mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-23 04:34:11 +08:00
ed2cea4f95
The variable data is being initialized with a value that is never
read and it is being updated later with a new value. The
initialization is redundant and can be removed.
Addresses-Coverity: ("Unused value")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
117 lines
2.3 KiB
C
117 lines
2.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* Cobalt NOR flash functions
|
|
*
|
|
* Copyright 2012-2015 Cisco Systems, Inc. and/or its affiliates.
|
|
* All rights reserved.
|
|
*/
|
|
|
|
#include <linux/mtd/mtd.h>
|
|
#include <linux/mtd/map.h>
|
|
#include <linux/mtd/cfi.h>
|
|
#include <linux/time.h>
|
|
|
|
#include "cobalt-flash.h"
|
|
|
|
#define ADRS(offset) (COBALT_BUS_FLASH_BASE + offset)
|
|
|
|
static struct map_info cobalt_flash_map = {
|
|
.name = "cobalt-flash",
|
|
.bankwidth = 2, /* 16 bits */
|
|
.size = 0x4000000, /* 64MB */
|
|
.phys = 0, /* offset */
|
|
};
|
|
|
|
static map_word flash_read16(struct map_info *map, unsigned long offset)
|
|
{
|
|
map_word r;
|
|
|
|
r.x[0] = cobalt_bus_read32(map->virt, ADRS(offset));
|
|
if (offset & 0x2)
|
|
r.x[0] >>= 16;
|
|
else
|
|
r.x[0] &= 0x0000ffff;
|
|
|
|
return r;
|
|
}
|
|
|
|
static void flash_write16(struct map_info *map, const map_word datum,
|
|
unsigned long offset)
|
|
{
|
|
u16 data = (u16)datum.x[0];
|
|
|
|
cobalt_bus_write16(map->virt, ADRS(offset), data);
|
|
}
|
|
|
|
static void flash_copy_from(struct map_info *map, void *to,
|
|
unsigned long from, ssize_t len)
|
|
{
|
|
u32 src = from;
|
|
u8 *dest = to;
|
|
u32 data;
|
|
|
|
while (len) {
|
|
data = cobalt_bus_read32(map->virt, ADRS(src));
|
|
do {
|
|
*dest = data >> (8 * (src & 3));
|
|
src++;
|
|
dest++;
|
|
len--;
|
|
} while (len && (src % 4));
|
|
}
|
|
}
|
|
|
|
static void flash_copy_to(struct map_info *map, unsigned long to,
|
|
const void *from, ssize_t len)
|
|
{
|
|
const u8 *src = from;
|
|
u32 dest = to;
|
|
|
|
pr_info("%s: offset 0x%x: length %zu\n", __func__, dest, len);
|
|
while (len) {
|
|
u16 data;
|
|
|
|
do {
|
|
data = *src << (8 * (dest & 1));
|
|
src++;
|
|
dest++;
|
|
len--;
|
|
} while (len && (dest % 2));
|
|
|
|
cobalt_bus_write16(map->virt, ADRS(dest - 2), data);
|
|
}
|
|
}
|
|
|
|
int cobalt_flash_probe(struct cobalt *cobalt)
|
|
{
|
|
struct map_info *map = &cobalt_flash_map;
|
|
struct mtd_info *mtd;
|
|
|
|
BUG_ON(!map_bankwidth_supported(map->bankwidth));
|
|
map->virt = cobalt->bar1;
|
|
map->read = flash_read16;
|
|
map->write = flash_write16;
|
|
map->copy_from = flash_copy_from;
|
|
map->copy_to = flash_copy_to;
|
|
|
|
mtd = do_map_probe("cfi_probe", map);
|
|
cobalt->mtd = mtd;
|
|
if (!mtd) {
|
|
cobalt_err("Probe CFI flash failed!\n");
|
|
return -1;
|
|
}
|
|
|
|
mtd->owner = THIS_MODULE;
|
|
mtd->dev.parent = &cobalt->pci_dev->dev;
|
|
mtd_device_register(mtd, NULL, 0);
|
|
return 0;
|
|
}
|
|
|
|
void cobalt_flash_remove(struct cobalt *cobalt)
|
|
{
|
|
if (cobalt->mtd) {
|
|
mtd_device_unregister(cobalt->mtd);
|
|
map_destroy(cobalt->mtd);
|
|
}
|
|
}
|