2 * Copyright (c) 2016, Fuzhou Rockchip Electronics Co., Ltd.
3 * Author: Lin Huang <hl@rock-chips.com>
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms and conditions of the GNU General Public License,
7 * version 2, as published by the Free Software Foundation.
9 * This program is distributed in the hope it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
15 #include <linux/arm-smccc.h>
16 #include <linux/clk.h>
17 #include <linux/delay.h>
18 #include <linux/devfreq.h>
19 #include <linux/devfreq-event.h>
20 #include <linux/interrupt.h>
21 #include <linux/module.h>
23 #include <linux/platform_device.h>
24 #include <linux/pm_opp.h>
25 #include <linux/regulator/consumer.h>
26 #include <linux/rwsem.h>
27 #include <linux/slab.h>
28 #include <linux/suspend.h>
30 #include <soc/rockchip/rockchip_sip.h>
33 unsigned int ddr3_speed_bin;
36 unsigned int sr_mc_gate_idle;
37 unsigned int srpd_lite_idle;
38 unsigned int standby_idle;
39 unsigned int dram_dll_dis_freq;
40 unsigned int phy_dll_dis_freq;
41 unsigned int ddr3_odt_dis_freq;
42 unsigned int ddr3_drv;
43 unsigned int ddr3_odt;
44 unsigned int phy_ddr3_ca_drv;
45 unsigned int phy_ddr3_dq_drv;
46 unsigned int phy_ddr3_odt;
47 unsigned int lpddr3_odt_dis_freq;
48 unsigned int lpddr3_drv;
49 unsigned int lpddr3_odt;
50 unsigned int phy_lpddr3_ca_drv;
51 unsigned int phy_lpddr3_dq_drv;
52 unsigned int phy_lpddr3_odt;
53 unsigned int lpddr4_odt_dis_freq;
54 unsigned int lpddr4_drv;
55 unsigned int lpddr4_dq_odt;
56 unsigned int lpddr4_ca_odt;
57 unsigned int phy_lpddr4_ca_drv;
58 unsigned int phy_lpddr4_ck_cs_drv;
59 unsigned int phy_lpddr4_dq_drv;
60 unsigned int phy_lpddr4_odt;
63 struct rk3399_dmcfreq {
65 struct devfreq *devfreq;
66 struct devfreq_simple_ondemand_data ondemand_data;
68 struct devfreq_event_dev *edev;
70 struct dram_timing *timing;
73 * DDR Converser of Frequency (DCF) is used to implement DDR frequency
74 * conversion without the participation of CPU, we will implement and
75 * control it in arm trust firmware.
77 wait_queue_head_t wait_dcf_queue;
80 struct regulator *vdd_center;
81 unsigned long rate, target_rate;
82 unsigned long volt, target_volt;
83 struct dev_pm_opp *curr_opp;
86 static int rk3399_dmcfreq_target(struct device *dev, unsigned long *freq,
89 struct rk3399_dmcfreq *dmcfreq = dev_get_drvdata(dev);
90 struct dev_pm_opp *opp;
91 unsigned long old_clk_rate = dmcfreq->rate;
92 unsigned long target_volt, target_rate;
96 opp = devfreq_recommended_opp(dev, freq, flags);
102 target_rate = dev_pm_opp_get_freq(opp);
103 target_volt = dev_pm_opp_get_voltage(opp);
105 dmcfreq->rate = dev_pm_opp_get_freq(dmcfreq->curr_opp);
106 dmcfreq->volt = dev_pm_opp_get_voltage(dmcfreq->curr_opp);
110 if (dmcfreq->rate == target_rate)
113 mutex_lock(&dmcfreq->lock);
116 * If frequency scaling from low to high, adjust voltage first.
117 * If frequency scaling from high to low, adjust frequency first.
119 if (old_clk_rate < target_rate) {
120 err = regulator_set_voltage(dmcfreq->vdd_center, target_volt,
123 dev_err(dev, "Cannot to set voltage %lu uV\n",
128 dmcfreq->wait_dcf_flag = 1;
130 err = clk_set_rate(dmcfreq->dmc_clk, target_rate);
132 dev_err(dev, "Cannot to set frequency %lu (%d)\n",
134 regulator_set_voltage(dmcfreq->vdd_center, dmcfreq->volt,
140 * Wait until bcf irq happen, it means freq scaling finish in
141 * arm trust firmware, use 100ms as timeout time.
143 if (!wait_event_timeout(dmcfreq->wait_dcf_queue,
144 !dmcfreq->wait_dcf_flag, HZ / 10))
145 dev_warn(dev, "Timeout waiting for dcf interrupt\n");
148 * Check the dpll rate,
149 * There only two result we will get,
150 * 1. Ddr frequency scaling fail, we still get the old rate.
151 * 2. Ddr frequency scaling sucessful, we get the rate we set.
153 dmcfreq->rate = clk_get_rate(dmcfreq->dmc_clk);
155 /* If get the incorrect rate, set voltage to old value. */
156 if (dmcfreq->rate != target_rate) {
157 dev_err(dev, "Get wrong ddr frequency, Request frequency %lu,\
158 Current frequency %lu\n", target_rate, dmcfreq->rate);
159 regulator_set_voltage(dmcfreq->vdd_center, dmcfreq->volt,
162 } else if (old_clk_rate > target_rate)
163 err = regulator_set_voltage(dmcfreq->vdd_center, target_volt,
166 dev_err(dev, "Cannot to set vol %lu uV\n", target_volt);
168 dmcfreq->curr_opp = opp;
170 mutex_unlock(&dmcfreq->lock);
174 static int rk3399_dmcfreq_get_dev_status(struct device *dev,
175 struct devfreq_dev_status *stat)
177 struct rk3399_dmcfreq *dmcfreq = dev_get_drvdata(dev);
178 struct devfreq_event_data edata;
181 ret = devfreq_event_get_event(dmcfreq->edev, &edata);
185 stat->current_frequency = dmcfreq->rate;
186 stat->busy_time = edata.load_count;
187 stat->total_time = edata.total_count;
192 static int rk3399_dmcfreq_get_cur_freq(struct device *dev, unsigned long *freq)
194 struct rk3399_dmcfreq *dmcfreq = dev_get_drvdata(dev);
196 *freq = dmcfreq->rate;
201 static struct devfreq_dev_profile rk3399_devfreq_dmc_profile = {
203 .target = rk3399_dmcfreq_target,
204 .get_dev_status = rk3399_dmcfreq_get_dev_status,
205 .get_cur_freq = rk3399_dmcfreq_get_cur_freq,
208 static __maybe_unused int rk3399_dmcfreq_suspend(struct device *dev)
210 struct rk3399_dmcfreq *dmcfreq = dev_get_drvdata(dev);
213 ret = devfreq_event_disable_edev(dmcfreq->edev);
215 dev_err(dev, "failed to disable the devfreq-event devices\n");
219 ret = devfreq_suspend_device(dmcfreq->devfreq);
221 dev_err(dev, "failed to suspend the devfreq devices\n");
228 static __maybe_unused int rk3399_dmcfreq_resume(struct device *dev)
230 struct rk3399_dmcfreq *dmcfreq = dev_get_drvdata(dev);
233 ret = devfreq_event_enable_edev(dmcfreq->edev);
235 dev_err(dev, "failed to enable the devfreq-event devices\n");
239 ret = devfreq_resume_device(dmcfreq->devfreq);
241 dev_err(dev, "failed to resume the devfreq devices\n");
247 static SIMPLE_DEV_PM_OPS(rk3399_dmcfreq_pm, rk3399_dmcfreq_suspend,
248 rk3399_dmcfreq_resume);
250 static irqreturn_t rk3399_dmc_irq(int irq, void *dev_id)
252 struct rk3399_dmcfreq *dmcfreq = dev_id;
253 struct arm_smccc_res res;
255 dmcfreq->wait_dcf_flag = 0;
256 wake_up(&dmcfreq->wait_dcf_queue);
258 /* Clear the DCF interrupt */
259 arm_smccc_smc(ROCKCHIP_SIP_DRAM_FREQ, 0, 0,
260 ROCKCHIP_SIP_CONFIG_DRAM_CLR_IRQ,
266 static struct dram_timing *of_get_ddr_timings(struct device *dev,
267 struct device_node *np)
269 struct dram_timing *timing = NULL;
270 struct device_node *np_tim;
273 np_tim = of_parse_phandle(np, "ddr_timing", 0);
275 timing = devm_kzalloc(dev, sizeof(*timing), GFP_KERNEL);
279 ret = of_property_read_u32(np_tim, "ddr3_speed_bin",
280 &timing->ddr3_speed_bin);
281 ret |= of_property_read_u32(np_tim, "pd_idle",
283 ret |= of_property_read_u32(np_tim, "sr_idle",
285 ret |= of_property_read_u32(np_tim, "sr_mc_gate_idle",
286 &timing->sr_mc_gate_idle);
287 ret |= of_property_read_u32(np_tim, "srpd_lite_idle",
288 &timing->srpd_lite_idle);
289 ret |= of_property_read_u32(np_tim, "standby_idle",
290 &timing->standby_idle);
291 ret |= of_property_read_u32(np_tim, "dram_dll_dis_freq",
292 &timing->dram_dll_dis_freq);
293 ret |= of_property_read_u32(np_tim, "phy_dll_dis_freq",
294 &timing->phy_dll_dis_freq);
295 ret |= of_property_read_u32(np_tim, "ddr3_odt_dis_freq",
296 &timing->ddr3_odt_dis_freq);
297 ret |= of_property_read_u32(np_tim, "ddr3_drv",
299 ret |= of_property_read_u32(np_tim, "ddr3_odt",
301 ret |= of_property_read_u32(np_tim, "phy_ddr3_ca_drv",
302 &timing->phy_ddr3_ca_drv);
303 ret |= of_property_read_u32(np_tim, "phy_ddr3_dq_drv",
304 &timing->phy_ddr3_dq_drv);
305 ret |= of_property_read_u32(np_tim, "phy_ddr3_odt",
306 &timing->phy_ddr3_odt);
307 ret |= of_property_read_u32(np_tim, "lpddr3_odt_dis_freq",
308 &timing->lpddr3_odt_dis_freq);
309 ret |= of_property_read_u32(np_tim, "lpddr3_drv",
310 &timing->lpddr3_drv);
311 ret |= of_property_read_u32(np_tim, "lpddr3_odt",
312 &timing->lpddr3_odt);
313 ret |= of_property_read_u32(np_tim, "phy_lpddr3_ca_drv",
314 &timing->phy_lpddr3_ca_drv);
315 ret |= of_property_read_u32(np_tim, "phy_lpddr3_dq_drv",
316 &timing->phy_lpddr3_dq_drv);
317 ret |= of_property_read_u32(np_tim, "phy_lpddr3_odt",
318 &timing->phy_lpddr3_odt);
319 ret |= of_property_read_u32(np_tim, "lpddr4_odt_dis_freq",
320 &timing->lpddr4_odt_dis_freq);
321 ret |= of_property_read_u32(np_tim, "lpddr4_drv",
322 &timing->lpddr4_drv);
323 ret |= of_property_read_u32(np_tim, "lpddr4_dq_odt",
324 &timing->lpddr4_dq_odt);
325 ret |= of_property_read_u32(np_tim, "lpddr4_ca_odt",
326 &timing->lpddr4_ca_odt);
327 ret |= of_property_read_u32(np_tim, "phy_lpddr4_ca_drv",
328 &timing->phy_lpddr4_ca_drv);
329 ret |= of_property_read_u32(np_tim, "phy_lpddr4_ck_cs_drv",
330 &timing->phy_lpddr4_ck_cs_drv);
331 ret |= of_property_read_u32(np_tim, "phy_lpddr4_dq_drv",
332 &timing->phy_lpddr4_dq_drv);
333 ret |= of_property_read_u32(np_tim, "phy_lpddr4_odt",
334 &timing->phy_lpddr4_odt);
336 devm_kfree(dev, timing);
345 devm_kfree(dev, timing);
352 static int of_get_opp_table(struct device *dev,
353 struct devfreq_dev_profile *devp)
357 unsigned long freq = 0;
358 struct dev_pm_opp *opp;
361 count = dev_pm_opp_get_opp_count(dev);
368 devp->freq_table = kmalloc_array(count, sizeof(devp->freq_table[0]),
370 if (!devp->freq_table)
374 for (i = 0; i < count; i++, freq++) {
375 opp = dev_pm_opp_find_freq_ceil(dev, &freq);
379 devp->freq_table[i] = freq;
384 dev_warn(dev, "Unable to enumerate all OPPs (%d!=%d)\n",
391 static int rk3399_dmcfreq_probe(struct platform_device *pdev)
393 struct arm_smccc_res res;
394 struct device *dev = &pdev->dev;
395 struct device_node *np = pdev->dev.of_node;
396 struct rk3399_dmcfreq *data;
397 int ret, irq, index, size;
399 struct dev_pm_opp *opp;
400 struct devfreq_dev_profile *devp = &rk3399_devfreq_dmc_profile;
402 irq = platform_get_irq(pdev, 0);
404 dev_err(&pdev->dev, "Cannot get the dmc interrupt resource\n");
407 data = devm_kzalloc(dev, sizeof(struct rk3399_dmcfreq), GFP_KERNEL);
411 mutex_init(&data->lock);
413 data->vdd_center = devm_regulator_get(dev, "center");
414 if (IS_ERR(data->vdd_center)) {
415 dev_err(dev, "Cannot get the regulator \"center\"\n");
416 return PTR_ERR(data->vdd_center);
419 data->dmc_clk = devm_clk_get(dev, "dmc_clk");
420 if (IS_ERR(data->dmc_clk)) {
421 dev_err(dev, "Cannot get the clk dmc_clk\n");
422 return PTR_ERR(data->dmc_clk);
426 ret = devm_request_irq(dev, irq, rk3399_dmc_irq, 0,
427 dev_name(dev), data);
429 dev_err(dev, "Failed to request dmc irq: %d\n", ret);
433 init_waitqueue_head(&data->wait_dcf_queue);
434 data->wait_dcf_flag = 0;
436 data->edev = devfreq_event_get_edev_by_phandle(dev, 0);
437 if (IS_ERR(data->edev))
438 return -EPROBE_DEFER;
440 ret = devfreq_event_enable_edev(data->edev);
442 dev_err(dev, "failed to enable devfreq-event devices\n");
447 * Get dram timing and pass it to arm trust firmware,
448 * the dram drvier in arm trust firmware will get these
449 * timing and to do dram initial.
451 data->timing = of_get_ddr_timings(dev, np);
453 timing = (uint32_t *)data->timing;
454 size = sizeof(struct dram_timing) / 4;
455 for (index = 0; index < size; index++) {
456 arm_smccc_smc(ROCKCHIP_SIP_DRAM_FREQ, *timing++, index,
457 ROCKCHIP_SIP_CONFIG_DRAM_SET_PARAM,
460 dev_err(dev, "Failed to set dram param: %ld\n",
467 arm_smccc_smc(ROCKCHIP_SIP_DRAM_FREQ, 0, 0,
468 ROCKCHIP_SIP_CONFIG_DRAM_INIT,
472 * We add a devfreq driver to our parent since it has a device tree node
473 * with operating points.
475 if (dev_pm_opp_of_add_table(dev)) {
476 dev_err(dev, "Invalid operating-points in device tree.\n");
481 if (of_get_opp_table(dev, devp))
484 of_property_read_u32(np, "upthreshold",
485 &data->ondemand_data.upthreshold);
486 of_property_read_u32(np, "downdifferential",
487 &data->ondemand_data.downdifferential);
489 data->rate = clk_get_rate(data->dmc_clk);
492 opp = devfreq_recommended_opp(dev, &data->rate, 0);
499 data->curr_opp = opp;
500 devp->initial_freq = data->rate;
501 data->devfreq = devfreq_add_device(dev, devp,
503 &data->ondemand_data);
504 if (IS_ERR(data->devfreq))
505 return PTR_ERR(data->devfreq);
506 devm_devfreq_register_opp_notifier(dev, data->devfreq);
509 platform_set_drvdata(pdev, data);
514 static int rk3399_dmcfreq_remove(struct platform_device *pdev)
516 struct rk3399_dmcfreq *dmcfreq = platform_get_drvdata(pdev);
518 regulator_put(dmcfreq->vdd_center);
523 static const struct of_device_id rk3399dmc_devfreq_of_match[] = {
524 { .compatible = "rockchip,rk3399-dmc" },
528 static struct platform_driver rk3399_dmcfreq_driver = {
529 .probe = rk3399_dmcfreq_probe,
530 .remove = rk3399_dmcfreq_remove,
532 .name = "rk3399-dmc-freq",
533 .pm = &rk3399_dmcfreq_pm,
534 .of_match_table = rk3399dmc_devfreq_of_match,
537 module_platform_driver(rk3399_dmcfreq_driver);
539 MODULE_LICENSE("GPL v2");
540 MODULE_AUTHOR("Lin Huang <hl@rock-chips.com>");
541 MODULE_DESCRIPTION("RK3399 dmcfreq driver with devfreq framework");