diff options
author | Yunhong Jiang <yunhong.jiang@intel.com> | 2015-08-04 12:17:53 -0700 |
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committer | Yunhong Jiang <yunhong.jiang@intel.com> | 2015-08-04 15:44:42 -0700 |
commit | 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 (patch) | |
tree | 1c9cafbcd35f783a87880a10f85d1a060db1a563 /kernel/drivers/mtd/devices/mtdram.c | |
parent | 98260f3884f4a202f9ca5eabed40b1354c489b29 (diff) |
Add the rt linux 4.1.3-rt3 as base
Import the rt linux 4.1.3-rt3 as OPNFV kvm base.
It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and
the base is:
commit 0917f823c59692d751951bf5ea699a2d1e2f26a2
Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Sat Jul 25 12:13:34 2015 +0200
Prepare v4.1.3-rt3
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
We lose all the git history this way and it's not good. We
should apply another opnfv project repo in future.
Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423
Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>
Diffstat (limited to 'kernel/drivers/mtd/devices/mtdram.c')
-rw-r--r-- | kernel/drivers/mtd/devices/mtdram.c | 158 |
1 files changed, 158 insertions, 0 deletions
diff --git a/kernel/drivers/mtd/devices/mtdram.c b/kernel/drivers/mtd/devices/mtdram.c new file mode 100644 index 000000000..8e2850892 --- /dev/null +++ b/kernel/drivers/mtd/devices/mtdram.c @@ -0,0 +1,158 @@ +/* + * mtdram - a test mtd device + * Author: Alexander Larsson <alex@cendio.se> + * + * Copyright (c) 1999 Alexander Larsson <alex@cendio.se> + * Copyright (c) 2005 Joern Engel <joern@wh.fh-wedel.de> + * + * This code is GPL + * + */ + +#include <linux/module.h> +#include <linux/slab.h> +#include <linux/ioport.h> +#include <linux/vmalloc.h> +#include <linux/init.h> +#include <linux/mtd/mtd.h> +#include <linux/mtd/mtdram.h> + +static unsigned long total_size = CONFIG_MTDRAM_TOTAL_SIZE; +static unsigned long erase_size = CONFIG_MTDRAM_ERASE_SIZE; +#define MTDRAM_TOTAL_SIZE (total_size * 1024) +#define MTDRAM_ERASE_SIZE (erase_size * 1024) + +#ifdef MODULE +module_param(total_size, ulong, 0); +MODULE_PARM_DESC(total_size, "Total device size in KiB"); +module_param(erase_size, ulong, 0); +MODULE_PARM_DESC(erase_size, "Device erase block size in KiB"); +#endif + +// We could store these in the mtd structure, but we only support 1 device.. +static struct mtd_info *mtd_info; + +static int ram_erase(struct mtd_info *mtd, struct erase_info *instr) +{ + memset((char *)mtd->priv + instr->addr, 0xff, instr->len); + instr->state = MTD_ERASE_DONE; + mtd_erase_callback(instr); + return 0; +} + +static int ram_point(struct mtd_info *mtd, loff_t from, size_t len, + size_t *retlen, void **virt, resource_size_t *phys) +{ + *virt = mtd->priv + from; + *retlen = len; + return 0; +} + +static int ram_unpoint(struct mtd_info *mtd, loff_t from, size_t len) +{ + return 0; +} + +/* + * Allow NOMMU mmap() to directly map the device (if not NULL) + * - return the address to which the offset maps + * - return -ENOSYS to indicate refusal to do the mapping + */ +static unsigned long ram_get_unmapped_area(struct mtd_info *mtd, + unsigned long len, + unsigned long offset, + unsigned long flags) +{ + return (unsigned long) mtd->priv + offset; +} + +static int ram_read(struct mtd_info *mtd, loff_t from, size_t len, + size_t *retlen, u_char *buf) +{ + memcpy(buf, mtd->priv + from, len); + *retlen = len; + return 0; +} + +static int ram_write(struct mtd_info *mtd, loff_t to, size_t len, + size_t *retlen, const u_char *buf) +{ + memcpy((char *)mtd->priv + to, buf, len); + *retlen = len; + return 0; +} + +static void __exit cleanup_mtdram(void) +{ + if (mtd_info) { + mtd_device_unregister(mtd_info); + vfree(mtd_info->priv); + kfree(mtd_info); + } +} + +int mtdram_init_device(struct mtd_info *mtd, void *mapped_address, + unsigned long size, const char *name) +{ + memset(mtd, 0, sizeof(*mtd)); + + /* Setup the MTD structure */ + mtd->name = name; + mtd->type = MTD_RAM; + mtd->flags = MTD_CAP_RAM; + mtd->size = size; + mtd->writesize = 1; + mtd->writebufsize = 64; /* Mimic CFI NOR flashes */ + mtd->erasesize = MTDRAM_ERASE_SIZE; + mtd->priv = mapped_address; + + mtd->owner = THIS_MODULE; + mtd->_erase = ram_erase; + mtd->_point = ram_point; + mtd->_unpoint = ram_unpoint; + mtd->_get_unmapped_area = ram_get_unmapped_area; + mtd->_read = ram_read; + mtd->_write = ram_write; + + if (mtd_device_register(mtd, NULL, 0)) + return -EIO; + + return 0; +} + +static int __init init_mtdram(void) +{ + void *addr; + int err; + + if (!total_size) + return -EINVAL; + + /* Allocate some memory */ + mtd_info = kmalloc(sizeof(struct mtd_info), GFP_KERNEL); + if (!mtd_info) + return -ENOMEM; + + addr = vmalloc(MTDRAM_TOTAL_SIZE); + if (!addr) { + kfree(mtd_info); + mtd_info = NULL; + return -ENOMEM; + } + err = mtdram_init_device(mtd_info, addr, MTDRAM_TOTAL_SIZE, "mtdram test device"); + if (err) { + vfree(addr); + kfree(mtd_info); + mtd_info = NULL; + return err; + } + memset(mtd_info->priv, 0xff, MTDRAM_TOTAL_SIZE); + return err; +} + +module_init(init_mtdram); +module_exit(cleanup_mtdram); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Alexander Larsson <alexl@redhat.com>"); +MODULE_DESCRIPTION("Simulated MTD driver for testing"); |