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127 lines
3.3 KiB
127 lines
3.3 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Broadcom STB generic reset controller for SW_INIT style reset controller |
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* |
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* Author: Florian Fainelli <[email protected]> |
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* Copyright (C) 2018 Broadcom |
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*/ |
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#include <linux/delay.h> |
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#include <linux/device.h> |
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#include <linux/io.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-controller.h> |
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#include <linux/types.h> |
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struct brcmstb_reset { |
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void __iomem *base; |
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struct reset_controller_dev rcdev; |
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}; |
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#define SW_INIT_SET 0x00 |
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#define SW_INIT_CLEAR 0x04 |
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#define SW_INIT_STATUS 0x08 |
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#define SW_INIT_BIT(id) BIT((id) & 0x1f) |
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#define SW_INIT_BANK(id) ((id) >> 5) |
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/* A full bank contains extra registers that we are not utilizing but still |
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* qualify as a single bank. |
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*/ |
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#define SW_INIT_BANK_SIZE 0x18 |
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static inline |
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struct brcmstb_reset *to_brcmstb(struct reset_controller_dev *rcdev) |
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{ |
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return container_of(rcdev, struct brcmstb_reset, rcdev); |
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} |
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static int brcmstb_reset_assert(struct reset_controller_dev *rcdev, |
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unsigned long id) |
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{ |
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unsigned int off = SW_INIT_BANK(id) * SW_INIT_BANK_SIZE; |
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struct brcmstb_reset *priv = to_brcmstb(rcdev); |
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writel_relaxed(SW_INIT_BIT(id), priv->base + off + SW_INIT_SET); |
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return 0; |
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} |
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static int brcmstb_reset_deassert(struct reset_controller_dev *rcdev, |
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unsigned long id) |
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{ |
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unsigned int off = SW_INIT_BANK(id) * SW_INIT_BANK_SIZE; |
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struct brcmstb_reset *priv = to_brcmstb(rcdev); |
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writel_relaxed(SW_INIT_BIT(id), priv->base + off + SW_INIT_CLEAR); |
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/* Maximum reset delay after de-asserting a line and seeing block |
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* operation is typically 14us for the worst case, build some slack |
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* here. |
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*/ |
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usleep_range(100, 200); |
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return 0; |
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} |
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static int brcmstb_reset_status(struct reset_controller_dev *rcdev, |
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unsigned long id) |
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{ |
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unsigned int off = SW_INIT_BANK(id) * SW_INIT_BANK_SIZE; |
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struct brcmstb_reset *priv = to_brcmstb(rcdev); |
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return readl_relaxed(priv->base + off + SW_INIT_STATUS) & |
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SW_INIT_BIT(id); |
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} |
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static const struct reset_control_ops brcmstb_reset_ops = { |
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.assert = brcmstb_reset_assert, |
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.deassert = brcmstb_reset_deassert, |
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.status = brcmstb_reset_status, |
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}; |
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static int brcmstb_reset_probe(struct platform_device *pdev) |
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{ |
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struct device *kdev = &pdev->dev; |
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struct brcmstb_reset *priv; |
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struct resource *res; |
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priv = devm_kzalloc(kdev, sizeof(*priv), GFP_KERNEL); |
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if (!priv) |
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return -ENOMEM; |
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
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priv->base = devm_ioremap_resource(kdev, res); |
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if (IS_ERR(priv->base)) |
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return PTR_ERR(priv->base); |
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dev_set_drvdata(kdev, priv); |
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priv->rcdev.owner = THIS_MODULE; |
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priv->rcdev.nr_resets = DIV_ROUND_DOWN_ULL(resource_size(res), |
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SW_INIT_BANK_SIZE) * 32; |
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priv->rcdev.ops = &brcmstb_reset_ops; |
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priv->rcdev.of_node = kdev->of_node; |
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/* Use defaults: 1 cell and simple xlate function */ |
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return devm_reset_controller_register(kdev, &priv->rcdev); |
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} |
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static const struct of_device_id brcmstb_reset_of_match[] = { |
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{ .compatible = "brcm,brcmstb-reset" }, |
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{ /* sentinel */ } |
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}; |
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MODULE_DEVICE_TABLE(of, brcmstb_reset_of_match); |
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static struct platform_driver brcmstb_reset_driver = { |
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.probe = brcmstb_reset_probe, |
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.driver = { |
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.name = "brcmstb-reset", |
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.of_match_table = brcmstb_reset_of_match, |
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}, |
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}; |
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module_platform_driver(brcmstb_reset_driver); |
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MODULE_AUTHOR("Broadcom"); |
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MODULE_DESCRIPTION("Broadcom STB reset controller"); |
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MODULE_LICENSE("GPL");
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