Add buffer reading code, should make the IO a little faster.
Signed-off-by: Marek Vasut <ma...@denx.de>
Cc: Kyungmin Park <kyungmin.p...@samsung.com>
Cc: Lukasz Majewski <l.majew...@samsung.com>
Cc: Minkyu Kang <mk7.k...@samsung.com>
Cc: Scott Wood <scottw...@freescale.com>
Cc: Vladimir Zapolskiy <v...@mleia.com>
---
drivers/mtd/nand/s3c2410_nand.c | 37 +++++++++++++++++++++++++++++++++++++
1 file changed, 37 insertions(+)
diff --git a/drivers/mtd/nand/s3c2410_nand.c b/drivers/mtd/nand/s3c2410_nand.c
index 4971342..91db6ca 100644
--- a/drivers/mtd/nand/s3c2410_nand.c
+++ b/drivers/mtd/nand/s3c2410_nand.c
@@ -10,6 +10,7 @@
#include <nand.h>
#include <asm/arch/s3c24x0_cpu.h>
#include <asm/io.h>
+#include <asm/unaligned.h>
#define S3C2410_NFCONF_EN (1<<15)
#define S3C2440_NFCONT_EN (1<<0)
@@ -45,6 +46,39 @@ static void nand_read_buf(struct mtd_info *mtd, u_char *buf,
int len)
for (i = 0; i < len; i++)
buf[i] = readb(this->IO_ADDR_R);
}
+#elif !defined(CONFIG_S3C2410)
+static void s3c2440_read_buf(struct mtd_info *mtd, u_char *buf, int len)
+{
+ struct s3c24x0_nand *nand = s3c24x0_get_base_nand();
+ uint32_t data;
+
+ while (len >= 4) {
+ data = readl(&nand->nfdata);
+ put_unaligned_le32(data, buf);
+ buf += 4;
+ len -= 4;
+ }
+
+ for (; len & 3; len--)
+ *buf++ = readb(&nand->nfdata);
+}
+
+static void s3c2440_write_buf(struct mtd_info *mtd, const u_char *buf,
+ int len)
+{
+ struct s3c24x0_nand *nand = s3c24x0_get_base_nand();
+ uint32_t data;
+
+ while (len >= 4) {
+ data = get_unaligned_le32(buf);
+ writel(data, &nand->nfdata);
+ buf += 4;
+ len -= 4;
+ }
+
+ for (; len & 3; len--, buf++)
+ writeb(*buf, &nand->nfdata);
+}
#endif
static void s3c24x0_hwcontrol(struct mtd_info *mtd, int cmd, unsigned int ctrl)
@@ -177,6 +211,9 @@ int board_nand_init(struct nand_chip *nand)
/* read_byte and write_byte are default */
#ifdef CONFIG_NAND_SPL
nand->read_buf = nand_read_buf;
+#elif !defined(CONFIG_S3C2410)
+ nand->read_buf = s3c2440_read_buf;
+ nand->write_buf = s3c2440_write_buf;
#endif
/* hwcontrol always must be implemented */
--
2.1.1
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