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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
commitace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch)
treeb2d64bc10158fdd5497876388cd68142ca374ed3 /drivers/cdx/controller/cdx_rpmsg.c
parentInitial commit. (diff)
downloadlinux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz
linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/cdx/controller/cdx_rpmsg.c')
-rw-r--r--drivers/cdx/controller/cdx_rpmsg.c203
1 files changed, 203 insertions, 0 deletions
diff --git a/drivers/cdx/controller/cdx_rpmsg.c b/drivers/cdx/controller/cdx_rpmsg.c
new file mode 100644
index 0000000000..04b578a0be
--- /dev/null
+++ b/drivers/cdx/controller/cdx_rpmsg.c
@@ -0,0 +1,203 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Platform driver for CDX bus.
+ *
+ * Copyright (C) 2022-2023, Advanced Micro Devices, Inc.
+ */
+
+#include <linux/rpmsg.h>
+#include <linux/remoteproc.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/cdx/cdx_bus.h>
+#include <linux/module.h>
+
+#include "../cdx.h"
+#include "cdx_controller.h"
+#include "mcdi_functions.h"
+#include "mcdi.h"
+
+static struct rpmsg_device_id cdx_rpmsg_id_table[] = {
+ { .name = "mcdi_ipc" },
+ { },
+};
+MODULE_DEVICE_TABLE(rpmsg, cdx_rpmsg_id_table);
+
+int cdx_rpmsg_send(struct cdx_mcdi *cdx_mcdi,
+ const struct cdx_dword *hdr, size_t hdr_len,
+ const struct cdx_dword *sdu, size_t sdu_len)
+{
+ unsigned char *send_buf;
+ int ret;
+
+ send_buf = kzalloc(hdr_len + sdu_len, GFP_KERNEL);
+ if (!send_buf)
+ return -ENOMEM;
+
+ memcpy(send_buf, hdr, hdr_len);
+ memcpy(send_buf + hdr_len, sdu, sdu_len);
+
+ ret = rpmsg_send(cdx_mcdi->ept, send_buf, hdr_len + sdu_len);
+ kfree(send_buf);
+
+ return ret;
+}
+
+static int cdx_attach_to_rproc(struct platform_device *pdev)
+{
+ struct device_node *r5_core_node;
+ struct cdx_controller *cdx_c;
+ struct cdx_mcdi *cdx_mcdi;
+ struct device *dev;
+ struct rproc *rp;
+ int ret;
+
+ dev = &pdev->dev;
+ cdx_c = platform_get_drvdata(pdev);
+ cdx_mcdi = cdx_c->priv;
+
+ r5_core_node = of_parse_phandle(dev->of_node, "xlnx,rproc", 0);
+ if (!r5_core_node) {
+ dev_err(&pdev->dev, "xlnx,rproc: invalid phandle\n");
+ return -EINVAL;
+ }
+
+ rp = rproc_get_by_phandle(r5_core_node->phandle);
+ if (!rp) {
+ ret = -EPROBE_DEFER;
+ goto pdev_err;
+ }
+
+ /* Attach to remote processor */
+ ret = rproc_boot(rp);
+ if (ret) {
+ dev_err(&pdev->dev, "Failed to attach to remote processor\n");
+ rproc_put(rp);
+ goto pdev_err;
+ }
+
+ cdx_mcdi->r5_rproc = rp;
+pdev_err:
+ of_node_put(r5_core_node);
+ return ret;
+}
+
+static void cdx_detach_to_r5(struct platform_device *pdev)
+{
+ struct cdx_controller *cdx_c;
+ struct cdx_mcdi *cdx_mcdi;
+
+ cdx_c = platform_get_drvdata(pdev);
+ cdx_mcdi = cdx_c->priv;
+
+ rproc_detach(cdx_mcdi->r5_rproc);
+ rproc_put(cdx_mcdi->r5_rproc);
+}
+
+static int cdx_rpmsg_cb(struct rpmsg_device *rpdev, void *data,
+ int len, void *priv, u32 src)
+{
+ struct cdx_controller *cdx_c = dev_get_drvdata(&rpdev->dev);
+ struct cdx_mcdi *cdx_mcdi = cdx_c->priv;
+
+ if (len > MCDI_BUF_LEN)
+ return -EINVAL;
+
+ cdx_mcdi_process_cmd(cdx_mcdi, (struct cdx_dword *)data, len);
+
+ return 0;
+}
+
+static void cdx_rpmsg_post_probe_work(struct work_struct *work)
+{
+ struct cdx_controller *cdx_c;
+ struct cdx_mcdi *cdx_mcdi;
+
+ cdx_mcdi = container_of(work, struct cdx_mcdi, work);
+ cdx_c = dev_get_drvdata(&cdx_mcdi->rpdev->dev);
+ cdx_rpmsg_post_probe(cdx_c);
+}
+
+static int cdx_rpmsg_probe(struct rpmsg_device *rpdev)
+{
+ struct rpmsg_channel_info chinfo = {0};
+ struct cdx_controller *cdx_c;
+ struct cdx_mcdi *cdx_mcdi;
+
+ cdx_c = (struct cdx_controller *)cdx_rpmsg_id_table[0].driver_data;
+ cdx_mcdi = cdx_c->priv;
+
+ chinfo.src = RPMSG_ADDR_ANY;
+ chinfo.dst = rpdev->dst;
+ strscpy(chinfo.name, cdx_rpmsg_id_table[0].name,
+ strlen(cdx_rpmsg_id_table[0].name));
+
+ cdx_mcdi->ept = rpmsg_create_ept(rpdev, cdx_rpmsg_cb, NULL, chinfo);
+ if (!cdx_mcdi->ept) {
+ dev_err_probe(&rpdev->dev, -ENXIO,
+ "Failed to create ept for channel %s\n",
+ chinfo.name);
+ return -EINVAL;
+ }
+
+ cdx_mcdi->rpdev = rpdev;
+ dev_set_drvdata(&rpdev->dev, cdx_c);
+
+ schedule_work(&cdx_mcdi->work);
+ return 0;
+}
+
+static void cdx_rpmsg_remove(struct rpmsg_device *rpdev)
+{
+ struct cdx_controller *cdx_c = dev_get_drvdata(&rpdev->dev);
+ struct cdx_mcdi *cdx_mcdi = cdx_c->priv;
+
+ flush_work(&cdx_mcdi->work);
+ cdx_rpmsg_pre_remove(cdx_c);
+
+ rpmsg_destroy_ept(cdx_mcdi->ept);
+ dev_set_drvdata(&rpdev->dev, NULL);
+}
+
+static struct rpmsg_driver cdx_rpmsg_driver = {
+ .drv.name = KBUILD_MODNAME,
+ .id_table = cdx_rpmsg_id_table,
+ .probe = cdx_rpmsg_probe,
+ .remove = cdx_rpmsg_remove,
+ .callback = cdx_rpmsg_cb,
+};
+
+int cdx_setup_rpmsg(struct platform_device *pdev)
+{
+ struct cdx_controller *cdx_c;
+ struct cdx_mcdi *cdx_mcdi;
+ int ret;
+
+ /* Attach to remote processor */
+ ret = cdx_attach_to_rproc(pdev);
+ if (ret)
+ return ret;
+
+ cdx_c = platform_get_drvdata(pdev);
+ cdx_mcdi = cdx_c->priv;
+
+ /* Register RPMsg driver */
+ cdx_rpmsg_id_table[0].driver_data = (kernel_ulong_t)cdx_c;
+
+ INIT_WORK(&cdx_mcdi->work, cdx_rpmsg_post_probe_work);
+ ret = register_rpmsg_driver(&cdx_rpmsg_driver);
+ if (ret) {
+ dev_err(&pdev->dev,
+ "Failed to register cdx RPMsg driver: %d\n", ret);
+ cdx_detach_to_r5(pdev);
+ }
+
+ return ret;
+}
+
+void cdx_destroy_rpmsg(struct platform_device *pdev)
+{
+ unregister_rpmsg_driver(&cdx_rpmsg_driver);
+
+ cdx_detach_to_r5(pdev);
+}