1 /* 2 * Copyright (C) 2016 Maxime Ripard 3 * Maxime Ripard <maxime.ripard@free-electrons.com> 4 * 5 * This program is free software; you can redistribute it and/or 6 * modify it under the terms of the GNU General Public License as 7 * published by the Free Software Foundation; either version 2 of 8 * the License, or (at your option) any later version. 9 */ 10 11 #include <linux/io.h> 12 #include <linux/reset-controller.h> 13 14 #include "ccu_reset.h" 15 16 static int ccu_reset_assert(struct reset_controller_dev *rcdev, 17 unsigned long id) 18 { 19 struct ccu_reset *ccu = rcdev_to_ccu_reset(rcdev); 20 const struct ccu_reset_map *map = &ccu->reset_map[id]; 21 unsigned long flags; 22 u32 reg; 23 24 spin_lock_irqsave(ccu->lock, flags); 25 26 reg = readl(ccu->base + map->reg); 27 writel(reg & ~map->bit, ccu->base + map->reg); 28 29 spin_unlock_irqrestore(ccu->lock, flags); 30 31 return 0; 32 } 33 34 static int ccu_reset_deassert(struct reset_controller_dev *rcdev, 35 unsigned long id) 36 { 37 struct ccu_reset *ccu = rcdev_to_ccu_reset(rcdev); 38 const struct ccu_reset_map *map = &ccu->reset_map[id]; 39 unsigned long flags; 40 u32 reg; 41 42 spin_lock_irqsave(ccu->lock, flags); 43 44 reg = readl(ccu->base + map->reg); 45 writel(reg | map->bit, ccu->base + map->reg); 46 47 spin_unlock_irqrestore(ccu->lock, flags); 48 49 return 0; 50 } 51 52 const struct reset_control_ops ccu_reset_ops = { 53 .assert = ccu_reset_assert, 54 .deassert = ccu_reset_deassert, 55 }; 56