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"); 125