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93 lines
2.3 KiB
93 lines
2.3 KiB
// SPDX-License-Identifier: GPL-2.0+ |
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/* |
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* Copyright (C) 2017, STMicroelectronics - All Rights Reserved |
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* Author(s): Patrice Chotard, <[email protected]> for STMicroelectronics. |
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*/ |
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#include <common.h> |
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#include <dm.h> |
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#include <errno.h> |
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#include <reset-uclass.h> |
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#include <stm32_rcc.h> |
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#include <asm/io.h> |
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/* reset clear offset for STM32MP RCC */ |
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#define RCC_CL 0x4 |
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struct stm32_reset_priv { |
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fdt_addr_t base; |
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}; |
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static int stm32_reset_request(struct reset_ctl *reset_ctl) |
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{ |
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return 0; |
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} |
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static int stm32_reset_free(struct reset_ctl *reset_ctl) |
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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_ctl *reset_ctl) |
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{ |
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struct stm32_reset_priv *priv = dev_get_priv(reset_ctl->dev); |
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int bank = (reset_ctl->id / BITS_PER_LONG) * 4; |
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int offset = reset_ctl->id % BITS_PER_LONG; |
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debug("%s: reset id = %ld bank = %d offset = %d)\n", __func__, |
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reset_ctl->id, bank, offset); |
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if (dev_get_driver_data(reset_ctl->dev) == STM32MP1) |
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/* reset assert is done in rcc set register */ |
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writel(BIT(offset), priv->base + bank); |
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else |
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setbits_le32(priv->base + bank, BIT(offset)); |
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return 0; |
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} |
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static int stm32_reset_deassert(struct reset_ctl *reset_ctl) |
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{ |
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struct stm32_reset_priv *priv = dev_get_priv(reset_ctl->dev); |
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int bank = (reset_ctl->id / BITS_PER_LONG) * 4; |
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int offset = reset_ctl->id % BITS_PER_LONG; |
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debug("%s: reset id = %ld bank = %d offset = %d)\n", __func__, |
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reset_ctl->id, bank, offset); |
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if (dev_get_driver_data(reset_ctl->dev) == STM32MP1) |
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/* reset deassert is done in rcc clr register */ |
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writel(BIT(offset), priv->base + bank + RCC_CL); |
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else |
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clrbits_le32(priv->base + bank, BIT(offset)); |
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return 0; |
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} |
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static const struct reset_ops stm32_reset_ops = { |
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.request = stm32_reset_request, |
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.free = stm32_reset_free, |
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.rst_assert = stm32_reset_assert, |
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.rst_deassert = stm32_reset_deassert, |
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}; |
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static int stm32_reset_probe(struct udevice *dev) |
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{ |
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struct stm32_reset_priv *priv = dev_get_priv(dev); |
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priv->base = dev_read_addr(dev); |
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if (priv->base == FDT_ADDR_T_NONE) { |
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/* for MFD, get address of parent */ |
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priv->base = dev_read_addr(dev->parent); |
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if (priv->base == FDT_ADDR_T_NONE) |
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return -EINVAL; |
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} |
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return 0; |
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} |
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U_BOOT_DRIVER(stm32_rcc_reset) = { |
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.name = "stm32_rcc_reset", |
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.id = UCLASS_RESET, |
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.probe = stm32_reset_probe, |
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.priv_auto_alloc_size = sizeof(struct stm32_reset_priv), |
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.ops = &stm32_reset_ops, |
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};
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