diff options
author | André Fabian Silva Delgado <emulatorman@parabola.nu> | 2015-09-08 01:01:14 -0300 |
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committer | André Fabian Silva Delgado <emulatorman@parabola.nu> | 2015-09-08 01:01:14 -0300 |
commit | e5fd91f1ef340da553f7a79da9540c3db711c937 (patch) | |
tree | b11842027dc6641da63f4bcc524f8678263304a3 /drivers/media/pci/cobalt/cobalt-flash.c | |
parent | 2a9b0348e685a63d97486f6749622b61e9e3292f (diff) |
Linux-libre 4.2-gnu
Diffstat (limited to 'drivers/media/pci/cobalt/cobalt-flash.c')
-rw-r--r-- | drivers/media/pci/cobalt/cobalt-flash.c | 128 |
1 files changed, 128 insertions, 0 deletions
diff --git a/drivers/media/pci/cobalt/cobalt-flash.c b/drivers/media/pci/cobalt/cobalt-flash.c new file mode 100644 index 000000000..04dcaf919 --- /dev/null +++ b/drivers/media/pci/cobalt/cobalt-flash.c @@ -0,0 +1,128 @@ +/* + * Cobalt NOR flash functions + * + * Copyright 2012-2015 Cisco Systems, Inc. and/or its affiliates. + * All rights reserved. + * + * This program is free software; you may redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; version 2 of the License. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, + * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND + * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS + * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN + * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN + * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE + * SOFTWARE. + */ + +#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 = 0xffff; + + 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); + } +} |