kernel/linux.git/include/linux/mcb.h, branch v4.19.310

mcb: remove is_added flag from mcb_device struct

2023-10-25T09:16:31+00:00

commit 0f28ada1fbf0054557cddcdb93ad17f767105208 upstream. When calling mcb_bus_add_devices(), both mcb devices and the mcb bus will attempt to attach a device to a driver because they share the same bus_type. This causes an issue when trying to cast the container of the device to mcb_device struct using to_mcb_device(), leading to a wrong cast when the mcb_bus is added. A crash occurs when freing the ida resources as the bus numbering of mcb_bus gets confused with the is_added flag on the mcb_device struct. The only reason for this cast was to keep an is_added flag on the mcb_device struct that does not seem necessary. The function device_attach() handles already bound devices and the mcb subsystem does nothing special with this is_added flag so remove it completely. Fixes: 18d288198099 ("mcb: Correctly initialize the bus's device") Cc: stable Signed-off-by: Jorge Sanjuan Garcia Co-developed-by: Jose Javier Rodriguez Barbarin Signed-off-by: Jose Javier Rodriguez Barbarin Link: https://lore.kernel.org/r/20230906114901.63174-2-JoseJavier.Rodriguez@duagon.com Signed-off-by: Greg Kroah-Hartman

mcb: introduce mcb_get_resource()

2017-08-28T18:51:22+00:00

Introduce mcb_get_resource() as a common accessor to a mcb device's memory or IRQ resources. Signed-off-by: Johannes Thumshirn Signed-off-by: Greg Kroah-Hartman

mcb: Add a dma_device to mcb_device

2016-09-27T10:33:47+00:00

When performing DMA operations on a MCB device, the device needed for using the DMA API is "mcb_device->bus_carrier". This is rather lengthy, so a shortcut is introduced to struct mcb_device in order to ensure the MCB device driver uses the correct device for DMA operations. Signed-off-by: Michael Moese Signed-off-by: Johannes Thumshirn Signed-off-by: Greg Kroah-Hartman

mcb: remove sub-device handling code

2016-08-31T11:16:24+00:00

The MEN Chameleon specification states that a chameleon FPGA can include a bridge descriptor, which then opens up a new bus behind this bridge. MCB included subdevice handling code in the core, but no support for bus descriptors in the parser, due to a lack of hardware access. As this is technically dead code, but it gets executed on a device add, I've decided to remove it. Signed-off-by: Johannes Thumshirn Signed-off-by: Greg Kroah-Hartman

mcb: Introduce type safety for to_mcb_*

2016-08-31T11:16:24+00:00

The to_mcb_{bus,device,driver}() macros lacked type safety, so convert them to inline functions to enforce compile time type checking. Signed-off-by: Johannes Thumshirn Signed-off-by: Greg Kroah-Hartman

mcb: export bus information via sysfs

2016-05-03T22:07:35+00:00

Export information about the bus stored in the FPGA's header to userspace via sysfs, instead of hiding it in pr_debug()s from everyone. Signed-off-by: Johannes Thumshirn Reviewed-by: Andreas Werner Tested-by: Andreas Werner Signed-off-by: Greg Kroah-Hartman

mcb: Correctly initialize the bus's device

2016-05-03T22:07:35+00:00

The mcb bus' device member wasn't correctly initialized and thus wasn't placed correctly into the driver model. Signed-off-by: Johannes Thumshirn Reviewed-by: Andreas Werner Tested-by: Andreas Werner Signed-off-by: Greg Kroah-Hartman

mcb: Add support for shared PCI IRQs

2014-05-28T00:38:11+00:00

Add support for shared PCI IRQs to mcb and mcb-pci. Signed-off-by: Johannes Thumshirn Signed-off-by: Greg Kroah-Hartman

drivers: Introduce MEN Chameleon Bus

2014-02-28T23:36:37+00:00

The MCB (MEN Chameleon Bus) is a Bus specific to MEN Mikroelektronik FPGA based devices. It is used to identify MCB based IP-Cores within an FPGA and provide the necessary framework for instantiating drivers for these devices. Signed-off-by: Johannes Thumshirn Signed-off-by: Greg Kroah-Hartman