drivers/soc/amlogic/meson-gx-pwrc-vpu.c

   1 /*
   2  * Copyright (c) 2017 BayLibre, SAS
   3  * Author: Neil Armstrong <narmstrong@baylibre.com>
   4  *
   5  * SPDX-License-Identifier: GPL-2.0+
   6  */
   7
   8 #include <linux/of_address.h>
   9 #include <linux/platform_device.h>
  10 #include <linux/pm_domain.h>
  11 #include <linux/bitfield.h>
  12 #include <linux/regmap.h>
  13 #include <linux/mfd/syscon.h>
  14 #include <linux/of_device.h>
  15 #include <linux/reset.h>
  16 #include <linux/clk.h>
  17 #include <linux/module.h>
  18
  19 /* AO Offsets */
  20
  21 #define AO_RTI_GEN_PWR_SLEEP0           (0x3a << 2)
  22
  23 #define GEN_PWR_VPU_HDMI                BIT(8)
  24 #define GEN_PWR_VPU_HDMI_ISO            BIT(9)
  25
  26 /* HHI Offsets */
  27
  28 #define HHI_MEM_PD_REG0                 (0x40 << 2)
  29 #define HHI_VPU_MEM_PD_REG0             (0x41 << 2)
  30 #define HHI_VPU_MEM_PD_REG1             (0x42 << 2)
  31 #define HHI_VPU_MEM_PD_REG2             (0x4d << 2)
  32
  33 struct meson_gx_pwrc_vpu {
  34         struct generic_pm_domain genpd;
  35         struct regmap *regmap_ao;
  36         struct regmap *regmap_hhi;
  37         struct reset_control *rstc;
  38         struct clk *vpu_clk;
  39         struct clk *vapb_clk;
  40 };
  41
  42 static inline
  43 struct meson_gx_pwrc_vpu *genpd_to_pd(struct generic_pm_domain *d)
  44 {
  45         return container_of(d, struct meson_gx_pwrc_vpu, genpd);
  46 }
  47
  48 static int meson_gx_pwrc_vpu_power_off(struct generic_pm_domain *genpd)
  49 {
  50         struct meson_gx_pwrc_vpu *pd = genpd_to_pd(genpd);
  51         int i;
  52
  53         regmap_update_bits(pd->regmap_ao, AO_RTI_GEN_PWR_SLEEP0,
  54                            GEN_PWR_VPU_HDMI_ISO, GEN_PWR_VPU_HDMI_ISO);
  55         udelay(20);
  56
  57         /* Power Down Memories */
  58         for (i = 0; i < 32; i += 2) {
  59                 regmap_update_bits(pd->regmap_hhi, HHI_VPU_MEM_PD_REG0,
  60                                    0x3 << i, 0x3 << i);
  61                 udelay(5);
  62         }
  63         for (i = 0; i < 32; i += 2) {
  64                 regmap_update_bits(pd->regmap_hhi, HHI_VPU_MEM_PD_REG1,
  65                                    0x3 << i, 0x3 << i);
  66                 udelay(5);
  67         }
  68         for (i = 8; i < 16; i++) {
  69                 regmap_update_bits(pd->regmap_hhi, HHI_MEM_PD_REG0,
  70                                    BIT(i), BIT(i));
  71                 udelay(5);
  72         }
  73         udelay(20);
  74
  75         regmap_update_bits(pd->regmap_ao, AO_RTI_GEN_PWR_SLEEP0,
  76                            GEN_PWR_VPU_HDMI, GEN_PWR_VPU_HDMI);
  77
  78         msleep(20);
  79
  80         clk_disable_unprepare(pd->vpu_clk);
  81         clk_disable_unprepare(pd->vapb_clk);
  82
  83         return 0;
  84 }
  85
  86 static int meson_g12a_pwrc_vpu_power_off(struct generic_pm_domain *genpd)
  87 {
  88         struct meson_gx_pwrc_vpu *pd = genpd_to_pd(genpd);
  89         int i;
  90
  91         regmap_update_bits(pd->regmap_ao, AO_RTI_GEN_PWR_SLEEP0,
  92                            GEN_PWR_VPU_HDMI_ISO, GEN_PWR_VPU_HDMI_ISO);
  93         udelay(20);
  94
  95         /* Power Down Memories */
  96         for (i = 0; i < 32; i += 2) {
  97                 regmap_update_bits(pd->regmap_hhi, HHI_VPU_MEM_PD_REG0,
  98                                    0x3 << i, 0x3 << i);
  99                 udelay(5);
 100         }
 101         for (i = 0; i < 32; i += 2) {
 102                 regmap_update_bits(pd->regmap_hhi, HHI_VPU_MEM_PD_REG1,
 103                                    0x3 << i, 0x3 << i);
 104                 udelay(5);
 105         }
 106         for (i = 0; i < 32; i += 2) {
 107                 regmap_update_bits(pd->regmap_hhi, HHI_VPU_MEM_PD_REG2,
 108                                    0x3 << i, 0x3 << i);
 109                 udelay(5);
 110         }
 111         for (i = 8; i < 16; i++) {
 112                 regmap_update_bits(pd->regmap_hhi, HHI_MEM_PD_REG0,
 113                                    BIT(i), BIT(i));
 114                 udelay(5);
 115         }
 116         udelay(20);
 117
 118         regmap_update_bits(pd->regmap_ao, AO_RTI_GEN_PWR_SLEEP0,
 119                            GEN_PWR_VPU_HDMI, GEN_PWR_VPU_HDMI);
 120
 121         msleep(20);
 122
 123         clk_disable_unprepare(pd->vpu_clk);
 124         clk_disable_unprepare(pd->vapb_clk);
 125
 126         return 0;
 127 }
 128
 129 static int meson_gx_pwrc_vpu_setup_clk(struct meson_gx_pwrc_vpu *pd)
 130 {
 131         int ret;
 132
 133         ret = clk_prepare_enable(pd->vpu_clk);
 134         if (ret)
 135                 return ret;
 136
 137         ret = clk_prepare_enable(pd->vapb_clk);
 138         if (ret)
 139                 clk_disable_unprepare(pd->vpu_clk);
 140
 141         return ret;
 142 }
 143
 144 static int meson_gx_pwrc_vpu_power_on(struct generic_pm_domain *genpd)
 145 {
 146         struct meson_gx_pwrc_vpu *pd = genpd_to_pd(genpd);
 147         int ret;
 148         int i;
 149
 150         regmap_update_bits(pd->regmap_ao, AO_RTI_GEN_PWR_SLEEP0,
 151                            GEN_PWR_VPU_HDMI, 0);
 152         udelay(20);
 153
 154         /* Power Up Memories */
 155         for (i = 0; i < 32; i += 2) {
 156                 regmap_update_bits(pd->regmap_hhi, HHI_VPU_MEM_PD_REG0,
 157                                    0x3 << i, 0);
 158                 udelay(5);
 159         }
 160
 161         for (i = 0; i < 32; i += 2) {
 162                 regmap_update_bits(pd->regmap_hhi, HHI_VPU_MEM_PD_REG1,
 163                                    0x3 << i, 0);
 164                 udelay(5);
 165         }
 166
 167         for (i = 8; i < 16; i++) {
 168                 regmap_update_bits(pd->regmap_hhi, HHI_MEM_PD_REG0,
 169                                    BIT(i), 0);
 170                 udelay(5);
 171         }
 172         udelay(20);
 173
 174         ret = reset_control_assert(pd->rstc);
 175         if (ret)
 176                 return ret;
 177
 178         regmap_update_bits(pd->regmap_ao, AO_RTI_GEN_PWR_SLEEP0,
 179                            GEN_PWR_VPU_HDMI_ISO, 0);
 180
 181         ret = reset_control_deassert(pd->rstc);
 182         if (ret)
 183                 return ret;
 184
 185         ret = meson_gx_pwrc_vpu_setup_clk(pd);
 186         if (ret)
 187                 return ret;
 188
 189         return 0;
 190 }
 191
 192 static int meson_g12a_pwrc_vpu_power_on(struct generic_pm_domain *genpd)
 193 {
 194         struct meson_gx_pwrc_vpu *pd = genpd_to_pd(genpd);
 195         int ret;
 196         int i;
 197
 198         regmap_update_bits(pd->regmap_ao, AO_RTI_GEN_PWR_SLEEP0,
 199                            GEN_PWR_VPU_HDMI, 0);
 200         udelay(20);
 201
 202         /* Power Up Memories */
 203         for (i = 0; i < 32; i += 2) {
 204                 regmap_update_bits(pd->regmap_hhi, HHI_VPU_MEM_PD_REG0,
 205                                    0x3 << i, 0);
 206                 udelay(5);
 207         }
 208
 209         for (i = 0; i < 32; i += 2) {
 210                 regmap_update_bits(pd->regmap_hhi, HHI_VPU_MEM_PD_REG1,
 211                                    0x3 << i, 0);
 212                 udelay(5);
 213         }
 214
 215         for (i = 0; i < 32; i += 2) {
 216                 regmap_update_bits(pd->regmap_hhi, HHI_VPU_MEM_PD_REG2,
 217                                    0x3 << i, 0);
 218                 udelay(5);
 219         }
 220
 221         for (i = 8; i < 16; i++) {
 222                 regmap_update_bits(pd->regmap_hhi, HHI_MEM_PD_REG0,
 223                                    BIT(i), 0);
 224                 udelay(5);
 225         }
 226         udelay(20);
 227
 228         ret = reset_control_assert(pd->rstc);
 229         if (ret)
 230                 return ret;
 231
 232         regmap_update_bits(pd->regmap_ao, AO_RTI_GEN_PWR_SLEEP0,
 233                            GEN_PWR_VPU_HDMI_ISO, 0);
 234
 235         ret = reset_control_deassert(pd->rstc);
 236         if (ret)
 237                 return ret;
 238
 239         ret = meson_gx_pwrc_vpu_setup_clk(pd);
 240         if (ret)
 241                 return ret;
 242
 243         return 0;
 244 }
 245
 246 static bool meson_gx_pwrc_vpu_get_power(struct meson_gx_pwrc_vpu *pd)
 247 {
 248         u32 reg;
 249
 250         regmap_read(pd->regmap_ao, AO_RTI_GEN_PWR_SLEEP0, &reg);
 251
 252         return (reg & GEN_PWR_VPU_HDMI);
 253 }
 254
 255 static struct meson_gx_pwrc_vpu vpu_hdmi_pd = {
 256         .genpd = {
 257                 .name = "vpu_hdmi",
 258                 .power_off = meson_gx_pwrc_vpu_power_off,
 259                 .power_on = meson_gx_pwrc_vpu_power_on,
 260         },
 261 };
 262
 263 static struct meson_gx_pwrc_vpu vpu_hdmi_pd_g12a = {
 264         .genpd = {
 265                 .name = "vpu_hdmi",
 266                 .power_off = meson_g12a_pwrc_vpu_power_off,
 267                 .power_on = meson_g12a_pwrc_vpu_power_on,
 268         },
 269 };
 270
 271 static int meson_gx_pwrc_vpu_probe(struct platform_device *pdev)
 272 {
 273         const struct meson_gx_pwrc_vpu *vpu_pd_match;
 274         struct regmap *regmap_ao, *regmap_hhi;
 275         struct meson_gx_pwrc_vpu *vpu_pd;
 276         struct reset_control *rstc;
 277         struct clk *vpu_clk;
 278         struct clk *vapb_clk;
 279         bool powered_off;
 280         int ret;
 281
 282         vpu_pd_match = of_device_get_match_data(&pdev->dev);
 283         if (!vpu_pd_match) {
 284                 dev_err(&pdev->dev, "failed to get match data\n");
 285                 return -ENODEV;
 286         }
 287
 288         vpu_pd = devm_kzalloc(&pdev->dev, sizeof(*vpu_pd), GFP_KERNEL);
 289         if (!vpu_pd)
 290                 return -ENOMEM;
 291
 292         memcpy(vpu_pd, vpu_pd_match, sizeof(*vpu_pd));
 293
 294         regmap_ao = syscon_node_to_regmap(of_get_parent(pdev->dev.of_node));
 295         if (IS_ERR(regmap_ao)) {
 296                 dev_err(&pdev->dev, "failed to get regmap\n");
 297                 return PTR_ERR(regmap_ao);
 298         }
 299
 300         regmap_hhi = syscon_regmap_lookup_by_phandle(pdev->dev.of_node,
 301                                                      "amlogic,hhi-sysctrl");
 302         if (IS_ERR(regmap_hhi)) {
 303                 dev_err(&pdev->dev, "failed to get HHI regmap\n");
 304                 return PTR_ERR(regmap_hhi);
 305         }
 306
 307         rstc = devm_reset_control_array_get_exclusive(&pdev->dev);
 308         if (IS_ERR(rstc)) {
 309                 if (PTR_ERR(rstc) != -EPROBE_DEFER)
 310                         dev_err(&pdev->dev, "failed to get reset lines\n");
 311                 return PTR_ERR(rstc);
 312         }
 313
 314         vpu_clk = devm_clk_get(&pdev->dev, "vpu");
 315         if (IS_ERR(vpu_clk)) {
 316                 dev_err(&pdev->dev, "vpu clock request failed\n");
 317                 return PTR_ERR(vpu_clk);
 318         }
 319
 320         vapb_clk = devm_clk_get(&pdev->dev, "vapb");
 321         if (IS_ERR(vapb_clk)) {
 322                 dev_err(&pdev->dev, "vapb clock request failed\n");
 323                 return PTR_ERR(vapb_clk);
 324         }
 325
 326         vpu_pd->regmap_ao = regmap_ao;
 327         vpu_pd->regmap_hhi = regmap_hhi;
 328         vpu_pd->rstc = rstc;
 329         vpu_pd->vpu_clk = vpu_clk;
 330         vpu_pd->vapb_clk = vapb_clk;
 331
 332         platform_set_drvdata(pdev, vpu_pd);
 333
 334         powered_off = meson_gx_pwrc_vpu_get_power(vpu_pd);
 335
 336         /* If already powered, sync the clock states */
 337         if (!powered_off) {
 338                 ret = meson_gx_pwrc_vpu_setup_clk(vpu_pd);
 339                 if (ret)
 340                         return ret;
 341         }
 342
 343         vpu_pd->genpd.flags = GENPD_FLAG_ALWAYS_ON;
 344         pm_genpd_init(&vpu_pd->genpd, NULL, powered_off);
 345
 346         return of_genpd_add_provider_simple(pdev->dev.of_node,
 347                                             &vpu_pd->genpd);
 348 }
 349
 350 static void meson_gx_pwrc_vpu_shutdown(struct platform_device *pdev)
 351 {
 352         struct meson_gx_pwrc_vpu *vpu_pd = platform_get_drvdata(pdev);
 353         bool powered_off;
 354
 355         powered_off = meson_gx_pwrc_vpu_get_power(vpu_pd);
 356         if (!powered_off)
 357                 vpu_pd->genpd.power_off(&vpu_pd->genpd);
 358 }
 359
 360 static const struct of_device_id meson_gx_pwrc_vpu_match_table[] = {
 361         { .compatible = "amlogic,meson-gx-pwrc-vpu", .data = &vpu_hdmi_pd },
 362         {
 363           .compatible = "amlogic,meson-g12a-pwrc-vpu",
 364           .data = &vpu_hdmi_pd_g12a
 365         },
 366         { /* sentinel */ }
 367 };
 368 MODULE_DEVICE_TABLE(of, meson_gx_pwrc_vpu_match_table);
 369
 370 static struct platform_driver meson_gx_pwrc_vpu_driver = {
 371         .probe  = meson_gx_pwrc_vpu_probe,
 372         .shutdown = meson_gx_pwrc_vpu_shutdown,
 373         .driver = {
 374                 .name           = "meson_gx_pwrc_vpu",
 375                 .of_match_table = meson_gx_pwrc_vpu_match_table,
 376         },
 377 };
 378 module_platform_driver(meson_gx_pwrc_vpu_driver);
 379 MODULE_LICENSE("GPL v2");