1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Reset driver for the StarFive JH7110 SoC 4 * 5 * Copyright (C) 2022 StarFive Technology Co., Ltd. 6 */ 7 8 #include <linux/auxiliary_bus.h> 9 10 #include "reset-starfive-jh71x0.h" 11 12 #include <dt-bindings/reset/starfive,jh7110-crg.h> 13 14 struct jh7110_reset_info { 15 unsigned int nr_resets; 16 unsigned int assert_offset; 17 unsigned int status_offset; 18 }; 19 20 static const struct jh7110_reset_info jh7110_sys_info = { 21 .nr_resets = JH7110_SYSRST_END, 22 .assert_offset = 0x2F8, 23 .status_offset = 0x308, 24 }; 25 26 static const struct jh7110_reset_info jh7110_aon_info = { 27 .nr_resets = JH7110_AONRST_END, 28 .assert_offset = 0x38, 29 .status_offset = 0x3C, 30 }; 31 32 static int jh7110_reset_probe(struct auxiliary_device *adev, 33 const struct auxiliary_device_id *id) 34 { 35 struct jh7110_reset_info *info = (struct jh7110_reset_info *)(id->driver_data); 36 void __iomem **base = (void __iomem **)dev_get_drvdata(adev->dev.parent); 37 38 if (!info || !base) 39 return -ENODEV; 40 41 return reset_starfive_jh71x0_register(&adev->dev, adev->dev.parent->of_node, 42 *base + info->assert_offset, 43 *base + info->status_offset, 44 NULL, 45 info->nr_resets, 46 NULL); 47 } 48 49 static const struct auxiliary_device_id jh7110_reset_ids[] = { 50 { 51 .name = "clk_starfive_jh7110_sys.rst-sys", 52 .driver_data = (kernel_ulong_t)&jh7110_sys_info, 53 }, 54 { 55 .name = "clk_starfive_jh7110_sys.rst-aon", 56 .driver_data = (kernel_ulong_t)&jh7110_aon_info, 57 }, 58 { /* sentinel */ } 59 }; 60 MODULE_DEVICE_TABLE(auxiliary, jh7110_reset_ids); 61 62 static struct auxiliary_driver jh7110_reset_driver = { 63 .probe = jh7110_reset_probe, 64 .id_table = jh7110_reset_ids, 65 }; 66 module_auxiliary_driver(jh7110_reset_driver); 67 68 MODULE_AUTHOR("Hal Feng <hal.feng@starfivetech.com>"); 69 MODULE_DESCRIPTION("StarFive JH7110 reset driver"); 70 MODULE_LICENSE("GPL"); 71