1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * Copyright (c) 2014 MundoReader S.L.
4 * Author: Heiko Stuebner <heiko@sntech.de>
7 #include <linux/slab.h>
9 #include <linux/reset-controller.h>
10 #include <linux/spinlock.h>
13 struct rockchip_softrst {
14 struct reset_controller_dev rcdev;
16 void __iomem *reg_base;
23 static int rockchip_softrst_assert(struct reset_controller_dev *rcdev,
26 struct rockchip_softrst *softrst = container_of(rcdev,
27 struct rockchip_softrst,
32 id = softrst->lut[id];
34 bank = id / softrst->num_per_reg;
35 offset = id % softrst->num_per_reg;
37 if (softrst->flags & ROCKCHIP_SOFTRST_HIWORD_MASK) {
38 writel(BIT(offset) | (BIT(offset) << 16),
39 softrst->reg_base + (bank * 4));
44 spin_lock_irqsave(&softrst->lock, flags);
46 reg = readl(softrst->reg_base + (bank * 4));
47 writel(reg | BIT(offset), softrst->reg_base + (bank * 4));
49 spin_unlock_irqrestore(&softrst->lock, flags);
55 static int rockchip_softrst_deassert(struct reset_controller_dev *rcdev,
58 struct rockchip_softrst *softrst = container_of(rcdev,
59 struct rockchip_softrst,
64 id = softrst->lut[id];
66 bank = id / softrst->num_per_reg;
67 offset = id % softrst->num_per_reg;
69 if (softrst->flags & ROCKCHIP_SOFTRST_HIWORD_MASK) {
70 writel((BIT(offset) << 16), softrst->reg_base + (bank * 4));
75 spin_lock_irqsave(&softrst->lock, flags);
77 reg = readl(softrst->reg_base + (bank * 4));
78 writel(reg & ~BIT(offset), softrst->reg_base + (bank * 4));
80 spin_unlock_irqrestore(&softrst->lock, flags);
86 static const struct reset_control_ops rockchip_softrst_ops = {
87 .assert = rockchip_softrst_assert,
88 .deassert = rockchip_softrst_deassert,
91 void rockchip_register_softrst_lut(struct device_node *np,
92 const int *lookup_table,
93 unsigned int num_regs,
94 void __iomem *base, u8 flags)
96 struct rockchip_softrst *softrst;
99 softrst = kzalloc(sizeof(*softrst), GFP_KERNEL);
103 spin_lock_init(&softrst->lock);
105 softrst->reg_base = base;
106 softrst->lut = lookup_table;
107 softrst->flags = flags;
108 softrst->num_regs = num_regs;
109 softrst->num_per_reg = (flags & ROCKCHIP_SOFTRST_HIWORD_MASK) ? 16
112 softrst->rcdev.owner = THIS_MODULE;
114 softrst->rcdev.nr_resets = num_regs;
116 softrst->rcdev.nr_resets = num_regs * softrst->num_per_reg;
117 softrst->rcdev.ops = &rockchip_softrst_ops;
118 softrst->rcdev.of_node = np;
119 ret = reset_controller_register(&softrst->rcdev);
121 pr_err("%s: could not register reset controller, %d\n",
126 EXPORT_SYMBOL_GPL(rockchip_register_softrst_lut);