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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (c) 2018, The Linux Foundation. All rights reserved.
4 */
5
6#include <linux/bitfield.h>
7#include <linux/cpufreq.h>
8#include <linux/init.h>
9#include <linux/interconnect.h>
10#include <linux/kernel.h>
11#include <linux/module.h>
12#include <linux/of_address.h>
13#include <linux/of_platform.h>
14#include <linux/pm_opp.h>
15#include <linux/slab.h>
16
17#define LUT_MAX_ENTRIES 40U
18#define LUT_SRC GENMASK(31, 30)
19#define LUT_L_VAL GENMASK(7, 0)
20#define LUT_CORE_COUNT GENMASK(18, 16)
21#define LUT_VOLT GENMASK(11, 0)
22#define LUT_ROW_SIZE 32
23#define CLK_HW_DIV 2
24#define LUT_TURBO_IND 1
25
26/* Register offsets */
27#define REG_ENABLE 0x0
28#define REG_FREQ_LUT 0x110
29#define REG_VOLT_LUT 0x114
30#define REG_PERF_STATE 0x920
31
32static unsigned long cpu_hw_rate, xo_rate;
33static struct platform_device *global_pdev;
34static bool icc_scaling_enabled;
35
36static int qcom_cpufreq_set_bw(struct cpufreq_policy *policy,
37 unsigned long freq_khz)
38{
39 unsigned long freq_hz = freq_khz * 1000;
40 struct dev_pm_opp *opp;
41 struct device *dev;
42 int ret;
43
44 dev = get_cpu_device(policy->cpu);
45 if (!dev)
46 return -ENODEV;
47
48 opp = dev_pm_opp_find_freq_exact(dev, freq_hz, true);
49 if (IS_ERR(opp))
50 return PTR_ERR(opp);
51
52 ret = dev_pm_opp_set_bw(dev, opp);
53 dev_pm_opp_put(opp);
54 return ret;
55}
56
57static int qcom_cpufreq_update_opp(struct device *cpu_dev,
58 unsigned long freq_khz,
59 unsigned long volt)
60{
61 unsigned long freq_hz = freq_khz * 1000;
62 int ret;
63
64 /* Skip voltage update if the opp table is not available */
65 if (!icc_scaling_enabled)
66 return dev_pm_opp_add(cpu_dev, freq_hz, volt);
67
68 ret = dev_pm_opp_adjust_voltage(cpu_dev, freq_hz, volt, volt, volt);
69 if (ret) {
70 dev_err(cpu_dev, "Voltage update failed freq=%ld\n", freq_khz);
71 return ret;
72 }
73
74 return dev_pm_opp_enable(cpu_dev, freq_hz);
75}
76
77static int qcom_cpufreq_hw_target_index(struct cpufreq_policy *policy,
78 unsigned int index)
79{
80 void __iomem *perf_state_reg = policy->driver_data;
81 unsigned long freq = policy->freq_table[index].frequency;
82
83 writel_relaxed(index, perf_state_reg);
84
85 if (icc_scaling_enabled)
86 qcom_cpufreq_set_bw(policy, freq);
87
88 arch_set_freq_scale(policy->related_cpus, freq,
89 policy->cpuinfo.max_freq);
90 return 0;
91}
92
93static unsigned int qcom_cpufreq_hw_get(unsigned int cpu)
94{
95 void __iomem *perf_state_reg;
96 struct cpufreq_policy *policy;
97 unsigned int index;
98
99 policy = cpufreq_cpu_get_raw(cpu);
100 if (!policy)
101 return 0;
102
103 perf_state_reg = policy->driver_data;
104
105 index = readl_relaxed(perf_state_reg);
106 index = min(index, LUT_MAX_ENTRIES - 1);
107
108 return policy->freq_table[index].frequency;
109}
110
111static unsigned int qcom_cpufreq_hw_fast_switch(struct cpufreq_policy *policy,
112 unsigned int target_freq)
113{
114 void __iomem *perf_state_reg = policy->driver_data;
115 unsigned int index;
116 unsigned long freq;
117
118 index = policy->cached_resolved_idx;
119 writel_relaxed(index, perf_state_reg);
120
121 freq = policy->freq_table[index].frequency;
122 arch_set_freq_scale(policy->related_cpus, freq,
123 policy->cpuinfo.max_freq);
124
125 return freq;
126}
127
128static int qcom_cpufreq_hw_read_lut(struct device *cpu_dev,
129 struct cpufreq_policy *policy,
130 void __iomem *base)
131{
132 u32 data, src, lval, i, core_count, prev_freq = 0, freq;
133 u32 volt;
134 struct cpufreq_frequency_table *table;
135 struct dev_pm_opp *opp;
136 unsigned long rate;
137 int ret;
138
139 table = kcalloc(LUT_MAX_ENTRIES + 1, sizeof(*table), GFP_KERNEL);
140 if (!table)
141 return -ENOMEM;
142
143 ret = dev_pm_opp_of_add_table(cpu_dev);
144 if (!ret) {
145 /* Disable all opps and cross-validate against LUT later */
146 icc_scaling_enabled = true;
147 for (rate = 0; ; rate++) {
148 opp = dev_pm_opp_find_freq_ceil(cpu_dev, &rate);
149 if (IS_ERR(opp))
150 break;
151
152 dev_pm_opp_put(opp);
153 dev_pm_opp_disable(cpu_dev, rate);
154 }
155 } else if (ret != -ENODEV) {
156 dev_err(cpu_dev, "Invalid opp table in device tree\n");
157 return ret;
158 } else {
159 policy->fast_switch_possible = true;
160 icc_scaling_enabled = false;
161 }
162
163 for (i = 0; i < LUT_MAX_ENTRIES; i++) {
164 data = readl_relaxed(base + REG_FREQ_LUT +
165 i * LUT_ROW_SIZE);
166 src = FIELD_GET(LUT_SRC, data);
167 lval = FIELD_GET(LUT_L_VAL, data);
168 core_count = FIELD_GET(LUT_CORE_COUNT, data);
169
170 data = readl_relaxed(base + REG_VOLT_LUT +
171 i * LUT_ROW_SIZE);
172 volt = FIELD_GET(LUT_VOLT, data) * 1000;
173
174 if (src)
175 freq = xo_rate * lval / 1000;
176 else
177 freq = cpu_hw_rate / 1000;
178
179 if (freq != prev_freq && core_count != LUT_TURBO_IND) {
180 table[i].frequency = freq;
181 qcom_cpufreq_update_opp(cpu_dev, freq, volt);
182 dev_dbg(cpu_dev, "index=%d freq=%d, core_count %d\n", i,
183 freq, core_count);
184 } else if (core_count == LUT_TURBO_IND) {
185 table[i].frequency = CPUFREQ_ENTRY_INVALID;
186 }
187
188 /*
189 * Two of the same frequencies with the same core counts means
190 * end of table
191 */
192 if (i > 0 && prev_freq == freq) {
193 struct cpufreq_frequency_table *prev = &table[i - 1];
194
195 /*
196 * Only treat the last frequency that might be a boost
197 * as the boost frequency
198 */
199 if (prev->frequency == CPUFREQ_ENTRY_INVALID) {
200 prev->frequency = prev_freq;
201 prev->flags = CPUFREQ_BOOST_FREQ;
202 qcom_cpufreq_update_opp(cpu_dev, prev_freq, volt);
203 }
204
205 break;
206 }
207
208 prev_freq = freq;
209 }
210
211 table[i].frequency = CPUFREQ_TABLE_END;
212 policy->freq_table = table;
213 dev_pm_opp_set_sharing_cpus(cpu_dev, policy->cpus);
214
215 return 0;
216}
217
218static void qcom_get_related_cpus(int index, struct cpumask *m)
219{
220 struct device_node *cpu_np;
221 struct of_phandle_args args;
222 int cpu, ret;
223
224 for_each_possible_cpu(cpu) {
225 cpu_np = of_cpu_device_node_get(cpu);
226 if (!cpu_np)
227 continue;
228
229 ret = of_parse_phandle_with_args(cpu_np, "qcom,freq-domain",
230 "#freq-domain-cells", 0,
231 &args);
232 of_node_put(cpu_np);
233 if (ret < 0)
234 continue;
235
236 if (index == args.args[0])
237 cpumask_set_cpu(cpu, m);
238 }
239}
240
241static int qcom_cpufreq_hw_cpu_init(struct cpufreq_policy *policy)
242{
243 struct device *dev = &global_pdev->dev;
244 struct of_phandle_args args;
245 struct device_node *cpu_np;
246 struct device *cpu_dev;
247 struct resource *res;
248 void __iomem *base;
249 int ret, index;
250
251 cpu_dev = get_cpu_device(policy->cpu);
252 if (!cpu_dev) {
253 pr_err("%s: failed to get cpu%d device\n", __func__,
254 policy->cpu);
255 return -ENODEV;
256 }
257
258 cpu_np = of_cpu_device_node_get(policy->cpu);
259 if (!cpu_np)
260 return -EINVAL;
261
262 ret = of_parse_phandle_with_args(cpu_np, "qcom,freq-domain",
263 "#freq-domain-cells", 0, &args);
264 of_node_put(cpu_np);
265 if (ret)
266 return ret;
267
268 index = args.args[0];
269
270 res = platform_get_resource(global_pdev, IORESOURCE_MEM, index);
271 if (!res)
272 return -ENODEV;
273
274 base = devm_ioremap(dev, res->start, resource_size(res));
275 if (!base)
276 return -ENOMEM;
277
278 /* HW should be in enabled state to proceed */
279 if (!(readl_relaxed(base + REG_ENABLE) & 0x1)) {
280 dev_err(dev, "Domain-%d cpufreq hardware not enabled\n", index);
281 ret = -ENODEV;
282 goto error;
283 }
284
285 qcom_get_related_cpus(index, policy->cpus);
286 if (!cpumask_weight(policy->cpus)) {
287 dev_err(dev, "Domain-%d failed to get related CPUs\n", index);
288 ret = -ENOENT;
289 goto error;
290 }
291
292 policy->driver_data = base + REG_PERF_STATE;
293
294 ret = qcom_cpufreq_hw_read_lut(cpu_dev, policy, base);
295 if (ret) {
296 dev_err(dev, "Domain-%d failed to read LUT\n", index);
297 goto error;
298 }
299
300 ret = dev_pm_opp_get_opp_count(cpu_dev);
301 if (ret <= 0) {
302 dev_err(cpu_dev, "Failed to add OPPs\n");
303 ret = -ENODEV;
304 goto error;
305 }
306
307 dev_pm_opp_of_register_em(cpu_dev, policy->cpus);
308
309 return 0;
310error:
311 devm_iounmap(dev, base);
312 return ret;
313}
314
315static int qcom_cpufreq_hw_cpu_exit(struct cpufreq_policy *policy)
316{
317 struct device *cpu_dev = get_cpu_device(policy->cpu);
318 void __iomem *base = policy->driver_data - REG_PERF_STATE;
319
320 dev_pm_opp_remove_all_dynamic(cpu_dev);
321 dev_pm_opp_of_cpumask_remove_table(policy->related_cpus);
322 kfree(policy->freq_table);
323 devm_iounmap(&global_pdev->dev, base);
324
325 return 0;
326}
327
328static struct freq_attr *qcom_cpufreq_hw_attr[] = {
329 &cpufreq_freq_attr_scaling_available_freqs,
330 &cpufreq_freq_attr_scaling_boost_freqs,
331 NULL
332};
333
334static struct cpufreq_driver cpufreq_qcom_hw_driver = {
335 .flags = CPUFREQ_STICKY | CPUFREQ_NEED_INITIAL_FREQ_CHECK |
336 CPUFREQ_HAVE_GOVERNOR_PER_POLICY |
337 CPUFREQ_IS_COOLING_DEV,
338 .verify = cpufreq_generic_frequency_table_verify,
339 .target_index = qcom_cpufreq_hw_target_index,
340 .get = qcom_cpufreq_hw_get,
341 .init = qcom_cpufreq_hw_cpu_init,
342 .exit = qcom_cpufreq_hw_cpu_exit,
343 .fast_switch = qcom_cpufreq_hw_fast_switch,
344 .name = "qcom-cpufreq-hw",
345 .attr = qcom_cpufreq_hw_attr,
346};
347
348static int qcom_cpufreq_hw_driver_probe(struct platform_device *pdev)
349{
350 struct device *cpu_dev;
351 struct clk *clk;
352 int ret;
353
354 clk = clk_get(&pdev->dev, "xo");
355 if (IS_ERR(clk))
356 return PTR_ERR(clk);
357
358 xo_rate = clk_get_rate(clk);
359 clk_put(clk);
360
361 clk = clk_get(&pdev->dev, "alternate");
362 if (IS_ERR(clk))
363 return PTR_ERR(clk);
364
365 cpu_hw_rate = clk_get_rate(clk) / CLK_HW_DIV;
366 clk_put(clk);
367
368 global_pdev = pdev;
369
370 /* Check for optional interconnect paths on CPU0 */
371 cpu_dev = get_cpu_device(0);
372 if (!cpu_dev)
373 return -EPROBE_DEFER;
374
375 ret = dev_pm_opp_of_find_icc_paths(cpu_dev, NULL);
376 if (ret)
377 return ret;
378
379 ret = cpufreq_register_driver(&cpufreq_qcom_hw_driver);
380 if (ret)
381 dev_err(&pdev->dev, "CPUFreq HW driver failed to register\n");
382 else
383 dev_dbg(&pdev->dev, "QCOM CPUFreq HW driver initialized\n");
384
385 return ret;
386}
387
388static int qcom_cpufreq_hw_driver_remove(struct platform_device *pdev)
389{
390 return cpufreq_unregister_driver(&cpufreq_qcom_hw_driver);
391}
392
393static const struct of_device_id qcom_cpufreq_hw_match[] = {
394 { .compatible = "qcom,cpufreq-hw" },
395 {}
396};
397MODULE_DEVICE_TABLE(of, qcom_cpufreq_hw_match);
398
399static struct platform_driver qcom_cpufreq_hw_driver = {
400 .probe = qcom_cpufreq_hw_driver_probe,
401 .remove = qcom_cpufreq_hw_driver_remove,
402 .driver = {
403 .name = "qcom-cpufreq-hw",
404 .of_match_table = qcom_cpufreq_hw_match,
405 },
406};
407
408static int __init qcom_cpufreq_hw_init(void)
409{
410 return platform_driver_register(&qcom_cpufreq_hw_driver);
411}
412postcore_initcall(qcom_cpufreq_hw_init);
413
414static void __exit qcom_cpufreq_hw_exit(void)
415{
416 platform_driver_unregister(&qcom_cpufreq_hw_driver);
417}
418module_exit(qcom_cpufreq_hw_exit);
419
420MODULE_DESCRIPTION("QCOM CPUFREQ HW Driver");
421MODULE_LICENSE("GPL v2");
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (c) 2018, The Linux Foundation. All rights reserved.
4 */
5
6#include <linux/bitfield.h>
7#include <linux/clk-provider.h>
8#include <linux/cpufreq.h>
9#include <linux/init.h>
10#include <linux/interconnect.h>
11#include <linux/interrupt.h>
12#include <linux/kernel.h>
13#include <linux/module.h>
14#include <linux/of_address.h>
15#include <linux/of_platform.h>
16#include <linux/pm_opp.h>
17#include <linux/pm_qos.h>
18#include <linux/slab.h>
19#include <linux/spinlock.h>
20#include <linux/units.h>
21
22#define LUT_MAX_ENTRIES 40U
23#define LUT_SRC GENMASK(31, 30)
24#define LUT_L_VAL GENMASK(7, 0)
25#define LUT_CORE_COUNT GENMASK(18, 16)
26#define LUT_VOLT GENMASK(11, 0)
27#define CLK_HW_DIV 2
28#define LUT_TURBO_IND 1
29
30#define GT_IRQ_STATUS BIT(2)
31
32struct qcom_cpufreq_soc_data {
33 u32 reg_enable;
34 u32 reg_domain_state;
35 u32 reg_dcvs_ctrl;
36 u32 reg_freq_lut;
37 u32 reg_volt_lut;
38 u32 reg_intr_clr;
39 u32 reg_current_vote;
40 u32 reg_perf_state;
41 u8 lut_row_size;
42};
43
44struct qcom_cpufreq_data {
45 void __iomem *base;
46 struct resource *res;
47
48 /*
49 * Mutex to synchronize between de-init sequence and re-starting LMh
50 * polling/interrupts
51 */
52 struct mutex throttle_lock;
53 int throttle_irq;
54 char irq_name[15];
55 bool cancel_throttle;
56 struct delayed_work throttle_work;
57 struct cpufreq_policy *policy;
58 struct clk_hw cpu_clk;
59
60 bool per_core_dcvs;
61
62 struct freq_qos_request throttle_freq_req;
63};
64
65static struct {
66 struct qcom_cpufreq_data *data;
67 const struct qcom_cpufreq_soc_data *soc_data;
68} qcom_cpufreq;
69
70static unsigned long cpu_hw_rate, xo_rate;
71static bool icc_scaling_enabled;
72
73static int qcom_cpufreq_set_bw(struct cpufreq_policy *policy,
74 unsigned long freq_khz)
75{
76 unsigned long freq_hz = freq_khz * 1000;
77 struct dev_pm_opp *opp;
78 struct device *dev;
79 int ret;
80
81 dev = get_cpu_device(policy->cpu);
82 if (!dev)
83 return -ENODEV;
84
85 opp = dev_pm_opp_find_freq_exact(dev, freq_hz, true);
86 if (IS_ERR(opp))
87 return PTR_ERR(opp);
88
89 ret = dev_pm_opp_set_opp(dev, opp);
90 dev_pm_opp_put(opp);
91 return ret;
92}
93
94static int qcom_cpufreq_update_opp(struct device *cpu_dev,
95 unsigned long freq_khz,
96 unsigned long volt)
97{
98 unsigned long freq_hz = freq_khz * 1000;
99 int ret;
100
101 /* Skip voltage update if the opp table is not available */
102 if (!icc_scaling_enabled)
103 return dev_pm_opp_add(cpu_dev, freq_hz, volt);
104
105 ret = dev_pm_opp_adjust_voltage(cpu_dev, freq_hz, volt, volt, volt);
106 if (ret) {
107 dev_err(cpu_dev, "Voltage update failed freq=%ld\n", freq_khz);
108 return ret;
109 }
110
111 return dev_pm_opp_enable(cpu_dev, freq_hz);
112}
113
114static int qcom_cpufreq_hw_target_index(struct cpufreq_policy *policy,
115 unsigned int index)
116{
117 struct qcom_cpufreq_data *data = policy->driver_data;
118 const struct qcom_cpufreq_soc_data *soc_data = qcom_cpufreq.soc_data;
119 unsigned long freq = policy->freq_table[index].frequency;
120 unsigned int i;
121
122 writel_relaxed(index, data->base + soc_data->reg_perf_state);
123
124 if (data->per_core_dcvs)
125 for (i = 1; i < cpumask_weight(policy->related_cpus); i++)
126 writel_relaxed(index, data->base + soc_data->reg_perf_state + i * 4);
127
128 if (icc_scaling_enabled)
129 qcom_cpufreq_set_bw(policy, freq);
130
131 return 0;
132}
133
134static unsigned long qcom_lmh_get_throttle_freq(struct qcom_cpufreq_data *data)
135{
136 unsigned int lval;
137
138 if (qcom_cpufreq.soc_data->reg_current_vote)
139 lval = readl_relaxed(data->base + qcom_cpufreq.soc_data->reg_current_vote) & 0x3ff;
140 else
141 lval = readl_relaxed(data->base + qcom_cpufreq.soc_data->reg_domain_state) & 0xff;
142
143 return lval * xo_rate;
144}
145
146/* Get the frequency requested by the cpufreq core for the CPU */
147static unsigned int qcom_cpufreq_get_freq(unsigned int cpu)
148{
149 struct qcom_cpufreq_data *data;
150 const struct qcom_cpufreq_soc_data *soc_data;
151 struct cpufreq_policy *policy;
152 unsigned int index;
153
154 policy = cpufreq_cpu_get_raw(cpu);
155 if (!policy)
156 return 0;
157
158 data = policy->driver_data;
159 soc_data = qcom_cpufreq.soc_data;
160
161 index = readl_relaxed(data->base + soc_data->reg_perf_state);
162 index = min(index, LUT_MAX_ENTRIES - 1);
163
164 return policy->freq_table[index].frequency;
165}
166
167static unsigned int qcom_cpufreq_hw_get(unsigned int cpu)
168{
169 struct qcom_cpufreq_data *data;
170 struct cpufreq_policy *policy;
171
172 policy = cpufreq_cpu_get_raw(cpu);
173 if (!policy)
174 return 0;
175
176 data = policy->driver_data;
177
178 if (data->throttle_irq >= 0)
179 return qcom_lmh_get_throttle_freq(data) / HZ_PER_KHZ;
180
181 return qcom_cpufreq_get_freq(cpu);
182}
183
184static unsigned int qcom_cpufreq_hw_fast_switch(struct cpufreq_policy *policy,
185 unsigned int target_freq)
186{
187 struct qcom_cpufreq_data *data = policy->driver_data;
188 const struct qcom_cpufreq_soc_data *soc_data = qcom_cpufreq.soc_data;
189 unsigned int index;
190 unsigned int i;
191
192 index = policy->cached_resolved_idx;
193 writel_relaxed(index, data->base + soc_data->reg_perf_state);
194
195 if (data->per_core_dcvs)
196 for (i = 1; i < cpumask_weight(policy->related_cpus); i++)
197 writel_relaxed(index, data->base + soc_data->reg_perf_state + i * 4);
198
199 return policy->freq_table[index].frequency;
200}
201
202static int qcom_cpufreq_hw_read_lut(struct device *cpu_dev,
203 struct cpufreq_policy *policy)
204{
205 u32 data, src, lval, i, core_count, prev_freq = 0, freq;
206 u32 volt;
207 struct cpufreq_frequency_table *table;
208 struct dev_pm_opp *opp;
209 unsigned long rate;
210 int ret;
211 struct qcom_cpufreq_data *drv_data = policy->driver_data;
212 const struct qcom_cpufreq_soc_data *soc_data = qcom_cpufreq.soc_data;
213
214 table = kcalloc(LUT_MAX_ENTRIES + 1, sizeof(*table), GFP_KERNEL);
215 if (!table)
216 return -ENOMEM;
217
218 ret = dev_pm_opp_of_add_table(cpu_dev);
219 if (!ret) {
220 /* Disable all opps and cross-validate against LUT later */
221 icc_scaling_enabled = true;
222 for (rate = 0; ; rate++) {
223 opp = dev_pm_opp_find_freq_ceil(cpu_dev, &rate);
224 if (IS_ERR(opp))
225 break;
226
227 dev_pm_opp_put(opp);
228 dev_pm_opp_disable(cpu_dev, rate);
229 }
230 } else if (ret != -ENODEV) {
231 dev_err(cpu_dev, "Invalid opp table in device tree\n");
232 kfree(table);
233 return ret;
234 } else {
235 policy->fast_switch_possible = true;
236 icc_scaling_enabled = false;
237 }
238
239 for (i = 0; i < LUT_MAX_ENTRIES; i++) {
240 data = readl_relaxed(drv_data->base + soc_data->reg_freq_lut +
241 i * soc_data->lut_row_size);
242 src = FIELD_GET(LUT_SRC, data);
243 lval = FIELD_GET(LUT_L_VAL, data);
244 core_count = FIELD_GET(LUT_CORE_COUNT, data);
245
246 data = readl_relaxed(drv_data->base + soc_data->reg_volt_lut +
247 i * soc_data->lut_row_size);
248 volt = FIELD_GET(LUT_VOLT, data) * 1000;
249
250 if (src)
251 freq = xo_rate * lval / 1000;
252 else
253 freq = cpu_hw_rate / 1000;
254
255 if (freq != prev_freq && core_count != LUT_TURBO_IND) {
256 if (!qcom_cpufreq_update_opp(cpu_dev, freq, volt)) {
257 table[i].frequency = freq;
258 dev_dbg(cpu_dev, "index=%d freq=%d, core_count %d\n", i,
259 freq, core_count);
260 } else {
261 dev_warn(cpu_dev, "failed to update OPP for freq=%d\n", freq);
262 table[i].frequency = CPUFREQ_ENTRY_INVALID;
263 }
264
265 } else if (core_count == LUT_TURBO_IND) {
266 table[i].frequency = CPUFREQ_ENTRY_INVALID;
267 }
268
269 /*
270 * Two of the same frequencies with the same core counts means
271 * end of table
272 */
273 if (i > 0 && prev_freq == freq) {
274 struct cpufreq_frequency_table *prev = &table[i - 1];
275
276 /*
277 * Only treat the last frequency that might be a boost
278 * as the boost frequency
279 */
280 if (prev->frequency == CPUFREQ_ENTRY_INVALID) {
281 if (!qcom_cpufreq_update_opp(cpu_dev, prev_freq, volt)) {
282 prev->frequency = prev_freq;
283 prev->flags = CPUFREQ_BOOST_FREQ;
284 } else {
285 dev_warn(cpu_dev, "failed to update OPP for freq=%d\n",
286 freq);
287 }
288 }
289
290 break;
291 }
292
293 prev_freq = freq;
294 }
295
296 table[i].frequency = CPUFREQ_TABLE_END;
297 policy->freq_table = table;
298 dev_pm_opp_set_sharing_cpus(cpu_dev, policy->cpus);
299
300 return 0;
301}
302
303static void qcom_get_related_cpus(int index, struct cpumask *m)
304{
305 struct device_node *cpu_np;
306 struct of_phandle_args args;
307 int cpu, ret;
308
309 for_each_possible_cpu(cpu) {
310 cpu_np = of_cpu_device_node_get(cpu);
311 if (!cpu_np)
312 continue;
313
314 ret = of_parse_phandle_with_args(cpu_np, "qcom,freq-domain",
315 "#freq-domain-cells", 0,
316 &args);
317 of_node_put(cpu_np);
318 if (ret < 0)
319 continue;
320
321 if (index == args.args[0])
322 cpumask_set_cpu(cpu, m);
323 }
324}
325
326static void qcom_lmh_dcvs_notify(struct qcom_cpufreq_data *data)
327{
328 struct cpufreq_policy *policy = data->policy;
329 int cpu = cpumask_first(policy->related_cpus);
330 struct device *dev = get_cpu_device(cpu);
331 unsigned long freq_hz, throttled_freq;
332 struct dev_pm_opp *opp;
333
334 /*
335 * Get the h/w throttled frequency, normalize it using the
336 * registered opp table and use it to calculate thermal pressure.
337 */
338 freq_hz = qcom_lmh_get_throttle_freq(data);
339
340 opp = dev_pm_opp_find_freq_floor(dev, &freq_hz);
341 if (IS_ERR(opp) && PTR_ERR(opp) == -ERANGE)
342 opp = dev_pm_opp_find_freq_ceil(dev, &freq_hz);
343
344 if (IS_ERR(opp)) {
345 dev_warn(dev, "Can't find the OPP for throttling: %pe!\n", opp);
346 } else {
347 dev_pm_opp_put(opp);
348 }
349
350 throttled_freq = freq_hz / HZ_PER_KHZ;
351
352 freq_qos_update_request(&data->throttle_freq_req, throttled_freq);
353
354 /* Update thermal pressure (the boost frequencies are accepted) */
355 arch_update_thermal_pressure(policy->related_cpus, throttled_freq);
356
357 /*
358 * In the unlikely case policy is unregistered do not enable
359 * polling or h/w interrupt
360 */
361 mutex_lock(&data->throttle_lock);
362 if (data->cancel_throttle)
363 goto out;
364
365 /*
366 * If h/w throttled frequency is higher than what cpufreq has requested
367 * for, then stop polling and switch back to interrupt mechanism.
368 */
369 if (throttled_freq >= qcom_cpufreq_get_freq(cpu))
370 enable_irq(data->throttle_irq);
371 else
372 mod_delayed_work(system_highpri_wq, &data->throttle_work,
373 msecs_to_jiffies(10));
374
375out:
376 mutex_unlock(&data->throttle_lock);
377}
378
379static void qcom_lmh_dcvs_poll(struct work_struct *work)
380{
381 struct qcom_cpufreq_data *data;
382
383 data = container_of(work, struct qcom_cpufreq_data, throttle_work.work);
384 qcom_lmh_dcvs_notify(data);
385}
386
387static irqreturn_t qcom_lmh_dcvs_handle_irq(int irq, void *data)
388{
389 struct qcom_cpufreq_data *c_data = data;
390
391 /* Disable interrupt and enable polling */
392 disable_irq_nosync(c_data->throttle_irq);
393 schedule_delayed_work(&c_data->throttle_work, 0);
394
395 if (qcom_cpufreq.soc_data->reg_intr_clr)
396 writel_relaxed(GT_IRQ_STATUS,
397 c_data->base + qcom_cpufreq.soc_data->reg_intr_clr);
398
399 return IRQ_HANDLED;
400}
401
402static const struct qcom_cpufreq_soc_data qcom_soc_data = {
403 .reg_enable = 0x0,
404 .reg_dcvs_ctrl = 0xbc,
405 .reg_freq_lut = 0x110,
406 .reg_volt_lut = 0x114,
407 .reg_current_vote = 0x704,
408 .reg_perf_state = 0x920,
409 .lut_row_size = 32,
410};
411
412static const struct qcom_cpufreq_soc_data epss_soc_data = {
413 .reg_enable = 0x0,
414 .reg_domain_state = 0x20,
415 .reg_dcvs_ctrl = 0xb0,
416 .reg_freq_lut = 0x100,
417 .reg_volt_lut = 0x200,
418 .reg_intr_clr = 0x308,
419 .reg_perf_state = 0x320,
420 .lut_row_size = 4,
421};
422
423static const struct of_device_id qcom_cpufreq_hw_match[] = {
424 { .compatible = "qcom,cpufreq-hw", .data = &qcom_soc_data },
425 { .compatible = "qcom,cpufreq-epss", .data = &epss_soc_data },
426 {}
427};
428MODULE_DEVICE_TABLE(of, qcom_cpufreq_hw_match);
429
430static int qcom_cpufreq_hw_lmh_init(struct cpufreq_policy *policy, int index)
431{
432 struct qcom_cpufreq_data *data = policy->driver_data;
433 struct platform_device *pdev = cpufreq_get_driver_data();
434 int ret;
435
436 /*
437 * Look for LMh interrupt. If no interrupt line is specified /
438 * if there is an error, allow cpufreq to be enabled as usual.
439 */
440 data->throttle_irq = platform_get_irq_optional(pdev, index);
441 if (data->throttle_irq == -ENXIO)
442 return 0;
443 if (data->throttle_irq < 0)
444 return data->throttle_irq;
445
446 ret = freq_qos_add_request(&policy->constraints,
447 &data->throttle_freq_req, FREQ_QOS_MAX,
448 FREQ_QOS_MAX_DEFAULT_VALUE);
449 if (ret < 0) {
450 dev_err(&pdev->dev, "Failed to add freq constraint (%d)\n", ret);
451 return ret;
452 }
453
454 data->cancel_throttle = false;
455 data->policy = policy;
456
457 mutex_init(&data->throttle_lock);
458 INIT_DEFERRABLE_WORK(&data->throttle_work, qcom_lmh_dcvs_poll);
459
460 snprintf(data->irq_name, sizeof(data->irq_name), "dcvsh-irq-%u", policy->cpu);
461 ret = request_threaded_irq(data->throttle_irq, NULL, qcom_lmh_dcvs_handle_irq,
462 IRQF_ONESHOT | IRQF_NO_AUTOEN, data->irq_name, data);
463 if (ret) {
464 dev_err(&pdev->dev, "Error registering %s: %d\n", data->irq_name, ret);
465 return 0;
466 }
467
468 ret = irq_set_affinity_and_hint(data->throttle_irq, policy->cpus);
469 if (ret)
470 dev_err(&pdev->dev, "Failed to set CPU affinity of %s[%d]\n",
471 data->irq_name, data->throttle_irq);
472
473 return 0;
474}
475
476static int qcom_cpufreq_hw_cpu_online(struct cpufreq_policy *policy)
477{
478 struct qcom_cpufreq_data *data = policy->driver_data;
479 struct platform_device *pdev = cpufreq_get_driver_data();
480 int ret;
481
482 if (data->throttle_irq <= 0)
483 return 0;
484
485 mutex_lock(&data->throttle_lock);
486 data->cancel_throttle = false;
487 mutex_unlock(&data->throttle_lock);
488
489 ret = irq_set_affinity_and_hint(data->throttle_irq, policy->cpus);
490 if (ret)
491 dev_err(&pdev->dev, "Failed to set CPU affinity of %s[%d]\n",
492 data->irq_name, data->throttle_irq);
493
494 return ret;
495}
496
497static int qcom_cpufreq_hw_cpu_offline(struct cpufreq_policy *policy)
498{
499 struct qcom_cpufreq_data *data = policy->driver_data;
500
501 if (data->throttle_irq <= 0)
502 return 0;
503
504 mutex_lock(&data->throttle_lock);
505 data->cancel_throttle = true;
506 mutex_unlock(&data->throttle_lock);
507
508 cancel_delayed_work_sync(&data->throttle_work);
509 irq_set_affinity_and_hint(data->throttle_irq, NULL);
510 disable_irq_nosync(data->throttle_irq);
511
512 return 0;
513}
514
515static void qcom_cpufreq_hw_lmh_exit(struct qcom_cpufreq_data *data)
516{
517 if (data->throttle_irq <= 0)
518 return;
519
520 freq_qos_remove_request(&data->throttle_freq_req);
521 free_irq(data->throttle_irq, data);
522}
523
524static int qcom_cpufreq_hw_cpu_init(struct cpufreq_policy *policy)
525{
526 struct platform_device *pdev = cpufreq_get_driver_data();
527 struct device *dev = &pdev->dev;
528 struct of_phandle_args args;
529 struct device_node *cpu_np;
530 struct device *cpu_dev;
531 struct qcom_cpufreq_data *data;
532 int ret, index;
533
534 cpu_dev = get_cpu_device(policy->cpu);
535 if (!cpu_dev) {
536 pr_err("%s: failed to get cpu%d device\n", __func__,
537 policy->cpu);
538 return -ENODEV;
539 }
540
541 cpu_np = of_cpu_device_node_get(policy->cpu);
542 if (!cpu_np)
543 return -EINVAL;
544
545 ret = of_parse_phandle_with_args(cpu_np, "qcom,freq-domain",
546 "#freq-domain-cells", 0, &args);
547 of_node_put(cpu_np);
548 if (ret)
549 return ret;
550
551 index = args.args[0];
552 data = &qcom_cpufreq.data[index];
553
554 /* HW should be in enabled state to proceed */
555 if (!(readl_relaxed(data->base + qcom_cpufreq.soc_data->reg_enable) & 0x1)) {
556 dev_err(dev, "Domain-%d cpufreq hardware not enabled\n", index);
557 return -ENODEV;
558 }
559
560 if (readl_relaxed(data->base + qcom_cpufreq.soc_data->reg_dcvs_ctrl) & 0x1)
561 data->per_core_dcvs = true;
562
563 qcom_get_related_cpus(index, policy->cpus);
564
565 policy->driver_data = data;
566 policy->dvfs_possible_from_any_cpu = true;
567
568 ret = qcom_cpufreq_hw_read_lut(cpu_dev, policy);
569 if (ret) {
570 dev_err(dev, "Domain-%d failed to read LUT\n", index);
571 return ret;
572 }
573
574 ret = dev_pm_opp_get_opp_count(cpu_dev);
575 if (ret <= 0) {
576 dev_err(cpu_dev, "Failed to add OPPs\n");
577 return -ENODEV;
578 }
579
580 if (policy_has_boost_freq(policy)) {
581 ret = cpufreq_enable_boost_support();
582 if (ret)
583 dev_warn(cpu_dev, "failed to enable boost: %d\n", ret);
584 }
585
586 return qcom_cpufreq_hw_lmh_init(policy, index);
587}
588
589static int qcom_cpufreq_hw_cpu_exit(struct cpufreq_policy *policy)
590{
591 struct device *cpu_dev = get_cpu_device(policy->cpu);
592 struct qcom_cpufreq_data *data = policy->driver_data;
593 struct resource *res = data->res;
594 void __iomem *base = data->base;
595
596 dev_pm_opp_remove_all_dynamic(cpu_dev);
597 dev_pm_opp_of_cpumask_remove_table(policy->related_cpus);
598 qcom_cpufreq_hw_lmh_exit(data);
599 kfree(policy->freq_table);
600 kfree(data);
601 iounmap(base);
602 release_mem_region(res->start, resource_size(res));
603
604 return 0;
605}
606
607static void qcom_cpufreq_ready(struct cpufreq_policy *policy)
608{
609 struct qcom_cpufreq_data *data = policy->driver_data;
610
611 if (data->throttle_irq >= 0)
612 enable_irq(data->throttle_irq);
613}
614
615static struct freq_attr *qcom_cpufreq_hw_attr[] = {
616 &cpufreq_freq_attr_scaling_available_freqs,
617 &cpufreq_freq_attr_scaling_boost_freqs,
618 NULL
619};
620
621static struct cpufreq_driver cpufreq_qcom_hw_driver = {
622 .flags = CPUFREQ_NEED_INITIAL_FREQ_CHECK |
623 CPUFREQ_HAVE_GOVERNOR_PER_POLICY |
624 CPUFREQ_IS_COOLING_DEV,
625 .verify = cpufreq_generic_frequency_table_verify,
626 .target_index = qcom_cpufreq_hw_target_index,
627 .get = qcom_cpufreq_hw_get,
628 .init = qcom_cpufreq_hw_cpu_init,
629 .exit = qcom_cpufreq_hw_cpu_exit,
630 .online = qcom_cpufreq_hw_cpu_online,
631 .offline = qcom_cpufreq_hw_cpu_offline,
632 .register_em = cpufreq_register_em_with_opp,
633 .fast_switch = qcom_cpufreq_hw_fast_switch,
634 .name = "qcom-cpufreq-hw",
635 .attr = qcom_cpufreq_hw_attr,
636 .ready = qcom_cpufreq_ready,
637};
638
639static unsigned long qcom_cpufreq_hw_recalc_rate(struct clk_hw *hw, unsigned long parent_rate)
640{
641 struct qcom_cpufreq_data *data = container_of(hw, struct qcom_cpufreq_data, cpu_clk);
642
643 return qcom_lmh_get_throttle_freq(data);
644}
645
646static const struct clk_ops qcom_cpufreq_hw_clk_ops = {
647 .recalc_rate = qcom_cpufreq_hw_recalc_rate,
648};
649
650static int qcom_cpufreq_hw_driver_probe(struct platform_device *pdev)
651{
652 struct clk_hw_onecell_data *clk_data;
653 struct device *dev = &pdev->dev;
654 struct device_node *soc_node;
655 struct device *cpu_dev;
656 struct clk *clk;
657 int ret, i, num_domains, reg_sz;
658
659 clk = clk_get(dev, "xo");
660 if (IS_ERR(clk))
661 return PTR_ERR(clk);
662
663 xo_rate = clk_get_rate(clk);
664 clk_put(clk);
665
666 clk = clk_get(dev, "alternate");
667 if (IS_ERR(clk))
668 return PTR_ERR(clk);
669
670 cpu_hw_rate = clk_get_rate(clk) / CLK_HW_DIV;
671 clk_put(clk);
672
673 cpufreq_qcom_hw_driver.driver_data = pdev;
674
675 /* Check for optional interconnect paths on CPU0 */
676 cpu_dev = get_cpu_device(0);
677 if (!cpu_dev)
678 return -EPROBE_DEFER;
679
680 ret = dev_pm_opp_of_find_icc_paths(cpu_dev, NULL);
681 if (ret)
682 return ret;
683
684 /* Allocate qcom_cpufreq_data based on the available frequency domains in DT */
685 soc_node = of_get_parent(dev->of_node);
686 if (!soc_node)
687 return -EINVAL;
688
689 ret = of_property_read_u32(soc_node, "#address-cells", ®_sz);
690 if (ret)
691 goto of_exit;
692
693 ret = of_property_read_u32(soc_node, "#size-cells", &i);
694 if (ret)
695 goto of_exit;
696
697 reg_sz += i;
698
699 num_domains = of_property_count_elems_of_size(dev->of_node, "reg", sizeof(u32) * reg_sz);
700 if (num_domains <= 0)
701 return num_domains;
702
703 qcom_cpufreq.data = devm_kzalloc(dev, sizeof(struct qcom_cpufreq_data) * num_domains,
704 GFP_KERNEL);
705 if (!qcom_cpufreq.data)
706 return -ENOMEM;
707
708 qcom_cpufreq.soc_data = of_device_get_match_data(dev);
709 if (!qcom_cpufreq.soc_data)
710 return -ENODEV;
711
712 clk_data = devm_kzalloc(dev, struct_size(clk_data, hws, num_domains), GFP_KERNEL);
713 if (!clk_data)
714 return -ENOMEM;
715
716 clk_data->num = num_domains;
717
718 for (i = 0; i < num_domains; i++) {
719 struct qcom_cpufreq_data *data = &qcom_cpufreq.data[i];
720 struct clk_init_data clk_init = {};
721 struct resource *res;
722 void __iomem *base;
723
724 base = devm_platform_get_and_ioremap_resource(pdev, i, &res);
725 if (IS_ERR(base)) {
726 dev_err(dev, "Failed to map resource %pR\n", res);
727 return PTR_ERR(base);
728 }
729
730 data->base = base;
731 data->res = res;
732
733 /* Register CPU clock for each frequency domain */
734 clk_init.name = kasprintf(GFP_KERNEL, "qcom_cpufreq%d", i);
735 if (!clk_init.name)
736 return -ENOMEM;
737
738 clk_init.flags = CLK_GET_RATE_NOCACHE;
739 clk_init.ops = &qcom_cpufreq_hw_clk_ops;
740 data->cpu_clk.init = &clk_init;
741
742 ret = devm_clk_hw_register(dev, &data->cpu_clk);
743 if (ret < 0) {
744 dev_err(dev, "Failed to register clock %d: %d\n", i, ret);
745 kfree(clk_init.name);
746 return ret;
747 }
748
749 clk_data->hws[i] = &data->cpu_clk;
750 kfree(clk_init.name);
751 }
752
753 ret = devm_of_clk_add_hw_provider(dev, of_clk_hw_onecell_get, clk_data);
754 if (ret < 0) {
755 dev_err(dev, "Failed to add clock provider\n");
756 return ret;
757 }
758
759 ret = cpufreq_register_driver(&cpufreq_qcom_hw_driver);
760 if (ret)
761 dev_err(dev, "CPUFreq HW driver failed to register\n");
762 else
763 dev_dbg(dev, "QCOM CPUFreq HW driver initialized\n");
764
765of_exit:
766 of_node_put(soc_node);
767
768 return ret;
769}
770
771static int qcom_cpufreq_hw_driver_remove(struct platform_device *pdev)
772{
773 return cpufreq_unregister_driver(&cpufreq_qcom_hw_driver);
774}
775
776static struct platform_driver qcom_cpufreq_hw_driver = {
777 .probe = qcom_cpufreq_hw_driver_probe,
778 .remove = qcom_cpufreq_hw_driver_remove,
779 .driver = {
780 .name = "qcom-cpufreq-hw",
781 .of_match_table = qcom_cpufreq_hw_match,
782 },
783};
784
785static int __init qcom_cpufreq_hw_init(void)
786{
787 return platform_driver_register(&qcom_cpufreq_hw_driver);
788}
789postcore_initcall(qcom_cpufreq_hw_init);
790
791static void __exit qcom_cpufreq_hw_exit(void)
792{
793 platform_driver_unregister(&qcom_cpufreq_hw_driver);
794}
795module_exit(qcom_cpufreq_hw_exit);
796
797MODULE_DESCRIPTION("QCOM CPUFREQ HW Driver");
798MODULE_LICENSE("GPL v2");