projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 85fa0c7f HS |
1 | /* |
| 2 | * Copyright (c) 2014 MundoReader S.L. | |
| 3 | * Author: Heiko Stuebner <heiko@sntech.de> | |
| 4 | * | |
| 5 | * This program is free software; you can redistribute it and/or modify | |
| 6 | * it under the terms of the GNU General Public License as published by | |
| 7 | * the Free Software Foundation; either version 2 of the License, or | |
| 8 | * (at your option) any later version. | |
| 9 | * | |
| 10 | * This program is distributed in the hope that it will be useful, | |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 13 | * GNU General Public License for more details. | |
| 14 | */ | |
| 15 | ||
| 16 | #include <linux/slab.h> | |
| 17 | #include <linux/io.h> | |
| 18 | #include <linux/reset-controller.h> | |
| 19 | #include <linux/spinlock.h> | |
| 20 | #include "clk.h" | |
| 21 | ||
| 22 | struct rockchip_softrst { | |
| 23 | struct reset_controller_dev rcdev; | |
| 24 | void __iomem *reg_base; | |
| 25 | int num_regs; | |
| 26 | int num_per_reg; | |
| 27 | u8 flags; | |
| 28 | spinlock_t lock; | |
| 29 | }; | |
| 30 | ||
| 31 | static int rockchip_softrst_assert(struct reset_controller_dev *rcdev, | |
| 32 | unsigned long id) | |
| 33 | { | |
| 34 | struct rockchip_softrst *softrst = container_of(rcdev, | |
| 35 | struct rockchip_softrst, | |
| 36 | rcdev); | |
| 37 | int bank = id / softrst->num_per_reg; | |
| 38 | int offset = id % softrst->num_per_reg; | |
| 39 | ||
| 40 | if (softrst->flags & ROCKCHIP_SOFTRST_HIWORD_MASK) { | |
| 41 | writel(BIT(offset) | (BIT(offset) << 16), | |
| 42 | softrst->reg_base + (bank * 4)); | |
| 43 | } else { | |
| 44 | unsigned long flags; | |
| 45 | u32 reg; | |
| 46 | ||
| 47 | spin_lock_irqsave(&softrst->lock, flags); | |
| 48 | ||
| 49 | reg = readl(softrst->reg_base + (bank * 4)); | |
| 50 | writel(reg | BIT(offset), softrst->reg_base + (bank * 4)); | |
| 51 | ||
| 52 | spin_unlock_irqrestore(&softrst->lock, flags); | |
| 53 | } | |
| 54 | ||
| 55 | return 0; | |
| 56 | } | |
| 57 | ||
| 58 | static int rockchip_softrst_deassert(struct reset_controller_dev *rcdev, | |
| 59 | unsigned long id) | |
| 60 | { | |
| 61 | struct rockchip_softrst *softrst = container_of(rcdev, | |
| 62 | struct rockchip_softrst, | |
| 63 | rcdev); | |
| 64 | int bank = id / softrst->num_per_reg; | |
| 65 | int offset = id % softrst->num_per_reg; | |
| 66 | ||
| 67 | if (softrst->flags & ROCKCHIP_SOFTRST_HIWORD_MASK) { | |
| 68 | writel((BIT(offset) << 16), softrst->reg_base + (bank * 4)); | |
| 69 | } else { | |
| 70 | unsigned long flags; | |
| 71 | u32 reg; | |
| 72 | ||
| 73 | spin_lock_irqsave(&softrst->lock, flags); | |
| 74 | ||
| 75 | reg = readl(softrst->reg_base + (bank * 4)); | |
| 76 | writel(reg & ~BIT(offset), softrst->reg_base + (bank * 4)); | |
| 77 | ||
| 78 | spin_unlock_irqrestore(&softrst->lock, flags); | |
| 79 | } | |
| 80 | ||
| 81 | return 0; | |
| 82 | } | |
| 83 | ||
| 3fb950fe | 84 | static const struct reset_control_ops rockchip_softrst_ops = { |
| 85fa0c7f HS |
85 | .assert = rockchip_softrst_assert, |
| 86 | .deassert = rockchip_softrst_deassert, | |
| 87 | }; | |
| 88 | ||
| 89 | void __init rockchip_register_softrst(struct device_node *np, | |
| 90 | unsigned int num_regs, | |
| 91 | void __iomem *base, u8 flags) | |
| 92 | { | |
| 93 | struct rockchip_softrst *softrst; | |
| 94 | int ret; | |
| 95 | ||
| 96 | softrst = kzalloc(sizeof(*softrst), GFP_KERNEL); | |
| 97 | if (!softrst) | |
| 98 | return; | |
| 99 | ||
| 100 | spin_lock_init(&softrst->lock); | |
| 101 | ||
| 102 | softrst->reg_base = base; | |
| 103 | softrst->flags = flags; | |
| 104 | softrst->num_regs = num_regs; | |
| 105 | softrst->num_per_reg = (flags & ROCKCHIP_SOFTRST_HIWORD_MASK) ? 16 | |
| 106 | : 32; | |
| 107 | ||
| 108 | softrst->rcdev.owner = THIS_MODULE; | |
| 109 | softrst->rcdev.nr_resets = num_regs * softrst->num_per_reg; | |
| 110 | softrst->rcdev.ops = &rockchip_softrst_ops; | |
| 111 | softrst->rcdev.of_node = np; | |
| 112 | ret = reset_controller_register(&softrst->rcdev); | |
| 113 | if (ret) { | |
| 114 | pr_err("%s: could not register reset controller, %d\n", | |
| 115 | __func__, ret); | |
| 116 | kfree(softrst); | |
| 117 | } | |
| 118 | }; |