Loading...
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/rockchip_grf.h>
26#include <soc/rockchip/rk3399_grf.h>
27#include <soc/rockchip/rockchip_sip.h>
28
29#define NS_TO_CYCLE(NS, MHz) (((NS) * (MHz)) / NSEC_PER_USEC)
30
31#define RK3399_SET_ODT_PD_0_SR_IDLE GENMASK(7, 0)
32#define RK3399_SET_ODT_PD_0_SR_MC_GATE_IDLE GENMASK(15, 8)
33#define RK3399_SET_ODT_PD_0_STANDBY_IDLE GENMASK(31, 16)
34
35#define RK3399_SET_ODT_PD_1_PD_IDLE GENMASK(11, 0)
36#define RK3399_SET_ODT_PD_1_SRPD_LITE_IDLE GENMASK(27, 16)
37
38#define RK3399_SET_ODT_PD_2_ODT_ENABLE BIT(0)
39
40struct rk3399_dmcfreq {
41 struct device *dev;
42 struct devfreq *devfreq;
43 struct devfreq_dev_profile profile;
44 struct devfreq_simple_ondemand_data ondemand_data;
45 struct clk *dmc_clk;
46 struct devfreq_event_dev *edev;
47 struct mutex lock;
48 struct regulator *vdd_center;
49 struct regmap *regmap_pmu;
50 unsigned long rate, target_rate;
51 unsigned long volt, target_volt;
52 unsigned int odt_dis_freq;
53
54 unsigned int pd_idle_ns;
55 unsigned int sr_idle_ns;
56 unsigned int sr_mc_gate_idle_ns;
57 unsigned int srpd_lite_idle_ns;
58 unsigned int standby_idle_ns;
59 unsigned int ddr3_odt_dis_freq;
60 unsigned int lpddr3_odt_dis_freq;
61 unsigned int lpddr4_odt_dis_freq;
62
63 unsigned int pd_idle_dis_freq;
64 unsigned int sr_idle_dis_freq;
65 unsigned int sr_mc_gate_idle_dis_freq;
66 unsigned int srpd_lite_idle_dis_freq;
67 unsigned int standby_idle_dis_freq;
68};
69
70static int rk3399_dmcfreq_target(struct device *dev, unsigned long *freq,
71 u32 flags)
72{
73 struct rk3399_dmcfreq *dmcfreq = dev_get_drvdata(dev);
74 struct dev_pm_opp *opp;
75 unsigned long old_clk_rate = dmcfreq->rate;
76 unsigned long target_volt, target_rate;
77 unsigned int ddrcon_mhz;
78 struct arm_smccc_res res;
79 int err;
80
81 u32 odt_pd_arg0 = 0;
82 u32 odt_pd_arg1 = 0;
83 u32 odt_pd_arg2 = 0;
84
85 opp = devfreq_recommended_opp(dev, freq, flags);
86 if (IS_ERR(opp))
87 return PTR_ERR(opp);
88
89 target_rate = dev_pm_opp_get_freq(opp);
90 target_volt = dev_pm_opp_get_voltage(opp);
91 dev_pm_opp_put(opp);
92
93 if (dmcfreq->rate == target_rate)
94 return 0;
95
96 mutex_lock(&dmcfreq->lock);
97
98 /*
99 * Ensure power-domain transitions don't interfere with ARM Trusted
100 * Firmware power-domain idling.
101 */
102 err = rockchip_pmu_block();
103 if (err) {
104 dev_err(dev, "Failed to block PMU: %d\n", err);
105 goto out_unlock;
106 }
107
108 /*
109 * Some idle parameters may be based on the DDR controller clock, which
110 * is half of the DDR frequency.
111 * pd_idle and standby_idle are based on the controller clock cycle.
112 * sr_idle_cycle, sr_mc_gate_idle_cycle, and srpd_lite_idle_cycle
113 * are based on the 1024 controller clock cycle
114 */
115 ddrcon_mhz = target_rate / USEC_PER_SEC / 2;
116
117 u32p_replace_bits(&odt_pd_arg1,
118 NS_TO_CYCLE(dmcfreq->pd_idle_ns, ddrcon_mhz),
119 RK3399_SET_ODT_PD_1_PD_IDLE);
120 u32p_replace_bits(&odt_pd_arg0,
121 NS_TO_CYCLE(dmcfreq->standby_idle_ns, ddrcon_mhz),
122 RK3399_SET_ODT_PD_0_STANDBY_IDLE);
123 u32p_replace_bits(&odt_pd_arg0,
124 DIV_ROUND_UP(NS_TO_CYCLE(dmcfreq->sr_idle_ns,
125 ddrcon_mhz), 1024),
126 RK3399_SET_ODT_PD_0_SR_IDLE);
127 u32p_replace_bits(&odt_pd_arg0,
128 DIV_ROUND_UP(NS_TO_CYCLE(dmcfreq->sr_mc_gate_idle_ns,
129 ddrcon_mhz), 1024),
130 RK3399_SET_ODT_PD_0_SR_MC_GATE_IDLE);
131 u32p_replace_bits(&odt_pd_arg1,
132 DIV_ROUND_UP(NS_TO_CYCLE(dmcfreq->srpd_lite_idle_ns,
133 ddrcon_mhz), 1024),
134 RK3399_SET_ODT_PD_1_SRPD_LITE_IDLE);
135
136 if (dmcfreq->regmap_pmu) {
137 if (target_rate >= dmcfreq->sr_idle_dis_freq)
138 odt_pd_arg0 &= ~RK3399_SET_ODT_PD_0_SR_IDLE;
139
140 if (target_rate >= dmcfreq->sr_mc_gate_idle_dis_freq)
141 odt_pd_arg0 &= ~RK3399_SET_ODT_PD_0_SR_MC_GATE_IDLE;
142
143 if (target_rate >= dmcfreq->standby_idle_dis_freq)
144 odt_pd_arg0 &= ~RK3399_SET_ODT_PD_0_STANDBY_IDLE;
145
146 if (target_rate >= dmcfreq->pd_idle_dis_freq)
147 odt_pd_arg1 &= ~RK3399_SET_ODT_PD_1_PD_IDLE;
148
149 if (target_rate >= dmcfreq->srpd_lite_idle_dis_freq)
150 odt_pd_arg1 &= ~RK3399_SET_ODT_PD_1_SRPD_LITE_IDLE;
151
152 if (target_rate >= dmcfreq->odt_dis_freq)
153 odt_pd_arg2 |= RK3399_SET_ODT_PD_2_ODT_ENABLE;
154
155 /*
156 * This makes a SMC call to the TF-A to set the DDR PD
157 * (power-down) timings and to enable or disable the
158 * ODT (on-die termination) resistors.
159 */
160 arm_smccc_smc(ROCKCHIP_SIP_DRAM_FREQ, odt_pd_arg0, odt_pd_arg1,
161 ROCKCHIP_SIP_CONFIG_DRAM_SET_ODT_PD, odt_pd_arg2,
162 0, 0, 0, &res);
163 }
164
165 /*
166 * If frequency scaling from low to high, adjust voltage first.
167 * If frequency scaling from high to low, adjust frequency first.
168 */
169 if (old_clk_rate < target_rate) {
170 err = regulator_set_voltage(dmcfreq->vdd_center, target_volt,
171 target_volt);
172 if (err) {
173 dev_err(dev, "Cannot set voltage %lu uV\n",
174 target_volt);
175 goto out;
176 }
177 }
178
179 err = clk_set_rate(dmcfreq->dmc_clk, target_rate);
180 if (err) {
181 dev_err(dev, "Cannot set frequency %lu (%d)\n", target_rate,
182 err);
183 regulator_set_voltage(dmcfreq->vdd_center, dmcfreq->volt,
184 dmcfreq->volt);
185 goto out;
186 }
187
188 /*
189 * Check the dpll rate,
190 * There only two result we will get,
191 * 1. Ddr frequency scaling fail, we still get the old rate.
192 * 2. Ddr frequency scaling sucessful, we get the rate we set.
193 */
194 dmcfreq->rate = clk_get_rate(dmcfreq->dmc_clk);
195
196 /* If get the incorrect rate, set voltage to old value. */
197 if (dmcfreq->rate != target_rate) {
198 dev_err(dev, "Got wrong frequency, Request %lu, Current %lu\n",
199 target_rate, dmcfreq->rate);
200 regulator_set_voltage(dmcfreq->vdd_center, dmcfreq->volt,
201 dmcfreq->volt);
202 goto out;
203 } else if (old_clk_rate > target_rate)
204 err = regulator_set_voltage(dmcfreq->vdd_center, target_volt,
205 target_volt);
206 if (err)
207 dev_err(dev, "Cannot set voltage %lu uV\n", target_volt);
208
209 dmcfreq->rate = target_rate;
210 dmcfreq->volt = target_volt;
211
212out:
213 rockchip_pmu_unblock();
214out_unlock:
215 mutex_unlock(&dmcfreq->lock);
216 return err;
217}
218
219static int rk3399_dmcfreq_get_dev_status(struct device *dev,
220 struct devfreq_dev_status *stat)
221{
222 struct rk3399_dmcfreq *dmcfreq = dev_get_drvdata(dev);
223 struct devfreq_event_data edata;
224 int ret = 0;
225
226 ret = devfreq_event_get_event(dmcfreq->edev, &edata);
227 if (ret < 0)
228 return ret;
229
230 stat->current_frequency = dmcfreq->rate;
231 stat->busy_time = edata.load_count;
232 stat->total_time = edata.total_count;
233
234 return ret;
235}
236
237static int rk3399_dmcfreq_get_cur_freq(struct device *dev, unsigned long *freq)
238{
239 struct rk3399_dmcfreq *dmcfreq = dev_get_drvdata(dev);
240
241 *freq = dmcfreq->rate;
242
243 return 0;
244}
245
246static __maybe_unused int rk3399_dmcfreq_suspend(struct device *dev)
247{
248 struct rk3399_dmcfreq *dmcfreq = dev_get_drvdata(dev);
249 int ret = 0;
250
251 ret = devfreq_event_disable_edev(dmcfreq->edev);
252 if (ret < 0) {
253 dev_err(dev, "failed to disable the devfreq-event devices\n");
254 return ret;
255 }
256
257 ret = devfreq_suspend_device(dmcfreq->devfreq);
258 if (ret < 0) {
259 dev_err(dev, "failed to suspend the devfreq devices\n");
260 return ret;
261 }
262
263 return 0;
264}
265
266static __maybe_unused int rk3399_dmcfreq_resume(struct device *dev)
267{
268 struct rk3399_dmcfreq *dmcfreq = dev_get_drvdata(dev);
269 int ret = 0;
270
271 ret = devfreq_event_enable_edev(dmcfreq->edev);
272 if (ret < 0) {
273 dev_err(dev, "failed to enable the devfreq-event devices\n");
274 return ret;
275 }
276
277 ret = devfreq_resume_device(dmcfreq->devfreq);
278 if (ret < 0) {
279 dev_err(dev, "failed to resume the devfreq devices\n");
280 return ret;
281 }
282 return ret;
283}
284
285static SIMPLE_DEV_PM_OPS(rk3399_dmcfreq_pm, rk3399_dmcfreq_suspend,
286 rk3399_dmcfreq_resume);
287
288static int rk3399_dmcfreq_of_props(struct rk3399_dmcfreq *data,
289 struct device_node *np)
290{
291 int ret = 0;
292
293 /*
294 * These are all optional, and serve as minimum bounds. Give them large
295 * (i.e., never "disabled") values if the DT doesn't specify one.
296 */
297 data->pd_idle_dis_freq =
298 data->sr_idle_dis_freq =
299 data->sr_mc_gate_idle_dis_freq =
300 data->srpd_lite_idle_dis_freq =
301 data->standby_idle_dis_freq = UINT_MAX;
302
303 ret |= of_property_read_u32(np, "rockchip,pd-idle-ns",
304 &data->pd_idle_ns);
305 ret |= of_property_read_u32(np, "rockchip,sr-idle-ns",
306 &data->sr_idle_ns);
307 ret |= of_property_read_u32(np, "rockchip,sr-mc-gate-idle-ns",
308 &data->sr_mc_gate_idle_ns);
309 ret |= of_property_read_u32(np, "rockchip,srpd-lite-idle-ns",
310 &data->srpd_lite_idle_ns);
311 ret |= of_property_read_u32(np, "rockchip,standby-idle-ns",
312 &data->standby_idle_ns);
313 ret |= of_property_read_u32(np, "rockchip,ddr3_odt_dis_freq",
314 &data->ddr3_odt_dis_freq);
315 ret |= of_property_read_u32(np, "rockchip,lpddr3_odt_dis_freq",
316 &data->lpddr3_odt_dis_freq);
317 ret |= of_property_read_u32(np, "rockchip,lpddr4_odt_dis_freq",
318 &data->lpddr4_odt_dis_freq);
319
320 ret |= of_property_read_u32(np, "rockchip,pd-idle-dis-freq-hz",
321 &data->pd_idle_dis_freq);
322 ret |= of_property_read_u32(np, "rockchip,sr-idle-dis-freq-hz",
323 &data->sr_idle_dis_freq);
324 ret |= of_property_read_u32(np, "rockchip,sr-mc-gate-idle-dis-freq-hz",
325 &data->sr_mc_gate_idle_dis_freq);
326 ret |= of_property_read_u32(np, "rockchip,srpd-lite-idle-dis-freq-hz",
327 &data->srpd_lite_idle_dis_freq);
328 ret |= of_property_read_u32(np, "rockchip,standby-idle-dis-freq-hz",
329 &data->standby_idle_dis_freq);
330
331 return ret;
332}
333
334static int rk3399_dmcfreq_probe(struct platform_device *pdev)
335{
336 struct arm_smccc_res res;
337 struct device *dev = &pdev->dev;
338 struct device_node *np = pdev->dev.of_node, *node;
339 struct rk3399_dmcfreq *data;
340 int ret;
341 struct dev_pm_opp *opp;
342 u32 ddr_type;
343 u32 val;
344
345 data = devm_kzalloc(dev, sizeof(struct rk3399_dmcfreq), GFP_KERNEL);
346 if (!data)
347 return -ENOMEM;
348
349 mutex_init(&data->lock);
350
351 data->vdd_center = devm_regulator_get(dev, "center");
352 if (IS_ERR(data->vdd_center))
353 return dev_err_probe(dev, PTR_ERR(data->vdd_center),
354 "Cannot get the regulator \"center\"\n");
355
356 data->dmc_clk = devm_clk_get(dev, "dmc_clk");
357 if (IS_ERR(data->dmc_clk))
358 return dev_err_probe(dev, PTR_ERR(data->dmc_clk),
359 "Cannot get the clk dmc_clk\n");
360
361 data->edev = devfreq_event_get_edev_by_phandle(dev, "devfreq-events", 0);
362 if (IS_ERR(data->edev))
363 return -EPROBE_DEFER;
364
365 ret = devfreq_event_enable_edev(data->edev);
366 if (ret < 0) {
367 dev_err(dev, "failed to enable devfreq-event devices\n");
368 return ret;
369 }
370
371 rk3399_dmcfreq_of_props(data, np);
372
373 node = of_parse_phandle(np, "rockchip,pmu", 0);
374 if (!node)
375 goto no_pmu;
376
377 data->regmap_pmu = syscon_node_to_regmap(node);
378 of_node_put(node);
379 if (IS_ERR(data->regmap_pmu)) {
380 ret = PTR_ERR(data->regmap_pmu);
381 goto err_edev;
382 }
383
384 regmap_read(data->regmap_pmu, RK3399_PMUGRF_OS_REG2, &val);
385 ddr_type = FIELD_GET(RK3399_PMUGRF_OS_REG2_DDRTYPE, val);
386
387 switch (ddr_type) {
388 case ROCKCHIP_DDRTYPE_DDR3:
389 data->odt_dis_freq = data->ddr3_odt_dis_freq;
390 break;
391 case ROCKCHIP_DDRTYPE_LPDDR3:
392 data->odt_dis_freq = data->lpddr3_odt_dis_freq;
393 break;
394 case ROCKCHIP_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 void 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
469static const struct of_device_id rk3399dmc_devfreq_of_match[] = {
470 { .compatible = "rockchip,rk3399-dmc" },
471 { },
472};
473MODULE_DEVICE_TABLE(of, rk3399dmc_devfreq_of_match);
474
475static struct platform_driver rk3399_dmcfreq_driver = {
476 .probe = rk3399_dmcfreq_probe,
477 .remove = rk3399_dmcfreq_remove,
478 .driver = {
479 .name = "rk3399-dmc-freq",
480 .pm = &rk3399_dmcfreq_pm,
481 .of_match_table = rk3399dmc_devfreq_of_match,
482 },
483};
484module_platform_driver(rk3399_dmcfreq_driver);
485
486MODULE_LICENSE("GPL v2");
487MODULE_AUTHOR("Lin Huang <hl@rock-chips.com>");
488MODULE_DESCRIPTION("RK3399 dmcfreq driver with devfreq framework");
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/clk.h>
9#include <linux/delay.h>
10#include <linux/devfreq.h>
11#include <linux/devfreq-event.h>
12#include <linux/interrupt.h>
13#include <linux/mfd/syscon.h>
14#include <linux/module.h>
15#include <linux/of.h>
16#include <linux/platform_device.h>
17#include <linux/pm_opp.h>
18#include <linux/regmap.h>
19#include <linux/regulator/consumer.h>
20#include <linux/rwsem.h>
21#include <linux/suspend.h>
22
23#include <soc/rockchip/rk3399_grf.h>
24#include <soc/rockchip/rockchip_sip.h>
25
26struct dram_timing {
27 unsigned int ddr3_speed_bin;
28 unsigned int pd_idle;
29 unsigned int sr_idle;
30 unsigned int sr_mc_gate_idle;
31 unsigned int srpd_lite_idle;
32 unsigned int standby_idle;
33 unsigned int auto_pd_dis_freq;
34 unsigned int dram_dll_dis_freq;
35 unsigned int phy_dll_dis_freq;
36 unsigned int ddr3_odt_dis_freq;
37 unsigned int ddr3_drv;
38 unsigned int ddr3_odt;
39 unsigned int phy_ddr3_ca_drv;
40 unsigned int phy_ddr3_dq_drv;
41 unsigned int phy_ddr3_odt;
42 unsigned int lpddr3_odt_dis_freq;
43 unsigned int lpddr3_drv;
44 unsigned int lpddr3_odt;
45 unsigned int phy_lpddr3_ca_drv;
46 unsigned int phy_lpddr3_dq_drv;
47 unsigned int phy_lpddr3_odt;
48 unsigned int lpddr4_odt_dis_freq;
49 unsigned int lpddr4_drv;
50 unsigned int lpddr4_dq_odt;
51 unsigned int lpddr4_ca_odt;
52 unsigned int phy_lpddr4_ca_drv;
53 unsigned int phy_lpddr4_ck_cs_drv;
54 unsigned int phy_lpddr4_dq_drv;
55 unsigned int phy_lpddr4_odt;
56};
57
58struct rk3399_dmcfreq {
59 struct device *dev;
60 struct devfreq *devfreq;
61 struct devfreq_simple_ondemand_data ondemand_data;
62 struct clk *dmc_clk;
63 struct devfreq_event_dev *edev;
64 struct mutex lock;
65 struct dram_timing timing;
66 struct regulator *vdd_center;
67 struct regmap *regmap_pmu;
68 unsigned long rate, target_rate;
69 unsigned long volt, target_volt;
70 unsigned int odt_dis_freq;
71 int odt_pd_arg0, odt_pd_arg1;
72};
73
74static int rk3399_dmcfreq_target(struct device *dev, unsigned long *freq,
75 u32 flags)
76{
77 struct rk3399_dmcfreq *dmcfreq = dev_get_drvdata(dev);
78 struct dev_pm_opp *opp;
79 unsigned long old_clk_rate = dmcfreq->rate;
80 unsigned long target_volt, target_rate;
81 struct arm_smccc_res res;
82 bool odt_enable = false;
83 int err;
84
85 opp = devfreq_recommended_opp(dev, freq, flags);
86 if (IS_ERR(opp))
87 return PTR_ERR(opp);
88
89 target_rate = dev_pm_opp_get_freq(opp);
90 target_volt = dev_pm_opp_get_voltage(opp);
91 dev_pm_opp_put(opp);
92
93 if (dmcfreq->rate == target_rate)
94 return 0;
95
96 mutex_lock(&dmcfreq->lock);
97
98 if (target_rate >= dmcfreq->odt_dis_freq)
99 odt_enable = true;
100
101 /*
102 * This makes a SMC call to the TF-A to set the DDR PD (power-down)
103 * timings and to enable or disable the ODT (on-die termination)
104 * resistors.
105 */
106 arm_smccc_smc(ROCKCHIP_SIP_DRAM_FREQ, dmcfreq->odt_pd_arg0,
107 dmcfreq->odt_pd_arg1,
108 ROCKCHIP_SIP_CONFIG_DRAM_SET_ODT_PD,
109 odt_enable, 0, 0, 0, &res);
110
111 /*
112 * If frequency scaling from low to high, adjust voltage first.
113 * If frequency scaling from high to low, adjust frequency first.
114 */
115 if (old_clk_rate < target_rate) {
116 err = regulator_set_voltage(dmcfreq->vdd_center, target_volt,
117 target_volt);
118 if (err) {
119 dev_err(dev, "Cannot set voltage %lu uV\n",
120 target_volt);
121 goto out;
122 }
123 }
124
125 err = clk_set_rate(dmcfreq->dmc_clk, target_rate);
126 if (err) {
127 dev_err(dev, "Cannot set frequency %lu (%d)\n", target_rate,
128 err);
129 regulator_set_voltage(dmcfreq->vdd_center, dmcfreq->volt,
130 dmcfreq->volt);
131 goto out;
132 }
133
134 /*
135 * Check the dpll rate,
136 * There only two result we will get,
137 * 1. Ddr frequency scaling fail, we still get the old rate.
138 * 2. Ddr frequency scaling sucessful, we get the rate we set.
139 */
140 dmcfreq->rate = clk_get_rate(dmcfreq->dmc_clk);
141
142 /* If get the incorrect rate, set voltage to old value. */
143 if (dmcfreq->rate != target_rate) {
144 dev_err(dev, "Got wrong frequency, Request %lu, Current %lu\n",
145 target_rate, dmcfreq->rate);
146 regulator_set_voltage(dmcfreq->vdd_center, dmcfreq->volt,
147 dmcfreq->volt);
148 goto out;
149 } else if (old_clk_rate > target_rate)
150 err = regulator_set_voltage(dmcfreq->vdd_center, target_volt,
151 target_volt);
152 if (err)
153 dev_err(dev, "Cannot set voltage %lu uV\n", target_volt);
154
155 dmcfreq->rate = target_rate;
156 dmcfreq->volt = target_volt;
157
158out:
159 mutex_unlock(&dmcfreq->lock);
160 return err;
161}
162
163static int rk3399_dmcfreq_get_dev_status(struct device *dev,
164 struct devfreq_dev_status *stat)
165{
166 struct rk3399_dmcfreq *dmcfreq = dev_get_drvdata(dev);
167 struct devfreq_event_data edata;
168 int ret = 0;
169
170 ret = devfreq_event_get_event(dmcfreq->edev, &edata);
171 if (ret < 0)
172 return ret;
173
174 stat->current_frequency = dmcfreq->rate;
175 stat->busy_time = edata.load_count;
176 stat->total_time = edata.total_count;
177
178 return ret;
179}
180
181static int rk3399_dmcfreq_get_cur_freq(struct device *dev, unsigned long *freq)
182{
183 struct rk3399_dmcfreq *dmcfreq = dev_get_drvdata(dev);
184
185 *freq = dmcfreq->rate;
186
187 return 0;
188}
189
190static struct devfreq_dev_profile rk3399_devfreq_dmc_profile = {
191 .polling_ms = 200,
192 .target = rk3399_dmcfreq_target,
193 .get_dev_status = rk3399_dmcfreq_get_dev_status,
194 .get_cur_freq = rk3399_dmcfreq_get_cur_freq,
195};
196
197static __maybe_unused int rk3399_dmcfreq_suspend(struct device *dev)
198{
199 struct rk3399_dmcfreq *dmcfreq = dev_get_drvdata(dev);
200 int ret = 0;
201
202 ret = devfreq_event_disable_edev(dmcfreq->edev);
203 if (ret < 0) {
204 dev_err(dev, "failed to disable the devfreq-event devices\n");
205 return ret;
206 }
207
208 ret = devfreq_suspend_device(dmcfreq->devfreq);
209 if (ret < 0) {
210 dev_err(dev, "failed to suspend the devfreq devices\n");
211 return ret;
212 }
213
214 return 0;
215}
216
217static __maybe_unused int rk3399_dmcfreq_resume(struct device *dev)
218{
219 struct rk3399_dmcfreq *dmcfreq = dev_get_drvdata(dev);
220 int ret = 0;
221
222 ret = devfreq_event_enable_edev(dmcfreq->edev);
223 if (ret < 0) {
224 dev_err(dev, "failed to enable the devfreq-event devices\n");
225 return ret;
226 }
227
228 ret = devfreq_resume_device(dmcfreq->devfreq);
229 if (ret < 0) {
230 dev_err(dev, "failed to resume the devfreq devices\n");
231 return ret;
232 }
233 return ret;
234}
235
236static SIMPLE_DEV_PM_OPS(rk3399_dmcfreq_pm, rk3399_dmcfreq_suspend,
237 rk3399_dmcfreq_resume);
238
239static int of_get_ddr_timings(struct dram_timing *timing,
240 struct device_node *np)
241{
242 int ret = 0;
243
244 ret = of_property_read_u32(np, "rockchip,ddr3_speed_bin",
245 &timing->ddr3_speed_bin);
246 ret |= of_property_read_u32(np, "rockchip,pd_idle",
247 &timing->pd_idle);
248 ret |= of_property_read_u32(np, "rockchip,sr_idle",
249 &timing->sr_idle);
250 ret |= of_property_read_u32(np, "rockchip,sr_mc_gate_idle",
251 &timing->sr_mc_gate_idle);
252 ret |= of_property_read_u32(np, "rockchip,srpd_lite_idle",
253 &timing->srpd_lite_idle);
254 ret |= of_property_read_u32(np, "rockchip,standby_idle",
255 &timing->standby_idle);
256 ret |= of_property_read_u32(np, "rockchip,auto_pd_dis_freq",
257 &timing->auto_pd_dis_freq);
258 ret |= of_property_read_u32(np, "rockchip,dram_dll_dis_freq",
259 &timing->dram_dll_dis_freq);
260 ret |= of_property_read_u32(np, "rockchip,phy_dll_dis_freq",
261 &timing->phy_dll_dis_freq);
262 ret |= of_property_read_u32(np, "rockchip,ddr3_odt_dis_freq",
263 &timing->ddr3_odt_dis_freq);
264 ret |= of_property_read_u32(np, "rockchip,ddr3_drv",
265 &timing->ddr3_drv);
266 ret |= of_property_read_u32(np, "rockchip,ddr3_odt",
267 &timing->ddr3_odt);
268 ret |= of_property_read_u32(np, "rockchip,phy_ddr3_ca_drv",
269 &timing->phy_ddr3_ca_drv);
270 ret |= of_property_read_u32(np, "rockchip,phy_ddr3_dq_drv",
271 &timing->phy_ddr3_dq_drv);
272 ret |= of_property_read_u32(np, "rockchip,phy_ddr3_odt",
273 &timing->phy_ddr3_odt);
274 ret |= of_property_read_u32(np, "rockchip,lpddr3_odt_dis_freq",
275 &timing->lpddr3_odt_dis_freq);
276 ret |= of_property_read_u32(np, "rockchip,lpddr3_drv",
277 &timing->lpddr3_drv);
278 ret |= of_property_read_u32(np, "rockchip,lpddr3_odt",
279 &timing->lpddr3_odt);
280 ret |= of_property_read_u32(np, "rockchip,phy_lpddr3_ca_drv",
281 &timing->phy_lpddr3_ca_drv);
282 ret |= of_property_read_u32(np, "rockchip,phy_lpddr3_dq_drv",
283 &timing->phy_lpddr3_dq_drv);
284 ret |= of_property_read_u32(np, "rockchip,phy_lpddr3_odt",
285 &timing->phy_lpddr3_odt);
286 ret |= of_property_read_u32(np, "rockchip,lpddr4_odt_dis_freq",
287 &timing->lpddr4_odt_dis_freq);
288 ret |= of_property_read_u32(np, "rockchip,lpddr4_drv",
289 &timing->lpddr4_drv);
290 ret |= of_property_read_u32(np, "rockchip,lpddr4_dq_odt",
291 &timing->lpddr4_dq_odt);
292 ret |= of_property_read_u32(np, "rockchip,lpddr4_ca_odt",
293 &timing->lpddr4_ca_odt);
294 ret |= of_property_read_u32(np, "rockchip,phy_lpddr4_ca_drv",
295 &timing->phy_lpddr4_ca_drv);
296 ret |= of_property_read_u32(np, "rockchip,phy_lpddr4_ck_cs_drv",
297 &timing->phy_lpddr4_ck_cs_drv);
298 ret |= of_property_read_u32(np, "rockchip,phy_lpddr4_dq_drv",
299 &timing->phy_lpddr4_dq_drv);
300 ret |= of_property_read_u32(np, "rockchip,phy_lpddr4_odt",
301 &timing->phy_lpddr4_odt);
302
303 return ret;
304}
305
306static int rk3399_dmcfreq_probe(struct platform_device *pdev)
307{
308 struct arm_smccc_res res;
309 struct device *dev = &pdev->dev;
310 struct device_node *np = pdev->dev.of_node, *node;
311 struct rk3399_dmcfreq *data;
312 int ret, index, size;
313 uint32_t *timing;
314 struct dev_pm_opp *opp;
315 u32 ddr_type;
316 u32 val;
317
318 data = devm_kzalloc(dev, sizeof(struct rk3399_dmcfreq), GFP_KERNEL);
319 if (!data)
320 return -ENOMEM;
321
322 mutex_init(&data->lock);
323
324 data->vdd_center = devm_regulator_get(dev, "center");
325 if (IS_ERR(data->vdd_center)) {
326 if (PTR_ERR(data->vdd_center) == -EPROBE_DEFER)
327 return -EPROBE_DEFER;
328
329 dev_err(dev, "Cannot get the regulator \"center\"\n");
330 return PTR_ERR(data->vdd_center);
331 }
332
333 data->dmc_clk = devm_clk_get(dev, "dmc_clk");
334 if (IS_ERR(data->dmc_clk)) {
335 if (PTR_ERR(data->dmc_clk) == -EPROBE_DEFER)
336 return -EPROBE_DEFER;
337
338 dev_err(dev, "Cannot get the clk dmc_clk\n");
339 return PTR_ERR(data->dmc_clk);
340 }
341
342 data->edev = devfreq_event_get_edev_by_phandle(dev, 0);
343 if (IS_ERR(data->edev))
344 return -EPROBE_DEFER;
345
346 ret = devfreq_event_enable_edev(data->edev);
347 if (ret < 0) {
348 dev_err(dev, "failed to enable devfreq-event devices\n");
349 return ret;
350 }
351
352 /*
353 * Get dram timing and pass it to arm trust firmware,
354 * the dram driver in arm trust firmware will get these
355 * timing and to do dram initial.
356 */
357 if (!of_get_ddr_timings(&data->timing, np)) {
358 timing = &data->timing.ddr3_speed_bin;
359 size = sizeof(struct dram_timing) / 4;
360 for (index = 0; index < size; index++) {
361 arm_smccc_smc(ROCKCHIP_SIP_DRAM_FREQ, *timing++, index,
362 ROCKCHIP_SIP_CONFIG_DRAM_SET_PARAM,
363 0, 0, 0, 0, &res);
364 if (res.a0) {
365 dev_err(dev, "Failed to set dram param: %ld\n",
366 res.a0);
367 return -EINVAL;
368 }
369 }
370 }
371
372 node = of_parse_phandle(np, "rockchip,pmu", 0);
373 if (node) {
374 data->regmap_pmu = syscon_node_to_regmap(node);
375 if (IS_ERR(data->regmap_pmu))
376 return PTR_ERR(data->regmap_pmu);
377 }
378
379 regmap_read(data->regmap_pmu, RK3399_PMUGRF_OS_REG2, &val);
380 ddr_type = (val >> RK3399_PMUGRF_DDRTYPE_SHIFT) &
381 RK3399_PMUGRF_DDRTYPE_MASK;
382
383 switch (ddr_type) {
384 case RK3399_PMUGRF_DDRTYPE_DDR3:
385 data->odt_dis_freq = data->timing.ddr3_odt_dis_freq;
386 break;
387 case RK3399_PMUGRF_DDRTYPE_LPDDR3:
388 data->odt_dis_freq = data->timing.lpddr3_odt_dis_freq;
389 break;
390 case RK3399_PMUGRF_DDRTYPE_LPDDR4:
391 data->odt_dis_freq = data->timing.lpddr4_odt_dis_freq;
392 break;
393 default:
394 return -EINVAL;
395 };
396
397 arm_smccc_smc(ROCKCHIP_SIP_DRAM_FREQ, 0, 0,
398 ROCKCHIP_SIP_CONFIG_DRAM_INIT,
399 0, 0, 0, 0, &res);
400
401 /*
402 * In TF-A there is a platform SIP call to set the PD (power-down)
403 * timings and to enable or disable the ODT (on-die termination).
404 * This call needs three arguments as follows:
405 *
406 * arg0:
407 * bit[0-7] : sr_idle
408 * bit[8-15] : sr_mc_gate_idle
409 * bit[16-31] : standby idle
410 * arg1:
411 * bit[0-11] : pd_idle
412 * bit[16-27] : srpd_lite_idle
413 * arg2:
414 * bit[0] : odt enable
415 */
416 data->odt_pd_arg0 = (data->timing.sr_idle & 0xff) |
417 ((data->timing.sr_mc_gate_idle & 0xff) << 8) |
418 ((data->timing.standby_idle & 0xffff) << 16);
419 data->odt_pd_arg1 = (data->timing.pd_idle & 0xfff) |
420 ((data->timing.srpd_lite_idle & 0xfff) << 16);
421
422 /*
423 * We add a devfreq driver to our parent since it has a device tree node
424 * with operating points.
425 */
426 if (dev_pm_opp_of_add_table(dev)) {
427 dev_err(dev, "Invalid operating-points in device tree.\n");
428 return -EINVAL;
429 }
430
431 of_property_read_u32(np, "upthreshold",
432 &data->ondemand_data.upthreshold);
433 of_property_read_u32(np, "downdifferential",
434 &data->ondemand_data.downdifferential);
435
436 data->rate = clk_get_rate(data->dmc_clk);
437
438 opp = devfreq_recommended_opp(dev, &data->rate, 0);
439 if (IS_ERR(opp)) {
440 ret = PTR_ERR(opp);
441 goto err_free_opp;
442 }
443
444 data->rate = dev_pm_opp_get_freq(opp);
445 data->volt = dev_pm_opp_get_voltage(opp);
446 dev_pm_opp_put(opp);
447
448 rk3399_devfreq_dmc_profile.initial_freq = data->rate;
449
450 data->devfreq = devm_devfreq_add_device(dev,
451 &rk3399_devfreq_dmc_profile,
452 DEVFREQ_GOV_SIMPLE_ONDEMAND,
453 &data->ondemand_data);
454 if (IS_ERR(data->devfreq)) {
455 ret = PTR_ERR(data->devfreq);
456 goto err_free_opp;
457 }
458
459 devm_devfreq_register_opp_notifier(dev, data->devfreq);
460
461 data->dev = dev;
462 platform_set_drvdata(pdev, data);
463
464 return 0;
465
466err_free_opp:
467 dev_pm_opp_of_remove_table(&pdev->dev);
468 return ret;
469}
470
471static int rk3399_dmcfreq_remove(struct platform_device *pdev)
472{
473 struct rk3399_dmcfreq *dmcfreq = dev_get_drvdata(&pdev->dev);
474
475 /*
476 * Before remove the opp table we need to unregister the opp notifier.
477 */
478 devm_devfreq_unregister_opp_notifier(dmcfreq->dev, dmcfreq->devfreq);
479 dev_pm_opp_of_remove_table(dmcfreq->dev);
480
481 return 0;
482}
483
484static const struct of_device_id rk3399dmc_devfreq_of_match[] = {
485 { .compatible = "rockchip,rk3399-dmc" },
486 { },
487};
488MODULE_DEVICE_TABLE(of, rk3399dmc_devfreq_of_match);
489
490static struct platform_driver rk3399_dmcfreq_driver = {
491 .probe = rk3399_dmcfreq_probe,
492 .remove = rk3399_dmcfreq_remove,
493 .driver = {
494 .name = "rk3399-dmc-freq",
495 .pm = &rk3399_dmcfreq_pm,
496 .of_match_table = rk3399dmc_devfreq_of_match,
497 },
498};
499module_platform_driver(rk3399_dmcfreq_driver);
500
501MODULE_LICENSE("GPL v2");
502MODULE_AUTHOR("Lin Huang <hl@rock-chips.com>");
503MODULE_DESCRIPTION("RK3399 dmcfreq driver with devfreq framework");