[PATCH v5 14/18] PCI/pwrctl: add a power control driver for WCN7850

Bartosz Golaszewski
2024-02-16T20:33:35Z

From: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>

Add a PCI power control driver that's capable of correctly powering up
the ath12k module on WCN7850 using the PCI pwrctl functionality.

Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
---
drivers/pci/pwrctl/Kconfig | 8 +
drivers/pci/pwrctl/Makefile | 2 +
drivers/pci/pwrctl/pci-pwrctl-wcn7850.c | 202 ++++++++++++++++++++++++
3 files changed, 212 insertions(+)
create mode 100644 drivers/pci/pwrctl/pci-pwrctl-wcn7850.c

diff --git a/drivers/pci/pwrctl/Kconfig b/drivers/pci/pwrctl/Kconfig
index 96195395af69..b91170ebfb49 100644
--- a/drivers/pci/pwrctl/Kconfig
+++ b/drivers/pci/pwrctl/Kconfig
@@ -5,4 +5,12 @@ menu "PCI Power control drivers"
config PCI_PWRCTL
tristate

+config PCI_PWRCTL_WCN7850
+ tristate "PCI Power Control driver for WCN7850"
+ select PCI_PWRCTL
+ default m if (ATH12K && ARCH_QCOM)
+ help
+ Enable support for the PCI power control driver for the ath12k
+ module of the WCN7850 WLAN/BT chip.
+
endmenu
diff --git a/drivers/pci/pwrctl/Makefile b/drivers/pci/pwrctl/Makefile
index 52ae0640ef7b..de20c3af1b78 100644
--- a/drivers/pci/pwrctl/Makefile
+++ b/drivers/pci/pwrctl/Makefile
@@ -2,3 +2,5 @@

obj-$(CONFIG_PCI_PWRCTL) += pci-pwrctl-core.o
pci-pwrctl-core-y := core.o
+
+obj-$(CONFIG_PCI_PWRCTL_WCN7850) += pci-pwrctl-wcn7850.o
diff --git a/drivers/pci/pwrctl/pci-pwrctl-wcn7850.c b/drivers/pci/pwrctl/pci-pwrctl-wcn7850.c
new file mode 100644
index 000000000000..e2b2c53bff29
--- /dev/null
+++ b/drivers/pci/pwrctl/pci-pwrctl-wcn7850.c
@@ -0,0 +1,202 @@
+// 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/mod_devicetable.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/pci-pwrctl.h>
+#include <linux/platform_device.h>
+#include <linux/regulator/consumer.h>
+#include <linux/slab.h>
+#include <linux/types.h>
+
+struct pci_pwrctl_wcn7850_vreg {
+ const char *name;
+ unsigned int load_uA;
+};
+
+struct pci_pwrctl_wcn7850_pdata {
+ struct pci_pwrctl_wcn7850_vreg *vregs;
+ size_t num_vregs;
+ unsigned int delay_msec;
+};
+
+struct pci_pwrctl_wcn7850_ctx {
+ struct pci_pwrctl pwrctl;
+ const struct pci_pwrctl_wcn7850_pdata *pdata;
+ struct regulator_bulk_data *regs;
+ struct gpio_desc *en_gpio;
+ struct clk *clk;
+};
+
+static struct pci_pwrctl_wcn7850_vreg pci_pwrctl_wcn7850_vregs[] = {
+ {
+ .name = "vdd",
+ .load_uA = 16000,
+ },
+ {
+ .name = "vddio",
+ .load_uA = 5000,
+ },
+ {
+ .name = "vddio1p2",
+ .load_uA = 16000,
+ },
+ {
+ .name = "vddaon",
+ .load_uA = 26000,
+ },
+ {
+ .name = "vdddig",
+ .load_uA = 126000,
+ },
+ {
+ .name = "vddrfa1p2",
+ .load_uA = 257000,
+ },
+ {
+ .name = "vddrfa1p8",
+ .load_uA = 302000,
+ },
+};
+
+static struct pci_pwrctl_wcn7850_pdata pci_pwrctl_wcn7850_of_data = {
+ .vregs = pci_pwrctl_wcn7850_vregs,
+ .num_vregs = ARRAY_SIZE(pci_pwrctl_wcn7850_vregs),
+ .delay_msec = 50,
+};
+
+static int pci_pwrctl_wcn7850_power_on(struct pci_pwrctl_wcn7850_ctx *ctx)
+{
+ int ret;
+
+ ret = regulator_bulk_enable(ctx->pdata->num_vregs, ctx->regs);
+ if (ret)
+ return ret;
+
+ ret = clk_prepare_enable(ctx->clk);
+ if (ret)
+ return ret;
+
+ gpiod_set_value_cansleep(ctx->en_gpio, 1);
+
+ if (ctx->pdata->delay_msec)
+ msleep(ctx->pdata->delay_msec);
+
+ return 0;
+}
+
+static int pci_pwrctl_wcn7850_power_off(struct pci_pwrctl_wcn7850_ctx *ctx)
+{
+ gpiod_set_value_cansleep(ctx->en_gpio, 0);
+ clk_disable_unprepare(ctx->clk);
+
+ return regulator_bulk_disable(ctx->pdata->num_vregs, ctx->regs);
+}
+
+static void devm_pci_pwrctl_wcn7850_power_off(void *data)
+{
+ struct pci_pwrctl_wcn7850_ctx *ctx = data;
+
+ pci_pwrctl_wcn7850_power_off(ctx);
+}
+
+static int pci_pwrctl_wcn7850_probe(struct platform_device *pdev)
+{
+ struct pci_pwrctl_wcn7850_ctx *ctx;
+ struct device *dev = &pdev->dev;
+ int ret, i;
+
+ ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
+ if (!ctx)
+ return -ENOMEM;
+
+ ctx->pdata = of_device_get_match_data(dev);
+ if (!ctx->pdata)
+ return dev_err_probe(dev, -ENODEV,
+ "Failed to obtain platform data\n");
+
+ if (ctx->pdata->vregs) {
+ 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].name;
+
+ 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");
+
+ for (i = 0; i < ctx->pdata->num_vregs; i++) {
+ if (!ctx->pdata->vregs[1].load_uA)
+ continue;
+
+ ret = regulator_set_load(ctx->regs[i].consumer,
+ ctx->pdata->vregs[i].load_uA);
+ if (ret)
+ return dev_err_probe(dev, ret,
+ "Failed to set vreg load\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 clock\n");
+
+ ctx->en_gpio = devm_gpiod_get_optional(dev, "enable", GPIOD_OUT_LOW);
+ if (IS_ERR(ctx->en_gpio))
+ return dev_err_probe(dev, PTR_ERR(ctx->en_gpio),
+ "Failed to get enable the GPIO\n");
+
+ ret = pci_pwrctl_wcn7850_power_on(ctx);
+ if (ret)
+ return dev_err_probe(dev, ret,
+ "Failed to power on the device\n");
+
+ ret = devm_add_action_or_reset(dev, devm_pci_pwrctl_wcn7850_power_off,
+ ctx);
+ if (ret)
+ return ret;
+
+ ctx->pwrctl.dev = dev;
+
+ ret = devm_pci_pwrctl_device_set_ready(dev, &ctx->pwrctl);
+ if (ret)
+ return dev_err_probe(dev, ret,
+ "Failed to register the pwrctl wrapper\n");
+
+ return 0;
+}
+
+static const struct of_device_id pci_pwrctl_wcn7850_of_match[] = {
+ {
+ .compatible = "pci17cb,1107",
+ .data = &pci_pwrctl_wcn7850_of_data,
+ },
+ { }
+};
+MODULE_DEVICE_TABLE(of, pci_pwrctl_wcn7850_of_match);
+
+static struct platform_driver pci_pwrctl_wcn7850_driver = {
+ .driver = {
+ .name = "pci-pwrctl-wcn7850",
+ .of_match_table = pci_pwrctl_wcn7850_of_match,
+ },
+ .probe = pci_pwrctl_wcn7850_probe,
+};
+module_platform_driver(pci_pwrctl_wcn7850_driver);
+
+MODULE_AUTHOR("Bartosz Golaszewski <bartosz.golaszewski@linaro.org>");
+MODULE_DESCRIPTION("PCI Power Sequencing module for WCN7850");
+MODULE_LICENSE("GPL");
--
2.40.1