mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-23 12:43:55 +08:00
022c674728
This is selected sections of the current manual for fmc-bus, as developed outside of the kernel before submission. Like the other patches in this set, it corresponds to commit ab23167f of the repository at ohwr.org Signed-off-by: Alessandro Rubini <rubini@gnudd.com> Acked-by: Juan David Gonzalez Cobas <dcobas@cern.ch> Acked-by: Emilio G. Cota <cota@braap.org> Acked-by: Samuel Iglesias Gonsalvez <siglesias@igalia.com> Acked-by: Rob Landley <rob@landley.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
48 lines
2.3 KiB
Plaintext
48 lines
2.3 KiB
Plaintext
Functions Exported by fmc.ko
|
|
****************************
|
|
|
|
The FMC core exports the usual 4 functions that are needed for a bus to
|
|
work, and a few more:
|
|
|
|
int fmc_driver_register(struct fmc_driver *drv);
|
|
void fmc_driver_unregister(struct fmc_driver *drv);
|
|
int fmc_device_register(struct fmc_device *fmc);
|
|
void fmc_device_unregister(struct fmc_device *fmc);
|
|
|
|
int fmc_device_register_n(struct fmc_device **fmc, int n);
|
|
void fmc_device_unregister_n(struct fmc_device **fmc, int n);
|
|
|
|
uint32_t fmc_readl(struct fmc_device *fmc, int offset);
|
|
void fmc_writel(struct fmc_device *fmc, uint32_t val, int off);
|
|
void *fmc_get_drvdata(struct fmc_device *fmc);
|
|
void fmc_set_drvdata(struct fmc_device *fmc, void *data);
|
|
|
|
int fmc_reprogram(struct fmc_device *f, struct fmc_driver *d, char *gw,
|
|
int sdb_entry);
|
|
|
|
The data structure that describe a device is detailed in *note FMC
|
|
Device::, the one that describes a driver is detailed in *note FMC
|
|
Driver::. Please note that structures of type fmc_device must be
|
|
allocated by the caller, but must not be released after unregistering.
|
|
The fmc-bus itself takes care of releasing the structure when their use
|
|
count reaches zero - actually, the device model does that in lieu of us.
|
|
|
|
The functions to register and unregister n devices are meant to be used
|
|
by carriers that host more than one mezzanine. The devices must all be
|
|
registered at the same time because if the FPGA is reprogrammed, all
|
|
devices in the array are affected. Usually, the driver matching the
|
|
first device will reprogram the FPGA, so other devices must know they
|
|
are already driven by a reprogrammed FPGA.
|
|
|
|
If a carrier hosts slots that are driven by different FPGA devices, it
|
|
should register as a group only mezzanines that are driven by the same
|
|
FPGA, for the reason outlined above.
|
|
|
|
Finally, the fmc_reprogram function calls the reprogram method (see
|
|
*note The API Offered by Carriers:: and also scans the memory area for
|
|
an SDB tree. You can pass -1 as sdb_entry to disable such scan.
|
|
Otherwise, the function fails if no tree is found at the specified
|
|
entry point. The function is meant to factorize common code, and by
|
|
the time you read this it is already used by the spec-sw and fine-delay
|
|
modules.
|