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Following next kernel rcc bindings, we must use a MFD RCC driver which is able to bind both clock and reset drivers. We can reuse and adapt RCC MFD driver already available for MCU SoCs (F4/F7/H7). Signed-off-by: Patrice Chotard <patrice.chotard@st.com> Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>
94 lines
2.3 KiB
C
94 lines
2.3 KiB
C
// 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, <patrice.chotard@st.com> 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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