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8#include "common.h"
9
10enum scmi_clock_protocol_cmd {
11 CLOCK_ATTRIBUTES = 0x3,
12 CLOCK_DESCRIBE_RATES = 0x4,
13 CLOCK_RATE_SET = 0x5,
14 CLOCK_RATE_GET = 0x6,
15 CLOCK_CONFIG_SET = 0x7,
16};
17
18struct scmi_msg_resp_clock_protocol_attributes {
19 __le16 num_clocks;
20 u8 max_async_req;
21 u8 reserved;
22};
23
24struct scmi_msg_resp_clock_attributes {
25 __le32 attributes;
26#define CLOCK_ENABLE BIT(0)
27 u8 name[SCMI_MAX_STR_SIZE];
28};
29
30struct scmi_clock_set_config {
31 __le32 id;
32 __le32 attributes;
33};
34
35struct scmi_msg_clock_describe_rates {
36 __le32 id;
37 __le32 rate_index;
38};
39
40struct scmi_msg_resp_clock_describe_rates {
41 __le32 num_rates_flags;
42#define NUM_RETURNED(x) ((x) & 0xfff)
43#define RATE_DISCRETE(x) !((x) & BIT(12))
44#define NUM_REMAINING(x) ((x) >> 16)
45 struct {
46 __le32 value_low;
47 __le32 value_high;
48 } rate[0];
49#define RATE_TO_U64(X) \
50({ \
51 typeof(X) x = (X); \
52 le32_to_cpu((x).value_low) | (u64)le32_to_cpu((x).value_high) << 32; \
53})
54};
55
56struct scmi_clock_set_rate {
57 __le32 flags;
58#define CLOCK_SET_ASYNC BIT(0)
59#define CLOCK_SET_DELAYED BIT(1)
60#define CLOCK_SET_ROUND_UP BIT(2)
61#define CLOCK_SET_ROUND_AUTO BIT(3)
62 __le32 id;
63 __le32 value_low;
64 __le32 value_high;
65};
66
67struct clock_info {
68 int num_clocks;
69 int max_async_req;
70 struct scmi_clock_info *clk;
71};
72
73static int scmi_clock_protocol_attributes_get(const struct scmi_handle *handle,
74 struct clock_info *ci)
75{
76 int ret;
77 struct scmi_xfer *t;
78 struct scmi_msg_resp_clock_protocol_attributes *attr;
79
80 ret = scmi_xfer_get_init(handle, PROTOCOL_ATTRIBUTES,
81 SCMI_PROTOCOL_CLOCK, 0, sizeof(*attr), &t);
82 if (ret)
83 return ret;
84
85 attr = t->rx.buf;
86
87 ret = scmi_do_xfer(handle, t);
88 if (!ret) {
89 ci->num_clocks = le16_to_cpu(attr->num_clocks);
90 ci->max_async_req = attr->max_async_req;
91 }
92
93 scmi_xfer_put(handle, t);
94 return ret;
95}
96
97static int scmi_clock_attributes_get(const struct scmi_handle *handle,
98 u32 clk_id, struct scmi_clock_info *clk)
99{
100 int ret;
101 struct scmi_xfer *t;
102 struct scmi_msg_resp_clock_attributes *attr;
103
104 ret = scmi_xfer_get_init(handle, CLOCK_ATTRIBUTES, SCMI_PROTOCOL_CLOCK,
105 sizeof(clk_id), sizeof(*attr), &t);
106 if (ret)
107 return ret;
108
109 *(__le32 *)t->tx.buf = cpu_to_le32(clk_id);
110 attr = t->rx.buf;
111
112 ret = scmi_do_xfer(handle, t);
113 if (!ret)
114 strlcpy(clk->name, attr->name, SCMI_MAX_STR_SIZE);
115 else
116 clk->name[0] = '\0';
117
118 scmi_xfer_put(handle, t);
119 return ret;
120}
121
122static int
123scmi_clock_describe_rates_get(const struct scmi_handle *handle, u32 clk_id,
124 struct scmi_clock_info *clk)
125{
126 u64 *rate;
127 int ret, cnt;
128 bool rate_discrete = false;
129 u32 tot_rate_cnt = 0, rates_flag;
130 u16 num_returned, num_remaining;
131 struct scmi_xfer *t;
132 struct scmi_msg_clock_describe_rates *clk_desc;
133 struct scmi_msg_resp_clock_describe_rates *rlist;
134
135 ret = scmi_xfer_get_init(handle, CLOCK_DESCRIBE_RATES,
136 SCMI_PROTOCOL_CLOCK, sizeof(*clk_desc), 0, &t);
137 if (ret)
138 return ret;
139
140 clk_desc = t->tx.buf;
141 rlist = t->rx.buf;
142
143 do {
144 clk_desc->id = cpu_to_le32(clk_id);
145
146 clk_desc->rate_index = cpu_to_le32(tot_rate_cnt);
147
148 ret = scmi_do_xfer(handle, t);
149 if (ret)
150 goto err;
151
152 rates_flag = le32_to_cpu(rlist->num_rates_flags);
153 num_remaining = NUM_REMAINING(rates_flag);
154 rate_discrete = RATE_DISCRETE(rates_flag);
155 num_returned = NUM_RETURNED(rates_flag);
156
157 if (tot_rate_cnt + num_returned > SCMI_MAX_NUM_RATES) {
158 dev_err(handle->dev, "No. of rates > MAX_NUM_RATES");
159 break;
160 }
161
162 if (!rate_discrete) {
163 clk->range.min_rate = RATE_TO_U64(rlist->rate[0]);
164 clk->range.max_rate = RATE_TO_U64(rlist->rate[1]);
165 clk->range.step_size = RATE_TO_U64(rlist->rate[2]);
166 dev_dbg(handle->dev, "Min %llu Max %llu Step %llu Hz\n",
167 clk->range.min_rate, clk->range.max_rate,
168 clk->range.step_size);
169 break;
170 }
171
172 rate = &clk->list.rates[tot_rate_cnt];
173 for (cnt = 0; cnt < num_returned; cnt++, rate++) {
174 *rate = RATE_TO_U64(rlist->rate[cnt]);
175 dev_dbg(handle->dev, "Rate %llu Hz\n", *rate);
176 }
177
178 tot_rate_cnt += num_returned;
179
180
181
182
183 } while (num_returned && num_remaining);
184
185 if (rate_discrete)
186 clk->list.num_rates = tot_rate_cnt;
187
188 clk->rate_discrete = rate_discrete;
189
190err:
191 scmi_xfer_put(handle, t);
192 return ret;
193}
194
195static int
196scmi_clock_rate_get(const struct scmi_handle *handle, u32 clk_id, u64 *value)
197{
198 int ret;
199 struct scmi_xfer *t;
200
201 ret = scmi_xfer_get_init(handle, CLOCK_RATE_GET, SCMI_PROTOCOL_CLOCK,
202 sizeof(__le32), sizeof(u64), &t);
203 if (ret)
204 return ret;
205
206 *(__le32 *)t->tx.buf = cpu_to_le32(clk_id);
207
208 ret = scmi_do_xfer(handle, t);
209 if (!ret) {
210 __le32 *pval = t->rx.buf;
211
212 *value = le32_to_cpu(*pval);
213 *value |= (u64)le32_to_cpu(*(pval + 1)) << 32;
214 }
215
216 scmi_xfer_put(handle, t);
217 return ret;
218}
219
220static int scmi_clock_rate_set(const struct scmi_handle *handle, u32 clk_id,
221 u32 config, u64 rate)
222{
223 int ret;
224 struct scmi_xfer *t;
225 struct scmi_clock_set_rate *cfg;
226
227 ret = scmi_xfer_get_init(handle, CLOCK_RATE_SET, SCMI_PROTOCOL_CLOCK,
228 sizeof(*cfg), 0, &t);
229 if (ret)
230 return ret;
231
232 cfg = t->tx.buf;
233 cfg->flags = cpu_to_le32(config);
234 cfg->id = cpu_to_le32(clk_id);
235 cfg->value_low = cpu_to_le32(rate & 0xffffffff);
236 cfg->value_high = cpu_to_le32(rate >> 32);
237
238 ret = scmi_do_xfer(handle, t);
239
240 scmi_xfer_put(handle, t);
241 return ret;
242}
243
244static int
245scmi_clock_config_set(const struct scmi_handle *handle, u32 clk_id, u32 config)
246{
247 int ret;
248 struct scmi_xfer *t;
249 struct scmi_clock_set_config *cfg;
250
251 ret = scmi_xfer_get_init(handle, CLOCK_CONFIG_SET, SCMI_PROTOCOL_CLOCK,
252 sizeof(*cfg), 0, &t);
253 if (ret)
254 return ret;
255
256 cfg = t->tx.buf;
257 cfg->id = cpu_to_le32(clk_id);
258 cfg->attributes = cpu_to_le32(config);
259
260 ret = scmi_do_xfer(handle, t);
261
262 scmi_xfer_put(handle, t);
263 return ret;
264}
265
266static int scmi_clock_enable(const struct scmi_handle *handle, u32 clk_id)
267{
268 return scmi_clock_config_set(handle, clk_id, CLOCK_ENABLE);
269}
270
271static int scmi_clock_disable(const struct scmi_handle *handle, u32 clk_id)
272{
273 return scmi_clock_config_set(handle, clk_id, 0);
274}
275
276static int scmi_clock_count_get(const struct scmi_handle *handle)
277{
278 struct clock_info *ci = handle->clk_priv;
279
280 return ci->num_clocks;
281}
282
283static const struct scmi_clock_info *
284scmi_clock_info_get(const struct scmi_handle *handle, u32 clk_id)
285{
286 struct clock_info *ci = handle->clk_priv;
287 struct scmi_clock_info *clk = ci->clk + clk_id;
288
289 if (!clk->name[0])
290 return NULL;
291
292 return clk;
293}
294
295static struct scmi_clk_ops clk_ops = {
296 .count_get = scmi_clock_count_get,
297 .info_get = scmi_clock_info_get,
298 .rate_get = scmi_clock_rate_get,
299 .rate_set = scmi_clock_rate_set,
300 .enable = scmi_clock_enable,
301 .disable = scmi_clock_disable,
302};
303
304static int scmi_clock_protocol_init(struct scmi_handle *handle)
305{
306 u32 version;
307 int clkid, ret;
308 struct clock_info *cinfo;
309
310 scmi_version_get(handle, SCMI_PROTOCOL_CLOCK, &version);
311
312 dev_dbg(handle->dev, "Clock Version %d.%d\n",
313 PROTOCOL_REV_MAJOR(version), PROTOCOL_REV_MINOR(version));
314
315 cinfo = devm_kzalloc(handle->dev, sizeof(*cinfo), GFP_KERNEL);
316 if (!cinfo)
317 return -ENOMEM;
318
319 scmi_clock_protocol_attributes_get(handle, cinfo);
320
321 cinfo->clk = devm_kcalloc(handle->dev, cinfo->num_clocks,
322 sizeof(*cinfo->clk), GFP_KERNEL);
323 if (!cinfo->clk)
324 return -ENOMEM;
325
326 for (clkid = 0; clkid < cinfo->num_clocks; clkid++) {
327 struct scmi_clock_info *clk = cinfo->clk + clkid;
328
329 ret = scmi_clock_attributes_get(handle, clkid, clk);
330 if (!ret)
331 scmi_clock_describe_rates_get(handle, clkid, clk);
332 }
333
334 handle->clk_ops = &clk_ops;
335 handle->clk_priv = cinfo;
336
337 return 0;
338}
339
340static int __init scmi_clock_init(void)
341{
342 return scmi_protocol_register(SCMI_PROTOCOL_CLOCK,
343 &scmi_clock_protocol_init);
344}
345subsys_initcall(scmi_clock_init);
346
