1
2
3
4
5
6
7
8
9
10
11
12
13#include <linux/clk.h>
14#include <linux/dma-mapping.h>
15#include <linux/err.h>
16#include <linux/interrupt.h>
17#include <linux/kernel.h>
18#include <linux/mailbox_client.h>
19#include <linux/mfd/syscon.h>
20#include <linux/module.h>
21#include <linux/of.h>
22#include <linux/of_device.h>
23#include <linux/of_reserved_mem.h>
24#include <linux/platform_device.h>
25#include <linux/regmap.h>
26#include <linux/remoteproc.h>
27#include <linux/reset.h>
28
29#include "remoteproc_internal.h"
30
31#define ST_RPROC_VQ0 0
32#define ST_RPROC_VQ1 1
33#define ST_RPROC_MAX_VRING 2
34
35#define MBOX_RX 0
36#define MBOX_TX 1
37#define MBOX_MAX 2
38
39struct st_rproc_config {
40 bool sw_reset;
41 bool pwr_reset;
42 unsigned long bootaddr_mask;
43};
44
45struct st_rproc {
46 struct st_rproc_config *config;
47 struct reset_control *sw_reset;
48 struct reset_control *pwr_reset;
49 struct clk *clk;
50 u32 clk_rate;
51 struct regmap *boot_base;
52 u32 boot_offset;
53 struct mbox_chan *mbox_chan[ST_RPROC_MAX_VRING * MBOX_MAX];
54 struct mbox_client mbox_client_vq0;
55 struct mbox_client mbox_client_vq1;
56};
57
58static void st_rproc_mbox_callback(struct device *dev, u32 msg)
59{
60 struct rproc *rproc = dev_get_drvdata(dev);
61
62 if (rproc_vq_interrupt(rproc, msg) == IRQ_NONE)
63 dev_dbg(dev, "no message was found in vqid %d\n", msg);
64}
65
66static
67void st_rproc_mbox_callback_vq0(struct mbox_client *mbox_client, void *data)
68{
69 st_rproc_mbox_callback(mbox_client->dev, 0);
70}
71
72static
73void st_rproc_mbox_callback_vq1(struct mbox_client *mbox_client, void *data)
74{
75 st_rproc_mbox_callback(mbox_client->dev, 1);
76}
77
78static void st_rproc_kick(struct rproc *rproc, int vqid)
79{
80 struct st_rproc *ddata = rproc->priv;
81 struct device *dev = rproc->dev.parent;
82 int ret;
83
84
85 if (WARN_ON(vqid >= ST_RPROC_MAX_VRING))
86 return;
87
88 ret = mbox_send_message(ddata->mbox_chan[vqid * MBOX_MAX + MBOX_TX],
89 (void *)&vqid);
90 if (ret < 0)
91 dev_err(dev, "failed to send message via mbox: %d\n", ret);
92}
93
94static int st_rproc_start(struct rproc *rproc)
95{
96 struct st_rproc *ddata = rproc->priv;
97 int err;
98
99 regmap_update_bits(ddata->boot_base, ddata->boot_offset,
100 ddata->config->bootaddr_mask, rproc->bootaddr);
101
102 err = clk_enable(ddata->clk);
103 if (err) {
104 dev_err(&rproc->dev, "Failed to enable clock\n");
105 return err;
106 }
107
108 if (ddata->config->sw_reset) {
109 err = reset_control_deassert(ddata->sw_reset);
110 if (err) {
111 dev_err(&rproc->dev, "Failed to deassert S/W Reset\n");
112 goto sw_reset_fail;
113 }
114 }
115
116 if (ddata->config->pwr_reset) {
117 err = reset_control_deassert(ddata->pwr_reset);
118 if (err) {
119 dev_err(&rproc->dev, "Failed to deassert Power Reset\n");
120 goto pwr_reset_fail;
121 }
122 }
123
124 dev_info(&rproc->dev, "Started from 0x%x\n", rproc->bootaddr);
125
126 return 0;
127
128
129pwr_reset_fail:
130 if (ddata->config->pwr_reset)
131 reset_control_assert(ddata->sw_reset);
132sw_reset_fail:
133 clk_disable(ddata->clk);
134
135 return err;
136}
137
138static int st_rproc_stop(struct rproc *rproc)
139{
140 struct st_rproc *ddata = rproc->priv;
141 int sw_err = 0, pwr_err = 0;
142
143 if (ddata->config->sw_reset) {
144 sw_err = reset_control_assert(ddata->sw_reset);
145 if (sw_err)
146 dev_err(&rproc->dev, "Failed to assert S/W Reset\n");
147 }
148
149 if (ddata->config->pwr_reset) {
150 pwr_err = reset_control_assert(ddata->pwr_reset);
151 if (pwr_err)
152 dev_err(&rproc->dev, "Failed to assert Power Reset\n");
153 }
154
155 clk_disable(ddata->clk);
156
157 return sw_err ?: pwr_err;
158}
159
160static const struct rproc_ops st_rproc_ops = {
161 .kick = st_rproc_kick,
162 .start = st_rproc_start,
163 .stop = st_rproc_stop,
164};
165
166
167
168
169static int st_rproc_state(struct platform_device *pdev)
170{
171 struct rproc *rproc = platform_get_drvdata(pdev);
172 struct st_rproc *ddata = rproc->priv;
173 int reset_sw = 0, reset_pwr = 0;
174
175 if (ddata->config->sw_reset)
176 reset_sw = reset_control_status(ddata->sw_reset);
177
178 if (ddata->config->pwr_reset)
179 reset_pwr = reset_control_status(ddata->pwr_reset);
180
181 if (reset_sw < 0 || reset_pwr < 0)
182 return -EINVAL;
183
184 return !reset_sw && !reset_pwr;
185}
186
187static const struct st_rproc_config st40_rproc_cfg = {
188 .sw_reset = true,
189 .pwr_reset = true,
190 .bootaddr_mask = GENMASK(28, 1),
191};
192
193static const struct st_rproc_config st231_rproc_cfg = {
194 .sw_reset = true,
195 .pwr_reset = false,
196 .bootaddr_mask = GENMASK(31, 6),
197};
198
199static const struct of_device_id st_rproc_match[] = {
200 { .compatible = "st,st40-rproc", .data = &st40_rproc_cfg },
201 { .compatible = "st,st231-rproc", .data = &st231_rproc_cfg },
202 {},
203};
204MODULE_DEVICE_TABLE(of, st_rproc_match);
205
206static int st_rproc_parse_dt(struct platform_device *pdev)
207{
208 struct device *dev = &pdev->dev;
209 struct rproc *rproc = platform_get_drvdata(pdev);
210 struct st_rproc *ddata = rproc->priv;
211 struct device_node *np = dev->of_node;
212 int err;
213
214 if (ddata->config->sw_reset) {
215 ddata->sw_reset = devm_reset_control_get(dev, "sw_reset");
216 if (IS_ERR(ddata->sw_reset)) {
217 dev_err(dev, "Failed to get S/W Reset\n");
218 return PTR_ERR(ddata->sw_reset);
219 }
220 }
221
222 if (ddata->config->pwr_reset) {
223 ddata->pwr_reset = devm_reset_control_get(dev, "pwr_reset");
224 if (IS_ERR(ddata->pwr_reset)) {
225 dev_err(dev, "Failed to get Power Reset\n");
226 return PTR_ERR(ddata->pwr_reset);
227 }
228 }
229
230 ddata->clk = devm_clk_get(dev, NULL);
231 if (IS_ERR(ddata->clk)) {
232 dev_err(dev, "Failed to get clock\n");
233 return PTR_ERR(ddata->clk);
234 }
235
236 err = of_property_read_u32(np, "clock-frequency", &ddata->clk_rate);
237 if (err) {
238 dev_err(dev, "failed to get clock frequency\n");
239 return err;
240 }
241
242 ddata->boot_base = syscon_regmap_lookup_by_phandle(np, "st,syscfg");
243 if (IS_ERR(ddata->boot_base)) {
244 dev_err(dev, "Boot base not found\n");
245 return PTR_ERR(ddata->boot_base);
246 }
247
248 err = of_property_read_u32_index(np, "st,syscfg", 1,
249 &ddata->boot_offset);
250 if (err) {
251 dev_err(dev, "Boot offset not found\n");
252 return -EINVAL;
253 }
254
255 err = of_reserved_mem_device_init(dev);
256 if (err) {
257 dev_err(dev, "Failed to obtain shared memory\n");
258 return err;
259 }
260
261 err = clk_prepare(ddata->clk);
262 if (err)
263 dev_err(dev, "failed to get clock\n");
264
265 return err;
266}
267
268static int st_rproc_probe(struct platform_device *pdev)
269{
270 struct device *dev = &pdev->dev;
271 const struct of_device_id *match;
272 struct st_rproc *ddata;
273 struct device_node *np = dev->of_node;
274 struct rproc *rproc;
275 struct mbox_chan *chan;
276 int enabled;
277 int ret, i;
278
279 match = of_match_device(st_rproc_match, dev);
280 if (!match || !match->data) {
281 dev_err(dev, "No device match found\n");
282 return -ENODEV;
283 }
284
285 rproc = rproc_alloc(dev, np->name, &st_rproc_ops, NULL, sizeof(*ddata));
286 if (!rproc)
287 return -ENOMEM;
288
289 rproc->has_iommu = false;
290 ddata = rproc->priv;
291 ddata->config = (struct st_rproc_config *)match->data;
292
293 platform_set_drvdata(pdev, rproc);
294
295 ret = st_rproc_parse_dt(pdev);
296 if (ret)
297 goto free_rproc;
298
299 enabled = st_rproc_state(pdev);
300 if (enabled < 0) {
301 ret = enabled;
302 goto free_clk;
303 }
304
305 if (enabled) {
306 atomic_inc(&rproc->power);
307 rproc->state = RPROC_RUNNING;
308 } else {
309 clk_set_rate(ddata->clk, ddata->clk_rate);
310 }
311
312 if (of_get_property(np, "mbox-names", NULL)) {
313 ddata->mbox_client_vq0.dev = dev;
314 ddata->mbox_client_vq0.tx_done = NULL;
315 ddata->mbox_client_vq0.tx_block = false;
316 ddata->mbox_client_vq0.knows_txdone = false;
317 ddata->mbox_client_vq0.rx_callback = st_rproc_mbox_callback_vq0;
318
319 ddata->mbox_client_vq1.dev = dev;
320 ddata->mbox_client_vq1.tx_done = NULL;
321 ddata->mbox_client_vq1.tx_block = false;
322 ddata->mbox_client_vq1.knows_txdone = false;
323 ddata->mbox_client_vq1.rx_callback = st_rproc_mbox_callback_vq1;
324
325
326
327
328
329 chan = mbox_request_channel_byname(&ddata->mbox_client_vq0, "vq0_rx");
330 if (IS_ERR(chan)) {
331 dev_err(&rproc->dev, "failed to request mbox chan 0\n");
332 ret = PTR_ERR(chan);
333 goto free_clk;
334 }
335 ddata->mbox_chan[ST_RPROC_VQ0 * MBOX_MAX + MBOX_RX] = chan;
336
337 chan = mbox_request_channel_byname(&ddata->mbox_client_vq0, "vq0_tx");
338 if (IS_ERR(chan)) {
339 dev_err(&rproc->dev, "failed to request mbox chan 0\n");
340 ret = PTR_ERR(chan);
341 goto free_mbox;
342 }
343 ddata->mbox_chan[ST_RPROC_VQ0 * MBOX_MAX + MBOX_TX] = chan;
344
345 chan = mbox_request_channel_byname(&ddata->mbox_client_vq1, "vq1_rx");
346 if (IS_ERR(chan)) {
347 dev_err(&rproc->dev, "failed to request mbox chan 1\n");
348 ret = PTR_ERR(chan);
349 goto free_mbox;
350 }
351 ddata->mbox_chan[ST_RPROC_VQ1 * MBOX_MAX + MBOX_RX] = chan;
352
353 chan = mbox_request_channel_byname(&ddata->mbox_client_vq1, "vq1_tx");
354 if (IS_ERR(chan)) {
355 dev_err(&rproc->dev, "failed to request mbox chan 1\n");
356 ret = PTR_ERR(chan);
357 goto free_mbox;
358 }
359 ddata->mbox_chan[ST_RPROC_VQ1 * MBOX_MAX + MBOX_TX] = chan;
360 }
361
362 ret = rproc_add(rproc);
363 if (ret)
364 goto free_mbox;
365
366 return 0;
367
368free_mbox:
369 for (i = 0; i < ST_RPROC_MAX_VRING * MBOX_MAX; i++)
370 mbox_free_channel(ddata->mbox_chan[i]);
371free_clk:
372 clk_unprepare(ddata->clk);
373free_rproc:
374 rproc_free(rproc);
375 return ret;
376}
377
378static int st_rproc_remove(struct platform_device *pdev)
379{
380 struct rproc *rproc = platform_get_drvdata(pdev);
381 struct st_rproc *ddata = rproc->priv;
382 int i;
383
384 rproc_del(rproc);
385
386 clk_disable_unprepare(ddata->clk);
387
388 of_reserved_mem_device_release(&pdev->dev);
389
390 for (i = 0; i < ST_RPROC_MAX_VRING * MBOX_MAX; i++)
391 mbox_free_channel(ddata->mbox_chan[i]);
392
393 rproc_free(rproc);
394
395 return 0;
396}
397
398static struct platform_driver st_rproc_driver = {
399 .probe = st_rproc_probe,
400 .remove = st_rproc_remove,
401 .driver = {
402 .name = "st-rproc",
403 .of_match_table = of_match_ptr(st_rproc_match),
404 },
405};
406module_platform_driver(st_rproc_driver);
407
408MODULE_DESCRIPTION("ST Remote Processor Control Driver");
409MODULE_AUTHOR("Ludovic Barre <ludovic.barre@st.com>");
410MODULE_LICENSE("GPL v2");
411
