[RFC PATCH 09/10] mtd: nand: omap: Use GPMC APIs for accessing ECC/BCH engine
From: Roger Quadros
Date: Wed Jul 09 2014 - 08:39:07 EST
Don't access the ECC/BCH engine registers directly as they belong
to the GPMC controller's register space. Use the relevant
GPMC APIs instead.
Signed-off-by: Roger Quadros <rogerq@xxxxxx>
---
drivers/mtd/nand/omap2.c | 191 +++++++++++++++++++----------------------------
1 file changed, 76 insertions(+), 115 deletions(-)
diff --git a/drivers/mtd/nand/omap2.c b/drivers/mtd/nand/omap2.c
index 420ef0b..6b0f953 100644
--- a/drivers/mtd/nand/omap2.c
+++ b/drivers/mtd/nand/omap2.c
@@ -865,16 +865,10 @@ static int omap_correct_data(struct mtd_info *mtd, u_char *dat,
static int omap_calculate_ecc(struct mtd_info *mtd, const u_char *dat,
u_char *ecc_code)
{
- struct omap_nand_info *info = container_of(mtd, struct omap_nand_info,
- mtd);
u32 val;
- val = readl(info->reg.gpmc_ecc_config);
- if (((val >> ECC_CONFIG_CS_SHIFT) & ~CS_MASK) != info->gpmc_cs)
- return -EINVAL;
-
/* read ecc result */
- val = readl(info->reg.gpmc_ecc1_result);
+ omap_gpmc_ecc_get_result(1, &val);
*ecc_code++ = val; /* P128e, ..., P1e */
*ecc_code++ = val >> 16; /* P128o, ..., P1o */
/* P2048o, P1024o, P512o, P256o, P2048e, P1024e, P512e, P256e */
@@ -894,34 +888,22 @@ static void omap_enable_hwecc(struct mtd_info *mtd, int mode)
mtd);
struct nand_chip *chip = mtd->priv;
unsigned int dev_width = (chip->options & NAND_BUSWIDTH_16) ? 1 : 0;
- u32 val;
-
- /* clear ecc and enable bits */
- val = ECCCLEAR | ECC1;
- writel(val, info->reg.gpmc_ecc_control);
+ u32 ecc_size0;
- /* program ecc and result sizes */
- val = ((((info->nand.ecc.size >> 1) - 1) << ECCSIZE1_SHIFT) |
- ECC1RESULTSIZE);
- writel(val, info->reg.gpmc_ecc_size_config);
+ ecc_size0 = (info->nand.ecc.size >> 1) - 1;
switch (mode) {
case NAND_ECC_READ:
case NAND_ECC_WRITE:
- writel(ECCCLEAR | ECC1, info->reg.gpmc_ecc_control);
+ omap_gpmc_ecc_configure_enable(info->gpmc_cs, dev_width,
+ ecc_size0, 0, false,
+ 0, 0, 0);
break;
case NAND_ECC_READSYN:
- writel(ECCCLEAR, info->reg.gpmc_ecc_control);
- break;
- default:
- dev_info(&info->pdev->dev,
- "error: unrecognized Mode[%d]!\n", mode);
+ /* Disable the engine, but don't clear ECC results */
+ omap_gpmc_ecc_disable();
break;
}
-
- /* (ECC 16 or 8 bit col) | ( CS ) | ECC Enable */
- val = (dev_width << 7) | (info->gpmc_cs << 1) | (0x1);
- writel(val, info->reg.gpmc_ecc_config);
}
/**
@@ -993,20 +975,20 @@ static int omap_dev_ready(struct mtd_info *mtd)
*/
static void __maybe_unused omap_enable_hwecc_bch(struct mtd_info *mtd, int mode)
{
- unsigned int bch_type;
+ enum omap_gpmc_bch_type bch_type;
unsigned int dev_width, nsectors;
struct omap_nand_info *info = container_of(mtd, struct omap_nand_info,
mtd);
enum omap_ecc ecc_opt = info->ecc_opt;
struct nand_chip *chip = mtd->priv;
- u32 val, wr_mode;
+ u32 wr_mode;
unsigned int ecc_size1, ecc_size0;
/* GPMC configurations for calculating ECC */
nsectors = chip->ecc.steps;
switch (ecc_opt) {
case OMAP_ECC_BCH4_CODE_HW_DETECTION_SW:
- bch_type = 0;
+ bch_type = OMAP_GPMC_BCH4;
if (mode == NAND_ECC_READ) {
wr_mode = BCH_WRAPMODE_6;
ecc_size0 = BCH_ECC_SIZE0;
@@ -1018,7 +1000,7 @@ static void __maybe_unused omap_enable_hwecc_bch(struct mtd_info *mtd, int mode)
}
break;
case OMAP_ECC_BCH4_CODE_HW:
- bch_type = 0;
+ bch_type = OMAP_GPMC_BCH4;
if (mode == NAND_ECC_READ) {
wr_mode = BCH_WRAPMODE_1;
ecc_size0 = BCH4R_ECC_SIZE0;
@@ -1030,7 +1012,7 @@ static void __maybe_unused omap_enable_hwecc_bch(struct mtd_info *mtd, int mode)
}
break;
case OMAP_ECC_BCH8_CODE_HW_DETECTION_SW:
- bch_type = 1;
+ bch_type = OMAP_GPMC_BCH8;
if (mode == NAND_ECC_READ) {
wr_mode = BCH_WRAPMODE_6;
ecc_size0 = BCH_ECC_SIZE0;
@@ -1042,7 +1024,7 @@ static void __maybe_unused omap_enable_hwecc_bch(struct mtd_info *mtd, int mode)
}
break;
case OMAP_ECC_BCH8_CODE_HW:
- bch_type = 1;
+ bch_type = OMAP_GPMC_BCH8;
if (mode == NAND_ECC_READ) {
wr_mode = BCH_WRAPMODE_1;
ecc_size0 = BCH8R_ECC_SIZE0;
@@ -1054,7 +1036,7 @@ static void __maybe_unused omap_enable_hwecc_bch(struct mtd_info *mtd, int mode)
}
break;
case OMAP_ECC_BCH16_CODE_HW:
- bch_type = 0x2;
+ bch_type = OMAP_GPMC_BCH16;
if (mode == NAND_ECC_READ) {
wr_mode = 0x01;
ecc_size0 = 52; /* ECC bits in nibbles per sector */
@@ -1069,27 +1051,11 @@ static void __maybe_unused omap_enable_hwecc_bch(struct mtd_info *mtd, int mode)
return;
}
- writel(ECC1, info->reg.gpmc_ecc_control);
-
- /* Configure ecc size for BCH */
- val = (ecc_size1 << ECCSIZE1_SHIFT) | (ecc_size0 << ECCSIZE0_SHIFT);
- writel(val, info->reg.gpmc_ecc_size_config);
-
dev_width = (chip->options & NAND_BUSWIDTH_16) ? 1 : 0;
- /* BCH configuration */
- val = ((1 << 16) | /* enable BCH */
- (bch_type << 12) | /* BCH4/BCH8/BCH16 */
- (wr_mode << 8) | /* wrap mode */
- (dev_width << 7) | /* bus width */
- (((nsectors-1) & 0x7) << 4) | /* number of sectors */
- (info->gpmc_cs << 1) | /* ECC CS */
- (0x1)); /* enable ECC */
-
- writel(val, info->reg.gpmc_ecc_config);
-
- /* Clear ecc and enable bits */
- writel(ECCCLEAR | ECC1, info->reg.gpmc_ecc_control);
+ omap_gpmc_ecc_configure_enable(info->gpmc_cs, dev_width,
+ ecc_size0, ecc_size1, true,
+ bch_type, nsectors - 1, wr_mode);
}
static u8 bch4_polynomial[] = {0x28, 0x13, 0xcc, 0x39, 0x96, 0xac, 0x7f};
@@ -1111,11 +1077,10 @@ static int __maybe_unused omap_calculate_ecc_bch(struct mtd_info *mtd,
mtd);
struct nand_chip *chip = mtd->priv;
int eccbytes = info->nand.ecc.bytes;
- struct gpmc_nand_regs *gpmc_regs = &info->reg;
u8 *ecc_code;
- unsigned long nsectors, bch_val1, bch_val2, bch_val3, bch_val4;
- u32 val;
+ unsigned long nsectors;
int i, j;
+ u32 bch_val[7];
nsectors = chip->ecc.steps;
for (i = 0; i < nsectors; i++) {
@@ -1123,71 +1088,67 @@ static int __maybe_unused omap_calculate_ecc_bch(struct mtd_info *mtd,
switch (info->ecc_opt) {
case OMAP_ECC_BCH8_CODE_HW_DETECTION_SW:
case OMAP_ECC_BCH8_CODE_HW:
- bch_val1 = readl(gpmc_regs->gpmc_bch_result0[i]);
- bch_val2 = readl(gpmc_regs->gpmc_bch_result1[i]);
- bch_val3 = readl(gpmc_regs->gpmc_bch_result2[i]);
- bch_val4 = readl(gpmc_regs->gpmc_bch_result3[i]);
- *ecc_code++ = (bch_val4 & 0xFF);
- *ecc_code++ = ((bch_val3 >> 24) & 0xFF);
- *ecc_code++ = ((bch_val3 >> 16) & 0xFF);
- *ecc_code++ = ((bch_val3 >> 8) & 0xFF);
- *ecc_code++ = (bch_val3 & 0xFF);
- *ecc_code++ = ((bch_val2 >> 24) & 0xFF);
- *ecc_code++ = ((bch_val2 >> 16) & 0xFF);
- *ecc_code++ = ((bch_val2 >> 8) & 0xFF);
- *ecc_code++ = (bch_val2 & 0xFF);
- *ecc_code++ = ((bch_val1 >> 24) & 0xFF);
- *ecc_code++ = ((bch_val1 >> 16) & 0xFF);
- *ecc_code++ = ((bch_val1 >> 8) & 0xFF);
- *ecc_code++ = (bch_val1 & 0xFF);
+ omap_gpmc_ecc_get_bch_result(4, i, bch_val);
+ *ecc_code++ = (bch_val[3] & 0xFF);
+ *ecc_code++ = ((bch_val[2] >> 24) & 0xFF);
+ *ecc_code++ = ((bch_val[2] >> 16) & 0xFF);
+ *ecc_code++ = ((bch_val[2] >> 8) & 0xFF);
+ *ecc_code++ = (bch_val[2] & 0xFF);
+ *ecc_code++ = ((bch_val[1] >> 24) & 0xFF);
+ *ecc_code++ = ((bch_val[1] >> 16) & 0xFF);
+ *ecc_code++ = ((bch_val[1] >> 8) & 0xFF);
+ *ecc_code++ = (bch_val[1] & 0xFF);
+ *ecc_code++ = ((bch_val[0] >> 24) & 0xFF);
+ *ecc_code++ = ((bch_val[0] >> 16) & 0xFF);
+ *ecc_code++ = ((bch_val[0] >> 8) & 0xFF);
+ *ecc_code++ = (bch_val[0] & 0xFF);
break;
case OMAP_ECC_BCH4_CODE_HW_DETECTION_SW:
case OMAP_ECC_BCH4_CODE_HW:
- bch_val1 = readl(gpmc_regs->gpmc_bch_result0[i]);
- bch_val2 = readl(gpmc_regs->gpmc_bch_result1[i]);
- *ecc_code++ = ((bch_val2 >> 12) & 0xFF);
- *ecc_code++ = ((bch_val2 >> 4) & 0xFF);
- *ecc_code++ = ((bch_val2 & 0xF) << 4) |
- ((bch_val1 >> 28) & 0xF);
- *ecc_code++ = ((bch_val1 >> 20) & 0xFF);
- *ecc_code++ = ((bch_val1 >> 12) & 0xFF);
- *ecc_code++ = ((bch_val1 >> 4) & 0xFF);
- *ecc_code++ = ((bch_val1 & 0xF) << 4);
+ omap_gpmc_ecc_get_bch_result(2, i, bch_val);
+ *ecc_code++ = ((bch_val[1] >> 12) & 0xFF);
+ *ecc_code++ = ((bch_val[1] >> 4) & 0xFF);
+ *ecc_code++ = ((bch_val[1] & 0xF) << 4) |
+ ((bch_val[0] >> 28) & 0xF);
+ *ecc_code++ = ((bch_val[0] >> 20) & 0xFF);
+ *ecc_code++ = ((bch_val[0] >> 12) & 0xFF);
+ *ecc_code++ = ((bch_val[0] >> 4) & 0xFF);
+ *ecc_code++ = ((bch_val[0] & 0xF) << 4);
break;
case OMAP_ECC_BCH16_CODE_HW:
- val = readl(gpmc_regs->gpmc_bch_result6[i]);
- ecc_code[0] = ((val >> 8) & 0xFF);
- ecc_code[1] = ((val >> 0) & 0xFF);
- val = readl(gpmc_regs->gpmc_bch_result5[i]);
- ecc_code[2] = ((val >> 24) & 0xFF);
- ecc_code[3] = ((val >> 16) & 0xFF);
- ecc_code[4] = ((val >> 8) & 0xFF);
- ecc_code[5] = ((val >> 0) & 0xFF);
- val = readl(gpmc_regs->gpmc_bch_result4[i]);
- ecc_code[6] = ((val >> 24) & 0xFF);
- ecc_code[7] = ((val >> 16) & 0xFF);
- ecc_code[8] = ((val >> 8) & 0xFF);
- ecc_code[9] = ((val >> 0) & 0xFF);
- val = readl(gpmc_regs->gpmc_bch_result3[i]);
- ecc_code[10] = ((val >> 24) & 0xFF);
- ecc_code[11] = ((val >> 16) & 0xFF);
- ecc_code[12] = ((val >> 8) & 0xFF);
- ecc_code[13] = ((val >> 0) & 0xFF);
- val = readl(gpmc_regs->gpmc_bch_result2[i]);
- ecc_code[14] = ((val >> 24) & 0xFF);
- ecc_code[15] = ((val >> 16) & 0xFF);
- ecc_code[16] = ((val >> 8) & 0xFF);
- ecc_code[17] = ((val >> 0) & 0xFF);
- val = readl(gpmc_regs->gpmc_bch_result1[i]);
- ecc_code[18] = ((val >> 24) & 0xFF);
- ecc_code[19] = ((val >> 16) & 0xFF);
- ecc_code[20] = ((val >> 8) & 0xFF);
- ecc_code[21] = ((val >> 0) & 0xFF);
- val = readl(gpmc_regs->gpmc_bch_result0[i]);
- ecc_code[22] = ((val >> 24) & 0xFF);
- ecc_code[23] = ((val >> 16) & 0xFF);
- ecc_code[24] = ((val >> 8) & 0xFF);
- ecc_code[25] = ((val >> 0) & 0xFF);
+ omap_gpmc_ecc_get_bch_result(7, i, bch_val);
+ ecc_code[0] = ((bch_val[6] >> 8) & 0xFF);
+ ecc_code[1] = ((bch_val[6] >> 0) & 0xFF);
+
+ ecc_code[2] = ((bch_val[5] >> 24) & 0xFF);
+ ecc_code[3] = ((bch_val[5] >> 16) & 0xFF);
+ ecc_code[4] = ((bch_val[5] >> 8) & 0xFF);
+ ecc_code[5] = ((bch_val[5] >> 0) & 0xFF);
+
+ ecc_code[6] = ((bch_val[4] >> 24) & 0xFF);
+ ecc_code[7] = ((bch_val[4] >> 16) & 0xFF);
+ ecc_code[8] = ((bch_val[4] >> 8) & 0xFF);
+ ecc_code[9] = ((bch_val[4] >> 0) & 0xFF);
+
+ ecc_code[10] = ((bch_val[3] >> 24) & 0xFF);
+ ecc_code[11] = ((bch_val[3] >> 16) & 0xFF);
+ ecc_code[12] = ((bch_val[3] >> 8) & 0xFF);
+ ecc_code[13] = ((bch_val[3] >> 0) & 0xFF);
+
+ ecc_code[14] = ((bch_val[2] >> 24) & 0xFF);
+ ecc_code[15] = ((bch_val[2] >> 16) & 0xFF);
+ ecc_code[16] = ((bch_val[2] >> 8) & 0xFF);
+ ecc_code[17] = ((bch_val[2] >> 0) & 0xFF);
+
+ ecc_code[18] = ((bch_val[1] >> 24) & 0xFF);
+ ecc_code[19] = ((bch_val[1] >> 16) & 0xFF);
+ ecc_code[20] = ((bch_val[1] >> 8) & 0xFF);
+ ecc_code[21] = ((bch_val[1] >> 0) & 0xFF);
+
+ ecc_code[22] = ((bch_val[0] >> 24) & 0xFF);
+ ecc_code[23] = ((bch_val[0] >> 16) & 0xFF);
+ ecc_code[24] = ((bch_val[0] >> 8) & 0xFF);
+ ecc_code[25] = ((bch_val[0] >> 0) & 0xFF);
break;
default:
return -EINVAL;
--
1.8.3.2
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