Messages in this thread Patch in this message | | | From | Samuel Holland <> | Subject | [PATCH 7/7] mtd: rawnand: sunxi: Precompute the ECC_CTL register value | Date | Thu, 29 Dec 2022 12:15:26 -0600 |
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This removes an unnecessary memory allocation, and avoids recomputing the same register value every time ECC is enabled.
Signed-off-by: Samuel Holland <samuel@sholland.org> ---
drivers/mtd/nand/raw/sunxi_nand.c | 75 ++++++------------------------- 1 file changed, 13 insertions(+), 62 deletions(-)
diff --git a/drivers/mtd/nand/raw/sunxi_nand.c b/drivers/mtd/nand/raw/sunxi_nand.c index a3bc9f7f9e5a..5c5a567d8870 100644 --- a/drivers/mtd/nand/raw/sunxi_nand.c +++ b/drivers/mtd/nand/raw/sunxi_nand.c @@ -169,22 +169,13 @@ struct sunxi_nand_chip_sel { s8 rb; }; -/** - * struct sunxi_nand_hw_ecc - stores information related to HW ECC support - * - * @mode: the sunxi ECC mode field deduced from ECC requirements - */ -struct sunxi_nand_hw_ecc { - int mode; -}; - /** * struct sunxi_nand_chip - stores NAND chip device related information * * @node: used to store NAND chips into a list * @nand: base NAND chip structure - * @ecc: ECC controller structure * @clk_rate: clk_rate required for this NAND chip + * @ecc_ctl: ECC_CTL register value for this NAND chip * @timing_cfg: TIMING_CFG register value for this NAND chip * @timing_ctl: TIMING_CTL register value for this NAND chip * @nsels: number of CS lines required by the NAND chip @@ -193,8 +184,8 @@ struct sunxi_nand_hw_ecc { struct sunxi_nand_chip { struct list_head node; struct nand_chip nand; - struct sunxi_nand_hw_ecc *ecc; unsigned long clk_rate; + u32 ecc_ctl; u32 timing_cfg; u32 timing_ctl; int nsels; @@ -689,26 +680,15 @@ static void sunxi_nfc_hw_ecc_enable(struct nand_chip *nand) { struct sunxi_nand_chip *sunxi_nand = to_sunxi_nand(nand); struct sunxi_nfc *nfc = to_sunxi_nfc(nand->controller); - u32 ecc_ctl; - - ecc_ctl = readl(nfc->regs + NFC_REG_ECC_CTL); - ecc_ctl &= ~(NFC_ECC_MODE_MSK | NFC_ECC_PIPELINE | - NFC_ECC_BLOCK_SIZE_MSK); - ecc_ctl |= NFC_ECC_EN | NFC_ECC_MODE(sunxi_nand->ecc->mode) | - NFC_ECC_EXCEPTION | NFC_ECC_PIPELINE; - - if (nand->ecc.size == 512) - ecc_ctl |= NFC_ECC_BLOCK_512; - writel(ecc_ctl, nfc->regs + NFC_REG_ECC_CTL); + writel(sunxi_nand->ecc_ctl, nfc->regs + NFC_REG_ECC_CTL); } static void sunxi_nfc_hw_ecc_disable(struct nand_chip *nand) { struct sunxi_nfc *nfc = to_sunxi_nfc(nand->controller); - writel(readl(nfc->regs + NFC_REG_ECC_CTL) & ~NFC_ECC_EN, - nfc->regs + NFC_REG_ECC_CTL); + writel(0, nfc->regs + NFC_REG_ECC_CTL); } static inline void sunxi_nfc_user_data_to_buf(u32 user_data, u8 *buf) @@ -1626,11 +1606,6 @@ static const struct mtd_ooblayout_ops sunxi_nand_ooblayout_ops = { .free = sunxi_nand_ooblayout_free, }; -static void sunxi_nand_hw_ecc_ctrl_cleanup(struct sunxi_nand_chip *sunxi_nand) -{ - kfree(sunxi_nand->ecc); -} - static int sunxi_nand_hw_ecc_ctrl_init(struct nand_chip *nand, struct nand_ecc_ctrl *ecc, struct device_node *np) @@ -1641,7 +1616,6 @@ static int sunxi_nand_hw_ecc_ctrl_init(struct nand_chip *nand, struct mtd_info *mtd = nand_to_mtd(nand); struct nand_device *nanddev = mtd_to_nanddev(mtd); int nsectors; - int ret; int i; if (nanddev->ecc.user_conf.flags & NAND_ECC_MAXIMIZE_STRENGTH) { @@ -1675,10 +1649,6 @@ static int sunxi_nand_hw_ecc_ctrl_init(struct nand_chip *nand, if (ecc->size != 512 && ecc->size != 1024) return -EINVAL; - sunxi_nand->ecc = kzalloc(sizeof(*sunxi_nand->ecc), GFP_KERNEL); - if (!sunxi_nand->ecc) - return -ENOMEM; - /* Prefer 1k ECC chunk over 512 ones */ if (ecc->size == 512 && mtd->writesize > 512) { ecc->size = 1024; @@ -1699,12 +1669,9 @@ static int sunxi_nand_hw_ecc_ctrl_init(struct nand_chip *nand, if (i >= ARRAY_SIZE(strengths)) { dev_err(nfc->dev, "unsupported strength\n"); - ret = -ENOTSUPP; - goto err; + return -ENOTSUPP; } - sunxi_nand->ecc->mode = i; - /* HW ECC always request ECC bytes for 1024 bytes blocks */ ecc->bytes = DIV_ROUND_UP(ecc->strength * fls(8 * 1024), 8); @@ -1713,10 +1680,14 @@ static int sunxi_nand_hw_ecc_ctrl_init(struct nand_chip *nand, nsectors = mtd->writesize / ecc->size; - if (mtd->oobsize < ((ecc->bytes + 4) * nsectors)) { - ret = -EINVAL; - goto err; - } + if (mtd->oobsize < ((ecc->bytes + 4) * nsectors)) + return -EINVAL; + + sunxi_nand->ecc_ctl = NFC_ECC_MODE(i) | NFC_ECC_EXCEPTION | + NFC_ECC_PIPELINE | NFC_ECC_EN; + + if (ecc->size == 512) + sunxi_nand->ecc_ctl |= NFC_ECC_BLOCK_512; ecc->read_oob = sunxi_nfc_hw_ecc_read_oob; ecc->write_oob = sunxi_nfc_hw_ecc_write_oob; @@ -1739,25 +1710,6 @@ static int sunxi_nand_hw_ecc_ctrl_init(struct nand_chip *nand, ecc->write_oob_raw = nand_write_oob_std; return 0; - -err: - kfree(sunxi_nand->ecc); - - return ret; -} - -static void sunxi_nand_ecc_cleanup(struct sunxi_nand_chip *sunxi_nand) -{ - struct nand_ecc_ctrl *ecc = &sunxi_nand->nand.ecc; - - switch (ecc->engine_type) { - case NAND_ECC_ENGINE_TYPE_ON_HOST: - sunxi_nand_hw_ecc_ctrl_cleanup(sunxi_nand); - break; - case NAND_ECC_ENGINE_TYPE_NONE: - default: - break; - } } static int sunxi_nand_attach_chip(struct nand_chip *nand) @@ -1970,7 +1922,6 @@ static void sunxi_nand_chips_cleanup(struct sunxi_nfc *nfc) ret = mtd_device_unregister(nand_to_mtd(chip)); WARN_ON(ret); nand_cleanup(chip); - sunxi_nand_ecc_cleanup(sunxi_nand); list_del(&sunxi_nand->node); } } -- 2.37.4
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