firmware: ti_sci: Add support for processor control

Texas Instrument's System Control Interface (TI-SCI) Message Protocol
is used in Texas Instrument's System on Chip (SoC) such as those
in K3 family AM654 SoC to communicate between various compute
processors with a central system controller entity.

The system controller provides various services including the control
of other compute processors within the SoC. Extend the TI-SCI protocol
support to add various TI-SCI commands to invoke services associated
with power and reset control, and boot vector management of the
various compute processors from the Linux kernel.

Signed-off-by: Suman Anna <s-anna@ti.com>

drivers/firmware/ti_sci.c

@@ -2636,6 +2636,348 @@ fail:
 	return ret;
 }
 
+/**
+ * ti_sci_cmd_proc_request() - Command to request a physical processor control
+ * @handle:	Pointer to TI SCI handle
+ * @proc_id:	Processor ID this request is for
+ *
+ * Return: 0 if all went well, else returns appropriate error value.
+ */
+static int ti_sci_cmd_proc_request(const struct ti_sci_handle *handle,
+				   u8 proc_id)
+{
+	struct ti_sci_msg_req_proc_request *req;
+	struct ti_sci_msg_hdr *resp;
+	struct ti_sci_info *info;
+	struct ti_sci_xfer *xfer;
+	struct device *dev;
+	int ret = 0;
+
+	if (!handle)
+		return -EINVAL;
+	if (IS_ERR(handle))
+		return PTR_ERR(handle);
+
+	info = handle_to_ti_sci_info(handle);
+	dev = info->dev;
+
+	xfer = ti_sci_get_one_xfer(info, TI_SCI_MSG_PROC_REQUEST,
+				   TI_SCI_FLAG_REQ_ACK_ON_PROCESSED,
+				   sizeof(*req), sizeof(*resp));
+	if (IS_ERR(xfer)) {
+		ret = PTR_ERR(xfer);
+		dev_err(dev, "Message alloc failed(%d)\n", ret);
+		return ret;
+	}
+	req = (struct ti_sci_msg_req_proc_request *)xfer->xfer_buf;
+	req->processor_id = proc_id;
+
+	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_hdr *)xfer->tx_message.buf;
+
+	ret = ti_sci_is_response_ack(resp) ? 0 : -ENODEV;
+
+fail:
+	ti_sci_put_one_xfer(&info->minfo, xfer);
+
+	return ret;
+}
+
+/**
+ * ti_sci_cmd_proc_release() - Command to release a physical processor control
+ * @handle:	Pointer to TI SCI handle
+ * @proc_id:	Processor ID this request is for
+ *
+ * Return: 0 if all went well, else returns appropriate error value.
+ */
+static int ti_sci_cmd_proc_release(const struct ti_sci_handle *handle,
+				   u8 proc_id)
+{
+	struct ti_sci_msg_req_proc_release *req;
+	struct ti_sci_msg_hdr *resp;
+	struct ti_sci_info *info;
+	struct ti_sci_xfer *xfer;
+	struct device *dev;
+	int ret = 0;
+
+	if (!handle)
+		return -EINVAL;
+	if (IS_ERR(handle))
+		return PTR_ERR(handle);
+
+	info = handle_to_ti_sci_info(handle);
+	dev = info->dev;
+
+	xfer = ti_sci_get_one_xfer(info, TI_SCI_MSG_PROC_RELEASE,
+				   TI_SCI_FLAG_REQ_ACK_ON_PROCESSED,
+				   sizeof(*req), sizeof(*resp));
+	if (IS_ERR(xfer)) {
+		ret = PTR_ERR(xfer);
+		dev_err(dev, "Message alloc failed(%d)\n", ret);
+		return ret;
+	}
+	req = (struct ti_sci_msg_req_proc_release *)xfer->xfer_buf;
+	req->processor_id = proc_id;
+
+	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_hdr *)xfer->tx_message.buf;
+
+	ret = ti_sci_is_response_ack(resp) ? 0 : -ENODEV;
+
+fail:
+	ti_sci_put_one_xfer(&info->minfo, xfer);
+
+	return ret;
+}
+
+/**
+ * ti_sci_cmd_proc_handover() - Command to handover a physical processor
+ *				control to a host in the processor's access
+ *				control list.
+ * @handle:	Pointer to TI SCI handle
+ * @proc_id:	Processor ID this request is for
+ * @host_id:	Host ID to get the control of the processor
+ *
+ * Return: 0 if all went well, else returns appropriate error value.
+ */
+static int ti_sci_cmd_proc_handover(const struct ti_sci_handle *handle,
+				    u8 proc_id, u8 host_id)
+{
+	struct ti_sci_msg_req_proc_handover *req;
+	struct ti_sci_msg_hdr *resp;
+	struct ti_sci_info *info;
+	struct ti_sci_xfer *xfer;
+	struct device *dev;
+	int ret = 0;
+
+	if (!handle)
+		return -EINVAL;
+	if (IS_ERR(handle))
+		return PTR_ERR(handle);
+
+	info = handle_to_ti_sci_info(handle);
+	dev = info->dev;
+
+	xfer = ti_sci_get_one_xfer(info, TI_SCI_MSG_PROC_HANDOVER,
+				   TI_SCI_FLAG_REQ_ACK_ON_PROCESSED,
+				   sizeof(*req), sizeof(*resp));
+	if (IS_ERR(xfer)) {
+		ret = PTR_ERR(xfer);
+		dev_err(dev, "Message alloc failed(%d)\n", ret);
+		return ret;
+	}
+	req = (struct ti_sci_msg_req_proc_handover *)xfer->xfer_buf;
+	req->processor_id = proc_id;
+	req->host_id = host_id;
+
+	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_hdr *)xfer->tx_message.buf;
+
+	ret = ti_sci_is_response_ack(resp) ? 0 : -ENODEV;
+
+fail:
+	ti_sci_put_one_xfer(&info->minfo, xfer);
+
+	return ret;
+}
+
+/**
+ * ti_sci_cmd_proc_set_config() - Command to set the processor boot
+ *				    configuration flags
+ * @handle:		Pointer to TI SCI handle
+ * @proc_id:		Processor ID this request is for
+ * @config_flags_set:	Configuration flags to be set
+ * @config_flags_clear:	Configuration flags to be cleared.
+ *
+ * Return: 0 if all went well, else returns appropriate error value.
+ */
+static int ti_sci_cmd_proc_set_config(const struct ti_sci_handle *handle,
+				      u8 proc_id, u64 bootvector,
+				      u32 config_flags_set,
+				      u32 config_flags_clear)
+{
+	struct ti_sci_msg_req_set_config *req;
+	struct ti_sci_msg_hdr *resp;
+	struct ti_sci_info *info;
+	struct ti_sci_xfer *xfer;
+	struct device *dev;
+	int ret = 0;
+
+	if (!handle)
+		return -EINVAL;
+	if (IS_ERR(handle))
+		return PTR_ERR(handle);
+
+	info = handle_to_ti_sci_info(handle);
+	dev = info->dev;
+
+	xfer = ti_sci_get_one_xfer(info, TI_SCI_MSG_SET_CONFIG,
+				   TI_SCI_FLAG_REQ_ACK_ON_PROCESSED,
+				   sizeof(*req), sizeof(*resp));
+	if (IS_ERR(xfer)) {
+		ret = PTR_ERR(xfer);
+		dev_err(dev, "Message alloc failed(%d)\n", ret);
+		return ret;
+	}
+	req = (struct ti_sci_msg_req_set_config *)xfer->xfer_buf;
+	req->processor_id = proc_id;
+	req->bootvector_low = bootvector & TI_SCI_ADDR_LOW_MASK;
+	req->bootvector_high = (bootvector & TI_SCI_ADDR_HIGH_MASK) >>
+				TI_SCI_ADDR_HIGH_SHIFT;
+	req->config_flags_set = config_flags_set;
+	req->config_flags_clear = config_flags_clear;
+
+	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_hdr *)xfer->tx_message.buf;
+
+	ret = ti_sci_is_response_ack(resp) ? 0 : -ENODEV;
+
+fail:
+	ti_sci_put_one_xfer(&info->minfo, xfer);
+
+	return ret;
+}
+
+/**
+ * ti_sci_cmd_proc_set_control() - Command to set the processor boot
+ *				     control flags
+ * @handle:			Pointer to TI SCI handle
+ * @proc_id:			Processor ID this request is for
+ * @control_flags_set:		Control flags to be set
+ * @control_flags_clear:	Control flags to be cleared
+ *
+ * Return: 0 if all went well, else returns appropriate error value.
+ */
+static int ti_sci_cmd_proc_set_control(const struct ti_sci_handle *handle,
+				       u8 proc_id, u32 control_flags_set,
+				       u32 control_flags_clear)
+{
+	struct ti_sci_msg_req_set_ctrl *req;
+	struct ti_sci_msg_hdr *resp;
+	struct ti_sci_info *info;
+	struct ti_sci_xfer *xfer;
+	struct device *dev;
+	int ret = 0;
+
+	if (!handle)
+		return -EINVAL;
+	if (IS_ERR(handle))
+		return PTR_ERR(handle);
+
+	info = handle_to_ti_sci_info(handle);
+	dev = info->dev;
+
+	xfer = ti_sci_get_one_xfer(info, TI_SCI_MSG_SET_CTRL,
+				   TI_SCI_FLAG_REQ_ACK_ON_PROCESSED,
+				   sizeof(*req), sizeof(*resp));
+	if (IS_ERR(xfer)) {
+		ret = PTR_ERR(xfer);
+		dev_err(dev, "Message alloc failed(%d)\n", ret);
+		return ret;
+	}
+	req = (struct ti_sci_msg_req_set_ctrl *)xfer->xfer_buf;
+	req->processor_id = proc_id;
+	req->control_flags_set = control_flags_set;
+	req->control_flags_clear = control_flags_clear;
+
+	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_hdr *)xfer->tx_message.buf;
+
+	ret = ti_sci_is_response_ack(resp) ? 0 : -ENODEV;
+
+fail:
+	ti_sci_put_one_xfer(&info->minfo, xfer);
+
+	return ret;
+}
+
+/**
+ * ti_sci_cmd_get_boot_status() - Command to get the processor boot status
+ * @handle:	Pointer to TI SCI handle
+ * @proc_id:	Processor ID this request is for
+ *
+ * Return: 0 if all went well, else returns appropriate error value.
+ */
+static int ti_sci_cmd_proc_get_status(const struct ti_sci_handle *handle,
+				      u8 proc_id, u64 *bv, u32 *cfg_flags,
+				      u32 *ctrl_flags, u32 *sts_flags)
+{
+	struct ti_sci_msg_resp_get_status *resp;
+	struct ti_sci_msg_req_get_status *req;
+	struct ti_sci_info *info;
+	struct ti_sci_xfer *xfer;
+	struct device *dev;
+	int ret = 0;
+
+	if (!handle)
+		return -EINVAL;
+	if (IS_ERR(handle))
+		return PTR_ERR(handle);
+
+	info = handle_to_ti_sci_info(handle);
+	dev = info->dev;
+
+	xfer = ti_sci_get_one_xfer(info, TI_SCI_MSG_GET_STATUS,
+				   TI_SCI_FLAG_REQ_ACK_ON_PROCESSED,
+				   sizeof(*req), sizeof(*resp));
+	if (IS_ERR(xfer)) {
+		ret = PTR_ERR(xfer);
+		dev_err(dev, "Message alloc failed(%d)\n", ret);
+		return ret;
+	}
+	req = (struct ti_sci_msg_req_get_status *)xfer->xfer_buf;
+	req->processor_id = proc_id;
+
+	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_get_status *)xfer->tx_message.buf;
+
+	if (!ti_sci_is_response_ack(resp)) {
+		ret = -ENODEV;
+	} else {
+		*bv = (resp->bootvector_low & TI_SCI_ADDR_LOW_MASK) |
+		      (((u64)resp->bootvector_high << TI_SCI_ADDR_HIGH_SHIFT) &
+		       TI_SCI_ADDR_HIGH_MASK);
+		*cfg_flags = resp->config_flags;
+		*ctrl_flags = resp->control_flags;
+		*sts_flags = resp->status_flags;
+	}
+
+fail:
+	ti_sci_put_one_xfer(&info->minfo, xfer);
+
+	return ret;
+}
+
 /*
  * ti_sci_setup_ops() - Setup the operations structures
  * @info:	pointer to TISCI pointer
@@ -2648,6 +2990,7 @@ static void ti_sci_setup_ops(struct ti_sci_info *info)
 	struct ti_sci_clk_ops *cops = &ops->clk_ops;
 	struct ti_sci_rm_core_ops *rm_core_ops = &ops->rm_core_ops;
 	struct ti_sci_rm_irq_ops *iops = &ops->rm_irq_ops;
+	struct ti_sci_proc_ops *pops = &ops->proc_ops;
 	struct ti_sci_rm_ringacc_ops *rops = &ops->rm_ring_ops;
 	struct ti_sci_rm_psil_ops *psilops = &ops->rm_psil_ops;
 	struct ti_sci_rm_udmap_ops *udmap_ops = &ops->rm_udmap_ops;
@@ -2698,6 +3041,13 @@ static void ti_sci_setup_ops(struct ti_sci_info *info)
 	iops->free_event_irq_from_shost = ti_sci_cmd_free_event_irq_from_shost;
 	iops->free_event_irq_to_poll = ti_sci_cmd_free_event_irq_to_poll;
 
+	pops->request = ti_sci_cmd_proc_request;
+	pops->release = ti_sci_cmd_proc_release;
+	pops->handover = ti_sci_cmd_proc_handover;
+	pops->set_config = ti_sci_cmd_proc_set_config;
+	pops->set_control = ti_sci_cmd_proc_set_control;
+	pops->get_status = ti_sci_cmd_proc_get_status;
+
 	rops->config = ti_sci_cmd_ring_config;
 	rops->get_config = ti_sci_cmd_ring_get_config;
 

drivers/firmware/ti_sci.h

@@ -42,6 +42,14 @@
 #define TI_SCI_MSG_SET_IRQ		0x1000
 #define TI_SCI_MSG_FREE_IRQ		0x1001
 
+/* Processor Control requests */
+#define TI_SCI_MSG_PROC_REQUEST		0xc000
+#define TI_SCI_MSG_PROC_RELEASE		0xc001
+#define TI_SCI_MSG_PROC_HANDOVER	0xc005
+#define TI_SCI_MSG_SET_CONFIG		0xc100
+#define TI_SCI_MSG_SET_CTRL		0xc101
+#define TI_SCI_MSG_GET_STATUS		0xc400
+
 /* NAVSS resource management */
 /* Ringacc requests */
 #define TI_SCI_MSG_RM_RING_ALLOCATE		0x1100
@@ -592,6 +600,133 @@ struct ti_sci_msg_req_manage_irq {
 	u8 secondary_host;
 } __packed;
 
+/**
+ * struct ti_sci_msg_req_proc_request - Request a processor
+ * @hdr:		Generic Header
+ * @processor_id:	ID of processor being requested
+ *
+ * Request type is TI_SCI_MSG_PROC_REQUEST, response is a generic ACK/NACK
+ * message.
+ */
+struct ti_sci_msg_req_proc_request {
+	struct ti_sci_msg_hdr hdr;
+	u8 processor_id;
+} __packed;
+
+/**
+ * struct ti_sci_msg_req_proc_release - Release a processor
+ * @hdr:		Generic Header
+ * @processor_id:	ID of processor being released
+ *
+ * Request type is TI_SCI_MSG_PROC_RELEASE, response is a generic ACK/NACK
+ * message.
+ */
+struct ti_sci_msg_req_proc_release {
+	struct ti_sci_msg_hdr hdr;
+	u8 processor_id;
+} __packed;
+
+/**
+ * struct ti_sci_msg_req_proc_handover - Handover a processor to a host
+ * @hdr:		Generic Header
+ * @processor_id:	ID of processor being handed over
+ * @host_id:		Host ID the control needs to be transferred to
+ *
+ * Request type is TI_SCI_MSG_PROC_HANDOVER, response is a generic ACK/NACK
+ * message.
+ */
+struct ti_sci_msg_req_proc_handover {
+	struct ti_sci_msg_hdr hdr;
+	u8 processor_id;
+	u8 host_id;
+} __packed;
+
+/* Boot Vector masks */
+#define TI_SCI_ADDR_LOW_MASK			GENMASK_ULL(31, 0)
+#define TI_SCI_ADDR_HIGH_MASK			GENMASK_ULL(63, 32)
+#define TI_SCI_ADDR_HIGH_SHIFT			32
+
+/**
+ * struct ti_sci_msg_req_set_config - Set Processor boot configuration
+ * @hdr:		Generic Header
+ * @processor_id:	ID of processor being configured
+ * @bootvector_low:	Lower 32 bit address (Little Endian) of boot vector
+ * @bootvector_high:	Higher 32 bit address (Little Endian) of boot vector
+ * @config_flags_set:	Optional Processor specific Config Flags to set.
+ *			Setting a bit here implies the corresponding mode
+ *			will be set
+ * @config_flags_clear:	Optional Processor specific Config Flags to clear.
+ *			Setting a bit here implies the corresponding mode
+ *			will be cleared
+ *
+ * Request type is TI_SCI_MSG_PROC_HANDOVER, response is a generic ACK/NACK
+ * message.
+ */
+struct ti_sci_msg_req_set_config {
+	struct ti_sci_msg_hdr hdr;
+	u8 processor_id;
+	u32 bootvector_low;
+	u32 bootvector_high;
+	u32 config_flags_set;
+	u32 config_flags_clear;
+} __packed;
+
+/**
+ * struct ti_sci_msg_req_set_ctrl - Set Processor boot control flags
+ * @hdr:		Generic Header
+ * @processor_id:	ID of processor being configured
+ * @control_flags_set:	Optional Processor specific Control Flags to set.
+ *			Setting a bit here implies the corresponding mode
+ *			will be set
+ * @control_flags_clear:Optional Processor specific Control Flags to clear.
+ *			Setting a bit here implies the corresponding mode
+ *			will be cleared
+ *
+ * Request type is TI_SCI_MSG_SET_CTRL, response is a generic ACK/NACK
+ * message.
+ */
+struct ti_sci_msg_req_set_ctrl {
+	struct ti_sci_msg_hdr hdr;
+	u8 processor_id;
+	u32 control_flags_set;
+	u32 control_flags_clear;
+} __packed;
+
+/**
+ * struct ti_sci_msg_req_get_status - Processor boot status request
+ * @hdr:		Generic Header
+ * @processor_id:	ID of processor whose status is being requested
+ *
+ * Request type is TI_SCI_MSG_GET_STATUS, response is an appropriate
+ * message, or NACK in case of inability to satisfy request.
+ */
+struct ti_sci_msg_req_get_status {
+	struct ti_sci_msg_hdr hdr;
+	u8 processor_id;
+} __packed;
+
+/**
+ * struct ti_sci_msg_resp_get_status - Processor boot status response
+ * @hdr:		Generic Header
+ * @processor_id:	ID of processor whose status is returned
+ * @bootvector_low:	Lower 32 bit address (Little Endian) of boot vector
+ * @bootvector_high:	Higher 32 bit address (Little Endian) of boot vector
+ * @config_flags:	Optional Processor specific Config Flags set currently
+ * @control_flags:	Optional Processor specific Control Flags set currently
+ * @status_flags:	Optional Processor specific Status Flags set currently
+ *
+ * Response structure to a TI_SCI_MSG_GET_STATUS request.
+ */
+struct ti_sci_msg_resp_get_status {
+	struct ti_sci_msg_hdr hdr;
+	u8 processor_id;
+	u32 bootvector_low;
+	u32 bootvector_high;
+	u32 config_flags;
+	u32 control_flags;
+	u32 status_flags;
+} __packed;
+
 /**
  * struct ti_sci_msg_rm_ring_cfg_req - Configure a Navigator Subsystem ring
  *

include/linux/soc/ti/ti_sci_protocol.h

@@ -292,6 +292,35 @@ struct ti_sci_rm_irq_ops {
 				      u8 vint_status_bit);
 };
 
+/**
+ * struct ti_sci_proc_ops - Processor Control operations
+ * @request:	Request to control a physical processor. The requesting host
+ *		should be in the processor access list
+ * @release:	Relinquish a physical processor control
+ * @handover:	Handover a physical processor control to another host
+ *		in the permitted list
+ * @set_config:	Set base configuration of a processor
+ * @set_control: Setup limited control flags in specific cases
+ * @get_status: Get the state of physical processor
+ *
+ * NOTE: The following paramteres are generic in nature for all these ops,
+ * -handle:	Pointer to TI SCI handle as retrieved by *ti_sci_get_handle
+ * -pid:	Processor ID
+ * -hid:	Host ID
+ */
+struct ti_sci_proc_ops {
+	int (*request)(const struct ti_sci_handle *handle, u8 pid);
+	int (*release)(const struct ti_sci_handle *handle, u8 pid);
+	int (*handover)(const struct ti_sci_handle *handle, u8 pid, u8 hid);
+	int (*set_config)(const struct ti_sci_handle *handle, u8 pid,
+			  u64 boot_vector, u32 cfg_set, u32 cfg_clr);
+	int (*set_control)(const struct ti_sci_handle *handle, u8 pid,
+			   u32 ctrl_set, u32 ctrl_clr);
+	int (*get_status)(const struct ti_sci_handle *handle, u8 pid,
+			  u64 *boot_vector, u32 *cfg_flags, u32 *ctrl_flags,
+			  u32 *status_flags);
+};
+
 /* RA config.addr_lo parameter is valid for RM ring configure TI_SCI message */
 #define TI_SCI_MSG_VALUE_RM_RING_ADDR_LO_VALID	BIT(0)
 /* RA config.addr_hi parameter is valid for RM ring configure TI_SCI message */
@@ -503,6 +532,7 @@ struct ti_sci_rm_udmap_ops {
  * @clk_ops:	Clock specific operations
  * @rm_core_ops:	Resource management core operations.
  * @rm_irq_ops:		IRQ management specific operations
+ * @proc_ops:	Processor Control specific operations
  */
 struct ti_sci_ops {
 	struct ti_sci_core_ops core_ops;
@@ -510,6 +540,7 @@ struct ti_sci_ops {
 	struct ti_sci_clk_ops clk_ops;
 	struct ti_sci_rm_core_ops rm_core_ops;
 	struct ti_sci_rm_irq_ops rm_irq_ops;
+	struct ti_sci_proc_ops proc_ops;
 	struct ti_sci_rm_ringacc_ops rm_ring_ops;
 	struct ti_sci_rm_psil_ops rm_psil_ops;
 	struct ti_sci_rm_udmap_ops rm_udmap_ops;