From: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
To: mbrugger@suse.com, u-boot@lists.denx.de, bmeng.cn@gmail.com,
marex@denx.de, linux-kernel@vger.kernel.org
Cc: sjg@chromium.org, m.szyprowski@samsung.com,
s.nawrocki@samsung.com, mark.kettenis@xs4all.nl,
Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
Subject: [PATCH v4 2/5] reset: Add Raspberry Pi 4 firmware reset controller
Date: Fri, 12 Jun 2020 18:46:30 +0200 [thread overview]
Message-ID: <20200612164632.25648-3-nsaenzjulienne@suse.de> (raw)
In-Reply-To: <20200612164632.25648-1-nsaenzjulienne@suse.de>
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>
---
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 --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@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@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
--
2.26.2
next prev parent reply other threads:[~2020-06-12 16:47 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-12 16:46 [PATCH v4 0/5] usb: xhci: Load Raspberry Pi 4 VL805's firmware Nicolas Saenz Julienne
2020-06-12 16:46 ` [PATCH v4 1/5] arm: rpi: Add function to trigger VL805's firmware load Nicolas Saenz Julienne
2020-06-12 16:46 ` Nicolas Saenz Julienne [this message]
2020-06-12 16:46 ` [PATCH v4 3/5] configs: Enable support for reset controllers on RPi4 Nicolas Saenz Julienne
2020-06-12 16:46 ` [PATCH v4 4/5] dm: pci: Assign controller device node to root bridge Nicolas Saenz Julienne
2020-06-16 13:43 ` Simon Glass
2020-06-16 14:09 ` Nicolas Saenz Julienne
2020-06-16 23:31 ` Simon Glass
2020-06-17 19:15 ` Nicolas Saenz Julienne
2020-06-26 1:12 ` Simon Glass
2020-06-12 16:46 ` [PATCH v4 5/5] usb: xhci-pci: Add reset controller support Nicolas Saenz Julienne
2020-06-12 17:08 ` Marek Vasut
2020-06-15 8:56 ` Nicolas Saenz Julienne
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