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134 lines
3.5 KiB
134 lines
3.5 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Copyright (C) 2018 The Linux Foundation. All rights reserved. |
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*/ |
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#include <linux/module.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/io.h> |
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#include <linux/of_device.h> |
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#include <dt-bindings/reset/qcom,sdm845-aoss.h> |
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struct qcom_aoss_reset_map { |
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unsigned int reg; |
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}; |
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struct qcom_aoss_desc { |
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const struct qcom_aoss_reset_map *resets; |
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size_t num_resets; |
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}; |
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struct qcom_aoss_reset_data { |
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struct reset_controller_dev rcdev; |
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void __iomem *base; |
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const struct qcom_aoss_desc *desc; |
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}; |
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static const struct qcom_aoss_reset_map sdm845_aoss_resets[] = { |
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[AOSS_CC_MSS_RESTART] = {0x10000}, |
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[AOSS_CC_CAMSS_RESTART] = {0x11000}, |
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[AOSS_CC_VENUS_RESTART] = {0x12000}, |
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[AOSS_CC_GPU_RESTART] = {0x13000}, |
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[AOSS_CC_DISPSS_RESTART] = {0x14000}, |
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[AOSS_CC_WCSS_RESTART] = {0x20000}, |
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[AOSS_CC_LPASS_RESTART] = {0x30000}, |
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}; |
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static const struct qcom_aoss_desc sdm845_aoss_desc = { |
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.resets = sdm845_aoss_resets, |
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.num_resets = ARRAY_SIZE(sdm845_aoss_resets), |
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}; |
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static inline struct qcom_aoss_reset_data *to_qcom_aoss_reset_data( |
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struct reset_controller_dev *rcdev) |
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{ |
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return container_of(rcdev, struct qcom_aoss_reset_data, rcdev); |
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} |
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static int qcom_aoss_control_assert(struct reset_controller_dev *rcdev, |
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unsigned long idx) |
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{ |
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struct qcom_aoss_reset_data *data = to_qcom_aoss_reset_data(rcdev); |
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const struct qcom_aoss_reset_map *map = &data->desc->resets[idx]; |
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writel(1, data->base + map->reg); |
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/* Wait 6 32kHz sleep cycles for reset */ |
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usleep_range(200, 300); |
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return 0; |
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} |
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static int qcom_aoss_control_deassert(struct reset_controller_dev *rcdev, |
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unsigned long idx) |
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{ |
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struct qcom_aoss_reset_data *data = to_qcom_aoss_reset_data(rcdev); |
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const struct qcom_aoss_reset_map *map = &data->desc->resets[idx]; |
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writel(0, data->base + map->reg); |
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/* Wait 6 32kHz sleep cycles for reset */ |
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usleep_range(200, 300); |
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return 0; |
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} |
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static int qcom_aoss_control_reset(struct reset_controller_dev *rcdev, |
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unsigned long idx) |
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{ |
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qcom_aoss_control_assert(rcdev, idx); |
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return qcom_aoss_control_deassert(rcdev, idx); |
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} |
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static const struct reset_control_ops qcom_aoss_reset_ops = { |
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.reset = qcom_aoss_control_reset, |
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.assert = qcom_aoss_control_assert, |
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.deassert = qcom_aoss_control_deassert, |
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}; |
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static int qcom_aoss_reset_probe(struct platform_device *pdev) |
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{ |
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struct qcom_aoss_reset_data *data; |
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struct device *dev = &pdev->dev; |
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const struct qcom_aoss_desc *desc; |
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struct resource *res; |
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desc = of_device_get_match_data(dev); |
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if (!desc) |
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return -EINVAL; |
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data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL); |
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if (!data) |
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return -ENOMEM; |
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data->desc = desc; |
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
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data->base = devm_ioremap_resource(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.ops = &qcom_aoss_reset_ops; |
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data->rcdev.nr_resets = desc->num_resets; |
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data->rcdev.of_node = dev->of_node; |
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return devm_reset_controller_register(dev, &data->rcdev); |
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} |
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static const struct of_device_id qcom_aoss_reset_of_match[] = { |
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{ .compatible = "qcom,sdm845-aoss-cc", .data = &sdm845_aoss_desc }, |
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{} |
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}; |
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MODULE_DEVICE_TABLE(of, qcom_aoss_reset_of_match); |
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static struct platform_driver qcom_aoss_reset_driver = { |
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.probe = qcom_aoss_reset_probe, |
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.driver = { |
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.name = "qcom_aoss_reset", |
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.of_match_table = qcom_aoss_reset_of_match, |
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}, |
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}; |
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module_platform_driver(qcom_aoss_reset_driver); |
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MODULE_DESCRIPTION("Qualcomm AOSS Reset Driver"); |
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MODULE_LICENSE("GPL v2");
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