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1// SPDX-License-Identifier: GPL-2.02//3// Copyright (c) 2018 Samsung Electronics Co., Ltd.4// Author: Marek Szyprowski <m.szyprowski@samsung.com>5// Common Clock Framework support for Exynos5 power-domain dependent clocks6 7#include <linux/io.h>8#include <linux/of.h>9#include <linux/platform_device.h>10#include <linux/pm_domain.h>11#include <linux/pm_runtime.h>12 13#include "clk.h"14#include "clk-exynos5-subcmu.h"15 16static struct samsung_clk_provider *ctx;17static const struct exynos5_subcmu_info **cmu;18static int nr_cmus;19 20static void exynos5_subcmu_clk_save(void __iomem *base,21				    struct exynos5_subcmu_reg_dump *rd,22				    unsigned int num_regs)23{24	for (; num_regs > 0; --num_regs, ++rd) {25		rd->save = readl(base + rd->offset);26		writel((rd->save & ~rd->mask) | rd->value, base + rd->offset);27		rd->save &= rd->mask;28	}29};30 31static void exynos5_subcmu_clk_restore(void __iomem *base,32				       struct exynos5_subcmu_reg_dump *rd,33				       unsigned int num_regs)34{35	for (; num_regs > 0; --num_regs, ++rd)36		writel((readl(base + rd->offset) & ~rd->mask) | rd->save,37		       base + rd->offset);38}39 40static void exynos5_subcmu_defer_gate(struct samsung_clk_provider *ctx,41			      const struct samsung_gate_clock *list, int nr_clk)42{43	while (nr_clk--)44		samsung_clk_add_lookup(ctx, ERR_PTR(-EPROBE_DEFER), list++->id);45}46 47/*48 * Pass the needed clock provider context and register sub-CMU clocks49 *50 * NOTE: This function has to be called from the main, CLK_OF_DECLARE-51 * initialized clock provider driver. This happens very early during boot52 * process. Then this driver, during core_initcall registers two platform53 * drivers: one which binds to the same device-tree node as CLK_OF_DECLARE54 * driver and second, for handling its per-domain child-devices. Those55 * platform drivers are bound to their devices a bit later in arch_initcall,56 * when OF-core populates all device-tree nodes.57 */58void exynos5_subcmus_init(struct samsung_clk_provider *_ctx, int _nr_cmus,59			  const struct exynos5_subcmu_info **_cmu)60{61	ctx = _ctx;62	cmu = _cmu;63	nr_cmus = _nr_cmus;64 65	for (; _nr_cmus--; _cmu++) {66		exynos5_subcmu_defer_gate(ctx, (*_cmu)->gate_clks,67					  (*_cmu)->nr_gate_clks);68		exynos5_subcmu_clk_save(ctx->reg_base, (*_cmu)->suspend_regs,69					(*_cmu)->nr_suspend_regs);70	}71}72 73static int __maybe_unused exynos5_subcmu_suspend(struct device *dev)74{75	struct exynos5_subcmu_info *info = dev_get_drvdata(dev);76	unsigned long flags;77 78	spin_lock_irqsave(&ctx->lock, flags);79	exynos5_subcmu_clk_save(ctx->reg_base, info->suspend_regs,80				info->nr_suspend_regs);81	spin_unlock_irqrestore(&ctx->lock, flags);82 83	return 0;84}85 86static int __maybe_unused exynos5_subcmu_resume(struct device *dev)87{88	struct exynos5_subcmu_info *info = dev_get_drvdata(dev);89	unsigned long flags;90 91	spin_lock_irqsave(&ctx->lock, flags);92	exynos5_subcmu_clk_restore(ctx->reg_base, info->suspend_regs,93				   info->nr_suspend_regs);94	spin_unlock_irqrestore(&ctx->lock, flags);95 96	return 0;97}98 99static int __init exynos5_subcmu_probe(struct platform_device *pdev)100{101	struct device *dev = &pdev->dev;102	struct exynos5_subcmu_info *info = dev_get_drvdata(dev);103 104	pm_runtime_set_suspended(dev);105	pm_runtime_enable(dev);106	pm_runtime_get(dev);107 108	ctx->dev = dev;109	samsung_clk_register_div(ctx, info->div_clks, info->nr_div_clks);110	samsung_clk_register_gate(ctx, info->gate_clks, info->nr_gate_clks);111	ctx->dev = NULL;112 113	pm_runtime_put_sync(dev);114 115	return 0;116}117 118static const struct dev_pm_ops exynos5_subcmu_pm_ops = {119	SET_RUNTIME_PM_OPS(exynos5_subcmu_suspend,120			   exynos5_subcmu_resume, NULL)121	SET_LATE_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,122				     pm_runtime_force_resume)123};124 125static struct platform_driver exynos5_subcmu_driver __refdata = {126	.driver	= {127		.name = "exynos5-subcmu",128		.suppress_bind_attrs = true,129		.pm = &exynos5_subcmu_pm_ops,130	},131	.probe = exynos5_subcmu_probe,132};133 134static int __init exynos5_clk_register_subcmu(struct device *parent,135					 const struct exynos5_subcmu_info *info,136					      struct device_node *pd_node)137{138	struct of_phandle_args genpdspec = { .np = pd_node };139	struct platform_device *pdev;140	int ret;141 142	pdev = platform_device_alloc("exynos5-subcmu", PLATFORM_DEVID_AUTO);143	if (!pdev)144		return -ENOMEM;145 146	pdev->dev.parent = parent;147	platform_set_drvdata(pdev, (void *)info);148	of_genpd_add_device(&genpdspec, &pdev->dev);149	ret = platform_device_add(pdev);150	if (ret)151		platform_device_put(pdev);152 153	return ret;154}155 156static int __init exynos5_clk_probe(struct platform_device *pdev)157{158	struct device_node *np;159	const char *name;160	int i;161 162	for_each_compatible_node(np, NULL, "samsung,exynos4210-pd") {163		if (of_property_read_string(np, "label", &name) < 0)164			continue;165		for (i = 0; i < nr_cmus; i++)166			if (strcmp(cmu[i]->pd_name, name) == 0)167				exynos5_clk_register_subcmu(&pdev->dev,168							    cmu[i], np);169	}170	return 0;171}172 173static const struct of_device_id exynos5_clk_of_match[] = {174	{ .compatible = "samsung,exynos5250-clock", },175	{ .compatible = "samsung,exynos5420-clock", },176	{ .compatible = "samsung,exynos5800-clock", },177	{ },178};179 180static struct platform_driver exynos5_clk_driver __refdata = {181	.driver	= {182		.name = "exynos5-clock",183		.of_match_table = exynos5_clk_of_match,184		.suppress_bind_attrs = true,185	},186	.probe = exynos5_clk_probe,187};188 189static int __init exynos5_clk_drv_init(void)190{191	platform_driver_register(&exynos5_clk_driver);192	platform_driver_register(&exynos5_subcmu_driver);193	return 0;194}195core_initcall(exynos5_clk_drv_init);196