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Merge tag 'linux-watchdog-6.14-rc1' of git://www.linux-watchdog.org/linux-watchdog
[linux.git] / drivers / gpu / drm / ast / ast_drv.c
1 /*
2  * Copyright 2012 Red Hat Inc.
3  *
4  * Permission is hereby granted, free of charge, to any person obtaining a
5  * copy of this software and associated documentation files (the
6  * "Software"), to deal in the Software without restriction, including
7  * without limitation the rights to use, copy, modify, merge, publish,
8  * distribute, sub license, and/or sell copies of the Software, and to
9  * permit persons to whom the Software is furnished to do so, subject to
10  * the following conditions:
11  *
12  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
13  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
14  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
15  * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
16  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
17  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
18  * USE OR OTHER DEALINGS IN THE SOFTWARE.
19  *
20  * The above copyright notice and this permission notice (including the
21  * next paragraph) shall be included in all copies or substantial portions
22  * of the Software.
23  *
24  */
25 /*
26  * Authors: Dave Airlie <[email protected]>
27  */
28
29 #include <linux/aperture.h>
30 #include <linux/module.h>
31 #include <linux/of.h>
32 #include <linux/pci.h>
33
34 #include <drm/clients/drm_client_setup.h>
35 #include <drm/drm_atomic_helper.h>
36 #include <drm/drm_drv.h>
37 #include <drm/drm_fbdev_shmem.h>
38 #include <drm/drm_gem_shmem_helper.h>
39 #include <drm/drm_module.h>
40 #include <drm/drm_probe_helper.h>
41
42 #include "ast_drv.h"
43
44 static int ast_modeset = -1;
45
46 MODULE_PARM_DESC(modeset, "Disable/Enable modesetting");
47 module_param_named(modeset, ast_modeset, int, 0400);
48
49 /*
50  * DRM driver
51  */
52
53 DEFINE_DRM_GEM_FOPS(ast_fops);
54
55 static const struct drm_driver ast_driver = {
56         .driver_features = DRIVER_ATOMIC |
57                            DRIVER_GEM |
58                            DRIVER_MODESET,
59
60         .fops = &ast_fops,
61         .name = DRIVER_NAME,
62         .desc = DRIVER_DESC,
63         .major = DRIVER_MAJOR,
64         .minor = DRIVER_MINOR,
65         .patchlevel = DRIVER_PATCHLEVEL,
66
67         DRM_GEM_SHMEM_DRIVER_OPS,
68         DRM_FBDEV_SHMEM_DRIVER_OPS,
69 };
70
71 /*
72  * PCI driver
73  */
74
75 #define PCI_VENDOR_ASPEED 0x1a03
76
77 #define AST_VGA_DEVICE(id, info) {              \
78         .class = PCI_BASE_CLASS_DISPLAY << 16,  \
79         .class_mask = 0xff0000,                 \
80         .vendor = PCI_VENDOR_ASPEED,                    \
81         .device = id,                           \
82         .subvendor = PCI_ANY_ID,                \
83         .subdevice = PCI_ANY_ID,                \
84         .driver_data = (unsigned long) info }
85
86 static const struct pci_device_id ast_pciidlist[] = {
87         AST_VGA_DEVICE(PCI_CHIP_AST2000, NULL),
88         AST_VGA_DEVICE(PCI_CHIP_AST2100, NULL),
89         {0, 0, 0},
90 };
91
92 MODULE_DEVICE_TABLE(pci, ast_pciidlist);
93
94 static bool ast_is_vga_enabled(void __iomem *ioregs)
95 {
96         u8 vgaer = __ast_read8(ioregs, AST_IO_VGAER);
97
98         return vgaer & AST_IO_VGAER_VGA_ENABLE;
99 }
100
101 static void ast_enable_vga(void __iomem *ioregs)
102 {
103         __ast_write8(ioregs, AST_IO_VGAER, AST_IO_VGAER_VGA_ENABLE);
104         __ast_write8(ioregs, AST_IO_VGAMR_W, AST_IO_VGAMR_IOSEL);
105 }
106
107 /*
108  * Run this function as part of the HW device cleanup; not
109  * when the DRM device gets released.
110  */
111 static void ast_enable_mmio_release(void *data)
112 {
113         void __iomem *ioregs = (void __force __iomem *)data;
114
115         /* enable standard VGA decode */
116         __ast_write8_i(ioregs, AST_IO_VGACRI, 0xa1, AST_IO_VGACRA1_MMIO_ENABLED);
117 }
118
119 static int ast_enable_mmio(struct device *dev, void __iomem *ioregs)
120 {
121         void *data = (void __force *)ioregs;
122
123         __ast_write8_i(ioregs, AST_IO_VGACRI, 0xa1,
124                        AST_IO_VGACRA1_MMIO_ENABLED |
125                        AST_IO_VGACRA1_VGAIO_DISABLED);
126
127         return devm_add_action_or_reset(dev, ast_enable_mmio_release, data);
128 }
129
130 static void ast_open_key(void __iomem *ioregs)
131 {
132         __ast_write8_i(ioregs, AST_IO_VGACRI, 0x80, AST_IO_VGACR80_PASSWORD);
133 }
134
135 static int ast_detect_chip(struct pci_dev *pdev,
136                            void __iomem *regs, void __iomem *ioregs,
137                            enum ast_chip *chip_out,
138                            enum ast_config_mode *config_mode_out)
139 {
140         struct device *dev = &pdev->dev;
141         struct device_node *np = dev->of_node;
142         enum ast_config_mode config_mode = ast_use_defaults;
143         uint32_t scu_rev = 0xffffffff;
144         enum ast_chip chip;
145         u32 data;
146         u8 vgacrd0, vgacrd1;
147
148         /*
149          * Find configuration mode and read SCU revision
150          */
151
152         /* Check if we have device-tree properties */
153         if (np && !of_property_read_u32(np, "aspeed,scu-revision-id", &data)) {
154                 /* We do, disable P2A access */
155                 config_mode = ast_use_dt;
156                 scu_rev = data;
157         } else if (pdev->device == PCI_CHIP_AST2000) { // Not all families have a P2A bridge
158                 /*
159                  * The BMC will set SCU 0x40 D[12] to 1 if the P2 bridge
160                  * is disabled. We force using P2A if VGA only mode bit
161                  * is set D[7]
162                  */
163                 vgacrd0 = __ast_read8_i(ioregs, AST_IO_VGACRI, 0xd0);
164                 vgacrd1 = __ast_read8_i(ioregs, AST_IO_VGACRI, 0xd1);
165                 if (!(vgacrd0 & 0x80) || !(vgacrd1 & 0x10)) {
166
167                         /*
168                          * We have a P2A bridge and it is enabled.
169                          */
170
171                         /* Patch AST2500/AST2510 */
172                         if ((pdev->revision & 0xf0) == 0x40) {
173                                 if (!(vgacrd0 & AST_VRAM_INIT_STATUS_MASK))
174                                         ast_patch_ahb_2500(regs);
175                         }
176
177                         /* Double check that it's actually working */
178                         data = __ast_read32(regs, 0xf004);
179                         if ((data != 0xffffffff) && (data != 0x00)) {
180                                 config_mode = ast_use_p2a;
181
182                                 /* Read SCU7c (silicon revision register) */
183                                 __ast_write32(regs, 0xf004, 0x1e6e0000);
184                                 __ast_write32(regs, 0xf000, 0x1);
185                                 scu_rev = __ast_read32(regs, 0x1207c);
186                         }
187                 }
188         }
189
190         switch (config_mode) {
191         case ast_use_defaults:
192                 dev_info(dev, "Using default configuration\n");
193                 break;
194         case ast_use_dt:
195                 dev_info(dev, "Using device-tree for configuration\n");
196                 break;
197         case ast_use_p2a:
198                 dev_info(dev, "Using P2A bridge for configuration\n");
199                 break;
200         }
201
202         /*
203          * Identify chipset
204          */
205
206         if (pdev->revision >= 0x50) {
207                 chip = AST2600;
208                 dev_info(dev, "AST 2600 detected\n");
209         } else if (pdev->revision >= 0x40) {
210                 switch (scu_rev & 0x300) {
211                 case 0x0100:
212                         chip = AST2510;
213                         dev_info(dev, "AST 2510 detected\n");
214                         break;
215                 default:
216                         chip = AST2500;
217                         dev_info(dev, "AST 2500 detected\n");
218                         break;
219                 }
220         } else if (pdev->revision >= 0x30) {
221                 switch (scu_rev & 0x300) {
222                 case 0x0100:
223                         chip = AST1400;
224                         dev_info(dev, "AST 1400 detected\n");
225                         break;
226                 default:
227                         chip = AST2400;
228                         dev_info(dev, "AST 2400 detected\n");
229                         break;
230                 }
231         } else if (pdev->revision >= 0x20) {
232                 switch (scu_rev & 0x300) {
233                 case 0x0000:
234                         chip = AST1300;
235                         dev_info(dev, "AST 1300 detected\n");
236                         break;
237                 default:
238                         chip = AST2300;
239                         dev_info(dev, "AST 2300 detected\n");
240                         break;
241                 }
242         } else if (pdev->revision >= 0x10) {
243                 switch (scu_rev & 0x0300) {
244                 case 0x0200:
245                         chip = AST1100;
246                         dev_info(dev, "AST 1100 detected\n");
247                         break;
248                 case 0x0100:
249                         chip = AST2200;
250                         dev_info(dev, "AST 2200 detected\n");
251                         break;
252                 case 0x0000:
253                         chip = AST2150;
254                         dev_info(dev, "AST 2150 detected\n");
255                         break;
256                 default:
257                         chip = AST2100;
258                         dev_info(dev, "AST 2100 detected\n");
259                         break;
260                 }
261         } else {
262                 chip = AST2000;
263                 dev_info(dev, "AST 2000 detected\n");
264         }
265
266         *chip_out = chip;
267         *config_mode_out = config_mode;
268
269         return 0;
270 }
271
272 static int ast_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
273 {
274         struct device *dev = &pdev->dev;
275         int ret;
276         void __iomem *regs;
277         void __iomem *ioregs;
278         enum ast_config_mode config_mode;
279         enum ast_chip chip;
280         struct drm_device *drm;
281         bool need_post = false;
282
283         ret = aperture_remove_conflicting_pci_devices(pdev, ast_driver.name);
284         if (ret)
285                 return ret;
286
287         ret = pcim_enable_device(pdev);
288         if (ret)
289                 return ret;
290
291         regs = pcim_iomap_region(pdev, 1, "ast");
292         if (IS_ERR(regs))
293                 return PTR_ERR(regs);
294
295         if (pdev->revision >= 0x40) {
296                 /*
297                  * On AST2500 and later models, MMIO is enabled by
298                  * default. Adopt it to be compatible with ARM.
299                  */
300                 resource_size_t len = pci_resource_len(pdev, 1);
301
302                 if (len < AST_IO_MM_OFFSET)
303                         return -EIO;
304                 if ((len - AST_IO_MM_OFFSET) < AST_IO_MM_LENGTH)
305                         return -EIO;
306                 ioregs = regs + AST_IO_MM_OFFSET;
307         } else if (pci_resource_flags(pdev, 2) & IORESOURCE_IO) {
308                 /*
309                  * Map I/O registers if we have a PCI BAR for I/O.
310                  */
311                 resource_size_t len = pci_resource_len(pdev, 2);
312
313                 if (len < AST_IO_MM_LENGTH)
314                         return -EIO;
315                 ioregs = pcim_iomap_region(pdev, 2, "ast");
316                 if (IS_ERR(ioregs))
317                         return PTR_ERR(ioregs);
318         } else {
319                 /*
320                  * Anything else is best effort.
321                  */
322                 resource_size_t len = pci_resource_len(pdev, 1);
323
324                 if (len < AST_IO_MM_OFFSET)
325                         return -EIO;
326                 if ((len - AST_IO_MM_OFFSET) < AST_IO_MM_LENGTH)
327                         return -EIO;
328                 ioregs = regs + AST_IO_MM_OFFSET;
329
330                 dev_info(dev, "Platform has no I/O space, using MMIO\n");
331         }
332
333         if (!ast_is_vga_enabled(ioregs)) {
334                 dev_info(dev, "VGA not enabled on entry, requesting chip POST\n");
335                 need_post = true;
336         }
337
338         /*
339          * If VGA isn't enabled, we need to enable now or subsequent
340          * access to the scratch registers will fail.
341          */
342         if (need_post)
343                 ast_enable_vga(ioregs);
344         /* Enable extended register access */
345         ast_open_key(ioregs);
346
347         ret = ast_enable_mmio(dev, ioregs);
348         if (ret)
349                 return ret;
350
351         ret = ast_detect_chip(pdev, regs, ioregs, &chip, &config_mode);
352         if (ret)
353                 return ret;
354
355         drm = ast_device_create(pdev, &ast_driver, chip, config_mode, regs, ioregs, need_post);
356         if (IS_ERR(drm))
357                 return PTR_ERR(drm);
358         pci_set_drvdata(pdev, drm);
359
360         ret = drm_dev_register(drm, ent->driver_data);
361         if (ret)
362                 return ret;
363
364         drm_client_setup(drm, NULL);
365
366         return 0;
367 }
368
369 static void ast_pci_remove(struct pci_dev *pdev)
370 {
371         struct drm_device *dev = pci_get_drvdata(pdev);
372
373         drm_dev_unregister(dev);
374         drm_atomic_helper_shutdown(dev);
375 }
376
377 static void ast_pci_shutdown(struct pci_dev *pdev)
378 {
379         drm_atomic_helper_shutdown(pci_get_drvdata(pdev));
380 }
381
382 static int ast_drm_freeze(struct drm_device *dev)
383 {
384         int error;
385
386         error = drm_mode_config_helper_suspend(dev);
387         if (error)
388                 return error;
389         pci_save_state(to_pci_dev(dev->dev));
390         return 0;
391 }
392
393 static int ast_drm_thaw(struct drm_device *dev)
394 {
395         struct ast_device *ast = to_ast_device(dev);
396
397         ast_enable_vga(ast->ioregs);
398         ast_open_key(ast->ioregs);
399         ast_enable_mmio(dev->dev, ast->ioregs);
400         ast_post_gpu(ast);
401
402         return drm_mode_config_helper_resume(dev);
403 }
404
405 static int ast_drm_resume(struct drm_device *dev)
406 {
407         if (pci_enable_device(to_pci_dev(dev->dev)))
408                 return -EIO;
409
410         return ast_drm_thaw(dev);
411 }
412
413 static int ast_pm_suspend(struct device *dev)
414 {
415         struct pci_dev *pdev = to_pci_dev(dev);
416         struct drm_device *ddev = pci_get_drvdata(pdev);
417         int error;
418
419         error = ast_drm_freeze(ddev);
420         if (error)
421                 return error;
422
423         pci_disable_device(pdev);
424         pci_set_power_state(pdev, PCI_D3hot);
425         return 0;
426 }
427
428 static int ast_pm_resume(struct device *dev)
429 {
430         struct pci_dev *pdev = to_pci_dev(dev);
431         struct drm_device *ddev = pci_get_drvdata(pdev);
432         return ast_drm_resume(ddev);
433 }
434
435 static int ast_pm_freeze(struct device *dev)
436 {
437         struct pci_dev *pdev = to_pci_dev(dev);
438         struct drm_device *ddev = pci_get_drvdata(pdev);
439         return ast_drm_freeze(ddev);
440 }
441
442 static int ast_pm_thaw(struct device *dev)
443 {
444         struct pci_dev *pdev = to_pci_dev(dev);
445         struct drm_device *ddev = pci_get_drvdata(pdev);
446         return ast_drm_thaw(ddev);
447 }
448
449 static int ast_pm_poweroff(struct device *dev)
450 {
451         struct pci_dev *pdev = to_pci_dev(dev);
452         struct drm_device *ddev = pci_get_drvdata(pdev);
453
454         return ast_drm_freeze(ddev);
455 }
456
457 static const struct dev_pm_ops ast_pm_ops = {
458         .suspend = ast_pm_suspend,
459         .resume = ast_pm_resume,
460         .freeze = ast_pm_freeze,
461         .thaw = ast_pm_thaw,
462         .poweroff = ast_pm_poweroff,
463         .restore = ast_pm_resume,
464 };
465
466 static struct pci_driver ast_pci_driver = {
467         .name = DRIVER_NAME,
468         .id_table = ast_pciidlist,
469         .probe = ast_pci_probe,
470         .remove = ast_pci_remove,
471         .shutdown = ast_pci_shutdown,
472         .driver.pm = &ast_pm_ops,
473 };
474
475 drm_module_pci_driver_if_modeset(ast_pci_driver, ast_modeset);
476
477 MODULE_AUTHOR(DRIVER_AUTHOR);
478 MODULE_DESCRIPTION(DRIVER_DESC);
479 MODULE_LICENSE("GPL and additional rights");
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