@@ -2,7 +2,7 @@
/*
* Texas Instruments System Control Interface Protocol Driver
*
- * Copyright (C) 2015-2022 Texas Instruments Incorporated - https://www.ti.com/
+ * Copyright (C) 2015-2024 Texas Instruments Incorporated - https://www.ti.com/
* Nishanth Menon
*/
@@ -24,6 +24,7 @@
#include <linux/slab.h>
#include <linux/soc/ti/ti-msgmgr.h>
#include <linux/soc/ti/ti_sci_protocol.h>
+#include <linux/sys_soc.h>
#include <linux/reboot.h>
#include "ti_sci.h"
@@ -98,6 +99,7 @@ struct ti_sci_desc {
* @minfo: Message info
* @node: list head
* @host_id: Host ID
+ * @fw_caps: FW/SoC low power capabilities
* @users: Number of users of this instance
*/
struct ti_sci_info {
@@ -114,6 +116,7 @@ struct ti_sci_info {
struct ti_sci_xfers_info minfo;
struct list_head node;
u8 host_id;
+ u64 fw_caps;
/* protected by ti_sci_list_mutex */
int users;
};
@@ -1651,6 +1654,67 @@ static int ti_sci_cmd_clk_get_freq(const struct ti_sci_handle *handle,
return ret;
}
+/**
+ * ti_sci_msg_cmd_query_fw_caps() - Get the FW/SoC capabilities
+ * @handle: Pointer to TI SCI handle
+ * @fw_caps: Each bit in fw_caps indicating one FW/SOC capability
+ *
+ * Check if the firmware supports any optional low power modes.
+ * Old revisions of TIFS (< 08.04) will NACK the request which results in
+ * -ENODEV being returned.
+ *
+ * Return: 0 if all went well, else returns appropriate error value.
+ */
+static int ti_sci_msg_cmd_query_fw_caps(const struct ti_sci_handle *handle,
+ u64 *fw_caps)
+{
+ struct ti_sci_info *info;
+ struct ti_sci_xfer *xfer;
+ struct ti_sci_msg_resp_query_fw_caps *resp;
+ struct device *dev;
+ int ret = 0;
+
+ if (IS_ERR(handle))
+ return PTR_ERR(handle);
+ if (!handle)
+ return -EINVAL;
+
+ info = handle_to_ti_sci_info(handle);
+ dev = info->dev;
+
+ xfer = ti_sci_get_one_xfer(info, TI_SCI_MSG_QUERY_FW_CAPS,
+ TI_SCI_FLAG_REQ_ACK_ON_PROCESSED,
+ sizeof(struct ti_sci_msg_hdr),
+ sizeof(*resp));
+ if (IS_ERR(xfer)) {
+ ret = PTR_ERR(xfer);
+ dev_err(dev, "Message alloc failed(%d)\n", ret);
+ return ret;
+ }
+
+ ret = ti_sci_do_xfer(info, xfer);
+ if (ret) {
+ dev_err(dev, "Mbox send fail %d\n", ret);
+ goto fail;
+ }
+
+ resp = (struct ti_sci_msg_resp_query_fw_caps *)xfer->xfer_buf;
+
+ if (!ti_sci_is_response_ack(resp)) {
+ dev_err(dev, "Failed to get capabilities\n");
+ ret = -ENODEV;
+ goto fail;
+ }
+
+ if (fw_caps)
+ *fw_caps = resp->fw_caps;
+
+fail:
+ ti_sci_put_one_xfer(&info->minfo, xfer);
+
+ return ret;
+}
+
static int ti_sci_cmd_core_reboot(const struct ti_sci_handle *handle)
{
struct ti_sci_info *info;
@@ -3390,6 +3454,13 @@ static int ti_sci_probe(struct platform_device *pdev)
goto out;
}
+ ti_sci_msg_cmd_query_fw_caps(&info->handle, &info->fw_caps);
+ dev_dbg(dev, "Detected firmware capabilities: %s%s%s\n",
+ info->fw_caps & MSG_FLAG_CAPS_GENERIC ? "Generic" : "",
+ info->fw_caps & MSG_FLAG_CAPS_LPM_PARTIAL_IO ? " Partial-IO" : "",
+ info->fw_caps & MSG_FLAG_CAPS_LPM_DM_MANAGED ? " DM-Managed" : ""
+ );
+
ti_sci_setup_ops(info);
ret = devm_register_restart_handler(dev, tisci_reboot_handler, info);
@@ -19,6 +19,7 @@
#define TI_SCI_MSG_WAKE_REASON 0x0003
#define TI_SCI_MSG_GOODBYE 0x0004
#define TI_SCI_MSG_SYS_RESET 0x0005
+#define TI_SCI_MSG_QUERY_FW_CAPS 0x0022
/* Device requests */
#define TI_SCI_MSG_SET_DEVICE_STATE 0x0200
@@ -132,6 +133,27 @@ struct ti_sci_msg_req_reboot {
struct ti_sci_msg_hdr hdr;
} __packed;
+/**
+ * struct ti_sci_msg_resp_query_fw_caps - Response for query firmware caps
+ * @hdr: Generic header
+ * @fw_caps: Each bit in fw_caps indicating one FW/SOC capability
+ * MSG_FLAG_CAPS_GENERIC: Generic capability (LPM not supported)
+ * MSG_FLAG_CAPS_LPM_PARTIAL_IO: Partial IO in LPM
+ * MSG_FLAG_CAPS_LPM_DM_MANAGED: LPM can be managed by DM
+ *
+ * Response to a generic message with message type TI_SCI_MSG_QUERY_FW_CAPS
+ * providing currently available SOC/firmware capabilities. SoC that don't
+ * support low power modes return only MSG_FLAG_CAPS_GENERIC capability.
+ */
+struct ti_sci_msg_resp_query_fw_caps {
+ struct ti_sci_msg_hdr hdr;
+#define MSG_FLAG_CAPS_GENERIC TI_SCI_MSG_FLAG(0)
+#define MSG_FLAG_CAPS_LPM_PARTIAL_IO TI_SCI_MSG_FLAG(4)
+#define MSG_FLAG_CAPS_LPM_DM_MANAGED TI_SCI_MSG_FLAG(5)
+#define MSG_MASK_CAPS_LPM GENMASK_ULL(4, 1)
+ u64 fw_caps;
+} __packed;
+
/**
* struct ti_sci_msg_req_set_device_state - Set the desired state of the device
* @hdr: Generic header