[PATCH v2 24/53] mtd: nand: denali: remove meaningless writes to read-only registers

Masahiro Yamada
2017-03-22T14:10:10Z

The write accesses to LOGICAL_PAGE_{DATA,SPARE}_SIZE have no effect
because the Denali User's Guide says these registers are read-only.

The hardware automatically multiplies the main/spare size by the
number of devices and update LOGICAL_PAGE_{DATA,SPARE}_SIZE.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
---

Changes in v2: None

drivers/mtd/nand/denali.c | 16 ----------------
1 file changed, 16 deletions(-)

diff --git a/drivers/mtd/nand/denali.c b/drivers/mtd/nand/denali.c
index 3da0a0e..5e89709 100644
--- a/drivers/mtd/nand/denali.c
+++ b/drivers/mtd/nand/denali.c
@@ -342,8 +342,6 @@ static void get_samsung_nand_para(struct denali_nand_info *denali,

static void get_toshiba_nand_para(struct denali_nand_info *denali)
{
- uint32_t tmp;
-
/*
* Workaround to fix a controller bug which reports a wrong
* spare area size for some kind of Toshiba NAND device
@@ -351,10 +349,6 @@ static void get_toshiba_nand_para(struct denali_nand_info *denali)
if ((ioread32(denali->flash_reg + DEVICE_MAIN_AREA_SIZE) == 4096) &&
(ioread32(denali->flash_reg + DEVICE_SPARE_AREA_SIZE) == 64)) {
iowrite32(216, denali->flash_reg + DEVICE_SPARE_AREA_SIZE);
- tmp = ioread32(denali->flash_reg + DEVICES_CONNECTED) *
- ioread32(denali->flash_reg + DEVICE_SPARE_AREA_SIZE);
- iowrite32(tmp,
- denali->flash_reg + LOGICAL_PAGE_SPARE_SIZE);
#if SUPPORT_15BITECC
iowrite32(15, denali->flash_reg + ECC_CORRECTION);
#elif SUPPORT_8BITECC
@@ -366,22 +360,12 @@ static void get_toshiba_nand_para(struct denali_nand_info *denali)
static void get_hynix_nand_para(struct denali_nand_info *denali,
uint8_t device_id)
{
- uint32_t main_size, spare_size;
-
switch (device_id) {
case 0xD5: /* Hynix H27UAG8T2A, H27UBG8U5A or H27UCG8VFA */
case 0xD7: /* Hynix H27UDG8VEM, H27UCG8UDM or H27UCG8V5A */
iowrite32(128, denali->flash_reg + PAGES_PER_BLOCK);
iowrite32(4096, denali->flash_reg + DEVICE_MAIN_AREA_SIZE);
iowrite32(224, denali->flash_reg + DEVICE_SPARE_AREA_SIZE);
- main_size = 4096 *
- ioread32(denali->flash_reg + DEVICES_CONNECTED);
- spare_size = 224 *
- ioread32(denali->flash_reg + DEVICES_CONNECTED);
- iowrite32(main_size,
- denali->flash_reg + LOGICAL_PAGE_DATA_SIZE);
- iowrite32(spare_size,
- denali->flash_reg + LOGICAL_PAGE_SPARE_SIZE);
iowrite32(0, denali->flash_reg + DEVICE_WIDTH);
#if SUPPORT_15BITECC
iowrite32(15, denali->flash_reg + ECC_CORRECTION);
--
2.7.4