reset: Add Raspberry Pi 4 firmware reset controller
Raspberry Pi 4's co-processor controls some of the board's HW
initialization process, but it's up to Linux to trigger it when
relevant. Introduce a reset controller capable of interfacing with
RPi4's co-processor that models these firmware initialization routines as
reset lines.
Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
Signed-off-by: Matthias Brugger <mbrugger@suse.com>
diff --git a/drivers/reset/Kconfig b/drivers/reset/Kconfig
index 58ba0c6..6d53561 100644
--- a/drivers/reset/Kconfig
+++ b/drivers/reset/Kconfig
@@ -153,4 +153,15 @@
depends on DM_RESET
help
Support generic syscon mapped register reset devices.
+
+config RESET_RASPBERRYPI
+ bool "Raspberry Pi 4 Firmware Reset Controller Driver"
+ depends on DM_RESET && ARCH_BCM283X
+ default USB_XHCI_PCI
+ help
+ Raspberry Pi 4's co-processor controls some of the board's HW
+ initialization process, but it's up to Linux to trigger it when
+ relevant. This driver provides a reset controller capable of
+ interfacing with RPi4's co-processor and model these firmware
+ initialization routines as reset lines.
endmenu
diff --git a/drivers/reset/Makefile b/drivers/reset/Makefile
index 433f1ec..8e0124b 100644
--- a/drivers/reset/Makefile
+++ b/drivers/reset/Makefile
@@ -24,3 +24,4 @@
obj-$(CONFIG_RESET_HISILICON) += reset-hisilicon.o
obj-$(CONFIG_RESET_IMX7) += reset-imx7.o
obj-$(CONFIG_RESET_SYSCON) += reset-syscon.o
+obj-$(CONFIG_RESET_RASPBERRYPI) += reset-raspberrypi.o
diff --git a/drivers/reset/reset-raspberrypi.c b/drivers/reset/reset-raspberrypi.c
new file mode 100644
index 0000000..e2d284e
--- /dev/null
+++ b/drivers/reset/reset-raspberrypi.c
@@ -0,0 +1,60 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Raspberry Pi 4 firmware reset driver
+ *
+ * Copyright (C) 2020 Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
+ */
+#include <common.h>
+#include <dm.h>
+#include <reset-uclass.h>
+#include <asm/arch/msg.h>
+#include <dt-bindings/reset/raspberrypi,firmware-reset.h>
+
+static int raspberrypi_reset_request(struct reset_ctl *reset_ctl)
+{
+ if (reset_ctl->id >= RASPBERRYPI_FIRMWARE_RESET_NUM_IDS)
+ return -EINVAL;
+
+ return 0;
+}
+
+static int raspberrypi_reset_free(struct reset_ctl *reset_ctl)
+{
+ return 0;
+}
+
+static int raspberrypi_reset_assert(struct reset_ctl *reset_ctl)
+{
+ switch (reset_ctl->id) {
+ case RASPBERRYPI_FIRMWARE_RESET_ID_USB:
+ bcm2711_notify_vl805_reset();
+ return 0;
+ default:
+ return -EINVAL;
+ }
+}
+
+static int raspberrypi_reset_deassert(struct reset_ctl *reset_ctl)
+{
+ return 0;
+}
+
+struct reset_ops raspberrypi_reset_ops = {
+ .request = raspberrypi_reset_request,
+ .rfree = raspberrypi_reset_free,
+ .rst_assert = raspberrypi_reset_assert,
+ .rst_deassert = raspberrypi_reset_deassert,
+};
+
+static const struct udevice_id raspberrypi_reset_ids[] = {
+ { .compatible = "raspberrypi,firmware-reset" },
+ { }
+};
+
+U_BOOT_DRIVER(raspberrypi_reset) = {
+ .name = "raspberrypi-reset",
+ .id = UCLASS_RESET,
+ .of_match = raspberrypi_reset_ids,
+ .ops = &raspberrypi_reset_ops,
+};
+