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124 lines
3.2 KiB
124 lines
3.2 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/of_device.h> |
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#include <linux/platform_device.h> |
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#include <linux/regmap.h> |
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#include <linux/reset-controller.h> |
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#include <dt-bindings/reset/qcom,sdm845-pdc.h> |
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#define RPMH_PDC_SYNC_RESET 0x100 |
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struct qcom_pdc_reset_map { |
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u8 bit; |
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}; |
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struct qcom_pdc_reset_data { |
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struct reset_controller_dev rcdev; |
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struct regmap *regmap; |
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}; |
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static const struct regmap_config sdm845_pdc_regmap_config = { |
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.name = "pdc-reset", |
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.reg_bits = 32, |
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.reg_stride = 4, |
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.val_bits = 32, |
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.max_register = 0x20000, |
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.fast_io = true, |
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}; |
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static const struct qcom_pdc_reset_map sdm845_pdc_resets[] = { |
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[PDC_APPS_SYNC_RESET] = {0}, |
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[PDC_SP_SYNC_RESET] = {1}, |
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[PDC_AUDIO_SYNC_RESET] = {2}, |
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[PDC_SENSORS_SYNC_RESET] = {3}, |
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[PDC_AOP_SYNC_RESET] = {4}, |
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[PDC_DEBUG_SYNC_RESET] = {5}, |
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[PDC_GPU_SYNC_RESET] = {6}, |
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[PDC_DISPLAY_SYNC_RESET] = {7}, |
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[PDC_COMPUTE_SYNC_RESET] = {8}, |
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[PDC_MODEM_SYNC_RESET] = {9}, |
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}; |
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static inline struct qcom_pdc_reset_data *to_qcom_pdc_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_pdc_reset_data, rcdev); |
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} |
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static int qcom_pdc_control_assert(struct reset_controller_dev *rcdev, |
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unsigned long idx) |
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{ |
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struct qcom_pdc_reset_data *data = to_qcom_pdc_reset_data(rcdev); |
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return regmap_update_bits(data->regmap, RPMH_PDC_SYNC_RESET, |
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BIT(sdm845_pdc_resets[idx].bit), |
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BIT(sdm845_pdc_resets[idx].bit)); |
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} |
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static int qcom_pdc_control_deassert(struct reset_controller_dev *rcdev, |
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unsigned long idx) |
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{ |
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struct qcom_pdc_reset_data *data = to_qcom_pdc_reset_data(rcdev); |
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return regmap_update_bits(data->regmap, RPMH_PDC_SYNC_RESET, |
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BIT(sdm845_pdc_resets[idx].bit), 0); |
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} |
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static const struct reset_control_ops qcom_pdc_reset_ops = { |
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.assert = qcom_pdc_control_assert, |
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.deassert = qcom_pdc_control_deassert, |
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}; |
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static int qcom_pdc_reset_probe(struct platform_device *pdev) |
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{ |
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struct qcom_pdc_reset_data *data; |
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struct device *dev = &pdev->dev; |
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void __iomem *base; |
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struct resource *res; |
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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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res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
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base = devm_ioremap_resource(dev, res); |
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if (IS_ERR(base)) |
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return PTR_ERR(base); |
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data->regmap = devm_regmap_init_mmio(dev, base, |
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&sdm845_pdc_regmap_config); |
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if (IS_ERR(data->regmap)) { |
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dev_err(dev, "Unable to initialize regmap\n"); |
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return PTR_ERR(data->regmap); |
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} |
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data->rcdev.owner = THIS_MODULE; |
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data->rcdev.ops = &qcom_pdc_reset_ops; |
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data->rcdev.nr_resets = ARRAY_SIZE(sdm845_pdc_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_pdc_reset_of_match[] = { |
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{ .compatible = "qcom,sdm845-pdc-global" }, |
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{} |
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}; |
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MODULE_DEVICE_TABLE(of, qcom_pdc_reset_of_match); |
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static struct platform_driver qcom_pdc_reset_driver = { |
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.probe = qcom_pdc_reset_probe, |
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.driver = { |
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.name = "qcom_pdc_reset", |
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.of_match_table = qcom_pdc_reset_of_match, |
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}, |
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}; |
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module_platform_driver(qcom_pdc_reset_driver); |
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MODULE_DESCRIPTION("Qualcomm PDC Reset Driver"); |
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MODULE_LICENSE("GPL v2");
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