chip->ecc.hwctl() is used for preparing the H/W controller before read/write
NAND accesses (like assigning data-buf, enabling ECC scheme configs, etc.)
Though all ECC schemes in OMAP NAND driver use GPMC controller for generating
ECC syndrome (for both Read/Write accesses). But but in current code
HAM1_ECC and BCHx_ECC schemes implement individual function to achieve this.
This patch
(1) removes omap_hwecc_init() and omap_hwecc_init_bch()
as chip->ecc.hwctl will re-initializeGPMC before every read/write call.
omap_hwecc_init_bch() -> omap_enable_ecc_bch()
(2) merges the GPMC configuration code for all ECC schemes into
single omap_enable_hwecc(), thus adding scalability for future ECC schemes.
omap_enable_hwecc() + omap_enable_ecc_bch() -> omap_enable_hwecc()
Signed-off-by: Pekon Gupta <pe...@ti.com>
---
drivers/mtd/nand/omap_gpmc.c | 207 ++++++++++++-------------------------------
1 file changed, 58 insertions(+), 149 deletions(-)
diff --git a/drivers/mtd/nand/omap_gpmc.c b/drivers/mtd/nand/omap_gpmc.c
index d9a4a5e..b8f0e86 100644
--- a/drivers/mtd/nand/omap_gpmc.c
+++ b/drivers/mtd/nand/omap_gpmc.c
@@ -17,6 +17,9 @@
#include <nand.h>
#include <asm/arch/elm.h>
+
+#define SECTOR_BYTES 512
+
static uint8_t cs;
static __maybe_unused struct nand_ecclayout hw_nand_oob =
GPMC_NAND_HW_ECC_LAYOUT;
@@ -60,21 +63,6 @@ int omap_spl_dev_ready(struct mtd_info *mtd)
}
#endif
-/*
- * omap_hwecc_init - Initialize the Hardware ECC for NAND flash in
- * GPMC controller
- * @mtd: MTD device structure
- *
- */
-static void __maybe_unused omap_hwecc_init(struct nand_chip *chip)
-{
- /*
- * Init ECC Control Register
- * Clear all ECC | Enable Reg1
- */
- writel(ECCCLEAR | ECCRESULTREG1, &gpmc_cfg->ecc_control);
- writel(ECCSIZE1 | ECCSIZE0 | ECCSIZE0SEL, &gpmc_cfg->ecc_size_config);
-}
/*
* gen_true_ecc - This function will generate true ECC value, which
@@ -192,38 +180,6 @@ static int __maybe_unused omap_calculate_ecc(struct
mtd_info *mtd,
}
/*
- * omap_enable_ecc - This function enables the hardware ecc functionality
- * @mtd: MTD device structure
- * @mode: Read/Write mode
- */
-static void __maybe_unused omap_enable_hwecc(struct mtd_info *mtd, int32_t
mode)
-{
- struct nand_chip *chip = mtd->priv;
- uint32_t val, dev_width = (chip->options & NAND_BUSWIDTH_16) >> 1;
-
- switch (mode) {
- case NAND_ECC_READ:
- case NAND_ECC_WRITE:
- /* Clear the ecc result registers, select ecc reg as 1 */
- writel(ECCCLEAR | ECCRESULTREG1, &gpmc_cfg->ecc_control);
-
- /*
- * Size 0 = 0xFF, Size1 is 0xFF - both are 512 bytes
- * tell all regs to generate size0 sized regs
- * we just have a single ECC engine for all CS
- */
- writel(ECCSIZE1 | ECCSIZE0 | ECCSIZE0SEL,
- &gpmc_cfg->ecc_size_config);
- val = (dev_width << 7) | (cs << 1) | (0x1);
- writel(val, &gpmc_cfg->ecc_config);
- break;
- default:
- printf("Error: Unrecognized Mode[%d]!\n", mode);
- break;
- }
-}
-
-/*
* Generic BCH interface
*/
struct nand_bch_priv {
@@ -262,105 +218,63 @@ static __maybe_unused struct nand_bch_priv bch_priv = {
};
/*
- * omap_hwecc_init_bch - Initialize the BCH Hardware ECC for NAND flash in
- * GPMC controller
+ * omap_enable_hwecc - configures GPMC as per ECC scheme before read/write
* @mtd: MTD device structure
* @mode: Read/Write mode
*/
__maybe_unused
-static void omap_hwecc_init_bch(struct nand_chip *chip, int32_t mode)
+static void omap_enable_hwecc(struct mtd_info *mtd, int32_t mode)
{
- uint32_t val;
- uint32_t dev_width = (chip->options & NAND_BUSWIDTH_16) >> 1;
-#if defined(CONFIG_NAND_OMAP_ECC_BCH8_CODE_HW)
- uint32_t unused_length = 0;
-#endif
- uint32_t wr_mode = BCH_WRAPMODE_6;
- struct nand_bch_priv *bch = chip->priv;
-
- /* Clear the ecc result registers, select ecc reg as 1 */
- writel(ECCCLEAR | ECCRESULTREG1, &gpmc_cfg->ecc_control);
-
-#if defined(CONFIG_NAND_OMAP_ECC_BCH8_CODE_HW)
- wr_mode = BCH_WRAPMODE_1;
-
- switch (bch->nibbles) {
- case ECC_BCH4_NIBBLES:
- unused_length = 3;
- break;
- case ECC_BCH8_NIBBLES:
- unused_length = 2;
- break;
- case ECC_BCH16_NIBBLES:
- unused_length = 0;
- break;
- }
-
- /*
- * This is ecc_size_config for ELM mode.
- * Here we are using different settings for read and write access and
- * also depending on BCH strength.
- */
- switch (mode) {
- case NAND_ECC_WRITE:
- /* write access only setup eccsize1 config */
- val = ((unused_length + bch->nibbles) << 22);
- break;
-
- case NAND_ECC_READ:
- default:
- /*
- * by default eccsize0 selected for ecc1resultsize
- * eccsize0 config.
- */
- val = (bch->nibbles << 12);
- /* eccsize1 config */
- val |= (unused_length << 22);
- break;
- }
+ struct nand_chip *chip = mtd->priv;
+ unsigned int dev_width = (chip->options & NAND_BUSWIDTH_16) ? 1 : 0;
+ unsigned int ecc_algo = 0;
+ unsigned int bch_type = 0;
+ unsigned int eccsize1 = 0x00, eccsize0 = 0x00, bch_wrapmode = 0x00;
+ u32 ecc_size_config_val = 0;
+ u32 ecc_config_val = 0;
+
+ if (chip->ecc.strength == 1) {
+ ecc_algo = 0x0;
+ bch_type = 0x0;
+ bch_wrapmode = 0x00;
+ eccsize0 = 0xFF;
+ eccsize1 = 0xFF;
+#if defined(CONFIG_NAND_OMAP_ECC_BCH8_CODE_HW) || \
+ defined(CONFIG_NAND_OMAP_ECC_BCH8_CODE_HW_DETECTION_SW)
+ } else if (chip->ecc.strength == 8) {
+ ecc_algo = 0x1;
+ bch_type = 0x1;
+ if (mode == NAND_ECC_WRITE) {
+ bch_wrapmode = 0x01;
+ eccsize0 = 0; /* extra bits in nibbles per sector */
+ eccsize1 = 28; /* OOB bits in nibbles per sector */
+ } else {
+ bch_wrapmode = 0x01;
+ eccsize0 = 26; /* ECC bits in nibbles per sector */
+ eccsize1 = 2; /* non-ECC bits in nibbles per sector */
+ }
#else
- /*
- * This ecc_size_config setting is for BCH sw library.
- *
- * Note: we only support BCH8 currently with BCH sw library!
- * Should be really easy to adobt to BCH4, however some omap3 have
- * flaws with BCH4.
- *
- * Here we are using wrapping mode 6 both for reading and writing, with:
- * size0 = 0 (no additional protected byte in spare area)
- * size1 = 32 (skip 32 nibbles = 16 bytes per sector in spare area)
- */
- val = (32 << 22) | (0 << 12);
+ } else {
+ printf("*Error: invalid driver configuration\n");
#endif
- /* ecc size configuration */
- writel(val, &gpmc_cfg->ecc_size_config);
-
- /*
- * Configure the ecc engine in gpmc
- * We assume 512 Byte sector pages for access to NAND.
- */
- val = (1 << 16); /* enable BCH mode */
- val |= (bch->type << 12); /* setup BCH type */
- val |= (wr_mode << 8); /* setup wrapping mode */
- val |= (dev_width << 7); /* setup device width (16 or 8 bit) */
- val |= (cs << 1); /* setup chip select to work on */
- debug("set ECC_CONFIG=0x%08x\n", val);
- writel(val, &gpmc_cfg->ecc_config);
-}
-
-/*
- * omap_enable_ecc_bch - This function enables the bch h/w ecc functionality
- * @mtd: MTD device structure
- * @mode: Read/Write mode
- */
-__maybe_unused
-static void omap_enable_ecc_bch(struct mtd_info *mtd, int32_t mode)
-{
- struct nand_chip *chip = mtd->priv;
-
- omap_hwecc_init_bch(chip, mode);
- /* enable ecc */
- writel((readl(&gpmc_cfg->ecc_config) | 0x1), &gpmc_cfg->ecc_config);
+ }
+ /* Clear ecc and enable bits */
+ writel(ECCCLEAR | ECCRESULTREG1, &gpmc_cfg->ecc_control);
+ /* Configure ecc size for BCH */
+ ecc_size_config_val = (eccsize1 << 22) | (eccsize0 << 12);
+ writel(ecc_size_config_val, &gpmc_cfg->ecc_size_config);
+
+ /* Configure device details for BCH engine */
+ ecc_config_val = ((ecc_algo << 16) | /* HAM1 | BCHx */
+ (bch_type << 12) | /* BCH4/BCH8/BCH16 */
+ (bch_wrapmode << 8) | /* wrap mode */
+ (dev_width << 7) | /* bus width */
+ (0x0 << 4) | /* number of sectors */
+ (cs << 1) | /* ECC CS */
+ (0x0)); /* disable ECC */
+ writel(ecc_config_val, &gpmc_cfg->ecc_config);
+ /* enable ECC engine */
+ writel(ecc_config_val | 0x1, &gpmc_cfg->ecc_config);
}
/*
@@ -801,7 +715,7 @@ void omap_nand_switch_ecc(uint32_t hardware, uint32_t
eccstrength)
nand->ecc.hwctl = omap_enable_hwecc;
nand->ecc.correct = omap_correct_data;
nand->ecc.calculate = omap_calculate_ecc;
- omap_hwecc_init(nand);
+ omap_enable_hwecc(mtd, NAND_ECC_READ);
printf("1-bit hamming HW ECC selected\n");
} else if (eccstrength == 8) {
#if defined(CONFIG_NAND_OMAP_ECC_BCH8_CODE_HW)
@@ -810,13 +724,12 @@ void omap_nand_switch_ecc(uint32_t hardware, uint32_t
eccstrength)
nand->ecc.size = 512;
nand->ecc.bytes = 14;
nand->ecc.read_page = omap_read_page_bch;
- nand->ecc.hwctl = omap_enable_ecc_bch;
+ nand->ecc.hwctl = omap_enable_hwecc;
nand->ecc.correct = omap_correct_data_bch;
nand->ecc.calculate = omap_calculate_ecc_bch;
/* ELM is used for ECC error detection */
elm_init();
nand->priv = &bch_priv;
- omap_hwecc_init_bch(nand, NAND_ECC_READ);
printf("using OMAP_ECC_BCH8_CODE_HW\n");
#elif defined(CONFIG_NAND_OMAP_ECC_BCH8_CODE_HW_DETECTION_SW) && \
defined(CONFIG_BCH)
@@ -824,7 +737,7 @@ void omap_nand_switch_ecc(uint32_t hardware, uint32_t
eccstrength)
nand->ecc.layout = &hw_bch8_nand_oob;
nand->ecc.size = 512;
nand->ecc.bytes = 13;
- nand->ecc.hwctl = omap_enable_ecc_bch;
+ nand->ecc.hwctl = omap_enable_hwecc;
nand->ecc.correct = omap_correct_data_bch;
nand->ecc.calculate = omap_calculate_ecc_bch;
/* BCH SW library is used for error detection */
@@ -834,7 +747,6 @@ void omap_nand_switch_ecc(uint32_t hardware, uint32_t
eccstrength)
return -ENODEV;
}
nand->priv = &bch_priv;
- omap_hwecc_init_bch(nand, NAND_ECC_READ);
printf("using OMAP_ECC_BCH8_CODE_HW_DETECTION_SW\n");
#else
printf("selected ECC not supported or not enabled\n");
@@ -919,14 +831,13 @@ int board_nand_init(struct nand_chip *nand)
nand->ecc.size = CONFIG_SYS_NAND_ECCSIZE;
nand->ecc.bytes = CONFIG_SYS_NAND_ECCBYTES;
nand->ecc.strength = 8;
- nand->ecc.hwctl = omap_enable_ecc_bch;
+ nand->ecc.hwctl = omap_enable_hwecc;
nand->ecc.correct = omap_correct_data_bch;
nand->ecc.calculate = omap_calculate_ecc_bch;
nand->ecc.read_page = omap_read_page_bch;
/* ELM is used for ECC error detection */
elm_init();
nand->priv = &bch_priv;
- omap_hwecc_init_bch(nand, NAND_ECC_READ);
#elif defined(CONFIG_NAND_OMAP_ECC_BCH8_CODE_HW_DETECTION_SW) && \
defined(CONFIG_BCH)
printf("NAND: using OMAP_ECC_BCH8_CODE_HW_DETECTION_SW\n");
@@ -935,7 +846,7 @@ int board_nand_init(struct nand_chip *nand)
nand->ecc.size = CONFIG_SYS_NAND_ECCSIZE;
nand->ecc.bytes = CONFIG_SYS_NAND_ECCBYTES;
nand->ecc.strength = 8;
- nand->ecc.hwctl = omap_enable_ecc_bch;
+ nand->ecc.hwctl = omap_enable_hwecc;
nand->ecc.correct = omap_correct_data_bch;
nand->ecc.calculate = omap_calculate_ecc_bch;
/* BCH SW library is used for error detection */
@@ -945,7 +856,6 @@ int board_nand_init(struct nand_chip *nand)
return -ENODEV;
}
nand->priv = &bch_priv;
- omap_hwecc_init_bch(nand, NAND_ECC_READ);
#elif !defined(CONFIG_SPL_BUILD) || defined(CONFIG_SPL_NAND_SOFTECC)
printf("NAND: using OMAP_ECC_HAM1_CODE_SW\n");
nand->ecc.mode = NAND_ECC_SOFT;
@@ -959,7 +869,6 @@ int board_nand_init(struct nand_chip *nand)
nand->ecc.correct = omap_correct_data;
nand->ecc.calculate = omap_calculate_ecc;
nand->ecc.strength = 1;
- omap_hwecc_init(nand);
#endif
#ifdef CONFIG_SPL_BUILD
--
1.8.1
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