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11#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
12
13#include <linux/clk.h>
14#include <linux/cpufreq.h>
15#include <linux/cpu_cooling.h>
16#include <linux/errno.h>
17#include <linux/init.h>
18#include <linux/kernel.h>
19#include <linux/module.h>
20#include <linux/mutex.h>
21#include <linux/of.h>
22#include <linux/slab.h>
23#include <linux/smp.h>
24
25#if !defined(CONFIG_ARM)
26#include <asm/smp.h>
27#endif
28
29
30
31
32
33
34struct cpu_data {
35 struct clk **pclk;
36 struct cpufreq_frequency_table *table;
37 struct thermal_cooling_device *cdev;
38};
39
40
41
42
43
44
45struct soc_data {
46 u32 freq_mask[4];
47 u32 flag;
48};
49
50#define FREQ_MASK 1
51
52static const struct soc_data sdata[] = {
53 {
54 .freq_mask = {0x8, 0x8, 0x2, 0x2},
55 .flag = FREQ_MASK,
56 },
57 {
58 .freq_mask = {0x8, 0x2},
59 .flag = FREQ_MASK,
60 },
61 {
62 .freq_mask = {0},
63 .flag = 0,
64 },
65};
66
67
68
69
70
71
72static u32 min_cpufreq;
73static const u32 *fmask;
74
75#if defined(CONFIG_ARM)
76static int get_cpu_physical_id(int cpu)
77{
78 return topology_core_id(cpu);
79}
80#else
81static int get_cpu_physical_id(int cpu)
82{
83 return get_hard_smp_processor_id(cpu);
84}
85#endif
86
87static u32 get_bus_freq(void)
88{
89 struct device_node *soc;
90 u32 sysfreq;
91
92 soc = of_find_node_by_type(NULL, "soc");
93 if (!soc)
94 return 0;
95
96 if (of_property_read_u32(soc, "bus-frequency", &sysfreq))
97 sysfreq = 0;
98
99 of_node_put(soc);
100
101 return sysfreq;
102}
103
104static struct device_node *cpu_to_clk_node(int cpu)
105{
106 struct device_node *np, *clk_np;
107
108 if (!cpu_present(cpu))
109 return NULL;
110
111 np = of_get_cpu_node(cpu, NULL);
112 if (!np)
113 return NULL;
114
115 clk_np = of_parse_phandle(np, "clocks", 0);
116 if (!clk_np)
117 return NULL;
118
119 of_node_put(np);
120
121 return clk_np;
122}
123
124
125static void set_affected_cpus(struct cpufreq_policy *policy)
126{
127 struct device_node *np, *clk_np;
128 struct cpumask *dstp = policy->cpus;
129 int i;
130
131 np = cpu_to_clk_node(policy->cpu);
132 if (!np)
133 return;
134
135 for_each_present_cpu(i) {
136 clk_np = cpu_to_clk_node(i);
137 if (!clk_np)
138 continue;
139
140 if (clk_np == np)
141 cpumask_set_cpu(i, dstp);
142
143 of_node_put(clk_np);
144 }
145 of_node_put(np);
146}
147
148
149static void freq_table_redup(struct cpufreq_frequency_table *freq_table,
150 int count)
151{
152 int i, j;
153
154 for (i = 1; i < count; i++) {
155 for (j = 0; j < i; j++) {
156 if (freq_table[j].frequency == CPUFREQ_ENTRY_INVALID ||
157 freq_table[j].frequency !=
158 freq_table[i].frequency)
159 continue;
160
161 freq_table[i].frequency = CPUFREQ_ENTRY_INVALID;
162 break;
163 }
164 }
165}
166
167
168static void freq_table_sort(struct cpufreq_frequency_table *freq_table,
169 int count)
170{
171 int i, j, ind;
172 unsigned int freq, max_freq;
173 struct cpufreq_frequency_table table;
174
175 for (i = 0; i < count - 1; i++) {
176 max_freq = freq_table[i].frequency;
177 ind = i;
178 for (j = i + 1; j < count; j++) {
179 freq = freq_table[j].frequency;
180 if (freq == CPUFREQ_ENTRY_INVALID ||
181 freq <= max_freq)
182 continue;
183 ind = j;
184 max_freq = freq;
185 }
186
187 if (ind != i) {
188
189 table.driver_data = freq_table[i].driver_data;
190 table.frequency = freq_table[i].frequency;
191 freq_table[i].driver_data = freq_table[ind].driver_data;
192 freq_table[i].frequency = freq_table[ind].frequency;
193 freq_table[ind].driver_data = table.driver_data;
194 freq_table[ind].frequency = table.frequency;
195 }
196 }
197}
198
199static int qoriq_cpufreq_cpu_init(struct cpufreq_policy *policy)
200{
201 struct device_node *np, *pnode;
202 int i, count, ret;
203 u32 freq, mask;
204 struct clk *clk;
205 struct cpufreq_frequency_table *table;
206 struct cpu_data *data;
207 unsigned int cpu = policy->cpu;
208 u64 u64temp;
209
210 np = of_get_cpu_node(cpu, NULL);
211 if (!np)
212 return -ENODEV;
213
214 data = kzalloc(sizeof(*data), GFP_KERNEL);
215 if (!data)
216 goto err_np;
217
218 policy->clk = of_clk_get(np, 0);
219 if (IS_ERR(policy->clk)) {
220 pr_err("%s: no clock information\n", __func__);
221 goto err_nomem2;
222 }
223
224 pnode = of_parse_phandle(np, "clocks", 0);
225 if (!pnode) {
226 pr_err("%s: could not get clock information\n", __func__);
227 goto err_nomem2;
228 }
229
230 count = of_property_count_strings(pnode, "clock-names");
231 data->pclk = kcalloc(count, sizeof(struct clk *), GFP_KERNEL);
232 if (!data->pclk) {
233 pr_err("%s: no memory\n", __func__);
234 goto err_node;
235 }
236
237 table = kcalloc(count + 1, sizeof(*table), GFP_KERNEL);
238 if (!table) {
239 pr_err("%s: no memory\n", __func__);
240 goto err_pclk;
241 }
242
243 if (fmask)
244 mask = fmask[get_cpu_physical_id(cpu)];
245 else
246 mask = 0x0;
247
248 for (i = 0; i < count; i++) {
249 clk = of_clk_get(pnode, i);
250 data->pclk[i] = clk;
251 freq = clk_get_rate(clk);
252
253
254
255
256 if (freq < min_cpufreq || (mask & (1 << i)))
257 table[i].frequency = CPUFREQ_ENTRY_INVALID;
258 else
259 table[i].frequency = freq / 1000;
260 table[i].driver_data = i;
261 }
262 freq_table_redup(table, count);
263 freq_table_sort(table, count);
264 table[i].frequency = CPUFREQ_TABLE_END;
265
266
267 ret = cpufreq_table_validate_and_show(policy, table);
268 if (ret) {
269 pr_err("invalid frequency table: %d\n", ret);
270 goto err_nomem1;
271 }
272
273 data->table = table;
274
275
276 set_affected_cpus(policy);
277 policy->driver_data = data;
278
279
280 u64temp = 12ULL * NSEC_PER_SEC;
281 do_div(u64temp, get_bus_freq());
282 policy->cpuinfo.transition_latency = u64temp + 1;
283
284 of_node_put(np);
285 of_node_put(pnode);
286
287 return 0;
288
289err_nomem1:
290 kfree(table);
291err_pclk:
292 kfree(data->pclk);
293err_node:
294 of_node_put(pnode);
295err_nomem2:
296 policy->driver_data = NULL;
297 kfree(data);
298err_np:
299 of_node_put(np);
300
301 return -ENODEV;
302}
303
304static int __exit qoriq_cpufreq_cpu_exit(struct cpufreq_policy *policy)
305{
306 struct cpu_data *data = policy->driver_data;
307
308 kfree(data->pclk);
309 kfree(data->table);
310 kfree(data);
311 policy->driver_data = NULL;
312
313 return 0;
314}
315
316static int qoriq_cpufreq_target(struct cpufreq_policy *policy,
317 unsigned int index)
318{
319 struct clk *parent;
320 struct cpu_data *data = policy->driver_data;
321
322 parent = data->pclk[data->table[index].driver_data];
323 return clk_set_parent(policy->clk, parent);
324}
325
326
327static void qoriq_cpufreq_ready(struct cpufreq_policy *policy)
328{
329 struct cpu_data *cpud = policy->driver_data;
330 struct device_node *np = of_get_cpu_node(policy->cpu, NULL);
331
332 if (of_find_property(np, "#cooling-cells", NULL)) {
333 cpud->cdev = of_cpufreq_cooling_register(np,
334 policy->related_cpus);
335
336 if (IS_ERR(cpud->cdev)) {
337 pr_err("Failed to register cooling device cpu%d: %ld\n",
338 policy->cpu, PTR_ERR(cpud->cdev));
339
340 cpud->cdev = NULL;
341 }
342 }
343
344 of_node_put(np);
345}
346
347static struct cpufreq_driver qoriq_cpufreq_driver = {
348 .name = "qoriq_cpufreq",
349 .flags = CPUFREQ_CONST_LOOPS,
350 .init = qoriq_cpufreq_cpu_init,
351 .exit = __exit_p(qoriq_cpufreq_cpu_exit),
352 .verify = cpufreq_generic_frequency_table_verify,
353 .target_index = qoriq_cpufreq_target,
354 .get = cpufreq_generic_get,
355 .ready = qoriq_cpufreq_ready,
356 .attr = cpufreq_generic_attr,
357};
358
359static const struct of_device_id node_matches[] __initconst = {
360 { .compatible = "fsl,p2041-clockgen", .data = &sdata[0], },
361 { .compatible = "fsl,p3041-clockgen", .data = &sdata[0], },
362 { .compatible = "fsl,p5020-clockgen", .data = &sdata[1], },
363 { .compatible = "fsl,p4080-clockgen", .data = &sdata[2], },
364 { .compatible = "fsl,p5040-clockgen", .data = &sdata[2], },
365 { .compatible = "fsl,qoriq-clockgen-2.0", },
366 {}
367};
368
369static int __init qoriq_cpufreq_init(void)
370{
371 int ret;
372 struct device_node *np;
373 const struct of_device_id *match;
374 const struct soc_data *data;
375
376 np = of_find_matching_node(NULL, node_matches);
377 if (!np)
378 return -ENODEV;
379
380 match = of_match_node(node_matches, np);
381 data = match->data;
382 if (data) {
383 if (data->flag)
384 fmask = data->freq_mask;
385 min_cpufreq = get_bus_freq();
386 } else {
387 min_cpufreq = get_bus_freq() / 2;
388 }
389
390 of_node_put(np);
391
392 ret = cpufreq_register_driver(&qoriq_cpufreq_driver);
393 if (!ret)
394 pr_info("Freescale QorIQ CPU frequency scaling driver\n");
395
396 return ret;
397}
398module_init(qoriq_cpufreq_init);
399
400static void __exit qoriq_cpufreq_exit(void)
401{
402 cpufreq_unregister_driver(&qoriq_cpufreq_driver);
403}
404module_exit(qoriq_cpufreq_exit);
405
406MODULE_LICENSE("GPL");
407MODULE_AUTHOR("Tang Yuantian <Yuantian.Tang@freescale.com>");
408MODULE_DESCRIPTION("cpufreq driver for Freescale QorIQ series SoCs");
409
