CDX controller uses MCDI interface as a protocol to
communicate with the RPU firmware and registers the
detected CDX devices on the CDX bus. It also uses
RPMsg as the communication channel with the Firmware.
Signed-off-by: Nipun Gupta <nipun.gupta@xxxxxxx>
Signed-off-by: Puneet Gupta <puneet.gupta@xxxxxxx>
Signed-off-by: Nikhil Agarwal <nikhil.agarwal@xxxxxxx>
---
drivers/bus/cdx/controller/Kconfig | 9 +
drivers/bus/cdx/controller/Makefile | 2 +-
drivers/bus/cdx/controller/cdx_controller.c | 243 ++++++++++++++++++++
drivers/bus/cdx/controller/mcdi_functions.c | 125 ++++++++++
drivers/bus/cdx/controller/mcdi_functions.h | 50 ++++
5 files changed, 428 insertions(+), 1 deletion(-)
create mode 100644 drivers/bus/cdx/controller/cdx_controller.c
create mode 100644 drivers/bus/cdx/controller/mcdi_functions.c
create mode 100644 drivers/bus/cdx/controller/mcdi_functions.h
diff --git a/drivers/bus/cdx/controller/Kconfig b/drivers/bus/cdx/controller/Kconfig
index 785c71063b2a..17f9c6be2fe1 100644
--- a/drivers/bus/cdx/controller/Kconfig
+++ b/drivers/bus/cdx/controller/Kconfig
@@ -7,6 +7,15 @@
if CDX_BUS
+config CDX_CONTROLLER
+ tristate "CDX bus controller"
+ help
+ CDX controller drives the CDX bus. It interacts with
+ firmware to get the hardware devices and registers with
+ the CDX bus. Say Y to enable the CDX hardware driver.
+
+ If unsure, say N.
+
config MCDI_LOGGING
bool "MCDI Logging for the CDX controller"
depends on CDX_CONTROLLER
diff --git a/drivers/bus/cdx/controller/Makefile b/drivers/bus/cdx/controller/Makefile
index 0ce200678eda..f7437c882cc9 100644
--- a/drivers/bus/cdx/controller/Makefile
+++ b/drivers/bus/cdx/controller/Makefile
@@ -6,4 +6,4 @@
#
obj-$(CONFIG_CDX_CONTROLLER) += cdx-controller.o
-cdx-controller-objs := mcdi.o
+cdx-controller-objs := cdx_controller.o mcdi.o mcdi_functions.o
diff --git a/drivers/bus/cdx/controller/cdx_controller.c b/drivers/bus/cdx/controller/cdx_controller.c
new file mode 100644
index 000000000000..9b910c9cb31e
--- /dev/null
+++ b/drivers/bus/cdx/controller/cdx_controller.c
@@ -0,0 +1,243 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Platform driver for CDX bus controller.
+ *
+ * Copyright (C) 2022-2023, Advanced Micro Devices, Inc.
+ */
+
+#include <linux/of_platform.h>
+#include <linux/cdx/cdx_bus.h>
+
+#include "../cdx.h"
+#include "mcdi_functions.h"
+#include "mcdi.h"
+
+#define CDX_NUM_MCDI_BUFFERS 1
+
+/*
+ * Get an MCDI buffer
+ *
+ * The caller is responsible for preventing racing by holding the
+ * MCDI iface_lock.
+ */
+static bool cdx_mcdi_get_buf(struct cdx_mcdi *cdx, u8 *bufid)
+{
+ if (!bufid)
+ return false;
+
+ *bufid = ffz(cdx->mcdi_buf_use);
+
+ if (*bufid < CDX_NUM_MCDI_BUFFERS) {
+ set_bit(*bufid, &cdx->mcdi_buf_use);
+ return true;
+ }
+
+ return false;
+}
+
+/* Return an MCDI buffer */
+static void cdx_mcdi_put_buf(struct cdx_mcdi *cdx, u8 bufid)
+{
+ CDX_WARN_ON_PARANOID(bufid >= CDX_NUM_MCDI_BUFFERS);
+ CDX_WARN_ON_PARANOID(!test_bit(bufid, &cdx->mcdi_buf_use));
+
+ clear_bit(bufid, &cdx->mcdi_buf_use);
+}
+
+static unsigned int cdx_mcdi_rpc_timeout(struct cdx_mcdi *cdx, unsigned int cmd)
+{
+ return MCDI_RPC_TIMEOUT;
+}
+
+static void cdx_mcdi_request(struct cdx_mcdi *cdx, u8 bufid,
+ 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.
+ */
+}
+
+static void cdx_mcdi_read_response(struct cdx_mcdi *cdx_mcdi, u8 bufid,
+ struct cdx_dword *outbuf, size_t offset,
+ size_t outlen)
+{
+ /*
+ * This will get updated by rpmsg APIs, with RPMSG introduction
+ * in CDX controller as a transport layer.
+ */
+}
+
+static const struct cdx_mcdi_ops mcdi_ops = {
+ .mcdi_rpc_timeout = cdx_mcdi_rpc_timeout,
+ .mcdi_request = cdx_mcdi_request,
+ .mcdi_read_response = cdx_mcdi_read_response,
+ .mcdi_get_buf = cdx_mcdi_get_buf,
+ .mcdi_put_buf = cdx_mcdi_put_buf,
+};
+
+static int cdx_scan_devices(struct cdx_controller *cdx)
+{
+ struct cdx_mcdi *cdx_mcdi = cdx->priv;
+ u8 bus_num, dev_num, num_cdx_bus;
+ int ret;
+
+ /* MCDI FW Read: Fetch the number of CDX buses on this controller */
+ ret = cdx_mcdi_get_num_buses(cdx_mcdi);
+ if (ret < 0) {
+ dev_err(cdx->dev,
+ "Get number of CDX buses failed: %d\n", ret);
+ return ret;
+ }
+ num_cdx_bus = (u8)ret;
+
+ for (bus_num = 0; bus_num < num_cdx_bus; bus_num++) {
+ u8 num_cdx_dev;
+
+ /* MCDI FW Read: Fetch the number of devices present */
+ ret = cdx_mcdi_get_num_devs(cdx_mcdi, bus_num);
+ if (ret < 0) {
+ dev_err(cdx->dev,
+ "CDX bus %d has no devices: %d\n", bus_num, num_cdx_dev);
+ continue;
+ }
+ num_cdx_dev = (u8)ret;
+
+ for (dev_num = 0; dev_num < num_cdx_dev; dev_num++) {
+ struct cdx_dev_params dev_params;
+
+ /* MCDI FW: Get the device config */
+ ret = cdx_mcdi_get_dev_config(cdx_mcdi, bus_num,
+ dev_num, &dev_params);
+ if (ret) {
+ dev_err(cdx->dev,
+ "CDX device config get failed for %d(bus):%d(dev), %d\n",
+ bus_num, dev_num, ret);
+ continue;
+ }
+ dev_params.cdx = cdx;
+
+ /* Add the device to the cdx bus */
+ ret = cdx_device_add(&dev_params);
+ if (ret) {
+ dev_err(cdx->dev, "registering cdx dev: %d failed: %d\n",
+ dev_num, ret);
+ continue;
+ }
+
+ dev_dbg(cdx->dev, "CDX dev: %d on cdx bus: %d created\n",
+ dev_num, bus_num);
+ }
+ }
+
+ return 0;
+}
+
+static struct cdx_ops cdx_ops = {
+ .scan = cdx_scan_devices,
+};
+
+static int xlnx_cdx_probe(struct platform_device *pdev)
+{
+ struct cdx_controller *cdx;
+ struct cdx_mcdi *cdx_mcdi;
+ int ret;
+
+ cdx_mcdi = kzalloc(sizeof(*cdx_mcdi), GFP_KERNEL);
+ if (!cdx_mcdi)
+ return -ENOMEM;
+
+ /* Store the MCDI ops */
+ cdx_mcdi->mcdi_ops = &mcdi_ops;
+ /* MCDI FW: Initialize the FW path */
+ ret = cdx_mcdi_init(cdx_mcdi);
+ if (ret) {
+ dev_err_probe(&pdev->dev, ret, "MCDI Initialization failed\n");
+ goto mcdi_init_fail;
+ }
+
+ cdx = kzalloc(sizeof(*cdx), GFP_KERNEL);
+ if (!cdx) {
+ ret = -ENOMEM;
+ goto cdx_alloc_fail;
+ }
+ platform_set_drvdata(pdev, cdx);
+
+ cdx->dev = &pdev->dev;
+ cdx->priv = cdx_mcdi;
+ cdx->ops = &cdx_ops;
+
+ cdx_mcdi->mcdi_buf = kzalloc(MCDI_BUF_LEN, GFP_KERNEL);
+ if (!cdx_mcdi->mcdi_buf) {
+ ret = -ENOMEM;
+ goto cdx_mcdi_buf_fail;
+ }
+
+ dev_info(&pdev->dev, "Successfully registered CDX controller with RPMsg as transport\n");
+ return 0;
+
+cdx_mcdi_buf_fail:
+ kfree(cdx);
+cdx_alloc_fail:
+ cdx_mcdi_finish(cdx_mcdi);
+mcdi_init_fail:
+ kfree(cdx_mcdi);
+
+ return ret;
+}
+
+static int xlnx_cdx_remove(struct platform_device *pdev)
+{
+ struct cdx_controller *cdx = platform_get_drvdata(pdev);
+ struct cdx_mcdi *cdx_mcdi = cdx->priv;
+
+ kfree(cdx_mcdi->mcdi_buf);
+ kfree(cdx);
+
+ cdx_mcdi_finish(cdx_mcdi);
+ kfree(cdx_mcdi);
+
+ return 0;
+}
+
+static const struct of_device_id cdx_match_table[] = {
+ {.compatible = "xlnx,cdxbus-controller",},
+ { },
+};
+
+MODULE_DEVICE_TABLE(of, cdx_match_table);
+
+static struct platform_driver cdx_pdriver = {
+ .driver = {
+ .name = "cdx-controller",
+ .pm = NULL,
+ .of_match_table = cdx_match_table,
+ },
+ .probe = xlnx_cdx_probe,
+ .remove = xlnx_cdx_remove,
+};
+
+static int __init cdx_controller_init(void)
+{
+ int ret;
+
+ ret = platform_driver_register(&cdx_pdriver);
+ if (ret < 0)
+ pr_err("platform_driver_register() failed: %d\n", ret);
+
+ return ret;
+}
+
+static void __exit cdx_controller_exit(void)
+{
+ platform_driver_unregister(&cdx_pdriver);
+}
+
+module_init(cdx_controller_init);
+module_exit(cdx_controller_exit);
+
+MODULE_VERSION("1.0");
+MODULE_AUTHOR("AMD Inc.");
+MODULE_DESCRIPTION("CDX controller for AMD devices");
+MODULE_LICENSE("GPL");
diff --git a/drivers/bus/cdx/controller/mcdi_functions.c b/drivers/bus/cdx/controller/mcdi_functions.c
new file mode 100644
index 000000000000..3940a2c7919c
--- /dev/null
+++ b/drivers/bus/cdx/controller/mcdi_functions.c
@@ -0,0 +1,125 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2022-2023, Advanced Micro Devices, Inc.
+ */
+
+#include <linux/module.h>
+
+#include "mcdi.h"
+#include "mcdi_functions.h"
+
+int cdx_mcdi_get_num_buses(struct cdx_mcdi *cdx)
+{
+ MCDI_DECLARE_BUF(outbuf, MC_CMD_CDX_BUS_ENUM_BUSES_OUT_LEN);
+ size_t outlen;
+ int rc;
+
+ rc = cdx_mcdi_rpc(cdx, MC_CMD_CDX_BUS_ENUM_BUSES, NULL, 0,
+ outbuf, sizeof(outbuf), &outlen);
+ if (rc)
+ return rc;
+
+ if (outlen != MC_CMD_CDX_BUS_ENUM_BUSES_OUT_LEN)
+ return -EIO;
+
+ return MCDI_DWORD(outbuf, CDX_BUS_ENUM_BUSES_OUT_BUS_COUNT);
+}
+
+int cdx_mcdi_get_num_devs(struct cdx_mcdi *cdx, int bus_num)
+{
+ MCDI_DECLARE_BUF(outbuf, MC_CMD_CDX_BUS_ENUM_DEVICES_OUT_LEN);
+ MCDI_DECLARE_BUF(inbuf, MC_CMD_CDX_BUS_ENUM_DEVICES_IN_LEN);
+ size_t outlen;
+ int rc;
+
+ MCDI_SET_DWORD(inbuf, CDX_BUS_ENUM_DEVICES_IN_BUS, bus_num);
+
+ rc = cdx_mcdi_rpc(cdx, MC_CMD_CDX_BUS_ENUM_DEVICES, inbuf, sizeof(inbuf),
+ outbuf, sizeof(outbuf), &outlen);
+ if (rc)
+ return rc;
+
+ if (outlen != MC_CMD_CDX_BUS_ENUM_DEVICES_OUT_LEN)
+ return -EIO;
+
+ return MCDI_DWORD(outbuf, CDX_BUS_ENUM_DEVICES_OUT_DEVICE_COUNT);
+}
+
+int cdx_mcdi_get_dev_config(struct cdx_mcdi *cdx,
+ u8 bus_num, u8 dev_num,
+ struct cdx_dev_params *dev_params)
+{
+ MCDI_DECLARE_BUF(outbuf, MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_LEN);
+ MCDI_DECLARE_BUF(inbuf, MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_IN_LEN);
+ struct resource *res = &dev_params->res[0];
+ size_t outlen;
+ u32 req_id;
+ int rc;
+
+ MCDI_SET_DWORD(inbuf, CDX_BUS_GET_DEVICE_CONFIG_IN_BUS, bus_num);
+ MCDI_SET_DWORD(inbuf, CDX_BUS_GET_DEVICE_CONFIG_IN_DEVICE, dev_num);
+
+ rc = cdx_mcdi_rpc(cdx, MC_CMD_CDX_BUS_GET_DEVICE_CONFIG, inbuf, sizeof(inbuf),
+ outbuf, sizeof(outbuf), &outlen);
+ if (rc)
+ return rc;
+
+ if (outlen != MC_CMD_CDX_BUS_GET_DEVICE_CONFIG_OUT_LEN)
+ return -EIO;
+
+ dev_params->bus_num = bus_num;
+ dev_params->dev_num = dev_num;
+
+ req_id = MCDI_DWORD(outbuf, CDX_BUS_GET_DEVICE_CONFIG_OUT_REQUESTER_ID);
+ dev_params->req_id = req_id;
+
+ dev_params->res_count = 0;
+ if (MCDI_QWORD(outbuf, CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION0_SIZE) != 0) {
+ res[dev_params->res_count].start =
+ MCDI_QWORD(outbuf, CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION0_BASE);
+ res[dev_params->res_count].end =
+ MCDI_QWORD(outbuf, CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION0_BASE) +
+ MCDI_QWORD(outbuf,
+ CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION0_SIZE) - 1;
+ res[dev_params->res_count].flags = IORESOURCE_MEM;
+ dev_params->res_count++;
+ }
+
+ if (MCDI_QWORD(outbuf, CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION1_SIZE) != 0) {
+ res[dev_params->res_count].start =
+ MCDI_QWORD(outbuf, CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION1_BASE);
+ res[dev_params->res_count].end =
+ MCDI_QWORD(outbuf, CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION1_BASE) +
+ MCDI_QWORD(outbuf,
+ CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION1_SIZE) - 1;
+ res[dev_params->res_count].flags = IORESOURCE_MEM;
+ dev_params->res_count++;
+ }
+
+ if (MCDI_QWORD(outbuf, CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION2_SIZE) != 0) {
+ res[dev_params->res_count].start =
+ MCDI_QWORD(outbuf, CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION2_BASE);
+ res[dev_params->res_count].end =
+ MCDI_QWORD(outbuf, CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION2_BASE) +
+ MCDI_QWORD(outbuf,
+ CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION2_SIZE) - 1;
+ res[dev_params->res_count].flags = IORESOURCE_MEM;
+ dev_params->res_count++;
+ }
+
+ if (MCDI_QWORD(outbuf, CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION3_SIZE) != 0) {
+ res[dev_params->res_count].start =
+ MCDI_QWORD(outbuf, CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION3_BASE);
+ res[dev_params->res_count].end =
+ MCDI_QWORD(outbuf, CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION3_BASE) +
+ MCDI_QWORD(outbuf,
+ CDX_BUS_GET_DEVICE_CONFIG_OUT_MMIO_REGION3_SIZE) - 1;
+ res[dev_params->res_count].flags = IORESOURCE_MEM;
+ dev_params->res_count++;
+ }
+
+ dev_params->vendor = MCDI_WORD(outbuf, CDX_BUS_GET_DEVICE_CONFIG_OUT_VENDOR_ID);
+ dev_params->device = MCDI_WORD(outbuf, CDX_BUS_GET_DEVICE_CONFIG_OUT_DEVICE_ID);
+
+ return 0;
+}
diff --git a/drivers/bus/cdx/controller/mcdi_functions.h b/drivers/bus/cdx/controller/mcdi_functions.h
new file mode 100644
index 000000000000..97dfde18592f
--- /dev/null
+++ b/drivers/bus/cdx/controller/mcdi_functions.h
@@ -0,0 +1,50 @@
+/* SPDX-License-Identifier: GPL-2.0
+ *
+ * Header file for MCDI FW interaction for CDX bus.
+ *
+ * Copyright (C) 2022-2023, Advanced Micro Devices, Inc.
+ */
+
+#ifndef CDX_MCDI_FUNCTIONS_H
+#define CDX_MCDI_FUNCTIONS_H
+
+#include "mcdi.h"
+#include "../cdx.h"
+
+/**
+ * cdx_mcdi_get_num_buses - Get the total number of buses on
+ * the controller.
+ * @cdx: pointer to MCDI interface.
+ *
+ * @return: total number of buses available on the controller,
+ * <0 on failure
+ */
+int cdx_mcdi_get_num_buses(struct cdx_mcdi *cdx);
+
+/**
+ * cdx_mcdi_get_num_devs - Get the total number of devices on
+ * a particular bus of the controller.
+ * @cdx: pointer to MCDI interface.
+ * @bus_num: Bus number.
+ *
+ * @return: total number of devices available on the bus, <0 on failure
+ */
+int cdx_mcdi_get_num_devs(struct cdx_mcdi *cdx, int bus_num);
+
+/**
+ * cdx_mcdi_get_dev_config - Get configuration for a particular
+ * bus_num:dev_num
+ * @cdx: pointer to MCDI interface.
+ * @bus_num: Bus number.
+ * @dev_num: Device number.
+ * @dev_params: Pointer to cdx_dev_params, this is populated by this
+ * device with the configuration corresponding to the provided
+ * bus_num:dev_num.
+ *
+ * @return: 0 total number of devices available on the bus, <0 on failure
+ */
+int cdx_mcdi_get_dev_config(struct cdx_mcdi *cdx,
+ u8 bus_num, u8 dev_num,
+ struct cdx_dev_params *dev_params);
+
+#endif /* CDX_MCDI_FUNCTIONS_H */
--
2.17.1
