1 // SPDX-License-Identifier: GPL-2.0+
3 * Copyright (C) 2017, STMicroelectronics - All Rights Reserved
4 * Author(s): Patrice Chotard, <patrice.chotard@st.com> for STMicroelectronics.
11 #include <reset-uclass.h>
12 #include <stm32_rcc.h>
15 /* reset clear offset for STM32MP RCC */
18 struct stm32_reset_priv {
22 static int stm32_reset_request(struct reset_ctl *reset_ctl)
27 static int stm32_reset_free(struct reset_ctl *reset_ctl)
32 static int stm32_reset_assert(struct reset_ctl *reset_ctl)
34 struct stm32_reset_priv *priv = dev_get_priv(reset_ctl->dev);
35 int bank = (reset_ctl->id / BITS_PER_LONG) * 4;
36 int offset = reset_ctl->id % BITS_PER_LONG;
37 debug("%s: reset id = %ld bank = %d offset = %d)\n", __func__,
38 reset_ctl->id, bank, offset);
40 if (dev_get_driver_data(reset_ctl->dev) == STM32MP1)
41 /* reset assert is done in rcc set register */
42 writel(BIT(offset), priv->base + bank);
44 setbits_le32(priv->base + bank, BIT(offset));
49 static int stm32_reset_deassert(struct reset_ctl *reset_ctl)
51 struct stm32_reset_priv *priv = dev_get_priv(reset_ctl->dev);
52 int bank = (reset_ctl->id / BITS_PER_LONG) * 4;
53 int offset = reset_ctl->id % BITS_PER_LONG;
54 debug("%s: reset id = %ld bank = %d offset = %d)\n", __func__,
55 reset_ctl->id, bank, offset);
57 if (dev_get_driver_data(reset_ctl->dev) == STM32MP1)
58 /* reset deassert is done in rcc clr register */
59 writel(BIT(offset), priv->base + bank + RCC_CL);
61 clrbits_le32(priv->base + bank, BIT(offset));
66 static const struct reset_ops stm32_reset_ops = {
67 .request = stm32_reset_request,
68 .rfree = stm32_reset_free,
69 .rst_assert = stm32_reset_assert,
70 .rst_deassert = stm32_reset_deassert,
73 static int stm32_reset_probe(struct udevice *dev)
75 struct stm32_reset_priv *priv = dev_get_priv(dev);
77 priv->base = dev_read_addr(dev);
78 if (priv->base == FDT_ADDR_T_NONE) {
79 /* for MFD, get address of parent */
80 priv->base = dev_read_addr(dev->parent);
81 if (priv->base == FDT_ADDR_T_NONE)
88 U_BOOT_DRIVER(stm32_rcc_reset) = {
89 .name = "stm32_rcc_reset",
91 .probe = stm32_reset_probe,
92 .priv_auto_alloc_size = sizeof(struct stm32_reset_priv),
93 .ops = &stm32_reset_ops,