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- /*
- * Copyright (C) STMicroelectronics SA 2017
- * Author(s): Patrice CHOTARD, <patrice.chotard@st.com> for STMicroelectronics.
- *
- * SPDX-License-Identifier: GPL-2.0+
- */
- #include <common.h>
- #include <dm.h>
- #include <errno.h>
- #include <reset-uclass.h>
- #include <asm/io.h>
- DECLARE_GLOBAL_DATA_PTR;
- struct stm32_reset_priv {
- fdt_addr_t base;
- };
- static int stm32_reset_request(struct reset_ctl *reset_ctl)
- {
- return 0;
- }
- static int stm32_reset_free(struct reset_ctl *reset_ctl)
- {
- return 0;
- }
- static int stm32_reset_assert(struct reset_ctl *reset_ctl)
- {
- struct stm32_reset_priv *priv = dev_get_priv(reset_ctl->dev);
- int bank = (reset_ctl->id / BITS_PER_LONG) * 4;
- int offset = reset_ctl->id % BITS_PER_LONG;
- debug("%s: reset id = %ld bank = %d offset = %d)\n", __func__,
- reset_ctl->id, bank, offset);
- setbits_le32(priv->base + bank, BIT(offset));
- return 0;
- }
- static int stm32_reset_deassert(struct reset_ctl *reset_ctl)
- {
- struct stm32_reset_priv *priv = dev_get_priv(reset_ctl->dev);
- int bank = (reset_ctl->id / BITS_PER_LONG) * 4;
- int offset = reset_ctl->id % BITS_PER_LONG;
- debug("%s: reset id = %ld bank = %d offset = %d)\n", __func__,
- reset_ctl->id, bank, offset);
- clrbits_le32(priv->base + bank, BIT(offset));
- return 0;
- }
- static const struct reset_ops stm32_reset_ops = {
- .request = stm32_reset_request,
- .free = stm32_reset_free,
- .rst_assert = stm32_reset_assert,
- .rst_deassert = stm32_reset_deassert,
- };
- static int stm32_reset_probe(struct udevice *dev)
- {
- struct stm32_reset_priv *priv = dev_get_priv(dev);
- priv->base = devfdt_get_addr(dev);
- if (priv->base == FDT_ADDR_T_NONE)
- return -EINVAL;
- return 0;
- }
- U_BOOT_DRIVER(stm32_rcc_reset) = {
- .name = "stm32_rcc_reset",
- .id = UCLASS_RESET,
- .probe = stm32_reset_probe,
- .priv_auto_alloc_size = sizeof(struct stm32_reset_priv),
- .ops = &stm32_reset_ops,
- };
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