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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/dma-mapping.h>
10#include <linux/seq_file.h>
11
12#include <drm/drm_atomic.h>
13#include <drm/drm_device.h>
14#include <drm/drm_fb_dma_helper.h>
15#include <drm/drm_framebuffer.h>
16#include <drm/drm_gem_dma_helper.h>
17
18#include "sti_compositor.h"
19#include "sti_cursor.h"
20#include "sti_plane.h"
21#include "sti_vtg.h"
22
23/* Registers */
24#define CUR_CTL 0x00
25#define CUR_VPO 0x0C
26#define CUR_PML 0x14
27#define CUR_PMP 0x18
28#define CUR_SIZE 0x1C
29#define CUR_CML 0x20
30#define CUR_AWS 0x28
31#define CUR_AWE 0x2C
32
33#define CUR_CTL_CLUT_UPDATE BIT(1)
34
35#define STI_CURS_MIN_SIZE 1
36#define STI_CURS_MAX_SIZE 128
37
38/*
39 * pixmap dma buffer structure
40 *
41 * @paddr: physical address
42 * @size: buffer size
43 * @base: virtual address
44 */
45struct dma_pixmap {
46 dma_addr_t paddr;
47 size_t size;
48 void *base;
49};
50
51/*
52 * STI Cursor structure
53 *
54 * @sti_plane: sti_plane structure
55 * @dev: driver device
56 * @regs: cursor registers
57 * @width: cursor width
58 * @height: cursor height
59 * @clut: color look up table
60 * @clut_paddr: color look up table physical address
61 * @pixmap: pixmap dma buffer (clut8-format cursor)
62 */
63struct sti_cursor {
64 struct sti_plane plane;
65 struct device *dev;
66 void __iomem *regs;
67 unsigned int width;
68 unsigned int height;
69 unsigned short *clut;
70 dma_addr_t clut_paddr;
71 struct dma_pixmap pixmap;
72};
73
74static const uint32_t cursor_supported_formats[] = {
75 DRM_FORMAT_ARGB8888,
76};
77
78#define to_sti_cursor(x) container_of(x, struct sti_cursor, plane)
79
80#define DBGFS_DUMP(reg) seq_printf(s, "\n %-25s 0x%08X", #reg, \
81 readl(cursor->regs + reg))
82
83static void cursor_dbg_vpo(struct seq_file *s, u32 val)
84{
85 seq_printf(s, "\txdo:%4d\tydo:%4d", val & 0x0FFF, (val >> 16) & 0x0FFF);
86}
87
88static void cursor_dbg_size(struct seq_file *s, u32 val)
89{
90 seq_printf(s, "\t%d x %d", val & 0x07FF, (val >> 16) & 0x07FF);
91}
92
93static void cursor_dbg_pml(struct seq_file *s,
94 struct sti_cursor *cursor, u32 val)
95{
96 if (cursor->pixmap.paddr == val)
97 seq_printf(s, "\tVirt @: %p", cursor->pixmap.base);
98}
99
100static void cursor_dbg_cml(struct seq_file *s,
101 struct sti_cursor *cursor, u32 val)
102{
103 if (cursor->clut_paddr == val)
104 seq_printf(s, "\tVirt @: %p", cursor->clut);
105}
106
107static int cursor_dbg_show(struct seq_file *s, void *data)
108{
109 struct drm_info_node *node = s->private;
110 struct sti_cursor *cursor = (struct sti_cursor *)node->info_ent->data;
111
112 seq_printf(s, "%s: (vaddr = 0x%p)",
113 sti_plane_to_str(&cursor->plane), cursor->regs);
114
115 DBGFS_DUMP(CUR_CTL);
116 DBGFS_DUMP(CUR_VPO);
117 cursor_dbg_vpo(s, readl(cursor->regs + CUR_VPO));
118 DBGFS_DUMP(CUR_PML);
119 cursor_dbg_pml(s, cursor, readl(cursor->regs + CUR_PML));
120 DBGFS_DUMP(CUR_PMP);
121 DBGFS_DUMP(CUR_SIZE);
122 cursor_dbg_size(s, readl(cursor->regs + CUR_SIZE));
123 DBGFS_DUMP(CUR_CML);
124 cursor_dbg_cml(s, cursor, readl(cursor->regs + CUR_CML));
125 DBGFS_DUMP(CUR_AWS);
126 DBGFS_DUMP(CUR_AWE);
127 seq_putc(s, '\n');
128 return 0;
129}
130
131static struct drm_info_list cursor_debugfs_files[] = {
132 { "cursor", cursor_dbg_show, 0, NULL },
133};
134
135static void cursor_debugfs_init(struct sti_cursor *cursor,
136 struct drm_minor *minor)
137{
138 unsigned int i;
139
140 for (i = 0; i < ARRAY_SIZE(cursor_debugfs_files); i++)
141 cursor_debugfs_files[i].data = cursor;
142
143 drm_debugfs_create_files(cursor_debugfs_files,
144 ARRAY_SIZE(cursor_debugfs_files),
145 minor->debugfs_root, minor);
146}
147
148static void sti_cursor_argb8888_to_clut8(struct sti_cursor *cursor, u32 *src)
149{
150 u8 *dst = cursor->pixmap.base;
151 unsigned int i, j;
152 u32 a, r, g, b;
153
154 for (i = 0; i < cursor->height; i++) {
155 for (j = 0; j < cursor->width; j++) {
156 /* Pick the 2 higher bits of each component */
157 a = (*src >> 30) & 3;
158 r = (*src >> 22) & 3;
159 g = (*src >> 14) & 3;
160 b = (*src >> 6) & 3;
161 *dst = a << 6 | r << 4 | g << 2 | b;
162 src++;
163 dst++;
164 }
165 }
166}
167
168static void sti_cursor_init(struct sti_cursor *cursor)
169{
170 unsigned short *base = cursor->clut;
171 unsigned int a, r, g, b;
172
173 /* Assign CLUT values, ARGB444 format */
174 for (a = 0; a < 4; a++)
175 for (r = 0; r < 4; r++)
176 for (g = 0; g < 4; g++)
177 for (b = 0; b < 4; b++)
178 *base++ = (a * 5) << 12 |
179 (r * 5) << 8 |
180 (g * 5) << 4 |
181 (b * 5);
182}
183
184static int sti_cursor_atomic_check(struct drm_plane *drm_plane,
185 struct drm_atomic_state *state)
186{
187 struct drm_plane_state *new_plane_state = drm_atomic_get_new_plane_state(state,
188 drm_plane);
189 struct sti_plane *plane = to_sti_plane(drm_plane);
190 struct sti_cursor *cursor = to_sti_cursor(plane);
191 struct drm_crtc *crtc = new_plane_state->crtc;
192 struct drm_framebuffer *fb = new_plane_state->fb;
193 struct drm_crtc_state *crtc_state;
194 struct drm_display_mode *mode;
195 int dst_x, dst_y, dst_w, dst_h;
196 int src_w, src_h;
197
198 /* no need for further checks if the plane is being disabled */
199 if (!crtc || !fb)
200 return 0;
201
202 crtc_state = drm_atomic_get_crtc_state(state, crtc);
203 if (IS_ERR(crtc_state))
204 return PTR_ERR(crtc_state);
205
206 mode = &crtc_state->mode;
207 dst_x = new_plane_state->crtc_x;
208 dst_y = new_plane_state->crtc_y;
209 dst_w = clamp_val(new_plane_state->crtc_w, 0,
210 mode->crtc_hdisplay - dst_x);
211 dst_h = clamp_val(new_plane_state->crtc_h, 0,
212 mode->crtc_vdisplay - dst_y);
213 /* src_x are in 16.16 format */
214 src_w = new_plane_state->src_w >> 16;
215 src_h = new_plane_state->src_h >> 16;
216
217 if (src_w < STI_CURS_MIN_SIZE ||
218 src_h < STI_CURS_MIN_SIZE ||
219 src_w > STI_CURS_MAX_SIZE ||
220 src_h > STI_CURS_MAX_SIZE) {
221 DRM_ERROR("Invalid cursor size (%dx%d)\n",
222 src_w, src_h);
223 return -EINVAL;
224 }
225
226 /* If the cursor size has changed, re-allocated the pixmap */
227 if (!cursor->pixmap.base ||
228 (cursor->width != src_w) ||
229 (cursor->height != src_h)) {
230 cursor->width = src_w;
231 cursor->height = src_h;
232
233 if (cursor->pixmap.base)
234 dma_free_wc(cursor->dev, cursor->pixmap.size,
235 cursor->pixmap.base, cursor->pixmap.paddr);
236
237 cursor->pixmap.size = cursor->width * cursor->height;
238
239 cursor->pixmap.base = dma_alloc_wc(cursor->dev,
240 cursor->pixmap.size,
241 &cursor->pixmap.paddr,
242 GFP_KERNEL | GFP_DMA);
243 if (!cursor->pixmap.base) {
244 DRM_ERROR("Failed to allocate memory for pixmap\n");
245 return -EINVAL;
246 }
247 }
248
249 if (!drm_fb_dma_get_gem_obj(fb, 0)) {
250 DRM_ERROR("Can't get DMA GEM object for fb\n");
251 return -EINVAL;
252 }
253
254 DRM_DEBUG_KMS("CRTC:%d (%s) drm plane:%d (%s)\n",
255 crtc->base.id, sti_mixer_to_str(to_sti_mixer(crtc)),
256 drm_plane->base.id, sti_plane_to_str(plane));
257 DRM_DEBUG_KMS("(%dx%d)@(%d,%d)\n", dst_w, dst_h, dst_x, dst_y);
258
259 return 0;
260}
261
262static void sti_cursor_atomic_update(struct drm_plane *drm_plane,
263 struct drm_atomic_state *state)
264{
265 struct drm_plane_state *newstate = drm_atomic_get_new_plane_state(state,
266 drm_plane);
267 struct sti_plane *plane = to_sti_plane(drm_plane);
268 struct sti_cursor *cursor = to_sti_cursor(plane);
269 struct drm_crtc *crtc = newstate->crtc;
270 struct drm_framebuffer *fb = newstate->fb;
271 struct drm_display_mode *mode;
272 int dst_x, dst_y;
273 struct drm_gem_dma_object *dma_obj;
274 u32 y, x;
275 u32 val;
276
277 if (!crtc || !fb)
278 return;
279
280 mode = &crtc->mode;
281 dst_x = newstate->crtc_x;
282 dst_y = newstate->crtc_y;
283
284 dma_obj = drm_fb_dma_get_gem_obj(fb, 0);
285
286 /* Convert ARGB8888 to CLUT8 */
287 sti_cursor_argb8888_to_clut8(cursor, (u32 *)dma_obj->vaddr);
288
289 /* AWS and AWE depend on the mode */
290 y = sti_vtg_get_line_number(*mode, 0);
291 x = sti_vtg_get_pixel_number(*mode, 0);
292 val = y << 16 | x;
293 writel(val, cursor->regs + CUR_AWS);
294 y = sti_vtg_get_line_number(*mode, mode->vdisplay - 1);
295 x = sti_vtg_get_pixel_number(*mode, mode->hdisplay - 1);
296 val = y << 16 | x;
297 writel(val, cursor->regs + CUR_AWE);
298
299 /* Set memory location, size, and position */
300 writel(cursor->pixmap.paddr, cursor->regs + CUR_PML);
301 writel(cursor->width, cursor->regs + CUR_PMP);
302 writel(cursor->height << 16 | cursor->width, cursor->regs + CUR_SIZE);
303
304 y = sti_vtg_get_line_number(*mode, dst_y);
305 x = sti_vtg_get_pixel_number(*mode, dst_x);
306 writel((y << 16) | x, cursor->regs + CUR_VPO);
307
308 /* Set and fetch CLUT */
309 writel(cursor->clut_paddr, cursor->regs + CUR_CML);
310 writel(CUR_CTL_CLUT_UPDATE, cursor->regs + CUR_CTL);
311
312 sti_plane_update_fps(plane, true, false);
313
314 plane->status = STI_PLANE_UPDATED;
315}
316
317static void sti_cursor_atomic_disable(struct drm_plane *drm_plane,
318 struct drm_atomic_state *state)
319{
320 struct drm_plane_state *oldstate = drm_atomic_get_old_plane_state(state,
321 drm_plane);
322 struct sti_plane *plane = to_sti_plane(drm_plane);
323
324 if (!oldstate->crtc) {
325 DRM_DEBUG_DRIVER("drm plane:%d not enabled\n",
326 drm_plane->base.id);
327 return;
328 }
329
330 DRM_DEBUG_DRIVER("CRTC:%d (%s) drm plane:%d (%s)\n",
331 oldstate->crtc->base.id,
332 sti_mixer_to_str(to_sti_mixer(oldstate->crtc)),
333 drm_plane->base.id, sti_plane_to_str(plane));
334
335 plane->status = STI_PLANE_DISABLING;
336}
337
338static const struct drm_plane_helper_funcs sti_cursor_helpers_funcs = {
339 .atomic_check = sti_cursor_atomic_check,
340 .atomic_update = sti_cursor_atomic_update,
341 .atomic_disable = sti_cursor_atomic_disable,
342};
343
344static int sti_cursor_late_register(struct drm_plane *drm_plane)
345{
346 struct sti_plane *plane = to_sti_plane(drm_plane);
347 struct sti_cursor *cursor = to_sti_cursor(plane);
348
349 cursor_debugfs_init(cursor, drm_plane->dev->primary);
350
351 return 0;
352}
353
354static const struct drm_plane_funcs sti_cursor_plane_helpers_funcs = {
355 .update_plane = drm_atomic_helper_update_plane,
356 .disable_plane = drm_atomic_helper_disable_plane,
357 .destroy = drm_plane_cleanup,
358 .reset = drm_atomic_helper_plane_reset,
359 .atomic_duplicate_state = drm_atomic_helper_plane_duplicate_state,
360 .atomic_destroy_state = drm_atomic_helper_plane_destroy_state,
361 .late_register = sti_cursor_late_register,
362};
363
364struct drm_plane *sti_cursor_create(struct drm_device *drm_dev,
365 struct device *dev, int desc,
366 void __iomem *baseaddr,
367 unsigned int possible_crtcs)
368{
369 struct sti_cursor *cursor;
370 size_t size;
371 int res;
372
373 cursor = devm_kzalloc(dev, sizeof(*cursor), GFP_KERNEL);
374 if (!cursor) {
375 DRM_ERROR("Failed to allocate memory for cursor\n");
376 return NULL;
377 }
378
379 /* Allocate clut buffer */
380 size = 0x100 * sizeof(unsigned short);
381 cursor->clut = dma_alloc_wc(dev, size, &cursor->clut_paddr,
382 GFP_KERNEL | GFP_DMA);
383
384 if (!cursor->clut) {
385 DRM_ERROR("Failed to allocate memory for cursor clut\n");
386 goto err_clut;
387 }
388
389 cursor->dev = dev;
390 cursor->regs = baseaddr;
391 cursor->plane.desc = desc;
392 cursor->plane.status = STI_PLANE_DISABLED;
393
394 sti_cursor_init(cursor);
395
396 res = drm_universal_plane_init(drm_dev, &cursor->plane.drm_plane,
397 possible_crtcs,
398 &sti_cursor_plane_helpers_funcs,
399 cursor_supported_formats,
400 ARRAY_SIZE(cursor_supported_formats),
401 NULL, DRM_PLANE_TYPE_CURSOR, NULL);
402 if (res) {
403 DRM_ERROR("Failed to initialize universal plane\n");
404 goto err_plane;
405 }
406
407 drm_plane_helper_add(&cursor->plane.drm_plane,
408 &sti_cursor_helpers_funcs);
409
410 sti_plane_init_property(&cursor->plane, DRM_PLANE_TYPE_CURSOR);
411
412 return &cursor->plane.drm_plane;
413
414err_plane:
415 dma_free_wc(dev, size, cursor->clut, cursor->clut_paddr);
416err_clut:
417 devm_kfree(dev, cursor);
418 return NULL;
419}