drivers/devfreq/rk3399_dmc.c

   1 /*
   2  * Copyright (c) 2016, Fuzhou Rockchip Electronics Co., Ltd.
   3  * Author: Lin Huang <hl@rock-chips.com>
   4  *
   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.
   8  *
   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
  12  * more details.
  13  */
  14
  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>
  22 #include <linux/of.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/suspend.h>
  28
  29 #include <soc/rockchip/rockchip_sip.h>
  30
  31 struct dram_timing {
  32         unsigned int ddr3_speed_bin;
  33         unsigned int pd_idle;
  34         unsigned int sr_idle;
  35         unsigned int sr_mc_gate_idle;
  36         unsigned int srpd_lite_idle;
  37         unsigned int standby_idle;
  38         unsigned int auto_pd_dis_freq;
  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;
  61 };
  62
  63 struct rk3399_dmcfreq {
  64         struct device *dev;
  65         struct devfreq *devfreq;
  66         struct devfreq_simple_ondemand_data ondemand_data;
  67         struct clk *dmc_clk;
  68         struct devfreq_event_dev *edev;
  69         struct mutex lock;
  70         struct dram_timing timing;
  71
  72         /*
  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.
  76          */
  77         wait_queue_head_t       wait_dcf_queue;
  78         int irq;
  79         int wait_dcf_flag;
  80         struct regulator *vdd_center;
  81         unsigned long rate, target_rate;
  82         unsigned long volt, target_volt;
  83 };
  84
  85 static int rk3399_dmcfreq_target(struct device *dev, unsigned long *freq,
  86                                  u32 flags)
  87 {
  88         struct rk3399_dmcfreq *dmcfreq = dev_get_drvdata(dev);
  89         struct dev_pm_opp *opp;
  90         unsigned long old_clk_rate = dmcfreq->rate;
  91         unsigned long target_volt, target_rate;
  92         int err;
  93
  94         opp = devfreq_recommended_opp(dev, freq, flags);
  95         if (IS_ERR(opp))
  96                 return PTR_ERR(opp);
  97
  98         target_rate = dev_pm_opp_get_freq(opp);
  99         target_volt = dev_pm_opp_get_voltage(opp);
 100         dev_pm_opp_put(opp);
 101
 102         if (dmcfreq->rate == target_rate)
 103                 return 0;
 104
 105         mutex_lock(&dmcfreq->lock);
 106
 107         /*
 108          * If frequency scaling from low to high, adjust voltage first.
 109          * If frequency scaling from high to low, adjust frequency first.
 110          */
 111         if (old_clk_rate < target_rate) {
 112                 err = regulator_set_voltage(dmcfreq->vdd_center, target_volt,
 113                                             target_volt);
 114                 if (err) {
 115                         dev_err(dev, "Cannot to set voltage %lu uV\n",
 116                                 target_volt);
 117                         goto out;
 118                 }
 119         }
 120         dmcfreq->wait_dcf_flag = 1;
 121
 122         err = clk_set_rate(dmcfreq->dmc_clk, target_rate);
 123         if (err) {
 124                 dev_err(dev, "Cannot to set frequency %lu (%d)\n",
 125                         target_rate, err);
 126                 regulator_set_voltage(dmcfreq->vdd_center, dmcfreq->volt,
 127                                       dmcfreq->volt);
 128                 goto out;
 129         }
 130
 131         /*
 132          * Wait until bcf irq happen, it means freq scaling finish in
 133          * arm trust firmware, use 100ms as timeout time.
 134          */
 135         if (!wait_event_timeout(dmcfreq->wait_dcf_queue,
 136                                 !dmcfreq->wait_dcf_flag, HZ / 10))
 137                 dev_warn(dev, "Timeout waiting for dcf interrupt\n");
 138
 139         /*
 140          * Check the dpll rate,
 141          * There only two result we will get,
 142          * 1. Ddr frequency scaling fail, we still get the old rate.
 143          * 2. Ddr frequency scaling sucessful, we get the rate we set.
 144          */
 145         dmcfreq->rate = clk_get_rate(dmcfreq->dmc_clk);
 146
 147         /* If get the incorrect rate, set voltage to old value. */
 148         if (dmcfreq->rate != target_rate) {
 149                 dev_err(dev, "Get wrong ddr frequency, Request frequency %lu,\
 150                         Current frequency %lu\n", target_rate, dmcfreq->rate);
 151                 regulator_set_voltage(dmcfreq->vdd_center, dmcfreq->volt,
 152                                       dmcfreq->volt);
 153                 goto out;
 154         } else if (old_clk_rate > target_rate)
 155                 err = regulator_set_voltage(dmcfreq->vdd_center, target_volt,
 156                                             target_volt);
 157         if (err)
 158                 dev_err(dev, "Cannot to set vol %lu uV\n", target_volt);
 159
 160         dmcfreq->rate = target_rate;
 161         dmcfreq->volt = target_volt;
 162
 163 out:
 164         mutex_unlock(&dmcfreq->lock);
 165         return err;
 166 }
 167
 168 static int rk3399_dmcfreq_get_dev_status(struct device *dev,
 169                                          struct devfreq_dev_status *stat)
 170 {
 171         struct rk3399_dmcfreq *dmcfreq = dev_get_drvdata(dev);
 172         struct devfreq_event_data edata;
 173         int ret = 0;
 174
 175         ret = devfreq_event_get_event(dmcfreq->edev, &edata);
 176         if (ret < 0)
 177                 return ret;
 178
 179         stat->current_frequency = dmcfreq->rate;
 180         stat->busy_time = edata.load_count;
 181         stat->total_time = edata.total_count;
 182
 183         return ret;
 184 }
 185
 186 static int rk3399_dmcfreq_get_cur_freq(struct device *dev, unsigned long *freq)
 187 {
 188         struct rk3399_dmcfreq *dmcfreq = dev_get_drvdata(dev);
 189
 190         *freq = dmcfreq->rate;
 191
 192         return 0;
 193 }
 194
 195 static struct devfreq_dev_profile rk3399_devfreq_dmc_profile = {
 196         .polling_ms     = 200,
 197         .target         = rk3399_dmcfreq_target,
 198         .get_dev_status = rk3399_dmcfreq_get_dev_status,
 199         .get_cur_freq   = rk3399_dmcfreq_get_cur_freq,
 200 };
 201
 202 static __maybe_unused int rk3399_dmcfreq_suspend(struct device *dev)
 203 {
 204         struct rk3399_dmcfreq *dmcfreq = dev_get_drvdata(dev);
 205         int ret = 0;
 206
 207         ret = devfreq_event_disable_edev(dmcfreq->edev);
 208         if (ret < 0) {
 209                 dev_err(dev, "failed to disable the devfreq-event devices\n");
 210                 return ret;
 211         }
 212
 213         ret = devfreq_suspend_device(dmcfreq->devfreq);
 214         if (ret < 0) {
 215                 dev_err(dev, "failed to suspend the devfreq devices\n");
 216                 return ret;
 217         }
 218
 219         return 0;
 220 }
 221
 222 static __maybe_unused int rk3399_dmcfreq_resume(struct device *dev)
 223 {
 224         struct rk3399_dmcfreq *dmcfreq = dev_get_drvdata(dev);
 225         int ret = 0;
 226
 227         ret = devfreq_event_enable_edev(dmcfreq->edev);
 228         if (ret < 0) {
 229                 dev_err(dev, "failed to enable the devfreq-event devices\n");
 230                 return ret;
 231         }
 232
 233         ret = devfreq_resume_device(dmcfreq->devfreq);
 234         if (ret < 0) {
 235                 dev_err(dev, "failed to resume the devfreq devices\n");
 236                 return ret;
 237         }
 238         return ret;
 239 }
 240
 241 static SIMPLE_DEV_PM_OPS(rk3399_dmcfreq_pm, rk3399_dmcfreq_suspend,
 242                          rk3399_dmcfreq_resume);
 243
 244 static irqreturn_t rk3399_dmc_irq(int irq, void *dev_id)
 245 {
 246         struct rk3399_dmcfreq *dmcfreq = dev_id;
 247         struct arm_smccc_res res;
 248
 249         dmcfreq->wait_dcf_flag = 0;
 250         wake_up(&dmcfreq->wait_dcf_queue);
 251
 252         /* Clear the DCF interrupt */
 253         arm_smccc_smc(ROCKCHIP_SIP_DRAM_FREQ, 0, 0,
 254                       ROCKCHIP_SIP_CONFIG_DRAM_CLR_IRQ,
 255                       0, 0, 0, 0, &res);
 256
 257         return IRQ_HANDLED;
 258 }
 259
 260 static int of_get_ddr_timings(struct dram_timing *timing,
 261                               struct device_node *np)
 262 {
 263         int ret = 0;
 264
 265         ret = of_property_read_u32(np, "rockchip,ddr3_speed_bin",
 266                                    &timing->ddr3_speed_bin);
 267         ret |= of_property_read_u32(np, "rockchip,pd_idle",
 268                                     &timing->pd_idle);
 269         ret |= of_property_read_u32(np, "rockchip,sr_idle",
 270                                     &timing->sr_idle);
 271         ret |= of_property_read_u32(np, "rockchip,sr_mc_gate_idle",
 272                                     &timing->sr_mc_gate_idle);
 273         ret |= of_property_read_u32(np, "rockchip,srpd_lite_idle",
 274                                     &timing->srpd_lite_idle);
 275         ret |= of_property_read_u32(np, "rockchip,standby_idle",
 276                                     &timing->standby_idle);
 277         ret |= of_property_read_u32(np, "rockchip,auto_pd_dis_freq",
 278                                     &timing->auto_pd_dis_freq);
 279         ret |= of_property_read_u32(np, "rockchip,dram_dll_dis_freq",
 280                                     &timing->dram_dll_dis_freq);
 281         ret |= of_property_read_u32(np, "rockchip,phy_dll_dis_freq",
 282                                     &timing->phy_dll_dis_freq);
 283         ret |= of_property_read_u32(np, "rockchip,ddr3_odt_dis_freq",
 284                                     &timing->ddr3_odt_dis_freq);
 285         ret |= of_property_read_u32(np, "rockchip,ddr3_drv",
 286                                     &timing->ddr3_drv);
 287         ret |= of_property_read_u32(np, "rockchip,ddr3_odt",
 288                                     &timing->ddr3_odt);
 289         ret |= of_property_read_u32(np, "rockchip,phy_ddr3_ca_drv",
 290                                     &timing->phy_ddr3_ca_drv);
 291         ret |= of_property_read_u32(np, "rockchip,phy_ddr3_dq_drv",
 292                                     &timing->phy_ddr3_dq_drv);
 293         ret |= of_property_read_u32(np, "rockchip,phy_ddr3_odt",
 294                                     &timing->phy_ddr3_odt);
 295         ret |= of_property_read_u32(np, "rockchip,lpddr3_odt_dis_freq",
 296                                     &timing->lpddr3_odt_dis_freq);
 297         ret |= of_property_read_u32(np, "rockchip,lpddr3_drv",
 298                                     &timing->lpddr3_drv);
 299         ret |= of_property_read_u32(np, "rockchip,lpddr3_odt",
 300                                     &timing->lpddr3_odt);
 301         ret |= of_property_read_u32(np, "rockchip,phy_lpddr3_ca_drv",
 302                                     &timing->phy_lpddr3_ca_drv);
 303         ret |= of_property_read_u32(np, "rockchip,phy_lpddr3_dq_drv",
 304                                     &timing->phy_lpddr3_dq_drv);
 305         ret |= of_property_read_u32(np, "rockchip,phy_lpddr3_odt",
 306                                     &timing->phy_lpddr3_odt);
 307         ret |= of_property_read_u32(np, "rockchip,lpddr4_odt_dis_freq",
 308                                     &timing->lpddr4_odt_dis_freq);
 309         ret |= of_property_read_u32(np, "rockchip,lpddr4_drv",
 310                                     &timing->lpddr4_drv);
 311         ret |= of_property_read_u32(np, "rockchip,lpddr4_dq_odt",
 312                                     &timing->lpddr4_dq_odt);
 313         ret |= of_property_read_u32(np, "rockchip,lpddr4_ca_odt",
 314                                     &timing->lpddr4_ca_odt);
 315         ret |= of_property_read_u32(np, "rockchip,phy_lpddr4_ca_drv",
 316                                     &timing->phy_lpddr4_ca_drv);
 317         ret |= of_property_read_u32(np, "rockchip,phy_lpddr4_ck_cs_drv",
 318                                     &timing->phy_lpddr4_ck_cs_drv);
 319         ret |= of_property_read_u32(np, "rockchip,phy_lpddr4_dq_drv",
 320                                     &timing->phy_lpddr4_dq_drv);
 321         ret |= of_property_read_u32(np, "rockchip,phy_lpddr4_odt",
 322                                     &timing->phy_lpddr4_odt);
 323
 324         return ret;
 325 }
 326
 327 static int rk3399_dmcfreq_probe(struct platform_device *pdev)
 328 {
 329         struct arm_smccc_res res;
 330         struct device *dev = &pdev->dev;
 331         struct device_node *np = pdev->dev.of_node;
 332         struct rk3399_dmcfreq *data;
 333         int ret, irq, index, size;
 334         uint32_t *timing;
 335         struct dev_pm_opp *opp;
 336
 337         irq = platform_get_irq(pdev, 0);
 338         if (irq < 0) {
 339                 dev_err(&pdev->dev,
 340                         "Cannot get the dmc interrupt resource: %d\n", irq);
 341                 return irq;
 342         }
 343         data = devm_kzalloc(dev, sizeof(struct rk3399_dmcfreq), GFP_KERNEL);
 344         if (!data)
 345                 return -ENOMEM;
 346
 347         mutex_init(&data->lock);
 348
 349         data->vdd_center = devm_regulator_get(dev, "center");
 350         if (IS_ERR(data->vdd_center)) {
 351                 dev_err(dev, "Cannot get the regulator \"center\"\n");
 352                 return PTR_ERR(data->vdd_center);
 353         }
 354
 355         data->dmc_clk = devm_clk_get(dev, "dmc_clk");
 356         if (IS_ERR(data->dmc_clk)) {
 357                 dev_err(dev, "Cannot get the clk dmc_clk\n");
 358                 return PTR_ERR(data->dmc_clk);
 359         };
 360
 361         data->irq = irq;
 362         ret = devm_request_irq(dev, irq, rk3399_dmc_irq, 0,
 363                                dev_name(dev), data);
 364         if (ret) {
 365                 dev_err(dev, "Failed to request dmc irq: %d\n", ret);
 366                 return ret;
 367         }
 368
 369         init_waitqueue_head(&data->wait_dcf_queue);
 370         data->wait_dcf_flag = 0;
 371
 372         data->edev = devfreq_event_get_edev_by_phandle(dev, 0);
 373         if (IS_ERR(data->edev))
 374                 return -EPROBE_DEFER;
 375
 376         ret = devfreq_event_enable_edev(data->edev);
 377         if (ret < 0) {
 378                 dev_err(dev, "failed to enable devfreq-event devices\n");
 379                 return ret;
 380         }
 381
 382         /*
 383          * Get dram timing and pass it to arm trust firmware,
 384          * the dram drvier in arm trust firmware will get these
 385          * timing and to do dram initial.
 386          */
 387         if (!of_get_ddr_timings(&data->timing, np)) {
 388                 timing = &data->timing.ddr3_speed_bin;
 389                 size = sizeof(struct dram_timing) / 4;
 390                 for (index = 0; index < size; index++) {
 391                         arm_smccc_smc(ROCKCHIP_SIP_DRAM_FREQ, *timing++, index,
 392                                       ROCKCHIP_SIP_CONFIG_DRAM_SET_PARAM,
 393                                       0, 0, 0, 0, &res);
 394                         if (res.a0) {
 395                                 dev_err(dev, "Failed to set dram param: %ld\n",
 396                                         res.a0);
 397                                 return -EINVAL;
 398                         }
 399                 }
 400         }
 401
 402         arm_smccc_smc(ROCKCHIP_SIP_DRAM_FREQ, 0, 0,
 403                       ROCKCHIP_SIP_CONFIG_DRAM_INIT,
 404                       0, 0, 0, 0, &res);
 405
 406         /*
 407          * We add a devfreq driver to our parent since it has a device tree node
 408          * with operating points.
 409          */
 410         if (dev_pm_opp_of_add_table(dev)) {
 411                 dev_err(dev, "Invalid operating-points in device tree.\n");
 412                 return -EINVAL;
 413         }
 414
 415         of_property_read_u32(np, "upthreshold",
 416                              &data->ondemand_data.upthreshold);
 417         of_property_read_u32(np, "downdifferential",
 418                              &data->ondemand_data.downdifferential);
 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                 return PTR_ERR(opp);
 425
 426         data->rate = dev_pm_opp_get_freq(opp);
 427         data->volt = dev_pm_opp_get_voltage(opp);
 428         dev_pm_opp_put(opp);
 429
 430         rk3399_devfreq_dmc_profile.initial_freq = data->rate;
 431
 432         data->devfreq = devm_devfreq_add_device(dev,
 433                                            &rk3399_devfreq_dmc_profile,
 434                                            "simple_ondemand",
 435                                            &data->ondemand_data);
 436         if (IS_ERR(data->devfreq))
 437                 return PTR_ERR(data->devfreq);
 438         devm_devfreq_register_opp_notifier(dev, data->devfreq);
 439
 440         data->dev = dev;
 441         platform_set_drvdata(pdev, data);
 442
 443         return 0;
 444 }
 445
 446 static const struct of_device_id rk3399dmc_devfreq_of_match[] = {
 447         { .compatible = "rockchip,rk3399-dmc" },
 448         { },
 449 };
 450 MODULE_DEVICE_TABLE(of, rk3399dmc_devfreq_of_match);
 451
 452 static struct platform_driver rk3399_dmcfreq_driver = {
 453         .probe  = rk3399_dmcfreq_probe,
 454         .driver = {
 455                 .name   = "rk3399-dmc-freq",
 456                 .pm     = &rk3399_dmcfreq_pm,
 457                 .of_match_table = rk3399dmc_devfreq_of_match,
 458         },
 459 };
 460 module_platform_driver(rk3399_dmcfreq_driver);
 461
 462 MODULE_LICENSE("GPL v2");
 463 MODULE_AUTHOR("Lin Huang <hl@rock-chips.com>");
 464 MODULE_DESCRIPTION("RK3399 dmcfreq driver with devfreq framework");