From: Andreas Dannenberg <dannenb...@ti.com>
Since system controller now has control over SoC power management, it
needs to be explicitly requested to reboot the SoC. Add support for
it.
Signed-off-by: Lokesh Vutla <lokeshvu...@ti.com>
Signed-off-by: Nishanth Menon <n...@ti.com>
---
drivers/firmware/ti_sci.c | 47 ++++++++++++++++++++++++++
drivers/firmware/ti_sci.h | 11 ++++++
include/linux/soc/ti/ti_sci_protocol.h | 12 +++++++
3 files changed, 70 insertions(+)
diff --git a/drivers/firmware/ti_sci.c b/drivers/firmware/ti_sci.c
index af7c5c7ee9..e04bae2ef4 100644
--- a/drivers/firmware/ti_sci.c
+++ b/drivers/firmware/ti_sci.c
@@ -1397,6 +1397,50 @@ static int ti_sci_cmd_clk_get_freq(const struct
ti_sci_handle *handle,
return ret;
}
+/**
+ * ti_sci_cmd_core_reboot() - Command to request system reset
+ * @handle: pointer to TI SCI handle
+ *
+ * Return: 0 if all went well, else returns appropriate error value.
+ */
+static int ti_sci_cmd_core_reboot(const struct ti_sci_handle *handle)
+{
+ struct ti_sci_msg_req_reboot req;
+ struct ti_sci_msg_hdr *resp;
+ 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_SYS_RESET,
+ TI_SCI_FLAG_REQ_ACK_ON_PROCESSED,
+ (u32 *)&req, sizeof(req), sizeof(*resp));
+ if (IS_ERR(xfer)) {
+ ret = PTR_ERR(xfer);
+ dev_err(info->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);
+ return ret;
+ }
+
+ resp = (struct ti_sci_msg_hdr *)xfer->tx_message.buf;
+
+ if (!ti_sci_is_response_ack(resp))
+ return -ENODEV;
+
+ return ret;
+}
+
/*
* ti_sci_setup_ops() - Setup the operations structures
* @info: pointer to TISCI pointer
@@ -1407,6 +1451,7 @@ static void ti_sci_setup_ops(struct ti_sci_info *info)
struct ti_sci_board_ops *bops = &ops->board_ops;
struct ti_sci_dev_ops *dops = &ops->dev_ops;
struct ti_sci_clk_ops *cops = &ops->clk_ops;
+ struct ti_sci_core_ops *core_ops = &ops->core_ops;
bops->board_config = ti_sci_cmd_set_board_config;
bops->board_config_rm = ti_sci_cmd_set_board_config_rm;
@@ -1439,6 +1484,8 @@ static void ti_sci_setup_ops(struct ti_sci_info *info)
cops->get_best_match_freq = ti_sci_cmd_clk_get_match_freq;
cops->set_freq = ti_sci_cmd_clk_set_freq;
cops->get_freq = ti_sci_cmd_clk_get_freq;
+
+ core_ops->reboot_device = ti_sci_cmd_core_reboot;
}
/**
diff --git a/drivers/firmware/ti_sci.h b/drivers/firmware/ti_sci.h
index 7b7c7e7530..714a066985 100644
--- a/drivers/firmware/ti_sci.h
+++ b/drivers/firmware/ti_sci.h
@@ -95,6 +95,17 @@ struct ti_sci_msg_resp_version {
u8 abi_minor;
} __packed;
+/**
+ * struct ti_sci_msg_req_reboot - Reboot the SoC
+ * @hdr: Generic Header
+ *
+ * Request type is TI_SCI_MSG_SYS_RESET, responded with a generic
+ * ACK/NACK message.
+ */
+struct ti_sci_msg_req_reboot {
+ struct ti_sci_msg_hdr hdr;
+} __packed;
+
/**
* struct ti_sci_msg_board_config - Board configuration message
* @hdr: Generic Header
diff --git a/include/linux/soc/ti/ti_sci_protocol.h
b/include/linux/soc/ti/ti_sci_protocol.h
index cec1c1a2bd..e3ce993fa3 100644
--- a/include/linux/soc/ti/ti_sci_protocol.h
+++ b/include/linux/soc/ti/ti_sci_protocol.h
@@ -213,16 +213,28 @@ struct ti_sci_clk_ops {
u64 *current_freq);
};
+/**
+ * struct ti_sci_core_ops - SoC Core Operations
+ * @reboot_device: Reboot the SoC
+ * Returns 0 for successful request(ideally should never return),
+ * else returns corresponding error value.
+ */
+struct ti_sci_core_ops {
+ int (*reboot_device)(const struct ti_sci_handle *handle);
+};
+
/**
* struct ti_sci_ops - Function support for TI SCI
* @board_ops: Miscellaneous operations
* @dev_ops: Device specific operations
* @clk_ops: Clock specific operations
+ * @core_ops: Core specific operations
*/
struct ti_sci_ops {
struct ti_sci_board_ops board_ops;
struct ti_sci_dev_ops dev_ops;
struct ti_sci_clk_ops clk_ops;
+ struct ti_sci_core_ops core_ops;
};
/**
--
2.18.0
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