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14#include <linux/interrupt.h>
15#include <linux/io.h>
16#include <linux/mailbox_controller.h>
17#include <linux/of.h>
18#include <linux/of_device.h>
19#include <linux/platform_device.h>
20#include <linux/slab.h>
21
22#include <dt-bindings/mailbox/tegra186-hsp.h>
23
24#define HSP_INT_DIMENSIONING 0x380
25#define HSP_nSM_SHIFT 0
26#define HSP_nSS_SHIFT 4
27#define HSP_nAS_SHIFT 8
28#define HSP_nDB_SHIFT 12
29#define HSP_nSI_SHIFT 16
30#define HSP_nINT_MASK 0xf
31
32#define HSP_DB_TRIGGER 0x0
33#define HSP_DB_ENABLE 0x4
34#define HSP_DB_RAW 0x8
35#define HSP_DB_PENDING 0xc
36
37#define HSP_DB_CCPLEX 1
38#define HSP_DB_BPMP 3
39#define HSP_DB_MAX 7
40
41struct tegra_hsp_channel;
42struct tegra_hsp;
43
44struct tegra_hsp_channel {
45 struct tegra_hsp *hsp;
46 struct mbox_chan *chan;
47 void __iomem *regs;
48};
49
50struct tegra_hsp_doorbell {
51 struct tegra_hsp_channel channel;
52 struct list_head list;
53 const char *name;
54 unsigned int master;
55 unsigned int index;
56};
57
58struct tegra_hsp_db_map {
59 const char *name;
60 unsigned int master;
61 unsigned int index;
62};
63
64struct tegra_hsp_soc {
65 const struct tegra_hsp_db_map *map;
66};
67
68struct tegra_hsp {
69 const struct tegra_hsp_soc *soc;
70 struct mbox_controller mbox;
71 void __iomem *regs;
72 unsigned int irq;
73 unsigned int num_sm;
74 unsigned int num_as;
75 unsigned int num_ss;
76 unsigned int num_db;
77 unsigned int num_si;
78 spinlock_t lock;
79
80 struct list_head doorbells;
81};
82
83static inline struct tegra_hsp *
84to_tegra_hsp(struct mbox_controller *mbox)
85{
86 return container_of(mbox, struct tegra_hsp, mbox);
87}
88
89static inline u32 tegra_hsp_readl(struct tegra_hsp *hsp, unsigned int offset)
90{
91 return readl(hsp->regs + offset);
92}
93
94static inline void tegra_hsp_writel(struct tegra_hsp *hsp, u32 value,
95 unsigned int offset)
96{
97 writel(value, hsp->regs + offset);
98}
99
100static inline u32 tegra_hsp_channel_readl(struct tegra_hsp_channel *channel,
101 unsigned int offset)
102{
103 return readl(channel->regs + offset);
104}
105
106static inline void tegra_hsp_channel_writel(struct tegra_hsp_channel *channel,
107 u32 value, unsigned int offset)
108{
109 writel(value, channel->regs + offset);
110}
111
112static bool tegra_hsp_doorbell_can_ring(struct tegra_hsp_doorbell *db)
113{
114 u32 value;
115
116 value = tegra_hsp_channel_readl(&db->channel, HSP_DB_ENABLE);
117
118 return (value & BIT(TEGRA_HSP_DB_MASTER_CCPLEX)) != 0;
119}
120
121static struct tegra_hsp_doorbell *
122__tegra_hsp_doorbell_get(struct tegra_hsp *hsp, unsigned int master)
123{
124 struct tegra_hsp_doorbell *entry;
125
126 list_for_each_entry(entry, &hsp->doorbells, list)
127 if (entry->master == master)
128 return entry;
129
130 return NULL;
131}
132
133static struct tegra_hsp_doorbell *
134tegra_hsp_doorbell_get(struct tegra_hsp *hsp, unsigned int master)
135{
136 struct tegra_hsp_doorbell *db;
137 unsigned long flags;
138
139 spin_lock_irqsave(&hsp->lock, flags);
140 db = __tegra_hsp_doorbell_get(hsp, master);
141 spin_unlock_irqrestore(&hsp->lock, flags);
142
143 return db;
144}
145
146static irqreturn_t tegra_hsp_doorbell_irq(int irq, void *data)
147{
148 struct tegra_hsp *hsp = data;
149 struct tegra_hsp_doorbell *db;
150 unsigned long master, value;
151
152 db = tegra_hsp_doorbell_get(hsp, TEGRA_HSP_DB_MASTER_CCPLEX);
153 if (!db)
154 return IRQ_NONE;
155
156 value = tegra_hsp_channel_readl(&db->channel, HSP_DB_PENDING);
157 tegra_hsp_channel_writel(&db->channel, value, HSP_DB_PENDING);
158
159 spin_lock(&hsp->lock);
160
161 for_each_set_bit(master, &value, hsp->mbox.num_chans) {
162 struct tegra_hsp_doorbell *db;
163
164 db = __tegra_hsp_doorbell_get(hsp, master);
165
166
167
168
169
170
171
172
173
174
175
176 if (db && db->channel.chan)
177 mbox_chan_received_data(db->channel.chan, NULL);
178 }
179
180 spin_unlock(&hsp->lock);
181
182 return IRQ_HANDLED;
183}
184
185static struct tegra_hsp_channel *
186tegra_hsp_doorbell_create(struct tegra_hsp *hsp, const char *name,
187 unsigned int master, unsigned int index)
188{
189 struct tegra_hsp_doorbell *db;
190 unsigned int offset;
191 unsigned long flags;
192
193 db = kzalloc(sizeof(*db), GFP_KERNEL);
194 if (!db)
195 return ERR_PTR(-ENOMEM);
196
197 offset = (1 + (hsp->num_sm / 2) + hsp->num_ss + hsp->num_as) << 16;
198 offset += index * 0x100;
199
200 db->channel.regs = hsp->regs + offset;
201 db->channel.hsp = hsp;
202
203 db->name = kstrdup_const(name, GFP_KERNEL);
204 db->master = master;
205 db->index = index;
206
207 spin_lock_irqsave(&hsp->lock, flags);
208 list_add_tail(&db->list, &hsp->doorbells);
209 spin_unlock_irqrestore(&hsp->lock, flags);
210
211 return &db->channel;
212}
213
214static void __tegra_hsp_doorbell_destroy(struct tegra_hsp_doorbell *db)
215{
216 list_del(&db->list);
217 kfree_const(db->name);
218 kfree(db);
219}
220
221static int tegra_hsp_doorbell_send_data(struct mbox_chan *chan, void *data)
222{
223 struct tegra_hsp_doorbell *db = chan->con_priv;
224
225 tegra_hsp_channel_writel(&db->channel, 1, HSP_DB_TRIGGER);
226
227 return 0;
228}
229
230static int tegra_hsp_doorbell_startup(struct mbox_chan *chan)
231{
232 struct tegra_hsp_doorbell *db = chan->con_priv;
233 struct tegra_hsp *hsp = db->channel.hsp;
234 struct tegra_hsp_doorbell *ccplex;
235 unsigned long flags;
236 u32 value;
237
238 if (db->master >= hsp->mbox.num_chans) {
239 dev_err(hsp->mbox.dev,
240 "invalid master ID %u for HSP channel\n",
241 db->master);
242 return -EINVAL;
243 }
244
245 ccplex = tegra_hsp_doorbell_get(hsp, TEGRA_HSP_DB_MASTER_CCPLEX);
246 if (!ccplex)
247 return -ENODEV;
248
249 if (!tegra_hsp_doorbell_can_ring(db))
250 return -ENODEV;
251
252 spin_lock_irqsave(&hsp->lock, flags);
253
254 value = tegra_hsp_channel_readl(&ccplex->channel, HSP_DB_ENABLE);
255 value |= BIT(db->master);
256 tegra_hsp_channel_writel(&ccplex->channel, value, HSP_DB_ENABLE);
257
258 spin_unlock_irqrestore(&hsp->lock, flags);
259
260 return 0;
261}
262
263static void tegra_hsp_doorbell_shutdown(struct mbox_chan *chan)
264{
265 struct tegra_hsp_doorbell *db = chan->con_priv;
266 struct tegra_hsp *hsp = db->channel.hsp;
267 struct tegra_hsp_doorbell *ccplex;
268 unsigned long flags;
269 u32 value;
270
271 ccplex = tegra_hsp_doorbell_get(hsp, TEGRA_HSP_DB_MASTER_CCPLEX);
272 if (!ccplex)
273 return;
274
275 spin_lock_irqsave(&hsp->lock, flags);
276
277 value = tegra_hsp_channel_readl(&ccplex->channel, HSP_DB_ENABLE);
278 value &= ~BIT(db->master);
279 tegra_hsp_channel_writel(&ccplex->channel, value, HSP_DB_ENABLE);
280
281 spin_unlock_irqrestore(&hsp->lock, flags);
282}
283
284static const struct mbox_chan_ops tegra_hsp_doorbell_ops = {
285 .send_data = tegra_hsp_doorbell_send_data,
286 .startup = tegra_hsp_doorbell_startup,
287 .shutdown = tegra_hsp_doorbell_shutdown,
288};
289
290static struct mbox_chan *of_tegra_hsp_xlate(struct mbox_controller *mbox,
291 const struct of_phandle_args *args)
292{
293 struct tegra_hsp_channel *channel = ERR_PTR(-ENODEV);
294 struct tegra_hsp *hsp = to_tegra_hsp(mbox);
295 unsigned int type = args->args[0];
296 unsigned int master = args->args[1];
297 struct tegra_hsp_doorbell *db;
298 struct mbox_chan *chan;
299 unsigned long flags;
300 unsigned int i;
301
302 switch (type) {
303 case TEGRA_HSP_MBOX_TYPE_DB:
304 db = tegra_hsp_doorbell_get(hsp, master);
305 if (db)
306 channel = &db->channel;
307
308 break;
309
310 default:
311 break;
312 }
313
314 if (IS_ERR(channel))
315 return ERR_CAST(channel);
316
317 spin_lock_irqsave(&hsp->lock, flags);
318
319 for (i = 0; i < hsp->mbox.num_chans; i++) {
320 chan = &hsp->mbox.chans[i];
321 if (!chan->con_priv) {
322 chan->con_priv = channel;
323 channel->chan = chan;
324 break;
325 }
326
327 chan = NULL;
328 }
329
330 spin_unlock_irqrestore(&hsp->lock, flags);
331
332 return chan ?: ERR_PTR(-EBUSY);
333}
334
335static void tegra_hsp_remove_doorbells(struct tegra_hsp *hsp)
336{
337 struct tegra_hsp_doorbell *db, *tmp;
338 unsigned long flags;
339
340 spin_lock_irqsave(&hsp->lock, flags);
341
342 list_for_each_entry_safe(db, tmp, &hsp->doorbells, list)
343 __tegra_hsp_doorbell_destroy(db);
344
345 spin_unlock_irqrestore(&hsp->lock, flags);
346}
347
348static int tegra_hsp_add_doorbells(struct tegra_hsp *hsp)
349{
350 const struct tegra_hsp_db_map *map = hsp->soc->map;
351 struct tegra_hsp_channel *channel;
352
353 while (map->name) {
354 channel = tegra_hsp_doorbell_create(hsp, map->name,
355 map->master, map->index);
356 if (IS_ERR(channel)) {
357 tegra_hsp_remove_doorbells(hsp);
358 return PTR_ERR(channel);
359 }
360
361 map++;
362 }
363
364 return 0;
365}
366
367static int tegra_hsp_probe(struct platform_device *pdev)
368{
369 struct tegra_hsp *hsp;
370 struct resource *res;
371 u32 value;
372 int err;
373
374 hsp = devm_kzalloc(&pdev->dev, sizeof(*hsp), GFP_KERNEL);
375 if (!hsp)
376 return -ENOMEM;
377
378 hsp->soc = of_device_get_match_data(&pdev->dev);
379 INIT_LIST_HEAD(&hsp->doorbells);
380 spin_lock_init(&hsp->lock);
381
382 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
383 hsp->regs = devm_ioremap_resource(&pdev->dev, res);
384 if (IS_ERR(hsp->regs))
385 return PTR_ERR(hsp->regs);
386
387 value = tegra_hsp_readl(hsp, HSP_INT_DIMENSIONING);
388 hsp->num_sm = (value >> HSP_nSM_SHIFT) & HSP_nINT_MASK;
389 hsp->num_ss = (value >> HSP_nSS_SHIFT) & HSP_nINT_MASK;
390 hsp->num_as = (value >> HSP_nAS_SHIFT) & HSP_nINT_MASK;
391 hsp->num_db = (value >> HSP_nDB_SHIFT) & HSP_nINT_MASK;
392 hsp->num_si = (value >> HSP_nSI_SHIFT) & HSP_nINT_MASK;
393
394 err = platform_get_irq_byname(pdev, "doorbell");
395 if (err < 0) {
396 dev_err(&pdev->dev, "failed to get doorbell IRQ: %d\n", err);
397 return err;
398 }
399
400 hsp->irq = err;
401
402 hsp->mbox.of_xlate = of_tegra_hsp_xlate;
403 hsp->mbox.num_chans = 32;
404 hsp->mbox.dev = &pdev->dev;
405 hsp->mbox.txdone_irq = false;
406 hsp->mbox.txdone_poll = false;
407 hsp->mbox.ops = &tegra_hsp_doorbell_ops;
408
409 hsp->mbox.chans = devm_kcalloc(&pdev->dev, hsp->mbox.num_chans,
410 sizeof(*hsp->mbox.chans),
411 GFP_KERNEL);
412 if (!hsp->mbox.chans)
413 return -ENOMEM;
414
415 err = tegra_hsp_add_doorbells(hsp);
416 if (err < 0) {
417 dev_err(&pdev->dev, "failed to add doorbells: %d\n", err);
418 return err;
419 }
420
421 platform_set_drvdata(pdev, hsp);
422
423 err = mbox_controller_register(&hsp->mbox);
424 if (err) {
425 dev_err(&pdev->dev, "failed to register mailbox: %d\n", err);
426 tegra_hsp_remove_doorbells(hsp);
427 return err;
428 }
429
430 err = devm_request_irq(&pdev->dev, hsp->irq, tegra_hsp_doorbell_irq,
431 IRQF_NO_SUSPEND, dev_name(&pdev->dev), hsp);
432 if (err < 0) {
433 dev_err(&pdev->dev, "failed to request IRQ#%u: %d\n",
434 hsp->irq, err);
435 return err;
436 }
437
438 return 0;
439}
440
441static int tegra_hsp_remove(struct platform_device *pdev)
442{
443 struct tegra_hsp *hsp = platform_get_drvdata(pdev);
444
445 mbox_controller_unregister(&hsp->mbox);
446 tegra_hsp_remove_doorbells(hsp);
447
448 return 0;
449}
450
451static const struct tegra_hsp_db_map tegra186_hsp_db_map[] = {
452 { "ccplex", TEGRA_HSP_DB_MASTER_CCPLEX, HSP_DB_CCPLEX, },
453 { "bpmp", TEGRA_HSP_DB_MASTER_BPMP, HSP_DB_BPMP, },
454 { }
455};
456
457static const struct tegra_hsp_soc tegra186_hsp_soc = {
458 .map = tegra186_hsp_db_map,
459};
460
461static const struct of_device_id tegra_hsp_match[] = {
462 { .compatible = "nvidia,tegra186-hsp", .data = &tegra186_hsp_soc },
463 { }
464};
465
466static struct platform_driver tegra_hsp_driver = {
467 .driver = {
468 .name = "tegra-hsp",
469 .of_match_table = tegra_hsp_match,
470 },
471 .probe = tegra_hsp_probe,
472 .remove = tegra_hsp_remove,
473};
474
475static int __init tegra_hsp_init(void)
476{
477 return platform_driver_register(&tegra_hsp_driver);
478}
479core_initcall(tegra_hsp_init);
480
