[PATCH linux v5 0/7] Introducing the FSI device driver
christopher.lee.bostic at gmail.com
christopher.lee.bostic at gmail.com
Thu Aug 25 05:54:05 AEST 2016
From: Chris Bostic <cbostic at us.ibm.com>
Introduction of the IBM 'Flexible Support Interface' (FSI) bus device
driver. FSI is a high fan out serial bus consisting of a clock and a serial
data line capable of running at speeds up to 166 MHz.
This set provides the core functionality of the FSI device driver. Core
function is defined as:
* FSI client registration and notification of bus state changes
* Device scanning and hotplug reporting to clients
* Interrupt detection and routing
* Bus error detection and cleanup
This patch set does not include extended FSI function such as:
* Hub master support
* Cascaded master support
* Application layer hot plug notification
* Application layer FSI bus status interface
* Host configuration allowing for various hardware / firmware
emulation implementations of the FSI master.
* Soft FSI support. Soft FSI is a device driver method of emulating
FSI master hardware by 'bit banging' standard I/O lines.
Common FSI terminology:
Controller of the FSI bus. Only the master is allowed to control the
clock line and is the initiator of all transactions on a bus.
The receiver or target of a master initiated transaction. The slave
cannot initiate communications on a bus and must respond to any
master requests for data.
Stands for Common Field replaceable unit Access Macro. A CFAM is an
ASIC residing in any device requiring FSI communications. CFAMs
consist of an array of hardware 'engines' used for various purposes.
I2C masters, UARTs, General Purpose IO hardware are common types of
* Configuration Space / Table
A table contained at the beginning of each CFAM address space.
This table lists information such as the CFAM's ID, which engine types
and versions it has available, as well as its addressing range.
The combination of a serial clock and data line constituting one
FSI communications element. For each link there is a master on one
end and a CFAM/slave on the other end.
A self contained hardware function found within a CFAM. Examples
include I2C masters, UARTs, GPIOs, etc...
A device driver requiring access to its hardware via an FSI bus.
For example an I2C client would be a device driver requiring
access to an I2C master engine on a remote CFAM accessible via
an FSI link. Clients register with the FSI bus and will receive
notifications of bus state changes as well as hot plug events related
to engines of interest to them.
* Build Up
The process scanning a bus and creating a data structure representation
of all devices discovered in a tree. A tree in this context is a
series of links and devices connected to those links.
* Hub / Hub master
Provides extension to the existing primary FSI master. Allows for
several chained FSI links in series to a target device thus increasing
potential fan out.
* Cascaded master
A subset of functionality of the hub master. Cascaded masters can
access only a limited address range compared to hub masters. This was
the first generation implementation, essentially, of hub type function.
Chris Bostic (6):
drivers/fsi: Add FSI Master Functionality and Initialization
drivers/fsi: Add FSI master target device scanning function
drivers/fsi: Add initial FSI link buildup
drivers/fsi: Add FSI bus type and hook into LDM
drivers/fsi: Add FSI Bus Support for Clients
drivers/fsi: Add CFAM scanning function
Christopher Bostic (1):
drivers/fsi: Initial stubs for FSI device driver.
drivers/Kconfig | 2 +
drivers/Makefile | 1 +
drivers/fsi/Kconfig | 7 +
drivers/fsi/Makefile | 5 +
drivers/fsi/build.c | 876 ++++++++++++++++++++++++++++++++++++++++++++++
drivers/fsi/fsi.h | 134 +++++++
drivers/fsi/fsi_private.h | 123 +++++++
drivers/fsi/fsicfam.h | 161 +++++++++
drivers/fsi/fsiinit.c | 92 +++++
drivers/fsi/fsiinit.h | 43 +++
drivers/fsi/fsilink.h | 99 ++++++
drivers/fsi/fsimaster.c | 619 ++++++++++++++++++++++++++++++++
drivers/fsi/fsimaster.h | 682 ++++++++++++++++++++++++++++++++++++
drivers/fsi/fsislave.h | 415 ++++++++++++++++++++++
drivers/fsi/ldm.c | 347 ++++++++++++++++++
drivers/fsi/readwrite.c | 123 +++++++
16 files changed, 3729 insertions(+)
create mode 100644 drivers/fsi/Kconfig
create mode 100644 drivers/fsi/Makefile
create mode 100644 drivers/fsi/build.c
create mode 100644 drivers/fsi/fsi.h
create mode 100644 drivers/fsi/fsi_private.h
create mode 100644 drivers/fsi/fsicfam.h
create mode 100644 drivers/fsi/fsiinit.c
create mode 100644 drivers/fsi/fsiinit.h
create mode 100644 drivers/fsi/fsilink.h
create mode 100644 drivers/fsi/fsimaster.c
create mode 100644 drivers/fsi/fsimaster.h
create mode 100644 drivers/fsi/fsislave.h
create mode 100644 drivers/fsi/ldm.c
create mode 100644 drivers/fsi/readwrite.c
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