1 /* 2 * Copyright (C) 2016 NVIDIA Corporation 3 * 4 * This program is free software; you can redistribute it and/or modify 5 * it under the terms of the GNU General Public License version 2 as 6 * published by the Free Software Foundation. 7 */ 8 9 #include <linux/reset-controller.h> 10 11 #include <soc/tegra/bpmp.h> 12 #include <soc/tegra/bpmp-abi.h> 13 14 static struct tegra_bpmp *to_tegra_bpmp(struct reset_controller_dev *rstc) 15 { 16 return container_of(rstc, struct tegra_bpmp, rstc); 17 } 18 19 static int tegra_bpmp_reset_common(struct reset_controller_dev *rstc, 20 enum mrq_reset_commands command, 21 unsigned int id) 22 { 23 struct tegra_bpmp *bpmp = to_tegra_bpmp(rstc); 24 struct mrq_reset_request request; 25 struct tegra_bpmp_message msg; 26 27 memset(&request, 0, sizeof(request)); 28 request.cmd = command; 29 request.reset_id = id; 30 31 memset(&msg, 0, sizeof(msg)); 32 msg.mrq = MRQ_RESET; 33 msg.tx.data = &request; 34 msg.tx.size = sizeof(request); 35 36 return tegra_bpmp_transfer(bpmp, &msg); 37 } 38 39 static int tegra_bpmp_reset_module(struct reset_controller_dev *rstc, 40 unsigned long id) 41 { 42 return tegra_bpmp_reset_common(rstc, CMD_RESET_MODULE, id); 43 } 44 45 static int tegra_bpmp_reset_assert(struct reset_controller_dev *rstc, 46 unsigned long id) 47 { 48 return tegra_bpmp_reset_common(rstc, CMD_RESET_ASSERT, id); 49 } 50 51 static int tegra_bpmp_reset_deassert(struct reset_controller_dev *rstc, 52 unsigned long id) 53 { 54 return tegra_bpmp_reset_common(rstc, CMD_RESET_DEASSERT, id); 55 } 56 57 static const struct reset_control_ops tegra_bpmp_reset_ops = { 58 .reset = tegra_bpmp_reset_module, 59 .assert = tegra_bpmp_reset_assert, 60 .deassert = tegra_bpmp_reset_deassert, 61 }; 62 63 int tegra_bpmp_init_resets(struct tegra_bpmp *bpmp) 64 { 65 bpmp->rstc.ops = &tegra_bpmp_reset_ops; 66 bpmp->rstc.owner = THIS_MODULE; 67 bpmp->rstc.of_node = bpmp->dev->of_node; 68 bpmp->rstc.nr_resets = bpmp->soc->num_resets; 69 70 return devm_reset_controller_register(bpmp->dev, &bpmp->rstc); 71 } 72