projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| eea2926b SS |
1 | // SPDX-License-Identifier: GPL-2.0 |
| 2 | /* | |
| 3 | * Copyright (C) 2018 The Linux Foundation. All rights reserved. | |
| 4 | */ | |
| 5 | ||
| 6 | #include <linux/module.h> | |
| 7 | #include <linux/of_device.h> | |
| 8 | #include <linux/platform_device.h> | |
| 9 | #include <linux/regmap.h> | |
| 10 | #include <linux/reset-controller.h> | |
| 11 | ||
| 12 | #include <dt-bindings/reset/qcom,sdm845-pdc.h> | |
| 13 | ||
| 14 | #define RPMH_PDC_SYNC_RESET 0x100 | |
| 15 | ||
| 16 | struct qcom_pdc_reset_map { | |
| 17 | u8 bit; | |
| 18 | }; | |
| 19 | ||
| 20 | struct qcom_pdc_reset_data { | |
| 21 | struct reset_controller_dev rcdev; | |
| 22 | struct regmap *regmap; | |
| 23 | }; | |
| 24 | ||
| 25 | static const struct regmap_config sdm845_pdc_regmap_config = { | |
| 26 | .name = "pdc-reset", | |
| 27 | .reg_bits = 32, | |
| 28 | .reg_stride = 4, | |
| 29 | .val_bits = 32, | |
| 30 | .max_register = 0x20000, | |
| 31 | .fast_io = true, | |
| 32 | }; | |
| 33 | ||
| 34 | static const struct qcom_pdc_reset_map sdm845_pdc_resets[] = { | |
| 35 | [PDC_APPS_SYNC_RESET] = {0}, | |
| 36 | [PDC_SP_SYNC_RESET] = {1}, | |
| 37 | [PDC_AUDIO_SYNC_RESET] = {2}, | |
| 38 | [PDC_SENSORS_SYNC_RESET] = {3}, | |
| 39 | [PDC_AOP_SYNC_RESET] = {4}, | |
| 40 | [PDC_DEBUG_SYNC_RESET] = {5}, | |
| 41 | [PDC_GPU_SYNC_RESET] = {6}, | |
| 42 | [PDC_DISPLAY_SYNC_RESET] = {7}, | |
| 43 | [PDC_COMPUTE_SYNC_RESET] = {8}, | |
| 44 | [PDC_MODEM_SYNC_RESET] = {9}, | |
| 45 | }; | |
| 46 | ||
| 47 | static inline struct qcom_pdc_reset_data *to_qcom_pdc_reset_data( | |
| 48 | struct reset_controller_dev *rcdev) | |
| 49 | { | |
| 50 | return container_of(rcdev, struct qcom_pdc_reset_data, rcdev); | |
| 51 | } | |
| 52 | ||
| 53 | static int qcom_pdc_control_assert(struct reset_controller_dev *rcdev, | |
| 54 | unsigned long idx) | |
| 55 | { | |
| 56 | struct qcom_pdc_reset_data *data = to_qcom_pdc_reset_data(rcdev); | |
| 57 | ||
| 58 | return regmap_update_bits(data->regmap, RPMH_PDC_SYNC_RESET, | |
| 59 | BIT(sdm845_pdc_resets[idx].bit), | |
| 60 | BIT(sdm845_pdc_resets[idx].bit)); | |
| 61 | } | |
| 62 | ||
| 63 | static int qcom_pdc_control_deassert(struct reset_controller_dev *rcdev, | |
| 64 | unsigned long idx) | |
| 65 | { | |
| 66 | struct qcom_pdc_reset_data *data = to_qcom_pdc_reset_data(rcdev); | |
| 67 | ||
| 68 | return regmap_update_bits(data->regmap, RPMH_PDC_SYNC_RESET, | |
| 69 | BIT(sdm845_pdc_resets[idx].bit), 0); | |
| 70 | } | |
| 71 | ||
| 72 | static const struct reset_control_ops qcom_pdc_reset_ops = { | |
| 73 | .assert = qcom_pdc_control_assert, | |
| 74 | .deassert = qcom_pdc_control_deassert, | |
| 75 | }; | |
| 76 | ||
| 77 | static int qcom_pdc_reset_probe(struct platform_device *pdev) | |
| 78 | { | |
| 79 | struct qcom_pdc_reset_data *data; | |
| 80 | struct device *dev = &pdev->dev; | |
| 81 | void __iomem *base; | |
| 82 | struct resource *res; | |
| 83 | ||
| 84 | data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL); | |
| 85 | if (!data) | |
| 86 | return -ENOMEM; | |
| 87 | ||
| 88 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
| 89 | base = devm_ioremap_resource(dev, res); | |
| 90 | if (IS_ERR(base)) | |
| 91 | return PTR_ERR(base); | |
| 92 | ||
| 93 | data->regmap = devm_regmap_init_mmio(dev, base, | |
| 94 | &sdm845_pdc_regmap_config); | |
| 95 | if (IS_ERR(data->regmap)) { | |
| 96 | dev_err(dev, "Unable to initialize regmap\n"); | |
| 97 | return PTR_ERR(data->regmap); | |
| 98 | } | |
| 99 | ||
| 100 | data->rcdev.owner = THIS_MODULE; | |
| 101 | data->rcdev.ops = &qcom_pdc_reset_ops; | |
| 102 | data->rcdev.nr_resets = ARRAY_SIZE(sdm845_pdc_resets); | |
| 103 | data->rcdev.of_node = dev->of_node; | |
| 104 | ||
| 105 | return devm_reset_controller_register(dev, &data->rcdev); | |
| 106 | } | |
| 107 | ||
| 108 | static const struct of_device_id qcom_pdc_reset_of_match[] = { | |
| 109 | { .compatible = "qcom,sdm845-pdc-global" }, | |
| 110 | {} | |
| 111 | }; | |
| 112 | MODULE_DEVICE_TABLE(of, qcom_pdc_reset_of_match); | |
| 113 | ||
| 114 | static struct platform_driver qcom_pdc_reset_driver = { | |
| 115 | .probe = qcom_pdc_reset_probe, | |
| 116 | .driver = { | |
| 117 | .name = "qcom_pdc_reset", | |
| 118 | .of_match_table = qcom_pdc_reset_of_match, | |
| 119 | }, | |
| 120 | }; | |
| 121 | module_platform_driver(qcom_pdc_reset_driver); | |
| 122 | ||
| 123 | MODULE_DESCRIPTION("Qualcomm PDC Reset Driver"); | |
| 124 | MODULE_LICENSE("GPL v2"); |