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mtd: brcmnand: clean up flash cache for parameter pages

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The read_byte() handling for accessing the flash cache has some awkward
swapping being done in the read_byte() function. Let's just make this a
byte array, and do the swapping with the word-level macros during the
initial buffer copy.

This is just a refactoring patch, with no (intended) functional change.

Signed-off-by: Brian Norris <computersforpeace@gmail.com>
Cc: Clay McClure <clay@daemons.net>
Cc: Ray Jui <rjui@broadcom.com>
Cc: Scott Branden <sbranden@broadcom.com>
Cc: <bcm-kernel-feedback-list@broadcom.com>
Tested-by: Clay McClure <clay@daemons.net>
This commit is contained in:
Brian Norris 2015-11-16 16:56:13 -08:00
parent c98f71d1c0
commit d618baf94c
1 changed files with 9 additions and 4 deletions
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13
drivers/mtd/nand/brcmnand/brcmnand.c
View file

@ -134,7 +134,7 @@ struct brcmnand_controller {
dma_addr_t dma_pa;
/* in-memory cache of the FLASH_CACHE, used only for some commands */
u32 flash_cache[FC_WORDS];
u8 flash_cache[FC_BYTES];
/* Controller revision details */
const u16 *reg_offsets;
@ -1188,6 +1188,8 @@ static void brcmnand_cmdfunc(struct mtd_info *mtd, unsigned command,
if (native_cmd == CMD_PARAMETER_READ ||
native_cmd == CMD_PARAMETER_CHANGE_COL) {
/* Copy flash cache word-wise */
u32 *flash_cache = (u32 *)ctrl->flash_cache;
int i;
brcmnand_soc_data_bus_prepare(ctrl->soc);
@ -1197,7 +1199,11 @@ static void brcmnand_cmdfunc(struct mtd_info *mtd, unsigned command,
* SECTOR_SIZE_1K may invalidate it
*/
for (i = 0; i < FC_WORDS; i++)
ctrl->flash_cache[i] = brcmnand_read_fc(ctrl, i);
/*
* Flash cache is big endian for parameter pages, at
* least on STB SoCs
*/
flash_cache[i] = be32_to_cpu(brcmnand_read_fc(ctrl, i));
brcmnand_soc_data_bus_unprepare(ctrl->soc);
@ -1250,8 +1256,7 @@ static uint8_t brcmnand_read_byte(struct mtd_info *mtd)
if (host->last_byte > 0 && offs == 0)
chip->cmdfunc(mtd, NAND_CMD_RNDOUT, addr, -1);
ret = ctrl->flash_cache[offs >> 2] >>
(24 - ((offs & 0x03) << 3));
ret = ctrl->flash_cache[offs];
break;
case NAND_CMD_GET_FEATURES:
if (host->last_byte >= ONFI_SUBFEATURE_PARAM_LEN) {