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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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105 lines
2.9 KiB
C
105 lines
2.9 KiB
C
/*
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* Mapping of the rootfs in a physical region of memory
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*
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* Copyright (C) 2005-2007 PMC-Sierra Inc.
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* Author: Andrew Hughes, Andrew_Hughes@pmc-sierra.com
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
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* NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/fs.h>
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#include <linux/root_dev.h>
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#include <linux/mtd/mtd.h>
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#include <linux/mtd/map.h>
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#include <asm/io.h>
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#include <msp_prom.h>
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static struct mtd_info *rr_mtd;
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struct map_info rr_map = {
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.name = "ramroot",
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.bankwidth = 4,
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};
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static int __init init_rrmap(void)
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{
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void *ramroot_start;
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unsigned long ramroot_size;
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/* Check for supported rootfs types */
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if (get_ramroot(&ramroot_start, &ramroot_size)) {
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rr_map.phys = CPHYSADDR(ramroot_start);
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rr_map.size = ramroot_size;
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printk(KERN_NOTICE
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"PMC embedded root device: 0x%08lx @ 0x%08lx\n",
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rr_map.size, (unsigned long)rr_map.phys);
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} else {
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printk(KERN_ERR
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"init_rrmap: no supported embedded rootfs detected!\n");
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return -ENXIO;
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}
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/* Map rootfs to I/O space for block device driver */
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rr_map.virt = ioremap(rr_map.phys, rr_map.size);
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if (!rr_map.virt) {
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printk(KERN_ERR "Failed to ioremap\n");
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return -EIO;
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}
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simple_map_init(&rr_map);
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rr_mtd = do_map_probe("map_ram", &rr_map);
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if (rr_mtd) {
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rr_mtd->owner = THIS_MODULE;
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add_mtd_device(rr_mtd);
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return 0;
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}
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iounmap(rr_map.virt);
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return -ENXIO;
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}
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static void __exit cleanup_rrmap(void)
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{
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del_mtd_device(rr_mtd);
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map_destroy(rr_mtd);
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iounmap(rr_map.virt);
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rr_map.virt = NULL;
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}
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MODULE_AUTHOR("PMC-Sierra, Inc");
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MODULE_DESCRIPTION("MTD map driver for embedded PMC-Sierra MSP filesystem");
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MODULE_LICENSE("GPL");
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module_init(init_rrmap);
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module_exit(cleanup_rrmap);
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