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Get rid of 'remove_new' relic from platform driver struct
[linux.git] / drivers / gpu / drm / tiny / ofdrm.c
blob9898eab5e9e2c583a13a8e4f493b9dc46e08828e
1 // SPDX-License-Identifier: GPL-2.0-only
2
3 #include <linux/aperture.h>
4 #include <linux/of_address.h>
5 #include <linux/pci.h>
6 #include <linux/platform_device.h>
7
8 #include <drm/drm_atomic.h>
9 #include <drm/drm_atomic_state_helper.h>
10 #include <drm/drm_client_setup.h>
11 #include <drm/drm_connector.h>
12 #include <drm/drm_damage_helper.h>
13 #include <drm/drm_device.h>
14 #include <drm/drm_drv.h>
15 #include <drm/drm_fbdev_shmem.h>
16 #include <drm/drm_format_helper.h>
17 #include <drm/drm_framebuffer.h>
18 #include <drm/drm_gem_atomic_helper.h>
19 #include <drm/drm_gem_framebuffer_helper.h>
20 #include <drm/drm_gem_shmem_helper.h>
21 #include <drm/drm_managed.h>
22 #include <drm/drm_modeset_helper_vtables.h>
23 #include <drm/drm_probe_helper.h>
24 #include <drm/drm_simple_kms_helper.h>
25
26 #define DRIVER_NAME "ofdrm"
27 #define DRIVER_DESC "DRM driver for OF platform devices"
28 #define DRIVER_DATE "20220501"
29 #define DRIVER_MAJOR 1
30 #define DRIVER_MINOR 0
31
32 #define PCI_VENDOR_ID_ATI_R520 0x7100
33 #define PCI_VENDOR_ID_ATI_R600 0x9400
34
35 #define OFDRM_GAMMA_LUT_SIZE 256
36
37 /* Definitions used by the Avivo palette */
38 #define AVIVO_DC_LUT_RW_SELECT 0x6480
39 #define AVIVO_DC_LUT_RW_MODE 0x6484
40 #define AVIVO_DC_LUT_RW_INDEX 0x6488
41 #define AVIVO_DC_LUT_SEQ_COLOR 0x648c
42 #define AVIVO_DC_LUT_PWL_DATA 0x6490
43 #define AVIVO_DC_LUT_30_COLOR 0x6494
44 #define AVIVO_DC_LUT_READ_PIPE_SELECT 0x6498
45 #define AVIVO_DC_LUT_WRITE_EN_MASK 0x649c
46 #define AVIVO_DC_LUT_AUTOFILL 0x64a0
47 #define AVIVO_DC_LUTA_CONTROL 0x64c0
48 #define AVIVO_DC_LUTA_BLACK_OFFSET_BLUE 0x64c4
49 #define AVIVO_DC_LUTA_BLACK_OFFSET_GREEN 0x64c8
50 #define AVIVO_DC_LUTA_BLACK_OFFSET_RED 0x64cc
51 #define AVIVO_DC_LUTA_WHITE_OFFSET_BLUE 0x64d0
52 #define AVIVO_DC_LUTA_WHITE_OFFSET_GREEN 0x64d4
53 #define AVIVO_DC_LUTA_WHITE_OFFSET_RED 0x64d8
54 #define AVIVO_DC_LUTB_CONTROL 0x6cc0
55 #define AVIVO_DC_LUTB_BLACK_OFFSET_BLUE 0x6cc4
56 #define AVIVO_DC_LUTB_BLACK_OFFSET_GREEN 0x6cc8
57 #define AVIVO_DC_LUTB_BLACK_OFFSET_RED 0x6ccc
58 #define AVIVO_DC_LUTB_WHITE_OFFSET_BLUE 0x6cd0
59 #define AVIVO_DC_LUTB_WHITE_OFFSET_GREEN 0x6cd4
60 #define AVIVO_DC_LUTB_WHITE_OFFSET_RED 0x6cd8
61
62 enum ofdrm_model {
63 OFDRM_MODEL_UNKNOWN,
64 OFDRM_MODEL_MACH64, /* ATI Mach64 */
65 OFDRM_MODEL_RAGE128, /* ATI Rage128 */
66 OFDRM_MODEL_RAGE_M3A, /* ATI Rage Mobility M3 Head A */
67 OFDRM_MODEL_RAGE_M3B, /* ATI Rage Mobility M3 Head B */
68 OFDRM_MODEL_RADEON, /* ATI Radeon */
69 OFDRM_MODEL_GXT2000, /* IBM GXT2000 */
70 OFDRM_MODEL_AVIVO, /* ATI R5xx */
71 OFDRM_MODEL_QEMU, /* QEMU VGA */
72 };
73
74 /*
75 * Helpers for display nodes
76 */
77
78 static int display_get_validated_int(struct drm_device *dev, const char *name, uint32_t value)
79 {
80 if (value > INT_MAX) {
81 drm_err(dev, "invalid framebuffer %s of %u\n", name, value);
82 return -EINVAL;
83 }
84 return (int)value;
85 }
86
87 static int display_get_validated_int0(struct drm_device *dev, const char *name, uint32_t value)
88 {
89 if (!value) {
90 drm_err(dev, "invalid framebuffer %s of %u\n", name, value);
91 return -EINVAL;
92 }
93 return display_get_validated_int(dev, name, value);
94 }
95
96 static const struct drm_format_info *display_get_validated_format(struct drm_device *dev,
97 u32 depth, bool big_endian)
98 {
99 const struct drm_format_info *info;
100 u32 format;
101
102 switch (depth) {
103 case 8:
104 format = drm_mode_legacy_fb_format(8, 8);
105 break;
106 case 15:
107 case 16:
108 format = drm_mode_legacy_fb_format(16, depth);
109 break;
110 case 32:
111 format = drm_mode_legacy_fb_format(32, 24);
112 break;
113 default:
114 drm_err(dev, "unsupported framebuffer depth %u\n", depth);
115 return ERR_PTR(-EINVAL);
116 }
117
118 /*
119 * DRM formats assume little-endian byte order. Update the format
120 * if the scanout buffer uses big-endian ordering.
121 */
122 if (big_endian) {
123 switch (format) {
124 case DRM_FORMAT_XRGB8888:
125 format = DRM_FORMAT_BGRX8888;
126 break;
127 case DRM_FORMAT_ARGB8888:
128 format = DRM_FORMAT_BGRA8888;
129 break;
130 case DRM_FORMAT_RGB565:
131 format = DRM_FORMAT_RGB565 | DRM_FORMAT_BIG_ENDIAN;
132 break;
133 case DRM_FORMAT_XRGB1555:
134 format = DRM_FORMAT_XRGB1555 | DRM_FORMAT_BIG_ENDIAN;
135 break;
136 default:
137 break;
138 }
139 }
140
141 info = drm_format_info(format);
142 if (!info) {
143 drm_err(dev, "cannot find framebuffer format for depth %u\n", depth);
144 return ERR_PTR(-EINVAL);
145 }
146
147 return info;
148 }
149
150 static int display_read_u32_of(struct drm_device *dev, struct device_node *of_node,
151 const char *name, u32 *value)
152 {
153 int ret = of_property_read_u32(of_node, name, value);
154
155 if (ret)
156 drm_err(dev, "cannot parse framebuffer %s: error %d\n", name, ret);
157 return ret;
158 }
159
160 static bool display_get_big_endian_of(struct drm_device *dev, struct device_node *of_node)
161 {
162 bool big_endian;
163
164 #ifdef __BIG_ENDIAN
165 big_endian = !of_property_read_bool(of_node, "little-endian");
166 #else
167 big_endian = of_property_read_bool(of_node, "big-endian");
168 #endif
169
170 return big_endian;
171 }
172
173 static int display_get_width_of(struct drm_device *dev, struct device_node *of_node)
174 {
175 u32 width;
176 int ret = display_read_u32_of(dev, of_node, "width", &width);
177
178 if (ret)
179 return ret;
180 return display_get_validated_int0(dev, "width", width);
181 }
182
183 static int display_get_height_of(struct drm_device *dev, struct device_node *of_node)
184 {
185 u32 height;
186 int ret = display_read_u32_of(dev, of_node, "height", &height);
187
188 if (ret)
189 return ret;
190 return display_get_validated_int0(dev, "height", height);
191 }
192
193 static int display_get_depth_of(struct drm_device *dev, struct device_node *of_node)
194 {
195 u32 depth;
196 int ret = display_read_u32_of(dev, of_node, "depth", &depth);
197
198 if (ret)
199 return ret;
200 return display_get_validated_int0(dev, "depth", depth);
201 }
202
203 static int display_get_linebytes_of(struct drm_device *dev, struct device_node *of_node)
204 {
205 u32 linebytes;
206 int ret = display_read_u32_of(dev, of_node, "linebytes", &linebytes);
207
208 if (ret)
209 return ret;
210 return display_get_validated_int(dev, "linebytes", linebytes);
211 }
212
213 static u64 display_get_address_of(struct drm_device *dev, struct device_node *of_node)
214 {
215 u32 address;
216 int ret;
217
218 /*
219 * Not all devices provide an address property, it's not
220 * a bug if this fails. The driver will try to find the
221 * framebuffer base address from the device's memory regions.
222 */
223 ret = of_property_read_u32(of_node, "address", &address);
224 if (ret)
225 return OF_BAD_ADDR;
226
227 return address;
228 }
229
230 static bool is_avivo(u32 vendor, u32 device)
231 {
232 /* This will match most R5xx */
233 return (vendor == PCI_VENDOR_ID_ATI) &&
234 ((device >= PCI_VENDOR_ID_ATI_R520 && device < 0x7800) ||
235 (PCI_VENDOR_ID_ATI_R600 >= 0x9400));
236 }
237
238 static enum ofdrm_model display_get_model_of(struct drm_device *dev, struct device_node *of_node)
239 {
240 enum ofdrm_model model = OFDRM_MODEL_UNKNOWN;
241
242 if (of_node_name_prefix(of_node, "ATY,Rage128")) {
243 model = OFDRM_MODEL_RAGE128;
244 } else if (of_node_name_prefix(of_node, "ATY,RageM3pA") ||
245 of_node_name_prefix(of_node, "ATY,RageM3p12A")) {
246 model = OFDRM_MODEL_RAGE_M3A;
247 } else if (of_node_name_prefix(of_node, "ATY,RageM3pB")) {
248 model = OFDRM_MODEL_RAGE_M3B;
249 } else if (of_node_name_prefix(of_node, "ATY,Rage6")) {
250 model = OFDRM_MODEL_RADEON;
251 } else if (of_node_name_prefix(of_node, "ATY,")) {
252 return OFDRM_MODEL_MACH64;
253 } else if (of_device_is_compatible(of_node, "pci1014,b7") ||
254 of_device_is_compatible(of_node, "pci1014,21c")) {
255 model = OFDRM_MODEL_GXT2000;
256 } else if (of_node_name_prefix(of_node, "vga,Display-")) {
257 struct device_node *of_parent;
258 const __be32 *vendor_p, *device_p;
259
260 /* Look for AVIVO initialized by SLOF */
261 of_parent = of_get_parent(of_node);
262 vendor_p = of_get_property(of_parent, "vendor-id", NULL);
263 device_p = of_get_property(of_parent, "device-id", NULL);
264 if (vendor_p && device_p) {
265 u32 vendor = be32_to_cpup(vendor_p);
266 u32 device = be32_to_cpup(device_p);
267
268 if (is_avivo(vendor, device))
269 model = OFDRM_MODEL_AVIVO;
270 }
271 of_node_put(of_parent);
272 } else if (of_device_is_compatible(of_node, "qemu,std-vga")) {
273 model = OFDRM_MODEL_QEMU;
274 }
275
276 return model;
277 }
278
279 /*
280 * Open Firmware display device
281 */
282
283 struct ofdrm_device;
284
285 struct ofdrm_device_funcs {
286 void __iomem *(*cmap_ioremap)(struct ofdrm_device *odev,
287 struct device_node *of_node,
288 u64 fb_bas);
289 void (*cmap_write)(struct ofdrm_device *odev, unsigned char index,
290 unsigned char r, unsigned char g, unsigned char b);
291 };
292
293 struct ofdrm_device {
294 struct drm_device dev;
295 struct platform_device *pdev;
296
297 const struct ofdrm_device_funcs *funcs;
298
299 /* firmware-buffer settings */
300 struct iosys_map screen_base;
301 struct drm_display_mode mode;
302 const struct drm_format_info *format;
303 unsigned int pitch;
304
305 /* colormap */
306 void __iomem *cmap_base;
307
308 /* modesetting */
309 uint32_t formats[8];
310 struct drm_plane primary_plane;
311 struct drm_crtc crtc;
312 struct drm_encoder encoder;
313 struct drm_connector connector;
314 };
315
316 static struct ofdrm_device *ofdrm_device_of_dev(struct drm_device *dev)
317 {
318 return container_of(dev, struct ofdrm_device, dev);
319 }
320
321 /*
322 * Hardware
323 */
324
325 #if defined(CONFIG_PCI)
326 static struct pci_dev *display_get_pci_dev_of(struct drm_device *dev, struct device_node *of_node)
327 {
328 const __be32 *vendor_p, *device_p;
329 u32 vendor, device;
330 struct pci_dev *pcidev;
331
332 vendor_p = of_get_property(of_node, "vendor-id", NULL);
333 if (!vendor_p)
334 return ERR_PTR(-ENODEV);
335 vendor = be32_to_cpup(vendor_p);
336
337 device_p = of_get_property(of_node, "device-id", NULL);
338 if (!device_p)
339 return ERR_PTR(-ENODEV);
340 device = be32_to_cpup(device_p);
341
342 pcidev = pci_get_device(vendor, device, NULL);
343 if (!pcidev)
344 return ERR_PTR(-ENODEV);
345
346 return pcidev;
347 }
348
349 static void ofdrm_pci_release(void *data)
350 {
351 struct pci_dev *pcidev = data;
352
353 pci_disable_device(pcidev);
354 }
355
356 static int ofdrm_device_init_pci(struct ofdrm_device *odev)
357 {
358 struct drm_device *dev = &odev->dev;
359 struct platform_device *pdev = to_platform_device(dev->dev);
360 struct device_node *of_node = pdev->dev.of_node;
361 struct pci_dev *pcidev;
362 int ret;
363
364 /*
365 * Never use pcim_ or other managed helpers on the returned PCI
366 * device. Otherwise, probing the native driver will fail for
367 * resource conflicts. PCI-device management has to be tied to
368 * the lifetime of the platform device until the native driver
369 * takes over.
370 */
371 pcidev = display_get_pci_dev_of(dev, of_node);
372 if (IS_ERR(pcidev))
373 return 0; /* no PCI device found; ignore the error */
374
375 ret = pci_enable_device(pcidev);
376 if (ret) {
377 drm_err(dev, "pci_enable_device(%s) failed: %d\n",
378 dev_name(&pcidev->dev), ret);
379 return ret;
380 }
381 ret = devm_add_action_or_reset(&pdev->dev, ofdrm_pci_release, pcidev);
382 if (ret)
383 return ret;
384
385 return 0;
386 }
387 #else
388 static int ofdrm_device_init_pci(struct ofdrm_device *odev)
389 {
390 return 0;
391 }
392 #endif
393
394 /*
395 * OF display settings
396 */
397
398 static struct resource *ofdrm_find_fb_resource(struct ofdrm_device *odev,
399 struct resource *fb_res)
400 {
401 struct platform_device *pdev = to_platform_device(odev->dev.dev);
402 struct resource *res, *max_res = NULL;
403 u32 i;
404
405 for (i = 0; pdev->num_resources; ++i) {
406 res = platform_get_resource(pdev, IORESOURCE_MEM, i);
407 if (!res)
408 break; /* all resources processed */
409 if (resource_size(res) < resource_size(fb_res))
410 continue; /* resource too small */
411 if (fb_res->start && resource_contains(res, fb_res))
412 return res; /* resource contains framebuffer */
413 if (!max_res || resource_size(res) > resource_size(max_res))
414 max_res = res; /* store largest resource as fallback */
415 }
416
417 return max_res;
418 }
419
420 /*
421 * Colormap / Palette
422 */
423
424 static void __iomem *get_cmap_address_of(struct ofdrm_device *odev, struct device_node *of_node,
425 int bar_no, unsigned long offset, unsigned long size)
426 {
427 struct drm_device *dev = &odev->dev;
428 const __be32 *addr_p;
429 u64 max_size, address;
430 unsigned int flags;
431 void __iomem *mem;
432
433 addr_p = of_get_pci_address(of_node, bar_no, &max_size, &flags);
434 if (!addr_p)
435 addr_p = of_get_address(of_node, bar_no, &max_size, &flags);
436 if (!addr_p)
437 return IOMEM_ERR_PTR(-ENODEV);
438
439 if ((flags & (IORESOURCE_IO | IORESOURCE_MEM)) == 0)
440 return IOMEM_ERR_PTR(-ENODEV);
441
442 if ((offset + size) >= max_size)
443 return IOMEM_ERR_PTR(-ENODEV);
444
445 address = of_translate_address(of_node, addr_p);
446 if (address == OF_BAD_ADDR)
447 return IOMEM_ERR_PTR(-ENODEV);
448
449 mem = devm_ioremap(dev->dev, address + offset, size);
450 if (!mem)
451 return IOMEM_ERR_PTR(-ENOMEM);
452
453 return mem;
454 }
455
456 static void __iomem *ofdrm_mach64_cmap_ioremap(struct ofdrm_device *odev,
457 struct device_node *of_node,
458 u64 fb_base)
459 {
460 struct drm_device *dev = &odev->dev;
461 u64 address;
462 void __iomem *cmap_base;
463
464 address = fb_base & 0xff000000ul;
465 address += 0x7ff000;
466
467 cmap_base = devm_ioremap(dev->dev, address, 0x1000);
468 if (!cmap_base)
469 return IOMEM_ERR_PTR(-ENOMEM);
470
471 return cmap_base;
472 }
473
474 static void ofdrm_mach64_cmap_write(struct ofdrm_device *odev, unsigned char index,
475 unsigned char r, unsigned char g, unsigned char b)
476 {
477 void __iomem *addr = odev->cmap_base + 0xcc0;
478 void __iomem *data = odev->cmap_base + 0xcc0 + 1;
479
480 writeb(index, addr);
481 writeb(r, data);
482 writeb(g, data);
483 writeb(b, data);
484 }
485
486 static void __iomem *ofdrm_rage128_cmap_ioremap(struct ofdrm_device *odev,
487 struct device_node *of_node,
488 u64 fb_base)
489 {
490 return get_cmap_address_of(odev, of_node, 2, 0, 0x1fff);
491 }
492
493 static void ofdrm_rage128_cmap_write(struct ofdrm_device *odev, unsigned char index,
494 unsigned char r, unsigned char g, unsigned char b)
495 {
496 void __iomem *addr = odev->cmap_base + 0xb0;
497 void __iomem *data = odev->cmap_base + 0xb4;
498 u32 color = (r << 16) | (g << 8) | b;
499
500 writeb(index, addr);
501 writel(color, data);
502 }
503
504 static void __iomem *ofdrm_rage_m3a_cmap_ioremap(struct ofdrm_device *odev,
505 struct device_node *of_node,
506 u64 fb_base)
507 {
508 return get_cmap_address_of(odev, of_node, 2, 0, 0x1fff);
509 }
510
511 static void ofdrm_rage_m3a_cmap_write(struct ofdrm_device *odev, unsigned char index,
512 unsigned char r, unsigned char g, unsigned char b)
513 {
514 void __iomem *dac_ctl = odev->cmap_base + 0x58;
515 void __iomem *addr = odev->cmap_base + 0xb0;
516 void __iomem *data = odev->cmap_base + 0xb4;
517 u32 color = (r << 16) | (g << 8) | b;
518 u32 val;
519
520 /* Clear PALETTE_ACCESS_CNTL in DAC_CNTL */
521 val = readl(dac_ctl);
522 val &= ~0x20;
523 writel(val, dac_ctl);
524
525 /* Set color at palette index */
526 writeb(index, addr);
527 writel(color, data);
528 }
529
530 static void __iomem *ofdrm_rage_m3b_cmap_ioremap(struct ofdrm_device *odev,
531 struct device_node *of_node,
532 u64 fb_base)
533 {
534 return get_cmap_address_of(odev, of_node, 2, 0, 0x1fff);
535 }
536
537 static void ofdrm_rage_m3b_cmap_write(struct ofdrm_device *odev, unsigned char index,
538 unsigned char r, unsigned char g, unsigned char b)
539 {
540 void __iomem *dac_ctl = odev->cmap_base + 0x58;
541 void __iomem *addr = odev->cmap_base + 0xb0;
542 void __iomem *data = odev->cmap_base + 0xb4;
543 u32 color = (r << 16) | (g << 8) | b;
544 u32 val;
545
546 /* Set PALETTE_ACCESS_CNTL in DAC_CNTL */
547 val = readl(dac_ctl);
548 val |= 0x20;
549 writel(val, dac_ctl);
550
551 /* Set color at palette index */
552 writeb(index, addr);
553 writel(color, data);
554 }
555
556 static void __iomem *ofdrm_radeon_cmap_ioremap(struct ofdrm_device *odev,
557 struct device_node *of_node,
558 u64 fb_base)
559 {
560 return get_cmap_address_of(odev, of_node, 1, 0, 0x1fff);
561 }
562
563 static void __iomem *ofdrm_gxt2000_cmap_ioremap(struct ofdrm_device *odev,
564 struct device_node *of_node,
565 u64 fb_base)
566 {
567 return get_cmap_address_of(odev, of_node, 0, 0x6000, 0x1000);
568 }
569
570 static void ofdrm_gxt2000_cmap_write(struct ofdrm_device *odev, unsigned char index,
571 unsigned char r, unsigned char g, unsigned char b)
572 {
573 void __iomem *data = ((unsigned int __iomem *)odev->cmap_base) + index;
574 u32 color = (r << 16) | (g << 8) | b;
575
576 writel(color, data);
577 }
578
579 static void __iomem *ofdrm_avivo_cmap_ioremap(struct ofdrm_device *odev,
580 struct device_node *of_node,
581 u64 fb_base)
582 {
583 struct device_node *of_parent;
584 void __iomem *cmap_base;
585
586 of_parent = of_get_parent(of_node);
587 cmap_base = get_cmap_address_of(odev, of_parent, 0, 0, 0x10000);
588 of_node_put(of_parent);
589
590 return cmap_base;
591 }
592
593 static void ofdrm_avivo_cmap_write(struct ofdrm_device *odev, unsigned char index,
594 unsigned char r, unsigned char g, unsigned char b)
595 {
596 void __iomem *lutsel = odev->cmap_base + AVIVO_DC_LUT_RW_SELECT;
597 void __iomem *addr = odev->cmap_base + AVIVO_DC_LUT_RW_INDEX;
598 void __iomem *data = odev->cmap_base + AVIVO_DC_LUT_30_COLOR;
599 u32 color = (r << 22) | (g << 12) | (b << 2);
600
601 /* Write to both LUTs for now */
602
603 writel(1, lutsel);
604 writeb(index, addr);
605 writel(color, data);
606
607 writel(0, lutsel);
608 writeb(index, addr);
609 writel(color, data);
610 }
611
612 static void __iomem *ofdrm_qemu_cmap_ioremap(struct ofdrm_device *odev,
613 struct device_node *of_node,
614 u64 fb_base)
615 {
616 static const __be32 io_of_addr[3] = {
617 cpu_to_be32(0x01000000),
618 cpu_to_be32(0x00),
619 cpu_to_be32(0x00),
620 };
621
622 struct drm_device *dev = &odev->dev;
623 u64 address;
624 void __iomem *cmap_base;
625
626 address = of_translate_address(of_node, io_of_addr);
627 if (address == OF_BAD_ADDR)
628 return IOMEM_ERR_PTR(-ENODEV);
629
630 cmap_base = devm_ioremap(dev->dev, address + 0x3c8, 2);
631 if (!cmap_base)
632 return IOMEM_ERR_PTR(-ENOMEM);
633
634 return cmap_base;
635 }
636
637 static void ofdrm_qemu_cmap_write(struct ofdrm_device *odev, unsigned char index,
638 unsigned char r, unsigned char g, unsigned char b)
639 {
640 void __iomem *addr = odev->cmap_base;
641 void __iomem *data = odev->cmap_base + 1;
642
643 writeb(index, addr);
644 writeb(r, data);
645 writeb(g, data);
646 writeb(b, data);
647 }
648
649 static void ofdrm_device_set_gamma_linear(struct ofdrm_device *odev,
650 const struct drm_format_info *format)
651 {
652 struct drm_device *dev = &odev->dev;
653 int i;
654
655 switch (format->format) {
656 case DRM_FORMAT_RGB565:
657 case DRM_FORMAT_RGB565 | DRM_FORMAT_BIG_ENDIAN:
658 /* Use better interpolation, to take 32 values from 0 to 255 */
659 for (i = 0; i < OFDRM_GAMMA_LUT_SIZE / 8; i++) {
660 unsigned char r = i * 8 + i / 4;
661 unsigned char g = i * 4 + i / 16;
662 unsigned char b = i * 8 + i / 4;
663
664 odev->funcs->cmap_write(odev, i, r, g, b);
665 }
666 /* Green has one more bit, so add padding with 0 for red and blue. */
667 for (i = OFDRM_GAMMA_LUT_SIZE / 8; i < OFDRM_GAMMA_LUT_SIZE / 4; i++) {
668 unsigned char r = 0;
669 unsigned char g = i * 4 + i / 16;
670 unsigned char b = 0;
671
672 odev->funcs->cmap_write(odev, i, r, g, b);
673 }
674 break;
675 case DRM_FORMAT_XRGB8888:
676 case DRM_FORMAT_BGRX8888:
677 for (i = 0; i < OFDRM_GAMMA_LUT_SIZE; i++)
678 odev->funcs->cmap_write(odev, i, i, i, i);
679 break;
680 default:
681 drm_warn_once(dev, "Unsupported format %p4cc for gamma correction\n",
682 &format->format);
683 break;
684 }
685 }
686
687 static void ofdrm_device_set_gamma(struct ofdrm_device *odev,
688 const struct drm_format_info *format,
689 struct drm_color_lut *lut)
690 {
691 struct drm_device *dev = &odev->dev;
692 int i;
693
694 switch (format->format) {
695 case DRM_FORMAT_RGB565:
696 case DRM_FORMAT_RGB565 | DRM_FORMAT_BIG_ENDIAN:
697 /* Use better interpolation, to take 32 values from lut[0] to lut[255] */
698 for (i = 0; i < OFDRM_GAMMA_LUT_SIZE / 8; i++) {
699 unsigned char r = lut[i * 8 + i / 4].red >> 8;
700 unsigned char g = lut[i * 4 + i / 16].green >> 8;
701 unsigned char b = lut[i * 8 + i / 4].blue >> 8;
702
703 odev->funcs->cmap_write(odev, i, r, g, b);
704 }
705 /* Green has one more bit, so add padding with 0 for red and blue. */
706 for (i = OFDRM_GAMMA_LUT_SIZE / 8; i < OFDRM_GAMMA_LUT_SIZE / 4; i++) {
707 unsigned char r = 0;
708 unsigned char g = lut[i * 4 + i / 16].green >> 8;
709 unsigned char b = 0;
710
711 odev->funcs->cmap_write(odev, i, r, g, b);
712 }
713 break;
714 case DRM_FORMAT_XRGB8888:
715 case DRM_FORMAT_BGRX8888:
716 for (i = 0; i < OFDRM_GAMMA_LUT_SIZE; i++) {
717 unsigned char r = lut[i].red >> 8;
718 unsigned char g = lut[i].green >> 8;
719 unsigned char b = lut[i].blue >> 8;
720
721 odev->funcs->cmap_write(odev, i, r, g, b);
722 }
723 break;
724 default:
725 drm_warn_once(dev, "Unsupported format %p4cc for gamma correction\n",
726 &format->format);
727 break;
728 }
729 }
730
731 /*
732 * Modesetting
733 */
734
735 struct ofdrm_crtc_state {
736 struct drm_crtc_state base;
737
738 /* Primary-plane format; required for color mgmt. */
739 const struct drm_format_info *format;
740 };
741
742 static struct ofdrm_crtc_state *to_ofdrm_crtc_state(struct drm_crtc_state *base)
743 {
744 return container_of(base, struct ofdrm_crtc_state, base);
745 }
746
747 static void ofdrm_crtc_state_destroy(struct ofdrm_crtc_state *ofdrm_crtc_state)
748 {
749 __drm_atomic_helper_crtc_destroy_state(&ofdrm_crtc_state->base);
750 kfree(ofdrm_crtc_state);
751 }
752
753 static const uint64_t ofdrm_primary_plane_format_modifiers[] = {
754 DRM_FORMAT_MOD_LINEAR,
755 DRM_FORMAT_MOD_INVALID
756 };
757
758 static int ofdrm_primary_plane_helper_atomic_check(struct drm_plane *plane,
759 struct drm_atomic_state *new_state)
760 {
761 struct drm_device *dev = plane->dev;
762 struct ofdrm_device *odev = ofdrm_device_of_dev(dev);
763 struct drm_plane_state *new_plane_state = drm_atomic_get_new_plane_state(new_state, plane);
764 struct drm_shadow_plane_state *new_shadow_plane_state =
765 to_drm_shadow_plane_state(new_plane_state);
766 struct drm_framebuffer *new_fb = new_plane_state->fb;
767 struct drm_crtc *new_crtc = new_plane_state->crtc;
768 struct drm_crtc_state *new_crtc_state = NULL;
769 struct ofdrm_crtc_state *new_ofdrm_crtc_state;
770 int ret;
771
772 if (new_crtc)
773 new_crtc_state = drm_atomic_get_new_crtc_state(new_state, new_plane_state->crtc);
774
775 ret = drm_atomic_helper_check_plane_state(new_plane_state, new_crtc_state,
776 DRM_PLANE_NO_SCALING,
777 DRM_PLANE_NO_SCALING,
778 false, false);
779 if (ret)
780 return ret;
781 else if (!new_plane_state->visible)
782 return 0;
783
784 if (new_fb->format != odev->format) {
785 void *buf;
786
787 /* format conversion necessary; reserve buffer */
788 buf = drm_format_conv_state_reserve(&new_shadow_plane_state->fmtcnv_state,
789 odev->pitch, GFP_KERNEL);
790 if (!buf)
791 return -ENOMEM;
792 }
793
794 new_crtc_state = drm_atomic_get_new_crtc_state(new_state, new_plane_state->crtc);
795
796 new_ofdrm_crtc_state = to_ofdrm_crtc_state(new_crtc_state);
797 new_ofdrm_crtc_state->format = new_fb->format;
798
799 return 0;
800 }
801
802 static void ofdrm_primary_plane_helper_atomic_update(struct drm_plane *plane,
803 struct drm_atomic_state *state)
804 {
805 struct drm_device *dev = plane->dev;
806 struct ofdrm_device *odev = ofdrm_device_of_dev(dev);
807 struct drm_plane_state *plane_state = drm_atomic_get_new_plane_state(state, plane);
808 struct drm_plane_state *old_plane_state = drm_atomic_get_old_plane_state(state, plane);
809 struct drm_shadow_plane_state *shadow_plane_state = to_drm_shadow_plane_state(plane_state);
810 struct drm_framebuffer *fb = plane_state->fb;
811 unsigned int dst_pitch = odev->pitch;
812 const struct drm_format_info *dst_format = odev->format;
813 struct drm_atomic_helper_damage_iter iter;
814 struct drm_rect damage;
815 int ret, idx;
816
817 ret = drm_gem_fb_begin_cpu_access(fb, DMA_FROM_DEVICE);
818 if (ret)
819 return;
820
821 if (!drm_dev_enter(dev, &idx))
822 goto out_drm_gem_fb_end_cpu_access;
823
824 drm_atomic_helper_damage_iter_init(&iter, old_plane_state, plane_state);
825 drm_atomic_for_each_plane_damage(&iter, &damage) {
826 struct iosys_map dst = odev->screen_base;
827 struct drm_rect dst_clip = plane_state->dst;
828
829 if (!drm_rect_intersect(&dst_clip, &damage))
830 continue;
831
832 iosys_map_incr(&dst, drm_fb_clip_offset(dst_pitch, dst_format, &dst_clip));
833 drm_fb_blit(&dst, &dst_pitch, dst_format->format, shadow_plane_state->data, fb,
834 &damage, &shadow_plane_state->fmtcnv_state);
835 }
836
837 drm_dev_exit(idx);
838 out_drm_gem_fb_end_cpu_access:
839 drm_gem_fb_end_cpu_access(fb, DMA_FROM_DEVICE);
840 }
841
842 static void ofdrm_primary_plane_helper_atomic_disable(struct drm_plane *plane,
843 struct drm_atomic_state *state)
844 {
845 struct drm_device *dev = plane->dev;
846 struct ofdrm_device *odev = ofdrm_device_of_dev(dev);
847 struct iosys_map dst = odev->screen_base;
848 struct drm_plane_state *plane_state = drm_atomic_get_new_plane_state(state, plane);
849 void __iomem *dst_vmap = dst.vaddr_iomem; /* TODO: Use mapping abstraction */
850 unsigned int dst_pitch = odev->pitch;
851 const struct drm_format_info *dst_format = odev->format;
852 struct drm_rect dst_clip;
853 unsigned long lines, linepixels, i;
854 int idx;
855
856 drm_rect_init(&dst_clip,
857 plane_state->src_x >> 16, plane_state->src_y >> 16,
858 plane_state->src_w >> 16, plane_state->src_h >> 16);
859
860 lines = drm_rect_height(&dst_clip);
861 linepixels = drm_rect_width(&dst_clip);
862
863 if (!drm_dev_enter(dev, &idx))
864 return;
865
866 /* Clear buffer to black if disabled */
867 dst_vmap += drm_fb_clip_offset(dst_pitch, dst_format, &dst_clip);
868 for (i = 0; i < lines; ++i) {
869 memset_io(dst_vmap, 0, linepixels * dst_format->cpp[0]);
870 dst_vmap += dst_pitch;
871 }
872
873 drm_dev_exit(idx);
874 }
875
876 static const struct drm_plane_helper_funcs ofdrm_primary_plane_helper_funcs = {
877 DRM_GEM_SHADOW_PLANE_HELPER_FUNCS,
878 .atomic_check = ofdrm_primary_plane_helper_atomic_check,
879 .atomic_update = ofdrm_primary_plane_helper_atomic_update,
880 .atomic_disable = ofdrm_primary_plane_helper_atomic_disable,
881 };
882
883 static const struct drm_plane_funcs ofdrm_primary_plane_funcs = {
884 .update_plane = drm_atomic_helper_update_plane,
885 .disable_plane = drm_atomic_helper_disable_plane,
886 .destroy = drm_plane_cleanup,
887 DRM_GEM_SHADOW_PLANE_FUNCS,
888 };
889
890 static enum drm_mode_status ofdrm_crtc_helper_mode_valid(struct drm_crtc *crtc,
891 const struct drm_display_mode *mode)
892 {
893 struct ofdrm_device *odev = ofdrm_device_of_dev(crtc->dev);
894
895 return drm_crtc_helper_mode_valid_fixed(crtc, mode, &odev->mode);
896 }
897
898 static int ofdrm_crtc_helper_atomic_check(struct drm_crtc *crtc,
899 struct drm_atomic_state *new_state)
900 {
901 static const size_t gamma_lut_length = OFDRM_GAMMA_LUT_SIZE * sizeof(struct drm_color_lut);
902
903 struct drm_device *dev = crtc->dev;
904 struct drm_crtc_state *new_crtc_state = drm_atomic_get_new_crtc_state(new_state, crtc);
905 int ret;
906
907 if (!new_crtc_state->enable)
908 return 0;
909
910 ret = drm_atomic_helper_check_crtc_primary_plane(new_crtc_state);
911 if (ret)
912 return ret;
913
914 if (new_crtc_state->color_mgmt_changed) {
915 struct drm_property_blob *gamma_lut = new_crtc_state->gamma_lut;
916
917 if (gamma_lut && (gamma_lut->length != gamma_lut_length)) {
918 drm_dbg(dev, "Incorrect gamma_lut length %zu\n", gamma_lut->length);
919 return -EINVAL;
920 }
921 }
922
923 return 0;
924 }
925
926 static void ofdrm_crtc_helper_atomic_flush(struct drm_crtc *crtc, struct drm_atomic_state *state)
927 {
928 struct ofdrm_device *odev = ofdrm_device_of_dev(crtc->dev);
929 struct drm_crtc_state *crtc_state = drm_atomic_get_new_crtc_state(state, crtc);
930 struct ofdrm_crtc_state *ofdrm_crtc_state = to_ofdrm_crtc_state(crtc_state);
931
932 if (crtc_state->enable && crtc_state->color_mgmt_changed) {
933 const struct drm_format_info *format = ofdrm_crtc_state->format;
934
935 if (crtc_state->gamma_lut)
936 ofdrm_device_set_gamma(odev, format, crtc_state->gamma_lut->data);
937 else
938 ofdrm_device_set_gamma_linear(odev, format);
939 }
940 }
941
942 /*
943 * The CRTC is always enabled. Screen updates are performed by
944 * the primary plane's atomic_update function. Disabling clears
945 * the screen in the primary plane's atomic_disable function.
946 */
947 static const struct drm_crtc_helper_funcs ofdrm_crtc_helper_funcs = {
948 .mode_valid = ofdrm_crtc_helper_mode_valid,
949 .atomic_check = ofdrm_crtc_helper_atomic_check,
950 .atomic_flush = ofdrm_crtc_helper_atomic_flush,
951 };
952
953 static void ofdrm_crtc_reset(struct drm_crtc *crtc)
954 {
955 struct ofdrm_crtc_state *ofdrm_crtc_state =
956 kzalloc(sizeof(*ofdrm_crtc_state), GFP_KERNEL);
957
958 if (crtc->state)
959 ofdrm_crtc_state_destroy(to_ofdrm_crtc_state(crtc->state));
960
961 if (ofdrm_crtc_state)
962 __drm_atomic_helper_crtc_reset(crtc, &ofdrm_crtc_state->base);
963 else
964 __drm_atomic_helper_crtc_reset(crtc, NULL);
965 }
966
967 static struct drm_crtc_state *ofdrm_crtc_atomic_duplicate_state(struct drm_crtc *crtc)
968 {
969 struct drm_device *dev = crtc->dev;
970 struct drm_crtc_state *crtc_state = crtc->state;
971 struct ofdrm_crtc_state *new_ofdrm_crtc_state;
972 struct ofdrm_crtc_state *ofdrm_crtc_state;
973
974 if (drm_WARN_ON(dev, !crtc_state))
975 return NULL;
976
977 new_ofdrm_crtc_state = kzalloc(sizeof(*new_ofdrm_crtc_state), GFP_KERNEL);
978 if (!new_ofdrm_crtc_state)
979 return NULL;
980
981 ofdrm_crtc_state = to_ofdrm_crtc_state(crtc_state);
982
983 __drm_atomic_helper_crtc_duplicate_state(crtc, &new_ofdrm_crtc_state->base);
984 new_ofdrm_crtc_state->format = ofdrm_crtc_state->format;
985
986 return &new_ofdrm_crtc_state->base;
987 }
988
989 static void ofdrm_crtc_atomic_destroy_state(struct drm_crtc *crtc,
990 struct drm_crtc_state *crtc_state)
991 {
992 ofdrm_crtc_state_destroy(to_ofdrm_crtc_state(crtc_state));
993 }
994
995 static const struct drm_crtc_funcs ofdrm_crtc_funcs = {
996 .reset = ofdrm_crtc_reset,
997 .destroy = drm_crtc_cleanup,
998 .set_config = drm_atomic_helper_set_config,
999 .page_flip = drm_atomic_helper_page_flip,
1000 .atomic_duplicate_state = ofdrm_crtc_atomic_duplicate_state,
1001 .atomic_destroy_state = ofdrm_crtc_atomic_destroy_state,
1002 };
1003
1004 static int ofdrm_connector_helper_get_modes(struct drm_connector *connector)
1005 {
1006 struct ofdrm_device *odev = ofdrm_device_of_dev(connector->dev);
1007
1008 return drm_connector_helper_get_modes_fixed(connector, &odev->mode);
1009 }
1010
1011 static const struct drm_connector_helper_funcs ofdrm_connector_helper_funcs = {
1012 .get_modes = ofdrm_connector_helper_get_modes,
1013 };
1014
1015 static const struct drm_connector_funcs ofdrm_connector_funcs = {
1016 .reset = drm_atomic_helper_connector_reset,
1017 .fill_modes = drm_helper_probe_single_connector_modes,
1018 .destroy = drm_connector_cleanup,
1019 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
1020 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
1021 };
1022
1023 static const struct drm_mode_config_funcs ofdrm_mode_config_funcs = {
1024 .fb_create = drm_gem_fb_create_with_dirty,
1025 .atomic_check = drm_atomic_helper_check,
1026 .atomic_commit = drm_atomic_helper_commit,
1027 };
1028
1029 /*
1030 * Init / Cleanup
1031 */
1032
1033 static const struct ofdrm_device_funcs ofdrm_unknown_device_funcs = {
1034 };
1035
1036 static const struct ofdrm_device_funcs ofdrm_mach64_device_funcs = {
1037 .cmap_ioremap = ofdrm_mach64_cmap_ioremap,
1038 .cmap_write = ofdrm_mach64_cmap_write,
1039 };
1040
1041 static const struct ofdrm_device_funcs ofdrm_rage128_device_funcs = {
1042 .cmap_ioremap = ofdrm_rage128_cmap_ioremap,
1043 .cmap_write = ofdrm_rage128_cmap_write,
1044 };
1045
1046 static const struct ofdrm_device_funcs ofdrm_rage_m3a_device_funcs = {
1047 .cmap_ioremap = ofdrm_rage_m3a_cmap_ioremap,
1048 .cmap_write = ofdrm_rage_m3a_cmap_write,
1049 };
1050
1051 static const struct ofdrm_device_funcs ofdrm_rage_m3b_device_funcs = {
1052 .cmap_ioremap = ofdrm_rage_m3b_cmap_ioremap,
1053 .cmap_write = ofdrm_rage_m3b_cmap_write,
1054 };
1055
1056 static const struct ofdrm_device_funcs ofdrm_radeon_device_funcs = {
1057 .cmap_ioremap = ofdrm_radeon_cmap_ioremap,
1058 .cmap_write = ofdrm_rage128_cmap_write, /* same as Rage128 */
1059 };
1060
1061 static const struct ofdrm_device_funcs ofdrm_gxt2000_device_funcs = {
1062 .cmap_ioremap = ofdrm_gxt2000_cmap_ioremap,
1063 .cmap_write = ofdrm_gxt2000_cmap_write,
1064 };
1065
1066 static const struct ofdrm_device_funcs ofdrm_avivo_device_funcs = {
1067 .cmap_ioremap = ofdrm_avivo_cmap_ioremap,
1068 .cmap_write = ofdrm_avivo_cmap_write,
1069 };
1070
1071 static const struct ofdrm_device_funcs ofdrm_qemu_device_funcs = {
1072 .cmap_ioremap = ofdrm_qemu_cmap_ioremap,
1073 .cmap_write = ofdrm_qemu_cmap_write,
1074 };
1075
1076 static struct drm_display_mode ofdrm_mode(unsigned int width, unsigned int height)
1077 {
1078 /*
1079 * Assume a monitor resolution of 96 dpi to
1080 * get a somewhat reasonable screen size.
1081 */
1082 const struct drm_display_mode mode = {
1083 DRM_MODE_INIT(60, width, height,
1084 DRM_MODE_RES_MM(width, 96ul),
1085 DRM_MODE_RES_MM(height, 96ul))
1086 };
1087
1088 return mode;
1089 }
1090
1091 static struct ofdrm_device *ofdrm_device_create(struct drm_driver *drv,
1092 struct platform_device *pdev)
1093 {
1094 struct device_node *of_node = pdev->dev.of_node;
1095 struct ofdrm_device *odev;
1096 struct drm_device *dev;
1097 enum ofdrm_model model;
1098 bool big_endian;
1099 int width, height, depth, linebytes;
1100 const struct drm_format_info *format;
1101 u64 address;
1102 resource_size_t fb_size, fb_base, fb_pgbase, fb_pgsize;
1103 struct resource *res, *mem;
1104 void __iomem *screen_base;
1105 struct drm_plane *primary_plane;
1106 struct drm_crtc *crtc;
1107 struct drm_encoder *encoder;
1108 struct drm_connector *connector;
1109 unsigned long max_width, max_height;
1110 size_t nformats;
1111 int ret;
1112
1113 odev = devm_drm_dev_alloc(&pdev->dev, drv, struct ofdrm_device, dev);
1114 if (IS_ERR(odev))
1115 return ERR_CAST(odev);
1116 dev = &odev->dev;
1117 platform_set_drvdata(pdev, dev);
1118
1119 ret = ofdrm_device_init_pci(odev);
1120 if (ret)
1121 return ERR_PTR(ret);
1122
1123 /*
1124 * OF display-node settings
1125 */
1126
1127 model = display_get_model_of(dev, of_node);
1128 drm_dbg(dev, "detected model %d\n", model);
1129
1130 switch (model) {
1131 case OFDRM_MODEL_UNKNOWN:
1132 odev->funcs = &ofdrm_unknown_device_funcs;
1133 break;
1134 case OFDRM_MODEL_MACH64:
1135 odev->funcs = &ofdrm_mach64_device_funcs;
1136 break;
1137 case OFDRM_MODEL_RAGE128:
1138 odev->funcs = &ofdrm_rage128_device_funcs;
1139 break;
1140 case OFDRM_MODEL_RAGE_M3A:
1141 odev->funcs = &ofdrm_rage_m3a_device_funcs;
1142 break;
1143 case OFDRM_MODEL_RAGE_M3B:
1144 odev->funcs = &ofdrm_rage_m3b_device_funcs;
1145 break;
1146 case OFDRM_MODEL_RADEON:
1147 odev->funcs = &ofdrm_radeon_device_funcs;
1148 break;
1149 case OFDRM_MODEL_GXT2000:
1150 odev->funcs = &ofdrm_gxt2000_device_funcs;
1151 break;
1152 case OFDRM_MODEL_AVIVO:
1153 odev->funcs = &ofdrm_avivo_device_funcs;
1154 break;
1155 case OFDRM_MODEL_QEMU:
1156 odev->funcs = &ofdrm_qemu_device_funcs;
1157 break;
1158 }
1159
1160 big_endian = display_get_big_endian_of(dev, of_node);
1161
1162 width = display_get_width_of(dev, of_node);
1163 if (width < 0)
1164 return ERR_PTR(width);
1165 height = display_get_height_of(dev, of_node);
1166 if (height < 0)
1167 return ERR_PTR(height);
1168 depth = display_get_depth_of(dev, of_node);
1169 if (depth < 0)
1170 return ERR_PTR(depth);
1171 linebytes = display_get_linebytes_of(dev, of_node);
1172 if (linebytes < 0)
1173 return ERR_PTR(linebytes);
1174
1175 format = display_get_validated_format(dev, depth, big_endian);
1176 if (IS_ERR(format))
1177 return ERR_CAST(format);
1178 if (!linebytes) {
1179 linebytes = drm_format_info_min_pitch(format, 0, width);
1180 if (drm_WARN_ON(dev, !linebytes))
1181 return ERR_PTR(-EINVAL);
1182 }
1183
1184 fb_size = linebytes * height;
1185
1186 /*
1187 * Try to figure out the address of the framebuffer. Unfortunately, Open
1188 * Firmware doesn't provide a standard way to do so. All we can do is a
1189 * dodgy heuristic that happens to work in practice.
1190 *
1191 * On most machines, the "address" property contains what we need, though
1192 * not on Matrox cards found in IBM machines. What appears to give good
1193 * results is to go through the PCI ranges and pick one that encloses the
1194 * "address" property. If none match, we pick the largest.
1195 */
1196 address = display_get_address_of(dev, of_node);
1197 if (address != OF_BAD_ADDR) {
1198 struct resource fb_res = DEFINE_RES_MEM(address, fb_size);
1199
1200 res = ofdrm_find_fb_resource(odev, &fb_res);
1201 if (!res)
1202 return ERR_PTR(-EINVAL);
1203 if (resource_contains(res, &fb_res))
1204 fb_base = address;
1205 else
1206 fb_base = res->start;
1207 } else {
1208 struct resource fb_res = DEFINE_RES_MEM(0u, fb_size);
1209
1210 res = ofdrm_find_fb_resource(odev, &fb_res);
1211 if (!res)
1212 return ERR_PTR(-EINVAL);
1213 fb_base = res->start;
1214 }
1215
1216 /*
1217 * I/O resources
1218 */
1219
1220 fb_pgbase = round_down(fb_base, PAGE_SIZE);
1221 fb_pgsize = fb_base - fb_pgbase + round_up(fb_size, PAGE_SIZE);
1222
1223 ret = devm_aperture_acquire_for_platform_device(pdev, fb_pgbase, fb_pgsize);
1224 if (ret) {
1225 drm_err(dev, "could not acquire memory range %pr: error %d\n", &res, ret);
1226 return ERR_PTR(ret);
1227 }
1228
1229 mem = devm_request_mem_region(&pdev->dev, fb_pgbase, fb_pgsize, drv->name);
1230 if (!mem) {
1231 drm_warn(dev, "could not acquire memory region %pr\n", &res);
1232 return ERR_PTR(-ENOMEM);
1233 }
1234
1235 screen_base = devm_ioremap(&pdev->dev, mem->start, resource_size(mem));
1236 if (!screen_base)
1237 return ERR_PTR(-ENOMEM);
1238
1239 if (odev->funcs->cmap_ioremap) {
1240 void __iomem *cmap_base = odev->funcs->cmap_ioremap(odev, of_node, fb_base);
1241
1242 if (IS_ERR(cmap_base)) {
1243 /* Don't fail; continue without colormap */
1244 drm_warn(dev, "could not find colormap: error %ld\n", PTR_ERR(cmap_base));
1245 } else {
1246 odev->cmap_base = cmap_base;
1247 }
1248 }
1249
1250 /*
1251 * Firmware framebuffer
1252 */
1253
1254 iosys_map_set_vaddr_iomem(&odev->screen_base, screen_base);
1255 odev->mode = ofdrm_mode(width, height);
1256 odev->format = format;
1257 odev->pitch = linebytes;
1258
1259 drm_dbg(dev, "display mode={" DRM_MODE_FMT "}\n", DRM_MODE_ARG(&odev->mode));
1260 drm_dbg(dev, "framebuffer format=%p4cc, size=%dx%d, linebytes=%d byte\n",
1261 &format->format, width, height, linebytes);
1262
1263 /*
1264 * Mode-setting pipeline
1265 */
1266
1267 ret = drmm_mode_config_init(dev);
1268 if (ret)
1269 return ERR_PTR(ret);
1270
1271 max_width = max_t(unsigned long, width, DRM_SHADOW_PLANE_MAX_WIDTH);
1272 max_height = max_t(unsigned long, height, DRM_SHADOW_PLANE_MAX_HEIGHT);
1273
1274 dev->mode_config.min_width = width;
1275 dev->mode_config.max_width = max_width;
1276 dev->mode_config.min_height = height;
1277 dev->mode_config.max_height = max_height;
1278 dev->mode_config.funcs = &ofdrm_mode_config_funcs;
1279 dev->mode_config.preferred_depth = format->depth;
1280 dev->mode_config.quirk_addfb_prefer_host_byte_order = true;
1281
1282 /* Primary plane */
1283
1284 nformats = drm_fb_build_fourcc_list(dev, &format->format, 1,
1285 odev->formats, ARRAY_SIZE(odev->formats));
1286
1287 primary_plane = &odev->primary_plane;
1288 ret = drm_universal_plane_init(dev, primary_plane, 0, &ofdrm_primary_plane_funcs,
1289 odev->formats, nformats,
1290 ofdrm_primary_plane_format_modifiers,
1291 DRM_PLANE_TYPE_PRIMARY, NULL);
1292 if (ret)
1293 return ERR_PTR(ret);
1294 drm_plane_helper_add(primary_plane, &ofdrm_primary_plane_helper_funcs);
1295 drm_plane_enable_fb_damage_clips(primary_plane);
1296
1297 /* CRTC */
1298
1299 crtc = &odev->crtc;
1300 ret = drm_crtc_init_with_planes(dev, crtc, primary_plane, NULL,
1301 &ofdrm_crtc_funcs, NULL);
1302 if (ret)
1303 return ERR_PTR(ret);
1304 drm_crtc_helper_add(crtc, &ofdrm_crtc_helper_funcs);
1305
1306 if (odev->cmap_base) {
1307 drm_mode_crtc_set_gamma_size(crtc, OFDRM_GAMMA_LUT_SIZE);
1308 drm_crtc_enable_color_mgmt(crtc, 0, false, OFDRM_GAMMA_LUT_SIZE);
1309 }
1310
1311 /* Encoder */
1312
1313 encoder = &odev->encoder;
1314 ret = drm_simple_encoder_init(dev, encoder, DRM_MODE_ENCODER_NONE);
1315 if (ret)
1316 return ERR_PTR(ret);
1317 encoder->possible_crtcs = drm_crtc_mask(crtc);
1318
1319 /* Connector */
1320
1321 connector = &odev->connector;
1322 ret = drm_connector_init(dev, connector, &ofdrm_connector_funcs,
1323 DRM_MODE_CONNECTOR_Unknown);
1324 if (ret)
1325 return ERR_PTR(ret);
1326 drm_connector_helper_add(connector, &ofdrm_connector_helper_funcs);
1327 drm_connector_set_panel_orientation_with_quirk(connector,
1328 DRM_MODE_PANEL_ORIENTATION_UNKNOWN,
1329 width, height);
1330
1331 ret = drm_connector_attach_encoder(connector, encoder);
1332 if (ret)
1333 return ERR_PTR(ret);
1334
1335 drm_mode_config_reset(dev);
1336
1337 return odev;
1338 }
1339
1340 /*
1341 * DRM driver
1342 */
1343
1344 DEFINE_DRM_GEM_FOPS(ofdrm_fops);
1345
1346 static struct drm_driver ofdrm_driver = {
1347 DRM_GEM_SHMEM_DRIVER_OPS,
1348 DRM_FBDEV_SHMEM_DRIVER_OPS,
1349 .name = DRIVER_NAME,
1350 .desc = DRIVER_DESC,
1351 .date = DRIVER_DATE,
1352 .major = DRIVER_MAJOR,
1353 .minor = DRIVER_MINOR,
1354 .driver_features = DRIVER_ATOMIC | DRIVER_GEM | DRIVER_MODESET,
1355 .fops = &ofdrm_fops,
1356 };
1357
1358 /*
1359 * Platform driver
1360 */
1361
1362 static int ofdrm_probe(struct platform_device *pdev)
1363 {
1364 struct ofdrm_device *odev;
1365 struct drm_device *dev;
1366 int ret;
1367
1368 odev = ofdrm_device_create(&ofdrm_driver, pdev);
1369 if (IS_ERR(odev))
1370 return PTR_ERR(odev);
1371 dev = &odev->dev;
1372
1373 ret = drm_dev_register(dev, 0);
1374 if (ret)
1375 return ret;
1376
1377 drm_client_setup(dev, odev->format);
1378
1379 return 0;
1380 }
1381
1382 static void ofdrm_remove(struct platform_device *pdev)
1383 {
1384 struct drm_device *dev = platform_get_drvdata(pdev);
1385
1386 drm_dev_unplug(dev);
1387 }
1388
1389 static const struct of_device_id ofdrm_of_match_display[] = {
1390 { .compatible = "display", },
1391 { },
1392 };
1393 MODULE_DEVICE_TABLE(of, ofdrm_of_match_display);
1394
1395 static struct platform_driver ofdrm_platform_driver = {
1396 .driver = {
1397 .name = "of-display",
1398 .of_match_table = ofdrm_of_match_display,
1399 },
1400 .probe = ofdrm_probe,
1401 .remove = ofdrm_remove,
1402 };
1403
1404 module_platform_driver(ofdrm_platform_driver);
1405
1406 MODULE_DESCRIPTION(DRIVER_DESC);
1407 MODULE_LICENSE("GPL");
Linux Kernel