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Commit 14fcb5c1 authored by Andrei Danaila's avatar Andrei Danaila Committed by Matt Wagantall
Browse files

msm: mhi: Add MHI core driver 



Enable the MHI core driver for communication
between host and device using PCIe as an interconnect
and supporting MHI as the communication protocol.

The driver exposes several kernel space APIs
for use by other kernel entities to interface to
the PCIe device over MHI.

APIs for read and write and other notifications
are supported by this MHI driver.

Support for full power management and device reset
is also included.

CRs-Fixed: 689329
Change-Id: Ibc2fd7c2d5689001485f71b1133ada2c4ca236a9
Signed-off-by: default avatarAndrei Danaila <adanaila@codeaurora.org>
parent 6759c3c1

Documentation/devicetree/bindings/mhi/msm_mhi.txt

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MSM MHI



MSM MHI enables communication with a device over a PCIe link using the

Modem Host Interface protocol. The bindings referred to below, enable

the correct configuration of the interface and required sideband

signals.



Required properties:

  - compatible: should be "qcom,mhi"

  - Refer to "Documentation/devicetree/bindings/esoc/esoc_client.txt" for

    below properties:

	- esoc-names

	- esoc-0

  - wakeup-gpios: gpio used to wake device from low power mode.

  - Refer to "Documentation/devicetree/bindings/arm/msm/msm_bus.txt" for

    below optional properties:

	- qcom,msm-bus,name

	- qcom,msm-bus,num-cases

	- qcom,msm-bus,num-paths

	- qcom,msm-bus,vectors-KBps



Example:



	mhi: qcom,mhi {

		compatible = "qcom,mhi";

		esoc-names = "mdm";

		esoc-0 = <&mdm1>;

		mhi-device-wake-gpio =

			<&msmgpio 108 0>;

		qcom,msm-bus,name = "mhi";

		qcom,msm-bus,num-cases = <2>;

		qcom,msm-bus,num-paths = <1>;

		qcom,msm-bus,vectors-KBps =

				<100 512 0 0>,

				<100 512 1200000000 1200000000>;

	};

arch/arm/boot/dts/qcom/msm8996.dtsi

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@@ -1738,6 +1738,10 @@ 
					 <0>, <0>, <0>, <0>, <0>, <0>, <0>;

	};



	mhi: qcom,mhi {

		compatible = "qcom,mhi";

	};



        qcom,ipc-spinlock@740000 {

                compatible = "qcom,ipc-spinlock-sfpb";

                reg = <0x740000 0x8000>;

drivers/platform/msm/Kconfig

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@@ -118,6 +118,15 @@ config RMNET_IPA 
	  for RmNet Data Driver and also exchange of QMI messages between

	  A7 and Q6 IPA-driver.



config MSM_MHI

	tristate "Modem Host Interface Driver"

	help

	  This kernel module is used to interact with PCIe endpoints

	  supporting MHI protocol. MHI is a data transmission protocol

	  involving communication between a host and a device over shared

	  memory. The MHI driver manages the shared memory by use of logical

	  unidirectional channels.



config MSM_MHI_UCI

	 tristate "MHI Usperspace Control Interface Driver"

	 depends on MSM_MHI

drivers/platform/msm/Makefile

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@@ -4,6 +4,7 @@ 


obj-$(CONFIG_MSM_BUS_SCALING) += msm_bus/

obj-$(CONFIG_MSM_SPMI) += spmi/

obj-$(CONFIG_MSM_MHI) += mhi/

obj-$(CONFIG_MSM_MHI_UCI) += mhi_uci/

obj-$(CONFIG_QPNP_POWER_ON) += qpnp-power-on.o

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

drivers/platform/msm/mhi/Makefile

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# Makefile for MHI driver

obj-y += mhi_main.o

obj-y += mhi_iface.o

obj-y += mhi_init.o

obj-y += mhi_isr.o

obj-y += mhi_mmio_ops.o

obj-y += mhi_ring_ops.o

obj-y += mhi_states.o

obj-y += mhi_sys.o

obj-y += mhi_bhi.o

obj-y += mhi_pm.o

obj-y += mhi_ssr.o