mhi: core: add support for MHI to operate on slave mode

MHI host is not always the bus master. Add support to
operate on slave mode.

CRs-Fixed: 1095436
Change-Id: I4af92c8171cf9ba38267afa753cec33f291d55eb
Signed-off-by: Sujeev Dias <sdias@codeaurora.org>

1 files changed, 56 insertions, 5 deletions

diff --git a/include/linux/msm_mhi.h b/include/linux/msm_mhi.h
index d5325e038e07..b9fd610f92da 100644
--- a/include/linux/msm_mhi.h
+++ b/include/linux/msm_mhi.h
@@ -18,6 +18,7 @@
 #define MHI_MAX_MTU        0xFFFF
 
 struct mhi_client_config;
+struct mhi_device_ctxt;
 
 enum MHI_CLIENT_CHANNEL {
 	MHI_CLIENT_LOOPBACK_OUT = 0,
@@ -71,11 +72,11 @@ enum MHI_CLIENT_CHANNEL {
 };
 
 enum MHI_CB_REASON {
-	MHI_CB_XFER = 0x0,
-	MHI_CB_MHI_DISABLED = 0x4,
-	MHI_CB_MHI_ENABLED = 0x8,
-	MHI_CB_CHAN_RESET_COMPLETE = 0x10,
-	MHI_CB_reserved = 0x80000000,
+	MHI_CB_XFER,
+	MHI_CB_MHI_DISABLED,
+	MHI_CB_MHI_ENABLED,
+	MHI_CB_MHI_SHUTDOWN,
+	MHI_CB_SYS_ERROR,
 };
 
 enum MHI_FLAGS {
@@ -123,6 +124,35 @@ struct __packed bhi_vec_entry {
 };
 
 /**
+ * struct mhi_device - IO resources for MHI
+ * @dev: device node points to of_node
+ * @pdev: pci device node
+ * @resource: bar memory space and IRQ resources
+ * @pm_runtime_get: fp for bus masters rpm pm_runtime_get
+ * @pm_runtime_noidle: fp for bus masters rpm pm_runtime_noidle
+ * @mhi_dev_ctxt: private data for host
+ */
+struct mhi_device {
+	struct device *dev;
+	struct pci_dev *pci_dev;
+	struct resource resources[2];
+	int (*pm_runtime_get)(struct pci_dev *pci_dev);
+	void (*pm_runtime_noidle)(struct pci_dev *pci_dev);
+	struct mhi_device_ctxt *mhi_dev_ctxt;
+};
+
+enum mhi_dev_ctrl {
+	MHI_DEV_CTRL_INIT,
+	MHI_DEV_CTRL_DE_INIT,
+	MHI_DEV_CTRL_SUSPEND,
+	MHI_DEV_CTRL_RESUME,
+	MHI_DEV_CTRL_POWER_OFF,
+	MHI_DEV_CTRL_POWER_ON,
+	MHI_DEV_CTRL_RAM_DUMP,
+	MHI_DEV_CTRL_NOTIFY_LINK_ERROR,
+};
+
+/**
  * mhi_is_device_ready - Check if MHI is ready to register clients
  *
  * @dev: device node that points to DT node
@@ -134,6 +164,27 @@ bool mhi_is_device_ready(const struct device * const dev,
 			 const char *node_name);
 
 /**
+ * mhi_resgister_device - register hardware resources with MHI
+ *
+ * @mhi_device: resources to be used
+ * @node_name: DT node name
+ * @userdata: cb data for client
+ * @Return 0 on success
+ */
+int mhi_register_device(struct mhi_device *mhi_device,
+			const char *node_name,
+			unsigned long user_data);
+
+/**
+ * mhi_pm_control_device - power management control api
+ * @mhi_device: registered device structure
+ * @ctrl: specific command
+ * @Return 0 on success
+ */
+int mhi_pm_control_device(struct mhi_device *mhi_device,
+			  enum mhi_dev_ctrl ctrl);
+
+/**
  * mhi_deregister_channel - de-register callbacks from MHI
  *
  * @client_handle: Handle populated by MHI, opaque to client