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ARM: fix build errors caused by selection of errata 798181
[karo-tx-linux.git] / drivers / gpu / drm / msm / msm_gpu.c
1 /*
2  * Copyright (C) 2013 Red Hat
3  * Author: Rob Clark <robdclark@gmail.com>
4  *
5  * This program is free software; you can redistribute it and/or modify it
6  * under the terms of the GNU General Public License version 2 as published by
7  * the Free Software Foundation.
8  *
9  * This program is distributed in the hope that it will be useful, but WITHOUT
10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
12  * more details.
13  *
14  * You should have received a copy of the GNU General Public License along with
15  * this program.  If not, see <http://www.gnu.org/licenses/>.
16  */
17
18 #include "msm_gpu.h"
19 #include "msm_gem.h"
20
21
22 /*
23  * Power Management:
24  */
25
26 #ifdef CONFIG_MSM_BUS_SCALING
27 #include <mach/board.h>
28 #include <mach/kgsl.h>
29 static void bs_init(struct msm_gpu *gpu, struct platform_device *pdev)
30 {
31         struct drm_device *dev = gpu->dev;
32         struct kgsl_device_platform_data *pdata = pdev->dev.platform_data;
33
34         if (!pdev) {
35                 dev_err(dev->dev, "could not find dtv pdata\n");
36                 return;
37         }
38
39         if (pdata->bus_scale_table) {
40                 gpu->bsc = msm_bus_scale_register_client(pdata->bus_scale_table);
41                 DBG("bus scale client: %08x", gpu->bsc);
42         }
43 }
44
45 static void bs_fini(struct msm_gpu *gpu)
46 {
47         if (gpu->bsc) {
48                 msm_bus_scale_unregister_client(gpu->bsc);
49                 gpu->bsc = 0;
50         }
51 }
52
53 static void bs_set(struct msm_gpu *gpu, int idx)
54 {
55         if (gpu->bsc) {
56                 DBG("set bus scaling: %d", idx);
57                 msm_bus_scale_client_update_request(gpu->bsc, idx);
58         }
59 }
60 #else
61 static void bs_init(struct msm_gpu *gpu, struct platform_device *pdev) {}
62 static void bs_fini(struct msm_gpu *gpu) {}
63 static void bs_set(struct msm_gpu *gpu, int idx) {}
64 #endif
65
66 static int enable_pwrrail(struct msm_gpu *gpu)
67 {
68         struct drm_device *dev = gpu->dev;
69         int ret = 0;
70
71         if (gpu->gpu_reg) {
72                 ret = regulator_enable(gpu->gpu_reg);
73                 if (ret) {
74                         dev_err(dev->dev, "failed to enable 'gpu_reg': %d\n", ret);
75                         return ret;
76                 }
77         }
78
79         if (gpu->gpu_cx) {
80                 ret = regulator_enable(gpu->gpu_cx);
81                 if (ret) {
82                         dev_err(dev->dev, "failed to enable 'gpu_cx': %d\n", ret);
83                         return ret;
84                 }
85         }
86
87         return 0;
88 }
89
90 static int disable_pwrrail(struct msm_gpu *gpu)
91 {
92         if (gpu->gpu_cx)
93                 regulator_disable(gpu->gpu_cx);
94         if (gpu->gpu_reg)
95                 regulator_disable(gpu->gpu_reg);
96         return 0;
97 }
98
99 static int enable_clk(struct msm_gpu *gpu)
100 {
101         struct clk *rate_clk = NULL;
102         int i;
103
104         /* NOTE: kgsl_pwrctrl_clk() ignores grp_clks[0].. */
105         for (i = ARRAY_SIZE(gpu->grp_clks) - 1; i > 0; i--) {
106                 if (gpu->grp_clks[i]) {
107                         clk_prepare(gpu->grp_clks[i]);
108                         rate_clk = gpu->grp_clks[i];
109                 }
110         }
111
112         if (rate_clk && gpu->fast_rate)
113                 clk_set_rate(rate_clk, gpu->fast_rate);
114
115         for (i = ARRAY_SIZE(gpu->grp_clks) - 1; i > 0; i--)
116                 if (gpu->grp_clks[i])
117                         clk_enable(gpu->grp_clks[i]);
118
119         return 0;
120 }
121
122 static int disable_clk(struct msm_gpu *gpu)
123 {
124         struct clk *rate_clk = NULL;
125         int i;
126
127         /* NOTE: kgsl_pwrctrl_clk() ignores grp_clks[0].. */
128         for (i = ARRAY_SIZE(gpu->grp_clks) - 1; i > 0; i--) {
129                 if (gpu->grp_clks[i]) {
130                         clk_disable(gpu->grp_clks[i]);
131                         rate_clk = gpu->grp_clks[i];
132                 }
133         }
134
135         if (rate_clk && gpu->slow_rate)
136                 clk_set_rate(rate_clk, gpu->slow_rate);
137
138         for (i = ARRAY_SIZE(gpu->grp_clks) - 1; i > 0; i--)
139                 if (gpu->grp_clks[i])
140                         clk_unprepare(gpu->grp_clks[i]);
141
142         return 0;
143 }
144
145 static int enable_axi(struct msm_gpu *gpu)
146 {
147         if (gpu->ebi1_clk)
148                 clk_prepare_enable(gpu->ebi1_clk);
149         if (gpu->bus_freq)
150                 bs_set(gpu, gpu->bus_freq);
151         return 0;
152 }
153
154 static int disable_axi(struct msm_gpu *gpu)
155 {
156         if (gpu->ebi1_clk)
157                 clk_disable_unprepare(gpu->ebi1_clk);
158         if (gpu->bus_freq)
159                 bs_set(gpu, 0);
160         return 0;
161 }
162
163 int msm_gpu_pm_resume(struct msm_gpu *gpu)
164 {
165         int ret;
166
167         DBG("%s", gpu->name);
168
169         ret = enable_pwrrail(gpu);
170         if (ret)
171                 return ret;
172
173         ret = enable_clk(gpu);
174         if (ret)
175                 return ret;
176
177         ret = enable_axi(gpu);
178         if (ret)
179                 return ret;
180
181         return 0;
182 }
183
184 int msm_gpu_pm_suspend(struct msm_gpu *gpu)
185 {
186         int ret;
187
188         DBG("%s", gpu->name);
189
190         ret = disable_axi(gpu);
191         if (ret)
192                 return ret;
193
194         ret = disable_clk(gpu);
195         if (ret)
196                 return ret;
197
198         ret = disable_pwrrail(gpu);
199         if (ret)
200                 return ret;
201
202         return 0;
203 }
204
205 /*
206  * Hangcheck detection for locked gpu:
207  */
208
209 static void recover_worker(struct work_struct *work)
210 {
211         struct msm_gpu *gpu = container_of(work, struct msm_gpu, recover_work);
212         struct drm_device *dev = gpu->dev;
213
214         dev_err(dev->dev, "%s: hangcheck recover!\n", gpu->name);
215
216         mutex_lock(&dev->struct_mutex);
217         gpu->funcs->recover(gpu);
218         mutex_unlock(&dev->struct_mutex);
219
220         msm_gpu_retire(gpu);
221 }
222
223 static void hangcheck_timer_reset(struct msm_gpu *gpu)
224 {
225         DBG("%s", gpu->name);
226         mod_timer(&gpu->hangcheck_timer,
227                         round_jiffies_up(jiffies + DRM_MSM_HANGCHECK_JIFFIES));
228 }
229
230 static void hangcheck_handler(unsigned long data)
231 {
232         struct msm_gpu *gpu = (struct msm_gpu *)data;
233         uint32_t fence = gpu->funcs->last_fence(gpu);
234
235         if (fence != gpu->hangcheck_fence) {
236                 /* some progress has been made.. ya! */
237                 gpu->hangcheck_fence = fence;
238         } else if (fence < gpu->submitted_fence) {
239                 /* no progress and not done.. hung! */
240                 struct msm_drm_private *priv = gpu->dev->dev_private;
241                 gpu->hangcheck_fence = fence;
242                 queue_work(priv->wq, &gpu->recover_work);
243         }
244
245         /* if still more pending work, reset the hangcheck timer: */
246         if (gpu->submitted_fence > gpu->hangcheck_fence)
247                 hangcheck_timer_reset(gpu);
248 }
249
250 /*
251  * Cmdstream submission/retirement:
252  */
253
254 static void retire_worker(struct work_struct *work)
255 {
256         struct msm_gpu *gpu = container_of(work, struct msm_gpu, retire_work);
257         struct drm_device *dev = gpu->dev;
258         uint32_t fence = gpu->funcs->last_fence(gpu);
259
260         mutex_lock(&dev->struct_mutex);
261
262         while (!list_empty(&gpu->active_list)) {
263                 struct msm_gem_object *obj;
264
265                 obj = list_first_entry(&gpu->active_list,
266                                 struct msm_gem_object, mm_list);
267
268                 if (obj->fence <= fence) {
269                         /* move to inactive: */
270                         msm_gem_move_to_inactive(&obj->base);
271                         msm_gem_put_iova(&obj->base, gpu->id);
272                         drm_gem_object_unreference(&obj->base);
273                 } else {
274                         break;
275                 }
276         }
277
278         msm_update_fence(gpu->dev, fence);
279
280         mutex_unlock(&dev->struct_mutex);
281 }
282
283 /* call from irq handler to schedule work to retire bo's */
284 void msm_gpu_retire(struct msm_gpu *gpu)
285 {
286         struct msm_drm_private *priv = gpu->dev->dev_private;
287         queue_work(priv->wq, &gpu->retire_work);
288 }
289
290 /* add bo's to gpu's ring, and kick gpu: */
291 int msm_gpu_submit(struct msm_gpu *gpu, struct msm_gem_submit *submit,
292                 struct msm_file_private *ctx)
293 {
294         struct drm_device *dev = gpu->dev;
295         struct msm_drm_private *priv = dev->dev_private;
296         int i, ret;
297
298         mutex_lock(&dev->struct_mutex);
299
300         submit->fence = ++priv->next_fence;
301
302         gpu->submitted_fence = submit->fence;
303
304         ret = gpu->funcs->submit(gpu, submit, ctx);
305         priv->lastctx = ctx;
306
307         for (i = 0; i < submit->nr_bos; i++) {
308                 struct msm_gem_object *msm_obj = submit->bos[i].obj;
309
310                 /* can't happen yet.. but when we add 2d support we'll have
311                  * to deal w/ cross-ring synchronization:
312                  */
313                 WARN_ON(is_active(msm_obj) && (msm_obj->gpu != gpu));
314
315                 if (!is_active(msm_obj)) {
316                         uint32_t iova;
317
318                         /* ring takes a reference to the bo and iova: */
319                         drm_gem_object_reference(&msm_obj->base);
320                         msm_gem_get_iova_locked(&msm_obj->base,
321                                         submit->gpu->id, &iova);
322                 }
323
324                 msm_gem_move_to_active(&msm_obj->base, gpu, submit->fence);
325         }
326         hangcheck_timer_reset(gpu);
327         mutex_unlock(&dev->struct_mutex);
328
329         return ret;
330 }
331
332 /*
333  * Init/Cleanup:
334  */
335
336 static irqreturn_t irq_handler(int irq, void *data)
337 {
338         struct msm_gpu *gpu = data;
339         return gpu->funcs->irq(gpu);
340 }
341
342 static const char *clk_names[] = {
343                 "src_clk", "core_clk", "iface_clk", "mem_clk", "mem_iface_clk",
344 };
345
346 int msm_gpu_init(struct drm_device *drm, struct platform_device *pdev,
347                 struct msm_gpu *gpu, const struct msm_gpu_funcs *funcs,
348                 const char *name, const char *ioname, const char *irqname, int ringsz)
349 {
350         int i, ret;
351
352         gpu->dev = drm;
353         gpu->funcs = funcs;
354         gpu->name = name;
355
356         INIT_LIST_HEAD(&gpu->active_list);
357         INIT_WORK(&gpu->retire_work, retire_worker);
358         INIT_WORK(&gpu->recover_work, recover_worker);
359
360         setup_timer(&gpu->hangcheck_timer, hangcheck_handler,
361                         (unsigned long)gpu);
362
363         BUG_ON(ARRAY_SIZE(clk_names) != ARRAY_SIZE(gpu->grp_clks));
364
365         /* Map registers: */
366         gpu->mmio = msm_ioremap(pdev, ioname, name);
367         if (IS_ERR(gpu->mmio)) {
368                 ret = PTR_ERR(gpu->mmio);
369                 goto fail;
370         }
371
372         /* Get Interrupt: */
373         gpu->irq = platform_get_irq_byname(pdev, irqname);
374         if (gpu->irq < 0) {
375                 ret = gpu->irq;
376                 dev_err(drm->dev, "failed to get irq: %d\n", ret);
377                 goto fail;
378         }
379
380         ret = devm_request_irq(&pdev->dev, gpu->irq, irq_handler,
381                         IRQF_TRIGGER_HIGH, gpu->name, gpu);
382         if (ret) {
383                 dev_err(drm->dev, "failed to request IRQ%u: %d\n", gpu->irq, ret);
384                 goto fail;
385         }
386
387         /* Acquire clocks: */
388         for (i = 0; i < ARRAY_SIZE(clk_names); i++) {
389                 gpu->grp_clks[i] = devm_clk_get(&pdev->dev, clk_names[i]);
390                 DBG("grp_clks[%s]: %p", clk_names[i], gpu->grp_clks[i]);
391                 if (IS_ERR(gpu->grp_clks[i]))
392                         gpu->grp_clks[i] = NULL;
393         }
394
395         gpu->ebi1_clk = devm_clk_get(&pdev->dev, "bus_clk");
396         DBG("ebi1_clk: %p", gpu->ebi1_clk);
397         if (IS_ERR(gpu->ebi1_clk))
398                 gpu->ebi1_clk = NULL;
399
400         /* Acquire regulators: */
401         gpu->gpu_reg = devm_regulator_get(&pdev->dev, "vdd");
402         DBG("gpu_reg: %p", gpu->gpu_reg);
403         if (IS_ERR(gpu->gpu_reg))
404                 gpu->gpu_reg = NULL;
405
406         gpu->gpu_cx = devm_regulator_get(&pdev->dev, "vddcx");
407         DBG("gpu_cx: %p", gpu->gpu_cx);
408         if (IS_ERR(gpu->gpu_cx))
409                 gpu->gpu_cx = NULL;
410
411         /* Setup IOMMU.. eventually we will (I think) do this once per context
412          * and have separate page tables per context.  For now, to keep things
413          * simple and to get something working, just use a single address space:
414          */
415         gpu->iommu = iommu_domain_alloc(&platform_bus_type);
416         if (!gpu->iommu) {
417                 dev_err(drm->dev, "failed to allocate IOMMU\n");
418                 ret = -ENOMEM;
419                 goto fail;
420         }
421         gpu->id = msm_register_iommu(drm, gpu->iommu);
422
423         /* Create ringbuffer: */
424         gpu->rb = msm_ringbuffer_new(gpu, ringsz);
425         if (IS_ERR(gpu->rb)) {
426                 ret = PTR_ERR(gpu->rb);
427                 gpu->rb = NULL;
428                 dev_err(drm->dev, "could not create ringbuffer: %d\n", ret);
429                 goto fail;
430         }
431
432         ret = msm_gem_get_iova_locked(gpu->rb->bo, gpu->id, &gpu->rb_iova);
433         if (ret) {
434                 gpu->rb_iova = 0;
435                 dev_err(drm->dev, "could not map ringbuffer: %d\n", ret);
436                 goto fail;
437         }
438
439         bs_init(gpu, pdev);
440
441         return 0;
442
443 fail:
444         return ret;
445 }
446
447 void msm_gpu_cleanup(struct msm_gpu *gpu)
448 {
449         DBG("%s", gpu->name);
450
451         WARN_ON(!list_empty(&gpu->active_list));
452
453         bs_fini(gpu);
454
455         if (gpu->rb) {
456                 if (gpu->rb_iova)
457                         msm_gem_put_iova(gpu->rb->bo, gpu->id);
458                 msm_ringbuffer_destroy(gpu->rb);
459         }
460
461         if (gpu->iommu)
462                 iommu_domain_free(gpu->iommu);
463 }