@@ -10,3 +10,20 @@ menuconfig POWER_SEQUENCING
during power-up.
If unsure, say no.
+
+if POWER_SEQUENCING
+
+config POWER_SEQUENCING_QCOM_WCN
+ tristate "Qualcomm WCN family PMU driver"
+ default m if ARCH_QCOM
+ help
+ Say Y here to enable the power sequencing driver for Qualcomm
+ WCN Bluetooth/WLAN chipsets.
+
+ Typically, a package from the Qualcomm WCN family contains the BT
+ and WLAN modules whose power is controlled by the PMU module. As the
+ former two share the power-up sequence which is executed by the PMU,
+ this driver is needed for correct power control or else we'd risk not
+ respecting the required delays between enabling Bluetooth and WLAN.
+
+endif
@@ -2,3 +2,5 @@
obj-$(CONFIG_POWER_SEQUENCING) += pwrseq-core.o
pwrseq-core-y := core.o
+
+obj-$(CONFIG_POWER_SEQUENCING_QCOM_WCN) += pwrseq-qcom-wcn.o
new file mode 100644
@@ -0,0 +1,336 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2024 Linaro Ltd.
+ */
+
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/gpio/consumer.h>
+#include <linux/jiffies.h>
+#include <linux/mod_devicetable.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/regulator/consumer.h>
+#include <linux/pwrseq/provider.h>
+#include <linux/string.h>
+#include <linux/types.h>
+
+struct pwrseq_qcom_wcn_pdata {
+ const char *const *vregs;
+ size_t num_vregs;
+ unsigned int pwup_delay_ms;
+ unsigned int gpio_enable_delay_ms;
+};
+
+struct pwrseq_qcom_wcn_ctx {
+ struct pwrseq_device *pwrseq;
+ struct device_node *of_node;
+ const struct pwrseq_qcom_wcn_pdata *pdata;
+ struct regulator_bulk_data *regs;
+ struct gpio_desc *bt_gpio;
+ struct gpio_desc *wlan_gpio;
+ struct clk *clk;
+ unsigned long last_gpio_enable_jf;
+};
+
+static void pwrseq_qcom_wcn_ensure_gpio_delay(struct pwrseq_qcom_wcn_ctx *ctx)
+{
+ unsigned long diff_jiffies;
+ unsigned int diff_msecs;
+
+ if (!ctx->pdata->gpio_enable_delay_ms)
+ return;
+
+ diff_jiffies = jiffies - ctx->last_gpio_enable_jf;
+ diff_msecs = jiffies_to_msecs(diff_jiffies);
+
+ if (diff_msecs < ctx->pdata->gpio_enable_delay_ms)
+ msleep(ctx->pdata->gpio_enable_delay_ms - diff_msecs);
+}
+
+static int pwrseq_qcom_wcn_vregs_enable(struct pwrseq_device *pwrseq)
+{
+ struct pwrseq_qcom_wcn_ctx *ctx = pwrseq_device_get_drvdata(pwrseq);
+
+ return regulator_bulk_enable(ctx->pdata->num_vregs, ctx->regs);
+}
+
+static int pwrseq_qcom_wcn_vregs_disable(struct pwrseq_device *pwrseq)
+{
+ struct pwrseq_qcom_wcn_ctx *ctx = pwrseq_device_get_drvdata(pwrseq);
+
+ return regulator_bulk_disable(ctx->pdata->num_vregs, ctx->regs);
+}
+
+static const struct pwrseq_unit_data pwrseq_qcom_wcn_vregs_unit_data = {
+ .name = "regulators-enable",
+ .enable = pwrseq_qcom_wcn_vregs_enable,
+ .disable = pwrseq_qcom_wcn_vregs_disable,
+};
+
+static int pwrseq_qcom_wcn_clk_enable(struct pwrseq_device *pwrseq)
+{
+ struct pwrseq_qcom_wcn_ctx *ctx = pwrseq_device_get_drvdata(pwrseq);
+
+ return clk_prepare_enable(ctx->clk);
+}
+
+static int pwrseq_qcom_wcn_clk_disable(struct pwrseq_device *pwrseq)
+{
+ struct pwrseq_qcom_wcn_ctx *ctx = pwrseq_device_get_drvdata(pwrseq);
+
+ clk_disable_unprepare(ctx->clk);
+
+ return 0;
+}
+
+static const struct pwrseq_unit_data pwrseq_qcom_wcn_clk_unit_data = {
+ .name = "clock-enable",
+ .enable = pwrseq_qcom_wcn_clk_enable,
+ .disable = pwrseq_qcom_wcn_clk_disable,
+};
+
+static const struct pwrseq_unit_data *pwrseq_qcom_wcn_unit_deps[] = {
+ &pwrseq_qcom_wcn_vregs_unit_data,
+ &pwrseq_qcom_wcn_clk_unit_data,
+ NULL
+};
+
+static int pwrseq_qcom_wcn_bt_enable(struct pwrseq_device *pwrseq)
+{
+ struct pwrseq_qcom_wcn_ctx *ctx = pwrseq_device_get_drvdata(pwrseq);
+
+ pwrseq_qcom_wcn_ensure_gpio_delay(ctx);
+ gpiod_set_value_cansleep(ctx->bt_gpio, 1);
+ ctx->last_gpio_enable_jf = jiffies;
+
+ return 0;
+}
+
+static int pwrseq_qcom_wcn_bt_disable(struct pwrseq_device *pwrseq)
+{
+ struct pwrseq_qcom_wcn_ctx *ctx = pwrseq_device_get_drvdata(pwrseq);
+
+ gpiod_set_value_cansleep(ctx->bt_gpio, 0);
+
+ return 0;
+}
+
+static const struct pwrseq_unit_data pwrseq_qcom_wcn_bt_unit_data = {
+ .name = "bluetooth-enable",
+ .deps = pwrseq_qcom_wcn_unit_deps,
+ .enable = pwrseq_qcom_wcn_bt_enable,
+ .disable = pwrseq_qcom_wcn_bt_disable,
+};
+
+static int pwrseq_qcom_wcn_wlan_enable(struct pwrseq_device *pwrseq)
+{
+ struct pwrseq_qcom_wcn_ctx *ctx = pwrseq_device_get_drvdata(pwrseq);
+
+ pwrseq_qcom_wcn_ensure_gpio_delay(ctx);
+ gpiod_set_value_cansleep(ctx->wlan_gpio, 1);
+ ctx->last_gpio_enable_jf = jiffies;
+
+ return 0;
+}
+
+static int pwrseq_qcom_wcn_wlan_disable(struct pwrseq_device *pwrseq)
+{
+ struct pwrseq_qcom_wcn_ctx *ctx = pwrseq_device_get_drvdata(pwrseq);
+
+ gpiod_set_value_cansleep(ctx->wlan_gpio, 0);
+
+ return 0;
+}
+
+static const struct pwrseq_unit_data pwrseq_qcom_wcn_wlan_unit_data = {
+ .name = "wlan-enable",
+ .deps = pwrseq_qcom_wcn_unit_deps,
+ .enable = pwrseq_qcom_wcn_wlan_enable,
+ .disable = pwrseq_qcom_wcn_wlan_disable,
+};
+
+static int pwrseq_qcom_wcn_pwup_delay(struct pwrseq_device *pwrseq)
+{
+ struct pwrseq_qcom_wcn_ctx *ctx = pwrseq_device_get_drvdata(pwrseq);
+
+ if (ctx->pdata->pwup_delay_ms)
+ msleep(ctx->pdata->pwup_delay_ms);
+
+ return 0;
+}
+
+static const struct pwrseq_target_data pwrseq_qcom_wcn_bt_target_data = {
+ .name = "bluetooth",
+ .unit = &pwrseq_qcom_wcn_bt_unit_data,
+ .post_enable = pwrseq_qcom_wcn_pwup_delay,
+};
+
+static const struct pwrseq_target_data pwrseq_qcom_wcn_wlan_target_data = {
+ .name = "wlan",
+ .unit = &pwrseq_qcom_wcn_wlan_unit_data,
+ .post_enable = pwrseq_qcom_wcn_pwup_delay,
+};
+
+static const struct pwrseq_target_data *pwrseq_qcom_wcn_targets[] = {
+ &pwrseq_qcom_wcn_bt_target_data,
+ &pwrseq_qcom_wcn_wlan_target_data,
+ NULL
+};
+
+static const char *const pwrseq_qca6390_vregs[] = {
+ "vddio",
+ "vddaon",
+ "vddpmu",
+ "vddrfa0p95",
+ "vddrfa1p3",
+ "vddrfa1p9",
+ "vddpcie1p3",
+ "vddpcie1p9",
+};
+
+static const struct pwrseq_qcom_wcn_pdata pwrseq_qca6390_of_data = {
+ .vregs = pwrseq_qca6390_vregs,
+ .num_vregs = ARRAY_SIZE(pwrseq_qca6390_vregs),
+ .pwup_delay_ms = 60,
+ .gpio_enable_delay_ms = 100,
+};
+
+static const char *const pwrseq_wcn7850_vregs[] = {
+ "vdd",
+ "vddio",
+ "vddio1p2",
+ "vddaon",
+ "vdddig",
+ "vddrfa1p2",
+ "vddrfa1p8",
+};
+
+static const struct pwrseq_qcom_wcn_pdata pwrseq_wcn7850_of_data = {
+ .vregs = pwrseq_wcn7850_vregs,
+ .num_vregs = ARRAY_SIZE(pwrseq_wcn7850_vregs),
+ .pwup_delay_ms = 50,
+};
+
+static int pwrseq_qcom_wcn_match(struct pwrseq_device *pwrseq,
+ struct device *dev)
+{
+ struct pwrseq_qcom_wcn_ctx *ctx = pwrseq_device_get_drvdata(pwrseq);
+ struct device_node *dev_node = dev->of_node;
+
+ /*
+ * The PMU supplies power to the Bluetooth and WLAN modules. both
+ * consume the PMU AON output so check the presence of the
+ * 'vddaon-supply' property and whether it leads us to the right
+ * device.
+ */
+ if (!of_property_present(dev_node, "vddaon-supply"))
+ return 0;
+
+ struct device_node *reg_node __free(device_node) =
+ of_parse_phandle(dev_node, "vddaon-supply", 0);
+ if (!reg_node)
+ return 0;
+
+ /*
+ * `reg_node` is the PMU AON regulator, its parent is the `regulators`
+ * node and finally its grandparent is the PMU device node that we're
+ * looking for.
+ */
+ if (!reg_node->parent || !reg_node->parent->parent ||
+ reg_node->parent->parent != ctx->of_node)
+ return 0;
+
+ return 1;
+}
+
+static int pwrseq_qcom_wcn_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct pwrseq_qcom_wcn_ctx *ctx;
+ struct pwrseq_config config;
+ int i, ret;
+
+ ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
+ if (!ctx)
+ return -ENOMEM;
+
+ ctx->of_node = dev->of_node;
+
+ ctx->pdata = of_device_get_match_data(dev);
+ if (!ctx->pdata)
+ return dev_err_probe(dev, -ENODEV,
+ "Failed to obtain platform data\n");
+
+ ctx->regs = devm_kcalloc(dev, ctx->pdata->num_vregs,
+ sizeof(*ctx->regs), GFP_KERNEL);
+ if (!ctx->regs)
+ return -ENOMEM;
+
+ for (i = 0; i < ctx->pdata->num_vregs; i++)
+ ctx->regs[i].supply = ctx->pdata->vregs[i];
+
+ ret = devm_regulator_bulk_get(dev, ctx->pdata->num_vregs, ctx->regs);
+ if (ret < 0)
+ return dev_err_probe(dev, ret,
+ "Failed to get all regulators\n");
+
+ ctx->bt_gpio = devm_gpiod_get_optional(dev, "bt-enable", GPIOD_OUT_LOW);
+ if (IS_ERR(ctx->bt_gpio))
+ return dev_err_probe(dev, PTR_ERR(ctx->bt_gpio),
+ "Failed to get the Bluetooth enable GPIO\n");
+
+ ctx->wlan_gpio = devm_gpiod_get_optional(dev, "wlan-enable",
+ GPIOD_OUT_LOW);
+ if (IS_ERR(ctx->wlan_gpio))
+ return dev_err_probe(dev, PTR_ERR(ctx->wlan_gpio),
+ "Failed to get the WLAN enable GPIO\n");
+
+ ctx->clk = devm_clk_get_optional(dev, NULL);
+ if (IS_ERR(ctx->clk))
+ return dev_err_probe(dev, PTR_ERR(ctx->clk),
+ "Failed to get the reference clock\n");
+
+ memset(&config, 0, sizeof(config));
+
+ config.parent = dev;
+ config.owner = THIS_MODULE;
+ config.drvdata = ctx;
+ config.match = pwrseq_qcom_wcn_match;
+ config.targets = pwrseq_qcom_wcn_targets;
+
+ ctx->pwrseq = devm_pwrseq_device_register(dev, &config);
+ if (IS_ERR(ctx->pwrseq))
+ return dev_err_probe(dev, PTR_ERR(ctx->pwrseq),
+ "Failed to register the power sequencer\n");
+
+ return 0;
+}
+
+static const struct of_device_id pwrseq_qcom_wcn_of_match[] = {
+ {
+ .compatible = "qcom,qca6390-pmu",
+ .data = &pwrseq_qca6390_of_data,
+ },
+ {
+ .compatible = "qcom,wcn7850-pmu",
+ .data = &pwrseq_wcn7850_of_data,
+ },
+ { }
+};
+MODULE_DEVICE_TABLE(of, pwrseq_qcom_wcn_of_match);
+
+static struct platform_driver pwrseq_qcom_wcn_driver = {
+ .driver = {
+ .name = "pwrseq-qcom_wcn",
+ .of_match_table = pwrseq_qcom_wcn_of_match,
+ },
+ .probe = pwrseq_qcom_wcn_probe,
+};
+module_platform_driver(pwrseq_qcom_wcn_driver);
+
+MODULE_AUTHOR("Bartosz Golaszewski <bartosz.golaszewski@linaro.org>");
+MODULE_DESCRIPTION("Qualcomm WCN PMU power sequencing driver");
+MODULE_LICENSE("GPL");