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Commit 603f765d authored by Siddartha Mohanadoss's avatar Siddartha Mohanadoss
Browse files

msm: mhi_dev: Add MHI device driver snapshot 



Modem host interface (MHI) device driver is
used to communicate between host and device
over PCIe.

This snapshot is taken as of msm-4.4
'commit <4f1f60e00d6a> ("Merge "ARM: dts:
msm: add nt35597 sharp panel node for sdm660"")'.

Change-Id: I7a396218003b7efadbdccf158ecf036dfb5ce845
Signed-off-by: default avatarSiddartha Mohanadoss <smohanad@codeaurora.org>
parent 3ea5d576

Documentation/devicetree/bindings/mhi/msm_mhi_dev.txt

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MSM MHI DEV



MSM MHI DEV enables communication with the host over a PCIe link using the

Modem Host Interface protocol. The driver interfaces with the IPA for

enabling the HW acceleration channel path and provides interface for

software channels to communicate between Host and device.



Required properties:

  - compatible: should be "qcom,msm-mhi-dev" for MHI device driver.

  - reg: MHI MMIO physical register space.

  - reg-names: resource names used for the MHI MMIO physical address region,

	       IPA uC command and event ring doorbell mail box address.

	       Should be "mhi_mmio_base" for MHI MMIO physical address,

	       "ipa_uc_mbox_crdb" for IPA uC Command Ring doorbell,

	       "ipa_uc_mbox_erdb" for IPA uC Event Ring doorbell passed to

	       the IPA driver.

  - qcom,mhi-ifc-id: ID of HW interface via which MHI on device side

		communicates with host side.

  - qcom,mhi-ep-msi: End point MSI number.

  - qcom,mhi-version: MHI specification version supported by the device.



Example:



	mhi: qcom,msm-mhi-dev {

		compatible = "qcom,msm-mhi-dev";

		reg = <0xfc527000 0x1000>,

		     <0xfd4fa000 0x1>,

		     <0xfd4fa080 0x1>;

		reg-names = "mhi_mmio_base", "ipa_uc_mbox_crdb",

			    "ipa_uc_mbox_erdb";

		qcom,mhi-ifc-id = <0x030017cb>;

		qcom,mhi-ep-msi = <1>;

		qcom,mhi-version = <0x1000000>;

	};

drivers/platform/msm/Kconfig

+9 −0
Original line number Diff line number Diff line
@@ -113,4 +113,13 @@ config QPNP_REVID 
	  numbers in the kernel log along with the PMIC option status. The PMIC

	  type is mapped to a QTI chip part number and logged as well.



config MSM_MHI_DEV

        tristate "Modem Device Interface Driver"

	depends on EP_PCIE && IPA

        help

          This kernel module is used to interact with PCIe Root complex

          supporting MHI protocol. MHI is a data transmission protocol

          involving communication between a host and a device over shared

          memory. MHI interacts with the IPA for supporting transfers

	  on the HW accelerated channels between Host and device.

endmenu

drivers/platform/msm/Makefile

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@@ -5,7 +5,6 @@ obj-$(CONFIG_GSI) += gsi/ 
obj-$(CONFIG_IPA) += ipa/

obj-$(CONFIG_IPA3) += ipa/

obj-$(CONFIG_SPS) += sps/



obj-$(CONFIG_QPNP_COINCELL) += qpnp-coincell.o

obj-$(CONFIG_QPNP_REVID) += qpnp-revid.o

obj-$(CONFIG_MSM_MHI_DEV) += mhi_dev/

drivers/platform/msm/mhi_dev/Makefile

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# Makefile for MHI driver

obj-y += mhi_mmio.o

obj-y += mhi.o

obj-y += mhi_ring.o

obj-y += mhi_uci.o

obj-y += mhi_sm.o

drivers/platform/msm/mhi_dev/mhi.c

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File added.

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