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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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bad8a8afe1
The DT of_device.h and of_platform.h date back to the separate of_platform_bus_type before it as merged into the regular platform bus. As part of that merge prepping Arm DT support 13 years ago, they "temporarily" include each other. They also include platform_device.h and of.h. As a result, there's a pretty much random mix of those include files used throughout the tree. In order to detangle these headers and replace the implicit includes with struct declarations, users need to explicitly include the correct includes. Signed-off-by: Rob Herring <robh@kernel.org> Reviewed-by: Damien Le Moal <dlemoal@kernel.org> Acked-by: Steen Hegelund <Steen.Hegelund@microchip.com> Link: https://lore.kernel.org/r/20230714174939.4063667-1-robh@kernel.org Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
130 lines
2.9 KiB
C
130 lines
2.9 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (c) 2020 Western Digital Corporation or its affiliates.
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*/
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#include <linux/of.h>
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#include <linux/platform_device.h>
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#include <linux/reset-controller.h>
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#include <linux/delay.h>
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#include <linux/mfd/syscon.h>
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#include <linux/regmap.h>
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#include <soc/canaan/k210-sysctl.h>
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#include <dt-bindings/reset/k210-rst.h>
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#define K210_RST_MASK 0x27FFFFFF
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struct k210_rst {
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struct regmap *map;
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struct reset_controller_dev rcdev;
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};
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static inline struct k210_rst *
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to_k210_rst(struct reset_controller_dev *rcdev)
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{
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return container_of(rcdev, struct k210_rst, rcdev);
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}
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static inline int k210_rst_assert(struct reset_controller_dev *rcdev,
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unsigned long id)
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{
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struct k210_rst *ksr = to_k210_rst(rcdev);
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return regmap_update_bits(ksr->map, K210_SYSCTL_PERI_RESET, BIT(id), 1);
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}
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static inline int k210_rst_deassert(struct reset_controller_dev *rcdev,
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unsigned long id)
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{
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struct k210_rst *ksr = to_k210_rst(rcdev);
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return regmap_update_bits(ksr->map, K210_SYSCTL_PERI_RESET, BIT(id), 0);
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}
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static int k210_rst_reset(struct reset_controller_dev *rcdev,
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unsigned long id)
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{
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int ret;
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ret = k210_rst_assert(rcdev, id);
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if (ret == 0) {
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udelay(10);
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ret = k210_rst_deassert(rcdev, id);
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}
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return ret;
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}
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static int k210_rst_status(struct reset_controller_dev *rcdev,
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unsigned long id)
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{
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struct k210_rst *ksr = to_k210_rst(rcdev);
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u32 reg, bit = BIT(id);
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int ret;
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ret = regmap_read(ksr->map, K210_SYSCTL_PERI_RESET, ®);
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if (ret)
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return ret;
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return reg & bit;
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}
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static int k210_rst_xlate(struct reset_controller_dev *rcdev,
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const struct of_phandle_args *reset_spec)
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{
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unsigned long id = reset_spec->args[0];
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if (!(BIT(id) & K210_RST_MASK))
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return -EINVAL;
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return id;
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}
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static const struct reset_control_ops k210_rst_ops = {
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.assert = k210_rst_assert,
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.deassert = k210_rst_deassert,
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.reset = k210_rst_reset,
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.status = k210_rst_status,
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};
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static int k210_rst_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct device_node *parent_np = of_get_parent(dev->of_node);
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struct k210_rst *ksr;
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dev_info(dev, "K210 reset controller\n");
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ksr = devm_kzalloc(dev, sizeof(*ksr), GFP_KERNEL);
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if (!ksr)
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return -ENOMEM;
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ksr->map = syscon_node_to_regmap(parent_np);
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of_node_put(parent_np);
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if (IS_ERR(ksr->map))
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return PTR_ERR(ksr->map);
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ksr->rcdev.owner = THIS_MODULE;
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ksr->rcdev.dev = dev;
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ksr->rcdev.of_node = dev->of_node;
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ksr->rcdev.ops = &k210_rst_ops;
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ksr->rcdev.nr_resets = fls(K210_RST_MASK);
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ksr->rcdev.of_reset_n_cells = 1;
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ksr->rcdev.of_xlate = k210_rst_xlate;
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return devm_reset_controller_register(dev, &ksr->rcdev);
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}
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static const struct of_device_id k210_rst_dt_ids[] = {
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{ .compatible = "canaan,k210-rst" },
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{ /* sentinel */ },
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};
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static struct platform_driver k210_rst_driver = {
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.probe = k210_rst_probe,
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.driver = {
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.name = "k210-rst",
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.of_match_table = k210_rst_dt_ids,
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},
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};
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builtin_platform_driver(k210_rst_driver);
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