Update Linux to v5.10.109
Sourced from [1]
[1] https://cdn.kernel.org/pub/linux/kernel/v5.x/linux-5.10.109.tar.xz
Change-Id: I19bca9fc6762d4e63bcf3e4cba88bbe560d9c76c
Signed-off-by: Olivier Deprez <olivier.deprez@arm.com>
diff --git a/drivers/reset/reset-raspberrypi.c b/drivers/reset/reset-raspberrypi.c
new file mode 100644
index 0000000..02f59c0
--- /dev/null
+++ b/drivers/reset/reset-raspberrypi.c
@@ -0,0 +1,122 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Raspberry Pi 4 firmware reset driver
+ *
+ * Copyright (C) 2020 Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
+ */
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/reset-controller.h>
+#include <soc/bcm2835/raspberrypi-firmware.h>
+#include <dt-bindings/reset/raspberrypi,firmware-reset.h>
+
+struct rpi_reset {
+ struct reset_controller_dev rcdev;
+ struct rpi_firmware *fw;
+};
+
+static inline struct rpi_reset *to_rpi(struct reset_controller_dev *rcdev)
+{
+ return container_of(rcdev, struct rpi_reset, rcdev);
+}
+
+static int rpi_reset_reset(struct reset_controller_dev *rcdev, unsigned long id)
+{
+ struct rpi_reset *priv = to_rpi(rcdev);
+ u32 dev_addr;
+ int ret;
+
+ switch (id) {
+ case RASPBERRYPI_FIRMWARE_RESET_ID_USB:
+ /*
+ * The Raspberry Pi 4 gets its USB functionality from VL805, a
+ * PCIe chip that implements xHCI. After a PCI reset, VL805's
+ * firmware may either be loaded directly from an EEPROM or, if
+ * not present, by the SoC's co-processor, VideoCore. rpi's
+ * VideoCore OS contains both the non public firmware load
+ * logic and the VL805 firmware blob. This triggers the
+ * aforementioned process.
+ *
+ * The pci device address is expected is expected by the
+ * firmware encoded like this:
+ *
+ * PCI_BUS << 20 | PCI_SLOT << 15 | PCI_FUNC << 12
+ *
+ * But since rpi's PCIe is hardwired, we know the address in
+ * advance.
+ */
+ dev_addr = 0x100000;
+ ret = rpi_firmware_property(priv->fw, RPI_FIRMWARE_NOTIFY_XHCI_RESET,
+ &dev_addr, sizeof(dev_addr));
+ if (ret)
+ return ret;
+
+ /* Wait for vl805 to startup */
+ usleep_range(200, 1000);
+ break;
+
+ default:
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static const struct reset_control_ops rpi_reset_ops = {
+ .reset = rpi_reset_reset,
+};
+
+static int rpi_reset_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct rpi_firmware *fw;
+ struct device_node *np;
+ struct rpi_reset *priv;
+
+ np = of_get_parent(dev->of_node);
+ if (!np) {
+ dev_err(dev, "Missing firmware node\n");
+ return -ENOENT;
+ }
+
+ fw = rpi_firmware_get(np);
+ of_node_put(np);
+ if (!fw)
+ return -EPROBE_DEFER;
+
+ priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ dev_set_drvdata(dev, priv);
+
+ priv->fw = fw;
+ priv->rcdev.owner = THIS_MODULE;
+ priv->rcdev.nr_resets = RASPBERRYPI_FIRMWARE_RESET_NUM_IDS;
+ priv->rcdev.ops = &rpi_reset_ops;
+ priv->rcdev.of_node = dev->of_node;
+
+ return devm_reset_controller_register(dev, &priv->rcdev);
+}
+
+static const struct of_device_id rpi_reset_of_match[] = {
+ { .compatible = "raspberrypi,firmware-reset" },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, rpi_reset_of_match);
+
+static struct platform_driver rpi_reset_driver = {
+ .probe = rpi_reset_probe,
+ .driver = {
+ .name = "raspberrypi-reset",
+ .of_match_table = rpi_reset_of_match,
+ },
+};
+module_platform_driver(rpi_reset_driver);
+
+MODULE_AUTHOR("Nicolas Saenz Julienne <nsaenzjulienne@suse.de>");
+MODULE_DESCRIPTION("Raspberry Pi 4 firmware reset driver");
+MODULE_LICENSE("GPL");