summaryrefslogtreecommitdiff
path: root/drivers/i2c/busses/i2c-fsi.c
AgeCommit message (Collapse)AuthorFilesLines
2019-09-03i2c: fsi: Add of_put_node() before breakNishka Dasgupta1-1/+3
Each iteration of for_each_available_childe_of_node puts the previous node, but in the case of a break from the middle of the loop, there is no put, thus causing a memory leak. Add an of_node_put before the break. Issue found with Coccinelle. Signed-off-by: Nishka Dasgupta <nishkadg.linux@gmail.com> Reviewed-by: Eddie James <eajames@linux.ibm.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
2019-06-08i2c: fsi: Create busses for all portsOliver O'Halloran1-5/+27
Currently we only create an I2C bus for the ports listed in the device-tree for that master. There's no real reason for this since we can discover the number of ports the master supports by looking at the port_max field of the status register. This patch re-works the bus add logic so that we always create buses for each port, unless the bus is marked as unavailable in the DT. This is useful since it ensures that all the buses provided by the CFAM I2C master are accessible to debug tools. Signed-off-by: Oliver O'Halloran <oohall@gmail.com> Reviewed-by: Eddie James <eajames@linux.ibm.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
2018-07-21i2c: fsi: Add bus recoveryEddie James1-0/+132
Bus recovery should reset the bus with the standard i2c recovery procedure. Populate the necessary fields so that the standard procedure can perform the reset. Signed-off-by: Eddie James <eajames@linux.vnet.ibm.com> Tested-by: Joel Stanley <joel@jms.id.au> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
2018-07-21i2c: fsi: Add I2C master lockingEddie James1-4/+12
Since there are many ports per master, each with it's own adapter and chardev, we need some locking to prevent transfers from changing the master state while other transfers are in progress. Signed-off-by: Eddie James <eajames@linux.vnet.ibm.com> Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com> Tested-by: Joel Stanley <joel@jms.id.au> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
2018-07-21i2c: fsi: Add transfer implementationEddie James1-2/+193
Execute I2C transfers from the FSI-attached I2C master. Use polling instead of interrupts as we have no hardware IRQ over FSI. Signed-off-by: Eddie James <eajames@linux.vnet.ibm.com> Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com> Tested-by: Joel Stanley <joel@jms.id.au> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
2018-07-21i2c: fsi: Add abort and hardware reset proceduresEddie James1-0/+91
Add abort procedure for failed transfers. Add engine reset procedure that is executed during the abort to recover from various fault conditions. Signed-off-by: Eddie James <eajames@linux.vnet.ibm.com> Tested-by: Joel Stanley <joel@jms.id.au> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
2018-07-21i2c: fsi: Add port structuresEddie James1-0/+91
Add and initialize I2C adapters for each port on the FSI-attached I2C master. Ports for each master are defined in the devicetree. Signed-off-by: Eddie James <eajames@linux.vnet.ibm.com> Tested-by: Joel Stanley <joel@jms.id.au> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
2018-07-21i2c: Add FSI-attached I2C master algorithmEddie James1-0/+239
Add register definitions for FSI-attached I2C master and functions to access those registers over FSI. Add an FSI driver so that our I2C bus is probed up during an FSI scan. Signed-off-by: Eddie James <eajames@linux.vnet.ibm.com> Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com> Tested-by: Joel Stanley <joel@jms.id.au> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
generated by cgit v1.2.3 (git 2.39.0) at 2024-08-19 21:43:17 +0300