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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (c) 2016, Fuzhou Rockchip Electronics Co., Ltd.
4 * Author: Lin Huang <hl@rock-chips.com>
5 */
6
7#include <linux/arm-smccc.h>
8#include <linux/bitfield.h>
9#include <linux/clk.h>
10#include <linux/delay.h>
11#include <linux/devfreq.h>
12#include <linux/devfreq-event.h>
13#include <linux/interrupt.h>
14#include <linux/mfd/syscon.h>
15#include <linux/module.h>
16#include <linux/of.h>
17#include <linux/platform_device.h>
18#include <linux/pm_opp.h>
19#include <linux/regmap.h>
20#include <linux/regulator/consumer.h>
21#include <linux/rwsem.h>
22#include <linux/suspend.h>
23
24#include <soc/rockchip/pm_domains.h>
25#include <soc/rockchip/rk3399_grf.h>
26#include <soc/rockchip/rockchip_sip.h>
27
28#define NS_TO_CYCLE(NS, MHz) (((NS) * (MHz)) / NSEC_PER_USEC)
29
30#define RK3399_SET_ODT_PD_0_SR_IDLE GENMASK(7, 0)
31#define RK3399_SET_ODT_PD_0_SR_MC_GATE_IDLE GENMASK(15, 8)
32#define RK3399_SET_ODT_PD_0_STANDBY_IDLE GENMASK(31, 16)
33
34#define RK3399_SET_ODT_PD_1_PD_IDLE GENMASK(11, 0)
35#define RK3399_SET_ODT_PD_1_SRPD_LITE_IDLE GENMASK(27, 16)
36
37#define RK3399_SET_ODT_PD_2_ODT_ENABLE BIT(0)
38
39struct rk3399_dmcfreq {
40 struct device *dev;
41 struct devfreq *devfreq;
42 struct devfreq_dev_profile profile;
43 struct devfreq_simple_ondemand_data ondemand_data;
44 struct clk *dmc_clk;
45 struct devfreq_event_dev *edev;
46 struct mutex lock;
47 struct regulator *vdd_center;
48 struct regmap *regmap_pmu;
49 unsigned long rate, target_rate;
50 unsigned long volt, target_volt;
51 unsigned int odt_dis_freq;
52
53 unsigned int pd_idle_ns;
54 unsigned int sr_idle_ns;
55 unsigned int sr_mc_gate_idle_ns;
56 unsigned int srpd_lite_idle_ns;
57 unsigned int standby_idle_ns;
58 unsigned int ddr3_odt_dis_freq;
59 unsigned int lpddr3_odt_dis_freq;
60 unsigned int lpddr4_odt_dis_freq;
61
62 unsigned int pd_idle_dis_freq;
63 unsigned int sr_idle_dis_freq;
64 unsigned int sr_mc_gate_idle_dis_freq;
65 unsigned int srpd_lite_idle_dis_freq;
66 unsigned int standby_idle_dis_freq;
67};
68
69static int rk3399_dmcfreq_target(struct device *dev, unsigned long *freq,
70 u32 flags)
71{
72 struct rk3399_dmcfreq *dmcfreq = dev_get_drvdata(dev);
73 struct dev_pm_opp *opp;
74 unsigned long old_clk_rate = dmcfreq->rate;
75 unsigned long target_volt, target_rate;
76 unsigned int ddrcon_mhz;
77 struct arm_smccc_res res;
78 int err;
79
80 u32 odt_pd_arg0 = 0;
81 u32 odt_pd_arg1 = 0;
82 u32 odt_pd_arg2 = 0;
83
84 opp = devfreq_recommended_opp(dev, freq, flags);
85 if (IS_ERR(opp))
86 return PTR_ERR(opp);
87
88 target_rate = dev_pm_opp_get_freq(opp);
89 target_volt = dev_pm_opp_get_voltage(opp);
90 dev_pm_opp_put(opp);
91
92 if (dmcfreq->rate == target_rate)
93 return 0;
94
95 mutex_lock(&dmcfreq->lock);
96
97 /*
98 * Ensure power-domain transitions don't interfere with ARM Trusted
99 * Firmware power-domain idling.
100 */
101 err = rockchip_pmu_block();
102 if (err) {
103 dev_err(dev, "Failed to block PMU: %d\n", err);
104 goto out_unlock;
105 }
106
107 /*
108 * Some idle parameters may be based on the DDR controller clock, which
109 * is half of the DDR frequency.
110 * pd_idle and standby_idle are based on the controller clock cycle.
111 * sr_idle_cycle, sr_mc_gate_idle_cycle, and srpd_lite_idle_cycle
112 * are based on the 1024 controller clock cycle
113 */
114 ddrcon_mhz = target_rate / USEC_PER_SEC / 2;
115
116 u32p_replace_bits(&odt_pd_arg1,
117 NS_TO_CYCLE(dmcfreq->pd_idle_ns, ddrcon_mhz),
118 RK3399_SET_ODT_PD_1_PD_IDLE);
119 u32p_replace_bits(&odt_pd_arg0,
120 NS_TO_CYCLE(dmcfreq->standby_idle_ns, ddrcon_mhz),
121 RK3399_SET_ODT_PD_0_STANDBY_IDLE);
122 u32p_replace_bits(&odt_pd_arg0,
123 DIV_ROUND_UP(NS_TO_CYCLE(dmcfreq->sr_idle_ns,
124 ddrcon_mhz), 1024),
125 RK3399_SET_ODT_PD_0_SR_IDLE);
126 u32p_replace_bits(&odt_pd_arg0,
127 DIV_ROUND_UP(NS_TO_CYCLE(dmcfreq->sr_mc_gate_idle_ns,
128 ddrcon_mhz), 1024),
129 RK3399_SET_ODT_PD_0_SR_MC_GATE_IDLE);
130 u32p_replace_bits(&odt_pd_arg1,
131 DIV_ROUND_UP(NS_TO_CYCLE(dmcfreq->srpd_lite_idle_ns,
132 ddrcon_mhz), 1024),
133 RK3399_SET_ODT_PD_1_SRPD_LITE_IDLE);
134
135 if (dmcfreq->regmap_pmu) {
136 if (target_rate >= dmcfreq->sr_idle_dis_freq)
137 odt_pd_arg0 &= ~RK3399_SET_ODT_PD_0_SR_IDLE;
138
139 if (target_rate >= dmcfreq->sr_mc_gate_idle_dis_freq)
140 odt_pd_arg0 &= ~RK3399_SET_ODT_PD_0_SR_MC_GATE_IDLE;
141
142 if (target_rate >= dmcfreq->standby_idle_dis_freq)
143 odt_pd_arg0 &= ~RK3399_SET_ODT_PD_0_STANDBY_IDLE;
144
145 if (target_rate >= dmcfreq->pd_idle_dis_freq)
146 odt_pd_arg1 &= ~RK3399_SET_ODT_PD_1_PD_IDLE;
147
148 if (target_rate >= dmcfreq->srpd_lite_idle_dis_freq)
149 odt_pd_arg1 &= ~RK3399_SET_ODT_PD_1_SRPD_LITE_IDLE;
150
151 if (target_rate >= dmcfreq->odt_dis_freq)
152 odt_pd_arg2 |= RK3399_SET_ODT_PD_2_ODT_ENABLE;
153
154 /*
155 * This makes a SMC call to the TF-A to set the DDR PD
156 * (power-down) timings and to enable or disable the
157 * ODT (on-die termination) resistors.
158 */
159 arm_smccc_smc(ROCKCHIP_SIP_DRAM_FREQ, odt_pd_arg0, odt_pd_arg1,
160 ROCKCHIP_SIP_CONFIG_DRAM_SET_ODT_PD, odt_pd_arg2,
161 0, 0, 0, &res);
162 }
163
164 /*
165 * If frequency scaling from low to high, adjust voltage first.
166 * If frequency scaling from high to low, adjust frequency first.
167 */
168 if (old_clk_rate < target_rate) {
169 err = regulator_set_voltage(dmcfreq->vdd_center, target_volt,
170 target_volt);
171 if (err) {
172 dev_err(dev, "Cannot set voltage %lu uV\n",
173 target_volt);
174 goto out;
175 }
176 }
177
178 err = clk_set_rate(dmcfreq->dmc_clk, target_rate);
179 if (err) {
180 dev_err(dev, "Cannot set frequency %lu (%d)\n", target_rate,
181 err);
182 regulator_set_voltage(dmcfreq->vdd_center, dmcfreq->volt,
183 dmcfreq->volt);
184 goto out;
185 }
186
187 /*
188 * Check the dpll rate,
189 * There only two result we will get,
190 * 1. Ddr frequency scaling fail, we still get the old rate.
191 * 2. Ddr frequency scaling sucessful, we get the rate we set.
192 */
193 dmcfreq->rate = clk_get_rate(dmcfreq->dmc_clk);
194
195 /* If get the incorrect rate, set voltage to old value. */
196 if (dmcfreq->rate != target_rate) {
197 dev_err(dev, "Got wrong frequency, Request %lu, Current %lu\n",
198 target_rate, dmcfreq->rate);
199 regulator_set_voltage(dmcfreq->vdd_center, dmcfreq->volt,
200 dmcfreq->volt);
201 goto out;
202 } else if (old_clk_rate > target_rate)
203 err = regulator_set_voltage(dmcfreq->vdd_center, target_volt,
204 target_volt);
205 if (err)
206 dev_err(dev, "Cannot set voltage %lu uV\n", target_volt);
207
208 dmcfreq->rate = target_rate;
209 dmcfreq->volt = target_volt;
210
211out:
212 rockchip_pmu_unblock();
213out_unlock:
214 mutex_unlock(&dmcfreq->lock);
215 return err;
216}
217
218static int rk3399_dmcfreq_get_dev_status(struct device *dev,
219 struct devfreq_dev_status *stat)
220{
221 struct rk3399_dmcfreq *dmcfreq = dev_get_drvdata(dev);
222 struct devfreq_event_data edata;
223 int ret = 0;
224
225 ret = devfreq_event_get_event(dmcfreq->edev, &edata);
226 if (ret < 0)
227 return ret;
228
229 stat->current_frequency = dmcfreq->rate;
230 stat->busy_time = edata.load_count;
231 stat->total_time = edata.total_count;
232
233 return ret;
234}
235
236static int rk3399_dmcfreq_get_cur_freq(struct device *dev, unsigned long *freq)
237{
238 struct rk3399_dmcfreq *dmcfreq = dev_get_drvdata(dev);
239
240 *freq = dmcfreq->rate;
241
242 return 0;
243}
244
245static __maybe_unused int rk3399_dmcfreq_suspend(struct device *dev)
246{
247 struct rk3399_dmcfreq *dmcfreq = dev_get_drvdata(dev);
248 int ret = 0;
249
250 ret = devfreq_event_disable_edev(dmcfreq->edev);
251 if (ret < 0) {
252 dev_err(dev, "failed to disable the devfreq-event devices\n");
253 return ret;
254 }
255
256 ret = devfreq_suspend_device(dmcfreq->devfreq);
257 if (ret < 0) {
258 dev_err(dev, "failed to suspend the devfreq devices\n");
259 return ret;
260 }
261
262 return 0;
263}
264
265static __maybe_unused int rk3399_dmcfreq_resume(struct device *dev)
266{
267 struct rk3399_dmcfreq *dmcfreq = dev_get_drvdata(dev);
268 int ret = 0;
269
270 ret = devfreq_event_enable_edev(dmcfreq->edev);
271 if (ret < 0) {
272 dev_err(dev, "failed to enable the devfreq-event devices\n");
273 return ret;
274 }
275
276 ret = devfreq_resume_device(dmcfreq->devfreq);
277 if (ret < 0) {
278 dev_err(dev, "failed to resume the devfreq devices\n");
279 return ret;
280 }
281 return ret;
282}
283
284static SIMPLE_DEV_PM_OPS(rk3399_dmcfreq_pm, rk3399_dmcfreq_suspend,
285 rk3399_dmcfreq_resume);
286
287static int rk3399_dmcfreq_of_props(struct rk3399_dmcfreq *data,
288 struct device_node *np)
289{
290 int ret = 0;
291
292 /*
293 * These are all optional, and serve as minimum bounds. Give them large
294 * (i.e., never "disabled") values if the DT doesn't specify one.
295 */
296 data->pd_idle_dis_freq =
297 data->sr_idle_dis_freq =
298 data->sr_mc_gate_idle_dis_freq =
299 data->srpd_lite_idle_dis_freq =
300 data->standby_idle_dis_freq = UINT_MAX;
301
302 ret |= of_property_read_u32(np, "rockchip,pd-idle-ns",
303 &data->pd_idle_ns);
304 ret |= of_property_read_u32(np, "rockchip,sr-idle-ns",
305 &data->sr_idle_ns);
306 ret |= of_property_read_u32(np, "rockchip,sr-mc-gate-idle-ns",
307 &data->sr_mc_gate_idle_ns);
308 ret |= of_property_read_u32(np, "rockchip,srpd-lite-idle-ns",
309 &data->srpd_lite_idle_ns);
310 ret |= of_property_read_u32(np, "rockchip,standby-idle-ns",
311 &data->standby_idle_ns);
312 ret |= of_property_read_u32(np, "rockchip,ddr3_odt_dis_freq",
313 &data->ddr3_odt_dis_freq);
314 ret |= of_property_read_u32(np, "rockchip,lpddr3_odt_dis_freq",
315 &data->lpddr3_odt_dis_freq);
316 ret |= of_property_read_u32(np, "rockchip,lpddr4_odt_dis_freq",
317 &data->lpddr4_odt_dis_freq);
318
319 ret |= of_property_read_u32(np, "rockchip,pd-idle-dis-freq-hz",
320 &data->pd_idle_dis_freq);
321 ret |= of_property_read_u32(np, "rockchip,sr-idle-dis-freq-hz",
322 &data->sr_idle_dis_freq);
323 ret |= of_property_read_u32(np, "rockchip,sr-mc-gate-idle-dis-freq-hz",
324 &data->sr_mc_gate_idle_dis_freq);
325 ret |= of_property_read_u32(np, "rockchip,srpd-lite-idle-dis-freq-hz",
326 &data->srpd_lite_idle_dis_freq);
327 ret |= of_property_read_u32(np, "rockchip,standby-idle-dis-freq-hz",
328 &data->standby_idle_dis_freq);
329
330 return ret;
331}
332
333static int rk3399_dmcfreq_probe(struct platform_device *pdev)
334{
335 struct arm_smccc_res res;
336 struct device *dev = &pdev->dev;
337 struct device_node *np = pdev->dev.of_node, *node;
338 struct rk3399_dmcfreq *data;
339 int ret;
340 struct dev_pm_opp *opp;
341 u32 ddr_type;
342 u32 val;
343
344 data = devm_kzalloc(dev, sizeof(struct rk3399_dmcfreq), GFP_KERNEL);
345 if (!data)
346 return -ENOMEM;
347
348 mutex_init(&data->lock);
349
350 data->vdd_center = devm_regulator_get(dev, "center");
351 if (IS_ERR(data->vdd_center))
352 return dev_err_probe(dev, PTR_ERR(data->vdd_center),
353 "Cannot get the regulator \"center\"\n");
354
355 data->dmc_clk = devm_clk_get(dev, "dmc_clk");
356 if (IS_ERR(data->dmc_clk))
357 return dev_err_probe(dev, PTR_ERR(data->dmc_clk),
358 "Cannot get the clk dmc_clk\n");
359
360 data->edev = devfreq_event_get_edev_by_phandle(dev, "devfreq-events", 0);
361 if (IS_ERR(data->edev))
362 return -EPROBE_DEFER;
363
364 ret = devfreq_event_enable_edev(data->edev);
365 if (ret < 0) {
366 dev_err(dev, "failed to enable devfreq-event devices\n");
367 return ret;
368 }
369
370 rk3399_dmcfreq_of_props(data, np);
371
372 node = of_parse_phandle(np, "rockchip,pmu", 0);
373 if (!node)
374 goto no_pmu;
375
376 data->regmap_pmu = syscon_node_to_regmap(node);
377 of_node_put(node);
378 if (IS_ERR(data->regmap_pmu)) {
379 ret = PTR_ERR(data->regmap_pmu);
380 goto err_edev;
381 }
382
383 regmap_read(data->regmap_pmu, RK3399_PMUGRF_OS_REG2, &val);
384 ddr_type = (val >> RK3399_PMUGRF_DDRTYPE_SHIFT) &
385 RK3399_PMUGRF_DDRTYPE_MASK;
386
387 switch (ddr_type) {
388 case RK3399_PMUGRF_DDRTYPE_DDR3:
389 data->odt_dis_freq = data->ddr3_odt_dis_freq;
390 break;
391 case RK3399_PMUGRF_DDRTYPE_LPDDR3:
392 data->odt_dis_freq = data->lpddr3_odt_dis_freq;
393 break;
394 case RK3399_PMUGRF_DDRTYPE_LPDDR4:
395 data->odt_dis_freq = data->lpddr4_odt_dis_freq;
396 break;
397 default:
398 ret = -EINVAL;
399 goto err_edev;
400 }
401
402no_pmu:
403 arm_smccc_smc(ROCKCHIP_SIP_DRAM_FREQ, 0, 0,
404 ROCKCHIP_SIP_CONFIG_DRAM_INIT,
405 0, 0, 0, 0, &res);
406
407 /*
408 * We add a devfreq driver to our parent since it has a device tree node
409 * with operating points.
410 */
411 if (devm_pm_opp_of_add_table(dev)) {
412 dev_err(dev, "Invalid operating-points in device tree.\n");
413 ret = -EINVAL;
414 goto err_edev;
415 }
416
417 data->ondemand_data.upthreshold = 25;
418 data->ondemand_data.downdifferential = 15;
419
420 data->rate = clk_get_rate(data->dmc_clk);
421
422 opp = devfreq_recommended_opp(dev, &data->rate, 0);
423 if (IS_ERR(opp)) {
424 ret = PTR_ERR(opp);
425 goto err_edev;
426 }
427
428 data->rate = dev_pm_opp_get_freq(opp);
429 data->volt = dev_pm_opp_get_voltage(opp);
430 dev_pm_opp_put(opp);
431
432 data->profile = (struct devfreq_dev_profile) {
433 .polling_ms = 200,
434 .target = rk3399_dmcfreq_target,
435 .get_dev_status = rk3399_dmcfreq_get_dev_status,
436 .get_cur_freq = rk3399_dmcfreq_get_cur_freq,
437 .initial_freq = data->rate,
438 };
439
440 data->devfreq = devm_devfreq_add_device(dev,
441 &data->profile,
442 DEVFREQ_GOV_SIMPLE_ONDEMAND,
443 &data->ondemand_data);
444 if (IS_ERR(data->devfreq)) {
445 ret = PTR_ERR(data->devfreq);
446 goto err_edev;
447 }
448
449 devm_devfreq_register_opp_notifier(dev, data->devfreq);
450
451 data->dev = dev;
452 platform_set_drvdata(pdev, data);
453
454 return 0;
455
456err_edev:
457 devfreq_event_disable_edev(data->edev);
458
459 return ret;
460}
461
462static int rk3399_dmcfreq_remove(struct platform_device *pdev)
463{
464 struct rk3399_dmcfreq *dmcfreq = dev_get_drvdata(&pdev->dev);
465
466 devfreq_event_disable_edev(dmcfreq->edev);
467
468 return 0;
469}
470
471static const struct of_device_id rk3399dmc_devfreq_of_match[] = {
472 { .compatible = "rockchip,rk3399-dmc" },
473 { },
474};
475MODULE_DEVICE_TABLE(of, rk3399dmc_devfreq_of_match);
476
477static struct platform_driver rk3399_dmcfreq_driver = {
478 .probe = rk3399_dmcfreq_probe,
479 .remove = rk3399_dmcfreq_remove,
480 .driver = {
481 .name = "rk3399-dmc-freq",
482 .pm = &rk3399_dmcfreq_pm,
483 .of_match_table = rk3399dmc_devfreq_of_match,
484 },
485};
486module_platform_driver(rk3399_dmcfreq_driver);
487
488MODULE_LICENSE("GPL v2");
489MODULE_AUTHOR("Lin Huang <hl@rock-chips.com>");
490MODULE_DESCRIPTION("RK3399 dmcfreq driver with devfreq framework");