diff mbox series

[v6,2/4] reset: Add Raspberry Pi 4 firmware reset controller

Message ID 20200629163725.13330-3-nsaenzjulienne@suse.de
State Accepted
Commit f676eb217bdff3bd734a42c8f9bbc58c9100055c
Headers show
Series usb: xhci: Load Raspberry Pi 4 VL805's firmware | expand

Commit Message

Nicolas Saenz Julienne June 29, 2020, 4:37 p.m. UTC 
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 at suse.de>
---
 drivers/reset/Kconfig                         | 10 ++++
 drivers/reset/Makefile                        |  1 +
 drivers/reset/reset-raspberrypi.c             | 60 +++++++++++++++++++
 .../reset/raspberrypi,firmware-reset.h        | 13 ++++
 4 files changed, 84 insertions(+)
 create mode 100644 drivers/reset/reset-raspberrypi.c
 create mode 100644 include/dt-bindings/reset/raspberrypi,firmware-reset.h
diff mbox series

Patch

diff --git a/drivers/reset/Kconfig b/drivers/reset/Kconfig
index 88d3be1593..d02c1522e5 100644
--- a/drivers/reset/Kconfig
+++ b/drivers/reset/Kconfig
@@ -148,4 +148,14 @@  config RESET_IMX7
 	help
 	  Support for reset controller on i.MX7/8 SoCs.
 
+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 0a044d5d8c..be54dae725 100644
--- a/drivers/reset/Makefile
+++ b/drivers/reset/Makefile
@@ -23,3 +23,4 @@  obj-$(CONFIG_RESET_MTMIPS) += reset-mtmips.o
 obj-$(CONFIG_RESET_SUNXI) += reset-sunxi.o
 obj-$(CONFIG_RESET_HISILICON) += reset-hisilicon.o
 obj-$(CONFIG_RESET_IMX7) += reset-imx7.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 0000000000..e2d284e5ac
--- /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 at 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,
+};
+
diff --git a/include/dt-bindings/reset/raspberrypi,firmware-reset.h b/include/dt-bindings/reset/raspberrypi,firmware-reset.h
new file mode 100644
index 0000000000..1a4f4c7927
--- /dev/null
+++ b/include/dt-bindings/reset/raspberrypi,firmware-reset.h
@@ -0,0 +1,13 @@ 
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (c) 2020 Nicolas Saenz Julienne
+ * Author: Nicolas Saenz Julienne <nsaenzjulienne at suse.com>
+ */
+
+#ifndef _DT_BINDINGS_RASPBERRYPI_FIRMWARE_RESET_H
+#define _DT_BINDINGS_RASPBERRYPI_FIRMWARE_RESET_H
+
+#define RASPBERRYPI_FIRMWARE_RESET_ID_USB	0
+#define RASPBERRYPI_FIRMWARE_RESET_NUM_IDS	1
+
+#endif