GK SDK 源码库: XMIPCLinuxV100R005C00SPC030 (kernel/tools/open_source excluded)

2026-09-06 03:52:57 +08:00
commit b1928b41c0
21813 changed files with 4413081 additions and 0 deletions
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+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2017, STMicroelectronics - All Rights Reserved
+ * Author(s): Patrice Chotard, <patrice.chotard@st.com> for STMicroelectronics.
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <errno.h>
+#include <reset-uclass.h>
+#include <stm32_rcc.h>
+#include <asm/io.h>
+
+/* reset clear offset for STM32MP RCC */
+#define RCC_CL 0x4
+
+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);
+
+	if (dev_get_driver_data(reset_ctl->dev) == STM32MP1)
+		/* reset assert is done in rcc set register */
+		writel(BIT(offset), priv->base + bank);
+	else
+		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);
+
+	if (dev_get_driver_data(reset_ctl->dev) == STM32MP1)
+		/* reset deassert is done in rcc clr register */
+		writel(BIT(offset), priv->base + bank + RCC_CL);
+	else
+		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 = dev_read_addr(dev);
+	if (priv->base == FDT_ADDR_T_NONE) {
+		/* for MFD, get address of parent */
+		priv->base = dev_read_addr(dev->parent);
+		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,
+};