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