3 * Copyright 2012 Red Hat
5 * This file is subject to the terms and conditions of the GNU General
6 * Public License version 2. See the file COPYING in the main
7 * directory of this archive for more details.
9 * Authors: Matthew Garrett
12 * Portions of this code derived from cirrusfb.c:
13 * drivers/video/cirrusfb.c - driver for Cirrus Logic chipsets
18 #include <drm/drm_crtc_helper.h>
19 #include <drm/drm_plane_helper.h>
21 #include <video/cirrus.h>
23 #include "cirrus_drv.h"
25 #define CIRRUS_LUT_SIZE 256
27 #define PALETTE_INDEX 0x8
28 #define PALETTE_DATA 0x9
31 * This file contains setup code for the CRTC.
34 static void cirrus_crtc_load_lut(struct drm_crtc *crtc)
36 struct cirrus_crtc *cirrus_crtc = to_cirrus_crtc(crtc);
37 struct drm_device *dev = crtc->dev;
38 struct cirrus_device *cdev = dev->dev_private;
44 for (i = 0; i < CIRRUS_LUT_SIZE; i++) {
46 WREG8(PALETTE_INDEX, i);
47 WREG8(PALETTE_DATA, cirrus_crtc->lut_r[i]);
48 WREG8(PALETTE_DATA, cirrus_crtc->lut_g[i]);
49 WREG8(PALETTE_DATA, cirrus_crtc->lut_b[i]);
54 * The DRM core requires DPMS functions, but they make little sense in our
55 * case and so are just stubs
58 static void cirrus_crtc_dpms(struct drm_crtc *crtc, int mode)
60 struct drm_device *dev = crtc->dev;
61 struct cirrus_device *cdev = dev->dev_private;
65 case DRM_MODE_DPMS_ON:
69 case DRM_MODE_DPMS_STANDBY:
73 case DRM_MODE_DPMS_SUSPEND:
77 case DRM_MODE_DPMS_OFF:
85 WREG8(SEQ_INDEX, 0x1);
86 sr01 |= RREG8(SEQ_DATA) & ~0x20;
89 WREG8(GFX_INDEX, 0xe);
90 gr0e |= RREG8(GFX_DATA) & ~0x06;
95 * The core passes the desired mode to the CRTC code to see whether any
96 * CRTC-specific modifications need to be made to it. We're in a position
97 * to just pass that straight through, so this does nothing
99 static bool cirrus_crtc_mode_fixup(struct drm_crtc *crtc,
100 const struct drm_display_mode *mode,
101 struct drm_display_mode *adjusted_mode)
106 static void cirrus_set_start_address(struct drm_crtc *crtc, unsigned offset)
108 struct cirrus_device *cdev = crtc->dev->dev_private;
113 WREG_CRT(0x0c, (u8)((addr >> 8) & 0xff));
114 WREG_CRT(0x0d, (u8)(addr & 0xff));
116 WREG8(CRT_INDEX, 0x1b);
117 tmp = RREG8(CRT_DATA);
119 tmp |= (addr >> 16) & 0x01;
120 tmp |= (addr >> 15) & 0x0c;
122 WREG8(CRT_INDEX, 0x1d);
123 tmp = RREG8(CRT_DATA);
125 tmp |= (addr >> 12) & 0x80;
129 /* cirrus is different - we will force move buffers out of VRAM */
130 static int cirrus_crtc_do_set_base(struct drm_crtc *crtc,
131 struct drm_framebuffer *fb,
132 int x, int y, int atomic)
134 struct cirrus_device *cdev = crtc->dev->dev_private;
135 struct drm_gem_object *obj;
136 struct cirrus_framebuffer *cirrus_fb;
137 struct cirrus_bo *bo;
141 /* push the previous fb to system ram */
143 cirrus_fb = to_cirrus_framebuffer(fb);
144 obj = cirrus_fb->obj;
145 bo = gem_to_cirrus_bo(obj);
146 ret = cirrus_bo_reserve(bo, false);
149 cirrus_bo_push_sysram(bo);
150 cirrus_bo_unreserve(bo);
153 cirrus_fb = to_cirrus_framebuffer(crtc->primary->fb);
154 obj = cirrus_fb->obj;
155 bo = gem_to_cirrus_bo(obj);
157 ret = cirrus_bo_reserve(bo, false);
161 ret = cirrus_bo_pin(bo, TTM_PL_FLAG_VRAM, &gpu_addr);
163 cirrus_bo_unreserve(bo);
167 if (&cdev->mode_info.gfbdev->gfb == cirrus_fb) {
168 /* if pushing console in kmap it */
169 ret = ttm_bo_kmap(&bo->bo, 0, bo->bo.num_pages, &bo->kmap);
171 DRM_ERROR("failed to kmap fbcon\n");
173 cirrus_bo_unreserve(bo);
175 cirrus_set_start_address(crtc, (u32)gpu_addr);
179 static int cirrus_crtc_mode_set_base(struct drm_crtc *crtc, int x, int y,
180 struct drm_framebuffer *old_fb)
182 return cirrus_crtc_do_set_base(crtc, old_fb, x, y, 0);
186 * The meat of this driver. The core passes us a mode and we have to program
187 * it. The modesetting here is the bare minimum required to satisfy the qemu
188 * emulation of this hardware, and running this against a real device is
189 * likely to result in an inadequately programmed mode. We've already had
190 * the opportunity to modify the mode, so whatever we receive here should
191 * be something that can be correctly programmed and displayed
193 static int cirrus_crtc_mode_set(struct drm_crtc *crtc,
194 struct drm_display_mode *mode,
195 struct drm_display_mode *adjusted_mode,
196 int x, int y, struct drm_framebuffer *old_fb)
198 struct drm_device *dev = crtc->dev;
199 struct cirrus_device *cdev = dev->dev_private;
200 int hsyncstart, hsyncend, htotal, hdispend;
201 int vtotal, vdispend;
203 int sr07 = 0, hdr = 0;
205 htotal = mode->htotal / 8;
206 hsyncend = mode->hsync_end / 8;
207 hsyncstart = mode->hsync_start / 8;
208 hdispend = mode->hdisplay / 8;
210 vtotal = mode->vtotal;
211 vdispend = mode->vdisplay;
221 WREG_CRT(VGA_CRTC_V_SYNC_END, 0x20);
222 WREG_CRT(VGA_CRTC_H_TOTAL, htotal);
223 WREG_CRT(VGA_CRTC_H_DISP, hdispend);
224 WREG_CRT(VGA_CRTC_H_SYNC_START, hsyncstart);
225 WREG_CRT(VGA_CRTC_H_SYNC_END, hsyncend);
226 WREG_CRT(VGA_CRTC_V_TOTAL, vtotal & 0xff);
227 WREG_CRT(VGA_CRTC_V_DISP_END, vdispend & 0xff);
230 if ((vdispend + 1) & 512)
232 WREG_CRT(VGA_CRTC_MAX_SCAN, tmp);
235 * Overflow bits for values that don't fit in the standard registers
242 if ((vdispend + 1) & 256)
248 WREG_CRT(VGA_CRTC_OVERFLOW, tmp);
252 /* More overflow bits */
254 if ((htotal + 5) & 64)
256 if ((htotal + 5) & 128)
263 WREG_CRT(CL_CRT1A, tmp);
265 /* Disable Hercules/CGA compatibility */
266 WREG_CRT(VGA_CRTC_MODE, 0x03);
268 WREG8(SEQ_INDEX, 0x7);
269 sr07 = RREG8(SEQ_DATA);
272 switch (crtc->primary->fb->bits_per_pixel) {
294 /* Program the pitch */
295 tmp = crtc->primary->fb->pitches[0] / 8;
296 WREG_CRT(VGA_CRTC_OFFSET, tmp);
298 /* Enable extended blanking and pitch bits, and enable full memory */
300 tmp |= (crtc->primary->fb->pitches[0] >> 7) & 0x10;
301 tmp |= (crtc->primary->fb->pitches[0] >> 6) & 0x40;
304 /* Enable high-colour modes */
305 WREG_GFX(VGA_GFX_MODE, 0x40);
307 /* And set graphics mode */
308 WREG_GFX(VGA_GFX_MISC, 0x01);
311 cirrus_crtc_do_set_base(crtc, old_fb, x, y, 0);
313 /* Unblank (needed on S3 resume, vgabios doesn't do it then) */
319 * This is called before a mode is programmed. A typical use might be to
320 * enable DPMS during the programming to avoid seeing intermediate stages,
321 * but that's not relevant to us
323 static void cirrus_crtc_prepare(struct drm_crtc *crtc)
328 * This is called after a mode is programmed. It should reverse anything done
329 * by the prepare function
331 static void cirrus_crtc_commit(struct drm_crtc *crtc)
336 * The core can pass us a set of gamma values to program. We actually only
337 * use this for 8-bit mode so can't perform smooth fades on deeper modes,
338 * but it's a requirement that we provide the function
340 static void cirrus_crtc_gamma_set(struct drm_crtc *crtc, u16 *red, u16 *green,
341 u16 *blue, uint32_t start, uint32_t size)
343 struct cirrus_crtc *cirrus_crtc = to_cirrus_crtc(crtc);
346 if (size != CIRRUS_LUT_SIZE)
349 for (i = 0; i < CIRRUS_LUT_SIZE; i++) {
350 cirrus_crtc->lut_r[i] = red[i];
351 cirrus_crtc->lut_g[i] = green[i];
352 cirrus_crtc->lut_b[i] = blue[i];
354 cirrus_crtc_load_lut(crtc);
357 /* Simple cleanup function */
358 static void cirrus_crtc_destroy(struct drm_crtc *crtc)
360 struct cirrus_crtc *cirrus_crtc = to_cirrus_crtc(crtc);
362 drm_crtc_cleanup(crtc);
366 /* These provide the minimum set of functions required to handle a CRTC */
367 static const struct drm_crtc_funcs cirrus_crtc_funcs = {
368 .gamma_set = cirrus_crtc_gamma_set,
369 .set_config = drm_crtc_helper_set_config,
370 .destroy = cirrus_crtc_destroy,
373 static const struct drm_crtc_helper_funcs cirrus_helper_funcs = {
374 .dpms = cirrus_crtc_dpms,
375 .mode_fixup = cirrus_crtc_mode_fixup,
376 .mode_set = cirrus_crtc_mode_set,
377 .mode_set_base = cirrus_crtc_mode_set_base,
378 .prepare = cirrus_crtc_prepare,
379 .commit = cirrus_crtc_commit,
380 .load_lut = cirrus_crtc_load_lut,
384 static void cirrus_crtc_init(struct drm_device *dev)
386 struct cirrus_device *cdev = dev->dev_private;
387 struct cirrus_crtc *cirrus_crtc;
390 cirrus_crtc = kzalloc(sizeof(struct cirrus_crtc) +
391 (CIRRUSFB_CONN_LIMIT * sizeof(struct drm_connector *)),
394 if (cirrus_crtc == NULL)
397 drm_crtc_init(dev, &cirrus_crtc->base, &cirrus_crtc_funcs);
399 drm_mode_crtc_set_gamma_size(&cirrus_crtc->base, CIRRUS_LUT_SIZE);
400 cdev->mode_info.crtc = cirrus_crtc;
402 for (i = 0; i < CIRRUS_LUT_SIZE; i++) {
403 cirrus_crtc->lut_r[i] = i;
404 cirrus_crtc->lut_g[i] = i;
405 cirrus_crtc->lut_b[i] = i;
408 drm_crtc_helper_add(&cirrus_crtc->base, &cirrus_helper_funcs);
411 /** Sets the color ramps on behalf of fbcon */
412 void cirrus_crtc_fb_gamma_set(struct drm_crtc *crtc, u16 red, u16 green,
415 struct cirrus_crtc *cirrus_crtc = to_cirrus_crtc(crtc);
417 cirrus_crtc->lut_r[regno] = red;
418 cirrus_crtc->lut_g[regno] = green;
419 cirrus_crtc->lut_b[regno] = blue;
422 /** Gets the color ramps on behalf of fbcon */
423 void cirrus_crtc_fb_gamma_get(struct drm_crtc *crtc, u16 *red, u16 *green,
424 u16 *blue, int regno)
426 struct cirrus_crtc *cirrus_crtc = to_cirrus_crtc(crtc);
428 *red = cirrus_crtc->lut_r[regno];
429 *green = cirrus_crtc->lut_g[regno];
430 *blue = cirrus_crtc->lut_b[regno];
434 static bool cirrus_encoder_mode_fixup(struct drm_encoder *encoder,
435 const struct drm_display_mode *mode,
436 struct drm_display_mode *adjusted_mode)
441 static void cirrus_encoder_mode_set(struct drm_encoder *encoder,
442 struct drm_display_mode *mode,
443 struct drm_display_mode *adjusted_mode)
447 static void cirrus_encoder_dpms(struct drm_encoder *encoder, int state)
452 static void cirrus_encoder_prepare(struct drm_encoder *encoder)
456 static void cirrus_encoder_commit(struct drm_encoder *encoder)
460 static void cirrus_encoder_destroy(struct drm_encoder *encoder)
462 struct cirrus_encoder *cirrus_encoder = to_cirrus_encoder(encoder);
463 drm_encoder_cleanup(encoder);
464 kfree(cirrus_encoder);
467 static const struct drm_encoder_helper_funcs cirrus_encoder_helper_funcs = {
468 .dpms = cirrus_encoder_dpms,
469 .mode_fixup = cirrus_encoder_mode_fixup,
470 .mode_set = cirrus_encoder_mode_set,
471 .prepare = cirrus_encoder_prepare,
472 .commit = cirrus_encoder_commit,
475 static const struct drm_encoder_funcs cirrus_encoder_encoder_funcs = {
476 .destroy = cirrus_encoder_destroy,
479 static struct drm_encoder *cirrus_encoder_init(struct drm_device *dev)
481 struct drm_encoder *encoder;
482 struct cirrus_encoder *cirrus_encoder;
484 cirrus_encoder = kzalloc(sizeof(struct cirrus_encoder), GFP_KERNEL);
488 encoder = &cirrus_encoder->base;
489 encoder->possible_crtcs = 0x1;
491 drm_encoder_init(dev, encoder, &cirrus_encoder_encoder_funcs,
492 DRM_MODE_ENCODER_DAC);
493 drm_encoder_helper_add(encoder, &cirrus_encoder_helper_funcs);
499 static int cirrus_vga_get_modes(struct drm_connector *connector)
503 /* Just add a static list of modes */
504 if (cirrus_bpp <= 24) {
505 count = drm_add_modes_noedid(connector, 1280, 1024);
506 drm_set_preferred_mode(connector, 1024, 768);
508 count = drm_add_modes_noedid(connector, 800, 600);
509 drm_set_preferred_mode(connector, 800, 600);
514 static struct drm_encoder *cirrus_connector_best_encoder(struct drm_connector
517 int enc_id = connector->encoder_ids[0];
518 /* pick the encoder ids */
520 return drm_encoder_find(connector->dev, enc_id);
524 static enum drm_connector_status cirrus_vga_detect(struct drm_connector
525 *connector, bool force)
527 return connector_status_connected;
530 static void cirrus_connector_destroy(struct drm_connector *connector)
532 drm_connector_cleanup(connector);
536 struct drm_connector_helper_funcs cirrus_vga_connector_helper_funcs = {
537 .get_modes = cirrus_vga_get_modes,
538 .best_encoder = cirrus_connector_best_encoder,
541 struct drm_connector_funcs cirrus_vga_connector_funcs = {
542 .dpms = drm_helper_connector_dpms,
543 .detect = cirrus_vga_detect,
544 .fill_modes = drm_helper_probe_single_connector_modes,
545 .destroy = cirrus_connector_destroy,
548 static struct drm_connector *cirrus_vga_init(struct drm_device *dev)
550 struct drm_connector *connector;
551 struct cirrus_connector *cirrus_connector;
553 cirrus_connector = kzalloc(sizeof(struct cirrus_connector), GFP_KERNEL);
554 if (!cirrus_connector)
557 connector = &cirrus_connector->base;
559 drm_connector_init(dev, connector,
560 &cirrus_vga_connector_funcs, DRM_MODE_CONNECTOR_VGA);
562 drm_connector_helper_add(connector, &cirrus_vga_connector_helper_funcs);
564 drm_connector_register(connector);
569 int cirrus_modeset_init(struct cirrus_device *cdev)
571 struct drm_encoder *encoder;
572 struct drm_connector *connector;
575 drm_mode_config_init(cdev->dev);
576 cdev->mode_info.mode_config_initialized = true;
578 cdev->dev->mode_config.max_width = CIRRUS_MAX_FB_WIDTH;
579 cdev->dev->mode_config.max_height = CIRRUS_MAX_FB_HEIGHT;
581 cdev->dev->mode_config.fb_base = cdev->mc.vram_base;
582 cdev->dev->mode_config.preferred_depth = 24;
583 /* don't prefer a shadow on virt GPU */
584 cdev->dev->mode_config.prefer_shadow = 0;
586 cirrus_crtc_init(cdev->dev);
588 encoder = cirrus_encoder_init(cdev->dev);
590 DRM_ERROR("cirrus_encoder_init failed\n");
594 connector = cirrus_vga_init(cdev->dev);
596 DRM_ERROR("cirrus_vga_init failed\n");
600 drm_mode_connector_attach_encoder(connector, encoder);
602 ret = cirrus_fbdev_init(cdev);
604 DRM_ERROR("cirrus_fbdev_init failed\n");
611 void cirrus_modeset_fini(struct cirrus_device *cdev)
613 cirrus_fbdev_fini(cdev);
615 if (cdev->mode_info.mode_config_initialized) {
616 drm_mode_config_cleanup(cdev->dev);
617 cdev->mode_info.mode_config_initialized = false;