// 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 struct pwrseq_qcom_wcn_pdata pwrseq_wcn6855_of_data = {
.vregs = pwrseq_qca6390_vregs,
.num_vregs = ARRAY_SIZE(pwrseq_qca6390_vregs),
.pwup_delay_ms = 50,
.gpio_enable_delay_ms = 5,
};
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_ASIS);
if (IS_ERR(ctx->wlan_gpio))
return dev_err_probe(dev, PTR_ERR(ctx->wlan_gpio),
"Failed to get the WLAN enable GPIO\n");
/*
* Set direction to output but keep the current value in order to not
* disable the WLAN module accidentally if it's already powered on.
*/
gpiod_direction_output(ctx->wlan_gpio,
gpiod_get_value_cansleep(ctx->wlan_gpio));
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,wcn6855-pmu",
.data = &pwrseq_wcn6855_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 <[email protected]>");
MODULE_DESCRIPTION("Qualcomm WCN PMU power sequencing driver");
MODULE_LICENSE("GPL");
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