1 // SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause 2 /* 3 * Amlogic Meson Reset Controller driver 4 * 5 * Copyright (c) 2016-2024 BayLibre, SAS. 6 * Authors: Neil Armstrong <narmstrong@baylibre.com> 7 * Jerome Brunet <jbrunet@baylibre.com> 8 */ 9 10 #include <linux/err.h> 11 #include <linux/io.h> 12 #include <linux/of.h> 13 #include <linux/module.h> 14 #include <linux/platform_device.h> 15 #include <linux/regmap.h> 16 #include <linux/reset-controller.h> 17 18 #include "reset-meson.h" 19 20 static const struct meson_reset_param meson8b_param = { 21 .reset_num = 256, 22 .reset_offset = 0x0, 23 .level_offset = 0x7c, 24 .level_low_reset = true, 25 }; 26 27 static const struct meson_reset_param meson_a1_param = { 28 .reset_num = 96, 29 .reset_offset = 0x0, 30 .level_offset = 0x40, 31 .level_low_reset = true, 32 }; 33 34 static const struct meson_reset_param meson_s4_param = { 35 .reset_num = 192, 36 .reset_offset = 0x0, 37 .level_offset = 0x40, 38 .level_low_reset = true, 39 }; 40 41 static const struct meson_reset_param t7_param = { 42 .reset_num = 224, 43 .reset_offset = 0x0, 44 .level_offset = 0x40, 45 .level_low_reset = true, 46 }; 47 48 static const struct of_device_id meson_reset_dt_ids[] = { 49 { .compatible = "amlogic,meson8b-reset", .data = &meson8b_param}, 50 { .compatible = "amlogic,meson-gxbb-reset", .data = &meson8b_param}, 51 { .compatible = "amlogic,meson-axg-reset", .data = &meson8b_param}, 52 { .compatible = "amlogic,meson-a1-reset", .data = &meson_a1_param}, 53 { .compatible = "amlogic,meson-s4-reset", .data = &meson_s4_param}, 54 { .compatible = "amlogic,c3-reset", .data = &meson_s4_param}, 55 { .compatible = "amlogic,t7-reset", .data = &t7_param}, 56 { /* sentinel */ }, 57 }; 58 MODULE_DEVICE_TABLE(of, meson_reset_dt_ids); 59 60 static const struct regmap_config regmap_config = { 61 .reg_bits = 32, 62 .val_bits = 32, 63 .reg_stride = 4, 64 }; 65 66 static int meson_reset_probe(struct platform_device *pdev) 67 { 68 const struct meson_reset_param *param; 69 struct device *dev = &pdev->dev; 70 struct regmap *map; 71 void __iomem *base; 72 73 base = devm_platform_ioremap_resource(pdev, 0); 74 if (IS_ERR(base)) 75 return PTR_ERR(base); 76 77 param = device_get_match_data(dev); 78 if (!param) 79 return -ENODEV; 80 81 map = devm_regmap_init_mmio(dev, base, ®map_config); 82 if (IS_ERR(map)) 83 return dev_err_probe(dev, PTR_ERR(map), 84 "can't init regmap mmio region\n"); 85 86 return meson_reset_controller_register(dev, map, param); 87 } 88 89 static struct platform_driver meson_reset_driver = { 90 .probe = meson_reset_probe, 91 .driver = { 92 .name = "meson_reset", 93 .of_match_table = meson_reset_dt_ids, 94 }, 95 }; 96 module_platform_driver(meson_reset_driver); 97 98 MODULE_DESCRIPTION("Amlogic Meson Reset Controller driver"); 99 MODULE_AUTHOR("Neil Armstrong <narmstrong@baylibre.com>"); 100 MODULE_AUTHOR("Jerome Brunet <jbrunet@baylibre.com>"); 101 MODULE_LICENSE("Dual BSD/GPL"); 102 MODULE_IMPORT_NS(MESON_RESET); 103