[U-Boot] [PATCH 2/8] firmware: ti_sci: Add processor shutdown API method
Lokesh Vutla
lokeshvutla at ti.com
Wed May 22 04:27:07 UTC 2019
From: Andreas Dannenberg <dannenberg at ti.com>
Add and expose a new processor shutdown API that wraps the two TISCI
messages involved in initiating a core shutdown. The API will first
queue a message to have the DMSC wait for a certain processor boot
status to happen followed by a message to trigger the actual shutdown-
with both messages being sent without waiting or requesting for a
response. Note that the processor shutdown API call will need to be
followed up by user software placing the respective core into either
WFE or WFI mode.
Signed-off-by: Andreas Dannenberg <dannenberg at ti.com>
---
drivers/firmware/ti_sci.c | 191 ++++++++++++++++++++++++-
drivers/firmware/ti_sci.h | 50 +++++++
include/linux/soc/ti/ti_sci_protocol.h | 4 +
3 files changed, 241 insertions(+), 4 deletions(-)
diff --git a/drivers/firmware/ti_sci.c b/drivers/firmware/ti_sci.c
index eadb91e107..8c68f98788 100644
--- a/drivers/firmware/ti_sci.c
+++ b/drivers/firmware/ti_sci.c
@@ -101,7 +101,8 @@ struct ti_sci_info {
* @msg_flags: Flag to set for the message
* @buf: Buffer to be send to mailbox channel
* @tx_message_size: transmit message size
- * @rx_message_size: receive message size
+ * @rx_message_size: receive message size. may be set to zero for send-only
+ * transactions.
*
* Helper function which is used by various command functions that are
* exposed to clients of this driver for allocating a message traffic event.
@@ -121,7 +122,8 @@ static struct ti_sci_xfer *ti_sci_setup_one_xfer(struct ti_sci_info *info,
/* Ensure we have sane transfer sizes */
if (rx_message_size > info->desc->max_msg_size ||
tx_message_size > info->desc->max_msg_size ||
- rx_message_size < sizeof(*hdr) || tx_message_size < sizeof(*hdr))
+ (rx_message_size > 0 && rx_message_size < sizeof(*hdr)) ||
+ tx_message_size < sizeof(*hdr))
return ERR_PTR(-ERANGE);
info->seq = ~info->seq;
@@ -219,7 +221,9 @@ static inline int ti_sci_do_xfer(struct ti_sci_info *info,
xfer->tx_message.buf = (u32 *)secure_buf;
xfer->tx_message.len += sizeof(secure_hdr);
- xfer->rx_len += sizeof(secure_hdr);
+
+ if (xfer->rx_len)
+ xfer->rx_len += sizeof(secure_hdr);
}
/* Send the message */
@@ -230,7 +234,11 @@ static inline int ti_sci_do_xfer(struct ti_sci_info *info,
return ret;
}
- return ti_sci_get_response(info, xfer, &info->chan_rx);
+ /* Get response if requested */
+ if (xfer->rx_len)
+ ret = ti_sci_get_response(info, xfer, &info->chan_rx);
+
+ return ret;
}
/**
@@ -469,6 +477,49 @@ static int ti_sci_set_device_state(const struct ti_sci_handle *handle,
return ret;
}
+/**
+ * ti_sci_set_device_state_no_wait() - Set device state helper without
+ * requesting or waiting for a response.
+ * @handle: pointer to TI SCI handle
+ * @id: Device identifier
+ * @flags: flags to setup for the device
+ * @state: State to move the device to
+ *
+ * Return: 0 if all went well, else returns appropriate error value.
+ */
+static int ti_sci_set_device_state_no_wait(const struct ti_sci_handle *handle,
+ u32 id, u32 flags, u8 state)
+{
+ struct ti_sci_msg_req_set_device_state req;
+ struct ti_sci_info *info;
+ struct ti_sci_xfer *xfer;
+ int ret = 0;
+
+ if (IS_ERR(handle))
+ return PTR_ERR(handle);
+ if (!handle)
+ return -EINVAL;
+
+ info = handle_to_ti_sci_info(handle);
+
+ xfer = ti_sci_setup_one_xfer(info, TI_SCI_MSG_SET_DEVICE_STATE,
+ flags | TI_SCI_FLAG_REQ_GENERIC_NORESPONSE,
+ (u32 *)&req, sizeof(req), 0);
+ if (IS_ERR(xfer)) {
+ ret = PTR_ERR(xfer);
+ dev_err(info->dev, "Message alloc failed(%d)\n", ret);
+ return ret;
+ }
+ req.id = id;
+ req.state = state;
+
+ ret = ti_sci_do_xfer(info, xfer);
+ if (ret)
+ dev_err(info->dev, "Mbox send fail %d\n", ret);
+
+ return ret;
+}
+
/**
* ti_sci_get_device_state() - Get device state helper
* @handle: Handle to the device
@@ -2039,6 +2090,137 @@ static int ti_sci_cmd_get_proc_boot_status(const struct ti_sci_handle *handle,
return ret;
}
+/**
+ * ti_sci_proc_wait_boot_status_no_wait() - Helper function to wait for a
+ * processor boot status without requesting or
+ * waiting for a response.
+ * @proc_id: Processor ID this request is for
+ * @num_wait_iterations: Total number of iterations we will check before
+ * we will timeout and give up
+ * @num_match_iterations: How many iterations should we have continued
+ * status to account for status bits glitching.
+ * This is to make sure that match occurs for
+ * consecutive checks. This implies that the
+ * worst case should consider that the stable
+ * time should at the worst be num_wait_iterations
+ * num_match_iterations to prevent timeout.
+ * @delay_per_iteration_us: Specifies how long to wait (in micro seconds)
+ * between each status checks. This is the minimum
+ * duration, and overhead of register reads and
+ * checks are on top of this and can vary based on
+ * varied conditions.
+ * @delay_before_iterations_us: Specifies how long to wait (in micro seconds)
+ * before the very first check in the first
+ * iteration of status check loop. This is the
+ * minimum duration, and overhead of register
+ * reads and checks are.
+ * @status_flags_1_set_all_wait:If non-zero, Specifies that all bits of the
+ * status matching this field requested MUST be 1.
+ * @status_flags_1_set_any_wait:If non-zero, Specifies that at least one of the
+ * bits matching this field requested MUST be 1.
+ * @status_flags_1_clr_all_wait:If non-zero, Specifies that all bits of the
+ * status matching this field requested MUST be 0.
+ * @status_flags_1_clr_any_wait:If non-zero, Specifies that at least one of the
+ * bits matching this field requested MUST be 0.
+ *
+ * Return: 0 if all goes well, else appropriate error message
+ */
+static int
+ti_sci_proc_wait_boot_status_no_wait(const struct ti_sci_handle *handle,
+ u8 proc_id,
+ u8 num_wait_iterations,
+ u8 num_match_iterations,
+ u8 delay_per_iteration_us,
+ u8 delay_before_iterations_us,
+ u32 status_flags_1_set_all_wait,
+ u32 status_flags_1_set_any_wait,
+ u32 status_flags_1_clr_all_wait,
+ u32 status_flags_1_clr_any_wait)
+{
+ struct ti_sci_msg_req_wait_proc_boot_status req;
+ struct ti_sci_info *info;
+ struct ti_sci_xfer *xfer;
+ int ret = 0;
+
+ if (IS_ERR(handle))
+ return PTR_ERR(handle);
+ if (!handle)
+ return -EINVAL;
+
+ info = handle_to_ti_sci_info(handle);
+
+ xfer = ti_sci_setup_one_xfer(info, TISCI_MSG_WAIT_PROC_BOOT_STATUS,
+ TI_SCI_FLAG_REQ_GENERIC_NORESPONSE,
+ (u32 *)&req, sizeof(req), 0);
+ if (IS_ERR(xfer)) {
+ ret = PTR_ERR(xfer);
+ dev_err(info->dev, "Message alloc failed(%d)\n", ret);
+ return ret;
+ }
+ req.processor_id = proc_id;
+ req.num_wait_iterations = num_wait_iterations;
+ req.num_match_iterations = num_match_iterations;
+ req.delay_per_iteration_us = delay_per_iteration_us;
+ req.delay_before_iterations_us = delay_before_iterations_us;
+ req.status_flags_1_set_all_wait = status_flags_1_set_all_wait;
+ req.status_flags_1_set_any_wait = status_flags_1_set_any_wait;
+ req.status_flags_1_clr_all_wait = status_flags_1_clr_all_wait;
+ req.status_flags_1_clr_any_wait = status_flags_1_clr_any_wait;
+
+ ret = ti_sci_do_xfer(info, xfer);
+ if (ret)
+ dev_err(info->dev, "Mbox send fail %d\n", ret);
+
+ return ret;
+}
+
+/**
+ * ti_sci_cmd_proc_shutdown_no_wait() - Command to shutdown a core without
+ * requesting or waiting for a response. Note that this API call
+ * should be followed by placing the respective processor into
+ * either WFE or WFI mode.
+ * @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_shutdown_no_wait(const struct ti_sci_handle *handle,
+ u8 proc_id)
+{
+ int ret;
+
+ /*
+ * Send the core boot status wait message waiting for either WFE or
+ * WFI without requesting or waiting for a TISCI response with the
+ * maximum wait time to give us the best chance to get to the WFE/WFI
+ * command that should follow the invocation of this API before the
+ * DMSC-internal processing of this command times out. Note that
+ * waiting for the R5 WFE/WFI flags will also work on an ARMV8 type
+ * core as the related flag bit positions are the same.
+ */
+ ret = ti_sci_proc_wait_boot_status_no_wait(handle, proc_id,
+ U8_MAX, 100, U8_MAX, U8_MAX,
+ 0, PROC_BOOT_STATUS_FLAG_R5_WFE | PROC_BOOT_STATUS_FLAG_R5_WFI,
+ 0, 0);
+ if (ret) {
+ dev_err(info->dev, "Sending core %u wait message fail %d\n",
+ proc_id, ret);
+ return ret;
+ }
+
+ /*
+ * Release a processor managed by TISCI without requesting or waiting
+ * for a response.
+ */
+ ret = ti_sci_set_device_state_no_wait(handle, proc_id, 0,
+ MSG_DEVICE_SW_STATE_AUTO_OFF);
+ if (ret)
+ dev_err(info->dev, "Sending core %u shutdown message fail %d\n",
+ proc_id, ret);
+
+ return ret;
+}
+
/**
* ti_sci_cmd_ring_config() - configure RA ring
* @handle: pointer to TI SCI handle
@@ -2687,6 +2869,7 @@ static void ti_sci_setup_ops(struct ti_sci_info *info)
pops->set_proc_boot_ctrl = ti_sci_cmd_set_proc_boot_ctrl;
pops->proc_auth_boot_image = ti_sci_cmd_proc_auth_boot_image;
pops->get_proc_boot_status = ti_sci_cmd_get_proc_boot_status;
+ pops->proc_shutdown_no_wait = ti_sci_cmd_proc_shutdown_no_wait;
rops->config = ti_sci_cmd_ring_config;
rops->get_config = ti_sci_cmd_ring_get_config;
diff --git a/drivers/firmware/ti_sci.h b/drivers/firmware/ti_sci.h
index a484b1fa40..69ff74d6a9 100644
--- a/drivers/firmware/ti_sci.h
+++ b/drivers/firmware/ti_sci.h
@@ -50,6 +50,7 @@
#define TISCI_MSG_SET_PROC_BOOT_CTRL 0xc101
#define TISCI_MSG_PROC_AUTH_BOOT_IMIAGE 0xc120
#define TISCI_MSG_GET_PROC_BOOT_STATUS 0xc400
+#define TISCI_MSG_WAIT_PROC_BOOT_STATUS 0xc401
/* Resource Management Requests */
#define TI_SCI_MSG_GET_RESOURCE_RANGE 0x1500
@@ -772,6 +773,55 @@ struct ti_sci_msg_resp_get_proc_boot_status {
u32 status_flags;
} __packed;
+/**
+ * struct ti_sci_msg_req_wait_proc_boot_status - Wait for a processor
+ * boot status
+ * @hdr: Generic Header
+ * @processor_id: ID of processor
+ * @num_wait_iterations: Total number of iterations we will check before
+ * we will timeout and give up
+ * @num_match_iterations: How many iterations should we have continued
+ * status to account for status bits glitching.
+ * This is to make sure that match occurs for
+ * consecutive checks. This implies that the
+ * worst case should consider that the stable
+ * time should at the worst be num_wait_iterations
+ * num_match_iterations to prevent timeout.
+ * @delay_per_iteration_us: Specifies how long to wait (in micro seconds)
+ * between each status checks. This is the minimum
+ * duration, and overhead of register reads and
+ * checks are on top of this and can vary based on
+ * varied conditions.
+ * @delay_before_iterations_us: Specifies how long to wait (in micro seconds)
+ * before the very first check in the first
+ * iteration of status check loop. This is the
+ * minimum duration, and overhead of register
+ * reads and checks are.
+ * @status_flags_1_set_all_wait:If non-zero, Specifies that all bits of the
+ * status matching this field requested MUST be 1.
+ * @status_flags_1_set_any_wait:If non-zero, Specifies that at least one of the
+ * bits matching this field requested MUST be 1.
+ * @status_flags_1_clr_all_wait:If non-zero, Specifies that all bits of the
+ * status matching this field requested MUST be 0.
+ * @status_flags_1_clr_any_wait:If non-zero, Specifies that at least one of the
+ * bits matching this field requested MUST be 0.
+ *
+ * Request type is TISCI_MSG_WAIT_PROC_BOOT_STATUS, response is appropriate
+ * message, or NACK in case of inability to satisfy request.
+ */
+struct ti_sci_msg_req_wait_proc_boot_status {
+ struct ti_sci_msg_hdr hdr;
+ u8 processor_id;
+ u8 num_wait_iterations;
+ u8 num_match_iterations;
+ u8 delay_per_iteration_us;
+ u8 delay_before_iterations_us;
+ u32 status_flags_1_set_all_wait;
+ u32 status_flags_1_set_any_wait;
+ u32 status_flags_1_clr_all_wait;
+ u32 status_flags_1_clr_any_wait;
+} __packed;
+
/**
* struct ti_sci_msg_rm_ring_cfg_req - Configure a Navigator Subsystem ring
*
diff --git a/include/linux/soc/ti/ti_sci_protocol.h b/include/linux/soc/ti/ti_sci_protocol.h
index 842fb596f7..cd6e5853b4 100644
--- a/include/linux/soc/ti/ti_sci_protocol.h
+++ b/include/linux/soc/ti/ti_sci_protocol.h
@@ -266,6 +266,8 @@ struct ti_sci_core_ops {
* @set_proc_boot_ctrl: Setup limited control flags in specific cases.
* @proc_auth_boot_image:
* @get_proc_boot_status: Get the state of physical processor
+ * @proc_shutdown_no_wait: Shutdown a core without requesting or waiting for a
+ * response.
*
* NOTE: for all these functions, the following parameters are generic in
* nature:
@@ -287,6 +289,8 @@ struct ti_sci_proc_ops {
int (*get_proc_boot_status)(const struct ti_sci_handle *handle, u8 pid,
u64 *bv, u32 *cfg_flags, u32 *ctrl_flags,
u32 *sts_flags);
+ int (*proc_shutdown_no_wait)(const struct ti_sci_handle *handle,
+ u8 pid);
};
#define TI_SCI_RING_MODE_RING (0)
--
2.17.1
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