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mtd: nand: denali: use more FIELD_PREP / FIELD_GET where appropriate 

In several places in this driver, the register fields are retrieved
as follows:

  val = reg & FOO_MASK;

Then, modified as follows:

  reg &= ~FOO_MASK;
  reg |= val;

This code relies on its shift is 0, which we will never know until
we check the definition of FOO_MASK.  Use FIELD_PREP / FIELD_GET
where appropriate.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
This commit is contained in:
Masahiro Yamada 2017-09-22 12:46:44 +09:00 committed by Boris Brezillon
parent e0d53b3f8e
commit 8e4cbf7f0a
1 changed files with 11 additions and 11 deletions
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22
drivers/mtd/nand/denali.c
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@ -88,7 +88,7 @@ static void denali_detect_max_banks(struct denali_nand_info *denali)
{
uint32_t features = ioread32(denali->reg + FEATURES);
denali->max_banks = 1 << (features & FEATURES__N_BANKS);
denali->max_banks = 1 << FIELD_GET(FEATURES__N_BANKS, features);
/* the encoding changed from rev 5.0 to 5.1 */
if (denali->revision < 0x0501)
@ -374,7 +374,7 @@ static int denali_hw_ecc_fixup(struct mtd_info *mtd,
return 0;
}
max_bitflips = ecc_cor & ECC_COR_INFO__MAX_ERRORS;
max_bitflips = FIELD_GET(ECC_COR_INFO__MAX_ERRORS, ecc_cor);
/*
* The register holds the maximum of per-sector corrected bitflips.
@ -985,7 +985,7 @@ static int denali_setup_data_interface(struct mtd_info *mtd, int chipnr,
tmp = ioread32(denali->reg + ACC_CLKS);
tmp &= ~ACC_CLKS__VALUE;
tmp |= acc_clks;
tmp |= FIELD_PREP(ACC_CLKS__VALUE, acc_clks);
iowrite32(tmp, denali->reg + ACC_CLKS);
/* tRWH -> RE_2_WE */
@ -994,7 +994,7 @@ static int denali_setup_data_interface(struct mtd_info *mtd, int chipnr,
tmp = ioread32(denali->reg + RE_2_WE);
tmp &= ~RE_2_WE__VALUE;
tmp |= re_2_we;
tmp |= FIELD_PREP(RE_2_WE__VALUE, re_2_we);
iowrite32(tmp, denali->reg + RE_2_WE);
/* tRHZ -> RE_2_RE */
@ -1003,7 +1003,7 @@ static int denali_setup_data_interface(struct mtd_info *mtd, int chipnr,
tmp = ioread32(denali->reg + RE_2_RE);
tmp &= ~RE_2_RE__VALUE;
tmp |= re_2_re;
tmp |= FIELD_PREP(RE_2_RE__VALUE, re_2_re);
iowrite32(tmp, denali->reg + RE_2_RE);
/* tWHR -> WE_2_RE */
@ -1012,7 +1012,7 @@ static int denali_setup_data_interface(struct mtd_info *mtd, int chipnr,
tmp = ioread32(denali->reg + TWHR2_AND_WE_2_RE);
tmp &= ~TWHR2_AND_WE_2_RE__WE_2_RE;
tmp |= we_2_re;
tmp |= FIELD_PREP(TWHR2_AND_WE_2_RE__WE_2_RE, we_2_re);
iowrite32(tmp, denali->reg + TWHR2_AND_WE_2_RE);
/* tADL -> ADDR_2_DATA */
@ -1026,8 +1026,8 @@ static int denali_setup_data_interface(struct mtd_info *mtd, int chipnr,
addr_2_data = min_t(int, addr_2_data, addr_2_data_mask);
tmp = ioread32(denali->reg + TCWAW_AND_ADDR_2_DATA);
tmp &= ~addr_2_data_mask;
tmp |= addr_2_data;
tmp &= ~TCWAW_AND_ADDR_2_DATA__ADDR_2_DATA;
tmp |= FIELD_PREP(TCWAW_AND_ADDR_2_DATA__ADDR_2_DATA, addr_2_data);
iowrite32(tmp, denali->reg + TCWAW_AND_ADDR_2_DATA);
/* tREH, tWH -> RDWR_EN_HI_CNT */
@ -1037,7 +1037,7 @@ static int denali_setup_data_interface(struct mtd_info *mtd, int chipnr,
tmp = ioread32(denali->reg + RDWR_EN_HI_CNT);
tmp &= ~RDWR_EN_HI_CNT__VALUE;
tmp |= rdwr_en_hi;
tmp |= FIELD_PREP(RDWR_EN_HI_CNT__VALUE, rdwr_en_hi);
iowrite32(tmp, denali->reg + RDWR_EN_HI_CNT);
/* tRP, tWP -> RDWR_EN_LO_CNT */
@ -1051,7 +1051,7 @@ static int denali_setup_data_interface(struct mtd_info *mtd, int chipnr,
tmp = ioread32(denali->reg + RDWR_EN_LO_CNT);
tmp &= ~RDWR_EN_LO_CNT__VALUE;
tmp |= rdwr_en_lo;
tmp |= FIELD_PREP(RDWR_EN_LO_CNT__VALUE, rdwr_en_lo);
iowrite32(tmp, denali->reg + RDWR_EN_LO_CNT);
/* tCS, tCEA -> CS_SETUP_CNT */
@ -1062,7 +1062,7 @@ static int denali_setup_data_interface(struct mtd_info *mtd, int chipnr,
tmp = ioread32(denali->reg + CS_SETUP_CNT);
tmp &= ~CS_SETUP_CNT__VALUE;
tmp |= cs_setup;
tmp |= FIELD_PREP(CS_SETUP_CNT__VALUE, cs_setup);
iowrite32(tmp, denali->reg + CS_SETUP_CNT);
return 0;