drm/amdgpu: Remove in_interrupt() usage in gfx_v9_0_kiq_read_clock()
[linux-2.6-microblaze.git] / drivers / gpu / drm / amd / amdgpu / tonga_ih.c
1 /*
2  * Copyright 2014 Advanced Micro Devices, 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 "Software"),
6  * to deal in the Software without restriction, including without limitation
7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8  * and/or sell copies of the Software, and to permit persons to whom the
9  * Software is furnished to do so, subject to the following conditions:
10  *
11  * The above copyright notice and this permission notice shall be included in
12  * all copies or substantial portions of the Software.
13  *
14  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
17  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
18  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
19  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
20  * OTHER DEALINGS IN THE SOFTWARE.
21  *
22  */
23
24 #include <linux/pci.h>
25
26 #include "amdgpu.h"
27 #include "amdgpu_ih.h"
28 #include "vid.h"
29
30 #include "oss/oss_3_0_d.h"
31 #include "oss/oss_3_0_sh_mask.h"
32
33 #include "bif/bif_5_1_d.h"
34 #include "bif/bif_5_1_sh_mask.h"
35
36 /*
37  * Interrupts
38  * Starting with r6xx, interrupts are handled via a ring buffer.
39  * Ring buffers are areas of GPU accessible memory that the GPU
40  * writes interrupt vectors into and the host reads vectors out of.
41  * There is a rptr (read pointer) that determines where the
42  * host is currently reading, and a wptr (write pointer)
43  * which determines where the GPU has written.  When the
44  * pointers are equal, the ring is idle.  When the GPU
45  * writes vectors to the ring buffer, it increments the
46  * wptr.  When there is an interrupt, the host then starts
47  * fetching commands and processing them until the pointers are
48  * equal again at which point it updates the rptr.
49  */
50
51 static void tonga_ih_set_interrupt_funcs(struct amdgpu_device *adev);
52
53 /**
54  * tonga_ih_enable_interrupts - Enable the interrupt ring buffer
55  *
56  * @adev: amdgpu_device pointer
57  *
58  * Enable the interrupt ring buffer (VI).
59  */
60 static void tonga_ih_enable_interrupts(struct amdgpu_device *adev)
61 {
62         u32 ih_rb_cntl = RREG32(mmIH_RB_CNTL);
63
64         ih_rb_cntl = REG_SET_FIELD(ih_rb_cntl, IH_RB_CNTL, RB_ENABLE, 1);
65         ih_rb_cntl = REG_SET_FIELD(ih_rb_cntl, IH_RB_CNTL, ENABLE_INTR, 1);
66         WREG32(mmIH_RB_CNTL, ih_rb_cntl);
67         adev->irq.ih.enabled = true;
68 }
69
70 /**
71  * tonga_ih_disable_interrupts - Disable the interrupt ring buffer
72  *
73  * @adev: amdgpu_device pointer
74  *
75  * Disable the interrupt ring buffer (VI).
76  */
77 static void tonga_ih_disable_interrupts(struct amdgpu_device *adev)
78 {
79         u32 ih_rb_cntl = RREG32(mmIH_RB_CNTL);
80
81         ih_rb_cntl = REG_SET_FIELD(ih_rb_cntl, IH_RB_CNTL, RB_ENABLE, 0);
82         ih_rb_cntl = REG_SET_FIELD(ih_rb_cntl, IH_RB_CNTL, ENABLE_INTR, 0);
83         WREG32(mmIH_RB_CNTL, ih_rb_cntl);
84         /* set rptr, wptr to 0 */
85         WREG32(mmIH_RB_RPTR, 0);
86         WREG32(mmIH_RB_WPTR, 0);
87         adev->irq.ih.enabled = false;
88         adev->irq.ih.rptr = 0;
89 }
90
91 /**
92  * tonga_ih_irq_init - init and enable the interrupt ring
93  *
94  * @adev: amdgpu_device pointer
95  *
96  * Allocate a ring buffer for the interrupt controller,
97  * enable the RLC, disable interrupts, enable the IH
98  * ring buffer and enable it (VI).
99  * Called at device load and reume.
100  * Returns 0 for success, errors for failure.
101  */
102 static int tonga_ih_irq_init(struct amdgpu_device *adev)
103 {
104         u32 interrupt_cntl, ih_rb_cntl, ih_doorbell_rtpr;
105         struct amdgpu_ih_ring *ih = &adev->irq.ih;
106         int rb_bufsz;
107
108         /* disable irqs */
109         tonga_ih_disable_interrupts(adev);
110
111         /* setup interrupt control */
112         WREG32(mmINTERRUPT_CNTL2, adev->dummy_page_addr >> 8);
113         interrupt_cntl = RREG32(mmINTERRUPT_CNTL);
114         /* INTERRUPT_CNTL__IH_DUMMY_RD_OVERRIDE_MASK=0 - dummy read disabled with msi, enabled without msi
115          * INTERRUPT_CNTL__IH_DUMMY_RD_OVERRIDE_MASK=1 - dummy read controlled by IH_DUMMY_RD_EN
116          */
117         interrupt_cntl = REG_SET_FIELD(interrupt_cntl, INTERRUPT_CNTL, IH_DUMMY_RD_OVERRIDE, 0);
118         /* INTERRUPT_CNTL__IH_REQ_NONSNOOP_EN_MASK=1 if ring is in non-cacheable memory, e.g., vram */
119         interrupt_cntl = REG_SET_FIELD(interrupt_cntl, INTERRUPT_CNTL, IH_REQ_NONSNOOP_EN, 0);
120         WREG32(mmINTERRUPT_CNTL, interrupt_cntl);
121
122         /* Ring Buffer base. [39:8] of 40-bit address of the beginning of the ring buffer*/
123         WREG32(mmIH_RB_BASE, ih->gpu_addr >> 8);
124
125         rb_bufsz = order_base_2(adev->irq.ih.ring_size / 4);
126         ih_rb_cntl = REG_SET_FIELD(0, IH_RB_CNTL, WPTR_OVERFLOW_CLEAR, 1);
127         ih_rb_cntl = REG_SET_FIELD(ih_rb_cntl, IH_RB_CNTL, RB_SIZE, rb_bufsz);
128         /* Ring Buffer write pointer writeback. If enabled, IH_RB_WPTR register value is written to memory */
129         ih_rb_cntl = REG_SET_FIELD(ih_rb_cntl, IH_RB_CNTL, WPTR_WRITEBACK_ENABLE, 1);
130         ih_rb_cntl = REG_SET_FIELD(ih_rb_cntl, IH_RB_CNTL, MC_VMID, 0);
131
132         if (adev->irq.msi_enabled)
133                 ih_rb_cntl = REG_SET_FIELD(ih_rb_cntl, IH_RB_CNTL, RPTR_REARM, 1);
134
135         WREG32(mmIH_RB_CNTL, ih_rb_cntl);
136
137         /* set the writeback address whether it's enabled or not */
138         WREG32(mmIH_RB_WPTR_ADDR_LO, lower_32_bits(ih->wptr_addr));
139         WREG32(mmIH_RB_WPTR_ADDR_HI, upper_32_bits(ih->wptr_addr) & 0xFF);
140
141         /* set rptr, wptr to 0 */
142         WREG32(mmIH_RB_RPTR, 0);
143         WREG32(mmIH_RB_WPTR, 0);
144
145         ih_doorbell_rtpr = RREG32(mmIH_DOORBELL_RPTR);
146         if (adev->irq.ih.use_doorbell) {
147                 ih_doorbell_rtpr = REG_SET_FIELD(ih_doorbell_rtpr, IH_DOORBELL_RPTR,
148                                                  OFFSET, adev->irq.ih.doorbell_index);
149                 ih_doorbell_rtpr = REG_SET_FIELD(ih_doorbell_rtpr, IH_DOORBELL_RPTR,
150                                                  ENABLE, 1);
151         } else {
152                 ih_doorbell_rtpr = REG_SET_FIELD(ih_doorbell_rtpr, IH_DOORBELL_RPTR,
153                                                  ENABLE, 0);
154         }
155         WREG32(mmIH_DOORBELL_RPTR, ih_doorbell_rtpr);
156
157         pci_set_master(adev->pdev);
158
159         /* enable interrupts */
160         tonga_ih_enable_interrupts(adev);
161
162         return 0;
163 }
164
165 /**
166  * tonga_ih_irq_disable - disable interrupts
167  *
168  * @adev: amdgpu_device pointer
169  *
170  * Disable interrupts on the hw (VI).
171  */
172 static void tonga_ih_irq_disable(struct amdgpu_device *adev)
173 {
174         tonga_ih_disable_interrupts(adev);
175
176         /* Wait and acknowledge irq */
177         mdelay(1);
178 }
179
180 /**
181  * tonga_ih_get_wptr - get the IH ring buffer wptr
182  *
183  * @adev: amdgpu_device pointer
184  * @ih: IH ring buffer to fetch wptr
185  *
186  * Get the IH ring buffer wptr from either the register
187  * or the writeback memory buffer (VI).  Also check for
188  * ring buffer overflow and deal with it.
189  * Used by cz_irq_process(VI).
190  * Returns the value of the wptr.
191  */
192 static u32 tonga_ih_get_wptr(struct amdgpu_device *adev,
193                              struct amdgpu_ih_ring *ih)
194 {
195         u32 wptr, tmp;
196
197         wptr = le32_to_cpu(*ih->wptr_cpu);
198
199         if (!REG_GET_FIELD(wptr, IH_RB_WPTR, RB_OVERFLOW))
200                 goto out;
201
202         /* Double check that the overflow wasn't already cleared. */
203         wptr = RREG32(mmIH_RB_WPTR);
204
205         if (!REG_GET_FIELD(wptr, IH_RB_WPTR, RB_OVERFLOW))
206                 goto out;
207
208         wptr = REG_SET_FIELD(wptr, IH_RB_WPTR, RB_OVERFLOW, 0);
209
210         /* When a ring buffer overflow happen start parsing interrupt
211          * from the last not overwritten vector (wptr + 16). Hopefully
212          * this should allow us to catchup.
213          */
214
215         dev_warn(adev->dev, "IH ring buffer overflow (0x%08X, 0x%08X, 0x%08X)\n",
216                 wptr, ih->rptr, (wptr + 16) & ih->ptr_mask);
217         ih->rptr = (wptr + 16) & ih->ptr_mask;
218         tmp = RREG32(mmIH_RB_CNTL);
219         tmp = REG_SET_FIELD(tmp, IH_RB_CNTL, WPTR_OVERFLOW_CLEAR, 1);
220         WREG32(mmIH_RB_CNTL, tmp);
221
222 out:
223         return (wptr & ih->ptr_mask);
224 }
225
226 /**
227  * tonga_ih_decode_iv - decode an interrupt vector
228  *
229  * @adev: amdgpu_device pointer
230  * @ih: IH ring buffer to decode
231  * @entry: IV entry to place decoded information into
232  *
233  * Decodes the interrupt vector at the current rptr
234  * position and also advance the position.
235  */
236 static void tonga_ih_decode_iv(struct amdgpu_device *adev,
237                                struct amdgpu_ih_ring *ih,
238                                struct amdgpu_iv_entry *entry)
239 {
240         /* wptr/rptr are in bytes! */
241         u32 ring_index = ih->rptr >> 2;
242         uint32_t dw[4];
243
244         dw[0] = le32_to_cpu(ih->ring[ring_index + 0]);
245         dw[1] = le32_to_cpu(ih->ring[ring_index + 1]);
246         dw[2] = le32_to_cpu(ih->ring[ring_index + 2]);
247         dw[3] = le32_to_cpu(ih->ring[ring_index + 3]);
248
249         entry->client_id = AMDGPU_IRQ_CLIENTID_LEGACY;
250         entry->src_id = dw[0] & 0xff;
251         entry->src_data[0] = dw[1] & 0xfffffff;
252         entry->ring_id = dw[2] & 0xff;
253         entry->vmid = (dw[2] >> 8) & 0xff;
254         entry->pasid = (dw[2] >> 16) & 0xffff;
255
256         /* wptr/rptr are in bytes! */
257         ih->rptr += 16;
258 }
259
260 /**
261  * tonga_ih_set_rptr - set the IH ring buffer rptr
262  *
263  * @adev: amdgpu_device pointer
264  * @ih: IH ring buffer to set rptr
265  *
266  * Set the IH ring buffer rptr.
267  */
268 static void tonga_ih_set_rptr(struct amdgpu_device *adev,
269                               struct amdgpu_ih_ring *ih)
270 {
271         if (ih->use_doorbell) {
272                 /* XXX check if swapping is necessary on BE */
273                 *ih->rptr_cpu = ih->rptr;
274                 WDOORBELL32(ih->doorbell_index, ih->rptr);
275         } else {
276                 WREG32(mmIH_RB_RPTR, ih->rptr);
277         }
278 }
279
280 static int tonga_ih_early_init(void *handle)
281 {
282         struct amdgpu_device *adev = (struct amdgpu_device *)handle;
283         int ret;
284
285         ret = amdgpu_irq_add_domain(adev);
286         if (ret)
287                 return ret;
288
289         tonga_ih_set_interrupt_funcs(adev);
290
291         return 0;
292 }
293
294 static int tonga_ih_sw_init(void *handle)
295 {
296         int r;
297         struct amdgpu_device *adev = (struct amdgpu_device *)handle;
298
299         r = amdgpu_ih_ring_init(adev, &adev->irq.ih, 64 * 1024, true);
300         if (r)
301                 return r;
302
303         adev->irq.ih.use_doorbell = true;
304         adev->irq.ih.doorbell_index = adev->doorbell_index.ih;
305
306         r = amdgpu_irq_init(adev);
307
308         return r;
309 }
310
311 static int tonga_ih_sw_fini(void *handle)
312 {
313         struct amdgpu_device *adev = (struct amdgpu_device *)handle;
314
315         amdgpu_irq_fini(adev);
316         amdgpu_ih_ring_fini(adev, &adev->irq.ih);
317         amdgpu_irq_remove_domain(adev);
318
319         return 0;
320 }
321
322 static int tonga_ih_hw_init(void *handle)
323 {
324         int r;
325         struct amdgpu_device *adev = (struct amdgpu_device *)handle;
326
327         r = tonga_ih_irq_init(adev);
328         if (r)
329                 return r;
330
331         return 0;
332 }
333
334 static int tonga_ih_hw_fini(void *handle)
335 {
336         struct amdgpu_device *adev = (struct amdgpu_device *)handle;
337
338         tonga_ih_irq_disable(adev);
339
340         return 0;
341 }
342
343 static int tonga_ih_suspend(void *handle)
344 {
345         struct amdgpu_device *adev = (struct amdgpu_device *)handle;
346
347         return tonga_ih_hw_fini(adev);
348 }
349
350 static int tonga_ih_resume(void *handle)
351 {
352         struct amdgpu_device *adev = (struct amdgpu_device *)handle;
353
354         return tonga_ih_hw_init(adev);
355 }
356
357 static bool tonga_ih_is_idle(void *handle)
358 {
359         struct amdgpu_device *adev = (struct amdgpu_device *)handle;
360         u32 tmp = RREG32(mmSRBM_STATUS);
361
362         if (REG_GET_FIELD(tmp, SRBM_STATUS, IH_BUSY))
363                 return false;
364
365         return true;
366 }
367
368 static int tonga_ih_wait_for_idle(void *handle)
369 {
370         unsigned i;
371         u32 tmp;
372         struct amdgpu_device *adev = (struct amdgpu_device *)handle;
373
374         for (i = 0; i < adev->usec_timeout; i++) {
375                 /* read MC_STATUS */
376                 tmp = RREG32(mmSRBM_STATUS);
377                 if (!REG_GET_FIELD(tmp, SRBM_STATUS, IH_BUSY))
378                         return 0;
379                 udelay(1);
380         }
381         return -ETIMEDOUT;
382 }
383
384 static bool tonga_ih_check_soft_reset(void *handle)
385 {
386         struct amdgpu_device *adev = (struct amdgpu_device *)handle;
387         u32 srbm_soft_reset = 0;
388         u32 tmp = RREG32(mmSRBM_STATUS);
389
390         if (tmp & SRBM_STATUS__IH_BUSY_MASK)
391                 srbm_soft_reset = REG_SET_FIELD(srbm_soft_reset, SRBM_SOFT_RESET,
392                                                 SOFT_RESET_IH, 1);
393
394         if (srbm_soft_reset) {
395                 adev->irq.srbm_soft_reset = srbm_soft_reset;
396                 return true;
397         } else {
398                 adev->irq.srbm_soft_reset = 0;
399                 return false;
400         }
401 }
402
403 static int tonga_ih_pre_soft_reset(void *handle)
404 {
405         struct amdgpu_device *adev = (struct amdgpu_device *)handle;
406
407         if (!adev->irq.srbm_soft_reset)
408                 return 0;
409
410         return tonga_ih_hw_fini(adev);
411 }
412
413 static int tonga_ih_post_soft_reset(void *handle)
414 {
415         struct amdgpu_device *adev = (struct amdgpu_device *)handle;
416
417         if (!adev->irq.srbm_soft_reset)
418                 return 0;
419
420         return tonga_ih_hw_init(adev);
421 }
422
423 static int tonga_ih_soft_reset(void *handle)
424 {
425         struct amdgpu_device *adev = (struct amdgpu_device *)handle;
426         u32 srbm_soft_reset;
427
428         if (!adev->irq.srbm_soft_reset)
429                 return 0;
430         srbm_soft_reset = adev->irq.srbm_soft_reset;
431
432         if (srbm_soft_reset) {
433                 u32 tmp;
434
435                 tmp = RREG32(mmSRBM_SOFT_RESET);
436                 tmp |= srbm_soft_reset;
437                 dev_info(adev->dev, "SRBM_SOFT_RESET=0x%08X\n", tmp);
438                 WREG32(mmSRBM_SOFT_RESET, tmp);
439                 tmp = RREG32(mmSRBM_SOFT_RESET);
440
441                 udelay(50);
442
443                 tmp &= ~srbm_soft_reset;
444                 WREG32(mmSRBM_SOFT_RESET, tmp);
445                 tmp = RREG32(mmSRBM_SOFT_RESET);
446
447                 /* Wait a little for things to settle down */
448                 udelay(50);
449         }
450
451         return 0;
452 }
453
454 static int tonga_ih_set_clockgating_state(void *handle,
455                                           enum amd_clockgating_state state)
456 {
457         return 0;
458 }
459
460 static int tonga_ih_set_powergating_state(void *handle,
461                                           enum amd_powergating_state state)
462 {
463         return 0;
464 }
465
466 static const struct amd_ip_funcs tonga_ih_ip_funcs = {
467         .name = "tonga_ih",
468         .early_init = tonga_ih_early_init,
469         .late_init = NULL,
470         .sw_init = tonga_ih_sw_init,
471         .sw_fini = tonga_ih_sw_fini,
472         .hw_init = tonga_ih_hw_init,
473         .hw_fini = tonga_ih_hw_fini,
474         .suspend = tonga_ih_suspend,
475         .resume = tonga_ih_resume,
476         .is_idle = tonga_ih_is_idle,
477         .wait_for_idle = tonga_ih_wait_for_idle,
478         .check_soft_reset = tonga_ih_check_soft_reset,
479         .pre_soft_reset = tonga_ih_pre_soft_reset,
480         .soft_reset = tonga_ih_soft_reset,
481         .post_soft_reset = tonga_ih_post_soft_reset,
482         .set_clockgating_state = tonga_ih_set_clockgating_state,
483         .set_powergating_state = tonga_ih_set_powergating_state,
484 };
485
486 static const struct amdgpu_ih_funcs tonga_ih_funcs = {
487         .get_wptr = tonga_ih_get_wptr,
488         .decode_iv = tonga_ih_decode_iv,
489         .set_rptr = tonga_ih_set_rptr
490 };
491
492 static void tonga_ih_set_interrupt_funcs(struct amdgpu_device *adev)
493 {
494         adev->irq.ih_funcs = &tonga_ih_funcs;
495 }
496
497 const struct amdgpu_ip_block_version tonga_ih_ip_block =
498 {
499         .type = AMD_IP_BLOCK_TYPE_IH,
500         .major = 3,
501         .minor = 0,
502         .rev = 0,
503         .funcs = &tonga_ih_ip_funcs,
504 };