0ab5fe5374
The various FSI devices (sbefifo, occ, scom, more to come) currently use misc devices. This is problematic as the minor device space for misc is limited and there can be a lot of them. Also it limits our ability to move them to a dedicated /dev/fsi directory or to be smart about device naming and numbering. It also means we have IDAs on every single of these drivers This creates a common fsi "device_type" for the optional /dev/fsi grouping and a dev_t allocator for all FSI devices. "Legacy" devices get to use a backward compatible numbering scheme (as long as chip id <16 and there's only one copy of a given unit type per chip). A single major number and a single IDA are shared for all FSI devices. This doesn't convert the FSI device drivers to use the new scheme yet, they will be converted individually. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
94 lines
2.6 KiB
C
94 lines
2.6 KiB
C
/* FSI device & driver interfaces
|
|
*
|
|
* Copyright (C) IBM Corporation 2016
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*/
|
|
|
|
#ifndef LINUX_FSI_H
|
|
#define LINUX_FSI_H
|
|
|
|
#include <linux/device.h>
|
|
|
|
struct fsi_device {
|
|
struct device dev;
|
|
u8 engine_type;
|
|
u8 version;
|
|
u8 unit;
|
|
struct fsi_slave *slave;
|
|
uint32_t addr;
|
|
uint32_t size;
|
|
};
|
|
|
|
extern int fsi_device_read(struct fsi_device *dev, uint32_t addr,
|
|
void *val, size_t size);
|
|
extern int fsi_device_write(struct fsi_device *dev, uint32_t addr,
|
|
const void *val, size_t size);
|
|
extern int fsi_device_peek(struct fsi_device *dev, void *val);
|
|
|
|
struct fsi_device_id {
|
|
u8 engine_type;
|
|
u8 version;
|
|
};
|
|
|
|
#define FSI_VERSION_ANY 0
|
|
|
|
#define FSI_DEVICE(t) \
|
|
.engine_type = (t), .version = FSI_VERSION_ANY,
|
|
|
|
#define FSI_DEVICE_VERSIONED(t, v) \
|
|
.engine_type = (t), .version = (v),
|
|
|
|
struct fsi_driver {
|
|
struct device_driver drv;
|
|
const struct fsi_device_id *id_table;
|
|
};
|
|
|
|
#define to_fsi_dev(devp) container_of(devp, struct fsi_device, dev)
|
|
#define to_fsi_drv(drvp) container_of(drvp, struct fsi_driver, drv)
|
|
|
|
extern int fsi_driver_register(struct fsi_driver *fsi_drv);
|
|
extern void fsi_driver_unregister(struct fsi_driver *fsi_drv);
|
|
|
|
/* module_fsi_driver() - Helper macro for drivers that don't do
|
|
* anything special in module init/exit. This eliminates a lot of
|
|
* boilerplate. Each module may only use this macro once, and
|
|
* calling it replaces module_init() and module_exit()
|
|
*/
|
|
#define module_fsi_driver(__fsi_driver) \
|
|
module_driver(__fsi_driver, fsi_driver_register, \
|
|
fsi_driver_unregister)
|
|
|
|
/* direct slave API */
|
|
extern int fsi_slave_claim_range(struct fsi_slave *slave,
|
|
uint32_t addr, uint32_t size);
|
|
extern void fsi_slave_release_range(struct fsi_slave *slave,
|
|
uint32_t addr, uint32_t size);
|
|
extern int fsi_slave_read(struct fsi_slave *slave, uint32_t addr,
|
|
void *val, size_t size);
|
|
extern int fsi_slave_write(struct fsi_slave *slave, uint32_t addr,
|
|
const void *val, size_t size);
|
|
|
|
extern struct bus_type fsi_bus_type;
|
|
extern const struct device_type fsi_cdev_type;
|
|
|
|
enum fsi_dev_type {
|
|
fsi_dev_cfam,
|
|
fsi_dev_sbefifo,
|
|
fsi_dev_scom,
|
|
fsi_dev_occ
|
|
};
|
|
|
|
extern int fsi_get_new_minor(struct fsi_device *fdev, enum fsi_dev_type type,
|
|
dev_t *out_dev, int *out_index);
|
|
extern void fsi_free_minor(dev_t dev);
|
|
|
|
#endif /* LINUX_FSI_H */
|