[PATCH v2 2/3] mtd: nand: mediatek: add support for different MTK NAND FLASH Controller IP
Boris Brezillon
boris.brezillon at free-electrons.com
Thu May 11 23:44:01 PDT 2017
On Fri, 12 May 2017 12:33:22 +0800
Xiaolei Li <xiaolei.li at mediatek.com> wrote:
> ECC strength and spare size supported may be different among MTK NAND
> FLASH Controller IPs.
>
> This patch contains changes as following:
> (1) add new enum mtk_nfc_spare_format to list all spare format.
> (2) add new struct mtk_nfc_devdata to support different spare format and
> size.
> (3) add new struct mtk_ecc_devdata to support different max ecc strength.
> (4) malloc ecc->eccdata buffer according to max ecc strength of this IP.
>
> Signed-off-by: Xiaolei Li <xiaolei.li at mediatek.com>
> ---
> drivers/mtd/nand/mtk_ecc.c | 67 ++++++++++++++------
> drivers/mtd/nand/mtk_ecc.h | 2 +-
> drivers/mtd/nand/mtk_nand.c | 148 ++++++++++++++++++++++++++++++--------------
> 3 files changed, 150 insertions(+), 67 deletions(-)
>
> diff --git a/drivers/mtd/nand/mtk_ecc.c b/drivers/mtd/nand/mtk_ecc.c
> index dbf2562..94d0791 100644
> --- a/drivers/mtd/nand/mtk_ecc.c
> +++ b/drivers/mtd/nand/mtk_ecc.c
> @@ -66,7 +66,6 @@
> #define DEC_CNFG_CORRECT (0x3 << 12)
> #define ECC_DECIDLE (0x10C)
> #define ECC_DECENUM0 (0x114)
> -#define ERR_MASK (0x3f)
> #define ECC_DECDONE (0x124)
> #define ECC_DECIRQ_EN (0x200)
> #define ECC_DECIRQ_STA (0x204)
> @@ -78,8 +77,14 @@
> #define ECC_IRQ_REG(op) ((op) == ECC_ENCODE ? \
> ECC_ENCIRQ_EN : ECC_DECIRQ_EN)
>
> +struct mtk_ecc_devdata {
I usually prefer a _caps suffix (instead of _devdata) for this kind of
per-IP capability variations, but that's not a strong requirement.
> + u32 err_mask;
> + u8 max_ecc_strength;
> +};
> +
> struct mtk_ecc {
> struct device *dev;
> + const struct mtk_ecc_devdata *devdata;
> void __iomem *regs;
> struct clk *clk;
>
> @@ -87,7 +92,7 @@ struct mtk_ecc {
> struct mutex lock;
> u32 sectors;
>
> - u8 eccdata[112];
> + u8 *eccdata;
> };
>
> static inline void mtk_ecc_wait_idle(struct mtk_ecc *ecc,
> @@ -247,8 +252,8 @@ void mtk_ecc_get_stats(struct mtk_ecc *ecc, struct mtk_ecc_stats *stats,
> offset = (i >> 2) << 2;
> err = readl(ecc->regs + ECC_DECENUM0 + offset);
> err = err >> ((i % 4) * 8);
> - err &= ERR_MASK;
> - if (err == ERR_MASK) {
> + err &= ecc->devdata->err_mask;
> + if (err == ecc->devdata->err_mask) {
> /* uncorrectable errors */
> stats->failed++;
> continue;
> @@ -409,37 +414,68 @@ int mtk_ecc_encode(struct mtk_ecc *ecc, struct mtk_ecc_config *config,
> }
> EXPORT_SYMBOL(mtk_ecc_encode);
>
> -void mtk_ecc_adjust_strength(u32 *p)
> +void mtk_ecc_adjust_strength(struct mtk_ecc *ecc, u32 *p)
> {
> - u32 ecc[] = {4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 28, 32, 36,
> - 40, 44, 48, 52, 56, 60};
> + u32 ecc_level[] = {4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 28, 32, 36,
> + 40, 44, 48, 52, 56, 60};
Can we rename this variable strength or ecc_strength. It should also
probably be a static const. Also, if some variation do not support the
whole set of strengths, it would be safer to have the strengths array
(and its size) directly stored in mtd_ecc_devdata.
> int i;
>
> - for (i = 0; i < ARRAY_SIZE(ecc); i++) {
> - if (*p <= ecc[i]) {
> + if (*p >= ecc->devdata->max_ecc_strength) {
> + *p = ecc->devdata->max_ecc_strength;
> + return;
> + }
> +
> + for (i = 0; i < ARRAY_SIZE(ecc_level); i++) {
> + if (*p <= ecc_level[i]) {
> if (!i)
> - *p = ecc[i];
> - else if (*p != ecc[i])
> - *p = ecc[i - 1];
> + *p = ecc_level[i];
> + else if (*p != ecc_level[i])
> + *p = ecc_level[i - 1];
I know I initially reviewed and merge this driver, but I really don't
understand why we decide to take a weaker ECC if the strength does not
exactly match what was requested. It should be the opposite: take a
stronger ECC config, unless ECC bytes do not fit in the OOB area.
> return;
> }
> }
>
> - *p = ecc[ARRAY_SIZE(ecc) - 1];
> + *p = ecc_level[ARRAY_SIZE(ecc_level) - 1];
> }
> EXPORT_SYMBOL(mtk_ecc_adjust_strength);
>
> +static const struct mtk_ecc_devdata mtk_ecc_devdata_mt2701 = {
> + .err_mask = 0x3f,
> + .max_ecc_strength = 60,
> +};
> +
> +static const struct of_device_id mtk_ecc_dt_match[] = {
> + {
> + .compatible = "mediatek,mt2701-ecc",
> + .data = &mtk_ecc_devdata_mt2701,
> + },
> + {},
> +};
> +
> static int mtk_ecc_probe(struct platform_device *pdev)
> {
> struct device *dev = &pdev->dev;
> struct mtk_ecc *ecc;
> struct resource *res;
> + const struct of_device_id *of_ecc_id = NULL;
> + u32 temp;
Please rename max_eccdata_size, or something more precise than temp.
temp is acceptable when the variable is used several times to calculate
various things. That's not the case here.
> int irq, ret;
>
> ecc = devm_kzalloc(dev, sizeof(*ecc), GFP_KERNEL);
> if (!ecc)
> return -ENOMEM;
>
> + of_ecc_id = of_match_device(mtk_ecc_dt_match, &pdev->dev);
> + if (!of_ecc_id)
> + return -ENODEV;
Blank line please.
> + ecc->devdata = (struct mtk_ecc_devdata *)of_ecc_id->data;
The cast is unneeded.
> +
> + temp = (ecc->devdata->max_ecc_strength * ECC_PARITY_BITS + 7) >> 3;
> + temp = round_up(temp, 4);
> + ecc->eccdata = devm_kzalloc(dev, temp, GFP_KERNEL);
> + if (!ecc->eccdata)
> + return -ENOMEM;
> +
> res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> ecc->regs = devm_ioremap_resource(dev, res);
> if (IS_ERR(ecc->regs)) {
> @@ -508,11 +544,6 @@ static int mtk_ecc_resume(struct device *dev)
> static SIMPLE_DEV_PM_OPS(mtk_ecc_pm_ops, mtk_ecc_suspend, mtk_ecc_resume);
> #endif
>
> -static const struct of_device_id mtk_ecc_dt_match[] = {
> - { .compatible = "mediatek,mt2701-ecc" },
> - {},
> -};
> -
> MODULE_DEVICE_TABLE(of, mtk_ecc_dt_match);
>
> static struct platform_driver mtk_ecc_driver = {
> diff --git a/drivers/mtd/nand/mtk_ecc.h b/drivers/mtd/nand/mtk_ecc.h
> index cbeba5c..d245c14 100644
> --- a/drivers/mtd/nand/mtk_ecc.h
> +++ b/drivers/mtd/nand/mtk_ecc.h
> @@ -42,7 +42,7 @@ struct mtk_ecc_config {
> int mtk_ecc_wait_done(struct mtk_ecc *, enum mtk_ecc_operation);
> int mtk_ecc_enable(struct mtk_ecc *, struct mtk_ecc_config *);
> void mtk_ecc_disable(struct mtk_ecc *);
> -void mtk_ecc_adjust_strength(u32 *);
> +void mtk_ecc_adjust_strength(struct mtk_ecc *ecc, u32 *p);
>
> struct mtk_ecc *of_mtk_ecc_get(struct device_node *);
> void mtk_ecc_release(struct mtk_ecc *);
> diff --git a/drivers/mtd/nand/mtk_nand.c b/drivers/mtd/nand/mtk_nand.c
> index 6c517c6..1a64ea2 100644
> --- a/drivers/mtd/nand/mtk_nand.c
> +++ b/drivers/mtd/nand/mtk_nand.c
> @@ -24,6 +24,7 @@
> #include <linux/module.h>
> #include <linux/iopoll.h>
> #include <linux/of.h>
> +#include <linux/of_device.h>
> #include "mtk_ecc.h"
>
> /* NAND controller register definition */
> @@ -38,23 +39,6 @@
> #define NFI_PAGEFMT (0x04)
> #define PAGEFMT_FDM_ECC_SHIFT (12)
> #define PAGEFMT_FDM_SHIFT (8)
> -#define PAGEFMT_SPARE_16 (0)
> -#define PAGEFMT_SPARE_26 (1)
> -#define PAGEFMT_SPARE_27 (2)
> -#define PAGEFMT_SPARE_28 (3)
> -#define PAGEFMT_SPARE_32 (4)
> -#define PAGEFMT_SPARE_36 (5)
> -#define PAGEFMT_SPARE_40 (6)
> -#define PAGEFMT_SPARE_44 (7)
> -#define PAGEFMT_SPARE_48 (8)
> -#define PAGEFMT_SPARE_49 (9)
> -#define PAGEFMT_SPARE_50 (0xa)
> -#define PAGEFMT_SPARE_51 (0xb)
> -#define PAGEFMT_SPARE_52 (0xc)
> -#define PAGEFMT_SPARE_62 (0xd)
> -#define PAGEFMT_SPARE_63 (0xe)
> -#define PAGEFMT_SPARE_64 (0xf)
> -#define PAGEFMT_SPARE_SHIFT (4)
> #define PAGEFMT_SEC_SEL_512 BIT(2)
> #define PAGEFMT_512_2K (0)
> #define PAGEFMT_2K_4K (1)
> @@ -116,6 +100,11 @@
> #define MTK_MAX_SECTOR (16)
> #define MTK_NAND_MAX_NSELS (2)
>
> +struct mtk_nfc_devdata {
> + const u32 *spare_format;
> + const u8 *spare_size;
> +};
> +
> struct mtk_nfc_bad_mark_ctl {
> void (*bm_swap)(struct mtd_info *, u8 *buf, int raw);
> u32 sec;
> @@ -155,6 +144,7 @@ struct mtk_nfc {
> struct mtk_ecc *ecc;
>
> struct device *dev;
> + struct mtk_nfc_devdata *devdata;
> void __iomem *regs;
>
> struct completion done;
> @@ -163,6 +153,53 @@ struct mtk_nfc {
> u8 *buffer;
> };
>
> +/* NFC Page Format Control Register Spare Size Field Definition */
> +enum mtk_nfc_spare_format {
> + PAGEFMT_SPARE_16,
> + PAGEFMT_SPARE_26,
> + PAGEFMT_SPARE_27,
> + PAGEFMT_SPARE_28,
> + PAGEFMT_SPARE_32,
> + PAGEFMT_SPARE_36,
> + PAGEFMT_SPARE_40,
> + PAGEFMT_SPARE_44,
> + PAGEFMT_SPARE_48,
> + PAGEFMT_SPARE_49,
> + PAGEFMT_SPARE_50,
> + PAGEFMT_SPARE_51,
> + PAGEFMT_SPARE_52,
> + PAGEFMT_SPARE_62,
> + PAGEFMT_SPARE_63,
> + PAGEFMT_SPARE_64,
> +};
> +
> +static const u32 mtk_nfc_spare_format_mt2701[] = {
> + [PAGEFMT_SPARE_16] = (0 << 4),
> + [PAGEFMT_SPARE_26] = (1 << 4),
> + [PAGEFMT_SPARE_27] = (2 << 4),
> + [PAGEFMT_SPARE_28] = (3 << 4),
> + [PAGEFMT_SPARE_32] = (4 << 4),
> + [PAGEFMT_SPARE_36] = (5 << 4),
> + [PAGEFMT_SPARE_40] = (6 << 4),
> + [PAGEFMT_SPARE_44] = (7 << 4),
> + [PAGEFMT_SPARE_48] = (8 << 4),
> + [PAGEFMT_SPARE_49] = (9 << 4),
> + [PAGEFMT_SPARE_50] = (10 << 4),
> + [PAGEFMT_SPARE_51] = (11 << 4),
> + [PAGEFMT_SPARE_52] = (12 << 4),
> + [PAGEFMT_SPARE_62] = (13 << 4),
> + [PAGEFMT_SPARE_63] = (14 << 4),
> + [PAGEFMT_SPARE_64] = (15 << 4),
> +};
> +
> +/*
> + * supported spare size of each IP
> + * 255 is used as ending flag
> + */
> +static const u8 spare_size_mt2701[] = {
> + 16, 26, 27, 28, 32, 36, 40, 44, 48, 49, 50, 51, 52, 62, 63, 64, 255
> +};
I guess 255 (or 0xff) is a sentinel. That's probably easier to store
the array size along with the spare_size array in mtk_nfc_devdata.
> +
> static inline struct mtk_nfc_nand_chip *to_mtk_nand(struct nand_chip *nand)
> {
> return container_of(nand, struct mtk_nfc_nand_chip, nand);
> @@ -308,6 +345,7 @@ static int mtk_nfc_hw_runtime_config(struct mtd_info *mtd)
> struct nand_chip *chip = mtd_to_nand(mtd);
> struct mtk_nfc_nand_chip *mtk_nand = to_mtk_nand(chip);
> struct mtk_nfc *nfc = nand_get_controller_data(chip);
> + const u32 *sparefmt = nfc->devdata->spare_format;
> u32 fmt, spare;
>
> if (!mtd->writesize)
> @@ -354,52 +392,52 @@ static int mtk_nfc_hw_runtime_config(struct mtd_info *mtd)
>
> switch (spare) {
> case 16:
> - fmt |= (PAGEFMT_SPARE_16 << PAGEFMT_SPARE_SHIFT);
> + fmt |= sparefmt[PAGEFMT_SPARE_16];
> break;
> case 26:
> - fmt |= (PAGEFMT_SPARE_26 << PAGEFMT_SPARE_SHIFT);
> + fmt |= sparefmt[PAGEFMT_SPARE_26];
> break;
> case 27:
> - fmt |= (PAGEFMT_SPARE_27 << PAGEFMT_SPARE_SHIFT);
> + fmt |= sparefmt[PAGEFMT_SPARE_27];
> break;
> case 28:
> - fmt |= (PAGEFMT_SPARE_28 << PAGEFMT_SPARE_SHIFT);
> + fmt |= sparefmt[PAGEFMT_SPARE_28];
> break;
> case 32:
> - fmt |= (PAGEFMT_SPARE_32 << PAGEFMT_SPARE_SHIFT);
> + fmt |= sparefmt[PAGEFMT_SPARE_32];
> break;
> case 36:
> - fmt |= (PAGEFMT_SPARE_36 << PAGEFMT_SPARE_SHIFT);
> + fmt |= sparefmt[PAGEFMT_SPARE_36];
> break;
> case 40:
> - fmt |= (PAGEFMT_SPARE_40 << PAGEFMT_SPARE_SHIFT);
> + fmt |= sparefmt[PAGEFMT_SPARE_40];
> break;
> case 44:
> - fmt |= (PAGEFMT_SPARE_44 << PAGEFMT_SPARE_SHIFT);
> + fmt |= sparefmt[PAGEFMT_SPARE_44];
> break;
> case 48:
> - fmt |= (PAGEFMT_SPARE_48 << PAGEFMT_SPARE_SHIFT);
> + fmt |= sparefmt[PAGEFMT_SPARE_48];
> break;
> case 49:
> - fmt |= (PAGEFMT_SPARE_49 << PAGEFMT_SPARE_SHIFT);
> + fmt |= sparefmt[PAGEFMT_SPARE_49];
> break;
> case 50:
> - fmt |= (PAGEFMT_SPARE_50 << PAGEFMT_SPARE_SHIFT);
> + fmt |= sparefmt[PAGEFMT_SPARE_50];
> break;
> case 51:
> - fmt |= (PAGEFMT_SPARE_51 << PAGEFMT_SPARE_SHIFT);
> + fmt |= sparefmt[PAGEFMT_SPARE_51];
> break;
> case 52:
> - fmt |= (PAGEFMT_SPARE_52 << PAGEFMT_SPARE_SHIFT);
> + fmt |= sparefmt[PAGEFMT_SPARE_52];
> break;
> case 62:
> - fmt |= (PAGEFMT_SPARE_62 << PAGEFMT_SPARE_SHIFT);
> + fmt |= sparefmt[PAGEFMT_SPARE_62];
> break;
> case 63:
> - fmt |= (PAGEFMT_SPARE_63 << PAGEFMT_SPARE_SHIFT);
> + fmt |= sparefmt[PAGEFMT_SPARE_63];
> break;
> case 64:
> - fmt |= (PAGEFMT_SPARE_64 << PAGEFMT_SPARE_SHIFT);
> + fmt |= sparefmt[PAGEFMT_SPARE_64];
> break;
Could probably be turned into a for loop:
for (i = 0; i < nfc->devdata->num_spare_format; i++) {
if (nfc->devdata->spare_size[i] == spare)
break;
}
if (i == nfc->devdata->num_spare_format) {
dev_err()
return -EINVAL;
}
fmt |= sparefmt[i];
> default:
> dev_err(nfc->dev, "invalid spare per sector %d\n", spare);
> @@ -408,7 +446,7 @@ static int mtk_nfc_hw_runtime_config(struct mtd_info *mtd)
>
> fmt |= mtk_nand->fdm.reg_size << PAGEFMT_FDM_SHIFT;
> fmt |= mtk_nand->fdm.ecc_size << PAGEFMT_FDM_ECC_SHIFT;
> - nfi_writew(nfc, fmt, NFI_PAGEFMT);
> + nfi_writel(nfc, fmt, NFI_PAGEFMT);
Is this still compatible with the old IP? Maybe this should go in a
separate patch.
>
> nfc->ecc_cfg.strength = chip->ecc.strength;
> nfc->ecc_cfg.len = chip->ecc.size + mtk_nand->fdm.ecc_size;
> @@ -1009,7 +1047,7 @@ static inline void mtk_nfc_hw_init(struct mtk_nfc *nfc)
> * 0 : poll the status of the busy/ready signal after [7:4]*16 cycles.
> */
> nfi_writew(nfc, 0xf1, NFI_CNRNB);
> - nfi_writew(nfc, PAGEFMT_8K_16K, NFI_PAGEFMT);
> + nfi_writel(nfc, PAGEFMT_8K_16K, NFI_PAGEFMT);
>
> mtk_nfc_hw_reset(nfc);
>
> @@ -1134,8 +1172,8 @@ static void mtk_nfc_set_bad_mark_ctl(struct mtk_nfc_bad_mark_ctl *bm_ctl,
> static void mtk_nfc_set_spare_per_sector(u32 *sps, struct mtd_info *mtd)
> {
> struct nand_chip *nand = mtd_to_nand(mtd);
> - u32 spare[] = {16, 26, 27, 28, 32, 36, 40, 44,
> - 48, 49, 50, 51, 52, 62, 63, 64};
> + struct mtk_nfc *nfc = nand_get_controller_data(nand);
> + const u8 *spare = nfc->devdata->spare_size;
> u32 eccsteps, i;
>
> eccsteps = mtd->writesize / nand->ecc.size;
> @@ -1144,7 +1182,7 @@ static void mtk_nfc_set_spare_per_sector(u32 *sps, struct mtd_info *mtd)
> if (nand->ecc.size == 1024)
> *sps >>= 1;
>
> - for (i = 0; i < ARRAY_SIZE(spare); i++) {
> + for (i = 0; ; i++) {
With the array size in devdata you could check that i is less than
num_spare_format.
BTW, I don't see any check on the sentinel val.
> if (*sps <= spare[i]) {
> if (!i)
> *sps = spare[i];
> @@ -1154,9 +1192,6 @@ static void mtk_nfc_set_spare_per_sector(u32 *sps, struct mtd_info *mtd)
> }
> }
>
> - if (i >= ARRAY_SIZE(spare))
> - *sps = spare[ARRAY_SIZE(spare) - 1];
> -
> if (nand->ecc.size == 1024)
> *sps <<= 1;
> }
> @@ -1164,6 +1199,7 @@ static void mtk_nfc_set_spare_per_sector(u32 *sps, struct mtd_info *mtd)
> static int mtk_nfc_ecc_init(struct device *dev, struct mtd_info *mtd)
> {
> struct nand_chip *nand = mtd_to_nand(mtd);
> + struct mtk_nfc *nfc = nand_get_controller_data(nand);
> u32 spare;
> int free;
>
> @@ -1214,7 +1250,7 @@ static int mtk_nfc_ecc_init(struct device *dev, struct mtd_info *mtd)
> }
> }
>
> - mtk_ecc_adjust_strength(&nand->ecc.strength);
> + mtk_ecc_adjust_strength(nfc->ecc, &nand->ecc.strength);
>
> dev_info(dev, "eccsize %d eccstrength %d\n",
> nand->ecc.size, nand->ecc.strength);
> @@ -1354,12 +1390,27 @@ static int mtk_nfc_nand_chips_init(struct device *dev, struct mtk_nfc *nfc)
> return 0;
> }
>
> +static const struct mtk_nfc_devdata mtk_nfc_devdata_mt2701 = {
> + .spare_format = mtk_nfc_spare_format_mt2701,
> + .spare_size = spare_size_mt2701,
> +};
> +
> +static const struct of_device_id mtk_nfc_id_table[] = {
> + {
> + .compatible = "mediatek,mt2701-nfc",
> + .data = &mtk_nfc_devdata_mt2701,
> + },
> + {}
> +};
> +MODULE_DEVICE_TABLE(of, mtk_nfc_id_table);
> +
> static int mtk_nfc_probe(struct platform_device *pdev)
> {
> struct device *dev = &pdev->dev;
> struct device_node *np = dev->of_node;
> struct mtk_nfc *nfc;
> struct resource *res;
> + const struct of_device_id *of_nfc_id = NULL;
> int ret, irq;
>
> nfc = devm_kzalloc(dev, sizeof(*nfc), GFP_KERNEL);
> @@ -1423,6 +1474,13 @@ static int mtk_nfc_probe(struct platform_device *pdev)
> goto clk_disable;
> }
>
> + of_nfc_id = of_match_device(mtk_nfc_id_table, &pdev->dev);
> + if (!of_nfc_id) {
> + ret = -ENODEV;
> + goto clk_disable;
> + }
Blank line.
> + nfc->devdata = (struct mtk_nfc_devdata *)of_nfc_id->data;
Cast unneeded.
> +
> platform_set_drvdata(pdev, nfc);
>
> ret = mtk_nfc_nand_chips_init(dev, nfc);
> @@ -1503,12 +1561,6 @@ static int mtk_nfc_resume(struct device *dev)
> static SIMPLE_DEV_PM_OPS(mtk_nfc_pm_ops, mtk_nfc_suspend, mtk_nfc_resume);
> #endif
>
> -static const struct of_device_id mtk_nfc_id_table[] = {
> - { .compatible = "mediatek,mt2701-nfc" },
> - {}
> -};
> -MODULE_DEVICE_TABLE(of, mtk_nfc_id_table);
> -
> static struct platform_driver mtk_nfc_driver = {
> .probe = mtk_nfc_probe,
> .remove = mtk_nfc_remove,
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