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Subject[PATCH 7/9] mtd: nand: denali: use more FIELD_PREP / FIELD_GET where appropriate
Date
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>
---

drivers/mtd/nand/denali.c | 22 +++++++++++-----------
1 file changed, 11 insertions(+), 11 deletions(-)

diff --git a/drivers/mtd/nand/denali.c b/drivers/mtd/nand/denali.c
index 1525c4e..ca98015 100644
--- a/drivers/mtd/nand/denali.c
+++ b/drivers/mtd/nand/denali.c
@@ -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;
--
2.7.4
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