File 0021-pci-brcmstb-Add-RPi5-rescal-reset-f.patch of Package u-boot
From 02712a26fe4d475ba7b27ff1769bee8a10da7fdd Mon Sep 17 00:00:00 2001
From: Torsten Duwe <duwe@suse.de>
Date: Fri, 27 Feb 2026 16:23:36 +0100
Subject: [PATCH] pci: brcmstb: Add RPi5 rescal reset facilities
A driver for Broadcom rescal reset controllers ported from
linux/drivers/reset/reset-brcmstb-rescal.c to U-Boot.
Signed-off-by: Torsten Duwe <duwe@suse.de>
Link: https://lore.kernel.org/r/20260227152336.C7C2E68D0A@verein.lst.de
Signed-off-by: Matthias Brugger <mbrugger@suse.com>
---
configs/rpi_arm64_defconfig | 1 +
drivers/reset/Kconfig | 7 ++
drivers/reset/Makefile | 1 +
drivers/reset/reset-brcmstb-rescal.c | 103 +++++++++++++++++++++++++++
4 files changed, 112 insertions(+)
create mode 100644 drivers/reset/reset-brcmstb-rescal.c
diff --git a/configs/rpi_arm64_defconfig b/configs/rpi_arm64_defconfig
index 153d7ed301e..38af5029403 100644
--- a/configs/rpi_arm64_defconfig
+++ b/configs/rpi_arm64_defconfig
@@ -45,6 +45,7 @@ CONFIG_PCI_BRCMSTB=y
CONFIG_PINCTRL=y
# CONFIG_PINCTRL_GENERIC is not set
CONFIG_RESET_BRCMSTB=y
+CONFIG_RESET_BRCMSTB_RESCAL=y
CONFIG_DM_RNG=y
CONFIG_RNG_IPROC200=y
# CONFIG_REQUIRE_SERIAL_CONSOLE is not set
diff --git a/drivers/reset/Kconfig b/drivers/reset/Kconfig
index 7dd0a5880ba..358b4fa029e 100644
--- a/drivers/reset/Kconfig
+++ b/drivers/reset/Kconfig
@@ -70,6 +70,13 @@ config RESET_BRCMSTB
If you wish to use reset resources managed by the Broadcom
Reset Controller, say Y here. Otherwise, say N.
+config RESET_BRCMSTB_RESCAL
+ bool "Generic Rescal Reset controller driver for Broadcom"
+ help
+ Support rescal reset controller on Broadcom.
+ If you wish to use reset resources managed by the Broadcom
+ Reset Controller, say Y here. Otherwise, say N.
+
config RESET_UNIPHIER
bool "Reset controller driver for UniPhier SoCs"
depends on ARCH_UNIPHIER
diff --git a/drivers/reset/Makefile b/drivers/reset/Makefile
index ebf3d7425a4..c7a9da3268d 100644
--- a/drivers/reset/Makefile
+++ b/drivers/reset/Makefile
@@ -14,6 +14,7 @@ obj-$(CONFIG_RESET_TI_SCI) += reset-ti-sci.o
obj-$(CONFIG_RESET_HSDK) += reset-hsdk.o
obj-$(CONFIG_RESET_BCM6345) += reset-bcm6345.o
obj-$(CONFIG_RESET_BRCMSTB) += reset-brcmstb.o
+obj-$(CONFIG_RESET_BRCMSTB_RESCAL) += reset-brcmstb-rescal.o
obj-$(CONFIG_RESET_UNIPHIER) += reset-uniphier.o
obj-$(CONFIG_RESET_AST2500) += reset-ast2500.o
obj-$(CONFIG_RESET_AST2600) += reset-ast2600.o
diff --git a/drivers/reset/reset-brcmstb-rescal.c b/drivers/reset/reset-brcmstb-rescal.c
new file mode 100644
index 00000000000..fc8fcfa8b3f
--- /dev/null
+++ b/drivers/reset/reset-brcmstb-rescal.c
@@ -0,0 +1,103 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Broadcom STB generic reset controller
+ *
+ * Copyright (C) 2024 EPAM Systems
+ * Moved from linux kernel:
+ * Copyright (C) 2018-2020 Broadcom
+ */
+
+#include <asm/io.h>
+#include <dm.h>
+#include <dm/device_compat.h>
+#include <errno.h>
+#include <linux/bitops.h>
+#include <linux/delay.h>
+#include <linux/iopoll.h>
+#include <log.h>
+#include <malloc.h>
+#include <reset-uclass.h>
+
+#define BRCM_RESCAL_START 0x0
+#define BRCM_RESCAL_START_BIT BIT(0)
+#define BRCM_RESCAL_CTRL 0x4
+#define BRCM_RESCAL_STATUS 0x8
+#define BRCM_RESCAL_STATUS_BIT BIT(0)
+
+struct brcm_rescal_reset {
+ void __iomem *base;
+};
+
+/* Also doubles a deassert */
+static int brcm_rescal_reset_set(struct reset_ctl *rst)
+{
+ struct brcm_rescal_reset *data = dev_get_priv(rst->dev);
+ void __iomem *base = data->base;
+ u32 reg;
+ int ret;
+
+ reg = readl(base + BRCM_RESCAL_START);
+ writel(reg | BRCM_RESCAL_START_BIT, base + BRCM_RESCAL_START);
+ reg = readl(base + BRCM_RESCAL_START);
+ if (!(reg & BRCM_RESCAL_START_BIT)) {
+ dev_err(rst->dev, "failed to start SATA/PCIe rescal\n");
+ return -EIO;
+ }
+
+ ret = readl_poll_timeout(base + BRCM_RESCAL_STATUS, reg,
+ (reg & BRCM_RESCAL_STATUS_BIT), 100);
+ if (ret) {
+ dev_err(rst->dev, "time out on SATA/PCIe rescal\n");
+ return ret;
+ }
+
+ reg = readl(base + BRCM_RESCAL_START);
+ writel(reg & ~BRCM_RESCAL_START_BIT, base + BRCM_RESCAL_START);
+
+ dev_dbg(rst->dev, "SATA/PCIe rescal success\n");
+ return 0;
+}
+
+/* A dummy function - deassert/reset does all the work */
+static int brcm_rescal_reset_assert(struct reset_ctl *rst)
+{
+ return 0;
+}
+
+static int brcm_rescal_reset_xlate(struct reset_ctl *reset_ctl,
+ struct ofnode_phandle_args *args)
+{
+ /* This is needed if #reset-cells == 0. */
+ return 0;
+}
+
+static const struct reset_ops brcm_rescal_reset_ops = {
+ .rst_deassert = brcm_rescal_reset_set,
+ .rst_assert = brcm_rescal_reset_assert,
+ .of_xlate = brcm_rescal_reset_xlate,
+};
+
+static int brcm_rescal_reset_probe(struct udevice *dev)
+{
+ struct brcm_rescal_reset *data = dev_get_priv(dev);
+
+ data->base = dev_remap_addr(dev);
+ if (!data->base)
+ return -EINVAL;
+
+ return 0;
+}
+
+static const struct udevice_id brcm_rescal_reset_of_match[] = {
+ {.compatible = "brcm,bcm7216-pcie-sata-rescal"},
+ {},
+};
+
+U_BOOT_DRIVER(brcmstb_reset_rescal) = {
+ .name = "brcmstb-reset-rescal",
+ .id = UCLASS_RESET,
+ .of_match = brcm_rescal_reset_of_match,
+ .ops = &brcm_rescal_reset_ops,
+ .probe = brcm_rescal_reset_probe,
+ .priv_auto = sizeof(struct brcm_rescal_reset),
+};
