From ace9429bb58fd418f0c81d4c2835699bddf6bde6 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Thu, 11 Apr 2024 10:27:49 +0200 Subject: Adding upstream version 6.6.15. Signed-off-by: Daniel Baumann --- drivers/clk/samsung/clk-exynos-arm64.c | 292 +++++++++++++++++++++++++++++++++ 1 file changed, 292 insertions(+) create mode 100644 drivers/clk/samsung/clk-exynos-arm64.c (limited to 'drivers/clk/samsung/clk-exynos-arm64.c') diff --git a/drivers/clk/samsung/clk-exynos-arm64.c b/drivers/clk/samsung/clk-exynos-arm64.c new file mode 100644 index 0000000000..6fb7194df7 --- /dev/null +++ b/drivers/clk/samsung/clk-exynos-arm64.c @@ -0,0 +1,292 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (C) 2021 Linaro Ltd. + * Copyright (C) 2021 Dávid Virág + * Author: Sam Protsenko + * Author: Dávid Virág + * + * This file contains shared functions used by some arm64 Exynos SoCs, + * such as Exynos7885 or Exynos850 to register and init CMUs. + */ +#include +#include +#include +#include +#include +#include + +#include "clk-exynos-arm64.h" + +/* Gate register bits */ +#define GATE_MANUAL BIT(20) +#define GATE_ENABLE_HWACG BIT(28) + +/* Gate register offsets range */ +#define GATE_OFF_START 0x2000 +#define GATE_OFF_END 0x2fff + +struct exynos_arm64_cmu_data { + struct samsung_clk_reg_dump *clk_save; + unsigned int nr_clk_save; + const struct samsung_clk_reg_dump *clk_suspend; + unsigned int nr_clk_suspend; + + struct clk *clk; + struct clk **pclks; + int nr_pclks; + + struct samsung_clk_provider *ctx; +}; + +/** + * exynos_arm64_init_clocks - Set clocks initial configuration + * @np: CMU device tree node with "reg" property (CMU addr) + * @reg_offs: Register offsets array for clocks to init + * @reg_offs_len: Number of register offsets in reg_offs array + * + * Set manual control mode for all gate clocks. + */ +static void __init exynos_arm64_init_clocks(struct device_node *np, + const unsigned long *reg_offs, size_t reg_offs_len) +{ + void __iomem *reg_base; + size_t i; + + reg_base = of_iomap(np, 0); + if (!reg_base) + panic("%s: failed to map registers\n", __func__); + + for (i = 0; i < reg_offs_len; ++i) { + void __iomem *reg = reg_base + reg_offs[i]; + u32 val; + + /* Modify only gate clock registers */ + if (reg_offs[i] < GATE_OFF_START || reg_offs[i] > GATE_OFF_END) + continue; + + val = readl(reg); + val |= GATE_MANUAL; + val &= ~GATE_ENABLE_HWACG; + writel(val, reg); + } + + iounmap(reg_base); +} + +/** + * exynos_arm64_enable_bus_clk - Enable parent clock of specified CMU + * + * @dev: Device object; may be NULL if this function is not being + * called from platform driver probe function + * @np: CMU device tree node + * @cmu: CMU data + * + * Keep CMU parent clock running (needed for CMU registers access). + * + * Return: 0 on success or a negative error code on failure. + */ +static int __init exynos_arm64_enable_bus_clk(struct device *dev, + struct device_node *np, const struct samsung_cmu_info *cmu) +{ + struct clk *parent_clk; + + if (!cmu->clk_name) + return 0; + + if (dev) { + struct exynos_arm64_cmu_data *data; + + parent_clk = clk_get(dev, cmu->clk_name); + data = dev_get_drvdata(dev); + if (data) + data->clk = parent_clk; + } else { + parent_clk = of_clk_get_by_name(np, cmu->clk_name); + } + + if (IS_ERR(parent_clk)) + return PTR_ERR(parent_clk); + + return clk_prepare_enable(parent_clk); +} + +static int __init exynos_arm64_cmu_prepare_pm(struct device *dev, + const struct samsung_cmu_info *cmu) +{ + struct exynos_arm64_cmu_data *data = dev_get_drvdata(dev); + int i; + + data->clk_save = samsung_clk_alloc_reg_dump(cmu->clk_regs, + cmu->nr_clk_regs); + if (!data->clk_save) + return -ENOMEM; + + data->nr_clk_save = cmu->nr_clk_regs; + data->clk_suspend = cmu->suspend_regs; + data->nr_clk_suspend = cmu->nr_suspend_regs; + data->nr_pclks = of_clk_get_parent_count(dev->of_node); + if (!data->nr_pclks) + return 0; + + data->pclks = devm_kcalloc(dev, sizeof(struct clk *), data->nr_pclks, + GFP_KERNEL); + if (!data->pclks) { + kfree(data->clk_save); + return -ENOMEM; + } + + for (i = 0; i < data->nr_pclks; i++) { + struct clk *clk = of_clk_get(dev->of_node, i); + + if (IS_ERR(clk)) { + kfree(data->clk_save); + while (--i >= 0) + clk_put(data->pclks[i]); + return PTR_ERR(clk); + } + data->pclks[i] = clk; + } + + return 0; +} + +/** + * exynos_arm64_register_cmu - Register specified Exynos CMU domain + * @dev: Device object; may be NULL if this function is not being + * called from platform driver probe function + * @np: CMU device tree node + * @cmu: CMU data + * + * Register specified CMU domain, which includes next steps: + * + * 1. Enable parent clock of @cmu CMU + * 2. Set initial registers configuration for @cmu CMU clocks + * 3. Register @cmu CMU clocks using Samsung clock framework API + */ +void __init exynos_arm64_register_cmu(struct device *dev, + struct device_node *np, const struct samsung_cmu_info *cmu) +{ + int err; + + /* + * Try to boot even if the parent clock enablement fails, as it might be + * already enabled by bootloader. + */ + err = exynos_arm64_enable_bus_clk(dev, np, cmu); + if (err) + pr_err("%s: could not enable bus clock %s; err = %d\n", + __func__, cmu->clk_name, err); + + exynos_arm64_init_clocks(np, cmu->clk_regs, cmu->nr_clk_regs); + samsung_cmu_register_one(np, cmu); +} + +/** + * exynos_arm64_register_cmu_pm - Register Exynos CMU domain with PM support + * + * @pdev: Platform device object + * @set_manual: If true, set gate clocks to manual mode + * + * It's a version of exynos_arm64_register_cmu() with PM support. Should be + * called from probe function of platform driver. + * + * Return: 0 on success, or negative error code on error. + */ +int __init exynos_arm64_register_cmu_pm(struct platform_device *pdev, + bool set_manual) +{ + const struct samsung_cmu_info *cmu; + struct device *dev = &pdev->dev; + struct device_node *np = dev->of_node; + struct exynos_arm64_cmu_data *data; + void __iomem *reg_base; + int ret; + + cmu = of_device_get_match_data(dev); + + data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL); + if (!data) + return -ENOMEM; + + platform_set_drvdata(pdev, data); + + ret = exynos_arm64_cmu_prepare_pm(dev, cmu); + if (ret) + return ret; + + /* + * Try to boot even if the parent clock enablement fails, as it might be + * already enabled by bootloader. + */ + ret = exynos_arm64_enable_bus_clk(dev, NULL, cmu); + if (ret) + dev_err(dev, "%s: could not enable bus clock %s; err = %d\n", + __func__, cmu->clk_name, ret); + + if (set_manual) + exynos_arm64_init_clocks(np, cmu->clk_regs, cmu->nr_clk_regs); + + reg_base = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(reg_base)) + return PTR_ERR(reg_base); + + data->ctx = samsung_clk_init(dev, reg_base, cmu->nr_clk_ids); + + /* + * Enable runtime PM here to allow the clock core using runtime PM + * for the registered clocks. Additionally, we increase the runtime + * PM usage count before registering the clocks, to prevent the + * clock core from runtime suspending the device. + */ + pm_runtime_get_noresume(dev); + pm_runtime_set_active(dev); + pm_runtime_enable(dev); + + samsung_cmu_register_clocks(data->ctx, cmu); + samsung_clk_of_add_provider(dev->of_node, data->ctx); + pm_runtime_put_sync(dev); + + return 0; +} + +int exynos_arm64_cmu_suspend(struct device *dev) +{ + struct exynos_arm64_cmu_data *data = dev_get_drvdata(dev); + int i; + + samsung_clk_save(data->ctx->reg_base, data->clk_save, + data->nr_clk_save); + + for (i = 0; i < data->nr_pclks; i++) + clk_prepare_enable(data->pclks[i]); + + /* For suspend some registers have to be set to certain values */ + samsung_clk_restore(data->ctx->reg_base, data->clk_suspend, + data->nr_clk_suspend); + + for (i = 0; i < data->nr_pclks; i++) + clk_disable_unprepare(data->pclks[i]); + + clk_disable_unprepare(data->clk); + + return 0; +} + +int exynos_arm64_cmu_resume(struct device *dev) +{ + struct exynos_arm64_cmu_data *data = dev_get_drvdata(dev); + int i; + + clk_prepare_enable(data->clk); + + for (i = 0; i < data->nr_pclks; i++) + clk_prepare_enable(data->pclks[i]); + + samsung_clk_restore(data->ctx->reg_base, data->clk_save, + data->nr_clk_save); + + for (i = 0; i < data->nr_pclks; i++) + clk_disable_unprepare(data->pclks[i]); + + return 0; +} -- cgit v1.2.3