB8888,
73 };
74 
75 #define to_sti_cursor(x) container_of(x, struct sti_cursor, plane)
76 
77 #define DBGFS_DUMP(reg) seq_printf(s, "\n  %-25s 0x%08X", #reg, \
78 				   readl(cursor->regs + reg))
79 
80 static void cursor_dbg_vpo(struct seq_file *s, u32 val)
81 {
82 	seq_printf(s, "\txdo:%4d\tydo:%4d", val & 0x0FFF, (val >> 16) & 0x0FFF);
83 }
84 
85 static void cursor_dbg_size(struct seq_file *s, u32 val)
86 {
87 	seq_printf(s, "\t%d x %d", val & 0x07FF, (val >> 16) & 0x07FF);
88 }
89 
90 static void cursor_dbg_pml(struct seq_file *s,
91 			   struct sti_cursor *cursor, u32 val)
92 {
93 	if (cursor->pixmap.paddr == val)
94 		seq_printf(s, "\tVirt @: %p", cursor->pixmap.base);
95 }
96 
97 static void cursor_dbg_cml(struct seq_file *s,
98 			   struct sti_cursor *cursor, u32 val)
99 {
100 	if (cursor->clut_paddr == val)
101 		seq_printf(s, "\tVirt @: %p", cursor->clut);
102 }
103 
104 static int cursor_dbg_show(struct seq_file *s, void *data)
105 {
106 	struct drm_info_node *node = s->private;
107 	struct sti_cursor *cursor = (struct sti_cursor *)node->info_ent->data;
108 
109 	seq_printf(s, "%s: (vaddr = 0x%p)",
110 		   sti_plane_to_str(&cursor->plane), cursor->regs);
111 
112 	DBGFS_DUMP(CUR_CTL);
113 	DBGFS_DUMP(CUR_VPO);
114 	cursor_dbg_vpo(s, readl(cursor->regs + CUR_VPO));
115 	DBGFS_DUMP(CUR_PML);
116 	cursor_dbg_pml(s, cursor, readl(cursor->regs + CUR_PML));
117 	DBGFS_DUMP(CUR_PMP);
118 	DBGFS_DUMP(CUR_SIZE);
119 	cursor_dbg_size(s, readl(cursor->regs + CUR_SIZE));
120 	DBGFS_DUMP(CUR_CML);
121 	cursor_dbg_cml(s, cursor, readl(cursor->regs + CUR_CML));
122 	DBGFS_DUMP(CUR_AWS);
123 	DBGFS_DUMP(CUR_AWE);
124 	seq_putc(s, '\n');
125 	return 0;
126 }
127 
128 static struct drm_info_list cursor_debugfs_files[] = {
129 	{ "cursor", cursor_dbg_show, 0, NULL },
130 };
131 
132 static int cursor_debugfs_init(struct sti_cursor *cursor,
133 			       struct drm_minor *minor)
134 {
135 	unsigned int i;
136 
137 	for (i = 0; i < ARRAY_SIZE(cursor_debugfs_files); i++)
138 		cursor_debugfs_files[i].data = cursor;
139 
140 	return drm_debugfs_create_files(cursor_debugfs_files,
141 					ARRAY_SIZE(cursor_debugfs_files),
142 					minor->debugfs_root, minor);
143 }
144 
145 static void sti_cursor_argb8888_to_clut8(struct sti_cursor *cursor, u32 *src)
146 {
147 	u8  *dst = cursor->pixmap.base;
148 	unsigned int i, j;
149 	u32 a, r, g, b;
150 
151 	for (i = 0; i < cursor->height; i++) {
152 		for (j = 0; j < cursor->width; j++) {
153 			/* Pick the 2 higher bits of each component */
154 			a = (*src >> 30) & 3;
155 			r = (*src >> 22) & 3;
156 			g = (*src >> 14) & 3;
157 			b = (*src >> 6) & 3;
158 			*dst = a << 6 | r << 4 | g << 2 | b;
159 			src++;
160 			dst++;
161 		}
162 	}
163 }
164 
165 static void sti_cursor_init(struct sti_cursor *cursor)
166 {
167 	unsigned short *base = cursor->clut;
168 	unsigned int a, r, g, b;
169 
170 	/* Assign CLUT values, ARGB444 format */
171 	for (a = 0; a < 4; a++)
172 		for (r = 0; r < 4; r++)
173 			for (g = 0; g < 4; g++)
174 				for (b = 0; b < 4; b++)
175 					*base++ = (a * 5) << 12 |
176 						  (r * 5) << 8 |
177 						  (g * 5) << 4 |
178 						  (b * 5);
179 }
180 
181 static int sti_cursor_atomic_check(struct drm_plane *drm_plane,
182 				   struct drm_plane_state *state)
183 {
184 	struct sti_plane *plane = to_sti_plane(drm_plane);
185 	struct sti_cursor *cursor = to_sti_cursor(plane);
186 	struct drm_crtc *crtc = state->crtc;
187 	struct drm_framebuffer *fb = state->fb;
188 	struct drm_crtc_state *crtc_state;
189 	struct drm_display_mode *mode;
190 	int dst_x, dst_y, dst_w, dst_h;
191 	int src_w, src_h;
192 
193 	/* no need for further checks if the plane is being disabled */
194 	if (!crtc || !fb)
195 		return 0;
196 
197 	crtc_state = drm_atomic_get_crtc_state(state->state, crtc);
198 	mode = &crtc_state->mode;
199 	dst_x = state->crtc_x;
200 	dst_y = state->crtc_y;
201 	dst_w = clamp_val(state->crtc_w, 0, mode->crtc_hdisplay - dst_x);
202 	dst_h = clamp_val(state->crtc_h, 0, mode->crtc_vdisplay - dst_y);
203 	/* src_x are in 16.16 format */
204 	src_w = state->src_w >> 16;
205 	src_h = state->src_h >> 16;
206 
207 	if (src_w < STI_CURS_MIN_SIZE ||
208 	    src_h < STI_CURS_MIN_SIZE ||
209 	    src_w > STI_CURS_MAX_SIZE ||
210 	    src_h > STI_CURS_MAX_SIZE) {
211 		DRM_ERROR("Invalid cursor size (%dx%d)\n",
212 				src_w, src_h);
213 		return -EINVAL;
214 	}
215 
216 	/* If the cursor size has changed, re-allocated the pixmap */
217 	if (!cursor->pixmap.base ||
218 	    (cursor->width != src_w) ||
219 	    (cursor->height != src_h)) {
220 		cursor->width = src_w;
221 		cursor->height = src_h;
222 
223 		if (cursor->pixmap.base)
224 			dma_free_wc(cursor->dev, cursor->pixmap.size,
225 				    cursor->pixmap.base, cursor->pixmap.paddr);
226 
227 		cursor->pixmap.size = cursor->width * cursor->height;
228 
229 		cursor->pixmap.base = dma_alloc_wc(cursor->dev,
230 						   cursor->pixmap.size,
231 						   &cursor->pixmap.paddr,
232 						   GFP_KERNEL | GFP_DMA);
233 		if (!cursor->pixmap.base) {
234 			DRM_ERROR("Failed to allocate memory for pixmap\n");
235 			return -EINVAL;
236 		}
237 	}
238 
239 	if (!drm_fb_cma_get_gem_obj(fb, 0)) {
240 		DRM_ERROR("Can't get CMA GEM object for fb\n");
241 		return -EINVAL;
242 	}
243 
244 	DRM_DEBUG_KMS("CRTC:%d (%s) drm plane:%d (%s)\n",
245 		      crtc->base.id, sti_mixer_to_str(to_sti_mixer(crtc)),
246 		      drm_plane->base.id, sti_plane_to_str(plane));
247 	DRM_DEBUG_KMS("(%dx%d)@(%d,%d)\n", dst_w, dst_h, dst_x, dst_y);
248 
249 	return 0;
250 }
251 
252 static void sti_cursor_atomic_update(struct drm_plane *drm_plane,
253 				     struct drm_plane_state *oldstate)
254 {
255 	struct drm_plane_state *state = drm_plane->state;
256 	struct sti_plane *plane = to_sti_plane(drm_plane);
257 	struct sti_cursor *cursor = to_sti_cursor(plane);
258 	struct drm_crtc *crtc = state->crtc;
259 	struct drm_framebuffer *fb = state->fb;
260 	struct drm_display_mode *mode;
261 	int dst_x, dst_y;
262 	struct drm_gem_cma_object *cma_obj;
263 	u32 y, x;
264 	u32 val;
265 
266 	if (!crtc || !fb)
267 		return;
268 
269 	mode = &crtc->mode;
270 	dst_x = state->crtc_x;
271 	dst_y = state->crtc_y;
272 
273 	cma_obj = drm_fb_cma_get_gem_obj(fb, 0);
274 
275 	/* Convert ARGB8888 to CLUT8 */
276 	sti_cursor_argb8888_to_clut8(cursor, (u32 *)cma_obj->vaddr);
277 
278 	/* AWS and AWE depend on the mode */
279 	y = sti_vtg_get_line_number(*mode, 0);
280 	x = sti_vtg_get_pixel_number(*mode, 0);
281 	val = y << 16 | x;
282 	writel(val, cursor->regs + CUR_AWS);
283 	y = sti_vtg_get_line_number(*mode, mode->vdisplay - 1);
284 	x = sti_vtg_get_pixel_number(*mode, mode->hdisplay - 1);
285 	val = y << 16 | x;
286 	writel(val, cursor->regs + CUR_AWE);
287 
288 	/* Set memory location, size, and position */
289 	writel(cursor->pixmap.paddr, cursor->regs + CUR_PML);
290 	writel(cursor->width, cursor->regs + CUR_PMP);
291 	writel(cursor->height << 16 | cursor->width, cursor->regs + CUR_SIZE);
292 
293 	y = sti_vtg_get_line_number(*mode, dst_y);
294 	x = sti_vtg_get_pixel_number(*mode, dst_x);
295 	writel((y << 16) | x, cursor->regs + CUR_VPO);
296 
297 	/* Set and fetch CLUT */
298 	writel(cursor->clut_paddr, cursor->regs + CUR_CML);
299 	writel(CUR_CTL_CLUT_UPDATE, cursor->regs + CUR_CTL);
300 
301 	sti_plane_update_fps(plane, true, false);
302 
303 	plane->status = STI_PLANE_UPDATED;
304 }
305 
306 static void sti_cursor_atomic_disable(struct drm_plane *drm_plane,
307 				      struct drm_plane_state *oldstate)
308 {
309 	struct sti_plane *plane = to_sti_plane(drm_plane);
310 
311 	if (!oldstate->crtc) {
312 		DRM_DEBUG_DRIVER("drm plane:%d not enabled\n",
313 				 drm_plane->base.id);
314 		return;
315 	}
316 
317 	DRM_DEBUG_DRIVER("CRTC:%d (%s) drm plane:%d (%s)\n",
318 			 oldstate->crtc->base.id,
319 			 sti_mixer_to_str(to_sti_mixer(oldstate->crtc)),
320 			 drm_plane->base.id, sti_plane_to_str(plane));
321 
322 	plane->status = STI_PLANE_DISABLING;
323 }
324 
325 static const struct drm_plane_helper_funcs sti_cursor_helpers_funcs = {
326 	.atomic_check = sti_cursor_atomic_check,
327 	.atomic_update = sti_cursor_atomic_update,
328 	.atomic_disable = sti_cursor_atomic_disable,
329 };
330 
331 static void sti_cursor_destroy(struct drm_plane *drm_plane)
332 {
333 	DRM_DEBUG_DRIVER("\n");
334 
335 	drm_plane_cleanup(drm_plane);
336 }
337 
338 static int sti_cursor_late_register(struct drm_plane *drm_plane)
339 {
340 	struct sti_plane *plane = to_sti_plane(drm_plane);
341 	struct sti_cursor *cursor = to_sti_cursor(plane);
342 
343 	return cursor_debugfs_init(cursor, drm_plane->dev->primary);
344 }
345 
346 static const struct drm_plane_funcs sti_cursor_plane_helpers_funcs = {
347 	.update_plane = drm_atomic_helper_update_plane,
348 	.disable_plane = drm_atomic_helper_disable_plane,
349 	.destroy = sti_cursor_destroy,
350 	.reset = sti_plane_reset,
351 	.atomic_duplicate_state = drm_atomic_helper_plane_duplicate_state,
352 	.atomic_destroy_state = drm_atomic_helper_plane_destroy_state,
353 	.late_register = sti_cursor_late_register,
354 };
355 
356 struct drm_plane *sti_cursor_create(struct drm_device *drm_dev,
357 				    struct device *dev, int desc,
358 				    void __iomem *baseaddr,
359 				    unsigned int possible_crtcs)
360 {
361 	struct sti_cursor *cursor;
362 	size_t size;
363 	int res;
364 
365 	cursor = devm_kzalloc(dev, sizeof(*cursor), GFP_KERNEL);
366 	if (!cursor) {
367 		DRM_ERROR("Failed to allocate memory for cursor\n");
368 		return NULL;
369 	}
370 
371 	/* Allocate clut buffer */
372 	size = 0x100 * sizeof(unsigned short);
373 	cursor->clut = dma_alloc_wc(dev, size, &cursor->clut_paddr,
374 				    GFP_KERNEL | GFP_DMA);
375 
376 	if (!cursor->clut) {
377 		DRM_ERROR("Failed to allocate memory for cursor clut\n");
378 		goto err_clut;
379 	}
380 
381 	cursor->dev = dev;
382 	cursor->regs = baseaddr;
383 	cursor->plane.desc = desc;
384 	cursor->plane.status = STI_PLANE_DISABLED;
385 
386 	sti_cursor_init(cursor);
387 
388 	res = drm_universal_plane_init(drm_dev, &cursor->plane.drm_plane,
389 				       possible_crtcs,
390 				       &sti_cursor_plane_helpers_funcs,
391 				       cursor_supported_formats,
392 				       ARRAY_SIZE(cursor_supported_formats),
393 				       NULL, DRM_PLANE_TYPE_CURSOR, NULL);
394 	if (res) {
395 		DRM_ERROR("Failed to initialize universal plane\n");
396 		goto err_plane;
397 	}
398 
399 	drm_plane_helper_add(&cursor->plane.drm_plane,
400 			     &sti_cursor_helpers_funcs);
401 
402 	sti_plane_init_property(&cursor->plane, DRM_PLANE_TYPE_CURSOR);
403 
404 	return &cursor->plane.drm_plane;
405 
406 err_plane:
407 	dma_free_wc(dev, size, cursor->clut, cursor->clut_paddr);
408 err_clut:
409 	devm_kfree(dev, cursor);
410 	return NULL;
411 }
412