#include <linux/slab.h>
#include <linux/cdx/cdx_bus.h>
+#include "cdx_controller.h"
#include "../cdx.h"
#include "mcdi_functions.h"
#include "mcdi.h"
const struct cdx_dword *hdr, size_t hdr_len,
const struct cdx_dword *sdu, size_t sdu_len)
{
- /*
- * This will get updated by rpmsg APIs, with RPMSG introduction
- * in CDX controller as a transport layer.
- */
+ if (cdx_rpmsg_send(cdx, hdr, hdr_len, sdu, sdu_len))
+ dev_err(&cdx->rpdev->dev, "Failed to send rpmsg data\n");
}
static const struct cdx_mcdi_ops mcdi_ops = {
.mcdi_request = cdx_mcdi_request,
};
+void cdx_rpmsg_post_probe(struct cdx_controller *cdx)
+{
+ /* Register CDX controller with CDX bus driver */
+ if (cdx_register_controller(cdx))
+ dev_err(cdx->dev, "Failed to register CDX controller\n");
+}
+
+void cdx_rpmsg_pre_remove(struct cdx_controller *cdx)
+{
+ cdx_unregister_controller(cdx);
+ cdx_mcdi_wait_for_quiescence(cdx->priv, MCDI_RPC_TIMEOUT);
+}
+
static int cdx_scan_devices(struct cdx_controller *cdx)
{
struct cdx_mcdi *cdx_mcdi = cdx->priv;
cdx->priv = cdx_mcdi;
cdx->ops = &cdx_ops;
+ ret = cdx_setup_rpmsg(pdev);
+ if (ret) {
+ if (ret != -EPROBE_DEFER)
+ dev_err(&pdev->dev, "Failed to register CDX RPMsg transport\n");
+ goto cdx_rpmsg_fail;
+ }
+
+ dev_info(&pdev->dev, "Successfully registered CDX controller with RPMsg as transport\n");
return 0;
+cdx_rpmsg_fail:
+ kfree(cdx);
cdx_alloc_fail:
cdx_mcdi_finish(cdx_mcdi);
mcdi_init_fail:
struct cdx_controller *cdx = platform_get_drvdata(pdev);
struct cdx_mcdi *cdx_mcdi = cdx->priv;
+ cdx_destroy_rpmsg(pdev);
+
kfree(cdx);
cdx_mcdi_finish(cdx_mcdi);
--- /dev/null
+// 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_platform.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);
+}
projects / platform / kernel / linux-rpi.git / commitdiff