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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* drivers/misc/sram.c - generic memory mapped SRAM driver
*/
#include <common.h>
#include <errno.h>
#include <driver.h>
#include <malloc.h>
#include <init.h>
#include <linux/err.h>
struct sram {
struct resource *res;
char *name;
struct cdev cdev;
};
static struct cdev_operations memops = {
.read = mem_read,
.write = mem_write,
.memmap = generic_memmap_rw,
};
static int sram_probe(struct device *dev)
{
struct resource *iores;
struct sram *sram;
int ret;
iores = dev_request_mem_resource(dev, 0);
if (IS_ERR(iores))
return PTR_ERR(iores);
sram = xzalloc(sizeof(*sram));
sram->cdev.name = basprintf("sram%d", cdev_find_free_index("sram"));
sram->cdev.size = (unsigned long)resource_size(iores);
sram->cdev.ops = &memops;
sram->cdev.dev = dev;
ret = devfs_create(&sram->cdev);
if (ret)
return ret;
return 0;
}
static __maybe_unused struct of_device_id sram_dt_ids[] = {
{
.compatible = "mmio-sram",
}, {
},
};
MODULE_DEVICE_TABLE(of, sram_dt_ids);
static struct driver sram_driver = {
.name = "mmio-sram",
.probe = sram_probe,
.of_compatible = sram_dt_ids,
};
device_platform_driver(sram_driver);
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