2 * Copyright (C) 2017, STMicroelectronics - All Rights Reserved
3 * Author(s): Patrice Chotard, <patrice.chotard@st.com> for STMicroelectronics.
5 * SPDX-License-Identifier: GPL-2.0+
11 #include <reset-uclass.h>
14 /* reset clear offset for STM32MP RCC */
22 struct stm32_reset_priv {
26 static int stm32_reset_request(struct reset_ctl *reset_ctl)
31 static int stm32_reset_free(struct reset_ctl *reset_ctl)
36 static int stm32_reset_assert(struct reset_ctl *reset_ctl)
38 struct stm32_reset_priv *priv = dev_get_priv(reset_ctl->dev);
39 int bank = (reset_ctl->id / BITS_PER_LONG) * 4;
40 int offset = reset_ctl->id % BITS_PER_LONG;
41 debug("%s: reset id = %ld bank = %d offset = %d)\n", __func__,
42 reset_ctl->id, bank, offset);
44 if (dev_get_driver_data(reset_ctl->dev) == RCC_STM32MP)
45 /* reset assert is done in rcc set register */
46 writel(BIT(offset), priv->base + bank);
48 setbits_le32(priv->base + bank, BIT(offset));
53 static int stm32_reset_deassert(struct reset_ctl *reset_ctl)
55 struct stm32_reset_priv *priv = dev_get_priv(reset_ctl->dev);
56 int bank = (reset_ctl->id / BITS_PER_LONG) * 4;
57 int offset = reset_ctl->id % BITS_PER_LONG;
58 debug("%s: reset id = %ld bank = %d offset = %d)\n", __func__,
59 reset_ctl->id, bank, offset);
61 if (dev_get_driver_data(reset_ctl->dev) == RCC_STM32MP)
62 /* reset deassert is done in rcc clr register */
63 writel(BIT(offset), priv->base + bank + RCC_CL);
65 clrbits_le32(priv->base + bank, BIT(offset));
70 static const struct reset_ops stm32_reset_ops = {
71 .request = stm32_reset_request,
72 .free = stm32_reset_free,
73 .rst_assert = stm32_reset_assert,
74 .rst_deassert = stm32_reset_deassert,
77 static int stm32_reset_probe(struct udevice *dev)
79 struct stm32_reset_priv *priv = dev_get_priv(dev);
81 priv->base = dev_read_addr(dev);
82 if (priv->base == FDT_ADDR_T_NONE) {
83 /* for MFD, get address of parent */
84 priv->base = dev_read_addr(dev->parent);
85 if (priv->base == FDT_ADDR_T_NONE)
92 static const struct udevice_id stm32_reset_ids[] = {
93 { .compatible = "st,stm32mp1-rcc-rst", .data = RCC_STM32MP },
97 U_BOOT_DRIVER(stm32_rcc_reset) = {
98 .name = "stm32_rcc_reset",
100 .of_match = stm32_reset_ids,
101 .probe = stm32_reset_probe,
102 .priv_auto_alloc_size = sizeof(struct stm32_reset_priv),
103 .ops = &stm32_reset_ops,