[PATCH v5 02/21] firmware: ti_sci: Add TI_SCI_MSG_MIN_CONTEXT_RESTORE

["Richard Genoud (TI)" <richard.genoud@bootlin.com>]

From: "Markus Schneider-Pargmann (TI)" <msp@baylibre.com>

This patch adds code to be able to call TI_SCI_MSG_MIN_CONTEXT_RESTORE.
The context needs to be restored after booting SPL when resuming from
IO+DDR.

Signed-off-by: Markus Schneider-Pargmann (TI) <msp@baylibre.com>
---
 drivers/firmware/ti_sci.c              | 38 ++++++++++++++++++++++++++
 drivers/firmware/ti_sci.h              | 16 +++++++++++
 include/linux/soc/ti/ti_sci_protocol.h |  9 ++++++
 3 files changed, 63 insertions(+)

diff --git a/drivers/firmware/ti_sci.c b/drivers/firmware/ti_sci.c
index 0f5e180e9e94..c015bd3cc245 100644
--- a/drivers/firmware/ti_sci.c
+++ b/drivers/firmware/ti_sci.c
@@ -2710,6 +2710,41 @@ static int ti_sci_cmd_change_fwl_owner(const struct ti_sci_handle *handle,
 	return ret;
 }
 
+static int ti_sci_cmd_min_context_restore(const struct ti_sci_handle *handle, u64 ctx_addr)
+{
+	struct ti_sci_msg_min_restore_context_req 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_MIN_CONTEXT_RESTORE,
+				     TI_SCI_FLAG_REQ_ACK_ON_PROCESSED,
+				     (u32 *)&req, sizeof(req), sizeof(*resp));
+	if (IS_ERR(xfer)) {
+		ret = PTR_ERR(xfer);
+		return ret;
+	}
+
+	req.ctx_lo = (u32)(ctx_addr & 0xffffffff);
+	req.ctx_hi = (u32)(ctx_addr >> 32);
+
+	ret = ti_sci_do_xfer(info, xfer);
+	if (ret) {
+		dev_err(info->dev, "Failed restoring context %d\n", ret);
+		return ret;
+	}
+
+	return ret;
+}
+
 /*
  * ti_sci_setup_ops() - Setup the operations structures
  * @info:	pointer to TISCI pointer
@@ -2728,6 +2763,7 @@ static void ti_sci_setup_ops(struct ti_sci_info *info)
 	struct ti_sci_rm_psil_ops *psilops = &ops->rm_psil_ops;
 	struct ti_sci_rm_udmap_ops *udmap_ops = &ops->rm_udmap_ops;
 	struct ti_sci_fwl_ops *fwl_ops = &ops->fwl_ops;
+	struct ti_sci_lpm_ops *lpm_ops = &ops->lpm_ops;
 
 	bops->board_config = ti_sci_cmd_set_board_config;
 	bops->board_config_rm = ti_sci_cmd_set_board_config_rm;
@@ -2795,6 +2831,8 @@ static void ti_sci_setup_ops(struct ti_sci_info *info)
 
 	fw_ops->get_dm_version = ti_sci_cmd_get_dm_version;
 	fw_ops->query_dm_cap = ti_sci_cmd_query_dm_cap;
+
+	lpm_ops->min_context_restore = ti_sci_cmd_min_context_restore;
 }
 
 /**
diff --git a/drivers/firmware/ti_sci.h b/drivers/firmware/ti_sci.h
index ce50bf6800eb..68908c6c8c46 100644
--- a/drivers/firmware/ti_sci.h
+++ b/drivers/firmware/ti_sci.h
@@ -45,6 +45,9 @@
 #define TI_SCI_MSG_QUERY_CLOCK_FREQ	0x010d
 #define TI_SCI_MSG_GET_CLOCK_FREQ	0x010e
 
+/* Low Power Mode Requests */
+#define TI_SCI_MSG_MIN_CONTEXT_RESTORE	0x0308
+
 /* Processor Control Messages */
 #define TISCI_MSG_PROC_REQUEST		0xc000
 #define TISCI_MSG_PROC_RELEASE		0xc001
@@ -1572,4 +1575,17 @@ struct ti_sci_msg_fwl_change_owner_info_resp {
 	u16			owner_permission_bits;
 } __packed;
 
+/**
+ * struct ti_sci_msg_min_restore_context_req - Request to restore context from DDR
+ *
+ * @hdr:		Generic Header
+ * @ctx_lo		Low 32-bits of physical pointer to address to use for context restore.
+ * @ctx_hi		High 32-bits of physical pointer to address to use for context restore.
+ */
+struct ti_sci_msg_min_restore_context_req {
+	struct ti_sci_msg_hdr	hdr;
+	u32			ctx_lo;
+	u32			ctx_hi;
+} __packed;
+
 #endif /* __TI_SCI_H */
diff --git a/include/linux/soc/ti/ti_sci_protocol.h b/include/linux/soc/ti/ti_sci_protocol.h
index 52696763ecf6..6b1dd801f5f8 100644
--- a/include/linux/soc/ti/ti_sci_protocol.h
+++ b/include/linux/soc/ti/ti_sci_protocol.h
@@ -632,6 +632,14 @@ struct ti_sci_fwl_ops {
 	int (*change_fwl_owner)(const struct ti_sci_handle *handle, struct ti_sci_msg_fwl_owner *owner);
 };
 
+/**
+ * struct ti_sci_lpm_ops - Low Power Mode operations
+ * @min_context_restore: Request restoring context from DDR.
+ */
+struct ti_sci_lpm_ops {
+	int (*min_context_restore)(const struct ti_sci_handle *handle, u64 ctx_addr);
+};
+
 /**
  * struct ti_sci_ops - Function support for TI SCI
  * @board_ops:	Miscellaneous operations
@@ -654,6 +662,7 @@ struct ti_sci_ops {
 	struct ti_sci_rm_psil_ops rm_psil_ops;
 	struct ti_sci_rm_udmap_ops rm_udmap_ops;
 	struct ti_sci_fwl_ops fwl_ops;
+	struct ti_sci_lpm_ops lpm_ops;
 };
 
 /**