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/*
* FSI core driver
*
* 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.
*/
#include <linux/device.h>
#include <linux/fsi.h>
#include <linux/idr.h>
#include <linux/module.h>
#include "fsi-master.h"
static DEFINE_IDA(master_ida);
struct fsi_slave {
struct device dev;
struct fsi_master *master;
int id;
int link;
uint32_t size; /* size of slave address space */
};
#define to_fsi_slave(d) container_of(d, struct fsi_slave, dev)
/* FSI slave support */
static int fsi_slave_init(struct fsi_master *master, int link, uint8_t id)
{
/* todo: initialise slave device, perform engine scan */
return -ENODEV;
}
/* FSI master support */
static int fsi_master_scan(struct fsi_master *master)
{
int link;
for (link = 0; link < master->n_links; link++)
fsi_slave_init(master, link, 0);
return 0;
}
int fsi_master_register(struct fsi_master *master)
{
int rc;
if (!master)
return -EINVAL;
master->idx = ida_simple_get(&master_ida, 0, INT_MAX, GFP_KERNEL);
dev_set_name(&master->dev, "fsi%d", master->idx);
rc = device_register(&master->dev);
if (rc) {
ida_simple_remove(&master_ida, master->idx);
return rc;
}
fsi_master_scan(master);
return 0;
}
EXPORT_SYMBOL_GPL(fsi_master_register);
void fsi_master_unregister(struct fsi_master *master)
{
if (master->idx >= 0) {
ida_simple_remove(&master_ida, master->idx);
master->idx = -1;
}
device_unregister(&master->dev);
}
EXPORT_SYMBOL_GPL(fsi_master_unregister);
/* FSI core & Linux bus type definitions */
static int fsi_bus_match(struct device *dev, struct device_driver *drv)
{
struct fsi_device *fsi_dev = to_fsi_dev(dev);
struct fsi_driver *fsi_drv = to_fsi_drv(drv);
const struct fsi_device_id *id;
if (!fsi_drv->id_table)
return 0;
for (id = fsi_drv->id_table; id->engine_type; id++) {
if (id->engine_type != fsi_dev->engine_type)
continue;
if (id->version == FSI_VERSION_ANY ||
id->version == fsi_dev->version)
return 1;
}
return 0;
}
struct bus_type fsi_bus_type = {
.name = "fsi",
.match = fsi_bus_match,
};
EXPORT_SYMBOL_GPL(fsi_bus_type);
static int fsi_init(void)
{
return bus_register(&fsi_bus_type);
}
static void fsi_exit(void)
{
bus_unregister(&fsi_bus_type);
}
module_init(fsi_init);
module_exit(fsi_exit);
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