1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (c) 2018, NVIDIA CORPORATION.
4 */
5
6#include <linux/genalloc.h>
7#include <linux/io.h>
8#include <linux/mailbox_client.h>
9#include <linux/of_address.h>
10#include <linux/platform_device.h>
11
12#include <soc/tegra/bpmp.h>
13#include <soc/tegra/bpmp-abi.h>
14#include <soc/tegra/ivc.h>
15
16#include "bpmp-private.h"
17
18struct tegra186_bpmp {
19 struct tegra_bpmp *parent;
20
21 struct {
22 struct gen_pool *pool;
23 union {
24 void __iomem *sram;
25 void *dram;
26 };
27 dma_addr_t phys;
28 } tx, rx;
29
30 struct {
31 struct mbox_client client;
32 struct mbox_chan *channel;
33 } mbox;
34};
35
36static inline struct tegra_bpmp *
37mbox_client_to_bpmp(struct mbox_client *client)
38{
39 struct tegra186_bpmp *priv;
40
41 priv = container_of(client, struct tegra186_bpmp, mbox.client);
42
43 return priv->parent;
44}
45
46static bool tegra186_bpmp_is_message_ready(struct tegra_bpmp_channel *channel)
47{
48 int err;
49
50 err = tegra_ivc_read_get_next_frame(ivc: channel->ivc, map: &channel->ib);
51 if (err) {
52 iosys_map_clear(map: &channel->ib);
53 return false;
54 }
55
56 return true;
57}
58
59static bool tegra186_bpmp_is_channel_free(struct tegra_bpmp_channel *channel)
60{
61 int err;
62
63 err = tegra_ivc_write_get_next_frame(ivc: channel->ivc, map: &channel->ob);
64 if (err) {
65 iosys_map_clear(map: &channel->ob);
66 return false;
67 }
68
69 return true;
70}
71
72static int tegra186_bpmp_ack_message(struct tegra_bpmp_channel *channel)
73{
74 return tegra_ivc_read_advance(ivc: channel->ivc);
75}
76
77static int tegra186_bpmp_post_message(struct tegra_bpmp_channel *channel)
78{
79 return tegra_ivc_write_advance(ivc: channel->ivc);
80}
81
82static int tegra186_bpmp_ring_doorbell(struct tegra_bpmp *bpmp)
83{
84 struct tegra186_bpmp *priv = bpmp->priv;
85 int err;
86
87 err = mbox_send_message(chan: priv->mbox.channel, NULL);
88 if (err < 0)
89 return err;
90
91 mbox_client_txdone(chan: priv->mbox.channel, r: 0);
92
93 return 0;
94}
95
96static void tegra186_bpmp_ivc_notify(struct tegra_ivc *ivc, void *data)
97{
98 struct tegra_bpmp *bpmp = data;
99 struct tegra186_bpmp *priv = bpmp->priv;
100
101 if (WARN_ON(priv->mbox.channel == NULL))
102 return;
103
104 tegra186_bpmp_ring_doorbell(bpmp);
105}
106
107static int tegra186_bpmp_channel_init(struct tegra_bpmp_channel *channel,
108 struct tegra_bpmp *bpmp,
109 unsigned int index)
110{
111 struct tegra186_bpmp *priv = bpmp->priv;
112 size_t message_size, queue_size;
113 struct iosys_map rx, tx;
114 unsigned int offset;
115 int err;
116
117 channel->ivc = devm_kzalloc(dev: bpmp->dev, size: sizeof(*channel->ivc),
118 GFP_KERNEL);
119 if (!channel->ivc)
120 return -ENOMEM;
121
122 message_size = tegra_ivc_align(MSG_MIN_SZ);
123 queue_size = tegra_ivc_total_queue_size(queue_size: message_size);
124 offset = queue_size * index;
125
126 if (priv->rx.pool) {
127 iosys_map_set_vaddr_iomem(map: &rx, vaddr_iomem: priv->rx.sram + offset);
128 iosys_map_set_vaddr_iomem(map: &tx, vaddr_iomem: priv->tx.sram + offset);
129 } else {
130 iosys_map_set_vaddr(map: &rx, vaddr: priv->rx.dram + offset);
131 iosys_map_set_vaddr(map: &tx, vaddr: priv->tx.dram + offset);
132 }
133
134 err = tegra_ivc_init(ivc: channel->ivc, NULL, rx: &rx, rx_phys: priv->rx.phys + offset, tx: &tx,
135 tx_phys: priv->tx.phys + offset, num_frames: 1, frame_size: message_size, notify: tegra186_bpmp_ivc_notify,
136 data: bpmp);
137 if (err < 0) {
138 dev_err(bpmp->dev, "failed to setup IVC for channel %u: %d\n",
139 index, err);
140 return err;
141 }
142
143 init_completion(x: &channel->completion);
144 channel->bpmp = bpmp;
145
146 return 0;
147}
148
149static void tegra186_bpmp_channel_reset(struct tegra_bpmp_channel *channel)
150{
151 /* reset the channel state */
152 tegra_ivc_reset(ivc: channel->ivc);
153
154 /* sync the channel state with BPMP */
155 while (tegra_ivc_notified(ivc: channel->ivc))
156 ;
157}
158
159static void tegra186_bpmp_channel_cleanup(struct tegra_bpmp_channel *channel)
160{
161 tegra_ivc_cleanup(ivc: channel->ivc);
162}
163
164static void mbox_handle_rx(struct mbox_client *client, void *data)
165{
166 struct tegra_bpmp *bpmp = mbox_client_to_bpmp(client);
167
168 tegra_bpmp_handle_rx(bpmp);
169}
170
171static void tegra186_bpmp_teardown_channels(struct tegra_bpmp *bpmp)
172{
173 struct tegra186_bpmp *priv = bpmp->priv;
174 unsigned int i;
175
176 for (i = 0; i < bpmp->threaded.count; i++) {
177 if (!bpmp->threaded_channels[i].bpmp)
178 continue;
179
180 tegra186_bpmp_channel_cleanup(channel: &bpmp->threaded_channels[i]);
181 }
182
183 tegra186_bpmp_channel_cleanup(channel: bpmp->rx_channel);
184 tegra186_bpmp_channel_cleanup(channel: bpmp->tx_channel);
185
186 if (priv->tx.pool) {
187 gen_pool_free(pool: priv->tx.pool, addr: (unsigned long)priv->tx.sram, size: 4096);
188 gen_pool_free(pool: priv->rx.pool, addr: (unsigned long)priv->rx.sram, size: 4096);
189 }
190}
191
192static int tegra186_bpmp_dram_init(struct tegra_bpmp *bpmp)
193{
194 struct tegra186_bpmp *priv = bpmp->priv;
195 struct device_node *np;
196 struct resource res;
197 size_t size;
198 int err;
199
200 np = of_parse_phandle(np: bpmp->dev->of_node, phandle_name: "memory-region", index: 0);
201 if (!np)
202 return -ENODEV;
203
204 err = of_address_to_resource(dev: np, index: 0, r: &res);
205 if (err < 0) {
206 dev_warn(bpmp->dev, "failed to parse memory region: %d\n", err);
207 return err;
208 }
209
210 size = resource_size(res: &res);
211
212 if (size < SZ_8K) {
213 dev_warn(bpmp->dev, "DRAM region must be larger than 8 KiB\n");
214 return -EINVAL;
215 }
216
217 priv->tx.phys = res.start;
218 priv->rx.phys = res.start + SZ_4K;
219
220 priv->tx.dram = devm_memremap(dev: bpmp->dev, offset: priv->tx.phys, size,
221 flags: MEMREMAP_WC);
222 if (IS_ERR(ptr: priv->tx.dram)) {
223 err = PTR_ERR(ptr: priv->tx.dram);
224 dev_warn(bpmp->dev, "failed to map DRAM region: %d\n", err);
225 return err;
226 }
227
228 priv->rx.dram = priv->tx.dram + SZ_4K;
229
230 return 0;
231}
232
233static int tegra186_bpmp_sram_init(struct tegra_bpmp *bpmp)
234{
235 struct tegra186_bpmp *priv = bpmp->priv;
236 int err;
237
238 priv->tx.pool = of_gen_pool_get(np: bpmp->dev->of_node, propname: "shmem", index: 0);
239 if (!priv->tx.pool) {
240 dev_err(bpmp->dev, "TX shmem pool not found\n");
241 return -EPROBE_DEFER;
242 }
243
244 priv->tx.sram = (void __iomem *)gen_pool_dma_alloc(pool: priv->tx.pool, size: 4096,
245 dma: &priv->tx.phys);
246 if (!priv->tx.sram) {
247 dev_err(bpmp->dev, "failed to allocate from TX pool\n");
248 return -ENOMEM;
249 }
250
251 priv->rx.pool = of_gen_pool_get(np: bpmp->dev->of_node, propname: "shmem", index: 1);
252 if (!priv->rx.pool) {
253 dev_err(bpmp->dev, "RX shmem pool not found\n");
254 err = -EPROBE_DEFER;
255 goto free_tx;
256 }
257
258 priv->rx.sram = (void __iomem *)gen_pool_dma_alloc(pool: priv->rx.pool, size: 4096,
259 dma: &priv->rx.phys);
260 if (!priv->rx.sram) {
261 dev_err(bpmp->dev, "failed to allocate from RX pool\n");
262 err = -ENOMEM;
263 goto free_tx;
264 }
265
266 return 0;
267
268free_tx:
269 gen_pool_free(pool: priv->tx.pool, addr: (unsigned long)priv->tx.sram, size: 4096);
270
271 return err;
272}
273
274static int tegra186_bpmp_setup_channels(struct tegra_bpmp *bpmp)
275{
276 unsigned int i;
277 int err;
278
279 err = tegra186_bpmp_dram_init(bpmp);
280 if (err == -ENODEV) {
281 err = tegra186_bpmp_sram_init(bpmp);
282 if (err < 0)
283 return err;
284 }
285
286 err = tegra186_bpmp_channel_init(channel: bpmp->tx_channel, bpmp,
287 index: bpmp->soc->channels.cpu_tx.offset);
288 if (err < 0)
289 return err;
290
291 err = tegra186_bpmp_channel_init(channel: bpmp->rx_channel, bpmp,
292 index: bpmp->soc->channels.cpu_rx.offset);
293 if (err < 0) {
294 tegra186_bpmp_channel_cleanup(channel: bpmp->tx_channel);
295 return err;
296 }
297
298 for (i = 0; i < bpmp->threaded.count; i++) {
299 unsigned int index = bpmp->soc->channels.thread.offset + i;
300
301 err = tegra186_bpmp_channel_init(channel: &bpmp->threaded_channels[i],
302 bpmp, index);
303 if (err < 0)
304 break;
305 }
306
307 if (err < 0)
308 tegra186_bpmp_teardown_channels(bpmp);
309
310 return err;
311}
312
313static void tegra186_bpmp_reset_channels(struct tegra_bpmp *bpmp)
314{
315 unsigned int i;
316
317 /* reset message channels */
318 tegra186_bpmp_channel_reset(channel: bpmp->tx_channel);
319 tegra186_bpmp_channel_reset(channel: bpmp->rx_channel);
320
321 for (i = 0; i < bpmp->threaded.count; i++)
322 tegra186_bpmp_channel_reset(channel: &bpmp->threaded_channels[i]);
323}
324
325static int tegra186_bpmp_init(struct tegra_bpmp *bpmp)
326{
327 struct tegra186_bpmp *priv;
328 int err;
329
330 priv = devm_kzalloc(dev: bpmp->dev, size: sizeof(*priv), GFP_KERNEL);
331 if (!priv)
332 return -ENOMEM;
333
334 priv->parent = bpmp;
335 bpmp->priv = priv;
336
337 err = tegra186_bpmp_setup_channels(bpmp);
338 if (err < 0)
339 return err;
340
341 /* mbox registration */
342 priv->mbox.client.dev = bpmp->dev;
343 priv->mbox.client.rx_callback = mbox_handle_rx;
344 priv->mbox.client.tx_block = false;
345 priv->mbox.client.knows_txdone = false;
346
347 priv->mbox.channel = mbox_request_channel(cl: &priv->mbox.client, index: 0);
348 if (IS_ERR(ptr: priv->mbox.channel)) {
349 err = PTR_ERR(ptr: priv->mbox.channel);
350 dev_err(bpmp->dev, "failed to get HSP mailbox: %d\n", err);
351 tegra186_bpmp_teardown_channels(bpmp);
352 return err;
353 }
354
355 tegra186_bpmp_reset_channels(bpmp);
356
357 return 0;
358}
359
360static void tegra186_bpmp_deinit(struct tegra_bpmp *bpmp)
361{
362 struct tegra186_bpmp *priv = bpmp->priv;
363
364 mbox_free_channel(chan: priv->mbox.channel);
365
366 tegra186_bpmp_teardown_channels(bpmp);
367}
368
369static int tegra186_bpmp_resume(struct tegra_bpmp *bpmp)
370{
371 tegra186_bpmp_reset_channels(bpmp);
372
373 return 0;
374}
375
376const struct tegra_bpmp_ops tegra186_bpmp_ops = {
377 .init = tegra186_bpmp_init,
378 .deinit = tegra186_bpmp_deinit,
379 .is_response_ready = tegra186_bpmp_is_message_ready,
380 .is_request_ready = tegra186_bpmp_is_message_ready,
381 .ack_response = tegra186_bpmp_ack_message,
382 .ack_request = tegra186_bpmp_ack_message,
383 .is_response_channel_free = tegra186_bpmp_is_channel_free,
384 .is_request_channel_free = tegra186_bpmp_is_channel_free,
385 .post_response = tegra186_bpmp_post_message,
386 .post_request = tegra186_bpmp_post_message,
387 .ring_doorbell = tegra186_bpmp_ring_doorbell,
388 .resume = tegra186_bpmp_resume,
389};
390

source code of linux/drivers/firmware/tegra/bpmp-tegra186.c