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123 lines
3.0 KiB
123 lines
3.0 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Copyright (C) STMicroelectronics 2022 - All Rights Reserved |
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* Author: Gabriel Fernandez <[email protected]> for STMicroelectronics. |
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*/ |
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#include <linux/of.h> |
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#include <linux/platform_device.h> |
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#include <linux/regmap.h> |
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#include <linux/reset-controller.h> |
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#include <linux/slab.h> |
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#include <linux/spinlock.h> |
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#include "clk-stm32-core.h" |
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#define STM32_RESET_ID_MASK GENMASK(15, 0) |
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struct stm32_reset_data { |
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/* reset lock */ |
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spinlock_t lock; |
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struct reset_controller_dev rcdev; |
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void __iomem *membase; |
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u32 clear_offset; |
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}; |
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static inline struct stm32_reset_data * |
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to_stm32_reset_data(struct reset_controller_dev *rcdev) |
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{ |
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return container_of(rcdev, struct stm32_reset_data, rcdev); |
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} |
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static int stm32_reset_update(struct reset_controller_dev *rcdev, |
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unsigned long id, bool assert) |
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{ |
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struct stm32_reset_data *data = to_stm32_reset_data(rcdev); |
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int reg_width = sizeof(u32); |
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int bank = id / (reg_width * BITS_PER_BYTE); |
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int offset = id % (reg_width * BITS_PER_BYTE); |
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if (data->clear_offset) { |
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void __iomem *addr; |
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addr = data->membase + (bank * reg_width); |
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if (!assert) |
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addr += data->clear_offset; |
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writel(BIT(offset), addr); |
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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(&data->lock, flags); |
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reg = readl(data->membase + (bank * reg_width)); |
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if (assert) |
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reg |= BIT(offset); |
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else |
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reg &= ~BIT(offset); |
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writel(reg, data->membase + (bank * reg_width)); |
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spin_unlock_irqrestore(&data->lock, flags); |
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} |
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return 0; |
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} |
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static int stm32_reset_assert(struct reset_controller_dev *rcdev, |
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unsigned long id) |
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{ |
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return stm32_reset_update(rcdev, id, true); |
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} |
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static int stm32_reset_deassert(struct reset_controller_dev *rcdev, |
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unsigned long id) |
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{ |
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return stm32_reset_update(rcdev, id, false); |
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} |
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static int stm32_reset_status(struct reset_controller_dev *rcdev, |
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unsigned long id) |
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{ |
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struct stm32_reset_data *data = to_stm32_reset_data(rcdev); |
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int reg_width = sizeof(u32); |
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int bank = id / (reg_width * BITS_PER_BYTE); |
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int offset = id % (reg_width * BITS_PER_BYTE); |
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u32 reg; |
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reg = readl(data->membase + (bank * reg_width)); |
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return !!(reg & BIT(offset)); |
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} |
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static const struct reset_control_ops stm32_reset_ops = { |
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.assert = stm32_reset_assert, |
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.deassert = stm32_reset_deassert, |
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.status = stm32_reset_status, |
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}; |
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int stm32_rcc_reset_init(struct device *dev, const struct of_device_id *match, |
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void __iomem *base) |
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{ |
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const struct stm32_rcc_match_data *data = match->data; |
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struct stm32_reset_data *reset_data = NULL; |
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data = match->data; |
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reset_data = kzalloc(sizeof(*reset_data), GFP_KERNEL); |
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if (!reset_data) |
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return -ENOMEM; |
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spin_lock_init(&reset_data->lock); |
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reset_data->membase = base; |
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reset_data->rcdev.owner = THIS_MODULE; |
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reset_data->rcdev.ops = &stm32_reset_ops; |
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reset_data->rcdev.of_node = dev_of_node(dev); |
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reset_data->rcdev.nr_resets = STM32_RESET_ID_MASK; |
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reset_data->clear_offset = data->clear_offset; |
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return reset_controller_register(&reset_data->rcdev); |
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}
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