meson-clkc-utils.c

  1// SPDX-License-Identifier: GPL-2.0+
  2/*
  3 * Copyright (c) 2023 Neil Armstrong <neil.armstrong@linaro.org>
  4 */
  5
  6#include <linux/clk-provider.h>
  7#include <linux/mfd/syscon.h>
  8#include <linux/module.h>
  9#include <linux/of_device.h>
 10#include <linux/platform_device.h>
 11#include <linux/regmap.h>
 12
 13#include "meson-clkc-utils.h"
 14
 15struct clk_hw *meson_clk_hw_get(struct of_phandle_args *clkspec, void *clk_hw_data)
 16{
 17	const struct meson_clk_hw_data *data = clk_hw_data;
 18	unsigned int idx = clkspec->args[0];
 19
 20	if (idx >= data->num) {
 21		pr_err("%s: invalid index %u\n", __func__, idx);
 22		return ERR_PTR(-EINVAL);
 23	}
 24
 25	return data->hws[idx];
 26}
 27EXPORT_SYMBOL_NS_GPL(meson_clk_hw_get, "CLK_MESON");
 28
 29static int meson_clkc_init(struct device *dev, struct regmap *map)
 30{
 31	const struct meson_clkc_data *data;
 32	struct clk_hw *hw;
 33	int ret, i;
 34
 35	data = of_device_get_match_data(dev);
 36	if (!data)
 37		return -EINVAL;
 38
 39	if (data->init_count)
 40		regmap_multi_reg_write(map, data->init_regs, data->init_count);
 41
 42	for (i = 0; i < data->hw_clks.num; i++) {
 43		hw = data->hw_clks.hws[i];
 44
 45		/* array might be sparse */
 46		if (!hw)
 47			continue;
 48
 49		ret = devm_clk_hw_register(dev, hw);
 50		if (ret) {
 51			dev_err(dev, "registering %s clock failed\n",
 52				hw->init->name);
 53			return ret;
 54		}
 55	}
 56
 57	return devm_of_clk_add_hw_provider(dev, meson_clk_hw_get, (void *)&data->hw_clks);
 58}
 59
 60int meson_clkc_syscon_probe(struct platform_device *pdev)
 61{
 62	struct device *dev = &pdev->dev;
 63	struct device_node *np;
 64	struct regmap *map;
 65
 66	np = of_get_parent(dev->of_node);
 67	map = syscon_node_to_regmap(np);
 68	of_node_put(np);
 69	if (IS_ERR(map)) {
 70		dev_err(dev, "failed to get parent syscon regmap\n");
 71		return PTR_ERR(map);
 72	}
 73
 74	return meson_clkc_init(dev, map);
 75}
 76EXPORT_SYMBOL_NS_GPL(meson_clkc_syscon_probe, "CLK_MESON");
 77
 78int meson_clkc_mmio_probe(struct platform_device *pdev)
 79{
 80	const struct meson_clkc_data *data;
 81	struct device *dev = &pdev->dev;
 82	struct resource *res;
 83	void __iomem *base;
 84	struct regmap *map;
 85	struct regmap_config regmap_cfg = {
 86			.reg_bits	= 32,
 87			.val_bits	= 32,
 88			.reg_stride	= 4,
 89	};
 90
 91	data = of_device_get_match_data(dev);
 92	if (!data)
 93		return -EINVAL;
 94
 95	base = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
 96	if (IS_ERR(base))
 97		return PTR_ERR(base);
 98
 99	regmap_cfg.max_register = resource_size(res) - regmap_cfg.reg_stride;
100
101	map = devm_regmap_init_mmio(dev, base, &regmap_cfg);
102	if (IS_ERR(map))
103		return PTR_ERR(map);
104
105	return meson_clkc_init(dev, map);
106}
107EXPORT_SYMBOL_NS_GPL(meson_clkc_mmio_probe, "CLK_MESON");
108
109MODULE_DESCRIPTION("Amlogic Clock Controller Utilities");
110MODULE_LICENSE("GPL");
111MODULE_IMPORT_NS("CLK_MESON");