// SPDX-License-Identifier: GPL-2.0-or-later /* * Copyright (c) 2014 MundoReader S.L. * Author: Heiko Stuebner <heiko@sntech.de> */ #include <linux/slab.h> #include <linux/io.h> #include <linux/reset-controller.h> #include <linux/spinlock.h> #include "clk.h" struct rockchip_softrst { struct reset_controller_dev rcdev; void __iomem *reg_base; int num_regs; int num_per_reg; u8 flags; spinlock_t lock; }; static int rockchip_softrst_assert(struct reset_controller_dev *rcdev, unsigned long id) { struct rockchip_softrst *softrst = container_of(rcdev, struct rockchip_softrst, rcdev); int bank = id / softrst->num_per_reg; int offset = id % softrst->num_per_reg; if (softrst->flags & ROCKCHIP_SOFTRST_HIWORD_MASK) { writel(BIT(offset) | (BIT(offset) << 16), softrst->reg_base + (bank * 4)); } else { unsigned long flags; u32 reg; spin_lock_irqsave(&softrst->lock, flags); reg = readl(softrst->reg_base + (bank * 4)); writel(reg | BIT(offset), softrst->reg_base + (bank * 4)); spin_unlock_irqrestore(&softrst->lock, flags); } return 0; } static int rockchip_softrst_deassert(struct reset_controller_dev *rcdev, unsigned long id) { struct rockchip_softrst *softrst = container_of(rcdev, struct rockchip_softrst, rcdev); int bank = id / softrst->num_per_reg; int offset = id % softrst->num_per_reg; if (softrst->flags & ROCKCHIP_SOFTRST_HIWORD_MASK) { writel((BIT(offset) << 16), softrst->reg_base + (bank * 4)); } else { unsigned long flags; u32 reg; spin_lock_irqsave(&softrst->lock, flags); reg = readl(softrst->reg_base + (bank * 4)); writel(reg & ~BIT(offset), softrst->reg_base + (bank * 4)); spin_unlock_irqrestore(&softrst->lock, flags); } return 0; } static const struct reset_control_ops rockchip_softrst_ops = { .assert = rockchip_softrst_assert, .deassert = rockchip_softrst_deassert, }; void __init rockchip_register_softrst(struct device_node *np, unsigned int num_regs, void __iomem *base, u8 flags) { struct rockchip_softrst *softrst; int ret; softrst = kzalloc(sizeof(*softrst), GFP_KERNEL); if (!softrst) return; spin_lock_init(&softrst->lock); softrst->reg_base = base; softrst->flags = flags; softrst->num_regs = num_regs; softrst->num_per_reg = (flags & ROCKCHIP_SOFTRST_HIWORD_MASK) ? 16 : 32; softrst->rcdev.owner = THIS_MODULE; softrst->rcdev.nr_resets = num_regs * softrst->num_per_reg; softrst->rcdev.ops = &rockchip_softrst_ops; softrst->rcdev.of_node = np; ret = reset_controller_register(&softrst->rcdev); if (ret) { pr_err("%s: could not register reset controller, %d\n", __func__, ret); kfree(softrst); } };