180 строки
4.7 KiB
C
180 строки
4.7 KiB
C
// SPDX-License-Identifier: GPL-2.0
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//
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// reset-uniphier-glue.c - Glue layer reset driver for UniPhier
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// Copyright 2018 Socionext Inc.
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// Author: Kunihiko Hayashi <hayashi.kunihiko@socionext.com>
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#include <linux/clk.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/platform_device.h>
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#include <linux/reset.h>
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#include <linux/reset/reset-simple.h>
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#define MAX_CLKS 2
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#define MAX_RSTS 2
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struct uniphier_glue_reset_soc_data {
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int nclks;
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const char * const *clock_names;
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int nrsts;
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const char * const *reset_names;
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};
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struct uniphier_glue_reset_priv {
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struct clk_bulk_data clk[MAX_CLKS];
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struct reset_control_bulk_data rst[MAX_RSTS];
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struct reset_simple_data rdata;
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const struct uniphier_glue_reset_soc_data *data;
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};
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static void uniphier_clk_disable(void *_priv)
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{
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struct uniphier_glue_reset_priv *priv = _priv;
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clk_bulk_disable_unprepare(priv->data->nclks, priv->clk);
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}
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static void uniphier_rst_assert(void *_priv)
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{
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struct uniphier_glue_reset_priv *priv = _priv;
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reset_control_bulk_assert(priv->data->nrsts, priv->rst);
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}
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static int uniphier_glue_reset_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct uniphier_glue_reset_priv *priv;
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struct resource *res;
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int i, ret;
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priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
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if (!priv)
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return -ENOMEM;
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priv->data = of_device_get_match_data(dev);
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if (WARN_ON(!priv->data || priv->data->nclks > MAX_CLKS ||
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priv->data->nrsts > MAX_RSTS))
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return -EINVAL;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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priv->rdata.membase = devm_ioremap_resource(dev, res);
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if (IS_ERR(priv->rdata.membase))
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return PTR_ERR(priv->rdata.membase);
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for (i = 0; i < priv->data->nclks; i++)
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priv->clk[i].id = priv->data->clock_names[i];
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ret = devm_clk_bulk_get(dev, priv->data->nclks, priv->clk);
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if (ret)
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return ret;
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for (i = 0; i < priv->data->nrsts; i++)
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priv->rst[i].id = priv->data->reset_names[i];
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ret = devm_reset_control_bulk_get_shared(dev, priv->data->nrsts,
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priv->rst);
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if (ret)
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return ret;
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ret = clk_bulk_prepare_enable(priv->data->nclks, priv->clk);
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if (ret)
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return ret;
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ret = devm_add_action_or_reset(dev, uniphier_clk_disable, priv);
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if (ret)
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return ret;
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ret = reset_control_bulk_deassert(priv->data->nrsts, priv->rst);
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if (ret)
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return ret;
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ret = devm_add_action_or_reset(dev, uniphier_rst_assert, priv);
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if (ret)
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return ret;
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spin_lock_init(&priv->rdata.lock);
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priv->rdata.rcdev.owner = THIS_MODULE;
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priv->rdata.rcdev.nr_resets = resource_size(res) * BITS_PER_BYTE;
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priv->rdata.rcdev.ops = &reset_simple_ops;
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priv->rdata.rcdev.of_node = dev->of_node;
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priv->rdata.active_low = true;
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return devm_reset_controller_register(dev, &priv->rdata.rcdev);
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}
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static const char * const uniphier_pro4_clock_reset_names[] = {
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"gio", "link",
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};
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static const struct uniphier_glue_reset_soc_data uniphier_pro4_data = {
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.nclks = ARRAY_SIZE(uniphier_pro4_clock_reset_names),
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.clock_names = uniphier_pro4_clock_reset_names,
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.nrsts = ARRAY_SIZE(uniphier_pro4_clock_reset_names),
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.reset_names = uniphier_pro4_clock_reset_names,
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};
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static const char * const uniphier_pxs2_clock_reset_names[] = {
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"link",
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};
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static const struct uniphier_glue_reset_soc_data uniphier_pxs2_data = {
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.nclks = ARRAY_SIZE(uniphier_pxs2_clock_reset_names),
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.clock_names = uniphier_pxs2_clock_reset_names,
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.nrsts = ARRAY_SIZE(uniphier_pxs2_clock_reset_names),
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.reset_names = uniphier_pxs2_clock_reset_names,
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};
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static const struct of_device_id uniphier_glue_reset_match[] = {
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{
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.compatible = "socionext,uniphier-pro4-usb3-reset",
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.data = &uniphier_pro4_data,
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},
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{
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.compatible = "socionext,uniphier-pro5-usb3-reset",
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.data = &uniphier_pro4_data,
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},
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{
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.compatible = "socionext,uniphier-pxs2-usb3-reset",
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.data = &uniphier_pxs2_data,
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},
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{
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.compatible = "socionext,uniphier-ld20-usb3-reset",
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.data = &uniphier_pxs2_data,
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},
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{
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.compatible = "socionext,uniphier-pxs3-usb3-reset",
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.data = &uniphier_pxs2_data,
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},
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{
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.compatible = "socionext,uniphier-nx1-usb3-reset",
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.data = &uniphier_pxs2_data,
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},
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{
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.compatible = "socionext,uniphier-pro4-ahci-reset",
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.data = &uniphier_pro4_data,
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},
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{
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.compatible = "socionext,uniphier-pxs2-ahci-reset",
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.data = &uniphier_pxs2_data,
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},
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{
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.compatible = "socionext,uniphier-pxs3-ahci-reset",
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.data = &uniphier_pxs2_data,
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},
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{ /* Sentinel */ }
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};
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MODULE_DEVICE_TABLE(of, uniphier_glue_reset_match);
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static struct platform_driver uniphier_glue_reset_driver = {
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.probe = uniphier_glue_reset_probe,
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.driver = {
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.name = "uniphier-glue-reset",
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.of_match_table = uniphier_glue_reset_match,
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},
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};
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module_platform_driver(uniphier_glue_reset_driver);
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MODULE_AUTHOR("Kunihiko Hayashi <hayashi.kunihiko@socionext.com>");
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MODULE_DESCRIPTION("UniPhier Glue layer reset driver");
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MODULE_LICENSE("GPL");
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