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1// SPDX-License-Identifier: GPL-2.0-only2/*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 20struct 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 27struct 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 38static 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 53static 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 60static 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 67static 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 73static 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 80static 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 89static 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 95static 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 NULL99};100 101static 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 112static 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 121static 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 128static 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 139static 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 148static 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 155static 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 165static 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 171static 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 177static const struct pwrseq_target_data *pwrseq_qcom_wcn_targets[] = {178 &pwrseq_qcom_wcn_bt_target_data,179 &pwrseq_qcom_wcn_wlan_target_data,180 NULL181};182 183static const char *const pwrseq_qca6390_vregs[] = {184 "vddio",185 "vddaon",186 "vddpmu",187 "vddrfa0p95",188 "vddrfa1p3",189 "vddrfa1p9",190 "vddpcie1p3",191 "vddpcie1p9",192};193 194static 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 201static const struct pwrseq_qcom_wcn_pdata pwrseq_wcn6855_of_data = {202 .vregs = pwrseq_qca6390_vregs,203 .num_vregs = ARRAY_SIZE(pwrseq_qca6390_vregs),204 .pwup_delay_ms = 50,205 .gpio_enable_delay_ms = 5,206};207 208static const char *const pwrseq_wcn7850_vregs[] = {209 "vdd",210 "vddio",211 "vddio1p2",212 "vddaon",213 "vdddig",214 "vddrfa1p2",215 "vddrfa1p8",216};217 218static const struct pwrseq_qcom_wcn_pdata pwrseq_wcn7850_of_data = {219 .vregs = pwrseq_wcn7850_vregs,220 .num_vregs = ARRAY_SIZE(pwrseq_wcn7850_vregs),221 .pwup_delay_ms = 50,222};223 224static int pwrseq_qcom_wcn_match(struct pwrseq_device *pwrseq,225 struct device *dev)226{227 struct pwrseq_qcom_wcn_ctx *ctx = pwrseq_device_get_drvdata(pwrseq);228 struct device_node *dev_node = dev->of_node;229 230 /*231 * The PMU supplies power to the Bluetooth and WLAN modules. both232 * consume the PMU AON output so check the presence of the233 * 'vddaon-supply' property and whether it leads us to the right234 * device.235 */236 if (!of_property_present(dev_node, "vddaon-supply"))237 return 0;238 239 struct device_node *reg_node __free(device_node) =240 of_parse_phandle(dev_node, "vddaon-supply", 0);241 if (!reg_node)242 return 0;243 244 /*245 * `reg_node` is the PMU AON regulator, its parent is the `regulators`246 * node and finally its grandparent is the PMU device node that we're247 * looking for.248 */249 if (!reg_node->parent || !reg_node->parent->parent ||250 reg_node->parent->parent != ctx->of_node)251 return 0;252 253 return 1;254}255 256static int pwrseq_qcom_wcn_probe(struct platform_device *pdev)257{258 struct device *dev = &pdev->dev;259 struct pwrseq_qcom_wcn_ctx *ctx;260 struct pwrseq_config config;261 int i, ret;262 263 ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);264 if (!ctx)265 return -ENOMEM;266 267 ctx->of_node = dev->of_node;268 269 ctx->pdata = of_device_get_match_data(dev);270 if (!ctx->pdata)271 return dev_err_probe(dev, -ENODEV,272 "Failed to obtain platform data\n");273 274 ctx->regs = devm_kcalloc(dev, ctx->pdata->num_vregs,275 sizeof(*ctx->regs), GFP_KERNEL);276 if (!ctx->regs)277 return -ENOMEM;278 279 for (i = 0; i < ctx->pdata->num_vregs; i++)280 ctx->regs[i].supply = ctx->pdata->vregs[i];281 282 ret = devm_regulator_bulk_get(dev, ctx->pdata->num_vregs, ctx->regs);283 if (ret < 0)284 return dev_err_probe(dev, ret,285 "Failed to get all regulators\n");286 287 ctx->bt_gpio = devm_gpiod_get_optional(dev, "bt-enable", GPIOD_OUT_LOW);288 if (IS_ERR(ctx->bt_gpio))289 return dev_err_probe(dev, PTR_ERR(ctx->bt_gpio),290 "Failed to get the Bluetooth enable GPIO\n");291 292 ctx->wlan_gpio = devm_gpiod_get_optional(dev, "wlan-enable",293 GPIOD_ASIS);294 if (IS_ERR(ctx->wlan_gpio))295 return dev_err_probe(dev, PTR_ERR(ctx->wlan_gpio),296 "Failed to get the WLAN enable GPIO\n");297 298 /*299 * Set direction to output but keep the current value in order to not300 * disable the WLAN module accidentally if it's already powered on.301 */302 gpiod_direction_output(ctx->wlan_gpio,303 gpiod_get_value_cansleep(ctx->wlan_gpio));304 305 ctx->clk = devm_clk_get_optional(dev, NULL);306 if (IS_ERR(ctx->clk))307 return dev_err_probe(dev, PTR_ERR(ctx->clk),308 "Failed to get the reference clock\n");309 310 memset(&config, 0, sizeof(config));311 312 config.parent = dev;313 config.owner = THIS_MODULE;314 config.drvdata = ctx;315 config.match = pwrseq_qcom_wcn_match;316 config.targets = pwrseq_qcom_wcn_targets;317 318 ctx->pwrseq = devm_pwrseq_device_register(dev, &config);319 if (IS_ERR(ctx->pwrseq))320 return dev_err_probe(dev, PTR_ERR(ctx->pwrseq),321 "Failed to register the power sequencer\n");322 323 return 0;324}325 326static const struct of_device_id pwrseq_qcom_wcn_of_match[] = {327 {328 .compatible = "qcom,qca6390-pmu",329 .data = &pwrseq_qca6390_of_data,330 },331 {332 .compatible = "qcom,wcn6855-pmu",333 .data = &pwrseq_wcn6855_of_data,334 },335 {336 .compatible = "qcom,wcn7850-pmu",337 .data = &pwrseq_wcn7850_of_data,338 },339 { }340};341MODULE_DEVICE_TABLE(of, pwrseq_qcom_wcn_of_match);342 343static struct platform_driver pwrseq_qcom_wcn_driver = {344 .driver = {345 .name = "pwrseq-qcom_wcn",346 .of_match_table = pwrseq_qcom_wcn_of_match,347 },348 .probe = pwrseq_qcom_wcn_probe,349};350module_platform_driver(pwrseq_qcom_wcn_driver);351 352MODULE_AUTHOR("Bartosz Golaszewski <bartosz.golaszewski@linaro.org>");353MODULE_DESCRIPTION("Qualcomm WCN PMU power sequencing driver");354MODULE_LICENSE("GPL");355