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Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Kalle Valo , Bjorn Andersson , Konrad Dybcio , Liam Girdwood , Mark Brown , Catalin Marinas , Will Deacon , Bjorn Helgaas , Bartosz Golaszewski , Saravana Kannan , Geert Uytterhoeven , Arnd Bergmann , Neil Armstrong , Marek Szyprowski , Alex Elder , Srini Kandagatla , Greg Kroah-Hartman , Abel Vesa , Manivannan Sadhasivam , Lukas Wunner , Dmitry Baryshkov Cc: linux-bluetooth@vger.kernel.org, netdev@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-wireless@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-pci@vger.kernel.org, linux-pm@vger.kernel.org, Bartosz Golaszewski Subject: [PATCH v5 14/18] PCI/pwrctl: add a power control driver for WCN7850 Date: Fri, 16 Feb 2024 21:32:11 +0100 Message-Id: <20240216203215.40870-15-brgl@bgdev.pl> X-Mailer: git-send-email 2.40.1 In-Reply-To: <20240216203215.40870-1-brgl@bgdev.pl> References: <20240216203215.40870-1-brgl@bgdev.pl> Precedence: bulk X-Mailing-List: linux-bluetooth@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: Bartosz Golaszewski 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 --- 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 +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +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 "); +MODULE_DESCRIPTION("PCI Power Sequencing module for WCN7850"); +MODULE_LICENSE("GPL");