76 lines
1.6 KiB
C
76 lines
1.6 KiB
C
/*
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* drivers/misc/sram.c - generic memory mapped SRAM driver
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <common.h>
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#include <errno.h>
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#include <driver.h>
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#include <malloc.h>
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#include <init.h>
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struct sram {
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struct resource *res;
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char *name;
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struct cdev cdev;
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};
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static struct file_operations memops = {
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.read = mem_read,
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.write = mem_write,
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.memmap = generic_memmap_rw,
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.lseek = dev_lseek_default,
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};
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static int sram_probe(struct device_d *dev)
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{
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struct sram *sram;
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struct resource *res;
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void __iomem *base;
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int ret;
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base = dev_request_mem_region(dev, 0);
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if (!base)
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return -EBUSY;
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sram = xzalloc(sizeof(*sram));
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sram->cdev.name = asprintf("sram%d",
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cdev_find_free_index("sram"));
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res = dev_get_resource(dev, IORESOURCE_MEM, 0);
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sram->cdev.size = (unsigned long)resource_size(res);
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sram->cdev.ops = &memops;
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sram->cdev.dev = dev;
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ret = devfs_create(&sram->cdev);
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if (ret)
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return ret;
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return 0;
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}
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static __maybe_unused struct of_device_id sram_dt_ids[] = {
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{
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.compatible = "mmio-sram",
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}, {
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},
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};
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static struct driver_d sram_driver = {
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.name = "mmio-sram",
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.probe = sram_probe,
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.of_compatible = sram_dt_ids,
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};
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device_platform_driver(sram_driver);
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