bus: mhi: core: Add support for ringing channel/event ring doorbells

This commit adds support for ringing channel and event ring doorbells by MHI host. The MHI host can use the channel and event ring doorbells for notifying the client device about processing transfer and event rings which it has queued using MMIO registers. This is based on the patch submitted by Sujeev Dias: https://lkml.org/lkml/2018/7/9/989

Manivannan Sadhasivam committed 6 years ago

Commit 6cd330a1 parent da1c4f84 files · +545 −0Browse files

Showing the changes to include/linux (1 of 4 files). Show all

Unified · Split

include/linux/mhi.h+4−0

@@ -240,6 +240,8 @@ struct mhi_controller_config { · 239 unmodified lines
240	240	* controller (required)
241	241	* @mhi_dev: MHI device instance for the controller
242	242	* @regs: Base address of MHI MMIO register space (required)
	243	+ * @bhi: Points to base of MHI BHI register space
	244	+ * @wake_db: MHI WAKE doorbell register address
243	245	* @iova_start: IOMMU starting address for data (required)
244	246	* @iova_stop: IOMMU stop address for data (required)
245	247	* @fw_image: Firmware image name for normal booting (required)
@@ -294,6 +296,8 @@ struct mhi_controller { · 48 unmodified lines
294	296	struct device *cntrl_dev;
295	297	struct mhi_device *mhi_dev;
296	298	void __iomem *regs;
	299	+ void __iomem *bhi;
	300	+ void __iomem *wake_db;
297	301	dma_addr_t iova_start;
298	302	dma_addr_t iova_stop;
299	303	const char *fw_image;