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107 lines
2.8 KiB
107 lines
2.8 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* Copyright (C) 2018-2020 Broadcom */ |
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#include <linux/device.h> |
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#include <linux/iopoll.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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#define BRCM_RESCAL_START 0x0 |
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#define BRCM_RESCAL_START_BIT BIT(0) |
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#define BRCM_RESCAL_CTRL 0x4 |
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#define BRCM_RESCAL_STATUS 0x8 |
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#define BRCM_RESCAL_STATUS_BIT BIT(0) |
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struct brcm_rescal_reset { |
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void __iomem *base; |
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struct device *dev; |
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struct reset_controller_dev rcdev; |
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}; |
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static int brcm_rescal_reset_set(struct reset_controller_dev *rcdev, |
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unsigned long id) |
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{ |
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struct brcm_rescal_reset *data = |
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container_of(rcdev, struct brcm_rescal_reset, rcdev); |
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void __iomem *base = data->base; |
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u32 reg; |
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int ret; |
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reg = readl(base + BRCM_RESCAL_START); |
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writel(reg | BRCM_RESCAL_START_BIT, base + BRCM_RESCAL_START); |
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reg = readl(base + BRCM_RESCAL_START); |
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if (!(reg & BRCM_RESCAL_START_BIT)) { |
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dev_err(data->dev, "failed to start SATA/PCIe rescal\n"); |
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return -EIO; |
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} |
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ret = readl_poll_timeout(base + BRCM_RESCAL_STATUS, reg, |
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!(reg & BRCM_RESCAL_STATUS_BIT), 100, 1000); |
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if (ret) { |
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dev_err(data->dev, "time out on SATA/PCIe rescal\n"); |
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return ret; |
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} |
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reg = readl(base + BRCM_RESCAL_START); |
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writel(reg & ~BRCM_RESCAL_START_BIT, base + BRCM_RESCAL_START); |
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dev_dbg(data->dev, "SATA/PCIe rescal success\n"); |
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return 0; |
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} |
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static int brcm_rescal_reset_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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/* This is needed if #reset-cells == 0. */ |
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return 0; |
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} |
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static const struct reset_control_ops brcm_rescal_reset_ops = { |
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.reset = brcm_rescal_reset_set, |
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}; |
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static int brcm_rescal_reset_probe(struct platform_device *pdev) |
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{ |
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struct brcm_rescal_reset *data; |
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struct resource *res; |
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data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL); |
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if (!data) |
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return -ENOMEM; |
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
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data->base = devm_ioremap_resource(&pdev->dev, res); |
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if (IS_ERR(data->base)) |
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return PTR_ERR(data->base); |
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data->rcdev.owner = THIS_MODULE; |
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data->rcdev.nr_resets = 1; |
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data->rcdev.ops = &brcm_rescal_reset_ops; |
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data->rcdev.of_node = pdev->dev.of_node; |
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data->rcdev.of_xlate = brcm_rescal_reset_xlate; |
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data->dev = &pdev->dev; |
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return devm_reset_controller_register(&pdev->dev, &data->rcdev); |
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} |
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static const struct of_device_id brcm_rescal_reset_of_match[] = { |
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{ .compatible = "brcm,bcm7216-pcie-sata-rescal" }, |
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{ }, |
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}; |
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MODULE_DEVICE_TABLE(of, brcm_rescal_reset_of_match); |
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static struct platform_driver brcm_rescal_reset_driver = { |
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.probe = brcm_rescal_reset_probe, |
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.driver = { |
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.name = "brcm-rescal-reset", |
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.of_match_table = brcm_rescal_reset_of_match, |
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} |
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}; |
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module_platform_driver(brcm_rescal_reset_driver); |
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MODULE_AUTHOR("Broadcom"); |
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MODULE_DESCRIPTION("Broadcom SATA/PCIe rescal reset controller"); |
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MODULE_LICENSE("GPL v2");
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