drivers/power/sequencing/pwrseq-qcom-wcn.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) 2024 Linaro Ltd.
   4  */
   5
   6 #include <linux/clk.h>
   7 #include <linux/delay.h>
   8 #include <linux/device.h>
   9 #include <linux/gpio/consumer.h>
  10 #include <linux/jiffies.h>
  11 #include <linux/mod_devicetable.h>
  12 #include <linux/module.h>
  13 #include <linux/of.h>
  14 #include <linux/platform_device.h>
  15 #include <linux/regulator/consumer.h>
  16 #include <linux/pwrseq/provider.h>
  17 #include <linux/string.h>
  18 #include <linux/types.h>
  19
  20 struct pwrseq_qcom_wcn_pdata {
  21         const char *const *vregs;
  22         size_t num_vregs;
  23         unsigned int pwup_delay_ms;
  24         unsigned int gpio_enable_delay_ms;
  25 };
  26
  27 struct pwrseq_qcom_wcn_ctx {
  28         struct pwrseq_device *pwrseq;
  29         struct device_node *of_node;
  30         const struct pwrseq_qcom_wcn_pdata *pdata;
  31         struct regulator_bulk_data *regs;
  32         struct gpio_desc *bt_gpio;
  33         struct gpio_desc *wlan_gpio;
  34         struct clk *clk;
  35         unsigned long last_gpio_enable_jf;
  36 };
  37
  38 static void pwrseq_qcom_wcn_ensure_gpio_delay(struct pwrseq_qcom_wcn_ctx *ctx)
  39 {
  40         unsigned long diff_jiffies;
  41         unsigned int diff_msecs;
  42
  43         if (!ctx->pdata->gpio_enable_delay_ms)
  44                 return;
  45
  46         diff_jiffies = jiffies - ctx->last_gpio_enable_jf;
  47         diff_msecs = jiffies_to_msecs(diff_jiffies);
  48
  49         if (diff_msecs < ctx->pdata->gpio_enable_delay_ms)
  50                 msleep(ctx->pdata->gpio_enable_delay_ms - diff_msecs);
  51 }
  52
  53 static int pwrseq_qcom_wcn_vregs_enable(struct pwrseq_device *pwrseq)
  54 {
  55         struct pwrseq_qcom_wcn_ctx *ctx = pwrseq_device_get_drvdata(pwrseq);
  56
  57         return regulator_bulk_enable(ctx->pdata->num_vregs, ctx->regs);
  58 }
  59
  60 static int pwrseq_qcom_wcn_vregs_disable(struct pwrseq_device *pwrseq)
  61 {
  62         struct pwrseq_qcom_wcn_ctx *ctx = pwrseq_device_get_drvdata(pwrseq);
  63
  64         return regulator_bulk_disable(ctx->pdata->num_vregs, ctx->regs);
  65 }
  66
  67 static const struct pwrseq_unit_data pwrseq_qcom_wcn_vregs_unit_data = {
  68         .name = "regulators-enable",
  69         .enable = pwrseq_qcom_wcn_vregs_enable,
  70         .disable = pwrseq_qcom_wcn_vregs_disable,
  71 };
  72
  73 static int pwrseq_qcom_wcn_clk_enable(struct pwrseq_device *pwrseq)
  74 {
  75         struct pwrseq_qcom_wcn_ctx *ctx = pwrseq_device_get_drvdata(pwrseq);
  76
  77         return clk_prepare_enable(ctx->clk);
  78 }
  79
  80 static int pwrseq_qcom_wcn_clk_disable(struct pwrseq_device *pwrseq)
  81 {
  82         struct pwrseq_qcom_wcn_ctx *ctx = pwrseq_device_get_drvdata(pwrseq);
  83
  84         clk_disable_unprepare(ctx->clk);
  85
  86         return 0;
  87 }
  88
  89 static const struct pwrseq_unit_data pwrseq_qcom_wcn_clk_unit_data = {
  90         .name = "clock-enable",
  91         .enable = pwrseq_qcom_wcn_clk_enable,
  92         .disable = pwrseq_qcom_wcn_clk_disable,
  93 };
  94
  95 static const struct pwrseq_unit_data *pwrseq_qcom_wcn_unit_deps[] = {
  96         &pwrseq_qcom_wcn_vregs_unit_data,
  97         &pwrseq_qcom_wcn_clk_unit_data,
  98         NULL
  99 };
 100
 101 static int pwrseq_qcom_wcn_bt_enable(struct pwrseq_device *pwrseq)
 102 {
 103         struct pwrseq_qcom_wcn_ctx *ctx = pwrseq_device_get_drvdata(pwrseq);
 104
 105         pwrseq_qcom_wcn_ensure_gpio_delay(ctx);
 106         gpiod_set_value_cansleep(ctx->bt_gpio, 1);
 107         ctx->last_gpio_enable_jf = jiffies;
 108
 109         return 0;
 110 }
 111
 112 static int pwrseq_qcom_wcn_bt_disable(struct pwrseq_device *pwrseq)
 113 {
 114         struct pwrseq_qcom_wcn_ctx *ctx = pwrseq_device_get_drvdata(pwrseq);
 115
 116         gpiod_set_value_cansleep(ctx->bt_gpio, 0);
 117
 118         return 0;
 119 }
 120
 121 static const struct pwrseq_unit_data pwrseq_qcom_wcn_bt_unit_data = {
 122         .name = "bluetooth-enable",
 123         .deps = pwrseq_qcom_wcn_unit_deps,
 124         .enable = pwrseq_qcom_wcn_bt_enable,
 125         .disable = pwrseq_qcom_wcn_bt_disable,
 126 };
 127
 128 static int pwrseq_qcom_wcn_wlan_enable(struct pwrseq_device *pwrseq)
 129 {
 130         struct pwrseq_qcom_wcn_ctx *ctx = pwrseq_device_get_drvdata(pwrseq);
 131
 132         pwrseq_qcom_wcn_ensure_gpio_delay(ctx);
 133         gpiod_set_value_cansleep(ctx->wlan_gpio, 1);
 134         ctx->last_gpio_enable_jf = jiffies;
 135
 136         return 0;
 137 }
 138
 139 static int pwrseq_qcom_wcn_wlan_disable(struct pwrseq_device *pwrseq)
 140 {
 141         struct pwrseq_qcom_wcn_ctx *ctx = pwrseq_device_get_drvdata(pwrseq);
 142
 143         gpiod_set_value_cansleep(ctx->wlan_gpio, 0);
 144
 145         return 0;
 146 }
 147
 148 static const struct pwrseq_unit_data pwrseq_qcom_wcn_wlan_unit_data = {
 149         .name = "wlan-enable",
 150         .deps = pwrseq_qcom_wcn_unit_deps,
 151         .enable = pwrseq_qcom_wcn_wlan_enable,
 152         .disable = pwrseq_qcom_wcn_wlan_disable,
 153 };
 154
 155 static int pwrseq_qcom_wcn_pwup_delay(struct pwrseq_device *pwrseq)
 156 {
 157         struct pwrseq_qcom_wcn_ctx *ctx = pwrseq_device_get_drvdata(pwrseq);
 158
 159         if (ctx->pdata->pwup_delay_ms)
 160                 msleep(ctx->pdata->pwup_delay_ms);
 161
 162         return 0;
 163 }
 164
 165 static const struct pwrseq_target_data pwrseq_qcom_wcn_bt_target_data = {
 166         .name = "bluetooth",
 167         .unit = &pwrseq_qcom_wcn_bt_unit_data,
 168         .post_enable = pwrseq_qcom_wcn_pwup_delay,
 169 };
 170
 171 static const struct pwrseq_target_data pwrseq_qcom_wcn_wlan_target_data = {
 172         .name = "wlan",
 173         .unit = &pwrseq_qcom_wcn_wlan_unit_data,
 174         .post_enable = pwrseq_qcom_wcn_pwup_delay,
 175 };
 176
 177 static const struct pwrseq_target_data *pwrseq_qcom_wcn_targets[] = {
 178         &pwrseq_qcom_wcn_bt_target_data,
 179         &pwrseq_qcom_wcn_wlan_target_data,
 180         NULL
 181 };
 182
 183 static const char *const pwrseq_qca6390_vregs[] = {
 184         "vddio",
 185         "vddaon",
 186         "vddpmu",
 187         "vddrfa0p95",
 188         "vddrfa1p3",
 189         "vddrfa1p9",
 190         "vddpcie1p3",
 191         "vddpcie1p9",
 192 };
 193
 194 static const struct pwrseq_qcom_wcn_pdata pwrseq_qca6390_of_data = {
 195         .vregs = pwrseq_qca6390_vregs,
 196         .num_vregs = ARRAY_SIZE(pwrseq_qca6390_vregs),
 197         .pwup_delay_ms = 60,
 198         .gpio_enable_delay_ms = 100,
 199 };
 200
 201 static const char *const pwrseq_wcn7850_vregs[] = {
 202         "vdd",
 203         "vddio",
 204         "vddio1p2",
 205         "vddaon",
 206         "vdddig",
 207         "vddrfa1p2",
 208         "vddrfa1p8",
 209 };
 210
 211 static const struct pwrseq_qcom_wcn_pdata pwrseq_wcn7850_of_data = {
 212         .vregs = pwrseq_wcn7850_vregs,
 213         .num_vregs = ARRAY_SIZE(pwrseq_wcn7850_vregs),
 214         .pwup_delay_ms = 50,
 215 };
 216
 217 static int pwrseq_qcom_wcn_match(struct pwrseq_device *pwrseq,
 218                                  struct device *dev)
 219 {
 220         struct pwrseq_qcom_wcn_ctx *ctx = pwrseq_device_get_drvdata(pwrseq);
 221         struct device_node *dev_node = dev->of_node;
 222
 223         /*
 224          * The PMU supplies power to the Bluetooth and WLAN modules. both
 225          * consume the PMU AON output so check the presence of the
 226          * 'vddaon-supply' property and whether it leads us to the right
 227          * device.
 228          */
 229         if (!of_property_present(dev_node, "vddaon-supply"))
 230                 return 0;
 231
 232         struct device_node *reg_node __free(device_node) =
 233                         of_parse_phandle(dev_node, "vddaon-supply", 0);
 234         if (!reg_node)
 235                 return 0;
 236
 237         /*
 238          * `reg_node` is the PMU AON regulator, its parent is the `regulators`
 239          * node and finally its grandparent is the PMU device node that we're
 240          * looking for.
 241          */
 242         if (!reg_node->parent || !reg_node->parent->parent ||
 243             reg_node->parent->parent != ctx->of_node)
 244                 return 0;
 245
 246         return 1;
 247 }
 248
 249 static int pwrseq_qcom_wcn_probe(struct platform_device *pdev)
 250 {
 251         struct device *dev = &pdev->dev;
 252         struct pwrseq_qcom_wcn_ctx *ctx;
 253         struct pwrseq_config config;
 254         int i, ret;
 255
 256         ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
 257         if (!ctx)
 258                 return -ENOMEM;
 259
 260         ctx->of_node = dev->of_node;
 261
 262         ctx->pdata = of_device_get_match_data(dev);
 263         if (!ctx->pdata)
 264                 return dev_err_probe(dev, -ENODEV,
 265                                      "Failed to obtain platform data\n");
 266
 267         ctx->regs = devm_kcalloc(dev, ctx->pdata->num_vregs,
 268                                  sizeof(*ctx->regs), GFP_KERNEL);
 269         if (!ctx->regs)
 270                 return -ENOMEM;
 271
 272         for (i = 0; i < ctx->pdata->num_vregs; i++)
 273                 ctx->regs[i].supply = ctx->pdata->vregs[i];
 274
 275         ret = devm_regulator_bulk_get(dev, ctx->pdata->num_vregs, ctx->regs);
 276         if (ret < 0)
 277                 return dev_err_probe(dev, ret,
 278                                      "Failed to get all regulators\n");
 279
 280         ctx->bt_gpio = devm_gpiod_get_optional(dev, "bt-enable", GPIOD_OUT_LOW);
 281         if (IS_ERR(ctx->bt_gpio))
 282                 return dev_err_probe(dev, PTR_ERR(ctx->bt_gpio),
 283                                      "Failed to get the Bluetooth enable GPIO\n");
 284
 285         ctx->wlan_gpio = devm_gpiod_get_optional(dev, "wlan-enable",
 286                                                  GPIOD_OUT_LOW);
 287         if (IS_ERR(ctx->wlan_gpio))
 288                 return dev_err_probe(dev, PTR_ERR(ctx->wlan_gpio),
 289                                      "Failed to get the WLAN enable GPIO\n");
 290
 291         ctx->clk = devm_clk_get_optional(dev, NULL);
 292         if (IS_ERR(ctx->clk))
 293                 return dev_err_probe(dev, PTR_ERR(ctx->clk),
 294                                      "Failed to get the reference clock\n");
 295
 296         memset(&config, 0, sizeof(config));
 297
 298         config.parent = dev;
 299         config.owner = THIS_MODULE;
 300         config.drvdata = ctx;
 301         config.match = pwrseq_qcom_wcn_match;
 302         config.targets = pwrseq_qcom_wcn_targets;
 303
 304         ctx->pwrseq = devm_pwrseq_device_register(dev, &config);
 305         if (IS_ERR(ctx->pwrseq))
 306                 return dev_err_probe(dev, PTR_ERR(ctx->pwrseq),
 307                                      "Failed to register the power sequencer\n");
 308
 309         return 0;
 310 }
 311
 312 static const struct of_device_id pwrseq_qcom_wcn_of_match[] = {
 313         {
 314                 .compatible = "qcom,qca6390-pmu",
 315                 .data = &pwrseq_qca6390_of_data,
 316         },
 317         {
 318                 .compatible = "qcom,wcn7850-pmu",
 319                 .data = &pwrseq_wcn7850_of_data,
 320         },
 321         { }
 322 };
 323 MODULE_DEVICE_TABLE(of, pwrseq_qcom_wcn_of_match);
 324
 325 static struct platform_driver pwrseq_qcom_wcn_driver = {
 326         .driver = {
 327                 .name = "pwrseq-qcom_wcn",
 328                 .of_match_table = pwrseq_qcom_wcn_of_match,
 329         },
 330         .probe = pwrseq_qcom_wcn_probe,
 331 };
 332 module_platform_driver(pwrseq_qcom_wcn_driver);
 333
 334 MODULE_AUTHOR("Bartosz Golaszewski <[email protected]>");
 335 MODULE_DESCRIPTION("Qualcomm WCN PMU power sequencing driver");
 336 MODULE_LICENSE("GPL");