forked from mirrors/linux
eea2926b0a
Add reset controller for SDM845 SoCs to control reset signals provided by PDC Global for Modem, Compute, Display, GPU, Debug, AOP, Sensors, Audio, SP and APPS Signed-off-by: Sibi Sankar <sibis@codeaurora.org> Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org> Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
124 lines
3.2 KiB
C
124 lines
3.2 KiB
C
// 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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